Building a new MBR, what questions do you ask other operators?
asked 11 July 2017 asked by dmcdermid (480 points)
Backwash procedure and frequency? Lifetime of their modules, types of modules their use. Energy consumption. Total solids content in the bioreactor.
I would add to what Tamara asked the following points: -what causes most problems -what are the maintenance costs -what requires the most maintenance -what are your operational parameters -what problems have you encountered so far? -How is a typical day of operation with MBR, what is it that takes you the most time
Ask to see verifiable operations and maintenance costs from a similar facility that has been in operation for 5 years or longer. During my 30 years managing and consulting on wastewater treatment facilities of all types, I have seen O&M cost underestimated by very large percentages. The preferences of the designing engineer for the technology of choice seems to have the greatest impact on projected O&M costs and of course don't rely on information furnished by the manufacturers salesperson.
Hi Dmcdermid, Why you are upgrading activated sludge treatment plant ? are you expecting that with MBR installation, treatment capacity of your current plant will increase by using same infrastructure ? Following questing need to be ask during your tour to any MBR treatment plants; 1. Current Trans membrane Pressure (TMP) and compare this with the TMP value during commissioning stages. 2. Frequency of Chemical Cleaning and Back washing. 3. Working life of MBR membrane, when they have done replacement of any membrane module ? 4. Inlet Screening mechanism at head works ( should be minimum 250 micron for trouble free operation of MBR ) 5. Effectiveness of Chemical cleaning and back washing of membrane, after performing chemical cleaning and back washing TMP is returning down or remain same ? 6. Ask them power consumption in kw per m3 of inlet flow and compare with your existing Activated sludge treatment power consumption record. 7. How much sustainable is MBR system with respect to activated sludge treatment plant 8. Is sludge production per day with MBR system is less as compare to activated sludge treatment plant 9. How much MLSS concentration they are maintaining in Aeration tank 10. Ask them for final Effluent Test Analysis Report and review it with the Design values. Regards, KS
One of the most important things to think about for successful and efficient operation of an MBR is screenings. Depending on plant size, there are a few good options. Personally, I prefer the static screens. No moving parts and much more effective than an auger. Screenings seems to be an after thought and I have seen insufficient barscreens destroy a relatively new MBR