The physico-chemical wastewater treatments plant allow
the removal of polluants, usually poorly
biodegradable, present in the water, through the
addition of chemicals. These additives, commonly
called "reagents", in some pH conditions, react with
the pollutants, making them insoluble and favoring
their abatement by coagulation, precipitation and or
neutralization.
STA designs, build and offers a big choice of
technologies and solutions, the aim is providing the
optimal solutions from a technical and operational
point of view, ensuring the achievement of
purification results at the lowest cost. The project
and design of the treatment steps of a
chemical-physical plant and the suited technology to
particular needs is chosen according to the
chemical-physical characteristics of the wastewater,
as well as the choice of the chemical reagents, their
dosages and the reaction times are the most important
parameter in order to obtain an efficient chemical
purification system. A chemical-physical plant can
generally be divided into the following treatment
stages:
-
Insolubilization of metal salts in basic solution;
- Flocculation;
- Coagulation;
- Sedimentation / decantation;
- Neutralization;
- Final filtration of purified water;
- Dehydration and sludge disposal.
In the first step the goal is to increase pH to a
defined value, to make insoluble salts of metal
earlier present in dissolved form, turning into metal
hydrates.The following dosage of specific reagents
allowes the flocculation of suspended particles with
the substance and the formation of flakes.In order to
obtain a better settle we add to the effluent a
polyelectrolyte that determin the coagulation of the
flakes.
In the final separation section the aim is the water
clarification and sludge separation, that settles on
the bottom of the decanter. The clarified water are
sent to a neutralization tank and then to the final
treatment as the physical filtration process on quartz
/ activated carbon.
The sludge are collected from the bottom of the
decanter, dehydrated and finally disposed.
The reactions take place sequentially in distinct
tanks dimensioned to ensure the right contact times,
or in a sequencing reactor with intermittent cycle, a
"batch", that incorporates the different steps of
treatment in a single basin.
The service of the company is always ready to
intervene to guarantee safety, competence and
efficacy. STA offers varied and customized formulas
with one fundamental objective: provide to the
customer a package that combines maximum reliability
with lower operating costs, the rapidity of speech
with the accuracy of performance, the user will be
free by the tasks and issues that it is more
appropriate to entrust to specialists.