Study On Quality Improvement And Transformation Technology Of Hebei Fudong Sewage Treatment Plant And Analysis Of Operation Effect

Water environment pollution leads to the continuous reduction or even extinction of organisms,resulting in the reduction of the utility of various types of natural environmental resources,and seriously damaging the balance of the ecological environment.At the present stage,the situation of water pollution prevention and control is still serious,and the environmental problems of imbalance and incoordination of water ecological environment protection are urgent to be solved.The severe damage of water ecological environment and the drying of rivers and lakes are widespread.There are many shortcomings in the construction of urban and rural ecological environment infrastructure.The prevention and control of non-point source pollution in urban and rural areas is a daunting task,and pollution from non-point sources in aquaculture and agriculture around some key lakes and reservoirs is a serious problem,which needs to be solved at a faster pace.The Action Plan for Water Pollution Prevention and Control issued by The State Council in April2015 explicitly calls for strengthening the comprehensive treatment of urban domestic sewage.The Notice on Accelerating the Upgrading of Sewage Treatment Facilities（Hengshui Requisition Letter No.7（2019））issued by Hengshui Water Requisition Office is required.By the end of 2020,sewage treatment plants will fully implement the discharge standards of key control areas in the local standards of Ziya River Basin Water Pollutants Discharge Standards（DB13/2796-2018）and Heilonggang and Yundong River Basin Water Pollutants Discharge Standards（DB13/2797-2018）of Hebei Province.This study is based on the quality improvement project of Hebei Furong Sewage treatment Plant.Based on the investigation and analysis of the operation status and the data of water quality in and out of furong sewage treatment plant,combined with the existing treatment technology,the study and analysis of the quality improvement technology of Furong sewage treatment plant.The main contents of the study include:effect and problems of original technology in FURong Sewage treatment plant,analysis and determination of water quality in and out of furong sewage treatment plant,selection and analysis of process scheme for upgrading,optimization of design parameters and process design,operation efficiency analysis,etc.Based on the experimental data of FUMing East Sewage Treatment Plant in2020,the design size of fuming East sewage treatment plant is determined to be15000m³/d.The design water quality of FURon sewage treatment plant is CODcr=500mg/L,BOD₅=200mg/L,SS=400mg/L,NH3-N=35mg/L,TN=55mg/L,TP=4mg/L.The designed effluent water quality shall comply with the discharge standards of key control areas in the local standards of Hebei Province,Ziya River Basin Water Pollutant Discharge Standard（DB13/2796-2018）and Heilonggang and Yundong River Basin Water Pollutant Discharge Standard（DB13/2797-2018）,namely CODcr≤40mg/L,BOD₅≤10mg/L,Ammonia nitrogen≤2mg/L,total phosphorus≤0.4mg/L,total nitrogen≤15mg/L,p H=6-9.The quality improvement project is improved on the basis of the existing sewage treatment process,without increasing the amount of sewage treatment,and without changing the quality of sewage treatment.Therefore,after the completion of the renovation project,the sewage discharge is 15000m³/d,and the main pollutants are CODcr,BOD₅,SS,NH₃-N and TP.According to the discharge standard of Water Pollutants in Ziya River Basin（DB13/2796-2018）,the emissions of CODcr,BOD₅,SS,HN3-N and TP were 0.6t/d,0.15t/d,0.15t/d,0.03t/d and 0.006t/d,respectively.Under the condition of 50%medium water reuse rate,the annual sewage discharge is2,737,500 m³/a,and the annual discharge of CODcr,BOD₅,SS,NH₃-N and TP are109.5t,27.4t,27.4t,5.5t and 1.1t,respectively.The main research contents are as follows:1.The current situation and actual operation of the original Fudong Sewage Treatment Plant,that is,the research and analysis of the influent scale and influent quality of the original sewage treatment plant;2.Research on the process plan for upgrading the quality of the sewage treatment plant,that is,the determination of the design scale,the determination of the quality of the designed influent and effluent,the selection of the process plan for the upgrading and renovation of sewage,and the determination of the overall process flow.3.Sewage treatment plant debugging and operation efficiency analysis,namely operation efficiency analysis,CODcr removal effect analysis,BOD₅removal effect analysis,SS removal effect analysis,TN removal effect analysis,NH3-N removal effect analysis,and TP removal effect analysis.The implementation of furong Sewage treatment plant upgrade project has achieved the fuyang River’s quality and efficiency improvement,the treatment effect is stable and reliable,without increasing the amount of wastewater treatment,the effluent CODcr,HN3-N and TP discharge indexes have been improved,which meets the design requirements and is conducive to improving fuyang River’s environmental capacity and water quality.It plays a positive role in improving the ecological environment quality of the river basin.