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1, summarize
Wastewater anaerobic biological treatment is the environment project and energy project a key technology of the organic wastewater, is one of the methods of dealing with the strong, in the past, it used the municipal wastewater treatment plant sludge, organic waste and the part of high concentration organic wastewater treatment processing, in building the main form using common digestive pool, and because it has hydraulic retention time long, organic low load faults, a long time limited its applications in wastewater treatment, since 1970 s, the world energy shortages have become increasingly prominent, can produce energy of wastewater anaerobic technology attention, research and practice, the further development of new technology and equipment, and greatly improve the anaerobic activated sludge holdings in the reactor, the processing time shortens greatly, improve efficiency.
2, Basic principle
Wastewater anaerobic biological treatment is to point to in no molecular oxygen conditions through the anaerobic biological (including the role of oxygen and biological), all kinds of organic wastewater to complex molecules into methane, carbon dioxide and other material, also known as the process of anaerobic digestion.
Wastewater anaerobic biological treatment is in anaerobic conditions of use of anaerobic microbe degradation of the air action to make organic matter in sewage to purify processing technique. In anaerobic conditions, wastewater anaerobic bacteria in the carbohydrate, protein, fat and other organic decomposition of organic acid, and then generate in methane bacteria, the function of further fermentation, carbon dioxide and methane form hydrogen, etc, to make the purified sewage. Such as the septic tank and sludge anaerobic digestion, anaerobic pond, etc. Anaerobic biological treatment of sewage from BOD load is higher, such as anaerobic digestion of BOD load is commonly 3.5 kg/m3 d.), the removal rate of 90% and the processing costs less than aerobic treating, is life sewage sludge, high concentration organic wastewater and industrial wastes treatment method of good.
3, Main characteristics
Application scope.
Low energy consumption.
High load.
Excess sludge quantity is little.
Nitrogen, phosphorus nutrition requirements for less.
Anaerobic process must have antiseptic effect, can kill wastewater and sewage from the virus, etc.
Anaerobic activated sludge can be stored for a long time, anaerobic reactors can seasonal or intermittent operation.
4, Scope
Organic sludge treatment
High concentration organic wastewater
Medium, low concentration organic wastewater
Urban wastewater treatment