The septic tank is a watertight vault in which the purification process begins. In the tank, density differences automatically separates the sewage into three layers. The topmost layer is called “scum”. Scum is composed of materials that float on water such as grease, oil, and fats.
- What is a Septic Tank Crust or Scum Layer? On the septic tank surface is a light layer that will normally (and should) float to the top. This tends to contain some fats, oils and greases, and it’s generally a pretty clear greeny, greyish even brown bubbly liquid.
How do you stop a scum layer on a septic tank?
How to Reduce Sludge in a Septic Tank Without Pumping
- Install an aeration system with diffused air in your septic tank.
- Break up any compacted sludge.
- Add a bio-activator or microbe blend.
- Maintain the aeration system.
- Add additional Microbes as required.
What are the 3 layers in a septic tank?
The contents of the septic tank stratify into three layers: • Floating Scum Layer – soaps, greases, toilet paper, etc. Liquid layer – water, other liquids, and suspended solids • Sludge – heavy organic and inorganic materials settle to the bottom of the tank.
How much scum is normal in a septic tank?
“Generally at a two year interval for septic tank pumping service the average septic tank in these size ranges will have a 400 mm scum layer with about a 200 mm sludge layer. With an average depth of 1600 mm, the solids content is about 600 mm thereby reducing the settling time by nearly 40%.
What are the layers in a septic tank?
Septic tank – Household waste receives primary treatment in the septic tank, an anaerobic environment, and separates into 3 layers; a sludge layer, a clear zone, and a scum layer. Solids heavier than water settle on the bottom to form the sludge later.
How do u know when your septic tank is full?
Here are some of the most common warning signs that you have a full septic tank:
- Your Drains Are Taking Forever.
- Standing Water Over Your Septic Tank.
- Bad Smells Coming From Your Yard.
- You Hear Gurgling Water.
- You Have A Sewage Backup.
- How often should you empty your septic tank?
Why is my septic tank foaming?
Phosphates that pass through the septic system due to improper design can enter surface water, causing very high growth rates of algae. Surfactants typically cause foaming or suds in water.
What floats on top of septic tank?
Heavy solids, such as dirt and digested waste, will sink to the bottom of the tank to form the sludge layer. Meanwhile, solids that are lighter than water, such as grease, hair, and toilet paper, will float to the top to form the scum layer.
What causes sludge in septic tank?
Septic sludge is normal for any septic tank. The aerobic bacteria aren’t able to decompose every solid waste that enters the system. This leads to layers of sludge on the tank floor. Septic waste clogging the drain field prevents water from draining into the soil and filtering naturally.
How do I check my septic tanks sludge level?
To measure the sludge layer:
- Slowly lower the tube into the septic tank until it touches the bottom of the tank.
- As the device is slowly pulled out of the water, the check valve closes capturing a liquid/solid profile of the septic tank water. The thickness of the sludge layer can be measured.
How thick should scum layer be?
A scum layer should be present, although depending on practices within the home or facility it may be a thin zone of an inch or less, or could be thicker. Items to evaluate are discussed below. 1.
What happens to scum in a septic tank?
Through the normal metabolic activities of these resident bacteria, liquification of the scum and sludge layers occur. In other words, when operating properly bacteria cause organic materials from both the sludge and scum layers to be broken down into smaller sized substances.
How to Measure Septic Tank Floating Scum Thickness
- Post a QUESTION or COMMENTabout how, when, where, and why to measure the thickness of the scum layer in a septic tank in the comments section. what the thickness of the tank signifies in terms of tank condition the requirement for pumping
InspectAPedia does not allow any form of conflict of interest. The sponsors, goods, and services described on this website are not affiliated with us in any way. Measurement of the thickness of the floating scum layer in a septic tank: A septic tank condition assessment tool and technique are described in this paper, which may be used to determine the thickness of the floating scum layer in a septic tank as an assistance in assessing whether or not the septic tank should be pumped and thoroughly cleaned.
Pumping and checking your septic tank is an important part of septic tank maintenance and septic system maintenance, regardless of whether you have a traditional septic tank and drain field or soakaway bed, an above ground septic system, or even a sewage holding tank.
