Biological treatment is the core of most industrial ETPs where biodegradable organic load must be reduced before discharge, reuse or tertiary treatment. This guide compares ASP, SBR, MBBR, MBR and anaerobic systems, explains when each option is suitable, and shows how BOD, COD, toxicity, pH, salinity, flow variation, aeration, sludge settling and compliance targets affect ETP design and troubleshooting.
