HRT对3DBER-S工艺深度脱氮同步去除PAEs的影响
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摘要
为研究三维电极生物膜硫自养耦合脱氮(3DBER-S)工艺同步脱氮去除邻苯二甲酸酯(PAEs)的运行特性,分别针对3个水力停留时间(HRT)梯度(12 h→6 h→3 h),研究了耦合系统内总氮(TN)、PAEs去除及硫酸盐、p H变化情况,并分析了系统脱氮途径及PAEs去除能力.结果表明:在不同HRT下,TN去除率在95%左右,出水TN平均质量浓度均在2 mg/L以下;PAEs的平均去除率均超过80%,其中,邻苯二甲酸二丁酯(DBP)的平均去除率达97%以上,邻苯二甲酸二(2-乙基)己酯(DEHP)的平均去除率在83%以上.系统的最佳水力停留时间为6 h,该时段系统出水TN维持在0.80 mg·L-1左右,符合《地表水环境质量标准》中Ⅳ类水质标准的限值(1.5 mg/L);DBP、DEHP的平均去除负荷分别为594.79、188.13 mg/(m3·d).在3DBER-S系统内,单质硫和阴极产生的H2能够弥补由于HRT缩短、进水NO-3-N负荷增加所导致的反硝化电子供体相对不足问题,维持系统高效稳定的脱氮效率;同时,由于填料吸附、生物降解以及化学氧化等作用协同共存,对PAEs具有较强的去除能力.
In order to study the operation characteristics of 3DBER-S( three-dimensional biofilmelectrode reactor coupled with sulfur autotrophic denitrification technology) in the aspect of denitrification and simultaneous removal of PAEs( phthalate esters),the removal of TN( total nitrogen),PAEs,variation of sulfate and p H value as well as the denitrification route and the removal ability of PAEs in the coupling system was traced and analyzed according to three different HRT( hydraulic retention time)which was 12 h,6 h and 3 h respectively. The result show that under different HRT,the removal efficiency of TN is about 95%,the average effluent concentration of TN is under 2 mg / L and the average removal rate of PAEs is above 80%. Also,the average removal rate of DBP( dibutyl phthalate) exceedes97%,while the number of DEHP( di-2-ethylhexyl phthalate) is more than 83%. The systems optimal hydraulic retention time is 6 h,the TN mass concentration of effluent maintaines around 0. 80 mg / L at this time interval,which meet the IV TN standard of Surface Water Environment Quality Standard( 1. 5 mg /L). The average removal loading of DBP and DEHP is 594. 79 mg /( m3·d) and 188. 13 mg /( m3·d)respectively. The elemental sulfur and the hydrogen produced by the cathode can remedy the relative shortage of denitrification electronic donor resulted from HRT decreasing and NO-3-N load increasing in the influent, meanwhile can maintain the high efficiency and stability of the system, the strong elimination capacity of PAEs is due to the synergistic effect of filler absorption,biodegradation and electrochemical oxidation.
In order to study the operation characteristics of 3DBER-S( three-dimensional biofilmelectrode reactor coupled with sulfur autotrophic denitrification technology) in the aspect of denitrification and simultaneous removal of PAEs( phthalate esters),the removal of TN( total nitrogen),PAEs,variation of sulfate and p H value as well as the denitrification route and the removal ability of PAEs in the coupling system was traced and analyzed according to three different HRT( hydraulic retention time)which was 12 h,6 h and 3 h respectively. The result show that under different HRT,the removal efficiency of TN is about 95%,the average effluent concentration of TN is under 2 mg / L and the average removal rate of PAEs is above 80%. Also,the average removal rate of DBP( dibutyl phthalate) exceedes97%,while the number of DEHP( di-2-ethylhexyl phthalate) is more than 83%. The systems optimal hydraulic retention time is 6 h,the TN mass concentration of effluent maintaines around 0. 80 mg / L at this time interval,which meet the IV TN standard of Surface Water Environment Quality Standard( 1. 5 mg /L). The average removal loading of DBP and DEHP is 594. 79 mg /( m3·d) and 188. 13 mg /( m3·d)respectively. The elemental sulfur and the hydrogen produced by the cathode can remedy the relative shortage of denitrification electronic donor resulted from HRT decreasing and NO-3-N load increasing in the influent, meanwhile can maintain the high efficiency and stability of the system, the strong elimination capacity of PAEs is due to the synergistic effect of filler absorption,biodegradation and electrochemical oxidation.
