Suspended solids Particles in water that can be removed by sedimentation or filtration. Trade Waste Agreements Agreements reached between Sydney Water and industrial and commercial customers to restrict the amount of toxic and other potentially harmful substances discharged to the sewerage system. These agreements often involve setting appropriate charges and limits for the discharge of waste. Trash rack Grill placed across stormwater channels to collect rubbish and other pollution. Treatment Primary sewage treatment is the process where as much solid material is removed as possible then released to the ocean.
Primary treatment occurs at coastal sewage treatment plants.
Secondary sewage treatment occurs at inland sewage treatment plants. The same principle as primary treatment is followed with added processes to break down the residue. Tertiary sewage treatment is a further, more extensive sewage treatment that aims to further reduce the suspended solids. The shallow ponds maximise the disinfecting properties of the sun's ultraviolet rays. A final dose of chlorine completes the treatment.