It can be piping leaks or if a membrane has collapsed, sludge can enter the piping from the damaged diffuser during non aeration phase. If it is the case, it is very easy to confirm it visually. During normal operation you can also verufy it if you have drainage valves => you open it frequently to remove condensates anf if sludge is resent in piping, ypu will observe brown water coming out from the piping drainage system.
Published by Michael Martin, Deputy Asset & Technical DIrector at SUEZ International
It can be piping leaks or if a membrane has collapsed, sludge can enter the piping from the damaged diffuser during non aeration phase. If it is the case, it is very easy to confirm it visually. During normal operation you can also verufy it if you have drainage valves => you open it frequently to remove condensates anf if sludge is resent in piping, ypu will observe brown water coming out from the piping drainage system.