Volcanic filler-based sewage treatment system of biological aerated filter

Abstract

The invention discloses a volcanic filler-based sewage treatment system of a biological aerated filter, and relates to an advanced treatment method of low-concentration domestic sewage. The advanced treatment method of the low-concentration domestic sewage comprises the steps of pretreatment, anoxic treatment and treatment in the biological aerated filter. The sewage treatment system is based on the volcanic filler; a volcanic filter material has the particle diameter of 4-6 mm, the density of 1.8-2.2 g / cm<3>, the specific area of 8*10<4>-9*10<4> cm<2> / g, the void ratio of 55%-60%, and the intraparticle porosity of 20%-25%. The sewage treatment system disclosed by the invention is a combined technology of physical pretreatment and biochemical treatment and an environmental-friendly energy-saving process technology and has the advantages of high removal ratio on suspended materials, COD (Chemical Oxygen Demand) and ammonia nitrogen, good effect, high anti-impact loading capacity and low investment and operation cost; and according to the volcanic filler-based sewage treatment system disclosed by the invention, treated water can achieve the national 'municipal sewage treatment plant pollution discharge standard (GB18918-2002)'.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage treatment system based on volcanic rock filler aerated biological filter. Background technique [0002] Biological Aerated Filters (Biological Aerated Filters) is a high-load, high-efficiency new sewage treatment process developed on the basis of ordinary biological filters and fully referring to the design ideas of contact oxidation and feedwater filter processes. Due to the simultaneous presence of aerobic and anaerobic areas in the reactor, simultaneous nitrification and denitrification can be realized, and the purpose of denitrification can be achieved while removing COD. The development and progress of my country's sewage treatment industry is relatively late. Since the founding of the People's Republic of China and before the reform and opening up, the demand for my country's sewage treatment is mainly for industrial and national defense cutting-edge applications. ...

AI Technical Summary

Problems solved by technology

[0004] Currently, the commonly used biological aerated filter technology process has a large head loss due to the long flow distance. The filler used is prone to hardening, easy to block, and low oxygen utilization rate. The traditional design process is difficult to replace the filter material and difficult to maintain. convenient

[0005] A similar invention patent (patent number: 200820179393) discloses a biological aerated filter technology for stably distributing water and air. Its disadvantage is that the adsorption performance of the filter material is low, and the removal rate is low under the same conditions. It does not involve the overall treatment process technology. , higher requirements for domestic sewage water quality

[0006] A similar invention patent (patent number: 201020504914) discloses a biological aerated filter technology that improves the backwashing effect. The disadvantage is that the technical process has a small processing capacity and the filling is updated too quickly, resulting in waste.

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