电辅助对厌氧折流板反应器处理高浓度有机废水的影响

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

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(CODCr)维持在5 000 mg/L的情况下,研究电辅助位置对CODCr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,CODCr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.

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 CODCrremoval,VFA component and microbial community structure were compared and analyzed. Temperature,hydraulic retention time（ HRT） and influent CODCrconcentration were controlled around（ 35 ± 1） ℃,24 h and 5000 mg/L,respectively. The results showed that the CODCrremoval 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.