硫磺/零价铁联合强化潜流人工湿地脱氮除磷性能  

Enhanced Removal for Nitrogen and Phosphorus by Using Sulfur and Zero-valent Iron in Submerged Constructed Wetland

作　　者：曲立民 高彦博 QU Li-min;GAO Yan-bo(Yantai Urban Drainage Service Center,Yantai 264013,China)

机构地区：[1]烟台市城市排水服务中心,山东烟台264013

出　　处：《中国给水排水》2023年第14期102-108,共7页China Water & Wastewater

摘　　要：污水处理厂尾水中的氮、磷含量显著高于地表水环境质量标准,在其排放前有必要进行进一步深度净化。构建了四组潜流湿地系统,在系统HRT=2 d时,对比研究了硫磺、零价铁、硫磺+零价铁的添加对潜流湿地脱氮除磷效能的影响。为期10个月自然状态下的连续运行结果表明,硫磺能够显著提高湿地系统的反硝化脱氮性能,总氮平均去除率达到80%以上,但是出水中硫酸根含量会超过250 mg/L;零价铁能够将出水中总磷含量降至0.1 mg/L以下,但是脱氮强化作用不显著;硫磺与零价铁联合能够显著提高湿地系统脱氮除磷能力,出水中硫酸根和总铁含量也处于较低水平,且湿地系统的氧化亚氮排放量也处于较低水平,表明硫磺/零价铁联合适用于潜流湿地深度净化污水处理厂尾水。The contents of nitrogen and phosphorus in wastewater treatment plant(WWTP)effluent were higher than the standard of Environmental Quality Standards for Surface Water(GB 3838-2002),and it is essential to decrease their concentrations before discharging into the receiving water body.In this study,four submerged constructed wetlands were installed to investigate the influence of the addition of sulfur,zero-valent iron,sulfur and zero-valent iron on the removal for nitrogen and phosphorus.Ten months continuous operation results showed the sulfur could enhance the denitrification significantly(the average removal rate of total nitrogen was over 80%)while the sulfate in effluent was more than 250 mg/L.Phosphorus in effluent could decreased to below 0.1 mg/L with the usage of zero-valent iron,but its enhanced nitrogen removal was not obvious.It is observed that the combination of sulfur and zero-valent iron in wetland could enhance the removal ability for nitrogen and phosphorus,meanwhile sulfate and total ferrous in effluent were in low concentrations,and a low emission of nitrous oxide was obtained as well.Therefore,it is showed that the combination usage of sulfur and zero-valent iron is suitable for advanced purification of WWTP effluent.

关 键 词：污水处理厂尾水 潜流人工湿地 硫磺/零价铁 脱氮除磷 氧化亚氮 

分 类 号：TU992[建筑科学—市政工程]