桂林桃花江水环境容量研究

对桃花江水环境容量进行了初步研究,系统调查了桃花江沿岸主要排污口,分析了其污染特征.根据其水文水质特点,选择一维推流模型,在枯水期现场取样,采用室内振荡实验,确定了水质模型中的综合衰减系数为:KCODMn=0.30 d-1,KNH3-N=0.35 d-1.据此计算出各控制单元的水环境容量及不同规划水平年污染物排放量和削减量:伍仙桥至飞鸾桥河段的CODMn、NH3-N理论削减量,2010年分别为879和470.8 kg/d,2015年分别为901和477.8 kg/d,将远远超过相应河段的水环境容量.北冲污水处理厂排放的“尾水”将是水污染治理的重点,也是改善桃花江水环境质量的关键.

Water environment capacity of Taohuajiang River in Guilin

Water environment capacity of Taohuajiang River is studied.The characteristics of main pollutants are systemically analyzed after investigating the current state of the Taohuajiang watershed.Based on the hydrological conditions and water quality,one-dimension water quality model is established.Sampling is taken from low water period and sent to the laboratory to collect the attenuation coefficient by vibration test.In the water quality model,the attenuation coefficients of colligation are determined to be K_(COD_(Mn))=0.3 d~(-1),K_(NH_3-N)=0.35 d~(-1).The water environment capacity of each section and the reduce capacity of sewage in different years are calculated.The results show that the theoretical reduction of COD_(Mn) and NH_(3)-N from Wuxian bridge to Feiluan bridge section of Taohuajiang river in 2010 and 2015 will be larger than the water environment capacity,which are 879 kg/d and 470.8 kg/d in 2010,901 kg/d and 477.8 kg/d in 2015.In the near future,the effluent of the Beichong Wastewater Treatment Plant will be the main contributor to water pollution of Taohuajiang River,and the serious factor polluting the environment quality of Taohuajiang River.