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HRT对城市污水厂尾水反硝化深度脱氮的影响

苑 泉 王海燕 刘 凯 杭前宇 赵 萌

苑 泉, 王海燕, 刘 凯, 杭前宇, 赵 萌. HRT对城市污水厂尾水反硝化深度脱氮的影响[J]. 环境科学研究, 2015, 28(6): 987-993.
引用本文: 苑 泉, 王海燕, 刘 凯, 杭前宇, 赵 萌. HRT对城市污水厂尾水反硝化深度脱氮的影响[J]. 环境科学研究, 2015, 28(6): 987-993.
YUAN Quan, WANG Haiyan, LIU Kai, HANG Qianyu, ZHAO Meng. Effects of HRT on Denitrification for Advanced Nitrogen Removal of Wastewater Treatment Plant Effluent[J]. Research of Environmental Sciences, 2015, 28(6): 987-993.
Citation: YUAN Quan, WANG Haiyan, LIU Kai, HANG Qianyu, ZHAO Meng. Effects of HRT on Denitrification for Advanced Nitrogen Removal of Wastewater Treatment Plant Effluent[J]. Research of Environmental Sciences, 2015, 28(6): 987-993.

HRT对城市污水厂尾水反硝化深度脱氮的影响

基金项目: 国家水体污染控制与治理科技重大专项(2014ZX07216-001)

Effects of HRT on Denitrification for Advanced Nitrogen Removal of Wastewater Treatment Plant Effluent

  • 摘要: 污水厂尾水回用作为水源时,其ρ(TN)较高是亟待解决的问题. 在调研污水厂尾水水质的基础上,利用MBBR(移动床生物膜反应器)对其进行深度脱氮,并考察HRT(水力停留时间)对不同填料(聚乙烯和陶粒)的MBBR运行效果的影响. 结果表明,NO3--N是尾水中氮的主要形态,其质量浓度约占ρ(TN)的80.8%±8.4%. HRT分别为12、8和4 h时,对NO3--N去除率影响不大,均能达到90%以上,但反硝化能力随着HRT的缩短而成倍增加;HRT为4 h时各反应器的反硝化能力最大,聚乙烯和陶粒MBBR中分别为(28.4±14.5)和(27.4±14.3)mg/(L·d)(以NO3--N计). 随着HRT的减少,CODCr去除率呈降低趋势. 三维荧光分析表明,进、出水中均含有类富里酸和类蛋白质等DOM物质. HRT为8 h时MBBR对DOM的去除率最高,聚乙烯填料MBBR对有机污染物的去除效果略优于陶粒填料. 综合考虑氮和有机污染物去除效能,聚乙烯和陶粒填料MBBR优化HRT均为8 h.

     

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