- Suitable for treating large volumes of wastewater
- Thermal energy: hot water or steam
- One, two, and three effects available
MODELS AND MAIN TECHNICAL FEATURES
We design and manufacture multiple-effect vacuum evaporators for the treatment of high wastewater flow rates, available with one, two, and three effects.
Multiple-effect evaporators are designed for continuous operation in industries with available waste heat, where the savings in operating costs offset the higher initial investment.
We offer a wide range of wastewater evaporators to adapt to the characteristics of any industry and application.
We manufacture two models:
Technology: Thermal energy evaporation
Capacity (l/day): 4000 to 30000
Electrical consumption per 1 m³ of distillate produced: 4 to 12 kWh/m³
Thermal energy for evaporation: 130 to 315 kWht
Thermal energy for condensation: 130 to 315 kWht
Vacuum (1st/2nd/3rd Effect): ≈ 310/200/125 mbar
Evaporation temperature (1st/2nd/3rd Effect): ≈ 70/60/50°C
Technology: Forced Circulation (FC) thermal energy evaporation
Capacity (l/day): 20000 to 200000
Electricity consumption per 1 m³ of distillate produced: 20 to 110 kWh/m³
Thermal energy for evaporation: 630 to 2100 kWht
Thermal energy for condensation: 630 to 2100 kWht
Vacuum (1st/2nd/3rd Effect): ≈ 310/200/125 mbar
Evaporation temperature (1st/2nd/3rd Effect): ≈ 70/60/50°C
WHICH MULTIPLE-EFFECT EVAPORATOR BEST SUITS YOUR NEEDS?
Use the following table to compare the main selection criteria and determine which single- or multiple-effect thermal evaporator is most suitable for your application.
| Model | Capacity | Considerations | Application | Advantages |
|---|---|---|---|---|
| ENVIDEST DPM 1 | 4.000–10.000 L/day | Consider when suitable low-cost heat is available and it is difficult to economically justify additional effects. | Lower wastewater volumes for which a simpler configuration is preferred | Single-effect evaporation with a submerged U-tube heat exchanger. Suitable for low-pollutant-load aqueous streams, with flexible component arrangement. |
| ENVIDEST DPM 2 | 8.000–20.000 L/day | Reuses the vapor from the first effect to heat the second, reducing the specific thermal demand compared with single-effect evaporation. | Low-pollutant-load aqueous wastewater requiring two-effect concentration | Two effects with submerged U-tube heat exchangers. The modular arrangement adapts to different installation layouts. |
| ENVIDEST DPM 3 | 12.000–30.000 L/day | Consider when lifetime thermal savings justify the additional effect. | Low-pollutant-load aqueous wastewater where greater heat recovery is prioritized | Three effects with submerged U-tube heat exchangers, extending heat reuse to an additional stage. |
| ENVIDEST MFE 1 | 20.000–130.000 L/day | Consider when sufficient low-cost thermal energy is available and the single-effect configuration meets the project's economic criteria. | Larger wastewater volumes requiring forced circulation in a single-effect configuration | Forced circulation promotes heat transfer and helps limit fouling in the main heat exchanger. Designed for large volumes of low-pollutant-load aqueous streams. |
| ENVIDEST MFE 2 | 30.000–120.000 L/day | Combines two-stage heat recovery with forced circulation; the pumps' electricity consumption must be included in the operating cost assessment. | Larger wastewater volumes requiring forced circulation and two-effect heat recovery | A recirculation pump in each effect promotes heat transfer and helps control deposits. |
| ENVIDEST MFE 3 | 30.000–200.000 L/day | Additional heat recovery reduces external thermal requirements per unit of evaporated water, depending on the operating conditions. | Large wastewater volumes where reducing the specific thermal demand is prioritized | Three effects with forced circulation at each stage. Offers the highest published capacity of these two product families. |
Published reference capacities. The actual flow rate of treated wastewater depends on the feed composition, boiling-point elevation, fouling tendency, and required final concentration.
Select the number of effects by evaluating heating and cooling temperatures, annual operating hours, energy prices, space, and investment. A greater number of effects improves heat recovery, but the most economically favorable solution depends on the operating conditions of each installation.
MAIN OPERATIONAL ADVANTAGES
- Robust and reliable evaporator capable of continuously treating large volumes of wastewater. These are the models with the highest treatment capacity.
- Multiple-effect vacuum evaporators optimize energy efficiency by reusing the vapor generated at each stage as a heat source for the next, operating at progressively lower pressures and temperatures.
- Each stage operates at a lower temperature than the previous one, which helps protect products that require a low temperature to prevent degradation.
- Highly competitive operating costs when thermal energy is available at the plant.
MAIN COMPONENTS OF EACH MODEL
The following video shows various real installations where our multiple-effect evaporators are operational:
OPERATION OF OUR MULTIPLE-EFFECT VACUUM EVAPORATORS
External heat input and initial evaporation
The process begins in the first effect, which operates at the highest temperature and pressure in the system. The first effect is the only one that requires external energy.
When the effluent to be treated reaches its boiling point, vapor is generated, which becomes the heating medium for the next stage.
All subsequent effects reuse the vapor generated internally.
Cascade evaporation through a pressure and temperature gradient
The evaporator consists of different effects arranged in series. Each effect operates at a lower temperature and pressure than the previous one.
The vapor from one effect condenses in the heat exchanger of the following effect. The latent heat released causes boiling in that subsequent stage.
Energy reuse and increased efficiency
Each kilogram of primary steam is reused multiple times. A 3-effect evaporator can produce approximately three times more distillate than a single-effect system with a similar primary energy input.
This significantly reduces the specific energy consumption (kWh per cubic meter of distillate).
Final condensate and vacuum control
The vapor produced in the last effect is directed to a condenser connected to a vacuum system, where it condenses into distillate.
Non-condensable gases are removed to maintain vacuum stability. The pressure difference between the effects ensures proper condensation and boiling at each stage.
3D VIDEO ANIMATION
The following video is a 3D animation that shows step by step how our multiple-effect evaporators work.
CONFIGURATIONS OF MULTIPLE-EFFECT VACUUM EVAPORATORS
At Condorchem Enviro Solutions, we manufacture two models of multi-effect vacuum evaporators, each available in one-, two-, and three-effect configurations. This variety of models and configurations allows us to adapt to a wide range of treatment capacities, energy availability, and budgetary constraints.
Single-effect units are ideal for lower volumes or when simplicity and reduced CAPEX are priorities. Two- and three-effect evaporators are designed for higher flow rates and continuous operation, optimizing long-term OPEX by significantly reducing energy consumption through the reuse of latent heat.
