Operating costs

 EnvoTech units are optimized to use a minimum of energy.  
 The power consumption for treating 1 ton of industrial waste water is approx. 25kWh.

Features and Benefits

High degree of separation
Low energy consumption
Clean water for recycling or discharge
Compact design and simple installation
Continuous, automatic operation
Easy maintenance

Application

 Wastewater from alkaline cleaning
Cutting fluids
Rinsing waste from surface treatment
Oil-bearing wastewater
Washwater carrying Teflon and heavy metals

Process

The principal of the EnvoTech unit is evaporation, and it operates on the basis of mechanical vapour compression combined with coalescence-separation.
The unit is divied into a cold and a hot zone.  The hot zone is insulated in order to minimize heat loss to the surroundings.  Start-up and operation is fully automatic.  
Water water is supplied to the holding tank via a self-priming feed pump through two heat exchangers where the incoming waste water is heat exchanged with the outgoing distillate and blow-off gas.  In the starting phase the waste water is heated by electric heating elements, until the working temperature of approx. 100oC has been reached.  The heating elements are then used only to compensate thermal loss to the surroundings.

The waste water is circulated through the "dirty" side of the evaporation heat exchanger.  When the operating temperature has been reached the compressor starts automatically, whereby the produced vapour is drawn from the holding tank through the mechanical foam breaker.

The compressor increases the pressures of the vapour and thus also its temperature before the vapour is transferred to be condensed on the "clean" side of the evaporation heat exchanger.  The energy released by condensation is used to evaporate the waste water on the "dirty" side of the evaporation heat exchanger.  Thus energy circuit is closed.  

The distillate is now led to a coalescer, where any non-polar substances transferred during the evaporation are separated.  From the coalescer the distillate leaves the unit through the large heat exchanger where it is heat exchanged with the incoming waste water.