Intelligent dissolved oxygen control sewage treatment energy-saving system and method

Abstract

The invention discloses an intelligent dissolved oxygen control sewage treatment energy-saving system and method. The system comprises an aeration tank, a dissolved oxygen robot is erected in the aeration tank, the output end of the dissolved oxygen robot is connected with the input end of an intelligent PLC, and the output end of the intelligent PLC is connected with the input end of a frequency converter; and the output end of the frequency converter is connected with the input end of the air blower, and the output end of the air blower is connected with the aeration tank. The dissolved oxygen robot is used for carrying out linear acquisition on the whole aeration tank, dissolved oxygen of each section of the aeration tank is tested, operation data is formed to judge an effluent dissolved oxygen value, and then the effluent dissolved oxygen value is fed back to the fan for active adjustment. No lag and sensitive reaction are realized. The operation efficiency is greatly improved, energy conservation is achieved, the operation risk is reduced, the water outlet stability is improved, and the system and the method are suitable for various complex operation processes and scenes and wider in application range.

Description

technical field [0001] The invention relates to the field of energy saving and environmental protection, in particular to an intelligent dissolved oxygen control sewage treatment energy saving system and a method thereof. Background technique [0002] Domestic municipal sewage treatment plants generally adopt biological treatment process, which is a complex biochemical process, and aeration control (dissolved oxygen control) is one of the very important process sections. Different processes have different aeration control methods, but in almost all sewage plants using biological treatment processes, the aeration unit is always the most important energy consumption link. Through big data analysis, the aeration power consumption of the sewage plant accounts for 50%-70% of the total power consumption of the whole plant, so the aeration system is a key link in the energy-saving and consumption-reducing operation of the entire sewage plant. [0003] It has always been a difficul...

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Problems solved by technology

[0003] It has always been a difficult technology to control the dissolved oxygen value in the aerobic tank of the sewage plant. The control of dissolved oxygen is basically based on human operation experience. The existing technology is basically to set up a dissolved oxygen tester at a fixed point to control the dissolved oxygen in the aerobic tank and then feed back As for the fan, the dissolved oxygen in the outlet water can be controlled by adjusting the air volume of the fan or by controlling the opening of the valve. This fixed point method only tests points or surfaces, and cannot effectively control the dissolved oxygen of the entire system. Its biggest problem It is test-adjustment-retest (to test the effect of adjustment). In theory, the more points tested, the more accurate the value can be, resulting in a great increase in investment. When controlling dissolved oxygen, in order to accurately control the point It also needs to use a large number of control valves, which is very expensive, resulting in a waste of energy and a lag in adjusting dissolved oxygen

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