effects of high ph (>10) on sanitary sewer piping and WWTP processes
effects of high ph (>10) on sanitary sewer piping and WWTP processes
(OP)
I am interested in hearing about any experience or knowledge that anyone has with the effects of wastewater with a pH >10 on sanitary sewer collection system piping and waste water treatment plant processes. Additionally, is concrete piping used for most sanitary sewer collection systems?
Any information will be greatly appreciated. Thanks!
Any information will be greatly appreciated. Thanks!





RE: effects of high ph (>10) on sanitary sewer piping and WWTP processes
Concrete pipes are rarely used in Australia for other than very large diameter sewer mains. Traditionally cement lined ductile iron hjas been used. More modern systems are using solvent welded ABS (www.eurapipe.com.au) or butt fusion welded PE. These systems over come the problem of ingress of water through the rubber ring joint. In time the RRJ loses the inherent resilience and this allows the roots to penetrate.
Other materials used are FRP or GRP for large mains. However some FRP materilas have low strain tolerance and thus require more care in embedment techniques or wider trenches. There is still some concrete pipe used however this requires plastic lining where hydrogen sulphide exists and causes corrosion. Concrete pipe is only available in short lengths compared to the more modern thermoplastics. Hence trenches are generally kept open for longer.
RE: effects of high ph (>10) on sanitary sewer piping and WWTP processes
As far as sanitary sewer piping, I see PVC as the predominant material for small (less than 24” diameter) gravity sanitary sewers. PVC is resistant to corrosion and is available in enough classes to handle most loads.
RE: effects of high ph (>10) on sanitary sewer piping and WWTP processes
Hope this helped.