生物除铁除锰滤池反冲洗铁锰泥除As(Ⅴ)研究  

As(Ⅴ) Removal with Iron and Manganese Oxide Sludge from Biological Iron and Manganese Removal Filter

作　　者：赵运新 曾辉平[1] 吕育锋[1] 李冬[1] 张杰[1,2] 

机构地区：[1]北京工业大学水质科学与水环境恢复工程北京市重点实验室,北京100124 [2]哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090

出　　处：《中国给水排水》2017年第11期1-6,共6页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51308009)

摘　　要：生物除铁除锰滤池反冲洗废水中含有大量富含铁锰氧化物的污泥,直接排放会产生环境压力。采用预处理得到的反冲洗泥粉末吸附去除饮用水中的As(Ⅴ),结果表明,准二级动力学能更好地描述其对As(Ⅴ)的吸附过程(R^2>0.99),Langmuir等温方程更符合其吸附行为(R^2>0.99),最大吸附容量为40.98 mg/g;在酸性或中性条件下对As(Ⅴ)的吸附率大于92%,吸附去除率随着p H值升高而逐渐降低;H_2PO_4^-与SiO_3^(2-)能显著抑制As(Ⅴ)的吸附,而HCO_4^-、SO_4^(2-)、Mg^(2+)和Ca^(2+)对吸附过程影响不大;对As(Ⅴ)的吸附焓变ΔH_0均为正值即属于吸热反应,吉布斯自由能变化ΔG_0均为负值,表明吸附为自发进行。Abstract： Backwashing wastewater from biological iron and manganese removal filter contains a lot of iron and manganese oxide-rich sludge, and direct emissions will produce negative impact on the envition conformed to the second-order kinetic model and the Langmuir isothermal adsorption model, with R2 more than 0.99, and the maximum adsorption capacity was 40.98 mg/g. The adsorption rate was more than 92% in acidic or neutral condition and it decreased with the increase of pH. HaPO4^- and SiO3^2- had great effect on arsenic removal, while it was minor for HCO3^- , SO4^2- , Mg^2 ＋ and Ca^2 ＋. The adsorption enthalpy change △H0 was positive, which indicated the adsorption process was endothermic, meanwhile the minus Gibbs free energy change AGO suggested the adsorption process was spontaneous.

关 键 词：生物除铁除锰 铁锰氧化物 反冲洗泥 除砷 吸附 

分 类 号：X703[环境科学与工程—环境工程]