Water pre-treatment in wastewater treatment

has. What is water pre-treatment

Water pre-treatment is a process aimed at removing impurities, which can be found in raw water, mainly suspended water. These impurities are of different sizes and natures. They can be found in the form of fine particles of matter, sometimes on the nanoscale, sometimes they are even living organisms.
The objective of this manipulation is to ensure that the population has sufficient water quality, free of industrial pollutants and whose quality does not depend on abiotic factors, such as the weather, or even the seasons.
Water pretreatment is the phase preceding the membrane separation process in wastewater treatment. This way, all risks of obstruction in the pipes are avoided and subsequent treatments are facilitated.

b. What are the wastewater treatment technologies in water pretreatment?

Water pre-treatment technologies are mainly based on the principles of coagulation-flocculation. It is only later in the wastewater treatment process that filtration comes into play.

Coagulation-flocculation is a physico-chemical process aimed at treating wastewater, by ridding it of colloidal particles (small negatively charged particles that have a very small diameter and do not sediment) present in the water.
Coagulation will consist of the addition of metal salts to the water. This will reduce the electronegative character of the particles and thus their repulsive capacity. This way, they will come into contact with each other. Flocculation is the addition of polymers that act as glue between the colloids. Therefore, when they come into contact, the colloids will form aggregates called flocs, which can be easily eliminated afterwards.
This removal of the flocs is done by settling to separate the water from the impurities.
Another process, called reverse osmosis, allows the removal of particles of different sizes, up to the ionic scale.

Of course, the drum filter has its place in water pre-treatment technologies. With its mechanical water treatment system, it is able to carry out the coagulation-flocculation stages. This only applies to particles whose diameter exceeds the pore size of the filter.

c. What are the benefits of using a filter for municipal and industrial wastewater pretreatment?

There are many benefits of using a filter for water pretreatment:

Ensuring a continuous and reliable water supply;
Optimizing the overall life cycle of the plant, thereby reducing costs;
Compliance with required quality standards.

Tertiary treatment

has. What is industrial wastewater treatment?

Typically, wastewater requires purification before it can be discharged into the environment. This is even more true in the case of industrial wastewater treatment, which requires a high quality of purification. To remove contaminants and ensure that industries are fully compliant with regional standards, it is important to have an adequate purification system in place. Furthermore, this type of approach presents a real economic advantage, linked to the reduction of waste treatment costs.

b. What technologies are used for tertiary treatment?

The technologies used for tertiary treatment are extensive and diversified. Evaporation, filtration, clarification, aerobic and anaerobic biological treatment technologies are used. This flexibility is essential in order to meet all requirements. These requirements may come from regulatory standards applied in the territory. They can also be linked to the sector of activity (food industry, automotive, pharmaceutical industry, energy, etc.)

c. Advantages of industrial wastewater treatment with a drum filter?

Municipal and industrial wastewater treatment has the virtue of drastically reducing the overall production of waste, while recycling wastewater, transforming it into clean and reusable water. Therefore, we have:

Reduced water loss, thanks to the fight against pollution;
contaminants which present a risk to the environment which are disposed of ;
a revalorization of mud allows :
- Methane production through methanization;
- recovering fertilizer for agriculture.
waste is treated and its disposal is no longer necessary. As such, this results in considerable savings.
a direct view of the quality of the water, thus making it possible to respect and maintain compliance with the standards of the territory.

FAQ

What is water pretreatment in a wastewater treatment plant?

Pre-treatment is the first step in wastewater treatment. It aims to Remove suspended impurities (solid particles, colloids, microorganisms) to prevent fouling of downstream equipment. It usually precedes finer processes such as ultrafiltration or reverse osmosis. This phase is essential for To guarantee the efficiency and longevity of the overall treatment system.

Can a drum filter be used in water pretreatment?

Yes, a drum filter is very effective in pre-treatment, especially in mechanically retaining larger particles. It perfectly complements physico-chemical processes such as coagulation-flocculation, removing the flocs formed before settling. It also allows you to reduce the load of sludge sent to the next steps and ensure a more stable operation of the membranes or biofilters.

What is the difference between pre-treatment and tertiary wastewater treatment?

Pre-treatment occurs upstream , to remove visible or suspended particles. It aims to Prepare the water at more advanced stages. The Tertiary treatment, on the other hand, is a final step, which purifies the water after biological or physico-chemical treatments, so that it can be discharged into nature or reused. The tertiary can include advanced filtration, UV disinfection, ozonation or reverse osmosis.

What are the advantages of a drum filter in the tertiary treatment of industrial wastewater?

The drum filter allows you to:

Reduce water loss by optimizing final filtration;
Capture residual pollutants, thus protecting the environment;
Concentrate sludge, facilitating its recovery (methanisation, fertilisers);
Ensure regulatory compliance of discharged water;

And reduce the operating costs associated with liquid waste management.

What industries use drum filters for tertiary treatment?

Drum filters are used in many industries:

Food Beverage (for scan and particulate-laden water)
Pharmaceutical (treatment of residual active substances)
Automotive (oil removal, metals)

Energy and chemistry (filtration before regulated discharges)
They enable continuous and reliable mechanical filtration, adapted to the strict quality requirements imposed by regulations.