Chemical-physical process

TECN.A., in more than 25 years experience, has developed a very keen knowledge of the problems related to pollution and consequent purification processes.

The chemical-physical processes are purification processes addressed to make the precipitation of the pollutants from the polluted water. The pollutants will be in the form of insoluble salts and hydroxides which, separated from the waters are disposed as mud after being dehydrated in the chamber filter press.

The alkaline pH dosage of sodium hydroxide and lime allows the separation of most of the pollutants found in the effluents.

The precipitation of hydroxides may not be enough when strong complexes are present, and it becomes then necessary to proceed to the metal precipitation through sulfides as well.

The organic substances and surfactants can be demolished (up to 90%) with the oxidation Fenton process, through the proportion of ferrous ions and hydrogen peroxide, exploiting all the oxidative strength of the radical OH*.

To obtain the separation of mud from clear solution, TECN.A. uses inclined plate clarifiers which, offering a very large settling surface area for the solid-liquid separation in a very small footprint, allow us to reduce the overall dimensions of our systems.

The chemical-physical systems proposed by TECN.A. may be of two types:

  1. The "continuous" type, where reactions happen in separate reaction tanks, sized to guarantee an adequate time of contact. These systems are normally used for medium-big volumes of effluents.
  2. The “discontinuous” or "batch" type, where treatment is done all in one tank in which the necessary reactants are sequentially proportioned. These systems are used for a reduced flow volume.

All chemical-physical systems  are often combined with a  subsequent filtration section, which may be of a mechanical type (sand filters or cartridges) or  adsorbent, with activated carbon, or ion exchange with selective resins.

These three filtration systems may be combined together in a single final polishing section.



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