星海湖水环境容量研究

基于2015—2017年星海湖高锰酸盐指数(I Mn)、化学需氧量(COD)、五日生化需氧量(BOD 5)、氨氮(NH 3 N)、总氮(TN)、总磷(TP)监测数据,以水质状态不再恶化、达到Ⅳ类水质、达到Ⅲ类水质、达到Ⅱ类水质为目标,采用完全混合模型评估星海湖水环境容量。结果表明:星海湖I Mn水环境容量保持稳定,4种控制目标下3年水环境容量均值分别为882.90 t/a、2366.76 t/a、-195.29 t/a、-1476.31 t/a;COD环境容量逐年减少;BOD 5环境容量存在一定波动,2016年环境容量明显增加;NH 3 N负荷接近Ⅱ类水质目标下环境容量;TP、TN的环境容量稀缺,急须对入湖TP、TN作削减。

Water Environmental Capacity Assessment of Xinghai Lake

The water environmental capacity of Xinghai Lake was assessed by full mixed model based on the monitoring data of permanganate Index(I Mn),chemical oxygen demand(COD),five-day biochemical oxygen demand(BOD 5),ammonia nitrogen(NH 3 N),total nitrogen(TN),total phosphorus(TP)from 2015 to 2017,for preventing water quality from deteriorating,and reaching water quality standardⅣ,ⅢorⅡgrade.The results showed that the water environmental capacity for I Mn was stable,the mean environment capacities under 4 control targets in the three years were 882.90 t/a,2366.76 t/a,-195.29 t/a and-1476.31 t/a,respectively.The environmental capacity for COD decreased year by year.The environment capacity for BOD 5 fluctuated,and increased significantly in 2016.The load of NH 3 N in water was close to the environmental capacity under water quality standardⅡgrade target.The environmental capacity for TP and TN were insufficient,revealing the urgence of TP,TN reduction.