复合沉淀法去除地表原水中的硫酸盐及硬度  

Removal of Sulfate and Hardness in Surface Raw Water Using a Complex Precipitation Process

作　　者：艾恒雨[1] 韩璐[1] 汪明明 

机构地区：[1]哈尔滨理工大学化学与环境工程学院,黑龙江哈尔滨150040 [2]南京市市政设计研究院有限责任公司,江苏南京210005

出　　处：《中国给水排水》2018年第1期48-51,共4页China Water & Wastewater

摘　　要：采用分步投加聚合氯化铝(PAC)、氯化铝和氧化钙(或氢氧化钙)形成复合沉淀物的方法同时去除地表原水中的硫酸盐和硬度,考察了药剂种类和投加量对去除效果的影响。结果表明,当PAC、Al Cl3·6H2O和Ca(OH)2(以Ca O计)投加量分别为30、30和100 mg/L时,对硫酸盐和硬度的去除率分别可达37%~45%和32%~41%,并且反应过程中必须有Al3+参与,其最佳使用量为30~40 mg/L(以Al Cl3·6H2O计),反应生成的沉淀物主要成分为CamAln(SO4)x(OH)y·z H2O。复合沉淀法可使出水中的硫酸盐和硬度满足生活饮用水标准。Composite precipitation, formed by adding polyaluminum cloride （PAC）, aluminum chloride, and calcium oxide （or calcium hydroxide） into the flocculation tank, could remove sulfate and hardness simultaneously. The effect of the type and dosage of the chemical agent on the removal rate was investigated. The experimental results showed that when PAC, AlCl3·6H2O, and Ca（OH） 2 （calculated by CaO） dosage were 30 mg/L, 30 mg/L, and 100 mg/L, respectively, removal rates of sulfate and hardness reached 37% -45% and 32% -41% respectively. Al^3＋ was necessary in the process with an optimum dosage of 30 -40 mg/L （calculated by AlCl3·6H2O） , and the reaction product was mainly composed of CamAln（SO4）x（OH）y·zH2O. The sulfate concentration and the hardness of the effluent could meet the drinking water standard.

关 键 词：复合沉淀法 硫酸根 硬度 地表原水 

分 类 号：TU991[建筑科学—市政工程]