Although few countries have as yet enacted legislation to control the discharge of soil and waste water from ships, the pressures being applied by environmental protection groups are gradually bringing such controls into being or causing port and health authorities to more rigorously enforce existing powers. Unfortunately there is at present no co-ordination of pollution prevention legislation. The shipowner considering shipboard sewage treatment equipment is thus in a difficult dilemma. Only one safe course is open to the owner--to retain all waste entirely aboard the ship during the stay in enclosed waters. The usual objections to sewage retention system are the space they occupy. Because the Electrolux Vacuum System uses only a tenth of the water volume required for flushing ordinary WC's, the volume of collecting tanks is correspondingly reduced. Their location is simplified and the expense of installation is cut. Other savings are achieved through the use of small bore plastic pipework and the freedom in design. The principle of the system is simple. Air is used to transport the soil to a collecting tank. The small amount of water that is used is intended to clean the surfaces of the bowl and maintain a pool of water in the bowl. The vacuum pump maintains a vacuum of approximately 0.5 atmospheres in the entire pumping system including the tank. Accessories for discharging depend on the methods expected to be used. A vacuum relief valve and a hose connection are all that are needed for emptying by sludge truck.

  • Corporate Authors:

    Engineering, Chemical and Marine Press, Limited

    33-39 Bowling Green Lane
    London EC1P 1AH,   England 
  • Publication Date: 1972-5-26

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00035929
  • Record Type: Publication
  • Source Agency: Journal of the Israel Shipping Research Institute
  • Files: TRIS
  • Created Date: Oct 20 1973 12:00AM