A<2>/O oxidation ditch process operation control method

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for operating and controlling an A<2> / O oxidation ditch process. The method comprises: the sewage orderly flows through an anaerobic tank, an anoxic tank and an oxidation ditch aeration tank and finally enters a secondary sedimentation tank, and supernatant fluid is discharged by sludge-water separation; and the oxidation ditch aeration tank adopts an intermittent aeration mode. The prior oxidation ditch aeration tank adopts the continuous aeration mode, and the water flow state in the oxidation ditch is the perfect mixing mode, so that the reaction efficiency of the prior oxidation ditch aeration tank is relatively low. According to the technical proposal, because the oxidation ditch aeration tank of the invention adopts the intermittent aeration mode, the reaction is easily controlled, and the reaction efficiency and the substrate concentration in the oxidation ditch are greatly improved, thereby improving the nitrification efficiency and oxygen utilization efficiency at the nitrifying stage, improving the denitrification efficiency, simultaneously lowering oxygen consumption, and greatly lowering energy consumption of the oxidation ditch.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a 2 / O oxidation ditch process operation control method. Background technique [0002] In recent years, the effluent water quality standards of sewage treatment plants are gradually improving, and the investment and operating costs of sewage treatment plants are increasingly widely concerned. Therefore, it is imperative to optimize the control of sewage treatment methods in sewage treatment plants. At present, the control methods adopted by sewage treatment plants for their sewage treatment methods are as follows: 1. Use the control parameters recommended in the design manual for control; 2. Use DO (dissolved oxygen concentration) in the aeration tank as the control parameter to control Control the aeration amount; 3. Control the aeration amount according to the actual water load. [0003] For the first control method, because most of the existing sewage treatment plan...

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Problems solved by technology

[0003] For the first control method, because most of the existing sewage treatment plants have a high design load, or the amount of water treated in the actual operation process is small, or the actual pollutant concentration in the sewage is less than the design value during most of the operation time of the sewage treatment plant , so if the first control method is adopted, that is, to control the sewage treatment plant according to the control parameters recommended in the design manual, it will inevitably lead to high energy consumption, and at the same time, the removal rate of TN (total nitrogen content) is low, and the sludge Aging and high SS (suspended solids concentration) in the effluent

[0004] As for the second control method, it is not suitable for sewage treatment plants using the oxidation ditch process, because in the oxidation ditch process, the DO at different locations is not the same, and because the water inflow is more complicated, the DO at the same place at different times DO is also different, so using the range of DO given in the design manual to control the actual operation of the sewage treatment plant using the oxidation ditch process is not completely applicable

[0005] As for the third control method, it is originally an ideal method, but due to the complicated water situation of the sewage treatment plant, the water quantity and water quality in the next period are difficult to predict, especially the detection of water quality is lagging behind. Therefore, it is difficult to control the sewage treatment plant according to the actual influent load in practice.

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