I am working on a project to reduce odor for a sewer system. In the sewer system there are two lift stations with large storage volume and low flows. Have any of you ever filled in a portion of the wetwell with concrete blocks or concrete to get the pumps to cycle more often and keep the sewage moving? There are odor problems at these stations and they pump directly to the sewer plant and they have odor problems there also. The odor problems occur around 9 pm and 7 am. The lift stations were designed for future growth that has not happened. They are set up to chemically treat for odor but I am trying to help optimize the stations so they can reduce the amount of chemicals.
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Sewer Odor Problems 2
- Thread starter redbridge
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Not familiar with that. Have you tried different chemical?
There is a vortex that can be inserted to reduce odors.
You can also recycle the flow through a venturi to aerate the contents.
There is a vortex that can be inserted to reduce odors.
You can also recycle the flow through a venturi to aerate the contents.
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Thanks bimr. I am getting ready to try some different chemicals. Am I thinking about this correctly. That if I decrease the time the sewage is in the lift stations the less odor there will be. I was wanting to optimize the wet well size before determining the amount of chemicals that would be needed.
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The square footage of the wet well is so large that adjusting the floats wont do much good. That is why I was thinking about installing concrete blocks or pouring concrete in the bottom to reduce square footage so I could get 30 minutes or less hold time. Do you think this would help the situation?
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It would definitely help with the lift station odor issue. It might be possible to just fillet around the sides. You may still have problems with the force main as the others have pointed out, if the material will be sitting in the pipe for long durations.
The question is when will the lift station capacity be increased and you would need to remove the concrete.
The question is when will the lift station capacity be increased and you would need to remove the concrete.
jojopollo7
Petroleum
just to recap a few others opinions, you will always have odor problems until you reduce the hold time as anaerobic conditions will begin to set in. Have you contemplated installing some diffusers at all if it is absolutely necessary to keep the capacity of the lift stations the same?
dicksewerrat
Civil/Environmental
They used to have a product for degreasing wet well that smelled like oranges. It floats on top of the liquids and recoats the walls as the level moves. You might try looking for that. Also instead of concrete blocks in the wet well why not use some sealed pipes that are weighted to make them float vertically in the well. Easier to remove.
Richard A. Cornelius, P.E.
Richard A. Cornelius, P.E.
dicksewerrat
Civil/Environmental
One other thing. That is not an odor, that is the aroma of money.
Richard A. Cornelius, P.E.
Richard A. Cornelius, P.E.
jamiejones16
Geotechnical
How about doing the chemical scrubbing and using ozone as the oxidant? If the odours were really that terrible and volumes of air are high, scrubbing is the most effective method you can employ. Before that you must first determine the following: type of odour, odour concentration, temperature, specific ozone dose, contact chamber retention time, waste water acceptability criteria and the time of scrubbing system.
Boifilters can also be a good option. The only weak point is the installation, as it requires a vast land site to set it up.
Boifilters can also be a good option. The only weak point is the installation, as it requires a vast land site to set it up.
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