What is REUSE?

REUT or reuse of treated wastewater is the reduction of the withdrawal pressure on water resources. Countries with drought problems make extensive use of this technique.

In France, a study shows that we are at 0.4% of treated water reused, especially in the north. And among the applications of these waters, we cite:

  • First of all, the water from the rain;
  • then the water on the surface;
  • mine and quarry wastewater;
  • And finally industrial wastewater (even if it is subject to different regulations).
REUSE raised 1h2o3 description

What is the use of a filter in this process?

Industrial wastewater treatment uses a filter that is easily integrated into the treatment of a wastewater treatment plant. This will reduce any impurities and suspended solids in the waters, suitable for REUTs and its role is the same as a pond.
It provides mechanical filtration adapted to water production and rids particles larger than the diameter of the meshes.

For a REUT, an optimised wash filter is ideal for highly concentrated sludge with less water saturation. This filtering reduces water consumption to a minimum. However, the difference with aquaponics is that the sludge used will not be systematically mineralized. This is because the filter coupled with another filtering system such as an MBBR will provide biological filtration.

What are the different applications?

The different applications depend on the country and the standards in force, often very strict, to avoid any risk of contamination. Nevertheless, here are some applications of REUSE:

  • Plant cooling;
  • The supply of water to the boilers;
  • agricultural irrigation;
  • Use of water for industrial treatment;
  • Watering lawns and green spaces;
  • Use in public fountains and street cleaning.

FAQ

What is REUT (reuse of treated wastewater)?

REUT consists of recovering wastewater after treatment to reuse them for other non-potable purposes. It aims to Reducing pressure on water resources, especially in drought-affected areas. In France, the REUT is still marginal (0.4%), but it is developing in sectors such as agriculture, industry, or public spaces (cleaning, watering, fountains).

The drum filter is essential for removing suspended solids before water reuse. It ensures a fine mechanical filtration, reducing the risk of clogging and preparing the water for additional biological treatment (e.g. via an MBBR). It also makes it possible to produce concentrated sludge with little water, thus optimizing consumption and overall system performance.

Treated wastewater can be reused for:

  • industrial cooling,

  • boiler feeding,

  • agricultural irrigation,

  • watering of green spaces,

  • street cleaning,

or public fountains.
 Applications vary according to local standards and health requirements, which are particularly strict in Europe.

Yes, but under strict conditions. The use of treated water for irrigation is permitted in certain cases, subject to compliance with health standards defined by the prefectural decrees and regular monitoring of water quality. Drum filters play a key role in ensuring this quality, removing unwanted particles during pre-treatment.

REUT aims to recover water for industrial or agricultural uses, while aquaponics is a closed ecosystem combining fish and plants. In REUT, sludge is not always mineralized and must be managed differently. Mechanical filtration (such as with a drum filter) is common to both, but in aquaponics it is usually followed by filtration dedicated to the mineralization of waste.

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