颗粒污泥SBR处理生活污水同步除磷脱氮的研究

采用厌氧-好氧的SBR运行方式,以人工配水培养的好氧颗粒污泥为接种污泥,处理碳、氮、SS浓度均较高的生活污水,研究了系统中颗粒污泥的稳定性及其去除有机物和同步除磷脱氮的效果.经过1个月的驯化培养,颗粒污泥即可呈现出良好的污染物去除性能并趋于稳定,反应器中颗粒污泥含量始终占污泥总量的68%以上.颗粒污泥系统污泥浓度为5 000～6000mg/L,SVI值为20～35 mL/g.经过3个月的运行后,反应器中颗粒污泥由原来以粒径0.6～0.9 mm的中等大小颗粒占主体变为粒径＞1.25 mm的大颗粒占主体.稳定运行阶段颗粒污泥系统对COD、TOC、磷酸盐、氨氮、总氮和SS的平均去除率分别为83.04%、70.41%、94.30%、86.51%、41.82%和85.89%.对反应器运行过程中典型周期的分析,反映出颗粒污泥良好的同步除磷脱氮效果.

Simultaneous Phosphorus and Nitrogen Removal of Domestic Sewage with Aerobic Granular Sludge SBR

By seeding aerobic granular sludge cultivated from artificial wastewater, an anaerobic/aerobic SBR was applied to treat domestic sewage of high COD, TN and SS. The stability of granular sludge and the removal of organic pollutants, nitrogen and phosphorus of domestic sewage were investigated. After one month incubation, the reactor had good pollutant removal performances and run stably. The ratio of granular sludge to total suspended solids was over 68% all along. The sludge concentration was 5 000 - 6 000 mg/L and SVI value was 20 35 mL/g. After three months operation, most of the granules were over 1.25 mm instead of 0.6 - 0.9 mm in the beginning. During the stable operation phase of the granular sludge SBR, the average removal effieieneies of COD, TOC, phosphate, ammonium nitrogen, total nitrogen, SS were 83.04 %, 70.41%, 94.30 %, 86.51%, 41.82 % and 85.89 %, respectively. Analysis of the pollutant removal in typical cycle showed that the granular sludge had good simultaneous phosphorus and nitrogen removal performance.