Belmar Heat Pump Evaporators / Concentrators exploit the combined effect of vacuum and heat pump technology to obtain fluid distillation at low temperatures with an energy consumption of 160 kW/m3. The boiling pressure in the chamber is set at 5-6 KPa (absolute), so that the boiling temperature of the water is around 35°C, much lower than that at atmospheric pressure. This generates an excellent distillate quality, that can be reused back in the process or discharged to sewer without further treatment.

Heat Pump Evaporation Technology

The liquid to be concentrated, is sucked into the evaporator chamber  (1) automatically under vacuum. The distillate circulation pump and ejector create a vacuum inside the evaporation chamber. The fluid compressor (4)  is operated to compress the refrigerant gas. This compression generates heat @ approx. 60-70°C. The compressed gas is then conveyed into the coil heat exchanger (5). The heat generated is transferred to the process liquid, It releases almost all of the heat generated by the compression of the refrigerant gas, with the majority of the heat being released from the refrigerant gas circuit the remaining heat is lost through the fan air cooler (8). The refrigerant gas has released its heat to the liquid to be evaporated, and has lost the residual heat in the fan air- cooler (8). The gas is now directed into the condensate cooling chamber ( 9) via expansion valve (6), where the refrigerant gas expands, and produces a cooling effect.

The water vapour generated in the evaporation chamber rises towards the cooling coil where the steam vapour condenses on contact with the cold surface of the cooling coil (9). From the bottom the condensation chamber the distillate is removed by the Venturi-tube (ejector) at (11) and conveyed to the distillate storage (2).The recovered distillate overflows out of distillate storage to the external collection system for either reuse or discharge to drain. To maintain the desired concentration factor in the evaporator chamber it is necessary to purge liquid from the system. Concentrated liquid is released via time controlled valve and pump (3), there is no requirement to break the vacuum for this procedure. The evaporator can be run either on a continuous basis or as a batch process. The working cycle is fully automatic with critical safety interlocks.

Heat Pump Evaporation Operation

Industry Applications

Machining Operations

Cutting oils, emulsions and washing effluents. Primarily a waste reduction technology to save on disposal costs.

Surface treatment

Phosphating, Chrome passivates. Concentration of rinses and spent baths. In combination with an ion exchange system process lines can literally run with zero  waste water to drain.


Recycling of rinse water, concentration of spent process solutions, recovery of precious metals.

Photo shops

Concentration of all aqueous wastes to save on disposal costs.

Chemical industries

Recycling of products through concentrating of rinse water produced from equipment cleaning.

Heat Pump Evaporator 15000 l/day


Distillation throughput from 10 to 42 L/hour
Low temperature vacuum evaporator with heat pump, powered with electrical energy for semi-solid concentrates. Custom configured to obtain sludge, semi solid concentration and to concentrate fouling wastewater, saline water and high density waters. To be installed wherever an extremely strong concentration is required. Ideal to recycle valuable raw materials (metals and salts). Suitable for ZLD installation, food & beverage (electropolished version available on demand), chemical & pharmaceutical, cosmetic, plant extracts and flavourings, galvanizing, gold industry, mechanic industry, heat treatment (quenching and tempering), TREATMENT OF CONCENTRATE FROM EVAPORATORS/CONCENTRATOR. Detachable boiling vessel with large front and rear hatches with man access, external jacketed heat exchanger, large manways and sight glass with illuminator, built-in condensation section, full automatic operation with PLC and touch screen.

Eco Dry for salt production

ECO Dry with Scraper Screw

Material Options
  •  Standard construction in AISI 316 L stainless steel for less corrosive applications
  •  High Chloride Applications materials such as DUPLEX (SAF 2205), SUPER DUPLEX (SAF 2507)

Contact Belmar today to discuss your Waste Treatment & Recycling application!
We can provide laboratory testing, pilot plants
and full size industrial systems.