The main reason of odor in the Treatment Plant and its vicinity is the emission of Hydrogen Sulfide which is already generated in the networks when sewage is flowing and collected in the sump of lifting & pumping stations. As the sewage arrives in STP this H2S emits out and create smell in STP as well as in the surroundings. So controlling the odor generation in these structures is highly essential.
Odor generation is completely a biological process. It produces in the slime layer developed in the structures and in the pipes along with growth & propagation of SRB (Sulfur Reducing Bacteria) in the slime. Please read "Quality Assessment of Water & Wastewater" published by CRC press to understand the process of Odor Generation.
The best process of controlling odor generation & emission shall be BIOLOGICAL. Secondly controlling process shall start from the inlet manhole of Lifting & Pumping Stations or in the network. Because we have to control the generation of odor not the emission only so it must be controlled at the ORIGIN.
This can't be controlled by using any spray or any chemical based process because these will give only temporary relief.
I have developed a technology ABR (Anoxic Bioremediation) Technology with Strict Anaerobic & Facultative Bacteria which give you permanent relief from your problem. you will get rid of odor within 2 hours from the treatment plant & within 24 hours from its vicinity. This is used in more than 100 projects in various countries with complete success. Best part of this technology is it will help to reduce the BOD, COD and Oil/grease levels in the Raw sewage. This treatment will take place when sewage is flowing in the pipes.
We offer a 100% plant extract based, organic certified product that is the solution to your odor problem. The product also offer added benefits to your plant and will improve your outflow quality. Masking the odour is never the solution. You can expect a drastic reduction in odour, phosphates, phosphorus, nitrates and ammonia if applied. You are welcome to email me on dave@makroorganics.com for detailed information.
The reason for smell is that the plant is not aerated enough, so if correctly build, WWTP does not produce any odours in the wastewater. www.eecusa.com
The best way to reduce the odor in wastewater treatment is to use aeration. We can not to use any other method as it will have adverse effects on the air and water.
simplistic (not simple) answers are often not a true, complete solution... There are many technically sound answers that merit more attention than just blindly increasing aeration, even though that may work in many cases.
I am not fully sure where your odor is created but, here is what we do in our collections system to keep odor and corrosion down all the way through the process. We add Neutrac SLS45 (Supplied by Univar) which is a lime slurry product. This adds alkalinity which aids in our treatment all the way through our process. This product will settle out over time and added maintenance will be required.
I am not sure what they use but in 1999 I visited Rikuzentakada, Japan leading a Rotary Group Study Exchange Team. The Waste Water Plant was on the ocean front and there was absolutely no smell. It was one of the prize features of the community.
Additionally, I am putting together the ingredients for a Water Centric Sustainable (New) City and got a proposal from Suez Water for a waste system that dries the waste and cleans it so it can be used for organic gardens.
Anghel, strat identifyiung the section where the odour is produced, Normally in Domestic wastewater the main odiur comes from the sewage, especially if there is immission of air to remove oil, sands etc. The activated sludge basins, if the process is properly operated, has a typical pleasent "humus smell" if there is always enough oxygen. Also secondary clarifiers do not have to rpoduce bad odours. The section that produces unpleasent smell is the sludge dewatering: this has to be confined and air removed and treated.
If the plant is an Industrial WWTP, the bad odour apart ,the waste sludge line, can be produced in the aeration tank where some compounds can be stripped: here you have to investigate as Matthews suggests.
Anghel, the solution depends on a number of factors. Do you have any H2S readings for the crude and at each stage through the treatment process? Where is the treatment works? Is the climate hot? What flow or population does the works treat? What processes does the works have and are they being operated properly e.g. is sludge removal being adequately carried out?
The introduction of substances into the process is unlikely to effectively solve the problem of odors. An integrated approach is required for the solution. To purify the air and remove odors in the process, biofilters with biological preparations are used. For dehydrated sludges are used biopreparations or bioengineering technology for intensive processing into compost (if allowed) or solid fuel. The use of sprays is unacceptable. Specific offers for specific conditions - services are paid
We target one of the worst smells. Dissolved H2S is reduced to a benign state after we remove the hydrogen (zero-carbon!). The "Knapp Process" simultaneously produces hydrogen 24/7 and reduces treatment costs by doing so.
Dissolved h2s is easy to be removed by potassium permanganete without implementing expensive humpty-dumpty enviromental-friendly solution. Why don't you kill yourself and leave the world as better place?