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引用本文:熊鑫,柯凡,李勇,李文朝,潘继征,张洪,高亚.过氧化钙对水中低浓度磷的去除性能.湖泊科学,2015,27(3):493-501. DOI:10.18307/2015.0317
XIONG Xin,KE Fan,LI Yong,LI Wenchao,PAN Jizheng,ZHANG Hong,GAO Ya.Low concentration of phosphorus removal in waters with CaO2. J. Lake Sci.2015,27(3):493-501. DOI:10.18307/2015.0317
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过氧化钙对水中低浓度磷的去除性能
熊鑫1, 柯凡2, 李勇1, 李文朝2, 潘继征2, 张洪1, 高亚1
1.苏州科技学院, 苏州 215009;2.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
针对水体中低浓度磷深度净化问题,以过氧化钙为吸附剂,采用等温吸附、吸附热力学模型和吸附动力学模型的方法开展其对磷酸盐吸附特性的研究,讨论pH、共存阴离子对其除磷过程的干扰能力.结果表明:(1) 过氧化钙对磷酸盐的吸附等温线方程符合Langmuir方程,过氧化钙对磷酸盐的最大吸附量为381.7 mg/g(25℃);(2) 过氧化钙在除磷过程中系统的热力学参数ΔG0<0,ΔH0<0,即过氧化钙对磷的吸附作用是一个自发的放热过程;(3) 二级反应速率方程可精准地描述过氧化钙的吸附行为,其吸附速率随着溶液中磷酸盐浓度的升高而升高,经过4 min即可达到吸附平衡;(4) 过氧化钙在pH=8时除磷效果达到最佳;(5) 高浓度倍数的共存阴离子中,CO32-对过氧化钙除磷影响最大,在10倍浓度下可造成吸附量减少14.7%.
关键词:  过氧化钙  磷酸盐  除磷  低浓度
DOI:10.18307/2015.0317
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2012ZX07103)资助.
Low concentration of phosphorus removal in waters with CaO2
XIONG Xin1, KE Fan2, LI Yong1, LI Wenchao2, PAN Jizheng2, ZHANG Hong1, GAO Ya1
1.Suzhou University of Science and Technology, Suzhou 215009, P.R.China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
Aiming at the advanced purification of low concentration of phosphorus in natural water, the adsorption of phosphate by CaO2 was studied using the models of adsorption kinetics and adsorption isotherm, and the influence of different operating parameters on the phosphorus removal was investigated.The results showed that:(1) The experimental data for the process of phosphate uptake onto CaO2 fit the Langmuir isotherm mode, and the maximum adsorption capacity was 381.7 mg/g (25℃).(2) Thermodynamic parameters in the process of phosphorus removal are ΔG0<0 and ΔH0<0, while the process was a spontaneous exothermic one.(3) The adsorption performance of CaO2 was evaluated by the pseudo-second-order reaction rate equation, when the adsorption rate increased with the increasing concentration of phosphate in the solution, and the adsorptive reaction reached equilibrium in 4 minutes.(4) The optimized effect of phosphorus removal was obtained at pH=8.(5) Among the high concentrations of coexisting anions, the CO32- expressed the greatest influence on phosphorus removal of CaO2 and could make the adsorption capacity reduce 14.7% under the concentration of 10 times.
Key words:  CaO2  phosphate  phosphorus removal  low concentration
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