Chemical-physical purification plants are used for the removal of pollutants that are generally poorly biodegradable, such as phosphoric nutrients, surfactants, phenols, etc. The treatment takes place through the addition of specific additives, under particular pH conditions, which react with the pollutants, rendering them insoluble and favouring their removal through coagulation, precipitation or neutralisation. As with traditional biological plants, we aim to provide optimal solutions from a technical and operational point of view, guaranteeing the removal of pollutants with limited investment.
A classic chemical-physical plant consists of the following treatment steps:
– insolubilisation of metallic salts in a basic or acid environment
-dewatering and sludge disposal
In the first phase, the salts present in the dissolved form are made insoluble, generally turning them into hydroxides. The subsequent dosing of the reagents favours the flocculation of the suspended particles, favouring the formation of flocs; a polyelectrolyte can be added for better sedimentation. The final separation section aims to clarify the water by separating the sludge, which settles at the bottom of the decanter, from the purified water. The latter are sent to a neutralisation section and final refinement treatments with tertiary treatments, while the collected sludge is sent to a dedicated treatment.
Here below some of works
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New chemical-physical treatment section, consisting of reaction and reagent storage tanks. The system is used for the treatment of non-homogeneous wastewater (treatment of liquid waste for third parties).
Supply and installation of a chemical-physical wastewater treatment plant. The system, which essentially provides for the removal of ALUMINUM AND ZINC, before the executive design and construction was previously studied and fine-tuned through laboratory tests.
New sludge separation section for the chemical-physical treatment section, built by a rectangular settler, designed specifically for the application in question and equipped with a system for reducing and removing surface foams.
Supply of a turnkey plant with generous equalization where the wastewater is kept at neutral pH with acid dosage and subsequently fed to a series of reactors which, by adding lime, iron chloride and polyelectrolyte, allow the separation of suspended solids and colloids, reducing their loading to the subsequent sections of the system. The separation of the sludge takes place through flotation. The waters continue to biological treatment for subsequent discharge into the public sewer within the limits of the law.
Design, supply and construction management of a chemical-physical wastewater treatment plant (rich in fluorides) deriving from the glass processing / acid etching processes, with particular attention to the maximum possible reuse of the equipment / technologies already existing in the field. New stations and control units for the preparation and dosing of chemicals. Optimization of the existing sludge treatment unit with the addition of a final “bag” filtration system. General consultancy for the revamping and management of the biological section of the plant aimed at removing nitrogen compounds (ammonia) from wastewater destined for discharge into surface waters.
The company performs the satin finishing of the glass and uses chemical agents such as hydrofluoric acid, hydrochloric acid and ammonia (all produced in aqueous solution) mixed with water. For the treatment of the waste generated by the production, a chemical-physical plant was supplied with a double reaction stage with specific chemical reagents, precipitation and sludge dehydration. The system guarantees the removal of ammonia and fluorides within the legal limits for discharge into the public sewer.
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