污泥转移序批式间歇活性污泥法(SBR)工艺除磷特性

Characteristics of phosphorus removal in the Sludge-Shifting SBR Process

污泥转移序批式间歇活性污泥法(SBR)工艺是由连续运行的生物选择器和数个并联的SBR主反应器构成的,通过污泥回流的方式提高了SBR反应阶段的活性污泥量并削减了沉淀阶段的污泥总量,从而强化其除污能力,并提高其容积利用率.新工艺处理城市生活污水的试验结果表明,污泥转移量对系统除磷影响显著;当污泥转移量为0、15%和30%时系统出水总磷的平均去除率分别为16.5%、74%和93%;生物选择器中厌氧释磷量与污泥中PHB(聚-β-羟基丁酸)含量呈现良好的正相关性.在适宜的运行模式下,SBR充水比45%、污泥龄10 d、污泥转移量30%,系统对总磷的平均去除率能达到93%以上,出水总磷浓度可控制在0.30 mg.L-1以下,且其它出水各项水质指标均能达到国家排放标准的要求.

The Sludge-Shifting SBR Process consists of a continuously running bio-selector and multi-SBRs,aimed to improving the pollutant removal ability of SBR through increasing biomasses in the reaction stage and raising utilization of the working volume of the reactor through decreasing biomasses in the settling stage by means of returning sludge.The updated process was tested for municipal wastewater treatment,the results show that the phosphorus removal was significantly affected by the sludge shifting volumes.The average removal ratios of total phosphorus could be 16.5%,74% and 93% respectively when the sludge shifting volumes were 0,15%and 30%.Anaerobic phosphorus release was positively related with the PHB（poly-β-hydroxybutyric acid） content of sludge in the bio-selector.While the water filling ratios of SBR were 45% in the appropriate operation mode,the sludge age was 10 days and the sludge shifting volumes were 30%,the average removal ratio of total phosphorus was up to 93% and the total phosphorus concentrations in the effluent could be under 0.30 mg · L-1 in the system,and the other effluent quality met the requirements of the national state discharge criteria.