Oxidation ditch process with functions of preventing and controlling activated sludge bulking

Abstract

The invention relates to an oxidation ditch process with functions of preventing and controlling activated sludge bulking. The oxidation ditch process is characterized by comprising the following steps of: making sewage enter an anaerobic zone; mixing the sewage with sludge output from a hypoxic preconditioning zone for reacting in the anaerobic zone; making a mixed solution output from the aerobic zone enter an oxidation ditch; reacting the mixed solution in the oxidation ditch, and making the reacted mixed solution enter a secondary precipitation basin through an outflow channel of the oxidation ditch for sludge-water separation; discharging supernatant produced in the secondary precipitation basin from a water outlet; refluxing a part of sludge produced in the secondary precipitation basin into a pre-concentration basin; discharging the residual sludge out of a system; conveying high-concentration sludge formed at the bottom of the pre-concentration basin to a hypoxic preconditioning basin; and conveying supernatant formed on the upper part of the pre-concentration basin to the outflow channel of the oxidation ditch through a supernatant conveying pipeline, mixing with outflow of the oxidation ditch, and making the mixed solution enter the secondary precipitation basin. Due to the adoption of the process, high sludge concentration can be kept in the system, the pollutant removing rate can be remarkably increased, and the common problem of activated sludge bulking existing in the oxidation ditch can be effectively prevented and controlled.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an oxidation ditch process with the function of preventing and controlling activated sludge expansion. Background technique [0002] Oxidation ditch (Oxidation Ditch, OD) is a circulating mixed aeration tank or a circulating mixed activated sludge method, which was first invented by Professor A·Pasveer of the Netherlands National Institute of Health (TND). Since its appearance in 1954, oxidation ditch technology has been extensively researched and developed at home and abroad. Since the 1960s, oxidation ditch has been rapidly promoted and applied in North America, Europe, South Africa and other places, and a number of sewage treatment plants using oxidation ditch technology have been gradually built in China since the 1980s. [0003] The oxidation ditch process has the advantages of fewer operating units, impact load resistance, low sludge production...

AI Technical Summary

Problems solved by technology

[0012] One object of the present invention is to provide an oxidation ditch process with the function of preventing and controlling activated sludge expansion, which can solve the problems that the current oxidation ditch covers a large area and the activated sludge expansion and phosphorus removal effect caused by filamentous bacteria are unstable.

[0014] The invention is a nitrogen and phosphorus removal process with low construction cost, low energy consumption in operation, and good effluent quality, which can solve the problem that the current oxidation ditch covers a large area, and the activated sludge expansion and phosphorus removal effect caused by filamentous bacteria are unstable. problems, can provide technical support for the realization of energy conservation and emission reduction goals in the field of sewage treatment

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