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Grease Removal and Control
Grease Elimination.pdf
Why is grease a problem? Are there alternatives?
Why is grease a problem? Are there alternatives?
Grease is a problem and can be costly for multiple reasons:
- In the sewage collection grease mixes with cooler waters and solidifies. As is solidifies, it sticks to any surface and starts to accumulate. If it accumulates enough on a collection pipe wall, it could clog the pipe and back up the system. There is cost to unclogging the line. There is also often cost with sewage spills either on the ground or in the business(es) or restaurant. There can also be costs after unclogging a pipe due to sending so much solidified material to the nearest manhole or lift station clogging up lines and/or pumping. A few years ago, the federal government raised the required temperatures for restaurants from 180 degrees to 210 degrees. The impact on this is that the grease now does not cool down in the grease traps, but later in the pipes or lift stations.
- Grease build up can accumulate inside a lift station. Lift stations often use float balls that activate pumps when they turn up as the lift station fills up with sewage. Float balls can fail to turn and activate if grease accumulates on them. Transducers (measure pressure) can also be used in larger lift stations to activate pumps measuring pressure as the station fills up and sending a signal to turn pumps on. Transducers have pressure plates that do not act correctly if covered by grease. When a lift station fails, back-ups can occur, sewage spills can result around the station, and more. Grease build up on control equipment like float balls can even prevent a float ball from de-activating causing the pump not to shut off when needed and burning up expensive equipment and potentially causing an expensive emergency repair.
- Oil and grease also hamper effective treatment at the wastewater treatment plant. Grease is the number one cause of treatment plant foaming and solids bulking. FOG is expensive to treat once it reaches the treatment plant. Additional air and retention times are needed raising the cost of treating each gallon of sewage.
- Grease and fats stink. Their odor is obnoxious at best. If a manhole or lift station that has a FOG issue, is near any businesses or residents, complaints are common. Odors can also be hard to treat. Masking agents, simply employing a stronger more appealing smell to cover the obnoxious odor, is the cheapest and most common. Other treatments include air scrubbers and chemical treatments. Both can be very costly. ESI does have some good alternatives that seem to work in almost every condition… Call us for more details or look on this site for BioEngergizer.
- FOG is a major contributor to low dissolved oxygen (D.O.) levels in collection systems, manholes and lift stations. As D.O. levels go down, anaerobic bacteria grow (just like in a septic tank and drainfield). The problem is the types of bacteria that grow in this environment release odorous and toxic gases. These gases also have detrimental effects on concrete and metal. Therefore equipment, lift station piping and the holding tank itself are subject to attack. As the levels of D.O. decrease, the populations of anaerobic bacteria increase, therefore so do the detrimental effects. Many municipalities have large maintenance budgets just for lift station and piping repairs. ESI has a solution. It is a solution that not only relieves odor problems and raised D.O. thus saving these critical components; it actually lowers CBOD and TSS so the treatment plant costs are also lowered. Call us for more details or look on this site for BioEngergizer.
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