生物强化自发电化学氧化含硫废水及关键功能微生物研究

Biological enhanced spontaneous electrochemical oxidation of sulfide and the functional microbial community in this system

构建了以高锰酸钾溶液为阴极电子受体,石墨棒为电极的硫化物自发电化学氧化系统.该系统可自发电化学氧化硫化物,去除率为68.15%~89.30%,其主要氧化产物为单质硫(68.10%~86.63%),且最大氧化速率可达34.76 mg·L^(-1)·h^(-1),最大稳定电流密度为37.38 mA·m^(-2).经生物强化后,该系统的硫化物去除率高于99.80%,其主要氧化产物为硫酸盐(21.98%~74.43%)和单质硫(25.43%~78.02%),其最大氧化速率可达45.90 mg·L^(-1)·h^(-1),最大稳定电流密度为36.61 mA·m^(-2).并通过高通量测序分别从门和属分类水平对生物强化系统阳极室内污泥细菌群落进行分析,相对丰度较高的是具有硫化物氧化功能的变形菌门和具有胞外电子传递能力的拟杆菌门.

A spontaneous electrochemical sulfide oxidation system was constructed, with potassium permanganate solution as cathode electron acceptor and graphite rods as electrodes. The system could oxidize sulfide spontaneously, and the removal percentage is in the range of 68.15%~89.30%, while the main oxidation product is elemental sulfur(68.10%~86.63%). The maximum sulfide oxidization rate could reach 34.76 mg·L^(-1)·h^(-1), and the maximum stable current density is as high as 37.38 mA·m^(-2). After biological enhancement, sulfide removal percentage is higher than 99.80%, and the main oxidation products are sulfate(21.98%~74.43%) and elemental sulfur(25.43%~78.02%). The maximum sulfide oxidization rate could reach 45.90 mg·L^(-1)·h^(-1), and the maximum stable current density is as high as 36.61 mA·m^(-2). Taxonomic distribution of archaeal community in suspension sludge of anode chamber was presented by high-throughput sequencing from phylum level to genus level, in which Proteobacteria with sulfide oxidation function and Bacteroides with extracellular electron transfer capacity are relatively abundant.