What types of sewage treatment units? Is the determination of the type depends on the capacity or components of water entering or the philosophy of the designer?
Dear Ali,
Sewage treatment plants can be classified into 7 types of system. All of wastewater treatment plants operate in different ways and produce effluent of varying quality. Moreover, they all cope with different kinds of usage to differing degrees of success; some can tolerate being underloaded where some do not function as effectively. Some plants are most efficient with higher loadings where others are not able effectively process high levels of sewage. However, in all of the above cases, your sewage treatment plant must have the following:
1. An EN 12566-3 test certificate
2. Either an exemption or a Permit to Discharge (formerly Consent to discharge) from the Environment Agency
3. The ability to produce an effluent quality that enables you to comply the terms outlined by the Environment Agency (in their Permit to Discharge). This is typically 20mg/l of suspended solids, 30mg/l of biochemical oxygen demand (BOD) and 20mg/l of Ammoniacal Nitrogen (NH4)
With my best regards
Prof. Bachir ACHOUR
This question has more than one answer, as wastewater treatment plants(WWTP) can be one of the followings:-
1- municipal or industrial
2- aerobic or anaerobic (in terms of biological treatment)
3- with flow equalization or without.
But in general the following processes are the main in a WWTP::-
1- Physical treatment
2-Biological treatment
3- Sludge treatment
4- Disinfection
I also agree with our colleague Bachir_Achour, and that there is also a hydraulic design for the units.
Dear Dr. Ali,
In India, mainly the following technologies are employed in various sewage treatment plants (STPs):
Activated sludge process (ASP),
Up flow Anaerobic Sludge Blanket (UASB)
Waste Stabilization Ponds (WSP)
Oxidation Pond (single stage)
Fluidized aerobic bio-reactor (attached growth)
Trickling Filters or Biofilters
ASP, UASB and WSP are the most working technologies in the Class I and II cities.
The capacity/performance of the STPs is different in regard to input loads and quality of produced effluents. But a treatment plant has to qualify the environment standard before discharge of effluents.
Regards
- Badges
- Science method
- Similar topics
- Philosophy