• 关键词：厌氧-生物电化学耦合系统  橙黄Ⅱ废水  生活污水  电解质  脱色率

• 基金项目：国家自然科学基金面上项目（No.21577162）

• 席尚东
• 哈尔滨工业大学, 城市水资源与水环境国家重点实验室, 哈尔滨 150090

• 高磊
• 哈尔滨工业大学, 城市水资源与水环境国家重点实验室, 哈尔滨 150090

• 刘文宗
• 中国科学院生态环境研究中心, 环境生物技术重点实验室, 北京 100085

• 王爱杰
• 1. 哈尔滨工业大学, 城市水资源与水环境国家重点实验室, 哈尔滨 150090;2. 中国科学院生态环境研究中心, 环境生物技术重点实验室, 北京 100085

• 摘要：构建了厌氧生物处理过程与生物电化学过程耦合（AD-BES）的废水处理系统，以生活污水为碳源，研究了AD-BES系统对偶氮染料橙黄Ⅱ的强化去除效果，分析并优化了AD-BES反应器降解橙黄Ⅱ染料的关键影响因素，包括生活污水所占比例、电解质Na₂SO₄的浓度等因子.结果表明，生活污水作为廉价碳源能够有效提升橙黄Ⅱ的脱色效率.在8 h降解时间内，生活污水所占比例为1时的脱色效率比生活污水所占比例为1/3时提升了35.8%.进一步研究发现，通过添加电解质Na₂SO₄能够继续提高橙黄Ⅱ的脱色效率，在0~0.025 mol·L^-1 Na₂SO₄范围内，随着Na₂SO₄浓度的提高，脱色效率持续升高，通过优化，在0.025 mol·L^-1时反应4 h后脱色率达到90.1%，7 h后达到98%，对COD的去除量达到159 mg·L^-1.通过对碳纤维电极进行扫描电镜（SEM）测试和电极上的生物膜高通量基因测序，发现在微电流刺激下碳纤维电极上快速富集了相对丰度较大的功能菌群，主要包括具有胞外电子传递能力的Proteobacteria（变形菌门）和降解复杂碳源能力的Bacteroidetes（拟杆菌门）中的功能菌属.

• Abstract：Azo dye reductive dechlorination was studied in a constructed anaerobic digestion-bioelectrochemical system(AD-BES) when applying domestic sewage as an efficient electron donor. The key operation factors that influenced Orange Ⅱ reduction efficiencies were investigated and were optimized in AD-BES, including the proportion of domestic sewage and concentration of Na₂SO₄ as electrolyte. Results show that decolorization efficiency of Orange Ⅱ increased along with the increase of domestic sewage proportion. Decolorization rate was increased by 35.8% when sewage inoculation ratio improved to 1 compared with that of 1/3 at 8 h. Using Na₂SO₄ as electrolyte can improve the reduction efficiency and the higher efficiency was achieved when the concentration of Na₂SO₄ was increased among 0~0.025 mol·L^-1. Under the optimized Na₂SO₄ concentration of 0.025 mol·L^-1, the decolorization efficiency reached to 90.1% at 4 h, and increased to the maximum of 98% along with COD removal of 159 mg·L^-1 at 7 h. Scanning electron microscopic observation results show a great deal of microorganisms attached on the carbon fiber. Bacteroidetes and Proteobacteria played important parts in Orange Ⅱ reduction and extracellular electron transfer.

• Key words：anaerobic digestion-bioelectrochemical system  Orange Ⅱ contained wastewater  domestic sewage  electrolyte  decolorizing efficiency

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