Device and method for enhancing denitrification and dephosphorization of composite medium multi-stage aeration biological filtering tank

Abstract

The invention provides a device and a method for enhancing denitrification and dephosphorization of a composite medium multi-stage aeration biological filtering tank and belongs to the field of sewagetreatment materials. The device comprises a first-stage filtering column, a second-stage filtering column, a third-stage filtering column and a fourth-stage filtering column, wherein a water inlet ofthe first-stage filtering column is connected with a to-be-treated sewage inlet; the first-stage filtering column, the second-stage filtering column, the third-stage filtering column and the fourth-stage filtering column are successively connected with each other through submersible pumps in intermediate water tanks; a water outlet of the fourth-stage filtering column is emptied by an eighth valve. The method is characterized by enhancing film formation of the second-stage filtering column, and successively filtering through the first-stage filtering column, the second-stage filtering column,the third-stage filtering column and the fourth-stage filtering column. The device and the method are capable of enhancing denitrification and dephosphorization; the application efficiency of BAF isgreatly improved; the deep denitrification and dephosphorization effect of the filtering tank is emphatically enhanced; the device and the method have the advantages of good filtering effect, strong denitrification and dephosphorization effect, convenience in management, low cost and low head loss.

Description

technical field [0001] The invention belongs to the field of sewage treatment materials, and in particular relates to a device and method for enhancing denitrification and dephosphorization of composite medium multistage aerated biological filters. Background technique [0002] In my country's sewage reuse, more traditional treatment processes such as coagulation sedimentation, sand filtration, activated carbon adsorption technology, biological filtration technology, membrane separation technology and deep nitrogen and phosphorus removal technology are still used. This process technology is mature, the removal rate of colloidal impurities is high, and the effluent can meet the requirements of users in most cases, but this process has the following disadvantages: long treatment process, large investment in infrastructure construction, high drug consumption, and high operating costs. , The removal ability of ammonia nitrogen is not strong. With the introduction of more stringe...

AI Technical Summary

Problems solved by technology

This process technology is mature, the removal rate of colloidal impurities is high, and the effluent can meet the requirements of users in most cases, but this process has the following disadvantages: long treatment process, large investment in infrastructure construction, high drug consumption, and high operating costs. , The removal ability of ammonia nitrogen is not strong. With the introduction of more stringent water quality standards for sewage reuse, this process is increasingly unable to meet the requirements of users. When using activated carbon adsorption, membrane separation and other treatment processes, it is also faced with the long treatment process. , high operating costs, difficult maintenance, etc.

The water quality standard achieved by most recycling processes is low, so it is easy to cause problems such as industrial reuse damages the water system, landscape reuse seriously eutrophicates, agricultural irrigation reuse pollutes groundwater, and even affects people's health. Difficult to guarantee security

[0005] (2) Economic issues

The advanced treatment process requires large investment and high operating costs, so the price of reused water has no advantage compared with tap water, which is difficult for users to accept and seriously affects the promotion and application of sewage reuse

[0006] (3) Practical issues (universal applicability)

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