摘要
针对中途补氯后的再生水在输配过程中可能发生水质变化的问题,采用挂片反应器模拟再生水在球墨铸铁管道中输配的过程,通过分析经过不同程度补氯后的再生水的无机性指标及有机物浓度随停留时间的变化规律,考察中途补氯对球墨铸铁管道中再生水水质的影响。试验结果表明,补氯后余氯浓度越高,再生水中余氯衰减速率越小,总铁浓度和浊度随之上升。再生水的pH值随再生水在管道内停留时间的延长呈先升高后趋于稳定的趋势,但补氯后的余氯浓度为10 mg/L时pH值的变化幅度明显小于补氯后余氯浓度为2,5 mg/L时的变化幅度。当补氯后的余氯浓度较高时,再生水中部分有机物可吸附于铁溶出颗粒物上,导致DOC浓度降低。
To investigate the deterioration mechanism of reclaimed water in pipelines after its chlorine supplement process,lab-scale experiments were carried out by submerging cast iron coupons in reactors to simulate the reaction between reclaimed water and pipe.The impact of chlorine supplement on reclaimed water during transport and distribution was investigated by analyzing the variation of inorganic and organic matter under different degrees of chlorine supplement.The results indicate that higher amount of chlorine supplement leads to slower residual chlorine decay rate,and the total iron concentration and turbidity increase accordingly.The pH value of reclaimed water increases and reaches the plateau with extension of residence time.However,when the residual chlorine concentration after chlorine supplement is 10 mg/L,the amplitude of pH variation is significantly smaller than that when the residual chlorine concentration after chlorine supplement is under 2 mg/L or 5 mg/L.The organic matter may partially be absorbed by the particles eluted from the iron coupons,as a result of which the DOC concentration is reduced.
作者
涂杰
衡特
程丽华
胡静
李腾
毕学军
TU Jie;HENG Te;CHENG Lihua;HU Jing;LI Teng;BI Xuejun(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266033,China)
出处
《青岛理工大学学报》
CAS
2021年第4期94-99,共6页
Journal of Qingdao University of Technology
基金
国家重点研发计划项目(2017YFC0403404)。
关键词
再生水
球墨铸铁管道
余氯浓度
输配过程
水质
reclaimed water
ductile cast iron pipeline
residual chlorine concentration
transport and distribution
water quality
