碳源调控下复合垂直流人工湿地脱氮研究 Nitrogen Removal Under the Condition of Carbon Source Supple

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碳源调控下复合垂直流人工湿地脱氮研究

Nitrogen Removal Under the Condition of Carbon Source Supplement in Integrated Vertical-flow Constructed Wetland

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摘要:碳源是制约生物脱氮效率的重要因素.我国城市污水碳源不足,需要考虑补充碳源提供反硝化电子供体.在复合垂直流人工湿地(IVCW)系统中,通过湿地特有的通气管补充碳源到湿地底部,改善了湿地内部微生物环境,强化了湿地脱氮功能,对氮的去除效率有显著提高.结果表明,葡萄糖作为外加碳源提高系统的反硝化能力要优于羧甲基纤维素(CMC),投加葡萄糖的系统比未补充碳源的系统脱氮效率有显著提高(p<0.05).通过投加不同量的葡萄糖进行对比实验,发现对于处理量60 L·d~(-1)的IVCW系统最佳葡萄糖投加量为1.5 g.此时C_6H_(12)O_6:NO_3~--N的质量比仅为4.3,这个投加量远低于在进水中为满足反硝化所需调控的C/N,因此通气管投加碳源的方式可节约外加碳源成本.此外,在进水前4h投加碳源要优于进水时加入碳源.
Abstract:Carbon source is the main factor influencing biological denitrification efficiency. In most cities of China, carbon content in sewage was observed to be low, herein carbon source supplement should be considered to provide electron donors needed in biological denitrification process. The influence of adding different carbon sources through aeration pipe of integrated vertical-flow constructed wetland (IVCW) on nitrogen removal had been studied. Carbon source supplement to the bottom of IVCW could improve microbe conditions and intensify nitrogen removal function of IVCW. The results showed that glucose as external carbon source was better than carboxymethyl cellulose ( CMC) on denitrification. Nitrogen removal had significant difference between adding glucose and no carbon source in IVCW system(p <0.05). By the experiments of adding different quantity of glucose, the dose of 1.5 g glucose under 60 L·d~(-1) hydraulic load was the optimization for denitrification. C_6H_(12)O_6 :NO_3~- -N was 4.3 and far lower than that by adding in inflow. So carbon source supplement to the bottom of IVCW through aeration pipe could save carbon source supplement cost. Additionally, adding glucose for four hours before influent feeding could improve nitrogen removal.
作 者: 佘丽华    贺锋    徐栋    林济东    吴振斌    SHE li-hua    HE Feng    XU Dong    LIN Ji-dong    WU Zhen-bin  
作者单位:佘丽华,SHE li-hua(中国科学院水生生物研究所淡水生态和生物技术国家重点实验室,武汉,430072;中国科学院研究生院,北京,100049)水利论文#aw#N aKz4M%I
贺锋,徐栋,吴振斌,HE Feng,XU Dong,WU Zhen-bin(中国科学院水生生物研究所淡水生态和生物技术国家重点实验室,武汉,430072)水利论文)Aa ^+~.Y
林济东,LIN Ji-dong(武汉市水务局,武汉,430014) 
期 刊:环境科学   ISTICPKU  
Journal:CHINESE JOURNAL OF ENVIRONMENTAL SCIENCE  
年,卷(期):2009, 30(11) 
分类号:X703.1 
关键词: 脱氮    碳源    通气管    复合垂直流人工湿地   
Keywords: nitrogen removal    carbon source    aeration pipe    integrated vertical-flow constructed wetland   
机标关键词:碳源调控复合垂直流人工湿地湿地脱氮Constructed WetlandIntegratedcarbon sourcenitrogen removalbiological denitrification葡萄糖carboxymethyl cellulose系统constructed wetland反硝化different外加碳源脱氮效率removal functionimprove投加量通气管 
基金项目:国家自然科学基金,国家水专项,湖北省科技攻关重大项目,武汉市科技攻关项目 
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