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Title	NEW VACUUM SEWAGE SYSTEM BY IFO WARTSILA
Accession No	00168298
Journal Title	Shipbuilding and Marine Engineering International Vol. 99 No. 1204
Corp. Authors / Publisher	Whitehall Technical Press Limited
Publication Date	19761200
Description	p. 684-686
Abstract	In the vacuum system, sewage is transported by means of a vacuum. The water closets and other sanitary fittings are connected to a piping system, which is maintained under partial vacuum, through valves that are normally kept closed. The vacuum is generated by one or several vacuum pumps situated at the outlet end of the system. The amount of water used is only 1.2 litres per flushing and so the vacuum system achieves a significant saving in water consumption. The vacuum system can be connected via a special discharge unit to any receptacle under atmospheric pressure. The holding tank can be freely designed with regard to the available space, or an existing space in the ship's structure may be used as an integral holding tank. The discharge from the holding tank can be connected to a sewage treatment plant if the intended route of the vessel is mainly in areas where discharge of untreated sewage is not permitted. In this case a vacuum tank is unnecessary and a special discharge unit would be provided. Owing to the reduction in the volume of the sewage, the treatment plant need not be over-dimensioned to cope with an unnecessary amount of diluted waste water.
TRT Terms	Sewage collection ; Sewage holding tanks ; Sewage treatment ; Ships ; Tanks (Containers)
Other Terms	Holding tanks; Sewage collecting methods; Shipboard sewage treatment
Subject Areas	M14 POLLUTION ABATEMENT AND CONTROL
Availability	Linda Hall Library
Document Source	Engineering Index Source Data: EIX771000342
TRIS Files	MRIS
Database	TRIS Online

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