FRUIT CANNING WASTEWATER
ECONOMICAL, LOW MAINTENANCEEliminate expensive chemical neutralisation - Affordable algae and bacteria replace the necessity for chemicals (such as lime or caustic)
PROJECT DECIDUOUS FRUIT, SA
WATER RECOVERY, IRRIGATIONEnables water recovery which also contribute towards the economical advantages. Treating 3500m3/day of wastewater towards irrigation standard.
The Algal Integrated Ponding System is not only economical and effective but also provides attractive and nuisance-free operation with low maintenance and operational costs.
The biggest challenge was to design a system to treat fruit processing wastewater that could neutralise the acidic wastewater without using chemicals (such as lime or caustic) – this was achieved by implementing an HRAP (High Rate Algal Pond) which is a shallow pond allowing natural algae to grow at a high rate; these algae increase the alkalinity of the water, and this alkaline water is then blended with the acidic-fruit-canning-wastewater to effectively neutralise the acidity in the ponding system. This HRAP has a surface area of 2,500 m2 and to date is the largest of its kind in South Africa
This is a passive method of treating fruit processing wastewater and alternative to electrical mechanical aeration
Water Recovery: The single most important advantage
Treating two separate fruit canning waste streams: 200 m3/day of saline water towards total evaporation and 3500 m3/day of organic wastewater towards irrigation standard.