Residual chlorine is one of the important indices of the finished water from water treatment plant(WTP).In order to further effectively control residual chlorine in WTP and improve the utilization rate of sodium hypochlorite solution,a multi-feedback control structure had been established in the chlorination after filtration of the sodium hypochlorite dosing system of a WTP in Nantong.A continuous+discrete fuzzy PID control algorithm was designed based on this structure.The improved system could achieve high-precision control of residual chlorine in filtered water of±0.1 mg/L,with low computational load and high portability.Through application comparison,it was shown that the improved system had the advantages of higher operating sensitivity,stronger robustness,no need for human intervention,and higher utilization efficiency of solution compared to the original system,whether under normal or special circumstances.
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