Sewage treatment system

Abstract

The invention discloses a sewage treatment system and relates to the technical field of sewage treatment. The sewage treatment system comprises a pre-anoxic zone, an anaerobic zone, an anoxic zone I,an aerobic zone I, an anoxic zone II, an aerobic zone II, a precipitation zone, a first conveying component, a second conveying component, a first reflux component and a second reflux component; stirring devices are arranged in the pre-anoxic zone, the anaerobic zone, the anoxic zone I and the anoxic zone II; aeration devices are arranged in the anoxic zone I and the anoxic zone II; the second reflux component comprises a first sub-reflux component and a second sub-reflux component; the first conveying component is communicated with the pre-anoxic zone, the anoxic zone I and the anoxic zone II; the second conveying component is respectively communicated with the aeration device in the anoxic zone I and the aeration device in the anoxic zone II; the first reflux component is communicated with the precipitation zone and the anoxic zone I; the first sub-reflux component is communicated with the anoxic zone I and the pre-anoxic zone; the second first sub-reflux component is communicated with the aerobic zone II and the anoxic zone II. The sewage treatment system can improve the removal efficiency of nitrogen and phosphorus in sludge.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system. Background technique [0002] At present, the commonly used sewage treatment technologies in villages and towns are divided into two categories in principle, namely, ecological treatment technology and biological treatment technology. Among them, ecological treatment technology uses the function of soil-plant system to purify sewage, and its purification mechanism includes soil filtration and interception, Physical and chemical adsorption, chemical decomposition, plant and microbial uptake, microbial decomposition and transformation, evaporation, etc., are mainly constructed wetlands, land treatment systems and stabilization ponds. Although the infrastructure and operating costs of ecological treatment technologies are relatively low, their It occupies a large area, is greatly affected by the climate, and has poor senses, which limits its large...

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Problems solved by technology

[0002] At present, the commonly used sewage treatment technologies in villages and towns are divided into two categories in principle, namely, ecological treatment technology and biological treatment technology. Among them, ecological treatment technology uses the function of soil-plant system to purify sewage, and its purification mechanism includes soil filtration and interception, Physical and chemical adsorption, chemical decomposition, plant and microbial uptake, microbial decomposition and transformation, evaporation, etc., are mainly constructed wetlands, land treatment systems and stabilization ponds. Although the infrastructure and operating costs of ecological treatment technologies are relatively low, their It occupies a large area, is greatly affected by the climate, and has poor senses, which limits its large-scale application; biological treatment technology is to degrade and transform organic pollutants, nitrogen, phosphorus and other nutrients through microorganisms to make them stable and harmless. Methods include aerobic and anaerobic biological treatment methods; among them, aerobic biological treatment has more advantages due to its faster reaction speed and high efficiency. The commonly used processes for aerobic biological treatment mainly include activated sludge method and biofilm method. However, the biofilm method requires electrical equipment due to its aeration, backwashing and other processes, and consumes a lot of power; the filler is easy to block and needs to be backwashed, otherwise it will affect the water quality of the effluent, and the backwashing takes a long time and consumes a lot of water. The quality of the initial effluent after flushing cannot be guaranteed; environmental hygiene problems such as mosquitoes and flies, and odors are easy to produce, which is not ideal for sewage treatment in villages and towns

[0003] According to experience, the low carbon-to-nitrogen ratio of village and town sewage influent is very common. Due to its own limitations and the lack of influent carbon sources, it is difficult for traditional processes to achieve efficient and stable removal of nitrogen and phosphorus. Currently, the commonly used method is to add external carbon sources, such as methanol and acetic acid. Sodium, etc., and the addition of carbon sources has the disadvantages of complicated operation, high cost, and easy to cause secondary pollution, which makes the efficiency of nitrogen and phosphorus removal not high

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