A2N系统中低碳污水的反硝化除磷优化及运行稳定性

采用序批式生物移动床（SBMBBR），通过优化反应条件可以取得较高的聚-β-羟基丁酸盐（PHB）富集效率，通过双泥系统的操作，可以实现低碳下的高效反硝化除磷.在进水COD 200 mg/L、pH为中性的生活污水中，并在搅拌速度为80 r/min下，磷的去除率达到83.7%，NO^-₃-N的去除率达到81.4%，NO^-₂-N的去除率接近100%，取得较好的反硝化除磷作用.较大的生物量是保证较高效率的反硝化除磷的关键之一.采用双泥系统运行SBMBBR，可以获得稳定的、较高效率的脱氮除磷.在COD为140～170 mg/L, TN为34～42 mg/L低碳氮比的实际废水处理中，磷的去除率达到89.2%，TN的去除率达到84.5%.在处理过程中，排泥中的磷量基本与进水中磷的量一致，未发现磷的其它去除路径.

Optimization and Stability of Denitrifying Phosphorus Removal in a Two-Sludge System for Treating Wastewater with Low Carbon Source

Poly-beta-hydroxybutyrate (PHB) could be efficiently accumulated under optimized conditions in a sequencing batch moving bed biological reactor (SBMBBR), and a high performance of denitrifying phosphorus removal in the reactor could be achieved by coupling with a two-sludge system. Denitrifying phosphorus removal achieved the highest efficiency under influent COD of 200 mg/L, neutral pH and stirring speed of 80 r/min. The removal rates of phosphorus, NO3(-)-N and NO2(-)-N reached 83.7%, 81.4% and above 100%, respectively. High biomass in the SBMBBR is one of keys to improve the performance in removal of nitrogen and phosphorus. When the SBMBBR was conducted under a two-sludge system, stable and high performance was obtained. Removal rates of phosphorus and TN reached 89.2% and 84.5% under the influent COD of 140-170 mg/L and TN of 34-42 mg/L, respectively. In the process, phosphorus content in excess sludge approached to that in the feeding, and other path of phosphorus removal was not found.