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Evaled - Model AC R - AC S Series -Wastewater Treatment Crystallizers
The AC R and AC S series evaporators are designed for wastewater treatment and offer the highest level of concentration and solids separation in the entire EVALED range. The models in these series add an internal surface scraping system (auger or oscillating depending on the model) to the effectiveness of low-temperature evaporation provided by the vacuum condition in the boiler, that enables to obtain a semi-solid final concentrate with a dry matter content higher than 75%.
The high concentration capacity coupled with the ability to treat wastewater containing a high content of dissolved or particularly viscous solids, make these evaporators the ideal choice often also as a second concentration step, downstream of a first evaporator that pre-concentrates the initial flow rate. A waste treatment plant in which a first forced circulation unit is combined with a second AC R or S evaporator can achieve a reduction of up to 98% of the initial effluent to be treated.
High concentration factor ZLD
The availability of a cogeneration or flue gas heat recovery plant makes these evaporators especially advantageous as they are able to harness excess thermal energy, thereby lowering the operating costs associated with electricity consumption.
Flow rates of 3 to 12 tonnes/day (960 - 3840 tonnes/year) of distillate produced
Ideal for handling pre-concentrated liquids
The high concentration factor allows ZLD (Zero Liquid Discharge) targets to be achieved, reducing supply costs and water impact, as well as substantially reducing disposal costs.
The right choice when:
- the waste to be treated has a high dissolved salt content
- aiming for ZLD (Zero Liquid Discharge) and thus maximum reduction of disposal volumes and costs
- hot water or a surplus of thermal energy is available on site
- Ideal in the presence of low-cost thermal energy
- High concentration
- Suitable for handling particularly dirty and encrusting liquids
- Batch work mode
- Automated unit
- Remote control
- Ease of use
- Tailor-made
- Service Packages
All EVALED evaporators are standard and modular, frame-mounted automated units to minimise the space required, require minimal labour and maintenance, and are ready to use (plug & play).
Model: Max distillate produced
- AC R 3: 23 tonnes/day
- AC R 6: 6 tonnes/day
- AC S 12: 12 tonnes/day
How EVALED® evaporators work
A multi-effect evaporator uses the steam produced inside the first boiler to produce new steam in the second, at a lower temperature and pressure. This steam recycling can be cascaded (multiple effect) depending on the temperature of the first fluid heating step and the fluid cooling step during the last process. Although it is possible to go beyond two effects, above this number the investment cost becomes considerable and a solution involving a mechanical recompression evaporator becomes more efficient.
HOW DOES A MECHANICAL VAPOR RECOMPRESSION EVAPORATOR WORK?
A mechanical vapor recompression evaporator or MVR utilizes the vapor generated inside the boiling chamber. This is compressed adiabatically (energy consumption depends on the compressor) with very high efficiency, the temperature rises and condensation takes place in the main heat exchanger, which transfers latent heat to the fluid to be evaporated. Furthermore, an auxiliary heat recovery system further optimizes the already extremely low energy consumption (approximately 35-40Wh/liter water, 25 times less than atmospheric evaporation).