BEHAVIOR OF SEWAGE EFFLUENT OIL AND GREASE IN THE OCEAN

This paper describes a laboratory and field study of the behavior of s ewage oil and grease after discharge to an ocean environment. The labo ratory program was used to study the factors affecting coagulation and to determine if discharge through an ocean outfall enhances coagulati on leading to an increase in concentration of floatable material on th e ocean surface. A field study was conducted at Burwood Beach near New castle on the New South Wales coast to quantify the amount of oil and grease reaching the ocean surface from the outfall, to measure the siz e of particles of grease on the surface near the outfall, and to deter mine the conditions that lead to the formation of visible slicks and o bservable floatable material for an outfall discharging primary treate d sewage.