摘要
自来水煮沸后饮用是我国居民重要的饮水习惯,而煮沸后的“水垢”问题给供水企业和用户造成困扰。研究结合南京地区水源水质特征、现有处理工艺及“水垢”控制需求,结合“水垢”的生成反应及影响因素,探究适用于低硬度饮用水的有效“水垢”控制方法。结果表明,南京地区水源水质整体较好,且水厂均设置了深度处理工艺,可以较好地保证供水水质安全,目前比较典型的是基于“水垢”的感官水质问题。改良型诱导结晶软化工艺对煮沸后“水垢”具有较好的控制作用,软化药剂投加量宜控制在10~20 mg,投加二氧化碳回调pH,处理出水煮沸后则完全没有“水垢”,沸后水的总硬度也没有降低,且多次煮沸也没有“水垢”生成,工艺总运行费用可控制在0.06元/m^(3)左右。
Drinking boiled tap water is an important drinking habit among residents in China,but the issue of"scale"generated after boiling poses challenges for both water supply companies and users.This study combined the characteristics of water source,existing treatment processes and the demand for"scale"control in the Nanjing region.By considering the generation reactions and influencing factors of"scale",it explored effective methods for controlling"scale"in low-hardness drinking water.The results indicated that the overall water quality of the Nanjing region was good,and water treatment plants had established advanced treatment processes to ensure the safety of water supply.Curently,the typical water quality issue was related to"scale".The improved induced crystallization sofening process had a good control effect on"scale"after boiling.The dosage of softening agent should be controlled at around 10 to 20 mg,and carbon dioxide should be added to adjust the pH.After treatment,there was no"scale"in the boiled water,and the total hardness of the water after boiling remains unchanged.Additionally,"scale"was not generated even after multiple boilings.The total operating cost of the process could be controlled to around 0.06 yuan/m^(2).
作者
刘振东
徐文蕙
周冰洁
李海兵
刘成
陈卫
LIU Zhendong;XU Wenhui;ZHOU Bingjie;LI Haibing;LIU Cheng;CHEN Wei(Nanjing Water Group,Nanjing210091,China;School of Environment,Hohai University,Nanjing 210098,China)
出处
《净水技术》
CAS
2024年第S01期21-28,共8页
Water Purification Technology
基金
国家重点研发计划项目:高品质饮用水净化新型纳滤膜材料制备及分离技术研究与应用示范(2023YFC3208004)。
关键词
饮用水
总硬度
水垢
控垢
适用技术
南京
drinking water
total hardness
scale
scale control
applicable technology
Nanjing
