Sewage treatment plant, Feed Flow Rate(m3/day or m3/hr) : 51-100 m3/day

System Features:

• Developed using the state-of-the-art "Submerged fixed bed bio-film process".
• Type-tested in accordance with IMO Res. MEPC (VI) annex IV.
• Approved by the US Coast Guard for non-US flag vessels.
• Use of all-aerobic sewage treatment method prevents methane gas forming.
• Problem-free operation, low operating costs.
• Non-sensitive to long shutdown periods doe to continuous activated sludge return flow.
• Can be used in gravity systems and all vacuum systems
• Fixed bed bio-film process produces excellent treatment results
• Up to 15 times more activated sludge area than conventional systems
• Custom-built systems for limited space availability or retrofitting.

The DVZ-SKA "BIOMASTER" system has been developed using the state-of-the-art "submerged fixed bed bio-film process". The advantage of this treatment method is its extremely large reactive area, whicj is up to 15 times larger than that of conventional systems. Within a short time this area is occupied by active micro-organisms, thus forming a so-called sheet of bio-mass. The sewage to be cleaned has flow through this bio-mass and is cleaned using organic methods. The supply of small oxygen bubbles aerobically stimulates the organisms into extreme activity. Disgested sludge formation is prevented by continuously feeding avtivated sludge back into the active system. The return flow of activated sludge also compensates for an intermitted supply of supply of sewage and allows shutdown periods of approx. 1 week without the bio-systems breaking down.

The intrinsic dynamics of the bio-film process are one of its major advantages, i.e. no activators or the like are required to start up the system since the active micro-organisms naturally develop from the sewage.

According to international regulations (MARPOL 74/78), raw ship's sewage must not be released into coastal waters or so-called "restricted areas". Ship's sewage from toilets and urinals is designated "black water". "Grey water" is all other water from baths, showers, washbasins and the galley. Galley waste water is fed to the sewage treatment system via a fat separator (DVZ-FT).

"Grey water" does not need to be treated, but merely made germ-free by means of disinfecting.