Intermittent aerating biological filter seprobia dephosphorization technique

Abstract

The invention relates to a dephosphorization technique for sewage organisms in an intermittent air-exposition biologic filtering pond, with the adoption of a sewage treatment system orderly consisting of a fixed bed anaerobic biologic filtering pond and an intermittent air-exposition biologic filtering pond. The intermittent air-exposition biologic filtering pond discharges an anaerobic reaction liquid rich in phosphor, namely, the anaerobic liquid rich in phosphor, when the anaerobic phase comes to an end, and the water is taken in continuously during the aerobic phase. Two intermittent air-exposition biologic ponds are aligned, and two filtering ponds are crossed for work. Each intermittent air-exposition biologic pond circularly works according to the time limit of the arranged intermittent air exposition period, and the whole system achieves the continuous water intake and outtake. The technique has simple and convenient operation and lowoperational cost, and can effectively eliminate the phosphor in the sewage. Compared with the prior dephosphorization technique, the invention adopts the method of the discharge of the anaerobic liquid rich in phosphor rather than the aerobic biologic cells rich in phosphor to remove the phosphor in the intermittent air-exposition biologic filtering pond. The dephosphorization property of the reactor does not depend on the anti-washing, the work period of the reactor is effectively prolonged, and the energy consumption during the anti-washing of the filtering pond is reduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a biological phosphorus removal technology for sewage. Background technique [0002] Biological aerated filter has good carbon oxidation and nitrogen oxidation capacity, but the removal effect on phosphorus is not good. Because the biological aerated filter does not have the environmental conditions required for the growth of phosphorus-accumulating bacteria, the removal of phosphorus is mainly achieved through the growth and metabolism of microorganisms or the physical interception of the filter layer, and the removal rate is low. And by providing non-aerated / aerated environmental conditions alternately in the biofilter, phosphorus-accumulating bacteria can be enriched in the reactor. The reason is that in the process of anaerobic / aerobic biological phosphorus removal, phosphorus accumulating bacteria can quickly absorb organic substrates and store polyhydroxyalkanoi...

AI Technical Summary

Problems solved by technology

Therefore, frequent backwashing process is very necessary for the effective phosphorus removal of biofilm reactors, but this will increase the energy consumption of backwashing and interfere with the operation of the system

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