剩余污泥与人造沸石复合体系去除废水中的钙离子-中国有色金属学报.PDF

第 17 卷第 5 期 中国有色金属学报 2007 年 5 月 Vol.17 No.5 The Chinese Journal of Nonferrous Metals May 2007 文章编号：1004-0609(2007)05-0825-05 剩余污泥与人造沸石复合体系去除废水中的钙离子 袁 林，柴立元，闵小波，王云燕，舒余德，周 敏，方 艳，王 璞，常 皓 ( 中南大学 冶金科学与工程学院，长沙 410083) 摘 要：采用剩余污泥与人造沸石复合体系去除废水中的 Ca2+ ，考察了各因素对 Ca2+去除的影响。结果表明：沸 石与废水的固液比是影响 Ca2+去除的最关键因素，温度和 pH 值的影响较大，而反应时间在最初 10 min 内影响显 著，之后则影响较小；在 25 ℃，初始pH 值 8.04 条件下，反应 1 h，Ca2+ 的去除率随着固液比的增加而增大，初 始 Ca2+ 的质量浓度为 801.60 mg/L 时，保持沸石与废水固液比为 3׃100，Ca2+ 的去除率达到 80.38%，剩余 Ca2+仅 为 157.31 mg/L；升高温度对Ca2+去除有促进作用，Ca2+ 的去除率从20 ℃时的 77.30%增大到 45 ℃时的 90.71% ； Ca2+去除在最初的 50 min 内吸附达到平衡。人造沸石的红外光谱图表明脱钙过程主要是化学吸附。 关键词：剩余污泥；人造沸石；钙离子；废水净化 中图分类号：X 703 文献标识码：A Removal of calcium ion from wastewater using waste activated sludge and artificial zeolites YUAN Lin, CHAI Li-yuan, MIN Xiao-bo, WANG Yun-yan, SHU Yu-de, ZHOU Min, FANG Yan, WANG Pu, CHANG Hao (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: Removal of calcium from wastewater was carried out using waste activated sludge and artificial zeolites. The effects of parameters such as pH, temperature, reaction time and sorption duration on removal rate of Ca2+ were studied. The results show that solid-to-liquid ratio is the most important factor on the removal of Ca2+, pH and temperature have obvious influences on the process, and reaction time has little effect on removal rate of Ca2+ after reacting for 10 min. The removal rate of Ca2+ increases with increasing solid-to-liquid ratio under conditions of 25 ℃, initial pH 8.04, reacting for