利用生活污水提升厌氧-生物电化学耦合系统处理染料废水的效能及关键功能微生物研究

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.