Calculation of water environmental capacity and pollutant sharing rate with water diversion: a case study of Qinhuai River

Abstract

With an overall consideration of hydrology, water quality and pollution sources, and the pollution source area, which affect the water quality, the Qinhuai River basin has been simplified as a control unit. Based on the establishment of the control unit water environmental model, the most unfavorable hydrological condition has been set up. The model comprehensively considers the effects of boundary water quality and the response relationship between the water quality of a cross-section and the general population. The allowable discharge of each generalization outfall can be calculated by the response relationship, and the chemical oxygen demand (COD), NH3-N, and total phosphorus (TP) water environment capacity of the control unit can be obtained. As shown in the results: in the near future (2017–2019) with 35% sewage interception and 30 m3/s water diversion; in the long term (after 2020) with 82% sewage interception, the water quality can reach the standard. Combined with the measured calculation, the paper also has made a quantitative analysis of the sharing rate of the main tributary and sewage pump station pollutant flux in the control unit and the whole basin within the administrative district.

Simulation of the Parameters Effecting the Water Quality Evolution of Xuanwu Lake, China

“…To study the relationship between water quality and the influencing factors of Xuanwu Lake, we set different schemes for the amount of pollutants (W), degradation coefficient (K), water diversion (Q) and diffusion coefficient (D). Based on the current amount of pollutants and reduction plan, 11 schemes were set up to calculate the amount of pollutants after reduction [ 7 , 44 ], and the relationship between the amount of pollutants and the water quality of Xuanwu Lake was studied ( Table S1 ). Based on the current range of degradation coefficients, 27 schemes were set up to calculate the water quality under different degradation coefficients [ 45 ], and the relationship between water pollutants concentration and degradation coefficients of Xuanwu Lake was shown in Table S2 .…”

“…By constructing the urban sewage pipe network, sewage enters the plant for treatment, thereby reducing direct discharge into river [ 5 , 6 ]. Construction of a new sewage pipe network is in conflict with the old urban infrastructure, and will also take many years to complete [ 7 , 8 ]. In addition, there are certain problems in the operation and management of the sewage pipe network, which makes it impossible to use reasonably, making it useless [ 9 , 10 ].…”

Study on the proportion and flow path of Yangtze River water diversion into Taihu Lake

“…With intensive human activities, the uneven distribution of water resources and pollution-induced water shortages make regional water diversion more frequent, and the impact of water diversion projects on lake hydrodynamics, water quality, and water ecology has gradually become a hot issue. (Zhang et al 2016;Song et al 2019aSong et al , 2019bZhang 2019;Dai et al 2020b;Xu et al 2020c).…”

Water Environmental Capacity Calculation Based on Control of Contamination Zone for Water Environment Functional Zones in Jiangsu Section of Yangtze River, China

“…The calculation of WEC is beneficial to resolve contradictions among administrative regions [26]. A MIKE 11 model was established to study the WEC of Qinhuai River, the main tributary of the Yangtze River [27]. Also, a WEC calculation framework based on MIKE 11 for the regional water environment functional zones was built in a plain river network area [28].…”