Water plant alum adding control method based on feedforward-feedback composite control

Abstract

The invention provides a water plant alum adding control method based on feedforward-feedback composite control. The water plant alum adding control method comprises a front alum adding part and a rear alum adding part. The front alum adding part comprises the following steps: firstly, establishing a feedforward prediction model and a sedimentation tank effluent turbidity prediction model aiming at the seasonality of raw water quality change so as to obtain a feedforward alum adding amount and a sedimentation tank effluent turbidity prediction value; then, aiming at the dynamic time-varying property of the water quality change of the raw water, correcting the sedimentation tank effluent turbidity prediction value, and calculating the feedback alum adding amount; and finally, carrying out intelligent weighting on the feedforward alum adding amount and the feedback alum adding amount to obtain a front alum adding amount. The rear alum adding part comprises steps: firstly, when the frontalum adding amount and the sedimentation tank effluent turbidity are continuously higher than threshold values within recent 30 minutes through tracking monitoring, starting a rear alum adding process; then, inquiring a relation curve of the sedimentation tank effluent turbidity-rear alum adding amount to obtain a feedforward alum adding amount; then, calculating the feedback alum adding amount; and finally, carrying out intelligent weighting on the feedforward alum adding amount and the feedback alum adding amount to obtain the rear alum adding amount.

Description

technical field [0001] The invention relates to a method for controlling alum addition in a waterworks, in particular to a method for controlling alum addition in a waterworks based on feedforward-feedback composite control. Background technique [0002] The process of adding alum is an important part of water purification in waterworks. The main function of adding alum is to remove harmful substances such as suspended impurities, colloidal particles and bacteria and viruses attached to the colloidal particles in muddy water. According to the U.S. Federal Environmental Protection Agency drinking water virus removal technology standard, when the filtered water turbidity is lower than 0.3NTU, the virus removal rate is as high as 99%. Therefore, during the COVID-19 epidemic, strengthening the effective control of the operation of the alum addition process and strictly limiting the turbidity of the effluent from sedimentation tanks and sand filters is conducive to the effective ...

AI Technical Summary

Problems solved by technology

[0006] According to the process conditions of the research object water plant, the present invention solves the operation control problem of the two-part alum addition process of adding alum before and after adding alum in many water plants in my country, and proposes that the amount of alum added can be quickly adjusted according to the sudden change of the raw water quality and the large hysteresis characteristic can be adapted The feed-forward-feedback compound control method of alum adding process can effectively improve the treatment effect of alum adding process

Images