Chemicobiological flocculation treating method for urban sewage with suspending packing bed

Abstract

A process for treating the city sewage features the integration of chemobiotic flocculation integrated deeply for higher efficiency with suspension filler bed loaded by suspended particles as filler for higher microbe concentration in biochemical reactor. Its advantages are high effect, low cost and less possesses ground area.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a chemical biological flocculation-a method for treating urban sewage with a suspended packing bed. Background technique [0002] With the continuous increase of the global population, the continuous development of society, and the continuous acceleration of urbanization, the growth rate of urban sewage volume is alarming. And because urban sewage contains a large amount of inorganic nutrients such as nitrogen and phosphorus, resulting in eutrophication of the receiving water. In the current treatment of urban sewage, the activated sludge method is absolutely dominant. The traditional activated sludge method does not have the function of nitrogen and phosphorus removal. Based on the theory of biological aerobic nitrification, anoxic denitrification and anaerobic phosphorus release, aerobic excess phosphorus uptake, a series of activated sludge for bio...

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Problems solved by technology

[0004] This is the most widely studied and applied biological nitrogen and phosphorus removal process. Its main structures include anoxic reactors, anaerobic reactors, and aerobic reactors. Research and actual engineering experience show that its nitrogen The removal effect of elements is good, and the ability to remove organic matter is very stable, but it has the following defects: (1) There are many pools, and a lot of connected pipes are added; (2) The hydraulic retention time is long, the treatment pool is large, and the infrastructure The cost is high, and the floor area is also increased; (3) There are many return systems, many and scattered equipment, complex operation and management, and high requirements for the quality of operators; (4) The treatment effect largely depends on the quality of the influent water, When the water quality fluctuates, the treatment effect cannot be guaranteed, and it is not resistant to impact load; (5) the energy consumption is high, which increases the operating cost; (6) the phosphorus removal effect is unstable, and the standard cannot be guaranteed

It creates anoxic, anaerobic and aerobic environments in time series to provide conditions for the growth of nitrogen and phosphorus removal microorganisms. Its advantage is a single-pool system, which can be automatically controlled by a time relay. Research and engineering practice show that It has some defects as follows: (1) due to intermittent operation, this process is not suitable for large-scale urban sewage treatment projects; The treatment effect of phosphorus is not ideal, and it is rare to reach the standard at the same time; (3) The hydraulic retention time is long, the treatment tank is large in size, the capital construction cost is high, and the floor area is also increased; (4) The treatment effect is largely dependent on the processing Water quality, when the water quality fluctuates, the treatment effect cannot be guaranteed

Research and engineering practice show that this process has a good phosphorus removal effect and is not affected by the quality of influent water, but it has the following defects: (1) It needs to increase special reactors and equipment, which increases infrastructure costs; (2) Increases the cost of The complexity of operation management requires high technical level of operators; (3) Lime is used, and there are many problems in its storage and preparation system; (4) The amount of sludge increases greatly due to the addition of lime, and the processing cost increases

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