摘要
水质稳定性是影响饮用水管道输送和日常使用的重要因素,部分水厂原水由于总硬度、总碱度含量较高而呈现较明显的结垢倾向,需要进行处理。以LC水厂原水为研究对象,考察诱晶软化技术对原水结垢倾向的控制效果,并分析作用机制。结果表明,水厂原水结垢倾向严重,且有加剧趋势,结垢成分以CaCO_(3)为主,并掺杂有少量硅、镁等成分;诱晶软化技术可有效降低原水结垢倾向。当软化药剂投加量为10 mg/L时,原水的结垢倾向基本被消除,管道输送过程中无明显结垢现象;水中离子组分分析结果表明,结垢倾向的降低主要缘于水中钙离子及重碳酸根含量的降低,出现碳酸钙沉淀晶体的几率显著降低。连续运行试验结果表明,诱晶软化技术对结垢倾向的控制效果稳定,且能一定程度上提升水厂出水水质,直接运行成本(包括动力费和药剂费)可控制在0.05元/m^(3)左右。综上,诱晶软化技术可以作为控制水厂原水结垢倾向的备选技术之一。
Water quality stability is an important factor affecting drinking water pipeline transportation and daily use.Due to the high total hardness and total alkalinity,raw water of some water treatment plants has obvious scaling tendency,which needs to be treated.Therefore,control effect of induced crystal softening technology on raw water scaling tendency in LC water treatment plant was investigated,and the mechanism was analyzed.The raw water scaling tendency in the water treatment plant was serious and had a tendency of aggravation.The scaling component was mainly CaCO_(3)with a small amount of silicon,magnesium and other components.The induced crystal softening technology could effectively reduce the scaling tendency.When the softening agent dosage was 10 mg/L,the scaling tendency of raw water was basically eliminated,and there was no obvious scaling phenomenon during pipeline transportation.Ion composition in the water showed that the decrease of scaling tendency was mainly due to the obvious reduction of calcium ion and bicarbonate ion content and the occurrence of calcium carbonate crystal precipitation was significantly reduced.The continuous operation results showed that the treatment performance of the device was stable and the product water quality could be improved to a certain extent.Direct operational cost(including power and reagent costs)was about 0.05 yuan/m^(3).In conclusion,induced crystallization softening technology can be used as one of the alternative technologies to control drinking water scaling tendency.
作者
李长庚
刘成
武海霞
邱超
刘念爱
LI Chang-geng;LIU Cheng;WU Hai-xia;QIU Chao;LIU Nian-ai(School of Environment,Hohai University,Nanjing 210098,China;Jiangsu Heqinghaiyan Environment Co.Ltd.,Suqian 223800,China;Suqian Research Institute of Hohai University,Suqian 223800,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2021年第13期54-59,共6页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2015ZX07406-005)。
关键词
水质化学稳定性
诱晶软化技术
结垢倾向
硬度
chemical stability of water quality
induced crystal softening technology
scaling tendency
hardness
