AnEMBR-IFFAS耦合工艺处理石化废水  

Performance of AnEMBR-IFFAS combined processes treating petrochemical wastewater

作　　者：陈东瑞 刘涛 乔森[1] CHEN Dongrui;LIU Tao;QIAO Sen(Key Laboratory of Industrial Ecology and Environmental Engineering,Ministry of Education,School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学环境学院,工业生态与环境工程教育部重点实验室,大连116024

出　　处：《环境工程学报》2023年第4期1355-1364,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2019YFA0705804)。

摘　　要：石化废水具有成分复杂、生物毒性和可生化性差等特点,废水中的高浓度耗氧有机物(以COD计)以及有毒物质会抑制生物活性,传统厌氧/好氧工艺在处理此类废水时难以达到理想效果。为强化生物处理效果,构建了一种新型电化学强化厌氧膜生物反应器(AnEMBR)与基于悬浮生物载体的生物膜与活性污泥复合工艺(IFFAS)处理实际石化废水。通过AnEMBR构建的生物电化学系统去除COD,并通过IFFAS内的改性载体实现同步硝化反硝化(SND)以去除NH4+-N和TN。运行期间COD去除率大于95%,在-1.2 V的外加电压下缓解不可逆膜污染并回收沼气(CH4占比90.7%)。稳定运行阶段的COD、 NH4+-N、 TN的平均去除率可达到97.9%、93.1%和72.2%,平均出水COD为52.11 mg·L^(-1)、NH4+-N为3.70 mg·L^(-1)、TN为15.19 mg·L^(-1),达到了《石油化学工业污染物排放标准》(GB 31571-2015)。以上研究结果可为石化废水强化生物处理提供参考。Petrochemical wastewater is characterized by complex composition,biotoxicity and poor biodegradable properties,and its high concentration oxygen consumption organic matter(calculated by COD)and toxic substances can inhibit biomass activity,which makes it difficult for the conventional anaerobic/aerobic process to achieve the desired treatment performance.To enhance the biological treatment,a novel anaerobic electro-assisted membrane bioreactor(AnEMBR)with integrated free-floating biofilm and activated sludge(IFFAS)based on modified carriers was constructed to treat actual petrochemical wastewater.The bioelectrochemical system was built to remove COD through AnEMBR,the simultaneous nitrification and denitrification(SND)process was constructed to remove NH_(4)^(+)-N and TN with the addition of modified carriers inside IFFAS.The results showed that during the operation,the COD removal rate was greater than 95%,while irreversible membrane fouling was relieved at an applied voltage of−1.2 V and biogas was recovered(CH4 accounted for 90.7%).The average removal rates of COD,NH_(4)^(+)-N and TN at the stable operation stage could reach 97.9%,93.1%and 72.2%,respectively,and the average effluent COD,NH_(4)^(+)-N and TN were 52.11 mg·L^(−1),3.70 mg·L^(−1) and 15.19 mg·L^(−1),respectively.They all met the standard of Petroleum Chemical Industry Pollutant Discharge(GB 31571-2015),which can provide a support for the enhanced biological treatment of petrochemical wastewater.

关 键 词：石化废水 电化学强化厌氧膜生物反应器 膜污染 同步硝化反硝化 

分 类 号：X703[环境科学与工程—环境工程]