Analysis Of Mbr Process Engineering Reconstruction When Treat River Water

In response to the dual pressures of water shortages and pollution,Beijing has implemented a series of water resources protection and utilization projects,during the past 20 years,including the first phase of the Wenyu River Water Resources Utilization Project in Shunyi New City(also known as the"Phase ? Project").The Project was established in 2007,the main indicators of the treated water reach the surface class III standard(except TN<15 mg·L-1)by the dosing flocculation+membrane biological(MBR)technology.Then the water was pumped to the river.The annual diversion flow is 38 million m3.The project improve the water environment around the Olympic venues and Shunyi New Town.After many years of operation,the effluent water volume of the project decreases with the decrease of membrane flux,the effluent TP index occasionally fails to meet the standard,and the NH3-N has exceeded the standard in the winter.The system needs more and more drug consumption and aeration amount to maintenance.In order to ensure the continuous and stable operation of the project,the water quality has been stable for a long time,and the ecological and environmental benefits of the project have been continuously exerted.It is urgent to transform the project.This paper firstly introduces the background and significance of the implementation of the renovation project,as well as comprehensive analysis of the micro-polluted river water treatment process and water diversion project cases at home and abroad.Through the analysis of the current status and problems of the "Phase ? Project",the engineering transformation plan was determined:The technical route,main content and plan of the transformation is maintain the original MBR main process design plan,config a new membrane system and supporting facilities,transform the original inclined tube sedimentation tank into a flat flow sedimentation tank,optimize the sludge treatment process,and transform the entire plant automation system.The project was renovated in 2017 and put into trial operation in April 2018.This paper focuses on tracking the operation status of the renovation project and analyzing the operation effect of the system after the transformation,the average effluent concentrations of COD,ammonia nitrogen,TN and TP during the period from April 2018 to January 2019 were 17.3,0.18,9.9,and 0.11 mg·L-1,respectively.The effluent quality of the system has been significantly improved compared with that before the transformation,and the concentration of ammonia nitrogen in effluent decreases most significantly.Especially at low water temperature,the concentration of ammonia nitrogen in effluent decreases significantly when compared with that in effluent which is about 1-7 mg/L before revamping.The mean TMP under flux of 20 LMH and 10 LMH was about 15 kPa and 12 kPa,which can meet the water production requirements.When the river is full of water in summer,the system can treat 100,000 tons per day,After the transformation,the electricity consumption per ton of water dropped from 0.7 kwh to 0.5 kwh,and the consumption of water per ton decreased by more than 20%.The focus of this paper is on the demonstration of the engineering transformation plan and the effect of tracking and evaluation.This renovation project has a certain reference role in the treatment of micro-polluted water in other rivers.