温度对A^2O工艺脱氮速率及胞外聚合物影响

Effect of temperature on denitrification rate and extracellular polymeric substances using A^2O process

为了提高脱氮效率,采用连续流A2O工艺对模拟生活污水进行了长期连续实验,考察了不同温度下进水有机负荷对A2O工艺脱氮速率与胞外聚合物EPS的影响。结果表明:当温度为(10±2)℃,进水有机负荷COD(以MLSS计)为0.15 g/(g·d)时,TN去除速率(以MLVSS计)为1.58 mg/(g·h),COD去除速率为19.3 mg/(g·h),EPS质量浓度为492 mg/L;当温度为(17±2)℃,进水有机负荷为0.15 g/(g·d)时,TN去除速率为1.82 mg/(g·h),COD去除速率为22.5 mg/(g·h),EPS为456.6 mg/L;当温度为(22±2)℃,进水有机负荷为0.15 g/(g·d)时,TN去除速率为2.02 mg/(g·h),COD去除速率为23.5 mg/(g·h),EPS为397.2 mg/L;当温度为(30±2)℃,进水有机负荷为0.15 g/(g·d)时,TN去除速率为2.22 mg/(g·h),COD去除速率为25.5 mg/(g·h),EPS为413.5 mg/L。随着温度的升高,TN与COD去除速率逐渐上升,EPS质量浓度先降低后升高。

A long-term continuous experiment was carried out using A2 O process in order to improve the biological denitrification efficiency of simulated wastewater.The effect of influent organic loading on the denitrification rate and extracellular polymeric substances （EPS）was investigated at different temperatures.The results show that when the influent organic loading COD （as MLSS）is 0.15 g/（g·d）at（10 ±2）℃,the removal rates of total nitrogen and COD （as MLVSS）are 1.58 mg/（g·h）and 19.3 mg/（g·h）,respectively,and EPS mass concentration is 492 mg/L;when the influent loading COD is 0.15 g/（g·d）at （17 ±2）℃,the removal rates of total nitrogen and COD are 1.82 mg/（g·h）and 22.5 mg/（g·h）,respectively,and EPS mass concentration is 456.6 mg/L;when the influent loading COD is 0.15 g/（g·d）at （22 ±2）℃,the removal rates of total nitrogen and COD are 2.02 mg/（g·h）and 23.5 mg/（g·h）,respectively,and EPS mass concentration is 397.2 mg/L;when the influent loading COD is 0.15 g /（g·d）at （30 ±2）℃,the removal rates of total nitrogen and COD are 2.22 mg/（g·h）and 25.5 mg/（g·h）,respectively,and EPS mass concentration is 413.5 mg/L.With the increase of temperature,the removal rate of total nitrogen and COD is raised gradually,and the mass concentration of EPS is decreased initially and then raised.