利用陶粒/颗粒活性炭组成新型复合滤料,同时结合臭氧氧化作用深度处理饮用水,考察了臭氧/复合滤料生物滤池深度处理饮用水的效果及有关参数对处理效果的影响。试验结果表明,该生物滤池对浊度、UV254、CODMn、NO2-N的平均去除率分别为69...利用陶粒/颗粒活性炭组成新型复合滤料,同时结合臭氧氧化作用深度处理饮用水,考察了臭氧/复合滤料生物滤池深度处理饮用水的效果及有关参数对处理效果的影响。试验结果表明,该生物滤池对浊度、UV254、CODMn、NO2-N的平均去除率分别为69.1%、43.2%、65.4%和75.8%,对NH4+-N的平均去除率可高达91.2%。随着空床接触时间的延长,对各污染物的去除率逐渐增大,综合对各指标的去除情况及经济因素,空床接触时间以15 m in左右为宜。对污染物的去除主要集中在滤池上部,去除效果的变化趋势与溶解氧浓度沿滤料层的变化趋势基本一致。该生物滤池对污染物的去除效果与进水污染物浓度有关,经拟合,对CODMn和NH4+-N的去除率与进水CODMn浓度呈对数关系,当CODMn为0~20 mg/L时,随着进水CODMn浓度的增大,对CODMn的去除率逐渐增大,而对NH4+-N的去除率逐渐降低。展开更多
To assess the feasibility of biogenic schwertmannite to act as a sorbent for removing arsenite from groundwater, a series of biogenic schwertmannite-packed column adsorption experiments were conducted on simulated As(...To assess the feasibility of biogenic schwertmannite to act as a sorbent for removing arsenite from groundwater, a series of biogenic schwertmannite-packed column adsorption experiments were conducted on simulated As(III)-containing groundwater. Empty bed contact time (EBCT), As(III) concentration in effluent, and the removal efficiency of As(III) through the column were investigated at pH 8.0 and temperature 25 ± 0.5℃. The results showed that the breakthrough curves were mainly dependent on EBCT values when the influent As(III) concentration was 500 μg L^(-1) and the optimum EBCT was 4.0 min. When the effluent As(III) concentration reached 10 and 50 μg L^(-1) , the breakthrough volumes for the schwertmannite adsorption column were 4 200 and 5 600 bed volume (BV), with As(III) adsorption capacity of 2.1 and 2.8 mg g^(-1) , respectively. Biogenic schwertmannite could be regenerated by 1.0 mol L^(-1) NaOH solution, and more than 80% of As(III) adsorbed on the surface of schwertmannite could be released after 3 successive regenerations. The breakthrough volume for the regenerated schwertmannite-packed column still maintained 4 000-4 200 BV when the As(III) concentration in effluent was below 10 μg L^(-1) . Compared with other sorbents for As(III) removal, the biogenic schwertmannitepacked column had a higher breakthrough volume and a much higher adsorption capacity, implying that biogenic schwertmannite was a highly efficient and potential sorbent to purify As(III)-contaminated groundwater.展开更多
文摘利用陶粒/颗粒活性炭组成新型复合滤料,同时结合臭氧氧化作用深度处理饮用水,考察了臭氧/复合滤料生物滤池深度处理饮用水的效果及有关参数对处理效果的影响。试验结果表明,该生物滤池对浊度、UV254、CODMn、NO2-N的平均去除率分别为69.1%、43.2%、65.4%和75.8%,对NH4+-N的平均去除率可高达91.2%。随着空床接触时间的延长,对各污染物的去除率逐渐增大,综合对各指标的去除情况及经济因素,空床接触时间以15 m in左右为宜。对污染物的去除主要集中在滤池上部,去除效果的变化趋势与溶解氧浓度沿滤料层的变化趋势基本一致。该生物滤池对污染物的去除效果与进水污染物浓度有关,经拟合,对CODMn和NH4+-N的去除率与进水CODMn浓度呈对数关系,当CODMn为0~20 mg/L时,随着进水CODMn浓度的增大,对CODMn的去除率逐渐增大,而对NH4+-N的去除率逐渐降低。
基金Supported by the National Natural Science Foundation of China.(Nos.40930738 and 21077053)
文摘To assess the feasibility of biogenic schwertmannite to act as a sorbent for removing arsenite from groundwater, a series of biogenic schwertmannite-packed column adsorption experiments were conducted on simulated As(III)-containing groundwater. Empty bed contact time (EBCT), As(III) concentration in effluent, and the removal efficiency of As(III) through the column were investigated at pH 8.0 and temperature 25 ± 0.5℃. The results showed that the breakthrough curves were mainly dependent on EBCT values when the influent As(III) concentration was 500 μg L^(-1) and the optimum EBCT was 4.0 min. When the effluent As(III) concentration reached 10 and 50 μg L^(-1) , the breakthrough volumes for the schwertmannite adsorption column were 4 200 and 5 600 bed volume (BV), with As(III) adsorption capacity of 2.1 and 2.8 mg g^(-1) , respectively. Biogenic schwertmannite could be regenerated by 1.0 mol L^(-1) NaOH solution, and more than 80% of As(III) adsorbed on the surface of schwertmannite could be released after 3 successive regenerations. The breakthrough volume for the regenerated schwertmannite-packed column still maintained 4 000-4 200 BV when the As(III) concentration in effluent was below 10 μg L^(-1) . Compared with other sorbents for As(III) removal, the biogenic schwertmannitepacked column had a higher breakthrough volume and a much higher adsorption capacity, implying that biogenic schwertmannite was a highly efficient and potential sorbent to purify As(III)-contaminated groundwater.
