Wastewater treatment: from collection to purification

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Have you ever wondered what processes the water undergoes to be clean, free of pollutants?

This article explains all the phases of wastewater treatment, carry out thanks to the sewer networks and purification plants, whose treatments allow to reintroduce unpolluted water into nature .

You should also know that wastewater treatment is the 4th step of the integrate water cycle .

Having clarify this, let’s try to understand what water purification exactly is.

What is water purification?

The dell purification ‘ water is a process that occurs spontaneously in nature, but its effectiveness is impaired by the considerable increase in the consumption of water and the consequent increase in the quantities of wastewater discharge that come from civil and industrial settlements.

The resulting lack of natural balance is restore with the construction of sewage networks and purification plants, which guarantee the return of unpolluted treat water to the environment.

Each purification plant is built on the basis of the population connect to the sewer network serving the plant itself, and is more or less complex in the various sections, also depending on the type of users for whom the purification service is carry out, i.e. homes domestic and/or productive and industrial activities.

Let us see how it works together with the purification process in its individual phases, keeping in mind that purifying means to reduce to the maximum the polluting load that comes out together with the water from homes and businesses.

All stages of the purification process

The wastewater , that is, those that come out of homes or production activities, are collect by the sewer network and convey to the purification plant through pipes. Once they arrive at the plant, they are send to the various treatment stages through the so-call lifting 

(1). The first treatments of a purifier are screening

 (2), which removes the coarse material (pieces of plastic or wood, hygiene products, paper, stones and much more) and sandblasting / de- oiling

 (3), which takes place the separation of the sands by sedimentation, and, as a result, oils and fats are made to rise to the surface.

Subsequently, the water flows into the primary sedimentation tank 

(4), where the separation by the gravity of the sedimentable material define as mud takes place, which accumulates on the bottom of the tank, from where it is then collect and withdrawn to be sent for subsequent treatments.

The treatment of the biological material takes place in the activate sludge tank 

(5): the process is base on the metabolic action of bacterial microorganisms, which use the organic substances and oxygen dissolve in the sewage for their activity and reproduction, with the formation of flakes of sludge that can easily be remove during the sedimentation phase.

In the event that the sewage effluent to the plant is unbalance in terms of nutrients, upstream of the biological basin, it may be necessary to integrate the flow with the dosage of a specific chemical product

(6), which allows to compensate for the qualitative deficiencies of the wastewater .

The separation of the sludge flakes is obtain in the secondary sedimentation tank (7), on the bottom of which the sludge is collect. Part of the activate sludge is recirculate.

(9) in the activate sludge tank, while the excess part is send to the following treatment, i.e. the sludge treatment section, which works in parallel to the water treatment section.

Water drain output from the final sedimentation can now be define as clean, devoid of pollutants, and can therefore be return to the surface watercourse (8).

The one just describe is the basic process for the treatment of wastewater, before it can be reintroduce into nature with the utmost respect for the territory and the environment.

Each manage area benefits from the service provide by a purification plant, whose functions and dimensions vary according to the inhabitants.

Casolino arezzo purifier

The Industrad Acque purifiers

The Casolino purifier is the main plant manage by Industrad Acque, where it is also possible to put into practice a further action of environmental protection thanks to the presence of the dryer , which reduces the volume of sludge deriving from purification, thus allowing its transfer. more sustainable towards their recovery and disposal.

In the case of rural areas, then, for about ten years, Industrad Acque has also given life to a greener version of purification with phyto- purifiers , which make use of the self-purifying capacity of plants typical of wet areas, as happens in Ponte Buriano, at the gates of Arezzo, where the plant is locate right inside the homonymous Nature Reserve, combining the treatment of the resource with the utmost respect for the area where the treatment takes place.



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Wednesday, 10th August 2022
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