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How to Measure theScum layer thickness in a septic tank:How to measure the thickness of the floating scum layer in a septic tank
When the septic tank is pumped, measurements of the scum layer and the sludge layer provide information on the system’s condition and effectiveness. The steps in this approach are designed after the steps in the classes that are required to get a Massachusetts Title 5 Septic Inspectors License. Other governments and agencies, on the other hand, describe a method that is comparable. Some septic companies have constructed their own versions of the equipment detailed below, which they transport to the pumpout work.
The septic tank drawing at the top of the page is courtesy of Carson Dunlop Associates.
This information allows the home owner to know whether the septic tank is in good condition.
- When the septic tank is being pumped, and how often it is being pumped Whether or whether there is proof that the septic fields have been harmed as a result of the failure to pump the tank in a timely manner
If the septic tank is being pumped often enough, or not. What proof, if any, exists that the septic fields have been harmed as a result of the failure to pump the tank promptly;
How to Make the septic tank probe for measuring scumsludge layer thickness
An example of the type of septic tank scum and sludge measuring instrument displayed here is one that is used by a septic contractor to probe the thickness of the tank scum and sludge layers in the tank. A board measuring 6×6″ to 6×8″ is connected to the end of a pole of (about) 8 feet in length. Poly piping in the size of 2″ is ideal for this application since it is easy to clean up after. A basic door hinge is fastened to the end of the pipe as well as to the flapper board to complete the installation.
(See the graphic above for further information.) In addition, seeTUBE for MEASURING SCUMSLUDGEfor a tool that can measure the thickness of both scum and sludge with a single instrument.
- Open the septic tank access port. If the tank is a single compartment septic tank (as seen on the left by the USDA sketch), this examination should be performed at the tank outlet end since it is at this point that the danger of discharge into the absorption system is the greatest. Some tanks, on the other hand, have a ready access port just on the inlet side – which is less preferable, but you may look there as well. You should be aware that if your tank has two compartments, solids, floating scum and settled sludge are building at the entrance area of the tank, which should be avoided. Sludge and scum will not be discovered in time to avoid septic system damage if the inspection is performed at the final septic tank outflow end. Such tanks may be equipped with a center inspection port, which allows for tank access at the outflow of the sludge/scum holding compartment when the tank is in the middle of the tank. In two-compartment septic tanks, here is where the testing should take place. Insert the septic tank measurement instrument as follows: Probe with the flapper pole into the scum layer at the opening septic tank access port until you feel an output baffle or a hygienic tee, then close the access hole. As a result, the pole has been positioned so that the board will extend beneath the baffle and be able to feel the bottom of it. Make a mark on the pole (chalk or pencil would do) to indicate where you want to go. Using anything easily accessible, such as the top of an access port, we may line up the mark and use it as a standard reference point for the subsequent measurements. In order to feel resistance from the bottom of a floating scum layer, pull the flapper pole up a little bit. Mark the pole once more, this time using the same reference point as previously specified
- Distance between the scum and the baffle bottom: With the distance between the two markings, we can calculate the distance between the bottom of the scum layer and the (lower) bottom of the exit baffle. This indicates that the tank has to be emptied if the bottom of the scum layer is less than 3 inches above the bottom of the baffle. Distance between the scum and the baffle top: If, upon visual inspection, the top of the floating scum layer in the septic tank is within 1 inch of the top of the outflow baffle, the septic tank will also require pumping
- Otherwise, the septic tank will not require pumping.
A protocol for measuring sludgescum is described in Septic Tank/Soil-Absorption Systems: How to OperateMaintain-, Equipment Tips, published by the United States Department of Agriculture (USDA).
What is The floating scum layer in a septic tank
It is possible that oil and grease will accumulate in the floating scum layer of a septic tank and eventually clog the leach field, which is a component of the septic system. When it comes to septic effluent treatment in the soil absorption system, oil and grease are particularly damaging because they inhibit aerobic treatment. As a result, if the scum layer has developed to the point that it is threatening to force grease and oil out of the tank, we should consider cleaning the septic tank. When the floating scum layer has built to the point that it has reached 3 inches below the bottom of the exit baffle or tee, the septic tank should be flushed.
WHEN TO PUMP – 3 Rules on How thick can the septic tank sludge and scum layer be before septic tank cleaning is needed?
