不同基质人工湿地去除猪场沼液中氨氮性能  

Artificial wetlands filled with different packing materials to remove ammonia nitrogen from biogas slurry of pig farm

作　　者：刘国[1,2] 刘国[1] 胡凤妹[1] 汤景鹏[1] 何佼 

机构地区：[1]成都理工大学环境与土木工程学院、地质灾害防治与地质环境保护国家重点实验室,四川成都610031 [2]南京大学环境学院,江苏南京210008

出　　处：《环境污染与防治》2014年第1期13-18,共6页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.41272266);四川省教育厅科研基金资助项目(No.ZT0044)

摘　　要：以猪场沼液为研究对象,通过等温吸附实验研究沸石、铁粉、硅藻土、煤渣、石英砂5种基质对氨氮的等温吸附特征,并采用一级和准二级动力学方程分析吸附动力学过程。根据实验结果选取沸石和石英砂基质构建4种不同类型的人工湿地单元对比研究猪场沼液中氨氮的处理效果。结果表明,5种基质对氨氮的吸附适合用Langmuir等温吸附方程描述,沸石对氨氮的吸附能力最强,其最大吸附量达1.049 8mg/g。从相关系数(R2)分析,准二级动力学方程能更好描述各种基质对氨氮的吸附动力学过程。沸石的平衡吸附量最大,为1.719 0mg/g。沸石-垂直潜流人工湿地单元在构建的4种人工湿地单元中对猪场沼液氨氮处理效果最好,且对高浓度沼液的抗冲击能力最强。Artificial wetlands filled with different packing materials were constructed for treatment of biogas slurry of pig farm. Isothermal adsorption characteristic of NH4＋-N on 5 packing matrix （zeolite,iron powder , diatom- ite,cinder and quartz sand） was researched through static adsorption experiments. The dynamic adsorption process was fitted by first-level and second-level dynamics models respectively. Results showed that the isothermal adsorption characteristic of NH4＋-N could be well fitted by Langmuir equation;among the 5 packing matrix,zeolite had the maxi- mum NH4＋-N adsorption capacity with the maximum saturated absorption quantity of NH4＋-N was 1. 049 8 mg/g. From the analysis of correlation coefficient R2 ,second-level kinetics equation was better than first-level kinetics equa- tion when describing the dynamic NH4＋-N adsorption process,and zeolite achieved the highest equilibrated adsorption capacity of 1. 719 0 mg/g. Base on the experiment results,zeolite and quartz sand were selected as packing materials to construct 4 different wetlands, and zeolite-vertical flow artificial wetlands presented the best NH4＋ -N removal efficien- cy from biogas slurry of pig farm as well as the strongest resistance to high concentrate NH＋-N impact.

关 键 词：人工湿地 基质 猪场沼液 氨氮 

分 类 号：X713[环境科学与工程—环境工程]