引文
[1]郝瑞霞,张庆康,刘峰,等.再生水厂处理工艺对邻苯二甲酸酯去除效果分析[J].给水排水,2011,37(增刊1):74-78.HAO R X,ZHANG Q K,LIU F,et al.Analysis of removal effects on phthalates in reclaimed water plants[J].Water&Wastewater Engineering,2011,37(Suppl1):74-78.(in Chinese)
[2]孟成成,郝瑞霞,王建超,等.3BER-S耦合脱氮系统运行特性研究[J].中国环境科学,2014,34(11):2817-2823.MENG C C,HAO R X,WANG J C,et al.Study on the performance for a coupled denitrifying system of 3BER-S[J].China Environmental Science,2014,34(11):2817-2823.(in Chinese)
[3]韩卫清.电化学氧化法处理生物难降解有机化工废水的研究[D].南京:南京理工大学,2007.HAN W Q.The study on the treatment of refractory chemical industrial organic wastewater by an electrochemical oxidation[D].Nanjing:Nanjing University of Science and Technology,2007.(in Chinese)
[4]刘俊峰.三维电极生物膜反应器去除地下水中硝酸盐氮与TOC的研究[D].青岛:青岛理工大学,2014.LIU J F.Nitrate nitrogen and TOC removal from groundwater by a three-bioelectrochemical reactor[D].Qingdao:Qingdao Technological University,2014.(in Chinese)
[5]徐焕成.铝碳微电解和生物接触氧化法处理水中PAEs的研究[D].南京:南京林业大学,2014.XU H C.The studies on the treatment of PAEs by the way of Al-C micro-electrolysis and biological contact oxidation[D].Nanjing:Nanjing Forestry University,2014.(in Chinese)
[6]郝瑞霞,张庆康,赵继成,等.固相萃取-气相色谱-质谱测定再生水中邻苯二甲酸酯类物质[J].环境污染与防治,2012,34(5):1-5.HAO R X,ZHANG Q K,ZHAO J C,et al.Determination of phthalates in reclaimed water by SPE-GC-MS[J].Environmental Pollution&Control,2012,34(5):1-5.(in Chinese)
[7]LIANG D,ZHANG T,FANG H H P.Denitrifying degradation of dimethyl phthalate[J].Applied Microbiology and Biotechnology,2007,74(1):221-229.
[8]QAMBRANI N A,JUNG S H,OK Y S,et al.Nitratecontaminated groundwater remediation by combined autotrophic and heterotrophic denitrification for sulfate and p H control:batch tests[J].Environmental Science and Pollution Research,2013,20(12):9084-9091.
[9]王海燕,蔡海军.COD与TOC相关性理论研究[J].河南城建学院学报,2011,20(2):36-40.WANG H Y,CAI H J.Relevant research of TOC and COD in organic wastewater[J].Journal of Henan University of Urban Construction,2011,20(2):36-40.(in Chinese)
[10]胡传侠,杨昌柱,杨群,等.固定化三维电极-生物膜法去除污水中硝酸盐氮[J].环境科学与技术,2008,31(2):83-87.HU C X,YANG C Z,YANG Q,et al.Study on removal of nitrate from by immobilized three-dimension electrodebiofilm reactor[J].Environmental Science&Technology,2008,31(2):83-87.(in Chinese)
[11]国家环境保护总局.地表水环境质量标准:GB3838—2002[S].北京:中国环境科学出版社,2002.
[2]孟成成,郝瑞霞,王建超,等.3BER-S耦合脱氮系统运行特性研究[J].中国环境科学,2014,34(11):2817-2823.MENG C C,HAO R X,WANG J C,et al.Study on the performance for a coupled denitrifying system of 3BER-S[J].China Environmental Science,2014,34(11):2817-2823.(in Chinese)
[3]韩卫清.电化学氧化法处理生物难降解有机化工废水的研究[D].南京:南京理工大学,2007.HAN W Q.The study on the treatment of refractory chemical industrial organic wastewater by an electrochemical oxidation[D].Nanjing:Nanjing University of Science and Technology,2007.(in Chinese)
[4]刘俊峰.三维电极生物膜反应器去除地下水中硝酸盐氮与TOC的研究[D].青岛:青岛理工大学,2014.LIU J F.Nitrate nitrogen and TOC removal from groundwater by a three-bioelectrochemical reactor[D].Qingdao:Qingdao Technological University,2014.(in Chinese)
[5]徐焕成.铝碳微电解和生物接触氧化法处理水中PAEs的研究[D].南京:南京林业大学,2014.XU H C.The studies on the treatment of PAEs by the way of Al-C micro-electrolysis and biological contact oxidation[D].Nanjing:Nanjing Forestry University,2014.(in Chinese)
[6]郝瑞霞,张庆康,赵继成,等.固相萃取-气相色谱-质谱测定再生水中邻苯二甲酸酯类物质[J].环境污染与防治,2012,34(5):1-5.HAO R X,ZHANG Q K,ZHAO J C,et al.Determination of phthalates in reclaimed water by SPE-GC-MS[J].Environmental Pollution&Control,2012,34(5):1-5.(in Chinese)
[7]LIANG D,ZHANG T,FANG H H P.Denitrifying degradation of dimethyl phthalate[J].Applied Microbiology and Biotechnology,2007,74(1):221-229.
[8]QAMBRANI N A,JUNG S H,OK Y S,et al.Nitratecontaminated groundwater remediation by combined autotrophic and heterotrophic denitrification for sulfate and p H control:batch tests[J].Environmental Science and Pollution Research,2013,20(12):9084-9091.
[9]王海燕,蔡海军.COD与TOC相关性理论研究[J].河南城建学院学报,2011,20(2):36-40.WANG H Y,CAI H J.Relevant research of TOC and COD in organic wastewater[J].Journal of Henan University of Urban Construction,2011,20(2):36-40.(in Chinese)
[10]胡传侠,杨昌柱,杨群,等.固定化三维电极-生物膜法去除污水中硝酸盐氮[J].环境科学与技术,2008,31(2):83-87.HU C X,YANG C Z,YANG Q,et al.Study on removal of nitrate from by immobilized three-dimension electrodebiofilm reactor[J].Environmental Science&Technology,2008,31(2):83-87.(in Chinese)
[11]国家环境保护总局.地表水环境质量标准:GB3838—2002[S].北京:中国环境科学出版社,2002.