Process method for in-situ upgrading and capacity expansion of municipal sewage

Abstract

The invention discloses a process method for in-situ upgrading and capacity expansion of municipal sewage, and belongs to the technical field of sewage treatment improvement. According to the invention, modification is carried out on the basis of a traditional municipal sewage treatment process, and a biofilm blanket process is added into the biochemical pool, so that mud-film symbiosis is realized, and broad-spectrum adaptability is enhanced. Meanwhile, a sludge conditioner and a biological activity growth promoting agent are added in the treatment process, the two substances and the biological membrane blanket cooperate with each other, the biological activity of the activated sludge can be greatly improved, and the sludge conditioner and the biological activity growth promoting agent are mixed with microelements and stimulating factors required by growth and proliferation of microorganisms. The biochemical reaction activity of the sludge can be improved, and rapid metabolism and proliferation of a biological membrane are promoted. Compared with the prior art, the sludge amount of a biochemical system can be increased by 50%-200%, the biological activity can be improved by 30%-50%, and the mass transfer efficiency can be improved by 20%-30%.

Description

technical field [0001] The invention relates to a process method for in-situ standardization and capacity expansion of municipal sewage, and belongs to the technical field of sewage treatment improvement. Background technique [0002] The building construction in the city is getting higher and higher, the sewage discharge per unit area is increasing, and the national requirements for pollutant discharge standards are increasing year by year. Therefore, the existing municipal sewage treatment plants are facing dual pressures for capacity expansion and bid improvement, but the city already has very little extra land for sewage plant expansion and bid improvement. Therefore, the way to upgrade the capacity is either to increase the capacity in situ, or to transfer it over a long distance. However, the cost of long-distance transfer is high and construction is difficult. In-situ upgrading and capacity expansion have become an urgent need for upgrading and capacity expansion of ...

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Problems solved by technology

However, the cost of long-distance transfer is high, and construction is difficult. In-situ upgrading and capacity expansion have become an urgent need for upgrading and capacity expansion of urban sewage plants.

[0003] At present, in the existing technology, the method of adding fluidized filler or increasing the MBR membrane to concentrate the sludge is used to increase the sludge concentration of the biochemical tank, but these two methods have great defects: one is the fluidized filler added. The quality of the filler itself is not high, the specific surface area is small, and it is difficult to achieve the required sludge concentration; secondly, because the fluidized filler flows with water, it is difficult for the microbial flora to form a degradation gradient, and the bacteria will be seriously homogenized. The degradation efficiency is greatly reduced. If the screen intercepts the fluidized filler, there will be problems of blockage and accumulation, which will affect the uniform distribution of biomass, biological activity and mass transfer efficiency in the biochemical tank. Therefore, the method of adding biological fluidized filler has not been very good. Solve the problems of biological flora succession, biomass and biological activity; third, if the MBR membrane is added to concentrate the sludge, the concentration of the sludge will increase exponentially, but it will also lead to the problems of bacterial aging and poor activity, and the project investment will increase (about 30-40%) and the operating cost of sewage treatment will also increase significantly (about 40-60%), accompanied by membrane clogging and high-cost membrane replacement problems

To sum up, the existing sewage treatment still faces the following three problems: (1) The activated sludge method is limited by the concentration of the sludge, so it cannot expand the capacity in situ and improve the standard. Second, the construction cost is high and it is difficult to realize; (2) the addition of fluidized fillers flows with water, and it is difficult for microbial flora to form a degradation gradient, and the bacteria will be severely homogenized, and the degradation efficiency will be greatly reduced. Moreover, fluidized packing generally has small specific surface area, small biomass, and is easy to clog; (3) increasing the concentration of sludge by MBR membrane will double the concentration of sludge, but it will also lead to the problems of bacterial aging and poor activity. It will increase the cost of construction and operation, and the difficulty of operation is relatively large

Therefore, it is necessary to provide a method that can realize the in-situ upgrading and expansion of municipal sewage to solve the problems of low sludge volume, low biological activity and low mass transfer efficiency in the existing sewage treatment biochemical system

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