电强化SBR工艺处理苯酚废水及群落动态解析

Enhanced treatment of phenol wastewater by electricity-assisted SBR process and community dynamics analysis

为了提高苯酚废水的处理效率,构建电强化SBR体系(简称E-SBR体系),考察了E-SBR体系在施加电压和去除电压后对苯酚和COD的降解效率,利用高通量测序揭示了微生物群落的动态变化规律。结果表明,E-SBR体系施加电压和去除电压后对苯酚和COD的降解效率均显著高于单独的电极体系与单独的SBR体系之和,生物降解和电极降解间存在耦合协同效应。相比于单独SBR体系而言,E-SBR体系微生物群落的多样性和丰富度增强。Bacillus、Pseudomonas、Rhizobium以及Sphingomonas为E-SBR体系中优势菌,其含量显著高于单独SBR体系,施加电场促进了优势菌的生长并且提高了处理效率。

An electricity-assisted sequencing batch reactor (designated as E-SBR) was built to improve the treatment performance of phenol wastewater in this study.The degradation rates of phenol and COD in E-SBR with and without voltage were investigated,respectively.Illumina high-throughput sequencing analysis was used to reveal the dynamic changes of microbial community.The results indicated that the degradation of phenol and COD by the E-SBR with and without voltage were significantly higher than the sum of a single electrode system and SBR system.This confirmed a coupling effect between biodegradation and electro-catalytic degradation process.The diversity and richness of the microbial community in the E-SBR system was enhanced compared with the single SBR system. Bacillus 、 Pseudomonas 、 Rhizobium and Sphingomonas were the dominant genus in the E-SBR.Their contents were higher than those of single SBR system,which indicates that electrical stimulation could promote the growth of these dominant genus and then enhance the treatment performance of E-SBR.