Biological treatment includes activated sludge, clarification, and aerobic digestion.
The clarified effluent is filtered through sand filters and chlorinated prior to discharge through the ocean outfall. Biosolids are applied to land owned by Sussex County and agriculturally utilized by crops. Raw sewage is pumped to the treatment plant to a mechanical screen where materials such as rags, metal, garbage and a variety of other materials is removed. After screening to remove large particles, the flow is directed to a grit removal system and on to the flow equalization basin. From there it is pumped to one of the three biological treatment processes.