Water plant emergency automatic dosage control system against heavy rainfall in typhoon season

Abstract

The invention discloses a water plant emergency automatic dosage control system against heavy rainfall in a typhoon season. The system comprises a feedforward control system, a PLC (programmable logic controller) system, a metering pump, a mixer, a coagulation sedimentation filter, a clean water tank and a feedback control system, wherein the feedforward control system comprises a flow meter for measuring the water inflow rate and an on-line turbidimeter 1 for measuring turbidity of inflow water; the feedback control system comprises an on-line turbidimeter 2 for measuring the turbidity of the filtered water; the optimum dosage of a coagulant is determined according to the formula Y=(k*Q*(alnx+b)) / (lambda*N). By establishing a mathematical model of coagulant dosage, water inflow rate and water quality, the dosage of the coagulant is minimized on the premise that quality of treated water meets standards, the operating cost of an enterprise is reduced, better economic benefit is achieved, safety of urban drinking water is guaranteed, better social benefit is achieved, the service life of water plant facilities is prolonged, the output of sludge is reduced, and better environmental benefit is achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an emergency automatic dosing control system for a water plant to cope with heavy rainfall in a typhoon season. technical background [0002] Drinking water safety is related to the national economy and people's livelihood. The problem of water resources in China is a matter of supply and demand. Water supply is facing a huge challenge. Almost half of the water sources are polluted to varying degrees. The reason is basically the discharge of pollutants in the upstream of the water source. , such as domestic sewage and industrial wastewater, and agricultural breeding. Therefore, a pollution-free upstream reservoir is the first choice as a drinking water source. For example, all drinking water sources in Ningbo City are reservoirs. The water source of the reservoir is the runoff from the mountains around the reservoir, and the runoff comes from precipitation. W...

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Problems solved by technology

[0003] However, coastal areas, especially Zhejiang and Fujian, are hit by one or several typhoons almost every summer, and each typhoon will bring long-term heavy rainfall. Most of the roads and some buildings in Ningbo were submerged in the flood for a week, which shows the great harm caused by the heavy rainfall brought by the typhoon.

[0004] The long-term heavy rainfall caused by this typhoon will not only wash away or submerge the building facilities, but also wash away the surface soil of the mountain upstream of the reservoir, causing the turbidity of the reservoir to fluctuate violently. For example, in a reservoir in Ningbo, Zhejiang, the annual average turbidity is basically below 6NTU. When heavy rainfall is triggered, the turbidity can reach more than 100 NTU within a day, which is seriously inconsistent with the design of the water plant. Under normal circumstances, the water quality of the reservoir is relatively stable, and the dosage of coagulant is also relatively stable. Basically, it is determined by observing the quality of the effluent water. Regularly fine-tune the dosage of coagulant. If the conventional method of coagulant dosage is adopted, it cannot cope with sudden large fluctuations in water quality, and the effluent from the water plant will be extremely unstable, making it difficult to ensure the safety of drinking water for urban residents.

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