厌氧预酸化-间歇曝气生物膜系统的生物除磷性能

Performance of Biological Phosphorus Removal in Anaerobic Pre-fermentation and Intermittent Aerated Biofilm System Treating Domestic Wastewater

采用间歇曝气生物滤池与前置厌氧生物滤池组成的生物除磷系统处理生活污水.试验考察了水力负荷以及污染物（有机物、磷酸盐）负荷率对系统运行性能的影响.结果表明,该系统可以有效去除污水中的有机物和磷酸盐.系统水力停留时间HRT为23.3-4.6 h,COD出水平均浓度68 mg/L,平均去除率73.6%;TP出水平均浓度0.59 mg/L,平均去除率85.2%.系统具有良好的适应水力负荷及污染物负荷率变化的能力,运行性能稳定.间歇曝气池采用不同于传统反冲洗的方法去除生物膜中富集的磷,使生物膜反应器在长期连续运行条件下保持良好的吸磷能力,从而延长其运行周期,减少其反冲洗频率.前置厌氧滤池对生活污水的预酸化处理,可以有效提高污水中挥发性脂肪酸的浓度.

A fixed-film system composed of anaerobic biofilter and intermittent aerated biofilter （IABF） was developed for enhanced biological phosphorus removal （EBPR） in treatment of domestic wastewater. Influence of hydraulic, organic, and phosphorus loading on performance of the system was investigated in this study. The result indicates that the system is efficient for the removal of organic and P in the treatment. At a hydraulic retention time of the system of 23.3-4.6 h, the effluent concentration and reduction efficiency of TP and COD are 0.59 mg/L, 68 mg/Lin average and 85.2%, 73.6% in average, respectively. A stable performance of EBPR in the system is achieved with a good adaptability of fluctuations of the loadings. An innovative method instead of traditional backwashing was applied to remove P in biofilm from IABF. The use of the method improves P-uptake capacity in biofilm during long-term operation without wasting, which prolongs operation duration and reduces backwashing frequency in IABF. Pro-fermentation of domestic wastewater in anaerobic biofilter increases concentration of volatile fatty acids in the influent of IABF.