“What Scum Sludge Thickness = Pump Required” is the title of the book that contains the following passage. At a two-year period, the average septic tank in this size range will have a 400-mm scum layer with around 200-mm sludge layer, according to the American Septic Tank Pumping Association (ASTP). With an average depth of 1600 mm, the solids content is around 600 mm, resulting in a reduction in settling time of approximately 40%. According to the USDA, the following are examples of what amounts of sludge or scum indicate that the septic tank should be cleaned:
- Pump the septic tank when the entire depth of scum and sludge layers reaches one-third of the overall depth of the tank
- 1/3 of tank depth
- If there is less than three inches between the bottom of the scum layer and the bottom of the septic tank outlet baffle, pump the septic tank (the amount of clearance will vary depending on the length of your outlet baffle or tee)
- Less than three inches between scum layer and bottom of septic tank outlet baffle
- Pump the septic tank when the bottom of the outlet baffle is less than 6 inches from the top of the sludge layer found on the septic tank bottom
- Less than 6 inches from the top of the sludge layer found on the septic tank bottom
Keep an eye out for septic scum and sludge that has accumulated over an extended period of time. It is too late for people who wait until their septic system stops operating as a result of a blocked or over-full septic tank (which is packed with sludge and scum) to take action. As the thickness of the bottom sludge layer rises, and as the thickness of the top septic scum layer increases as well, the amount of effluent left in the tank (known as the “net free area” or “effective septic tank volume”) decreases.
Despite the fact that the drains in the building appear to be working well, the septic tank effluent remains in a continual state of stirred-agitation in this situation.
It is detrimental to the future life of the septic tank and leach field to remove oil, scum, and tiny solid debris from them and deposit them in the leach field.
an instrument that may be used to measure both scum and sludge thickness using a single piece of equipment For deep or difficult-to-access septic tanks, as well as commercial septic tanks that may require close monitoring, seeELECTRIC MONITOR FOR SCUMSLUDGEand also take a look atOther Measures Scum / Sludge for further options.
Septic Tank Sewage Level Articles
- PROCEDURE FOR SEPTIC TANK INSPECTION
- LEVELS OF SEWAGE IN SEPTIC TANK INSPECTION
- TIME FOR EFFLUENT TO RETENTION
- HOW TO MEASURE SEPTIC SCUM LAYER
- HOW TO MEASURE SEPTIC SLUDGE LAYER
- EFFLUENT RETENTION TIME
- Flooding of the SEPTIC TANK
- SCUMSLUDGE MEASUREMENT TOOLS
- And more.
. How to Measure Septic Sludge Layer (Continue Reading) Alternatively, choose a topic from the closely related articles listed below, or browse the entireARTICLE INDEX. Alternatives include TOOLS FOR MEASURING SCUMSLUDGE.
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INDEX to RELATED ARTICLES:ARTICLE INDEX to SEPTIC SYSTEMS
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What Are the Septic Tank Layers? – Septic Maxx
Millions of people in the United States still have septic tank systems linked to their residences. Do you understand how your septic system works, despite the fact that they are so common? Despite the fact that you may not be employed in the septic system sector, it is critical that you grasp the primary components of your septic system as well as its fundamental operations. Even a rudimentary grasp of how your wastewater system works may help you keep repairs to a minimum and extend the life of your wastewater system.
- Scum, sludge, and effluent are the three layers of wastewater that make up your septic tank: scum, sludge, and effluent.
- Spillage: Spillage is the solid material that accumulates at the bottom of your septic tank, forming an unsightly coating on top of the water.
- Anaerobic bacteria that grow at the bottom of your tank and feed off of the sludge layer can be found in the tank bottom.
- Scum is a term used to describe a collection of material found in a septic tank that are lighter than water.
- Most of the floating solid waste items float to the surface of the water, where aerobic bacteria begin to work, digesting the bulk of the floating solid waste materials.
- A large portion of the liquid in your septic tank is composed of this substance.
- In order for your septic system to work effectively, these layers must remain balanced and maintain an appropriate retention duration throughout time.
- In order for your tank to function effectively, it must have a minimum retention time of twenty-four hours.
- In most cases, clogged drainfields are the most prevalent reason for a sewage treatment system to fail.
- It is completely natural and has been particularly formulated to assist in replenishing the beneficial bacteria and protease in your tank in order to guarantee adequate drainage into your drainfields.
Please contact us soon at 800-397-2384 to take advantage of our free trial offer. We have a team of expert septic tank technicians available to assist you with any septic tank problems.
Should You be Concerned if a Septic System has No Scum Layer?
