摘要
为解决城市污水厂尾水再生利用时ρ(TN)高的问题,采用反硝化MBBR(移动床生物膜反应器)对城市污水厂尾水进行反硝化脱氮,并重点研究不同温度下分别以聚乙烯和聚丙烯为填料的反硝化MBBR的运行效果.结果表明:在HRT(水力停留时间)为12 h、温度分别为13、19、25和30℃时,NO_3^--N去除率和反硝化能力变化不大,聚乙烯和聚丙烯反硝化MBBR的NO_3^--N去除率分别为80.1%~85.0%和78.2%~84.0%,二者的反硝化能力分别为6.7~7.1和6.5~7.0 mg/(L·h);较长的HRT弥补了低温时反硝化速率低的不足;随温度增加,生物量逐渐增加,但COD_(Cr)和DOM(溶解性有机物)的去除率变化不明显.三维荧光图谱表明,出水中主要的DOM(溶解性有机质)为类色氨酸和类富里酸,聚乙烯和聚丙烯反硝化MBBR对DOM总荧光强度的去除率分别为47.6%~52.5%和24.1%~35.8%.填料上的微生物以杆菌、丝状菌和球菌为主.综合考虑脱氮效能和有机物污染物去除效能,聚乙烯和聚丙烯反硝化MBBR深度脱氮的最佳温度均为25℃.
High total nitrogen content is an urgent issue for the reuse of Wastewater Treatment Plant（ WWTP） effluent. A Moving Bed Biofilm Reactor（ MBBR） was selected for the denitrification of WWTP effluent,and the influence of temperature on the performance of denitrification MBBRs filled with polyethylene（ PE） or polypropylene（ PP） carriers was intensively studied. Under 12 h hydraulic retention time（ HRT）,13,19,25 and 30 ℃ operation conditions,NO3^--N removal and denitrification capacity were slightly influenced by variation of temperature,and NO3^--N removal of PE and PP denitrification MBBR were 80. 1%-85. 0% and 78. 2%-84. 0%. The denitrification rates were 6. 7-7. 1 and 6. 5-7. 0 mg/（ L·h） accordingly,which might have resulted from the compensation of long HRT for the denitrification deficiency at low temperature. The biomass increased with the temperature increase, however, and the removal rate of carbon oxygen demand（ CODCr） and dissolved organic matter（ DOM） did not change obviously. Threedimensional fluorescence spectra showed that the tryptophan-like and fulvic acid were the main kinds of DOM, and the total removal of DOM fluorescence intensity was about 47. 6%-52. 5%and 24. 1%-35. 8% for PE MBBRs and PP MBBRs, respectively. SEM micrographs showed that cocci, bacilliand filamentous microorganisms were predominant on the carriers biofilm. Considering the nitrogen and organic removal as a whole,25 ℃ is recommended as the optimum temperature for nitrogen removal from WWTP effluent by denitrification MBBRs.
出处
《环境科学研究》
EI
CAS
CSSCI
CSCD
北大核心
2016年第6期877-886,共10页
Research of Environmental Sciences
基金
国家水体污染控制与治理科技重大专项(2014ZX07216-001)
作者简介
刘凯（1986-），男，河南平顶山人，470012574@qq．com．
责任作者，王海燕（1976-），女，河南南阳人，研究员，博士，主要从事水污染控制原理与技术研究，wanghy@crse8．org．cn
