硅酸钙微粉吸附预处理焦化废水中COD和NH_3-N的实验研究  

Research on pre-treatment of COD and NH_3-N in coking wastewater by adsorption on calcium silicate

作　　者：郭婷[1] 韩剑宏[1] 刘派[2] 张战军 孙俊民 

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]华南理工大学轻工与食品学院,广东广州510006 [3]大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心,内蒙古呼和浩特010050

出　　处：《环境污染与防治》2013年第4期57-61,共5页Environmental Pollution & Control

基　　金：国家科技支撑计划项目(No.2009BAB49B02)

摘　　要：首次将固体废弃物硅酸钙微粉用于焦化废水的预处理,通过静态和动态吸附实验评价了硅酸钙微粉对COD和NH3-N的去除效果。结果表明:对COD和NH3-N产生吸附作用的有效组分为硅酸钙微粉的水解产物H2SiO3电离产生的HSiO3-和SiO23-;pH通过影响硅酸钙微粉水解反应以及水解产物H2SiO3和有机物、NH3的电离反应来影响去除率。在进水pH=7.00、硅酸钙微粉投加量为170g/L、振荡时间为75min的条件下,静态吸附实验中COD和NH3-N的去除率分别达16.1%和27.1%;经直径为10mm、高度为300mm的硅酸钙吸附柱预处理,动态吸附实验中COD和NH3-N的去除率分别可达58.9%和35.9%。The solid waste, calcium silicate, was first reutilized as absorbent for the pre-treatment of coking wastewater. Both static and dynamic adsorption experiments were carried out to evaluate the adsorption capacity of calcium silicate for COD and NH3-N in coking wastewater. The results showed that the effective components for COD and NH3-N adsorption were HSiO3- and SiO32- , the ionization products of H2 SiO3, and H2SiO3 was the hydrolyzate of calcium silicate. The pH value could impact the equilibrium of calcium silicate hydrolyzation as well as the ionization of H2 SiO3 with organic compound and ammonia, so that it could further affecting the COD and NH3-N removal. The static removal rate of COD and NH3-N was 16.1% and 27.1%, respectively, under the condition of pH=7.00, calcium silicate dosage 170 g/L, and oscillation time 75 min. Using calcium silicate bed with 10 mm in diameter, and 300 mm in depth for pre-treatment, the dynamic removal rate of COD and NH3-N reached to 59.8% and 35.9%, respectively.

关 键 词：硅酸钙 焦化废水 预处理 吸附 COD NH3-N 

分 类 号：X784[环境科学与工程—环境工程]