Sludge & Septage
Conventional sewage treatment plants based on the activated sludge process produce tonnes of waste sludge (“surplus sludge” or “waste activated sludge”) every day which needs to be dewatered, stabilised and disposed of. Traditional mechanical-chemical approaches to waste activated sludge dewatering (e.g. belt press, filter press, screw press, centrifuge) tend to be energy and chemical intensive while doing little to biologically stabilise the biosolids.
Sludge Treatment Wetlands (STWs; a.k.a: Sludge Treatment Reed Beds or Sludge Drying Reed Beds) are a specially adapted wetland design for the purpose of dewatering, mineralising, storing and stabilising sludge without the need for electricity, chemicals or mechanical processes.
STWs have been successfully used for more than 30 years in Europe, with several systems in Denmark serving municipal STPs of >100,000 PE capacity. In Australasia, with our warmer climate, STWs have the potential to revolutionise the way sewage sludge is managed; converting it into a high class biosolid with the power of nature (no inputs of electricity, chemicals or mechanical equipment) whilst simultaneously treating the liquid component.
WET Systems also have extensive experience in development of constructed wetlands for treatment of septage (the slurry pumped out of septic tanks and holding tanks) and raw sewage under a broad range of situations and conditions, including remote settlements and low-income communities.
OUR SLUDGE & SEPTAGE SERVICES INCLUDE: