基于一维水质模型的盐津河纳污能力计算

盐津河是贵州省仁怀市主要供水水源和污染受纳水体。盐津河目前污染严重,水质超标,这在一定程度上给当地工、农业和居民生活用水安全带来严重隐患。以盐津河为计算对象,收集分析当地水文资料,并开展沿河污染源调查分析,确定了纳污能力计算的指标为COD、NH3-N和TP;依据水功能区特征,进行控制单元的划分,在此基础上对规划水平年(2030年)进行污染源预测;利用一维水质模型和纳污能力计算模型对各控制单元分别进行纳污能力计算。计算结果表明,现状年和规划水平年盐津河的纳污能力均为负值。根据盐津河污染现状,在规划水平年提出相应的水污染防治建议。建议实施后,COD削减量为722.3 t/a,NH3-N削减量为97.2 t/a,TP削减量为9.3 t/a,盐津河可达到其生态目标。本文可以为盐津河当地水环境治理提供参考和科学依据。

Calculation of Allowable Assimilative Capacity of Yanjin River Based on One Dimensional Water Quality Model

The Yanjin River is the main source of water supply and pollution receiving water in Renhuai City,Guizhou Province.At present,the pollution of the Yanjin River is serious,and the water quality is far from its target requirements,which,to a certain extent,brings hidden dangers to the safety of local industry,agriculture and residents.This paper takes the Yanjin River as the calculation object,collects and analyzes the local hydrological data,and conducts the investigation and analysis of the pollution sources along the river,and determines the indicators for calculating the allowable assimilative capacity as COD,NH3-N and TP.According to the characteristics of the water function area,the division of the control units are carried out,and on this basis,the pollution source prediction is carried out for the planning level year(2030).The allowable assimilative capacity of all control units are calculated by using the one dimensional water quality model and the allowable assimilative capacity model.The calculation results show that the values of allowable assimilative capacity of the Yanjin River are negative.According to the current situation of Yanjin River pollution,the corresponding water pollution prevention and control suggestions are proposed in the planning level year.After the implementation,the COD reduction is 722.3 t/a,the NH3-N reduction is 97.2 t/a,and the TP reduction is 9.3 t/a.The Yanjin River has reached its ecological goal.This paper can provide reference and scientific basis for the local water environment management.