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Saturday, April 13, 2024

The different systems and technologies for treating industrial wastewater

Environmental protection is at the heart of current concerns, at all scales. Wastewater treatment is one of the most effective measures for preserving natural resources. Industrial activities are the main factor of water pollution. Specialized brands like Air Liquide continue to develop different systems and technologies to treat industrial effluent.

Regulations concerning the treatment of industrial effluents

Industrial effluents have a significant impact on the environment. To reduce and prevent harmful effects, the discharge of industrial wastewater is subject to strict control according to the ministerial decree of February 2, 1998.

Manufacturers are notably required to treat wastewater before rejecting it or reintegrating it into a specific circuit.

In this sense, they can opt for:

  • the discharge of industrial effluents into the natural environment after classic and complete purification within an autonomous station installed on their site;
  • the discharge of industrial effluents into the natural environment following pre-treatment at a station located within their site then primary treatment, secondary treatment and, if necessary, tertiary treatment, carried out within a station collective purification;
  • direct spreading of industrial effluents on agricultural soils: this option concerns in particular pre-treated wastewater, which has not yet been cleared of organic matter.

The water purification system

The classic water purification technique is applied at collective industrial and urban treatment stations.

This method is done in four steps, including:

Pre-treatment

Wastewater is filtered to remove solid waste. This step is done in three phases, namely:

  • screening and sieving to remove insoluble waste such as plastic objects;
  • desanding;
  • degreasing to rid the water of oily substances.

Primary treatment

This step aims to remove suspended matter by decantation.

Secondary treatment

Secondary treatment is the most important step in the circuit, aimed at eliminating bacteria and other organic matter.

There are two secondary treatment processes for industrial effluents, namely:

Physico-chemical treatment

This operation aims to group the particles and waste present in industrial wastewater which are then eliminated by decantation or using a dissolved air float.

This method involves the use of chemical compounds and is therefore quite expensive.

Biological treatment

Manufacturers can use different methods of water purification by biological treatment using essentially CO2, the most common and most effective of which are:

  • the technique using mud composed of earth, organic matter and reinforced with carbon dioxide. Decantation is necessary at the end of this first step to completely purify the water;
  • the treatment process by neutralizing PH by injecting carbon dioxide into the water.

These methods are completely based on biological mechanisms involving the use of completely natural substances. Biological treatment then has the advantage of being less expensive, 100% ecological and adapts to all types of wastewater and all sectors of activity.

Tertiary treatment

Tertiary treatment is not obligatory. This process is reserved for industrial effluents intended to be reintegrated into a sensitive environment.

This step makes it possible to reinforce the results of previous treatments, and, thus, to eliminate as much suspended matter, and particles from chemical substances and organic matter as possible.

Ghulam Muhammad
Ghulam Muhammadhttps://www.juibd.com/
Hello, I'm Ghulam Muhammad, an experienced articles writer with expertise in on-page SEO optimization. I offer high-quality content creation services tailored to meet your needs. With a passion for crafting engaging articles, I strive to deliver captivating content that resonates with your audience. Your satisfaction is my priority, and I am committed to providing you with exceptional articles that exceed your expectations. Thank you for your support!

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