颗粒蛤蜊壳对污水中磷的吸附性能
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摘要
选用生活中常见的厨余废弃物蛤蜊壳对污水中的磷进行吸附。分别采用linear、Langmuir、Freundlich等温吸附模型对反应吸附数据进行拟合,采用准一级动力学模型、准二级动力学模型和Elovich模型描述颗粒蛤蜊壳对水中磷的吸附动力学过程,并对反应进行热力学研究。此外,研究温度、粒径、投加量和pH等因素对蛤蜊壳吸附磷的影响。试验结果表明:Langmuir方程更适合描述颗粒蛤蜊壳的吸附行为,相关性达到显著水平;准二级动力学方程更适用于描述颗粒蛤蜊壳对水中磷的吸附动力学过程。Gibbs自由能(ΔG)<0,焓变(ΔH)>0,说明颗粒蛤蜊壳对磷的吸附是自发的吸热反应。蛤蜊壳粒径越小对磷的吸附量越大;蛤蜊壳投加量越大,磷去除率越高而吸附量越低;酸性条件利于蛤蜊壳对磷的吸附。
Clamshells, a kind of kitchen waste, were used to adsorb phosphorus in wastewater. Linear, Langmuir and Freundlich adsorption isotherm models were used to fit the adsorption data respectively. Pseudo first order kinetic model, quasi second order kinetic model and Elovich model were used to describe the kinetics of phosphorus adsorption by granular clamshells, and thermodynamics of the adsorption reaction was also studied. Moreover, impacts on phosphorus adsorption, such as temperature, granular size, dosage and pH of solution were studied. The results showed Langmuir equation was more suitable to describe the adsorption behavior of granular clamshells, of which the correlation was significant; Quasi second order kinetics equation was more suitable to describe phosphorus adsorption kinetics. Gibbs free energy(ΔG) was less than zero, and enthalpy change(ΔH) was greater than zero, indicating that the adsorption of phosphorus by granular clamshells was a spontaneous endothermic reaction. The smaller granular size was, the better adsorption capacity of phosphorus had; The higher dosage of granular clamshells added, the higher removal rate but lower adsorption capacity of phosphorus had; Acidic conditions was conducive to phosphorus adsorption.
Clamshells, a kind of kitchen waste, were used to adsorb phosphorus in wastewater. Linear, Langmuir and Freundlich adsorption isotherm models were used to fit the adsorption data respectively. Pseudo first order kinetic model, quasi second order kinetic model and Elovich model were used to describe the kinetics of phosphorus adsorption by granular clamshells, and thermodynamics of the adsorption reaction was also studied. Moreover, impacts on phosphorus adsorption, such as temperature, granular size, dosage and pH of solution were studied. The results showed Langmuir equation was more suitable to describe the adsorption behavior of granular clamshells, of which the correlation was significant; Quasi second order kinetics equation was more suitable to describe phosphorus adsorption kinetics. Gibbs free energy(ΔG) was less than zero, and enthalpy change(ΔH) was greater than zero, indicating that the adsorption of phosphorus by granular clamshells was a spontaneous endothermic reaction. The smaller granular size was, the better adsorption capacity of phosphorus had; The higher dosage of granular clamshells added, the higher removal rate but lower adsorption capacity of phosphorus had; Acidic conditions was conducive to phosphorus adsorption.
引文
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[3]杨合,王振.反应条件对钢渣除磷的影响[J].东南大学学报(自然科学版),2015,36(11):1605-1608.
[4]叶爱英,徐景峰.粉煤灰的改性、成型及深度除磷应用[J].化工环保,2013,33(1):84-86.
[5]XU X, GAO B, YUE Q, et al. Preparation, characterization of wheat residue based anion exchangers and its utilization for the phosphate removal from aqueous solution[J]. Carbohydrate Polymers,2010,82(4):1212-1218.
[6]ANIRUDHAN T S, AND B, MANOHAR D M. Phosphate removal from wastewaters using a weak anion exchanger prepared from a lignocellulosic residue[J]. Environmental Science & Technology, 2006,40(8):2740-2745.
[7]李倩,燕晓莹.超声处理鸡蛋壳对废水中磷吸附的影响[J].贵州农业科学,2015,43(3):177-179.
[8]JEON D J, YEOM S H. Recycling wasted biomaterial, crab shells, as an adsorbent for the removal of high concentration of phosphate[J]. Bioresource Technology, 2009,100(9):2646-2649.
[9]张倩.水平潜流人工湿地去除受污染水体中磷的研究[D].上海:同济大学,2007.
[10]LANGMUIR I. The adsorption of gases on plane surfaces of glass, mica and platinum[J]. Journal of Chemical Physics, 2015, 40(12):1361-1403.
[11]LENT B V, SCHEUTJENS J, COSGROVE T. Self-consistent field theory for the adsorption of ring polymers from solution[J]. Special Purpose Rubber Products, 1987, 20:366-370.
[12]金晓丹,王敦球,张华,等.鸡蛋壳对磷的吸附特性研究[J].水处理技术,2010,36(4):56-59.
[13]胡颖,操家顺.天然鸡蛋壳对污水中三家铬的吸附特性[J].工业安全与环保, 2016,42(10):14-18.
[14]赵桂瑜.人工湿地除磷基质筛选及其吸附机理研究[D].上海:同济大学,2007.
[15]马锋锋,赵保卫,钟金魁,等.牛粪生物炭对磷的吸附特性及其影响因素研究[J].中国环境科学,2015,35(4):1156-1163.
[16]周琦,黄勇,李祥,等.分散式生活污水处理工艺适宜性探讨[J].水处理技术,2014, 40(5):22-26.
[17]张元超,金惠英,李小豪,等.贝壳填料用于生活污水对磷和化学需氧量的处理研究[J].辽宁化工,2015,44(8):977-979.
[18]李林锋,吴小凤.天然牡蛎壳对磷吸附特性试验研究[J].三峡环境与生态,2011,33(6):1-8.
[19]许育新,张棋,肖华,等.珍珠蚌壳除磷的静态吸附研究[C].中国环境科学学会学术年会论文集,2010.