厌氧颗粒污泥在微好氧下降解五氯酚污泥特性

Character of Anaerobic Granular Sludge for Pentachlorophenol Degradation under Microaerobic Condition

以厌氧颗粒污泥为接种污泥,在微好氧条件下(溶解氧浓度在0.2～0.7mg/L范围)对降解五氯酚(PCP)的好氧颗粒污泥培养过程中理化特性的变化进行了研究。培养成熟的微好氧颗粒污泥具有光滑的边缘轮廓,呈球形或椭球形,考察了污泥容积指数(SVI)、挥发性悬浮固体浓度与总悬浮固体浓度比值(VSS/TSS)、粒度分布以及蛋白质(PN)和多糖(PS)的比值PN/PS的变化。在PCP负荷达10mg/L时,对PCP、CODCr和AOX的去除率分别达81.3%,80.8%和80.6%,不存在氯代中间产物,反映了颗粒污泥内部的厌氧菌和外层的好氧或兼性菌都具有较高的活性。

Studies are carried out on formation of microaerobic granular sludge for pentachlorophenol(PCP) degradation under microaerobic condition (DO concentration is controlled at 0.2～0.7 mg/L). Anaerobic granules are selected as seed sludge. The mature granules took on roundness and ellipse with slick brim. The variations of sludge volume index (SVI), ration of volatilized suspended solide to total suspended solide VSS/TSS, ration of protein to polysaccharides PN/PS and the size of sludge are measured during culture. As PCP loading increased to 10 mg/L, PCP、CODCr and AOX removal rates were 81.3%, 80.8% and 80.6%, respectively, and almost no mediated products existed. Both anaerobic bacteria lied in inner section and aerobic bacteria or facultative aerobe lied in external layer of granules had high activity.