硫磺/石灰石自养反硝化系统脱氮除磷性能研究

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...

Performance of Nitrogen and Phosphorus Removal of Sulfur/Limestone Autotrophic Denitrification System

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 NO3(-) -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 degrees C, and the efficiency of phosphorus removal rate reached about 50%, when the temperature was between 25-30 degrees C. 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%.