Method for improving treatment efficiency of sewage plant by utilizing bypass sludge activity enhancing technology

Abstract

The invention discloses a method for improving treatment efficiency of a sewage plant by utilizing a bypass sludge activity enhancing technology. The method comprises the following steps of: enabling sewage after primary pretreatment to pass through a main biological tank for secondary treatment and then flow into a secondary sedimentation tank, performing sludge-water separation in the secondary sedimentation tank, discharging supernatant fluid of the secondary sedimentation tank or enabling the supernatant fluid to be subjected to follow-up advanced treatment, conveying activated sludge concentrated by the secondary sedimentation tank to a bypass biological tank through a sludge reflux pump and a pipeline, and enabling the activated sludge to reflux to the water inlet end of the main biological tank after aerobic, anoxic and anaerobic biochemical process treatment in the bypass biological tank. According to the method disclosed by the invention, the total amount of the activated sludge in the sewage plant can be greatly improved by simply transforming (combined building) the existing biological tank or only newly building a small-volume bypass biological tank (separate building), and the total retention quantity of MLSS (mixed liquor suspended solids) of the biological system disclosed by the invention can be improved by 18%-100% in comparison with the process in the prior art. The method disclosed by the invention is suitable for not only new building of sewage plants, but also upgrade and standard-raising transformation of the existing sewage plants; and the method disclosed by the invention has the advantages of high efficiency, low consumption and low investment.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for improving the treatment efficiency of a sewage plant by using bypass sludge activation enhancement technology. Background technique [0002] At present, China's water environment problems are becoming more and more prominent, and the pressure of energy conservation and emission reduction is increasing. In addition to large-scale construction of sewage treatment systems, sewage treatment plants that have been built or are in operation are also facing increasingly stringent water quality requirements. It will become the theme of sewage plant construction and renovation for a long period of time in the future. However, the main problems faced by China's sewage plants at present are mainly problems such as insufficient carbon sources in influent water, poor nitrogen and phosphorus removal effects, and limited expansion sites for sewage plants. At the same time, due to the im...

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Problems solved by technology

[0006] The existing technologies include: "regenerated activated sludge" process or "adsorption-regeneration" process, but these two forms of regeneration tank are continuously aerated and completely aerobic, so there are some shortcomings. One is due to the complete aerobic state, Therefore, there is no anoxic environment for denitrification and denitrification; the second is a completely aerobic state, the organic matter adsorbed in the sludge cannot be anoxic or anaerobic hydrolyzed, and the potential "internal carbon source" of activated sludge has not been effectively utilized. Unable to release SCOD and VFAs into the mixed liquid; third, due to the continuous aeration, the energy consumption is high

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