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氧化-载钠改性黑臭河道底泥对磷削减的效果及机制
Effect evaluation and mechanism of phosphorus removal using oxidation-Na+ doped sediment from malodorous river
投稿时间:2017-05-05  修订日期:2017-07-19
DOI:10.12030/j.cjee.201705034
中文关键词:  黑臭河道  底泥  改性  磷去除  吸附
英文关键词:malodorous river  sediment  modified  phosphorus removal  sorption
基金项目:北京市自然科学基金资助项目(8174080);中国博士后科学基金资助项目(2017M610968)
作者单位
陈星 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 
陆莹 复旦大学环境科学与工程系, 上海 200433 
黄威 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 
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中文摘要:
      黑臭河道是我国各大城市面临的主要环境问题之一,其底泥的处置和水体中过量磷的削减急需合理的方法。研究黑臭河道底泥的资源化利用方式,以削减水体中过量的磷具有非常重要的意义。选取北京市凉水河底泥(PS),对其进行氧化(PS-N)、载钠(PS-Na)以及氧化-载钠(PS-NNa)改性手段,评估原始底泥以及3种改性底泥作为磷吸附材料对磷的削减效果。结果表明,3种改性材料对磷的削减效果均达到60%以上,其中氧化-载钠改性底泥效果最高可达94.7%。利用动力学和吸附等温公式分析材料对磷吸附的机制,结果表明,PS-Na、PS-N和PS-NNa的最大吸附量分别为0.83、1.03和1.42 mg·g-1,且较高的环境温度有利于材料对磷的吸附。此外,动力学分析结果表明,准二级动力学模型能更好地描述改性材料的吸附动力学行为,对磷的吸附主要是材料表面活性吸附点位起主导作用。与国内外常用磷吸附材料相比,3种改性底泥材料在高效除磷方面具有一定的优势。
英文摘要:
      Malodorous river is one of the main environmental problems in the cities of China. The suitable method of the disposal of the sediment and excess phosphorus (P) in malodorous river need to be found. Therefore, it is significant to study the method of the resource of the sediment in malodorous river to remove the excess P in water. The sediment in Liangshui River (PS) in Beijing was chosen and modified using oxidation (PS-N), Na+ doped (PS-Na), and oxidation-Na+ doped (PS-NNa). The P removal efficiency using the four sediment materials was evaluated, and the results indicated that the P removal efficiency using modified sediment materials could reached more than 60%, and PS-NNa had the highest P removal efficiency (94.7%). The sorption isotherms and kinetic were used to study the sorption mechanism of the four sediment materials. The results indicated that the maximum sorption capacities of PS-Na, PS-N, and PS-NNa were 0.83, 1.03 and 1.42 mg·g-1, respectively, and the high temperature was favor of sorption. The kinetic study indicated that the pseudo-second-order model could better describe the sorption kinetics, and the exterior activated site had the main function of P sorption. In addition, the three modified sediment materials had the obvious advantage of P removal compared with other P sorption materials.
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