| In recent years,in the process of rapid urbanization in China,the pollution load generated by cities has greatly increased,but the construction of water pollution control facilities in most cities has lagging seriously.A large number of pollution loads have entered urban water bodies,resulting in the emergence of cities of all sizes in the country.It is urgent to govern the Black-odor River Water Body.This study takes the Dongpai Canal of Zhaoqing High-tech Zone in Guangdong Province as an example,combined with the analysis of the pollution status of the Dongpai Canal and the results of the problem diagnosis,targeted design of different combined treatment plans,and the use of numerical simulation methods to explore the water quality improvement of different plans Governance effect,provide data for the decision of the comprehensive treatment plan of the East Drainage Channel.Based on the monitoring data,this study analyzes the current status of water pollution in the East Drainage Channel.It can be concluded that:1)The existing pollution sources in the East Drainage Channel are mainly the tail water of the sewage plant,the direct sewage along the river,the rainfall runoff pollution and the sewage discharge from natural villages.The contribution rate of sewage pollution from rivers is the highest.2)The water quality of the drainage channel is heavily polluted throughout the year.According to the calculation of the pollution index,the main pollution factor is TP.3)At present,the main causes of pollution in the East Drainage Channel are insufficient treatment capacity of sewage plants,imperfect construction of sewage pipes,backward construction of sponge cities,lack of clean water sources and direct discharge of domestic sewage and breeding wastewater from natural villages.The MIKE11 model was used to construct a one-dimensional hydrodynamic water quality model of the target river.The simulation data and measured data of the model in the study area hydrodynamic water quality were compared and analyzed.The results showed that the correlation coefficient between the simulated water level and the measured water level at Dongwei Drainage Station was 0.878.The correlation coefficients of the simulated concentration and measured concentration of COD,NH3-N and TP at the city control section are 0.862,0.833 and 0.804,respectively.The simulation results are close to the measured data,and the errors are within a reasonable range,so it shows that the model can more accurately reflect the hydrodynamic water quality changes of the study channel.In response to the water pollution problem of the East Drainage Channel,combined with the objectives of controlling the cross section and the overall water quality improvement of the drainage channel,a corresponding treatment plan was formulated,and the water quality improvement effect of each plan was simulated.The results show that the combination of sewage interception,water replenishment,wetland standard sewage plant effluent and non-point source pollution control as a control section water quality improvement program can achieve the municipal control section water quality standards.In the simulation period,except for the TP concentration,which exceeded the V standard of surface water in a certain period,the compliance rate was 98.6%.The compliance rate of COD and NH3-N could reach 100%;20,000 m~3/d were constructed in the upstream and downstream And the 10,000m~3/d wetland as the overall water quality improvement plan of the drainage canal has good governance effects and economic benefits.The average concentration reduction rates of COD,NH3-N,and TP are 15%,33%,and 40%,respectively. |
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