生物质-硫磺混合营养反硝化体系对尾水中NO3^--N的去除效果  

Removal of nitrate in tail water by biomass-sulfur mixed denitrification process

作　　者：唐诗琴 熊丽丽 蒋睿 毛旭辉[1] TANG Shiqin;XIONG Lili;JIANG Rui;MAO Xuhui(School of Resource and Environmental Sciences, Wuhan University)

机构地区：[1]武汉大学资源与环境科学学院

出　　处：《环境工程技术学报》2020年第3期414-423,共10页Journal of Environmental Engineering Technology

基　　金：湖北省国际合作项目(2018AHB016);广东省科技项目(2017B090901029)。

摘　　要：生活污水经二级处理工艺处理后排放,尾水NO-3-N浓度仍较高。构建了生物质-硫磺混合营养反硝化体系,对其去除NO-3-N的效果进行了研究。静态试验结果表明:木屑-硫磺混合营养反硝化体系能在较短的时间内去除NO-3-N,反应速率常数为0.0416 d-1,且NO2^--N、NH4^+-N转化量低;初始pH为6~9、木屑与硫磺配比为0.5~2.0时,对反硝化过程影响不大,铁屑的添加对体系的pH具有一定的调控作用。动态试验结果表明:含有50 g硫磺和25 g木屑的混合营养反硝化体系,对初始浓度为15 mg/L的NO-3-N有较好的去除效果,去除率接近90%;通过改变木屑与硫磺配比或加入铁屑能适当提高高浓度NO-3-N的去除率,其中,50 g硫磺+50 g木屑的反硝化体系在NO3^--N浓度为30 mg/L时,也能维持约90%的去除率。初始NO-3-N浓度会对反应柱内微生物群落的丰度产生一定影响,但对微生物群落的结构基本没有影响。Tail water containing relatively high concentration of NO3^--N is often discharged even after secondary treatment process.A biomass-sulfur mixed denitrification system was constructed for the treatment of elevated concentration of NO3^--N in tail water,and its performance for the removal of NO3^--N was studied.The results of static experiments showed that woodchips-sulfur mixed denitrification system had good performance for the removal of nitrate(reaction rate constant 0.0416 d-1)with the least conversion of NO3^--N and NH4^+-N.The initial pH within the range of 6-9,and the woodchip/sulfur ratio of 0.5-2.0 had insignificant effect on the mixed denitrification process.The addition of iron fillings had a certain regulating effect on the pH of the system.In the dynamic experiments,mixed denitrification system with 50 g sulfur plus 25 g woodchips had a good removal effect on NO3^--N with initial concentration of 15 mg/L,and the removal efficiency of NO-3-N could reach 90%.The removal rate of high NO3^--N concentration of mixed denitrification system could be improved by changing the proportion of woodchips and sulfur or adding iron sawdust.Among the trials,mixed denitrification system of 50 g sulfur and 50 g woodchips could maintain a removal efficiency of 90%even for 30 mg/L of NO3^--N.Different initial NO3^--N concentrations had some effect on the abundance of microbial community in the reaction column,but had little effect on the structure of microbial community.

关 键 词：混合反硝化 硝态氮 生物质 废水处理 木屑 

分 类 号：X703[环境科学与工程—环境工程]