'Main-auxiliary' activated sludge method for coupling deodorization and strengthening nitrogen and phosphorus removal

Abstract

The invention relates to a 'main-auxiliary' activated sludge method for coupling deodorization and strengthening nitrogen and phosphorus removal. A main line adopts traditional activated sludge and adeformation process thereof, and in an 'auxiliary' line, a sludge micro-screen filter, a side-flow sludge biological culture tank (S2HBR) filled with a strain culture tank (SBIO-A) and a side-flow activated sludge anaerobic hydrolysis tank (S2ASH) reactor are arranged in an activated sludge return line; an auxiliary line reaction tank S2HBR and S2ASH tank can be connected in parallel or in series.The method can directionally enrich, and significantly improve and optimize a flora structure of the activated sludge, 'main-auxiliary' reactor combination achieves the directed cultivation of specific microorganisms through a side-flow reactor on the 'auxiliary' line and conducts functional microbial inoculation on a main biochemical system on the 'main line', and the 'main-auxiliary' reactor configuration can achieve deep denitrification and dephosphorization of the biochemical system, and significantly improve the deodorization effect of the whole process, while saving commercial carbon sources and achieving activated sludge In situ process reduction.

Description

technical field [0001] The invention belongs to the field of sewage treatment and water environment treatment, and in particular relates to a "main-auxiliary" activated sludge method that couples the whole process of deodorization and strengthens the functions of nitrogen and phosphorus removal. Background technique [0002] At present, China's water environment problems are frequent, surface water eutrophication is serious, and the water quality of some water areas even loses the function of drinking water source. important long-term tasks. At the same time, due to historical reasons, many urban sewage plants are built in urban areas. The process of sewage collection and treatment releases a large amount of volatile odorous gases (such as hydrogen sulfide, ammonia, etc.), which seriously interferes and affects the ambient air quality of surrounding cities. The avoidance effect becomes more prominent. Stable water quality compliance and odor control are common problems fac...

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Problems solved by technology

[0003] At the same time, many areas of our country suffer from severe shortage of carbon sources for sewage plants. Existing conventional treatment processes, such as deformation processes of various activated sludge methods, AAO and its variant processes, oxidation ditch, MBR, SBR and Its various variant processes mainly rely on the traditional phosphorus removal bacteria Accumulibacter to achieve EBPR (Enhanced Biological Phosphorus Removal), while Accumulibacter can only rely on the ingestion of VFA in the influent, and there is also substrate competition between PAO and GAO; in addition, the reflux of nitrate and DO Interference with the anaerobic zone makes it difficult to control the ORP below -150mv in the anaerobic zone, which is not an ideal anaerobic environment for biological phosphorus removal. Many of the above factors lead to unstable biological phosphorus removal effects of traditional mainstream treatment processes

In addition, the high pollution load caused by the high ammonia nitrogen reflux of the sludge dewatering liquid in the sludge treatment section, the low water temperature season and other factors lead to insufficient nitrification capacity and the ammonia nitrogen in the effluent does not meet the standard. The above factors make it difficult for the traditional process to remove nitrogen and phosphorus. For further improvement, standard upgrading often has to choose to transform the original aeration tank into the IFAS process, or add a third-level biochemical treatment unit (such as BAF, deep-bed denitrification filter), which greatly increases the project investment. At the same time, it also increases the operating cost during the operation period, and the greenhouse gases released by the environment also increase exponentially with the prolongation of the process. The lengthy upgrading and transformation process is generally unsustainable

[0004] After more than a hundred years of development, the activated sludge process is still the most economical and effective method for sewage treatment. However, the traditional mainstream activated sludge process is vulnerable to external disturbances (water quantity, water quality, and water temperature changes). From the perspective of the control of the bacterial flora structure, because the traditional mainstream activated sludge process only has the activated sludge process on the "main line", although anaerobic, anoxic and aerobic environments are set, the above environments are affected by various factors (influent water quality water fluctuations, internal backflow and external backflow), and the removal of different pollutants must be taken into account, but the ecological niches of different microorganisms are very different, so it is difficult to take into account the habitat conditions of different functional flora under the process control conditions, and it is difficult to realize the removal of active pollutants. The optimization and regulation of the structure of the mud flora makes it more difficult to achieve directional transformation and control

[0005] In response to the above problems, the current technical route solutions often use "multiple methods" and "separate solutions". The process is becoming more and more complicated, but systematic and collaborative consideration is not achieved, and nutrients are often solved through the superposition of lengthy process routes. However, the deodorization problem is still not resolved, and it is still necessary to increase the deodorization measures along the whole process along with the extension of the sewage treatment process, resulting in high investment and operating costs for the deodorization system.

Some deodorization technologies commonly used at present ...

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