Dewatered sludge of water treatment plant (WTP) was used as adsorbent for adsorption of phosphorus removal.Phosphorus adsorption isotherm and the impact of coexisting ions,pH,dosage of adsorbent and temperature on phosphorus removal efficiency were studied.Phosphorus removal capability of dewatered sludge of WTP turned out to be significant and its saturation adsorption capacity was 16.56 mg/g.The process of phosphorus adsorption was found to fit Langmuir isotherm well.Inhibitory effect on adsorption was found with coexisting of CO23-due to the competitive adsorption between CO2-3 and PO4-3,while the impact of coexisting cation was weak.Results showed that the phosphorus adsorption capacity and removal rate decreased under alkaline condition,and increased with the raising of temperature.%介绍了利用自来水厂脱水污泥作为吸附除磷的吸附剂,研究其等温吸附特性,考察共存阴阳离子、pH值、吸附剂投加量及温度对除磷效果的影响.试验结果表明:自来水厂脱水污泥具有显著的吸附除磷效果,其对磷的吸附过程符合Langmuir等温吸附模型,理论饱和吸附容量达16.56 mg/g;共存CO2-3对吸附过程产生明显抑制,与PO4-3存在竞争吸附;共存阳离子对吸附过程影响不大;吸附容量和去除率均随pH值升高而降低;温度升高使吸附容量与除磷效果均有提升.
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