Study On Biological Pretreatment And Ultrafiltration For Micro Polluted Source Water

Due to the shortage of water supply and the poor water quality of the drinking water in rural areas of China,and the deterioration of the water environment,the water quality of the source water is further polluted,and after the implementation of the new drinking water standard,the requirements for water quality are further The improvement has made the rural drinking water more difficult.The traditional water treatment technology can not meet the current rural demand for water quality.Therefore,the development of ultrafiltration technology in rural areas is suitable for the current rural development situation,and can play Application characteristics of ultrafiltration technology.The use of non-pretreatment ultrafiltration water purification process can maximize its characteristics and is more suitable for the specific situation in rural areas.The paper mainly uses no pretreatment.Two kinds of ultrafiltration membranes are used to treat the water in a reservoir in Chongqing,and the effect analysis and stability analysis are carried out to provide valuable experience for the promotion of ultrafiltration membrane technology.The water quality of the raw water and ultrafiltration membranes of the two ultrafiltration membrane system devices（internal pressure ultrafiltration membrane and external pressure ultrafiltration membrane）were compared,and the COD_Mn,turbidity,UV₂₅₄ and p H were mainly analyzed.Through experimental analysis,the water production of the two ultrafiltration membrane system devices can be lower than the newly released limit value of the country.The two ultrafiltration membrane water purification system devices have a relatively high removal rate of turbidity in the raw water,and have little effect on the p H value.The p H values of the two ultrafiltration membranes meet the standard requirements.The COD_Mn values of the two types of ultrafiltration system devices also meet the new published limits,and from the average removal rate of COD_Mn,the filtration effect of the internal pressure type ultrafiltration membrane system on COD_Mn is slightly due to external pressure ultrafiltration.The filtration effect of the membrane system device.The effect of the two ultrafiltration membrane system devices on the treatment of UV₂₅₄ in raw water has a great change.The highest filtration time is 78.26%,and the lowest filtration time is 3.12%,but the produced water can meet the requirements,while the ultrafiltration membrane system is at the same time.The difference between the devices is small.The stability study of two ultrafiltration membrane system devices found that both ultrafiltration membrane system devices can operate efficiently and stably for a long time.The analysis found that the internal pressure type ultrafiltration membrane is more suitable for medium and large drinking water plants than the external pressure type ultrafiltration membrane and is an uninterrupted water supply method.The external pressure ultrafiltration membrane is more suitable for places with poor water quality.Through the analysis of the operation data of a water plant in Chongqing,the relationship between the transmembrane pressure difference and the flow rate is plotted.It is found that when the flow rate is higher than the actual design flow rate of the ultrafiltration membrane,the TMP will increase rapidly,and the analysis confirms that it is an ultrafiltration membrane.Membrane fouling occurred within a few minutes.When plotting the relationship between TMP and flow and source water,it is found that the flow is the cause of the rapid growth of TMP.Therefore,further study of the operational parameters affects the formation of membrane fouling.Finally,the imported VAR model also directly indicates that the operation of the ultrafiltration membrane is very High stability.In order to meet the long-term and stable operation of ultrafiltration membranes,the emergency treatment test for water quality conditions such as high turbidity and high COD_Mn has been added,and the ultra-filtration membrane has been found by the flocculation-ultrafiltration test to treat the high turbidity and other water quality conditions during the flood season.It has good removal effect on turbidity,COD_Mn,UV₂₅₄,etc.,and the effluent water quality meets drinking water standards.