recyclage des eaux usées traitées grâce aux ultraviolets station d'épuration M'Zar à Agadir au Maroc

Reuse of treated wastewater: the M’Zar wastewater treatment plant in Morocco

Treated wastewater reuse is a widespread practice in regions of the world affected by water scarcity, particularly for crop and landscape irrigation.

In Morocco, for example, water resources are limited and unevenly distributed. Agadir, in the south of the country, is located in a region known for its semi-arid climate and a large water deficit in both surface and groundwater. However, this Moroccan seaside city mainly depends on tourism, agriculture and fishing. Treated wastewater reuse is therefore essential to conserve water resources, avoid environmental degradation in areas receiving reused wastewater, and ensure the safety and public health of tourists and residents.

This observation led Agadir’s independent multi-service agency (RAMSA) to launch a project to recycle wastewater from the M'zar wastewater treatment plant to irrigate the golf courses and green spaces of Greater Agadir. This outstanding project is supported by Sovereign decree and the High Council for Water and Climate.

recyclage des eaux usées traitées REUT Station d'épuration M'Zar à Agadir au Maroc

RAMSA is committed to sustainable development through wastewater reuse;

RAMSA manages water and sanitation services in the cities of Agadir, Dcheira, Inezgane, Aït Melloul and the rural commune of Aourir.

In early 2000, this public agency sought to launch a major sanitation, purification and exploitation project for the M'zar wastewater treatment plant (WWTP) in Greater Agadir. Built in 2002 on the site of the M'zar dunes in the Souss-Massa National Park, the M'zar WWTP receives all the wastewater produced by the cities of Inezgane, Dcheira, Aït Melloul and Tikiouine and 70% of the wastewater from Agadir.

This project, which takes into account the technical and environmental priorities required at the national and international levels, aims to:

  • Eliminate pollution in the Oued Sous, the Moroccan river that flows into the Atlantic, a few kilometres south of Agadir,
  • Improve the quality of water in the Bay of Agadir by eliminating direct untreated discharge to bring the water into conformity with category A requirements under Moroccan legislation and thus ensure the sustainability of the seaside tourism sector,
  • Contribute to protecting the agglomeration against flooding,
  • Mobilize a constant water resource by reusing treated wastewater to irrigate the city’s golf courses and green spaces. Indeed, a feasibility study showed that the M'zar WWTP could meet the golf course’s water demand of approximately 28,000 m3 per day.

The benefits of reusing treated wastewater

The water table in the Souss Massa region is falling by around two to three metres per year due to high temperatures and low rainfall. This drop in the water supply means that increased water demand due to rising agricultural production or population needs, cannot be met.

Reusing wastewater could significantly reduce the water deficit and conserve drinking water resources, while also enabling substantial economic gains in terms of soil nutrients, particularly nitrogen, phosphorus and potassium, which are essential for healthy crop growth.

Implementing a tertiary treatment to irrigate the ocean golf course

Wastewater is full of different substances from domestic use and commercial and industrial activities. Because it contains various microorganisms (pathogenic bacteria, enteric viruses, parasites, etc.), wastewater pollutes the environments into which it is discharged, which can be harmful to both local wildlife and human health.

REUT recyclage des eaux usées traitées agadir MarocREUT recyclage des eaux usées traitées agadir MarocIn order to comply with health and environmental requirements, RAMSA plans to equip the M'zar WWTP with an ultraviolet water disinfection system.
The objective is to achieve a 2-log bacteriological reduction in faecal coliforms (i.e. < 200 CFU/100 ml), E. Coli, faecal streptococci and Cryptosporidium, as well as a total absence of nematodes. Once free of all pathogenic microorganisms, the treated wastewater will first be used to irrigate one of Agadir's golf courses, the Ocean Golf, and later all the city’s golf courses and green spaces.

Ultraviolet water disinfection: the expertise of a world-renowned leaderr

recyclage des eaux usées traitées REUT step agadir Maroc traitement ultraviolets For more than 20 years, BIO-UV Group has been offering its expertise in ultraviolet water disinfection to professionals around the world. UV disinfection consists in using a reactor to reproduce UV-C radiation similar to the rays emitted by the sun, but at a higher intensity. At a specific wavelength, these rays attack the cells of microorganisms and stop the DNA replication process, thus rendering them inactive. This process does not affect the bacteriological characteristics of the water.

recyclage des eaux usées traitées REUT step agadir Maroc traitement ultraviolets To meet RAMSA’s needs, the company has set up six low-pressure UV reactors equipped with 14 UV lamps each. Our reactors, which are perfectly adapted to the installation, operation and maintenance constraints specific to each project, thus allow the treated wastewater to be used to irrigate green spaces and golf courses while protecting the environment downstream from the WWTP discharge. The water is treated continuously in closed reactors, where the water passes between lamps that irradiate the fluid in a few seconds without addition of any chemicals.

Since August 2010, the Ocean Golf has been irrigated by UV-treated water from the M'zar WWTP with an average flow rate of 30,000 m3 per day. The BIO-UV reactors that have been installed have proven to be effective. Indeed, results of analyses carried out by the IBN SINA biological control laboratory in Marrakech showed that the presence of faecal coliforms in water are below 100 CFU/100 ml!