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Cost effective biological sewage treatment for marine applications

The new Evac EcoTreat biological wastewater treatment plant is claimed to treat black and gray water cost-effectively meeting at the same time the latest environmental standards, thus proving a boon to the owners of small vessels.

 Available in capacities from 2–11 m3/day, the plant is compatible with both gravity and vacuum-based wastewater collection systems.

 This 100% biological wastewater treatment system , besides being cost-effective, eliminates chemicals, filters or membranes; the plant has been so designed that maintenance and operations are cost-effective; and its compact footprint and light weight no doubt make it suitable for smaller vessels where space restrictions remain considerable.

Evac EcoTreat uses the submerged fixed-film bacteria principle. Black and gray water waste streams are fed to the inlet mixing tank either by gravity or by a vacuum pump. From there, the wastewater is transferred to the bioreactor tank by a macerating pump, which mixes gray and black water and cuts up solids. The wastewater is then driven through the matrix in the bioreactor tank by compressed air that is supplied by diffusers in the bottom of the tank. The air supplies oxygen and also enhances the biological process.

 The treated water flows from the bioreactor tank into the settling tank by gravity, where it passes through the settling matrix. Before being transferred to the clean water tank, the water is exposed to an advanced UV light filter to eradicate all heat-resistant coli bacteria. Any organic or mineral sludge that accumulates in the settling tank is transferred back to the bioreactor tank for further treatment or removal from the system.

 Evac EcoTreat is type approved and wheel-mark certified by DNV in accordance with IMO MEPC 227(64). Furthermore, the plant is also approved by the U.S. Coastguard and Transport Canada.

Mats Riska, Product Manager, Wastewater Treatment Systems at Evac said: “This new solution together with our existing advanced wastewater treatment solutions such as Evac EcoOcean MBBR (moving bed biofilm reactor) and Evac MBR (membrane bioreactor) means we can address the various needs of all our customers in the marine sector.”

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