Get articles, news, and videos about Onsite Systems delivered directly to your email! Now is the time to sign up. Plus, there are Onsite Systems. Receive Notifications Septic tanks allow gravity to separate materials from wastewater because heavier particles settle while fats, grease, and other lighter solids float, allowing heavier solids to be removed from the wastewater. Particles removal in a septic tank is often thought of as occurring predominantly through settling, although separation of suspended solids by flotation is also extremely significant in the tank’s operation.
- The presence of fats, oils, and grease in the wastewater helps to improve the flotation process because they congeal on the surfaces of tiny particles, making them more buoyant and floatable in the water.
- After six months or more of usage, septic tanks should have established three layers: a scum layer on the surface, a cleared effluent layer in the center that is free of big particles, and a sludge layer at the bottom of the tank.
- A scum layer should be present, albeit it may be a thin zone of an inch or less in thickness, or it may be a bigger coating depending on the methods used within the house or facility.
- The effluent baffle’s aim is to ensure that the scum layer remains in the septic tank and should be replaced as soon as possible if it has been removed or has become inefficient.
- The design detention period for a septic tank should be lengthy enough to allow for appropriate suspended particles and oil/grease removal by sedimentation and flotation.
- Third, there should be little to no turbulence in the septic tank in order to allow settleable particles to build at the bottom and floatable solids to accumulate at the top.
In little, typical doses, they should not be an issue, but when used excessively, additives such as powerful phosphate-based cleansers, fabric softeners, and degreasers can have an adverse effect on scum development and cause it to build more quickly.
In addition, greater water temperatures and higher water flow rates aid in the mechanical emulsification of lubricating oils.
The influence of the microbial community – A healthy microbial community is required for the septic tank to function correctly.
This covers any product found in a house that has the ability to destroy microorganisms.
Ideally, the pH level should be in the range of 6-8, which is close to the pH of tap water.
Low pH levels are caused by acidic substances such as cleansers or furnace condensate, whilst high pH values are generated by basic substances such as basic cleaners or other chemicals.
This has been observed when regeneration water from water softeners enters septic tanks.
It may be possible to help by routing the recharge out of the system or by replacing outdated units that require much more salt.
When there is no scum layer, you should collaborate with the property owner to identify the potential causes of the problem and take steps to correct them in order to extend the life of downstream components.
She has presented at several local and national training events on topics such as the design, installation, and administration of septic systems, as well as research in the related field.
Email [email protected] with any questions on septic system design, installation, maintenance, and operation and Heger will respond as soon as possible!
Wastewater and the Septic System
What is a septic tank, and how does it work? All waste from toilets, showers, sinks, and washing machines is sent to a septic tank, which is connected to a septic system for the remaining 20% of American houses and institutions that do not have sewer connections. In the first treatment of wastewater by capturing particles and settleable organic matter before dumping of the wastewater (effluent) to the drainfield, a septic tank is a large-volume, waterproof tank. Construction and operation of the septic tank are relatively straightforward; nonetheless, via the intricate interplay of physical and biological processes, the tank serves a variety of vital purposes.
- The following are the most important functions of a septic tank: Take care of all of the wastewater generated by the residence or institution.
- Reduce the amount of solids that have collected and allow them to decompose.
- This reasonably calm body of water allows the wastewater to be kept for a long enough period of time to allow the particles to separate through a combination of settling and flotation processes.
- Scum: Substances that are lighter in weight than water (oil, grease, and fats) float to the surface of the water and produce a scum layer.
- Aerobic bacteria are actively engaged in the digestion of floating particles.
- Because sludge is denser than water and fluid in nature, it settles to the bottom of the tank in a thin, flat layer.
- As the bacteria die, they decompose and become part of the sludge.
- It is the clear liquid that exists between the scum and the sludge layers.
- The floating scum layer on top of the tank and the sludge layer at the bottom of the tank each take up a specific proportion of the total volume of the tank’s total volume of water.
- As the wastewater rests in the tank, the active solids separation takes place, resulting in cleaner wastewater.
- In order for effective separation of solids to occur, the wastewater must be allowed to rest for an extended period of time in the tank’s quiescent conditions.
A relationship exists between effective volume and daily wastewater flow rate, and this relationship may be expressed as In this equation, retention time (days) equals effective volume (gallons) divided by flow rate (gallons per day) Sludge and scum storage require a minimum retention duration of at least 24 hours, during which half to two thirds of the tank capacity is consumed by sludge and scum storage, according to standard design rules for holding tanks.
