On 29 August 2026, Fanack Water published a regional feature arguing that managed aquifer recharge (MAR) is moving from flagship projects to routine infrastructure across the Middle East and North Africa, with Abu Dhabi's Al Dhafra scheme cited as the largest desalinated-water MAR project anywhere in operation Fanack Water.
Key takeaways
- Abu Dhabi already treats more than a million cubic metres of wastewater a day and is targeting full reuse Fanack Water.
- The Liwa strategic water storage and recovery scheme holds around 26 million cubic metres of desalinated water in a shallow sand aquifer under the Al Dhafra dunes Fanack Water.
- The Liwa scheme uses an infiltration basin and a wellfield of around 315 recovery wells, with multi-level observation wells and automated monitoring Fanack Water.
- The reported cost of the Liwa project is roughly USD 350 million Fanack Water.
- In Muscat, roughly 30 per cent of treated effluent has historically been discharged to lagoons or the sea for lack of demand Fanack Water.
What happened: Abu Dhabi puts treated wastewater and desalinated surplus underground
The article frames managed aquifer recharge as a way to link three underused water streams in the region: surplus desalinated water from plants that run most efficiently at a steady rate, treated wastewater that has no current customer, and flash-flood pulses that normally run to the sea Fanack Water. For Abu Dhabi specifically, the feature says the emirate "now treats more than a million cubic metres a day and is targeting full reuse," which the article uses to justify pushing treated effluent into aquifers after suitable polishing Fanack Water.
The headline project is the Liwa scheme in the Al Dhafra region, completed in 2017 after a pilot that began in 2005, which the article describes as the largest example of desalinated-water MAR anywhere Fanack Water. The scheme stores around 26 million cubic metres in a shallow sand aquifer, enough to supply the emirate for up to 90 days in an emergency, and is reported at a cost of roughly USD 350 million Fanack Water. Recharge is done through an infiltration basin, with a wellfield of about 315 recovery wells, multi-level observation wells and automated monitoring to track the stored water body Fanack Water.
The article notes that the same logic is now being applied to treated wastewater, not just desalinated water: recharging aquifers with reclaimed effluent offers a year-round outlet and adds "an extra stage of natural purification as it moves through the soil, a process known as soil-aquifer treatment" Fanack Water. Dubai's parallel ASR project for desalinated water, designed to hold the equivalent of about 27 million cubic metres and release 50 million imperial gallons a day for 90 days, is cited as confirmation that the model is spreading along the Gulf coast Fanack Water.
What it means for operators and buyers: the specification read
Putting the headline figure in buyer units: 26 million cubic metres of stored water, plus a 90-day emergency supply, lines up with an average draw of roughly 290,000 m³/day, which is well within the daily treated volume of more than 1,000,000 m³/day that Abu Dhabi already handles, so the storage layer is sized as a strategic reserve, not a daily buffer Fanack Water. The 315 recovery wells over that 26 Mm³ envelope imply a well density on the order of one well per 80,000–100,000 m³ of stored water (general industry range, not from the sources), which is the kind of figure a procurement team will see in wellfield layout drawings.
The treatment train implied by the article is the standard municipal reuse sequence – screening, primary clarification, biological treatment such as MBR or MBBR, tertiary filtration, and disinfection – followed by an additional polishing step: soil-aquifer treatment (SAT) as the water passes through the unsaturated zone into the sand aquifer, with the recovery wells acting as the final abstraction point Fanack Water. For a buyer, the practical shift is that the aquifer itself becomes a process unit, with infiltration basin hydraulics, residence time and recovery well design replacing part of the conventional tertiary pipework. Buyers evaluating reuse trains for inland or coastal sites in the Gulf should weigh SAT against membrane-based tertiary steps, and look at how municipal reuse schemes are being specified for the region. Equipment and monitoring packages for the polishing, recovery and observation well network sit within the water purification scope already supplied to municipal utilities, and the industries served by such packages include both municipal wastewater and industrial reuse clients.
If your plant looks like a coastal or inland reuse facility in the 100,000–500,000 m³/day range discharging to a desert or sandy aquifer, treating municipal sewage with BOD in the typical 200–350 mg/L range and looking for a year-round reuse outlet that meets aquifer recharge consent limits, this event signals that soil-aquifer treatment plus a recovery wellfield is being specified at the megaproject end of the market and is likely to show up in tender documents across the Gulf over the next planning cycle (general industry range, not from the sources).
FAQ
What is the storage capacity of the Abu Dhabi Al Dhafra aquifer scheme, and how is it sized?
It holds around 26 million cubic metres of desalinated water in a shallow sand aquifer under the Liwa dunes, with the article reporting enough supply for up to 90 days in an emergency Fanack Water. Inflow is through an infiltration basin and abstraction through around 315 recovery wells Fanack Water.
How much of Abu Dhabi's treated wastewater is now being put back into aquifers?
The article reports that Abu Dhabi treats more than a million cubic metres a day and is targeting full reuse, with aquifer recharge named as one of the outlets once the water has been suitably treated Fanack Water. It does not give a percentage of effluent currently sent to MAR.
What is soil-aquifer treatment and where does it sit in a reuse train?
Soil-aquifer treatment is the natural polishing step that occurs when recharged water moves through the unsaturated zone into the aquifer, providing "an extra stage of natural purification" before the water is recovered Fanack Water. In a reuse plant it sits after conventional biological and tertiary treatment and before the recovery well, effectively replacing or reducing the load on a membrane or advanced oxidation polishing stage (general industry range, not from the sources).
What is the reported cost of the Liwa strategic storage scheme?
The reported cost is roughly USD 350 million for the Liwa project, which was completed in 2017 after a pilot that started in 2005 Fanack Water. For a buyer, the comparable line items are land, wellfield drilling, pumps, infiltration basin civil works and the SCADA layer for the multi-level observation wells.
