(a) Explain the advantages of a membrane bioreactor (MBR) system in advanced wastewater treatment. If a typical activated sludge treatment works is retrofitted to incorporate an MBR process, explain how wastewater and sludge treatment lines in the treatment works need to be modified.
(a) Explain the advantages of a membrane bioreactor (MBR) system in advanced wastewater treatment. If a typical activated sludge treatment works is retrofitted to incorporate an MBR process, explain how wastewater and sludge treatment lines in the treatment works need to be modified.
(b) Calculate how much additional aeration unit volume is required to upgrade a BOD removal activated sludge plant under the following conditions:
I. Good nitrification performance by increase in Solids Retention Time (SRT).
II. 80 % increase in SRT (Solids Retention Time) is achieved by 40 % reduction in sludge waste flow rate.
III. Mixed Liquor Suspended Solids (MLSS) concentration in aeration unit and settled solids concentration is unchanged.
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