This engineering manual outlines verified diagnostic workflows, mathematical calculations, and safety clearances for Sewage Treatment Plant (STP) MBBR & MBR Process Troubleshooting: MLSS, DO & COD Reduction. Adheres to national and international building standards including CPCB Guidelines / IS 2490 / USEPA STP Manual.
Table of Contents
1. Biological Aeration Kinetics & Dissolved Oxygen Control
In Moving Bed Biofilm Reactor (MBBR) and Membrane Bioreactor (MBR) plants, aerobic bacteria require a constant Dissolved Oxygen (DO) concentration between 2.0 and 2.5 mg/L.
Air Demand (m³/hr) = ( Total Daily BOD5 Mass (kg/d) * 1.5 kg O2/kg BOD ) / ( O2_air_fraction * SOTR * 24 )2. MBR Membrane Clean-In-Place (CIP) Regimen
- Maintenance Wash (Weekly): Backpulse with 300–500 ppm Sodium Hypochlorite (NaOCl) for 30 minutes to dissolve organic biofouling.
- Recovery Cleaning (Bi-annual): Soak in 2.0% Citric Acid solution to dissolve mineral scaling and iron precipitates.
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