石灰沉淀法除砷的影响因素  

Influencing factors of arsenic removal by lime precipitation

作　　者：黄自力[1] 刘缘缘[1] 陶青英[1] 耿晨晨[1] 何甜辉[1] 

机构地区：[1]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,武汉430081

出　　处：《环境工程学报》2012年第3期734-738,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50904047)

摘　　要：以Ca(OH)2溶液为沉淀剂,处理模拟含砷废水砷酸钠溶液,考察了pH值、Ca/As摩尔比、自由沉降时间和反应温度等因素对石灰沉淀法除砷效果的影响。结果表明,在pH值为12,Ca/As摩尔比为6,沉降时间为48 h,反应温度为25℃时,石灰沉淀法除砷的效率可达到99.05%;此外,对高浓度的含砷废水,在石灰沉淀法除砷工艺中添加简单无机盐絮凝工艺,可显著降低出水总砷浓度,达到污水综合排放标准的要求。With the Ca（OH）2 solution for precipitation agent and the sodium arsenate solution for simulation arsenic water,the effects of pH,the Ca/As molar rations,the precipitate time and the temperature on arsenic removal by lime precipitation were studied.The results showed that,while controlling the pH was 12,the mole ratio of Ca/As was 6,the time of precipitate was 48 hours and the temperature was 25 ℃,the removal rate of arsenic rose to 99.05%.Besides,when adding the inorganic flocculants to high concentration of arsenic wastewater treated with Ca（OH）2 solution,the effluent concentration of arsenic wastewater could be significantly reduced,then met the requirements of integrated wastewater discharge standard.

关 键 词：石灰沉淀 PH值 Ca/As摩尔比 无机絮凝剂 

分 类 号：X703[环境科学与工程—环境工程]