低碳氮比猪场废水短程硝化反硝化-厌氧氨氧化脱氮

Removing Nitrogen from Low-C/N-Piggery-Wastewater Using Shortcut Nitrification/denitrification-ANAMMOX

针对低碳氮比猪场废水传统脱氮法碳源不足的问题,采用SBBR反应器进行短程硝化反硝化-厌氧氨氧化联合脱氮.实验表明,短程硝化反硝化预处理可为厌氧氨氧化创造良好的进水条件;经预处理的猪场废水厌氧氨氧化脱氮效果显著,氨氮、亚硝态氮和总氮的平均去除率分别为91.8%、99.3%、84.1%,废水中残留有机物未对厌氧氨氧化效果产生明显影响,氨氮、亚硝态氮、硝态氮平均变化量之比为1∶1.21∶0.24.色质联用分析结果显示,猪场废水中有机物成分在厌氧氨氧化反应前后未发生明显变化,主要化合物为酯类和烷烃类物质;特殊功能菌种检测结果表明,实验条件下的微生物系统是一个厌氧氨氧化菌与硝化菌、亚硝化菌和反硝化菌共存的系统,厌氧氨氧化菌是该系统主要脱氮功能菌.

Aiming at the problem of deficiency of organic carbon source in piggery wastewater treatment by traditional method, shortcut nitrification/denitrification-ANAMMOX was used to remove nitrogen in piggery wastewater with low C/N in SBBR reactors. The results showed that shortcut nitrification/denitrification provided good influent conditions for ANAMMOX. High nitrogen removal efficiency of piggery wastewater by ANAMMOX was achieved and the average removal percentage of ammonium, nitrite and total nitrogen reached 91.8%, 99.3%, 84.1%, respectively. The performance of ANAMMOX process was not affected by the residual organic compounds in piggery wastewater. The average variation ratio of ammonium, nitrite and nitrate was 1 ： 1.21：0.24. The analysis of GC/MS showed that there was little difference between the organic compounds i：n iaffuent and effluent of ANAMMOX, and main organic compounds were saturated hydrocarbon and ester. The microorganism system was compesed of anammox bacteria, ammonium oxidizer, nitrite oxidizer and denitrification bacteria together, and ANAMMOX bacteria was the main functional bacteria for nitrogen removal in this system.