- Please keep in mind that this is a bare minimum retention duration under the conditions of a large accumulation of solids in the tank.
- As sludge and scum collect and take up more space in the tank, the effective capacity of the tank steadily decreases, resulting in a shorter retention time.
- In addition to clogged pipes and gravel in the drainfield, which is one of the most prevalent reasons of septic system failure, pathogenic bacteria and dissolved organic pollutants can develop as a result of this practice.
- A common design rule is that one-half to two-thirds of the tank capacity should be set aside for sludge and scum collection, depending on the size of the tank.
- In practice, however, the pace of solids collection varies significantly from one situation to another, and the real storage duration can only be established by periodic septic tank inspections.
- While new solids are continuously being added to the scum and sludge layers, anaerobic bacteria (bacteria that do not require oxygen to survive) are consuming the organic material in the solids, allowing the process to continue.
- Anaerobic decomposition causes a gradual reduction in the amount of collected solids in the septic tank as a result of the process.
Compaction of the older, underlying sludge also contributes to the reduction in the volume of the sludge layer.
Using EnviroZyme’sConcentrated Grease Control 10XandSeptic Treatmentproducts can help prevent non-clarified wastewater from running through an outlet that does not have adequate effective volume and/or retention time.
This successfully minimizes the number of layers in a septic tank as well as the frequency with which it must be pumped out.
The results were interesting.
This was due to the fact that natural wastewater already contains bacteria, and these bacteria gradually regained dominance in the biomass.
(Click on image to expand) In addition, we measured the carbonaceous biochemical oxygen demand (cBOD) in the clear liquid component of each tank, which was approximately 10 inches below the surface of the liquid.
This means that, once treated, the effluent from a septic tank will help to reduce the amount of dissolved organic pollution that enters the surrounding environment.
(Click on image to expand) Are you interested in learning more about how our microbes can be of assistance? Fill out the customer care formhere or call 1-800-232-2847 to get in touch with a representative.
What are the Septic Tank Layers?
Sludge, effluent, and scum are the three layers of wastewater that make up your septic tank: sludge, effluent, and scum. You will have a perfectly functioning septic system when each of these wastewater layers is correctly balanced. As a homeowner, you should become familiar with the indications that indicate when the sludge layer has become overburdened and when your septic tank needs to be drained.
What Are The Three Layers of Wastewater?
- The wastewater in your septic tank is composed of three levels: sludge, effluent, and scum. Sludge is the most solid of the three layers. Your septic system will function correctly if each of these wastewater layers is appropriately balanced. The indicators of an overflowing sludge layer, as well as the signs that your septic tank need pumping, should be recognized by all homeowners at some point in their lives.
Pumping the sludge out of your tank on a regular basis is essential for keeping your septic system in excellent operating order. Find out how often you should pump your septic tank by reading this article. The Septic Medic team may be contacted online or by phone at 570-828-7444 to book routine septic maintenance or a routine tank pumping for homeowners in Pike County, Pennsylvania, including Delaware Township and the surrounding suburbs of Northeastern Pennsylvania.
Septic Emergency? Contact us immediately at570-828-7444
Services Provided by Septic Medics:
- Septic System Pumping and Tank Cleaning
- Repair of a Clogged Drainor Septic System Back Up
- Septic System Maintenance for Tanks
- Septic System Pumping and Tank Cleaning Leach Fields
- Septic Tank Repair or Replacement
- Septic Tank Maintenance
Septic Tank Problems, Part One: A Healthy Septic Tank
“I have no idea why I’m having septic tank troubles; I’ve never even had to pump my tank before,” a common complaint among homeowners. as though this was evidence that their septic system had been functioning well before abruptly failing. However, keep in mind that most failed septic systems have been in problems for one or more decades before the first indicators of trouble show up.
How a Septic Tank Works
Everything that goes down the pipes in your home (toilets, showers, sinks, washing machines, water softener, etc.) ends up in your septic tank, which is located underground. The septic tank is a large-volume, almost often waterproof tank that serves as the first stage of treatment for residential wastewater, capturing solids and settleable organic matter before discharging the wastewater (effluent) into a drain field or other drainage system.
