Internationally, Veolia was distinguished at the Global Water Awards 2017 for 2 desalination plants:
- Municipal Desalination Plant of the Year – Az Zour North1
- Industrial Desalination Plant of the
Year - Marafiq
Read a summary of these projects here
Multiple Effect Distillation (MED) technology, a low temperature sea water distillation process, is used to evaporate seawater in numerous stages at 70° C or lower. Up to 14 stages can be used to achieve the desired outcome.
Membrane treatment, involves pre-treatment that prevents fouling and scaling using Veolia’s water technologies. These include Actiflo® for clarification, Multiflo™ for enhanced clarification and lamella settling. Spidflo™ is used for flotation and Filtraflo™ for gravitational flow.Reverse osmosis via membrane filtration follows.
Highly pressurised filtration is made through semi-permeable osmotic membranes to reach an osmotic equilibrium, suitable for high and low salinity concentration. The technology used for this process is called Sirion™, a reverse osmosis system developed for pure water production, seawater desalination and water reuse applications. These processes are followed by degassing to ensure a pH adjustment with CO² stripping, which is required for some industrial projects.
Approximately 15% of the world’s desalination plant capacity was designed and constructed by Veolia internationally.
Brackish water desalination
Brackish water desalination solutions from Veolia transform Acid Mine Drainage (AMD) and other less toxic inland water streams with high levels of total dissolved salts into high grade potable water.
There are two processes to treat brackish water: membrane processes and thermal processes, both of which can be done with large scale permanent water treatment plants and containerised package plants.
Containerised Potable Water Treatment Plants from Veolia can be tailored to desalinate both seawater and brackish water
Reverse osmosis (RO) and nanofiltration achieve desalination via membranes.
Multi effect distillation, evaporation and crystallisation are thermal processes to achieve desalinated water.
These technologies are designed to treat industrial or municipal wastewater, seawater, brackish groundwater, surface or potable water.
Another 2 technological processes that are effectively used for desalinating water is multi-stage flash (MSF) and hybrid systems using both thermal and RO.
Selection of the most appropriate solution is determined by the feed water source and the required quality of the treated water.
Less energy intensive than thermal processes, this process is typically for water with a lower dissolved salt content and includes reverse osmosis and nanofiltration.
Membrane separation processes are used for:
- Seawater desalination
- Process and potable water production
- Boiler feedwater and pharmaceutical water polishing and demineralisation
- Process and municipal effluent rehabilitation and recycling
- As part of a ZLD process
Ideally used for water with high dissolved salt content where the pressure needed for a membrane system to achieve equivalent results would be too much. This process reduces energy costs as it uses a low-cost energy source.
Multiple effect desalination MED units (low temperature seawater evaporator) enable multiple effect distillation, of which there are two:
- Multiple Effect Distillation with Thermal Vapour Compression (MED-TVC)
- Multiple Effect Distillation with Mechanical Vapour Compression (MED-MVC)
Chemicals For Desalination
Chemicals for desalination water treatment from Veolia South Africa comprise the Hydrex™ 4000 series, one in Veolia’s range of Hydrex™ chemicals. These specific chemicals for desalination methods optimises membrane processes. Hydrex™ 4000 protects membrane elements by keeping them free of scale and bacteria growth, simultaneously avoiding external elemental degradation through specially formulated chemicals.
Developed for reverse osmosis, nanofiltration and ultrafiltration treatment plants, water treatment chemicals from Veolia South Africa have international membrane suppliers’ approval and are used across Africa.
Desalination and water purification in the mining industry
Veolia’s AMDRO™ technology, a patented technology for desalinating acidic wastewater with high concentrations of metals and calcium salts, was a result of this collaboration.
AMDRO™ combines Veolia’s ACTIFLO® high rate clarification process with filtration, RO and ion exchange to generate high-quality effluent with minimal pre-treatment requirements. This technology is applicable for the phosphate, coal mining and steel industries, as well as general industry for acidic industrial wastewater desalination.
Veolia partners with industry experts to formulate the ideal water treatment solution for a particular industry.
In the mining sector, exploration, engineering and mining companies’ expert opinions are brought into the equation when developing solutions for to treat mine water.
Let us help you build a containerised desalination plant for your requirements. Send us an enquiry TODAY.
Southern African desalination case studies
Small scale desalination plants
A turnkey desalination plant that supplies 10 ML of potable water to the Mossel Bay Municipality, and 5 ML of process water to Petro SA.
A turnkey seawater desalination plant in Plettenberg Bay producing 2 ML of potable water per day.
A turnkey seawater desalination plant that produces 2 ML of potable water per day for Knysna municipality.
A 1,7 ML per day seawater desalination plant in Lamberts Bay that helps alleviate pressure on the region's water system.
An RO desalination plant at Transnet’s iron ore terminal in Saldanha.
To speak to a Veolia expert on desalination solutions, contact us today!
Tailored Operations & Maintenance
Our extensive technical and project management capabilities and aftersales O&M assure our clients of improved operation and minimum lifecycle costs. Tailored O&M contracts from Veolia South Africa ensure all your water-related infrastructure and systems are optimised for maximum performance and compliance, so you can focus on your core business.
Veolia’s Ambitions For Africa
Rapid urbanisation and industrialisation in Africa requires new strategies for water treatment and infrastructure. Veolia South Africa’s Ambitions for Africa project aims to anchor Veolia in Africa through local partnerships, community engagement and tailor-made solutions that meet the continent’s evolving needs for efficient, robust, low-footprint water treatment solutions.