Biological sieving tower for wastewater treatment

Abstract

A biological tower applied to sewage disposal includes a tower body(1), an inlet branch (2), a water distribution device communicated with the inlet branch (2),a biological filler area (4) and a pedestal (5); wherein, the biological filler area (4) is arranged on the whole tower body (1) while the water distribution device is arranged on the upward side of the biological filler area (4) and a filler supporting net is arranged between the top plate surface of the pedestal (5) and the biological filler area (4); while the pedestal (5) includes a top plate, a bottom plate (52) and a side wall (53) encircling between the top plate and the bottom plate. The top plate of the pedestal (5) is provided with a through hole (51a). The upper part of the side wall (53) of the pedestal (5) is provided with a through hole (53b) and the bottom part is provided with a water outlet (53c). Compared with the prior art, the biological tower of the present invention adopts the purifying mode of natural flow from up to down to lead the tower to consume lower energy. The present invention has the advantages of very simple monolithic structure and fewer parts. The present invention has greatly reduced construction lost and is more suitable for practical application.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a biological filter tower for sewage treatment. Background technique [0002] With the continuous shortage of water resources and the continuous strengthening of environmental pollution control, people have begun to pay attention to the treatment of various sewage and reuse it as much as possible. At present, the devices for treating urban domestic sewage can be roughly divided into activated sludge filter tanks, biological filter tanks, biological contact oxidation filter towers, etc. Among them, the filter tanks occupy a large area because they need to be carried out step by step. Therefore, there are defects such as scattered structure, large space occupation, high investment cost, long filtration cycle, complex operation and management, etc., and it has not been well promoted and popularized, which restricts the development of current urban sewage treatment work. ...

AI Technical Summary

Problems solved by technology

[0004] The biological filter tower has the following defects: first, in the tower body of the biological filter tower, the pressure of the sewage above the bottom plate is obviously much stronger than the pressure of the clear water in the top clarification area, and the sewage must be gradually imported into the lower part of the tower body It is necessary to make the sewage have a relatively high pressure. Generally, a water pump is used to drive the sewage into the tower body. Therefore, the purification method of the sewage flowing from the bottom to the top must consume a lot of energy; secondly, although the biological The filter tower can make the distribution of sewage under the biological filling area more uniform by improving the water distributor, but when filtering, the sewage overflows from bottom to top, and the flow direction of the sewage after it is output from the water distributor cannot be controlled at all. It is easy to cause uneven distribution of sewage in the biological packing, which will affect the degree of full contact between sewage and biological packing, thereby reducing the sewage purification rate of the biological filter tower; third, in the lower part of the tower body, the sewage distribution layer, gas distribution layer The system layer takes up a large space. Relatively speaking, for the tower body of the same size, the biological packing layer, the substantive area that is really used for purification, has a relatively small space, so the space utilization rate in the tower body is not high; Fourth, the tower body of the biological filter tower is filled with water, and the tower body must be sealed relative to the outside except for the top opening, and oxygen must be present for the biological reaction between the sewage and the biological filler, and the oxygen in the biological filter tower must be provided by another The components are supplied, that is, the air distribution system, which directly increases the construction cost of the biological filter tower, and the structure of the air distribution system is relatively complicated, and the arrangement and installation in the tower body increases the difficulty of the construction of the biological filter tower, which is not easy to implement in practice , and the air distribution system covers the water inlet pipe, water distributor, sludge discharge pipe and other components, which is very unfavorable for the maintenance and repair of the biological filter tower

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