Method for controlling aeration in biochemical reaction tank in real time

Abstract

The invention discloses a method for controlling aeration in a biochemical reaction tank in real time. The method comprises the following steps of: arranging a monitor at a water inlet end of the reaction tank, in the tank, at a water outlet end and at a sludge reflux port of a sedimentation tank; transmitting water quality and water quantity data acquired by the monitor to a central control system through a PLC (Programmable Logic Controller); calculating oxygen demand, a dissolved oxygen target value and sludge reflux quantity of the biochemical reaction tank by a real-time biochemical reaction model module in the central control system according to the water quality and water quantity data; converting the oxygen demand of the biochemical reaction tank into air supply by an intelligent conversion module; calculating air valve opening and fan pressure data of the reaction tank by an air supply pipe network aerodynamic model module according to the air supply; transmitting the sludge reflux quantity, the air valve opening and the fan pressure data to an executing mechanism by the central control system; and controlling opening and closing of a valve, a fan and a reflux pump by theexecuting mechanism. By applying the method, real-time on-line control over the aeration of the biochemical reaction tank is realized.

Description

technical field [0001] The invention relates to a method for real-time controlling the aeration rate in a biochemical reaction tank. Background technique [0002] The biological treatment process based on the activated sludge method is mostly used in urban sewage. The basic principle is to use artificial aeration to make the activated sludge evenly dispersed and fully contact with the sewage to synthesize and degrade the organic pollutants in the sewage, thereby To achieve the purpose of removing pollutants. [0003] The biological treatment process is the core facility of the sewage treatment plant, and its operation control effect is directly related to the treatment capacity of the entire sewage treatment plant. The biological treatment process is a complex biochemical reaction process. Factors affecting the microbial activity of activated sludge include substrate conditions (such as carbon sources, nitrogen sources, phosphorus sources, toxic chemicals, heavy metal ions,...

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Problems solved by technology

As a result, on the one hand, the energy consumption of the aeration system is increased, and at the same time, too much dissolved oxygen is returned to the anoxic zone, which inhibits the progress of denitrification.

Due to the large nonlinearity and hysteresis between the DO value and the oxygenation amount in the aeration tank, the general control method is easy to cause the DO value to fluctuate, and it is difficult to stabilize the DO value near the target value given in real time, resulting in unsatisfactory treatment effect , and increase the frequency of adjustment of aeration control equipment such as blowers and valves, further increasing equipment loss

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