Biological Sewage Treatment for Marine Applications

The new Evac EcoTreat biological wastewater treatment plant is claimed to deliver the best of both worlds for owners of small vessels, with cost-effective treatment of black and gray water that meets and exceeds the latest environmental standards.

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

It is a 100% biological system for the efficient treatment of black wastewater from toilets and urinals and gray wastewater from washbasins, sinks, and showers. Evac says that treating waste water in this way completely eliminates the need for any chemicals, filters, or membranes.

The plant has been designed to make operation and maintenance as easy and cost effective as possible, while its compact footprint and low weight is said to make it suitable for smaller vessels where space restrictions may be tight.

OPERATING PRINCIPLE
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.” 

Source: Maritime Journal

Media

Taxonomy

• Sewage Treatment
• Waste Water Treatments
• Wastewater Treatment
• Marine
• Sewage

1 Comment

1. Hello this presentation remains as a result of a theoretical application where everything works perfectly.

   We're talking about biological treatment but it is not known how the treatment is. 

   We talk of biological treatment, but without knowing the treatment (purification, filtration, sedimentation, etc)

   And especially the biggest hoax of this post is to make believe that there is a biological treatment. Except that to perform a biological treatment, there are three main data:

   1. that the effluent to manage, features - biological - necessary for the principle of biodegradation

   2 the principle of biodegradation is activated

   2. that the treatment process is totally - organic -

   The presentation defines the use of chemical is no longer necessary. We see nowhere the mandatory recommendation to preserve the - organic - characteristic of water waste which therefore may no longer be - biological -.

   The presentation vacuum sets that the device works closed, without contact with the ambient atmophere. The effluent will quickly come into putrefaction and in this State there is more possibility of biological - treatment-

   At sea or water users will get rid quickly of their wastewater scattered in the natural water environment. It will be difficult to determine the rate of pollution generated by this system.

   When the ship will anchor the effluent will be scattered in the place of anchorage heavily polluting the environment.

   The question that must be posed: why and how can we make or use organic without being totally organic? The man of today through the communication of a none - biological - system bring into disrepute - biological - characteristic of all the living on Earth which it is part.