A carbon source dosing feed-forward-feedback control device and control method

Abstract

The invention relates to a carbon source addition feedforward-feedback control device and method. The device comprises a control device, an oxygen-poor zone, an aerobic zone, a secondary sedimentation tank and an advanced treatment unit, wherein the oxygen-poor zone, the aerobic zone, the secondary sedimentation tank and the advanced treatment unit are sequentially connected. An agent adding pool is connected with carbon source addition points through an agent adding pump. The aerobic zone is provided with an internal reflux pipeline which is connected with the oxygen-poor zone. The secondary sedimentation tank is provided with an external reflux pipeline which is connected with the oxygen-poor zone. The carbon source addition feedforward-feedback control device is characterized in that the carbon source addition points include the addition points arranged in the oxygen-poor zone and the advanced treatment unit respectively, the control device comprises detection instruments, a frequency converter and an industrial personal computer, and the detection instruments include the inlet water volume instrument arranged on the inlet of the oxygen-poor zone, the internal reflux flow instrument arranged on the internal influx pipeline, the external reflux flow instrument arranged on the external reflux pipeline, the nitrate nitrogen instruments which are arranged on the outlet of the oxygen-poor zone and the outlet of the secondary sedimentation pool respectively, and the total outlet water and total nitrogen instrument arranged at the outlet of the advanced treatment unit; the industrial personal computer is internally provided with an agent adding pump addition amount control module, a nitrate nitrogen control module, a feed-forward compensation module and a feedback compensation module. The carbon source addition feedforward-feedback control device and method can be widely applied to the sewage disposal process.

Description

technical field [0001] The invention relates to an urban sewage treatment control device and a control method, in particular to a carbon source dosing feedforward-feedback control device and a control method. Background technique [0002] The problems of water environment pollution and eutrophication in my country are becoming more and more serious. Nitrogen is one of the main factors causing eutrophication of water bodies. more harsh. At present, most urban sewage treatment plants in my country adopt the A / O biological denitrification process. The biggest advantage of this process is to use the biodegradable COD (chemical oxygen demand) in the influent as the carbon source for denitrification reaction to remove the nitrogen in the sewage. Nitrogen-containing compounds, the process consists of two steps: 1) nitrification reaction, which converts ammonia nitrogen into nitrite nitrogen or nitrate nitrogen under aerobic conditions; 2) denitrification reaction, which uses organic...

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Problems solved by technology

Due to the obvious fluctuation of the influent load and the hysteresis of the denitrification process, the simple feedback control technology has certain limitations, and it can only have good results when the process operation is relatively stable. Considering that the total nitrogen standard of the effluent is becoming stricter, so Existing technologies are still unable to meet the requirements of stable control and effluent compliance under actual operating conditions

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