Sewage treatment process and special-purpose one-piece sewage treatment plant

Abstract

The invention discloses a sewage treatment process and a special-purpose one-piece sewage treatment plant. The process comprises the following steps: 1) arrangement of a water inlet system: sewage input from an inlet pipe and pretreated by thick and fine gratings and a vortex-type grit chamber is sent into a biological reaction system; 2) arrangement of the biological reaction system: the biological reaction system is divided into an anoxic area, an anaerobic area, an aerobic area and a sedimentation area, and activated sludge in each area utilizes katabolism of microbes to converse organic matters into inorganic matters to realize nitrogen and phosphorus removal; 3) arrangement of the sedimentation basin: sludge and water in the treated sewage can be separated, so that the water outlet is clarified; and 4) arrangement of a disinfection tank: the treated water from the step 3) is disinfected to kill pathogenic organisms and then discharged through an outlet pipe. The invention also discloses a one-piece sewage treatment plant. The invention has the advantages of small land occupation, small investment, compact mechanism, low loss of a water head, low investment for the engineering project, optimized, stable and mature technology, good nitrogen and phosphorus removal effect and good organic pollutant removal effect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to the technology of a sewage treatment process and a special sewage treatment device. Background technique [0002] At present, 80% of urban sewage treatment plants in my country use activated sludge or other traditional processes. Commonly used sewage treatment processes include AAO, AO, SBR, CASS, USBA, MBR, oxidation ditch and other improved processes. Nitrogen and phosphorus removal and organic matter removal rate are also high, the process is mature and stable, and the operation and management are simple, but the process principles, characteristics and equipment are different, and the existing problems are also different. [0003] 1. A 2 / O process is AAO process [0004] 1. Basic principle: A 2 / O process, which is the abbreviation of anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal process. The treatment efficiency of this process can generally...

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Problems solved by technology

(4) The denitrification effect is affected by the reflux ratio of the mixed liquid, and the phosphorus removal effect is affected by the DO and nitrate oxygen entrained in the reflux sludge, so the denitrification and phosphorus removal efficiency cannot be very high

The disadvantages of oxidation ditch are: prone to sludge bulking problem, unstable operating flow rate, easy to produce dead cycle sedimentation sludge, long sludge age and easy aging of sludge

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