Method for purifying sewage by activated sludge biological film zone

Abstract

The invention discloses a method for an active sludge biomembrane zone to purify domestic sewage. The sewage flows to a biochemical reaction tank after the precipitation treatment of a water regulating tank and a grid; the biochemical reaction tank consists of three parts which are respectively a hydrolytic acidification tank, a contact oxidation tank and a facultative sedimentation tank, wherein, the three tanks are all provided with the biomembrane zone; and the sewage flows to the biochemical reaction tank and is treated by the hydrolytic acidification tank, the contact oxidation tank and the facultative sedimentation tank sequentially to finish the sewage purification process. The method adopts the anaerobic-aerobic-anoxic technological process and the combination of the active sludge and the biomembrane zone to greatly improve the microbial biomass in the system, so as to improve the sewage treatment efficiency. As microorganism in the reaction tank has large biomass and rich varieties and the fixed space of the biomembrane zone can ensure more stable microflora, the system has strong anti-shock loading performance and stable technology. The biomembrane zone system can realize efficient denitrification and dephosphorization, and the purified domestic sewage reaches the national discharge standard.

Description

technical field [0001] The invention relates to a method for purifying domestic sewage, in particular to a method for purifying domestic sewage with activated sludge biofilm. Background technique [0002] At present, the activated sludge method is generally used in the purification and treatment of domestic sewage in cities and towns in my country. The method is to carry out continuous mixed culture of sewage and various microbial groups under the condition of artificial oxygenation to form activated sludge, and use the biological coagulation, adsorption and oxidation of activated sludge to decompose and remove organic pollutants in sewage. Although the activated sludge method has a high removal efficiency for organic matter in domestic sewage, the disadvantage of the above method is that the removal rate of nitrogen and phosphorus in domestic sewage is very low, and the method for purifying and treating urban domestic sewage by activated sludge is still limited. There are ...

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Problems solved by technology

Although the activated sludge method has a high removal efficiency for organic matter in domestic sewage, the disadvantage of the above method is that the removal rate of nitrogen and phosphorus in domestic sewage is very low, and the method for purifying and treating urban domestic sewage by activated sludge is still limited. There are problems such as large energy consumption, large amount of sludge, complex management, and low impact load resistance

Relatively advanced domestic sewage purification technology such as the Chinese invention publication number is CN1887739A, and the title of the invention is the technical scheme disclosed in "activated sludge-biofilm composite integrated sewage treatment method and its device", which uses activated sludge and biofilm composite However, the disadvantage is that the biofilm carrier used is the traditional soft filler, semi-soft filler, combined filler, elastic filler, suspension filler, etc., which have a small specific surface area and a small biomass of attached microorganisms. less, the processing efficiency is low, and the above-mentioned fillers also have problems such as poor durability

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