She Li-Hua, He Feng, Xu Dong, Lin Ji-Dong, Wu Zhen-Bin
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Huan Jing Ke Xue. 2009 Nov;30(11):3300-5.
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 removalfunction 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 x d(-1) hydraulic load was the optimization for denitrification. C6H12O6:NO3(-) -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.
碳源是影响生物脱氮效率的主要因素。在中国大多数城市，污水中的碳含量较低，因此应考虑补充碳源，以提供生物脱氮过程所需的电子供体。研究了通过垂直流人工湿地（IVCW）的曝气管添加不同碳源对氮去除的影响。向IVCW底部补充碳源可以改善微生物环境，增强IVCW的脱氮功能。结果表明，在脱氮方面，葡萄糖作为外部碳源优于羧甲基纤维素（CMC）。IVCW系统中添加葡萄糖和不添加碳源之间的氮去除存在显著差异（p < 0.05）。通过添加不同量葡萄糖的实验，在60 L·d⁻¹水力负荷下，1.5 g葡萄糖的投加量是脱氮的最佳值。C6H12O6:NO3⁻-N为4.3，远低于在进水口添加时的比例。因此，通过曝气管向IVCW底部补充碳源可以节省碳源补充成本。此外，在进水前四小时添加葡萄糖可以提高氮去除率。
