Wastewater treatment

wastewater treatment using vacuum evaporation
Wastewater treatment using vacuum evaporation

Vacuum evaporation is one of the most efficient procedures for the treatment of industrial effluents, as it enables the very effective separation of contaminants that are found in the water. It is an indispensable technology for companies that wish to implement a zero waste system.

After a process of evaporation, very high percentages of distilled water are achieved (95% at least) and a very low amount of rejection (no more than 5%) to be managed. This rejection is so low due to the high concentration of residues that the process achieves. Thanks to this, industries that have to treat medium or large flows can benefit from important savings, as the volume of residues that they have to send to be managed is considerably reduced. This technology is also very suitable for the production of high quality water that numerous industries require for incorporation in their productive processes.

Advantages of vacuum evaporators

  • High quality of distillate
  • Possibility of recovering up to 97% clean water
  • Enables the reuse of treated water
  • Can treat more complex effluents
  • Low power consumption
  • Flexible and compact design of the machines
  • It is an easy-to-use technology and requires very little maintenance
  • High reduction and concentration of liquid residues

Another factor to mention regarding vacuum evaporators is their versatility, and the large number of situations in which they can be applied (providing that the results justify the necessary investment for their installation, as it isn’t the cheapest technology).

Vacuum evaporators are particularly suited to the separation and treatment of

  • Dissolved hydrocarbons in contaminated water
  • Oil emulsions
  • Treatment of leachates
  • Galvanic plating rinsing water
  • Degreasing water
  • Water with a high content of oily substances
  • Water with a high content of heavy metals
  • Water with a high content of dissolved salt
It is usual for a process of vacuum evaporation for wastewater treatment to be completed with other technologies

These complementary effluent treatment technologies can be applied beforehand (membranes, physical-chemical processes, etc.), submitting the effluent to a pre-treatment that facilitates the process of evaporation, or afterward, if you wish to achieve an even better concentrate. In the latter case, the most appropriate technology is crystallizers, which can be used in two ways:

  1. The crystallizer can be used as a final stage after a standard evaporation process.
  2. The evaporator and crystallizer can be integrated in one unit that combines both processes. This solution is appropriate for small and difficult to treat volumes.

Depending on the composition of the wastewater to be treated, a process of evapo-crystallization allows the separation of its components and the recuperation of secondary products, which can be reused or sold. This is what happens with the oil of oily water, which can be sold as a secondary product with a water content of less than 5%, or with the recuperation of aluminum hydroxide, which can subsequently be used as a chemical product, to mention just a few examples.