Investigation And Evaluation Of Water Environment Quality Of Main Rivers In Dezhou City

In this paper,the four rivers flowing through Dezhou in the Haihe River Basin are selected as the research objects.The pH,COD_Mn,COD_Gr,TN,TP,NH₃-N and fluoride were selected as monitoring evaluation factors.The single factor evaluation method was used to analyze the water quality of the four rivers in 2017.Through the analysis of online monitoring data of four rivers in 2017,it is found that the pollution characteristics of the four rivers are significantly different.The main pollutants of the Zhangweixin River are chemical oxygen demand,total nitrogen,total phosphorus and fluoride.The main pollutant of Majia River is total nitrogen.The main pollutants of Dehuixin River are total nitrogen and fluoride.The main pollutants of Tuhai River are chemical oxygen demand,total nitrogen and fluoride.The water quality analysis was carried out for monitoring sections of the four rivers.It was found that the water quality of the Tianlongzhuang monitoring sectionsin in the five monitoring sections of the Zhangweixin River were more serious.The monitoring indicators of the Daxuqiao monitoring section were up to standard stably;In the three monitoring sections of the Majia River,the water quality of Dongguqiao exceeded the standard in April.The monitoring indicators of the Nanduqiao monitoring section were up to standard stably.In the four monitoring sections of Dehuixin River,the fluoride of the Jiandianqiao exceed the Class V water body standard,while the water quality of the monitoring section of Jiwangqiao were up to standard stably.The water quality of Tiankouqiao of Tuhai River is better than that of the Qianyoufang monitoring section.The total nitrogen,total phosphorus and fluoride in the four main rivers in Dezhou exceed the Class V water body standard of Surface Water Environmental Quality Standard,which is the main pollutant of the river in the region,and the permanganate index,chemical oxygen demand,ammonia nitrogen and pH can be stabilized to the Class V water body standard of Surface Water Environmental Quality Standard.Dehuixin River in Dezhou has the best water quality,followed by Majia River and Tuhai River,and the Zhangweixin River has the worst water quality.The variation trend of water quality time of four rivers in Dezhou shows that the phenomenon of pollutants exceeding the standard is mainly concentrated in the flat water period and the dry season,that is,the water environment in Dezhou City is relatively good in the wet season.