The Envidest MVR FC evaporators for wastewater treatment are vacuum concentration systems designed for the treatment of industrial wastewater. The Envidest series have a proven high efficiency in the treatment of industrial effluents that can not be treated with traditional technologies, such as saline water (or brines), oily water, washing water, reverse osmosis reject, etc.

As the cost of disposing of wastewater continues to increase, many companies are assessing the potential to recycle some or all of their wastewater. Industrial sectors such as Automotive, Food and Beverage and Pharmaceutical are examples of industries that currently treat their wastewater with primary and secondary wastewater treatments, and are now actively engaged in assessing the potential for additional cost savings by recycling of the wastewater.

The Envidest MVR FC evaporators for wastewater treatment allow the treatment of effluents that are otherwise extremely difficult to treat and are usually sent to an external waste management company. It is a very efficient system that has been successfully installed in a wide range of industrial activities. The following video shows in great detail how the Envidest MVR FC, a Forced Circulation evaporator for wastewater treatment, works:

The Envidest MVR FC system is capable of producing distillate water flows up to 2.000 litres/hour.

Evaporators for wastewater treatment – Envidest MVR FC Operation

Simply turn on the vacuum pump from the main control panel and the Evaporator Boiler Tank fills. Due to the system being under vacuum, values close to 600 millibar (mb) (0.6bar) are generated.

Once the Boiler tank is full it activates the recirculation pump and the electrical resistors start working to reach an operating temperature of 60ÂşC (1400F).

When the temperature is reached the electrical resistors stop and due to the vacuum of the system, a value in the region of 240mb (2.4bar) is reached within the Evaporator Boiler Tank.

From this point the wastewater begins to evaporate and the root pump activates. This takes in the evaporated wastewater from the boiler tank and compresses it by elevating the temperature and vapour pressure. It then transfers the treated wastewater to the large plate heat exchanger. In the plate heat exchanger incoming cooler raw wastewater is on one side of the plate, on the opposite side of the plate as a counter current is the evaporated wastewater vapour.

Due to the temperature difference between both sides of the plates, the cooler incoming wastewater is heated up and the wastewater vapour loses heat, condenses and reverts back to a liquid. This liquid, termed Distillate, comes out of the heat exchanger and is collected in a Distillate Tank.

The incoming raw wastewater, which has now benefitted from the transferred heat in the plate heat exchanger, flows into the initial Evaporator Boiler Tank.

As the level in the initial Evaporator Boiler Tank falls, an inlet feed valve opens automatically allowing wastewater in.

The distillate which has built up in the distillate tank is discharged via a centrifugal pump. This distillate goes through a second plate heat exchanger. On the reverse side of the plates in this section is the initial incoming raw wastewater. This additional heat exchange further increases the efficiency of the system by increasing the temperature of the raw wastewater. It also assists in cooling down further the discharging distillate.

As the system continues to treat the wastewater the Evaporator Boiler Tank increases in concentration, the unit will be set up to undertake programmed partial discharges of this concentrate wastewater, this will be returned to the wastewater supply tank.

By Sergio Tuset

Over 30 years’ experience in management of industrial companies. Specially focused on environmental projects for customers, recognized specialist in conceptual engineering applied in wastewater, liquid &solid wastes, and air pollution. Teamwork, leadership, and expertise in Project Managing. Industrial process consulting