铁氧化物改性煤渣去除废水中磷的研究  

Removal of Phosphate from Wastewater Using Iron Oxide-Modified Coal Cinder

作　　者：梁帮强[1] 何勇[2] 张文娟[1] 黄玉明[1] 

机构地区：[1]西南大学化学化工学院,重庆400715 [2]三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《西南大学学报（自然科学版）》2011年第7期114-117,共4页Journal of Southwest University(Natural Science Edition)

基　　金：863计划资助项目(2008AA06Z312);重庆市科技攻关资助项目(CSTC;2009AB7028)

摘　　要：以煤渣为载体制备了负载型铁氧化物的填料作为人工湿地系统新型除磷基质,研究了其对废水中磷素的吸附特性.结果表明,与未改性煤渣相比,改性基质对废水中磷素的去除率提高了约11倍.动力学研究表明,准二级动力学方程可以很好模拟改性基质对磷素的吸附动力学过程;热力学研究表明,用Langmuir方程能较好地描述吸附等温线,理论饱和吸附量为84.75 mg/kg.当改性基质的投加量为80 g/L时,对磷素的去除率达到90%;同时研究了基质投加量、溶液pH值、腐殖酸和温度对吸附的影响.The potential of using coal cinder-supported iron oxides as the substrate for the removing of phosphate in constructed wetlands was investigated in the present study.The results demonstrated that compared with the unmodified coal cinder,the as-prepared new substrate increased phosphate removal by 11 times.The kinetic phosphate adsorption data of iron oxide-coated coal cinder fitted well with the pseudo-second-order kinetic model and the isothermal adsorption data could be modeled well with the Langmuir formula with the estimated maximum phosphate adsorption capacity of 84.74 mg/kg.The removal efficiency of phosphate was as high as 90% at an adsorbent dosage of 80 g/L.The optimum pH value for phosphate removal was found to be 6.0~7.0.The factors affecting phosphate removal such as adsorbent dosage,pH of solution,concentration of humic acid and solution temperature were also studied.

关 键 词：改性煤渣 人工湿地 磷酸根 吸附 

分 类 号：X703[环境科学与工程—环境工程]