Biological aerated filter system and its sewage treatment method

Abstract

The invention discloses a biological aerated filter system and a sewage treatment method thereof. The biological aerated filter system is connected with a first-stage water treatment system, and is provided with a water inlet with a water intake valve, and a water outlet with a water discharge valve. The biological aerated filter system at least comprises a biological aerated filter group for treating sewage discharged from the first-stage water treatment system, a backwash fan, and an automatic control device, wherein the first biological aerated filter group at least comprises a plurality of down-flow biological aerated filters and up-flow biological aerated filters, which are adjacently connected sequentially in series; the backwash fan provides wind to adjust the aeration rate and the backwash aeration rate of each biological aerated filter in the system; the automatic control device controls the backwash fan to adjust the aeration rate of the biological aerated filter and opening and closing of the water intake valve and the water discharge valve. By adopting the method, the sewage sequentially passes through the plurality of biological aerated filters connected in series; the plurality of biological aerated filters are utilized to carry out interval treatment in an anoxic condition and an aerobic condition, so as to output qualified sewage.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a biological aerated filter system for sewage recycling and advanced treatment of sewage and a sewage treatment method using the system. Background technique [0002] With the development of science and technology, industrial and domestic water consumption is increasing day by day, but water resources are limited, so sewage recycling is an extremely necessary process, which can relieve water pressure to a certain extent. In the field of sewage treatment, in addition to traditional physical methods, including adsorption method, air flotation separation method, electromagnetic effect method, etc., there are also physical chemical methods and chemical oxidation methods. However, the above methods cannot achieve good results. Therefore, in order to improve the quality of water treatment, the biofilm method has been rapidly developed. The main principle is to form a film through the gr...

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Problems solved by technology

However, the above methods cannot achieve good results. Therefore, in order to improve the quality of water treatment, the biofilm method has been rapidly developed. The main principle is to form a film through the growth of microorganisms attached to the surface of the carrier, and the sewage flows through the surface of the carrier to contact the biofilm. During the process, the organic pollutants in the sewage are adsorbed, stabilized and oxidized by microorganisms, and finally converted into H 2 O.CO 2 , NH 3 and microbial cell matter to purify sewage

The biofilm method is currently mostly used for secondary biological treatment in sewage, and in the biofilm treatment process, the biofilter is the most representative structural form. According to whether the biofilter needs oxygen supply during operation, the biofilter It can be divided into anaerobic biological filter and aerobic biological filter. The advantages of anaerobic biological filter are: high organic matter removal efficiency, low SS of effluent suspended matter, stable operation, easy management, and the existence of anaerobic biological filter. The main problem is that the water distribution is not easy to be uniform, and the filter material is easy to block

In the aerobic biological filter, according to the structure of the filter, the way of oxygen supply and whether it has a backwash system, the aerobic biological filter is also called the ordinary biological filter. The advantage of the ordinary biological filter is the biochemical oxygen demand (BOD) The removal rate is high, but the disadvantage is that it occupies a large area, is easy to block, and there are many gray flies, which affects environmental sanitation

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