A/O denitrification sewage treatment process and device capable of realizing sludge reduction

Abstract

The invention relates to an A / O denitrification sewage treatment process and a device capable of realizing sludge reduction. The process comprises the following steps: leading sewage in an anoxic zone to realize denitrification and then leading the treated sewage in an aeration zone to carry out aeration treatment; pumping part aerated sewage to the upper part of the anoxic zone to realize refluxing of mixed solution; leading residual sewage in a deposition zone to realize sludge-water separation through natural deposition; and pumping part deposited sludge to a sludge detention tank according to sludge refluxing ratio and then pumping the part deposited sludge to the upper part of the anoxic zone after 5.0 to 8.0 hours of detention to realize sludge refluxing. The A / O denitrification sewage treatment process and the device have the advantages that the process effectively combines sewage denitrification treatment and sludge reduction and has the advantages of both A / O denitrification process and OSA process, thereby realizing sludge reduction while ensuring effluent water quality; meanwhile, the process has simple flow and reduces material consumption and energy consumption; moreover, the process saves investment and does not cause potential problems in environmental safety; and the device has low investment and operation cost and convenient operation management.

Description

technical field [0001] The invention relates to a combined process and device for sewage treatment, which belongs to the technical field of sewage treatment and environmental protection, and is particularly suitable for the sewage treatment process requiring sludge reduction and the reconstruction of sewage treatment plants using the A / O denitrification process at the present stage . Background technique [0002] The activated sludge method is the most common sewage treatment process, and the treatment effect is good, but the biggest disadvantage is the high sludge output. Sludge usually contains a considerable amount of toxic and harmful substances and unstabilized organic matter, which is not only difficult to deal with, but also poses a direct or potential threat to the environment, and the cost of treatment and disposal is relatively high, generally accounting for 50-50% of the operating cost of the entire plant. 60%. Therefore, it is necessary to develop a sewage trea...

AI Technical Summary

Problems solved by technology

Among the existing sewage treatment methods, the biological denitrification is mostly based on the A / O process. The production practice has been widely used and the technology is relatively mature. However, the A / O process also has the disadvantages common to the activated sludge process: sludge The output is high, and there is still a gap in the research of its sludge reduction combined system

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