Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China.
Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China.
Bioresour Technol. 2019 Mar;276:97-102. doi: 10.1016/j.biortech.2018.12.099. Epub 2018 Dec 27.
Phenol and ammonia are prevalent toxic pollutants in various industrial wastewaters, but phenol degraders are frequently inhibited by high concentration of ammonia. Hydrogen enrichment was developed to alleviate ammonia inhibition on anaerobic digestion of phenol-containing wastewater. Results indicated that the endurance to ammonia of sludge was improved greatly by hydrogen enrichment at higher ammonia concentration (from 2 to 8 g NH-N/L) compared with the control group. Furthermore, phenol utilization rate of sludge was gradually enhanced with the increase of initial hydrogen partial pressure (HPP) at ammonia concentration of 2 g NH-N/L and the maximum rate of 199.75 mg/g VSS/d was achieved under 0.8 atm HPP. The maximum SMA of acetate and hydrogen was 0.61 and 0.45 g COD-CH/g VSS/d, respectively under 0.8 atm HPP. Three hydrogen-consuming pathways including homoacetogenesis, hydrogenotrophic methanogenesis and benzoate generation played the critical roles in enhancing anaerobic digestion of phenol by hydrogen enrichment under high ammonia concentration.
苯酚和氨是各种工业废水中常见的有毒污染物，但高浓度的氨经常抑制苯酚降解菌。富氢被开发用来缓解含苯酚废水中的氨抑制作用。结果表明，与对照组相比，在较高氨浓度（2 至 8gNH-N/L）下，富氢可大大提高污泥对氨的耐受性。此外，在氨浓度为 2gNH-N/L 时，随着初始氢分压（HPP）的增加，污泥对苯酚的利用率逐渐提高，在 0.8atmHPP 下达到 199.75mg/gVSS/d 的最大速率。在 0.8atmHPP 下，乙酸和氢的最大 SMA 分别为 0.61 和 0.45gCOD-CH/gVSS/d。在高氨浓度下，富氢通过三种氢消耗途径（同型产乙酸、氢营养型甲烷生成和苯甲酸生成）对增强苯酚的厌氧消化起着关键作用。
