Implementation of Novel Helix Tubular Ultrafiltration Membrane in Treating Landfill Leachate
The external ultrafiltration membrane bioreactor(MBR)process is widely used in landfill leachate treatment.However,the traditional tubular ultrafiltration membrane is faced with a greater risk of membrane pollution and membrane plugging in facing of complex working conditions such as high sludge concentration and many pollutants.The new helix tube ultrafiltration membrane module has a unique membrane surface structure.In order to verify its anti-fouling performance,a long-term performance test is carried out in a domestic landfill leachate treatment station.Through the changes of permeate,circulating flow and effluent quality of the MBR membrane system,the treatment effect and membrane fouling characteristics of the new helix tube ultrafiltration membrane module and the traditional tube membrane module are compared and analyzed.The results show that the average attenuation of flux of MBR membrane system is 5.25％in the first two years of operation,3.1％in the third to fifth years of operation,and the flux of new helix tube membrane module remains 126.7 L/(m2·h)in the fifth year;the average value of the initial circulation flow of the membrane system is 274.1 m3/h(i.e.circulate velocity is 4 m/s).The mass concentration of ammonia nitrogen in effluent is lower than 10 mg/L for a long time,and the CODCr removal rate reaches 90％.The new helix tubular membrane module has better anti-pollution performance and can operate continuously for 57 days without chemical cleaning.A more balanced trans-membrane pressure(TMP)design ensures the operation stability of the MBR membrane system.The study shows that difference between thenew helix structure tubular ultrafiltration membrane module and the traditional structure tubular ultrafiltration membrane module lies in the change of the microenvironment flow pattern on the membrane surface,which has a stronger disturbance ability and reduce the risk of fouling and plugging of the membrane tube.
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