模拟串联垂直流人工湿地去除重污染河水中氮的研究

李珂; 贾建丽; 卢少勇; 万正芬

文章摘要

李珂,贾建丽,卢少勇,万正芬.模拟串联垂直流人工湿地去除重污染河水中氮的研究[J].农业环境科学学报,2014,33(12):2420-2426.

模拟串联垂直流人工湿地去除重污染河水中氮的研究

Nitrogen Removal from Heavily Polluted River Water by a Series of Simulated Vertical-Flow Constructed Wetlands

投稿时间：2014-06-26

DOI：10.11654/jaes.2014.12.020

中文关键词: 串流垂直流人工湿地河水氮水力负荷植物

英文关键词: series vertical-flow constructed wetlands river water nitrogen hydraulic load hydrophyte

基金项目:国家水体污染控制与治理科技重大专项(2012ZX07105-002,2013ZX07101-014);中央级公益性科研院所基本科研业务专项(2012-YSKY-14)

作者	单位	E-mail
李珂	中国矿业大学(北京)化学与环境工程学院, 北京 100083 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
贾建丽	中国矿业大学(北京)化学与环境工程学院, 北京 100083
卢少勇	中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012	lushy2000@163.com
万正芬	中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 中国海洋大学环境科学与工程学院, 青岛 266100

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中文摘要:

利用在温室内构建的串联垂直流人工湿地模拟装置净化北京市清河污染河水,研究2种水力负荷、3个串联级数、有无植物等对湿地除氮效果的影响.5个多月的运行结果表明:在进水总氮(TN)浓度平均12.36 mg·L^-1,氨氮浓度平均5.92 mg·L^-1时,TN去除率在水力负荷为0.2 m³·m^-2·d^-1时明显高于0.4 m³·m^-2·d^-1时;串联级数对氮去除有一定影响,1级柱与3级柱系统间存在显著差异(P<0.05),多级柱系统间无差异(P>0.05);植物显著影响除氮,有-无植物系统间存在显著差异(P<0.05).总体上,水力负荷为0.2 m³·m^-2·d^-1时,有植物3级柱系统的TN、氨氮的去除率最高,其中氨氮去除率高达85.74%,出水平均浓度0.43 mg·L^-1,达地表水Ⅱ类水质标准.

英文摘要:

Constructed wetland is a cost-effective technique to treat contaminated water. Here a series of simulated vertical-flow constructed wetlands(four groups of three stage columns, each column measuring 90 cm in height, 9.5 cm in diameter, and packed with gravels of particle size from 4.4 to 26.4 mm in a height of 80 cm) planted with Phragmites communis were developed to treat water from Qinghe River of Beijing under greenhouse conditions. Effects of two hydraulic loads, three stages of series connection and vegetation on nitrogen removal rates were observed for 144 days. The influent water contained total nitrogen(TN) 3.42~17.99 mg·L^-1, with an average of 12.36±4.65 mg·L^-1, and ammonia nitrogen 0.91~9.89 mg·L^-1, with an average of 5.92±3.34 mg·L^-1. The TN removal rates were significantly higher under hydraulic load of 0.2 m³·m^-2·d^-1 than under 0.4 m³·m^-2·d^-1. The TN removal rates also had significant difference between one stage and three stage column systems(P<0.05), but had no difference in multistage column systems(P>0.05). The presence of hydrophytes significantly promoted nitrogen removal(P<0.05). Overall, the three stage column system with hydrophytes under hydraulic load of 0.2 m³·m^-2·d^-1 had the highest removal rate of TN and ammonia nitrogen, in which the ammonia nitrogen removal rate was 85.74%, and the average ammonia nitrogen in the effluent was 0.43 mg·L^-1, below the grade-Ⅱstandard of surface water. Considering the removal efficiency and actual costs, two stage column systems with hydrophytes would be recommended.

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