电辅助对厌氧折流板反应器处理高浓度有机废水的影响

为探究电辅助对ABR(厌氧折流板反应器)处理高浓度有机废水效能的影响,在温度为(35±1)℃、HRT(水力停留时间)为24 h、进水ρ(COD_Cr)维持在5 000 mg/L的情况下,研究电辅助位置对COD_Cr去除率、各格室VFA(挥发性脂肪酸)质量浓度和组成以及微生物群落的影响. 结果表明:①电辅助作用于反应器第1格室时,COD_Cr去除率达最大值(83.19%),较对照组提高约15.23%；1#-1格室ρ(乙酸)提高约23.26%,而ρ(丙酸)下降78.09%,说明电辅助能有效提高产氢产乙酸菌丙酸转化乙酸能力,有利于反应器性能提高. ②当电辅助添加在第2格室时,2#-2格室ρ(乙酸)略有下降,而ρ(丙酸)提高近4.2倍,电辅助对水解发酵菌促进效果明显,作用格室表现为乙酸-丙酸发酵类型. ③电辅助ABR各格室微生物群落结构的相似度均在70.0%以下,表明电辅助在强化不同优势菌群的同时改变了微生物种群结构. 

Effects of Electric-Assiston Treatment of High-Strength Organic Wastewater in Anaerobic Baffled Reactor

To further investigate the assisting effect of micro-electricity on high strength organic matters in an anaerobic baffled reactor(ABR), the influences of electrode slide position on COD_Cr removal, VFA component and microbial community structure were compared and analyzed. Temperature, hydraulic retention time (HRT) and influent COD_Cr concentration were controlled around (35±1) ℃, 24 h and 5000 mg/L, respectively. The results showed that the COD_Cr removal rate was as high as 83.19%, about 15.23% higher than that of the control group, when the electrode slide was placed in the first compartment.The corresponding concentration of acetic acid increased by 23.26% and propionic acid decreased by 78.09%, compared with the control group, which indicates that the micro-electricity enhanced the degradation rate of propionic acid through stimulating activity of hydrogen-producing acetogens. The concentration of propionic acid increased 4.2 times when the electricity slide was placed in the second compartment, indicating that the micro-electricity significantly stimulated the activity of hydrolysis fermentation bacteria. Finally, the similarity of the microbial community in every compartment in the electric-assisting ABR experiment was below 70.0%, indicating that the micro-electricity affected the distribution of the microbial community and increased the production of some functional microbial species.