环状管网模拟余氯衰减模型

Simulation of Residual Chlorine Decay by Pipe Loop Reactor

在环状管网反应器中模拟配水管网余氯衰减模型,考察了初始氯浓度、流速、管径和pH对余氯衰减系数的影响。通过大量的试验数据经拟合比较发现,一级衰减模型可以很好地预测实测值,该模型预测余氯衰减的相关系数>0.95,模拟精确度能够满足实际工程需要。初始氯浓度、管径、pH与衰减系数成反比,流速与衰减系数成正比。在普通铸铁管中,管径越大则衰减系数受流速的影响越小,受pH的影响越大;余氯的衰减主要发生在与管壁的反应中,pH是影响普通铸铁管中余氯衰减的主要因素,适当调节出厂水的pH值是改善管网水质的有效手段。

Pipe loop reactor was used to evaluate the residual chlorine decay rates in distribution systems. It is found that chlorine decay mainly occurs on pipe wall. Based on a great deal of laboratory data, a first-order chlorine decay model is presented. The first-order model has a correlation coefficient above 0.95 in predicting the residual chlorine decay. Pipe diameter, initial chlorine concentration, water velocity, and pH that affected chlorine decay were investigated. The results indicate that the chlorine decay coefficient has an inverse proportion with initial chlorine concentration, pipe diameter and pH. And it has a direct proportion with water velocity. It is found that pH is the primary effecting factor on chlorine decay. So adequately increasing pH value of the effluent is the effective way to control the water quality in distribution systems.