中文摘要：

为了考察硫磺/石灰石系统对于低C/N的城市污水进行同步脱氮除磷的性能,设计了体积比为1∶1的硫磺/石灰石柱式反应器,以人工配水为处理对象,采用厌氧生物滤池运行方式,研究了HRT、初始磷浓度、pH、温度等因素对其脱氮除磷性能的影响.结果表明,在进水NO 3^--N为30 mg/L左右,PO4^3--P为15 mg/L条件下,系统最优水力停留时间为6 h,TN和磷的去除率分别为100%和44.46%.初始磷浓度和初始pH值对系统的脱氮除磷性能有较大影响,要保持TN去除率90%以上,初始磷浓度不宜低于0.4 mg/L;系统最优初始pH值为6.5,TN和磷的去除率分别为91.51%和47.68%.系统脱氮除磷的性能随着温度的降低而降低,温度在18～30℃的范围内,NO 3^--N的去除速率能够达到95%以上;在25～30℃时,磷去除率能达到50%左右.硫磺/石灰石系统中的除磷行为与反硝化过程有密切关系,磷的去除主要以化学沉淀为主;该系统对于低C/N的城市污水具有一定的同步脱氮除磷性能,磷的去除率最高可达50%左右.

英文摘要：

In order to investigate the performance of nitrogen and phosphorus removal of the sulfur/limestone system from low C/N municipal sewage,a sulfur/limestone packed column reactor fed with synthetic wastewater,and operated in the way of anaerobic biological filter was constructed.The effects of HRT,initial concentration of phosphate,pH and temperature on nitrogen and phosphorus removal were studied.The results showed that with influent of NO-3-N 30 mg/L,PO4^3--P 15 mg/L,the optimal HRT value was 6 h,and removal rates of TN and phosphorus were 100% and 44.64% respectively.Initial concentration of phosphate and initial pH had a significant influence on nitrogen and phosphorus removal.In order to keep nitrogen removal rate higher than 90%,initial concentration of phosphate should not be below 0.4 mg/L;the optimal pH value was 6.5,and removal rates of TN and phosphorus were 91.51% and 47.68% respectively.Temperature had a positive impact on that system,the nitrogen and phosphorus removal rate decreased with decreasing temperature.The nitrate removal efficiency was high in the temperature range of 18-30℃,and the efficiency of phosphorus removal rate reached about 50%,when the temperature was between 25-30℃.The dephosphorization behavior of sulfur/limestone system correlated closely with autotrophic denitrification process,and the mechanism of phosphate removal of the SLAD system was mainly due to chemical precipitation.The system had the performance of nitrogen and phosphorus removal from low C/N municipal sewage,the highest phosphorus removal rate could reach 50%.