苯酚对好氧颗粒污泥处理建筑涂料废水的影响及机制

Impact and Mechanism of Phenol on Aerobic Granular Sludge Treatment of Building Coating Wastewater

苯酚是建筑涂料常被使用的物质,然而苯酚对好氧颗粒污泥(AGS)处理建筑涂料废水过程内污泥颗粒化进程及运行效能的影响很少被研究。为填补相关研究工作空白,本研究考察了苯酚浓度对AGS处理建筑涂料废水过程内污泥颗粒化及运行效能的影响并分析了相关机制。结果表明低于0.2 mg/L苯酚对AGS影响不明显,而超过2.0 mg/L苯酚降低了AGS颗粒化进行并降低了AGS处理建筑涂料废水的效能。机制分析表明高浓度苯酚降低了AGS内污泥浓度,并减少了有机质占比,此外高浓度苯酚提高了胞外聚合物(EPS)包括SB-EPS和LB-EPS的含量。超过2.0 mg/L苯酚降低了AGS处理废水的运行效能,其在20.0 mg/L苯酚组别内,COD、NH_(4)^(+)-N和总氮(TN)去除率下降至81.6%~83.5%、81.6%~84.5%和50.8%~51.9%。此外,高浓度苯酚降低了比耗氧速率,降低了微生物代谢,进而导致营养盐去除受抑制。研究结果为AGS处理含苯酚的建筑涂料废水提供了一定的数据支撑。

Phenol is a commonly used substance in building coatings,but its impact on the granulation process and operational efficiency of aerobic granular sludge(AGS)treatment of building coatings has been rarely explored.To fill the relevant gap,this study investigated the effect of phenol concentration on sludge granulation and operational efficiency during the AGS treatment of building paint wastewater,and analyzed the relevant mechanisms.The results showed that phenol below 0.2 mg/L had no significant effect on AGS,while phenol above 2.0 mg/L reduced AGS granulation and reduced the efficiency of AGS in treating building paint wastewater.Mechanism analysis shows that high concentration of phenol reduces the sludge concentration within AGS and reduces the proportion of organic matter.In addition,high concentration of phenol increases the content of extracellular polymers(EPS),including SB-EPS and LB-EPS.More than 2.0 mg/L phenol reduced the operational efficiency of AGS treatment of wastewater.Within the 20.0 mg/L phenol group,the removal rates of COD,NH_(4)^(+)-N,and total nitrogen(TN)decreased to 81.6%~83.5%,81.6%~84.5%,and 50.8%~51.9%.In addition,high concentrations of phenol reduce the specific oxygen consumption rate and microbial metabolism,leading to inhibition of nutrient removal.The research results provide certain data support for AGS treatment of building paint wastewater containing phenol.