A Healthy Septic Tank
Whatever goes down any of the drains in the house (toilets, showers, sinks, washing machines, water softener, etc.) ends up in your septic tank, which is located underground. The septic tank is a large-volume, almost often waterproof tank that serves as the first stage of treatment for residential wastewater, capturing solids and settleable organic matter before discharging the wastewater (effluent) into a drain field or into a sanitary sewer.
- Scum: Substances that are lighter in weight than water (oil, grease, and fats) float to the surface of the water and produce a scum layer. In the tank, this scum layer floats on top of the water’s surface and collects bacteria. Aerobic bacteria are involved in the digestion of floating particles. Effluent is the cleared wastewater that remains after the scum has risen to the surface and the sludge has sunk to the bottom of a wastewater treatment plant. It is the clear liquid that exists between the scum and the sludge layers. It exits the septic tank and enters the drainfield
- It is a natural occurrence. A layer of sludge is formed at the bottom of the tank as the “sinkable” materials (dirt, grit, bones, and unconsumed food particles) settle to the bottom of the tank. Because sludge is denser than water and fluid in nature, it settles to the bottom of the tank in a thin, flat layer. Underwater anaerobic bacteria devour organic components in the sludge, emitting gases as they do so, and eventually die and become a part of the sludge as they die off.
Read the Other Blogs in This Series:
Troubleshooting Septic Tank Issues, Part Two: The Issues Begin Troubleshooting Septic Tank Issues, Part Three: Drainfield Issues
Maintaining a Septic Tank System
WASTE MANAGEMENTD-1, Home Waste Systems, published in June 1979, 15,000 copies available.
If you already have a septic tank and absorption field built, there are various things you can do to extend their life and safeguard your investment, which could be as much as $2500 or more. Here are a few pointers that you can follow. The idea that septic tanks should be examined at least once a year is something that is frequently disregarded or neglected. The sludge that forms at the bottom of every well working septic tank is known as scum. It is necessary to clear this sludge on a regular basis since it is constituted of solid elements.
- By allowing sediments from the septic tank to wash out into the absorption field, the field will ultimately get clogged to the point where a new field will need to be installed.
- Tanks with a smaller capacity must be pumped more frequently.
- A number of additives may cause sediments to be drained from the septic tank into the absorption field, increasing the likelihood of clogging issues in the absorption field.
- The thickness of the sludge in your septic tank may be tested to assess whether or not your tank requires pumping, as depicted in Figure 1.
- Reduce the stick’s length by lowering it through the intake tee (to avoid scum) to the bottom of the tank.
- The amount of sludge present will be shown by the amount of black particles clinging to the towel.
- Septic tanks may occasionally generate a layer of floating scum that collects on the surface of the water.
A stick and hinged flap device can be used to determine the thickness of the scum layer (Figure 1).
Raise the stick until you can feel the bottom of the layer beneath your finger.
Use the same approach to find the lower end of the submerged input pipe at this point as well.
Septic tank pumping services are provided by contractors in the majority of towns.
The contractors pump the contents into a tank truck and dispose of them at a treatment facility that has been approved or by applying suitable land application techniques.
When pumping a septic tank, it is not advisable to wash, scrape, or disinfect the septic tank.
In a similar vein, it is not required to leave sediments in the septic tank in order to “restart” it. Normally, the natural processes begin as soon as the septic tank begins to fill. While there are products available to “seed” the system with desired bacteria, they are not required.
How your septic system works
A septic tank and a drainfield are the two main components of a septic system. Water from your home is channeled into your septic tank, where heavy sediments sink to the bottom of the tank and produce a layer of sludge on the bottom of the tank. Grease, toilet paper, and other light substances float to the surface and accumulate to produce a scum layer on the surface of the water. Between the sludge and the scum is a semi-clear layer of wastewater known as effluent, which contains no particles and is located between the two layers.
- Bacteria living in the soil purify wastewater by devouring dangerous bacteria and viruses before the wastewater seeps into the groundwater table.
- These layers will ultimately require the services of a professional septic pumper to be removed.
- In order to properly maintain and check your septic system, you must first identify the sort of system that you have, as well as the needs for particular maintenance and inspection.
- Pressure distribution systems, sand filter systems, mound systems, and aerobic treatment units such as the Glendon BioFilter system are examples of other types of systems.
