摘要
研究东圳水库水质变化趋势,计算工程实施后的污染物削减量,为水质保护提供依据。利用SMS模型基于二维不可压缩流体运动方程,建立东圳水库水域二维水流水质数学模型,采用有限单元法,模拟预测东圳水库水环境状况,主要水质分析指标为高锰酸盐指数、氨氮、总氮和总磷。预测结果表明,按目前污染物排放状况,2018年东圳水库水体中污染物含量为氨氮0.14~0.21 mg/L(II类水质)、COD 3.3~3.9 mg/L(III类水质)、总磷0.052~0.062 mg/L(IV类水质),总氮1.1~1.6 mg/L(IV类水质)。实施社会经济调控、污染源防治和生态保育工程后,2018年,预计东圳水库高锰酸盐指数、氨氮、总氮和总磷共排放1 616.6、163.7、1 182.4和155.5 t/a,分别削减了1 501.8、439.9、756.4和105.2 t/a;总氮0.4~0.8 mg/L、总磷0.022~0.032 mg/L,降幅均达到50%以上,达III类水质标准;COD 2.0~3.0 mg/L、氨氮0.11~0.18 mg/L,达到II类水质标准。提出的实施方案对保护东圳水库的水质具有建设性意义,水体水质目标可达。
Dongzhen reservoir is one of the most important water resources in the Putian area and reservoir water quality is threatened by regional domestic sewage and agricultural non-point source pollution. Using monitoring data,a two-dimensional water quality model of Dongzhen reservoir was developed to simulate water quality and then predict water quality after implementation of environmental protection projects. Water quality parameters modeled include ammonia nitrogen,total nitrogen,total phosphorus and COD. Assuming the current pollutant discharges to Dongzhen reservoir did not change before implementing protection projects,the total discharge of ammonia nitrogen,total nitrogen,total phosphorus and COD were calculated for the planning year 2018. Without intervention,calculated concentrations of ammonia nitrogen,total nitrogen,total phosphorus and COD in Dongzhen reservoir would reach,respectively,0. 14-0. 21 mg/L,3. 3-3. 9 mg/L,0. 052-0. 062 mg/L and 1. 1-1. 6 mg/L. Water quality would decline to Grade Ⅳ and fail to meet water use requirements. Measures for improving water quality were then simulated,including social and economic regulations,engineering controls to reduce pollutant emissions,ecological conservation and environmental supervision and management. Simulation results indicate that the measures would improve water quality,with simulated discharges of COD,ammonia nitrogen,total nitrogen and total phosphorus to Dongzhen reservoir of 1 616. 6,163. 7,1 182. 4 and 155. 5 t/a,respectively. The predicted concentrations of total nitrogen and total phosphorus were 0. 4-0. 8 mg/L and 0. 022-0. 032 mg/L,a decline of 50%and water quality would meet the Grade III surface water quality standard. The predicted concentrations of COD and ammonia nitrogen were 2. 0-3. 0 mg/L,0. 11-0. 18 mg/L,meeting Grade II surface water quality standard. Implementation of these protection projects is critical for water quality improvement in Dongzhen reservoir and the project provides a model that can be used for environmental protectio
作者
巫丽俊
黄晓庆
孙华
WU Li-jun HUANG Xiao-qing SUN Hua(Nanjing Guohuan Technology co. , Ltd. Nanjing 210042, P. R. China Water Management Office of Shanghai Qingpubaihe, Shanghai 201709, P. R. China)
出处
《水生态学杂志》
CSCD
北大核心
2017年第5期14-20,共7页
Journal of Hydroecology
关键词
水质模拟预测
污染物控制
总氮
总磷
东圳水库
water quality simulation and prediction
pollution control
total nitrogen
total phosphorus
Dongzhen reservoir
