Automatic dosing control system of coagulant and operation method

Abstract

The invention discloses an automatic dosing control system of a coagulant and an operation method, which belong to the field of waste water treatment. The automatic dosing control system of the coagulant comprises a feedforward control system, a PLC control system, a metering pump, a mixer and a filter tank, wherein, the feedforward control system is arranged at a waste water inlet and consists of a flowmeter, an on-line TP analyzer and an on-line SS determination instrument. The invention further provides the operation method based on the system, which mainly comprises the following steps: using the feedforward control system for determining the flow rate of waste water and the TP and the SS concentration before the waste water treatment, feeding the determination result forward to the PLC control system, and using the PLC control system to timely adjust the adding amount of the coagulant according to the feedforward of the flow rate, the TP and the SS of the feedforward control system, parameters to be determined in the formula that X medicine is equal to k*Q*L*(P minus A)*(S minus B) / (lambda*N) and the coagulation effect of the waste water treatment, thereby ensuring the using amount of the coagulant to achieve the optimal using amount and ensuring the water treatment effect.

Description

technical field [0001] The invention relates to a sewage treatment system and method, in particular to an automatic dosing control system and an operation method for micro-flocculation filtration or coagulation sedimentation filtration. Background technique [0002] At present, the whole world is facing the problem of shortage of water resources. As a limited resource, the recycling of water, that is, the advanced treatment of sewage, has become the only way to solve the problem. [0003] Research and development of economical and efficient sewage advanced treatment technology has urgent practical significance for reducing the total amount of pollutants, improving the water environment, creating a good water environment and improving people's quality of life. Advanced treatment generally adopts micro-flocculation filtration or coagulation-sedimentation filtration process to further remove the main pollutants in the secondary effluent, and the coagulant added is the main oper...

AI Technical Summary

Problems solved by technology

Advanced treatment generally adopts micro-flocculation filtration or coagulation-sedimentation filtration process to further remove the main pollutants in the secondary effluent, and the coagulant added is the main operating cost of micro-flocculation filtration or coagulation-sedimentation filtration process. The dosing system only determines the dosage of coagulant according to the influent flow and turbidity. However, adding coagulant for filtration not only removes turbidity, but also has the effect on total phosphorus (TP) and suspended solids (SS). Very good removal effect, and TP and SS are the most important indicators that cannot meet the standard A standard of the comprehensive discharge standard of sewage in the secondary effluent of the sewage plant, and are very unstable, so too little coagulant is added and the effluent cannot reach the standard. Standard, excessive coagulant dosage will not only waste, but also generate a lot of sludge

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