1.- What is the evaporation?

Evaporation is a process used to remove water from a feed stream, resulting in a concentrated discharge stream and a separated water stream.

In a typical evaporator, the feed solution is heated to reduce the required heat input. This is achieved through a feed preheating heat exchanger, which transfers sensible heat from the hot condensate to the colder feed stream.

Subsequently, the heated feed stream is mixed with the evaporator liquid, and this mixture is further heated through the main heat exchanger. This heat exchanger can utilize various forms of energy, such as steam, electricity, or hot oil, to heat the mixture.

The heat supplied by the main heat exchanger is used to boil the evaporator liquid, thereby producing a concentrated liquid stream and a water vapor stream. The vapor can then be discharged directly or condensed back into liquid water, as needed.


2.- Is my wastewater appropiate to evaporate?

Are you wondering if your aqueous waste is compatible with an evaporation-centered treatment? ZEWATECH not only offers various treatments but also advises and provides laboratory pilot tests to determine the composition of your water and the different possibilities available to reduce the costs associated with processing waste.

The waste to be treated should be water-based with no more than 20% solids concentration. As long as these requirements are met, ZEWATECH has experience in designing and manufacturing equipment that covers many different types of waste.

info@zewatech.com // +34 977 81 70 54

The ZEWATECH solution consists of several well-defined steps so that the client has all the data at hand when deciding whether evaporation is the chosen method:

1 – Pre-investment studies

2 – Laboratory testing

3 – Technical-economic proposal

4 – Semi-industrial pilot rental

5 – Joint audit with the client CAPEX/OPEX

6 – Project development

7 – Manufacturing and installation

8 – Equipment commissioning training

9 – Comprehensive support and maintenance

3.- Is evaporation better than other waste treatment method?

The main advantage of evaporation over other systems is the performance guarantee. Evaporators offer high reliability and robustness. Additionally, they have other advantages such as requiring minimal control and maintenance and generating few residues.

4.- What is the mechanicalvapour compression (MVC)?

Mechanical vapor compression is a process used to increase the temperature and pressure of a vapor stream to produce another vapor stream or to separate volatile components from a liquid mixture.

In this process, a vapor stream is mechanically compressed through a compressor, which increases its temperature and pressure. Then, the compressed vapor stream is cooled and condensed in a heat exchanger, producing a concentrated liquid stream and a vapor stream.

The development of mechanical vapor compression technology has a significant advantage in energy savings. In other types of evaporators, a parallel refrigeration system is required to control the temperature of a gas, which exchanges energy with the wastewater stream. In contrast, in mechanical vapor compression, the only equipment that consumes electricity is the compressor before the heat exchanger. Therefore, it requires less power, resulting in cost savings as well.

5.-What is a Heat Pump Evaporator?

A heat pump evaporator is an industrial evaporator that regulates the temperature of wastewater using a refrigeration system. It consists of various components such as compressors or heat exchangers that provide and extract energy from the system to control the evaporation and condensation of wastewater.

ZEWATECH has extensive experience in this technology and in the manufacturing of evaporators with heat pumps. It is considered one of the most reliable and robust technologies for treating aqueous waste.


6.- What is the fluidized bed?

The fluidized bed is a commonly used technique in the industry to improve heat exchange efficiency and reduce maintenance costs. Heat exchangers are devices that transfer heat from one medium to another and are often used in industrial evaporators involving fluids and gases.

During the operation of the heat exchanger, wastewater can deposit sediments or scale on the internal walls of the exchanger, reducing heat exchange efficiency and increasing maintenance costs due to frequent cleaning requirements. Ceramic balls are used to effectively remove these deposits and prevent costly maintenance.

Ceramic balls are small, porous ceramic spheres that are introduced into the heat exchanger and circulated along with the working fluids. As these balls circulate, they collide with each other and against the walls of the heat exchanger, creating an abrasive effect that removes deposits and sediments from the internal walls of the exchanger. The balls can also help prevent the formation of new deposits by keeping the internal walls of the exchanger clean.

Thanks to ZEWATECH’s technology, these balls circulate within the heat exchanger and its accompanying circuit without reaching other equipment, ensuring the integrity of other components.

7.- What is the osmosis reject?

The reject water in the reverse osmosis process is the water that is not used during the production of purified water. This water contains a high concentration of salts and other contaminants that have not been retained by the reverse osmosis membranes.

Although reject water is typically discarded, it can be an environmental issue if not managed properly. In general, reject water is discharged into rivers, seas, or underground aquifers, which can cause environmental and public health problems.

In summary, reverse osmosis reject water is an environmental and resource management issue that needs to be addressed appropriately. The treatment and reuse of reject water can contribute to environmental preservation and the conservation of water resources.

By using ZEWATECH evaporators, water consumption is significantly reduced as they do not require additional water input. Furthermore, they allow for the recovery and reuse of both waste and water, thanks to their purity after proper treatment.

8.- The use of evaporators to dehydrate reject streams from reverse osmosis (RO)

The use of evaporators to dehydrate reject streams from reverse osmosis (RO) is a common and effective method for managing RO reject water. RO is a water purification process that produces purified water and a reject stream with a high concentration of contaminants.

Evaporators work by heating the reject water and causing it to evaporate, leaving behind concentrated solids. The evaporated water vapor can be condensed and collected as clean, purified water, while the concentrated solids can be further processed or disposed of appropriately.

Here’s how the process typically works:

  1. RO Reject Water: The reject water from the RO process is typically high in salinity and may contain various contaminants.

  2. Pre-treatment: Before feeding the reject water into the evaporator, it may undergo pre-treatment steps to remove large particles or debris.

  3. Evaporation: The reject water is heated in the evaporator, causing it to evaporate. The water vapor is separated from the concentrated solids.

  4. Condensation: The water vapor is condensed back into liquid form, resulting in purified water.

  5. Concentrated Solids: The remaining concentrated solids, which may include salts and contaminants, are collected for further treatment or disposal.

  6. Reuse or Disposal: The purified water can often be reused for various purposes, depending on its quality. The concentrated solids may be disposed of according to regulations.

Using evaporators for RO reject water is an effective way to minimize waste and recover clean water for reuse. It helps reduce the environmental impact of disposing of concentrated contaminants and is particularly valuable in industries where water is a critical resource.

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