A shipboard sewage treatment system consisting of: Comminution of solids for ease of transport and further treatment; Electro coagulation of sewage for ease of removal of suspended solids; Solids separation; Soluble BOD reduction with carbon adsorption; Coliform bacteria removal; and Solids incineration was designed to process shipboard sanitary, culinary, and laundry wastes during prolonged sea trials. Advantages of the electrochemical system are given. Waste stream characterization showed the BOD and suspended solids levels of shipboard wastes to be 2 to 3 times the concentrations common to municipal wastes. The development program was successful in demonstrating a practical and economically viable electro-chemical treatment system.