序批式颗粒污泥系统中磷的变化和去向分析

Analysis of the fate and variation of phosphorus in a granular sludge sequencing batch reactor (SBR)

在实验室序批式活性污泥法(SBR)处理系统中以普通活性污泥为接种污泥,采用厌氧-好氧的运行方式提高系统的除磷效果.同时培养颗粒污泥,并对系统中磷的变化和去向进行分析.结果表明,整个试验共运行146 d,成熟颗粒污泥平均粒径为603μm,污泥体积指数(SVI)约为30 mL.g-1,COD去除率可达90%,磷的去除率可达95%左右.颗粒污泥系统除厌氧放磷和好氧聚磷以外,还存在明显的污泥颗粒积磷现象.磷的去除途径主要为:系统排泥(出水悬浮物和专门排泥)和污泥积磷.由厌氧末期颗粒污泥的X射线衍射(XRD)分析结果可知,化学沉淀是污泥积磷的一种重要方式,大量的金属离子会与磷形成无机盐沉积在污泥颗粒上.

A laboratory sequencing batch reactor（SBR） was fed with activated sludge flocs for simultaneous phosphorus removal and granulation by control of the anaerobic-aerobic operational modes.After 146 days,the average particle size of mature granules was about 603μm;sludge volume index（SVI） was about 30 mL.g-1;COD removal rate was up to 90%;and phosphorus removal rate was up to 95%.Analysis of the fate of phosphorus showed that phosphorus accumulates in the granular sludge besides the anaerobic phosphorus release and aerobic phosphorus uptake in the granular sludge system.The phosphorus removal pathways mainly include sludge discharge（suspended solid and excess sludge discharge） and phosphorus accumulation in the sludge.The results of X-ray diffraction analysis of granular sludge from the end of the anaerobic phase indicate that chemical precipitation is an important mode of phosphorus accumulation in sludge.Inorganic salts formed by metal ions and phosphate accumulated in the granular sludge.