污水处理厂尾水硫自养反硝化人工湿地脱氮效果

Effect of Sulfur Autotrophic Denitrification Constructed Wetland on Nitrogen Removal in Tailwater of WWTP

针对目前城市污水处理厂尾水深度脱氮困难的问题,通过模拟试验研究了硫自养反硝化人工湿地对城市污水处理厂尾水的脱氮性能和脱氮途径。结果表明:装置启动后,人工湿地硫自养反硝化区逐渐形成以硫自养菌种(Thiobacillus、Sulfuritalea、Sulfurimonas,占菌群总量的18.06%)为主的微生物群落形态,系统脱氮效果明显;在水力停留时间为24 h时,系统脱氮效果最好,出水硝态氮平均质量浓度为0.2 mg/L,平均去除率为96.4%。该研究成果可以为污水处理厂尾水深度脱氮提供新的思路。

In view of the difficulty of deep denitrification of tailwater of urban wastewater treatment plants(WWTPs),the denitrification performance and denitrification pathway of sulfur autotrophic denitrifying constructed wetland were studied through simulation experiment.Results showed that:After the initiation of the device,the sulfur autotrophic denitrification bacteria(Thiobacillus,Sulfuritalea,Sulfurimonas,accounted for 18.06%of bacterial community)gradually became the dominant bacteria colony,the effect of denitrification was obvious;When hydraulic retention time was 24 h,the effect of nitrate nitrogen removal was the best,the average concentration of nitrate nitrogen of effluent was 0.2 mg/L and the nitrate nitrogen removal rate was 96.4%.The research results can provide a new idea for the deep denitrification of the tailwater of WWTPs.