Biosolids reuse Biosolids, also referred to as sludge, are solids from wastewater treatment that have been processed into products suitable for beneficial uses such as agriculture, forestry, land rehabilitation and composting projects. Over 60 per cent of solid material discharged into Sydney's sewerage system is now being captured at the sewage treatment plants. Ocean disposal and incineration of biosolids is increasingly a thing of the past. Storage Dam Sydney Water uses a large and complex network of dams to provide a reliable source of drinking water for the regions of Sydney, Illawarra and Blue Mountains. The Sydney Catchment authority is a staturory body set up by the NSW government to manage and protect Sydneys Water supply catchments, dams and associated infrastructure.
Water drains from the catchment areas and feeds into the storage dam, mostly by streams or rivers.
The water is then stored in the dam until it is needed, this can be months or even years. It is then transferred by water pumping stations to a water filtration plant, then to below and above ground reservoirs to supply the community with water.