摘要
为研究活性污泥对汞的吸附特性,本研究以焦作市第一污水处理厂活性污泥为原料,制取干污泥作为吸附剂,开展了干污泥对水中低浓度(ng·L^(-1))无机汞和甲基汞的吸附动力学实验和等温吸附实验.吸附动力学实验结果表明,干污泥对无机汞的吸附表现为吸附量在前30 min急剧增加,30 min后缓慢增加直至平衡.干污泥对甲基汞的吸附速率远远快于无机汞,在1 min内基本达到吸附平衡状态.干污泥对无机汞和甲基汞的吸附过程均符合Pseudo-second Order模型,属于化学吸附过程.等温吸附实验结果表明,干污泥对无机汞和甲基汞的吸附量与平衡浓度呈近似线性关系,等温线与Henry方程拟合较好.干污泥对水中无机汞和甲基汞的去除率随着初始汞浓度的增加呈现上升趋势,达到一定浓度后趋于稳定.
Adsorption kinetics and adsorption isotherm experiments were conducted in order to understand the adsorption characteristics of inorganic mercury and methylmercury onto sewage sludge. The dry sludge used as adsorbent was made from activated sludge produced by Jiaozuo Sewage Treatment Plant. It was showed that the adsorption quantities of inorganic mercury on dry sludge increased sharply within 30 minutes,and then slowed down until reaching the adsorption equilibrium. The adsorption of methylmercury on dry sludge was much faster than that of inorganic mercury,reaching the equilibrium within 1 minute. The adsorption of inorganic mercury and methylmercury on sewage sludge followed the Pseudo-second Order model,suggesting a chemical adsorption mechanism. The adsorption quantities of inorganic mercury and methylmercury on dry sludge positively correlated with equilibrium concentrations,and the adsorption isotherms fitted well with the Henry model. The removal efficiency of inorganic mercury and methylmercury from aqueous solution by dry sludge via adsorption increased along with the increase of initial mercuryconcentrations until reaching a constant.
出处
《环境化学》
CAS
CSCD
北大核心
2016年第6期1261-1268,共8页
Environmental Chemistry
基金
国家自然科学基金(21177035
21377035)
河南省高校科技创新人才支持计划(15HASTIT045)资助~~
关键词
污泥
吸附动力学
吸附等温线
无机汞
甲基汞
sludge
adsorption kinetics
adsorption isotherm
inorganic mercury
methylmercury