How to Measure Septic Tank Sludge Depth
What is the best way to determine when to pump your septic tank? In a previous piece, you learned that the only way to know for certain when to pump your septic tank is to take an actual measurement of the amount of accumulated sludge and scum in the tank. It is designed such that the septic tank should be pumped when the combined sludge and scum layer displaces 30% of the tank’s total volume. Using the above example, if the liquid depth of the tank is 48″, the tank should be pumped when the combined thickness of the sludge and scum layer measures 14 12″ (48″ X 0.30).
An example of this would be a long hollow plastic tube with a check valve at the bottom of it.
- The scum layer should be pushed through until it is almost broken through by the sludge judge. Mark on the tube in a visibly obvious manner the link between the top of the scum layer and the spot on it. Pulling the tube up and measuring the length of the tube are two options. In many cases, you may see part of the scum layer adhered to the tube to help you locate it
- This is normal.
The following are the measurements for the sludge layer:
- Slowly lower the tube into the septic tank until it comes into contact with the tank’s bottom
- And With each gradual pull of the gadget out of the water, the check valve shuts, allowing a liquid/solid profile of the septic tank water to be captured. It is possible to determine the thickness of the sludge layer
The collected sludge inside the tube measured around 8″ – 9″ in diameter, and there was no scum layer present in this specimen. The thickness of the scum layer would simply be added to the 8′ – 9″ measurement if there was one. In this particular instance, the scum/sludge layer combined displaces approximately 18 percent of the tank volume (8 12″/48″ in this case). Upon further investigation, it was discovered that this septic tank had last been drained 26 months before. The septic tank should be pumped within 43 months of the last septic tank pump out, based on this date (0.18 / 26 months X 0.30 = 43 months) of the last pump out.
- Even if the cost of $75 for a sludge judge is beyond of reach for you, you may construct your own gadget that will do the same function.
- The length of the stick will vary depending on how deep your septic tank is buried.
- The idea here is to avoid wrapping it too tightly around the stick’s handle.
- Pay close attention to the link between the top of the scum layer and the placement on the sticking stick.
- The scum layer is often adhered to the stick to help you locate it, and this is a good way to identify the location.
- Continue to slide the stick back and forth in a plus (+) pattern for approximately 2″ in each direction to enable the solids to flow through the cheesecloth slowly and softly.
Measure the witness line of solids that are lodged into the cheesecloth to determine the amount of solids present. Measure the distance between the “wet” mark on the upper end of the stick and the bottom of the stick. Calculate the percent capacity in the same way as in the previous example.
Troubleshooting Septic Tanks
Receive articles, stories, and videos about septic tanks delivered directly to your email! Now is the time to sign up. Septic Tanks and More Receive Notifications It is necessary to open the tank when resolving onsite system problems or when doing an examination of a septic tank so that the contents can be inspected and the condition of both the inlet and outflow baffles can be checked. By just observing the contents of the tank and the baffles, it is possible to gain valuable insight into the overall operation of the system.
In order to identify if the tank contains the three separate levels that should be present, the contents should be analyzed.
If any of these layers are missing, the tank will not operate as efficiently as it should.
The homeowner should be informed of the presence of a large amount of floating material that does not belong in the tank, as well as a large amount of undigested food, so that they may learn how to properly maintain their system and avoid introducing these materials into the wastewater.
In the case of a large amount of undigested food, it might suggest that one of the members of the home suffers from an eating issue or that the garbage disposal is being used excessively; any talk with the owner should be done with caution.
The scum layer should not be extremely thick, and it should not extend beyond or below the exit baffle at any point.
A heavy layer of scum may suggest that the tank need cleaning, but it may also signal that there is a backup owing to an outlet or blockage in the drainfield that is causing water to back up into the tank.
Users of the system may be able to adjust their behaviors or have the tank cleaned on a more frequent basis in this setting.
The tank should be cleaned if the top of the sludge layer is closer than 12 inches to the bottom of the exit baffle, which indicates that the sludge layer is too thick.
A result of this scenario is that sediments are supplied to the soil treatment area, which causes the effluent screen to get clogged with particles.
Otherwise, it may be necessary to build a larger tank or an extra tank in series in order to alleviate the greater flow problem.
If you have any questions concerning septic system maintenance and operation, you can send them to him by email at [email protected]
This article is part of a series on troubleshooting septic tanks:
- Troubleshooting Problem Systems
- Troubleshooting Septic Tanks
- Tank Troubleshooting: Checking Inlet and Outlet Baffles
- Troubleshooting Septic Tanks Troubleshooting: Additional Items to Check in Septic Tanks That Are Having Problems