Sustainable beer production in South-Africa
Turning a wastewater treatment plant into a water resource factory.
BIOTIM® Wastewater treatment
AQUALITY® water recovery plant
Johannesburg, South Africa
Treated wastewater: 6.000 m³/d
Organic load: 25.000 kg COD/d
Recovered/reused water: 1.516 m³/d
Adressing water scarcity
Recovering water and energy
Back in 2008, Waterleau had built the 3 million hectoliter brewery wastewater treatment plant. From its design, the ambition reached further than compliance with discharge regulations. In order to achieve its sustainable production goals, HEINEKEN opted for anaerobic wastewater treatment and biogas recovery.
Each month, the equivalent of 18 Olympic swimming pools of process water is recovered and reused as brewery utilities water.
Anaerobic-aerobic brewery wastewater treatment
Each day, the wastewater treatment plant treats up to 6.000 m³ brewery wastewater with an organic load of 25.000 kg COD. Biogas is recovered from the organic pollution digestion process. An additional aerobic treatment step removes the remaining organic pollution turning the treated wastewater into safe disposable surface water. The anaerobic-aerobic technology train includes the following steps:
- Influent screening
- Balancing tank
- Three parallel UASB anaerobic reactors
- Continuous aeration with clarifier
- Sludge dewatering
- Sand filtration
Water recovery from treated wastewater
The biogas is used to fuel cogeneration units, producing heat and power, limiting the brewery's energy footprint. The water footprint is limited too: part of the wastewater treatment effluent is reclaimed as influent for the water recovery plant. While 4.500 m³/d of the treated wastewater is discharged into the river in compliance with regulations, the remaining part is re-used as influent for the water reclamation plant.
The water recovery process includes the following steps
- UF Ultra-filtration
- RO Reverse Osmosis
- Disinfection (chlorination)
Limiting the brewery's water footprint
By recovering the equivalent of half an Olympic swimming pool each day, the brewery reduces its water intake from the municipal water distribution network. The recovery also adds to the water security for the local community.
With the new water recovery plant, each month, up to 45.000 m³ potable water can be retrieved from the brewery wastewater. Water intake from the water distribution system is cut down by 30% or the equivalent of 18 Olympic swimming pools.
Waterleau and Heineken have been partnering for the protection of water and the environment since 2004. Because every drop counts!
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