厌氧水解-SNAD工艺处理低碳氮比农村生活污水

为解决农村生活污水的高效除碳脱氮问题,以厌氧水解-同时硝化反硝化厌氧氨氧化(SNAD)工艺处理低C/N比农村生活污水。实验结果表明:水解酸化单元进水C/N比为2∶1时,COD的去除率达到69%;产物VFA主要成分为乙酸、丙酸和正丁酸,平均含量分别为88.4%、6.5%与5.1%,VFAs/COD比为0.74;出水C/N比为3∶5。水解酸化单元出水进入SNAD脱氮单元,通过亚硝化、反硝化与厌氧氨氧化的耦合作用,该单元COD与总氮的去除率分别可达到76.7%和84.1%。厌氧水解-SNAD组合工艺COD与总氮总去除率分别达到92.8%和84.1%。

Treatment of rural sewage with low carbon/nitrogen ratio by anaerobic hydrolysis-SNAD process

In order to solve the problem of removal of carbon and nitrogen of rural sewage, the paper used an anaerobic hydrolysis-SNAD process to treat this kind of wastewater with low C/N ratio. The results show that, when the C/N ratio of influent in hydrolysis acidification unit is 2 to 1, the removal efficiency of COD reaches 69%. The main components of VFAs are acetic acid, propionic acid and ethacetic acid.The average contents are 88.4%, 6.5% and 5.1% respectively. Meanwhile the ratio of VFAs and COD reaches 0.74 and the ratio of C/N in effluent is 3 to 5. The hydrolysis acidification unit come into SNAD nitrogen removal unit, through the action of the coupling of partial nitrification, denitrification and anammox, the removal efficiencies of COD and total nitrogen reach 76.7% and 84.1% respectively. The removal ratio of COD and total nitrogen by using anaerobic hydrolysis-SNAD combined process reach 92.8% and 84.1% respectively.