Wastewater Electrochemical Treatment Technology for Oily Water, WETT-O is the first Type Approved electrochemical treatment system for marine oily bilge water.

The system has received USCG and IMO MEPC.107(49) certification and can treat 5 or 15 ppm discharge as selected by the operator. WETT-O meets the most stringent discharge standards available for shipboard Oily Water Separators.

The system has been evaluated on commercial and government vessels, and is immune to the effects of ship motion including pitch, roll, and vibration.

WETT-O can also be used for other oily wastewater, such as vehicle wash water and industrial oily water.

Technical Details

WETT-O is a lightweight compact unit based on coalescence separation of free oil in a free oil separator (FOS), followed by one or more proprietary self-cleaning anti-passivating electrocoagulation (EC) units and a fluorescence-based Type Approved Oil Content Monitor (OCM).

WETT-O breaks the oily emulsions contained in bilge water and produces an effluent with less than 5 ppm of oil. As well, it removes many pollutants such as large solids, suspended solids, free oil, colloids, organics, phosphorus, and heavy metals.

Features

WETT-O features include:

  • Effective, compact, and robust

  • Makes use of sacrificial metal electrodes

  • Significantly reduced maintenance

  • Operates continuously 24/7 without operator attendance

  • Treatment capacities between 1.44 m3/d (380 gal/d) and 10.8 m3/d (2853 gal/d)

  • Option of selecting 5 ppm or 15 ppm discharge setting

WETT-O does not require:

  • Pre-treatment

  • Heating

  • Biological treatment

  • Chemical reagents

  • Separation tanks

  • Filters or membranes

  • Adsorbent media

Water Recycling Products

WETT-O

For oily water and bilge water

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WETT-G

For greywater treatment and reuse

WETT-G is an approach for treating greywater (GW) originating from showers, bathing, and laundry so that it can be reused in various ways rather than being discharged to the environment. The use of potable water - often limited and costly - can then be reserved for applications where it is truly required.

WETT-G was demonstrated at a Leeds Platinum certified eco-chalet, and can be integrated into individual dwellings or scaled-up for communities of several hundred individuals.

Depending on the approach selected, significant potable water savings can be realized for domestic, community, or industrial applications.

Technical Details

Unlike most commercially available GW systems, WETT-G does not rely on biological treatment or the use of filters and membranes. Instead, the unique WETT modules are used, including the EC unit which is the core element of this technology.

No EO unit is required, although depending on the level of treatment desired and the intended use of the treated GW, various qualities of treated GW can be produced by modulating treatment conditions and adding polishing and disinfecting units after the core EC unit.

WETT-G produces perfectly clear, turbidity-free water. Potential uses of the treated GW include:

  • Shower water

  • Laundry water

  • Irrigation

  • Toilet flushing

  • Vehicle washing

  • Cleaning

  • Process water

Features

WETT-G features include the following:

  • Operates automatically so long as there is GW to treat

  • Shuts down automatically when there is no GW left to treat

  • Performs a daily automated self-cleaning procedure

  • On/off capability

  • Produces treated water as soon as it is turned on

  • No operator required

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WETT-S

For treatment of sewage and highly contaminated water

WETT-S tackles sewage, concentrated sewage, and industrial wastewater. While domestic and community situations usually produce typical municipal sewage, situations with low per capita water usage or separate greywater (GW) and blackwater (BW) collection may generate highly concentrated wastewater.

Such situations include:

  • Ships and sea platforms

  • Isolated habitats such as mining, research, exploratory, and military camps

  • Small communities with a high cost for potable water

  • Northern communities

WETT-S has been trialed on a government vessel for BW and has been containerized for evaluation by the US Army for highly contaminated sewage generated by Forward Operating Bases.

Technical Details

As with all WETT products, WETT-S is based on the proprietary self-cleaning passivation-resistant EC unit as a first stage of removing approximately 75% of all contaminants. Unlike GW which has been treated by EC, sewage or BW still contains a high concentration of COD and BOD after this stage.

Thus in WETT-S, EC is followed by electrochemical oxidation (EO) to destroy dissolved organics and convert them to CO2 which is harmlessly discharged. EO is based on Boron Doped Diamond (BDD) electrodes, which are robust and able to produce highly reactive hydroxyl radicals.

Once through the EC and EO, the treated BW is now fully disinfected and ready for discharge to the environment. If required, additional treatment modules which can be added include a BF for complete turbidity removal and an oxidant decomposition (OD) unit especially for BW streams with a high concentration of seawater.

Features

WETT-S has a number of truly unique features which are not available with typical sewage treatment approaches:

  • Entirely electrochemical

  • No micro/ultra/nano filtration, no membranes!

  • No biological treatment, no chemical addition

  • Immediate treatment, on/off capability

  • Reduces COD, BOD, TSS

  • Complete disinfection

  • Removes nutrients (P, N) and heavy metals

  • Not affected by toxic compounds, fats, oils, and grease

  • Not affected by variable hydraulic loadings or concentrations

  • Compact and automated

  • No operator attendance

  • Periodic minimal maintenance to change electrodes

Most packaged sewage treatment systems rely on biological treatment which can take several weeks to become effective, thereby eliminating the possibility of on/off treatment.  As well, biological treatment does not adapt well to variable organic loadings, highly concentrated sewage, and is easily upset by temperature changes, cleaning chemicals, soaps, detergents, oil and grease.

Wastewater treated with WETT-S is typically not considered for reuse except for irrigation in some cases.  For discharge to the environment, depending on geographic location and whether this is to land or to surface bodies of water, various discharge standards will apply.

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Wastec’s Mineral Water Purification System
For treatment of raw water

Wastec's mineral water purification system purifies river, lake, rain waster, and underground water as well as seawater into drinking water through the efficient RO membrane filter.

It is easy to drink by mineral addition and is kind to the human body.

Processing speed

Non-seawater: 267L/h. Can support daily drinking requirements of 2136 persons.

Seawater: 107L/h. Can support daily drinking requirements of 865 persons.

Continuous clean water of about 20 hours is possible.

Potential areas of application:

  • Humanitarian and disaster relief operations

  • Remote communities

  • Hotels, hospitals, swimming pools, schools

  • Military operations

  • Fire departments

  • Simple water purification plants

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