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MBR start up (Read 196 times)

paparesta

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MBR start up
May 04^th, 2012, 6:53am

hi guys,

I have a problem with a start up with a MBR plant.The SRT is 28.5 days and the aeration section(aerobic)is 54 m3 days.The whole system with the membranes is 85 m3/day.I have a equalization basin of 50 m3/day and a pre-sedimentation basin of 5 m3 day.The incoming water BOD5 is 220 mg/liter.I started the plant with 20 m3/day the incoming raw water is 75 m3/day(55 m3 bypassed) so i can build up the MLSS to 10 gr/lit.I\At first there was a result but now the bacteria growth stooped at around Sv 100 ml(MLSS around 1gr)if i increase the flux the flat sheet membrane flux is going down due to not having the necessary bacteria amount in the system.I need some ideas about what can i do for reaching this value of MLSS.The aeration now is 50 minutes on 10 minutes of but im thinking of turning on all the time.
Thank you

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grrun

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Re: MBR start up
Reply #1 - May 4^th, 2012, 11:19am

MLSSs are not a monoculture and consequently the population distribution of the micro organisms varies with sludge age. You need to increase the food supply to grow more sludge (MLSSs). Since the MBR is basically an activated sludge system, you will still have to waste some sludge to make room for new growth and I would increase the flow into the MBR to increase the MLSSs. Membrane plugging may be a function of agitation (usually by coarse air agitation) by the membranes. Slowly increase the feed to the system until it reaches the design rate. More importantly, aim for a sludge age rather than a MLSS goal. Your SV₃₀ probably indicates that the system is working properly.

grrun

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paparesta YaBB Newbies Offline I love Water and Wastewater.com Posts: 12 Skopje Gender: Company or Organization: INKOHEM	Re: MBR start up Reply #2 - May 4^th, 2012, 2:02pm Thank you Mr.Grunn, I will increase the flow to the MBR to design capacity.I will have to clean the membranes more often and waste sludge.Hope this works.
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