农业环境科学学报Issue(9)：1837-1842,6.DOI:10.11654/jaes.2014.09.023
改性沸石对猪场沼液氮磷吸附特性与机理分析
Mechanisms of Nitrogen and Phosphorus Adsorption from Biogas Slurry of Piggery by Modified Zeolite
摘要
Abstract
Biogas slurry is rich in nutrients, such as nitrogen, phosphorus and organic compounds. Removals of these nutrients will reduce biogas slurry risks to the environment. In this study, adsorption characteristics of nitrogen and phosphorus from biogas slurry were investigat-ed using modified zeolite under different zeolite doses, adsorption times, and initial concentrations of biogas slurry. The removal mechanisms of nitrogen and phosphorus by the modified zeolite were also explored. At 10 g per100mL of zeolite and 48 h of adsorption time, the removal rates of NH+4 and TP were up to 90.66%and 85.97%, with maximal adsorption capacity of 1.43 mg·g-1 and 0.16 mg·g-1, respectively. The zeolite after adsorption contained high nitrogen and phosphorus, and was a high quality slow-release fertilizer. Nitrogen and phosphorus ad-sorption could be better fitted by Freundlich and Langmuir isotherm models, with R2 over 0.98. Their adsorption kinetics followed the pseudo second-order kinetic model. Organic nitrogen and phosphorus removals by the zeolite were mainly via physical adsorption and coordination reaction, while inorganic ones through ion exchange and precipitation.关键词
改性沸石/猪场沼液/吸附等温线模型/准二级动力学模型Key words
modified zeolite/biogas slurry of piggery/adsorption isotherm models/pseudo second-order kinetic model分类
资源环境引用本文复制引用
张文艺,郑泽鑫,韩有法,占明飞..改性沸石对猪场沼液氮磷吸附特性与机理分析[J].农业环境科学学报,2014,(9):1837-1842,6.基金项目
江苏省自然科学基金（BE2012640，BY2012100）；“十二五”国家水体污染控制与治理科技重大专项 （）
