供水系统水质化学稳定性变化及调控策略  

Water Quality Chemical Stability of Water Supply System and Its Control Strategy

作　　者：刘志刚 徐巧[1] 周正协 何建荣 王项荣 李轶 LIU Zhi-gang;XU Qiao;ZHOU Zheng-xie;HE Jian-rong;WANG Xiang-rong;LI Yi(Ningbo Water Environment Group Co.Ltd.,Ningbo 315041,China;College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]宁波市水务环境集团有限公司,浙江宁波315041 [2]河海大学环境学院,江苏南京210098

出　　处：《中国给水排水》2022年第21期45-50,共6页China Water & Wastewater

摘　　要：针对实际净水厂不同水处理工艺对水体水质化学稳定性的影响,研究了净水过程中水质化学稳定性沿程变化规律,并提出了相应调控策略。结果表明,混凝沉淀会明显降低水体水质的化学稳定性,增强腐蚀倾向,超滤和砂滤对水质化学稳定性影响较小,使用次氯酸钠进行消毒能够略微提高水体水质的化学稳定性。当混凝剂聚合氯化铝(PAC)投加量为2 mg/L时,可实现去除浊度和保持化学稳定性的最佳效果;当碱剂Ca(OH)_(2)投加量为4 mg/L时,能够基本实现水体水质的化学稳定性。结合实际案例发现,通过供水区域调度管理、管网冲洗排放、老旧管网改造等措施,能够有效降低供水水源切换引起的管网水质风险,保障管网水质稳定。According to the effect of different water treatment processes on the chemical stability of water quality in water purification plants,the variation law of water quality chemical stability along the process of water purification was investigated,and the corresponding control strategies were proposed.The coagulation and precipitation process significantly reduced the chemical stability of water quality and enhanced the corrosion tendency.The ultrafiltration and sand filtration process had little influence on the chemical stability of water quality,and the use of sodium hypochlorite for disinfection slightly improved the chemical stability of water quality.When the dosage of coagulant polyaluminum chloride(PAC)was 2 mg/L,the best turbidity removal performance and water quality chemical stability were achieved.When the dosage of alkali agent Ca(OH)_(2)was 4 mg/L,the chemical stability of water quality could be basically achieved.According to practical engineering case,the water quality risk caused by water source switching was effectively reduced and the water quality stability of the pipe network was ensured through the measures such as water supply dispatch management in the service area,pipe network flushing and discharge,and old pipe network reconstruction.

关 键 词：供水系统 水质 化学稳定性 调控策略 

分 类 号：TU991[建筑科学—市政工程]