COLOURING & LEATHER MAKING
POTENTIAL: ECONOMICAL, LOW MAINTENANCEEnhanced nutrient removal and replacing of expensive chemical neutralisation with affordable rich algae cultures
TANNERY PROCESS WATER
LATENT ADVANTAGE: WASTE BENEFICIATIONBeneficial Spirulina biomass production and harvesting
Evaporation Algal Ponding is an 'eco-wise' effluent treatment technique for tannery process water with notable advantages
Archives: Evaporation Ponds at Leather Tannery in SA
Evaporation ponding cascades with the application of a High Rate Algal Pond (HRAP). The system received 500 m3/day of tannery effluent with a total evaporative surface area of 10 hectares, and HRAP of 2 500 m2.
This is a passive method and alternative to electrical mechanical intervention
The High Rate Algal Ponding System is not only economical but also requires low maintenance and operational costs.
"Algae is potent in the control of odour compounds..."
The tannery wastewater treatment project shown (above and to the left) consisted of evaporation ponding cascades with the application of a High Rate Algal Pond (HRAP). This is essential for effective odour control and treating the presence of heavy metal compounds. This system specifically addressed odour through the cultivation of Spirulina and Dunaliella which in essence forms a layer at the top of the water surface called "photosynthetic oxygen capping". The biological layer isolates and neutralises the odour compounds.
Anti-pollution biological degradation and waste-to-resource conversion: The two most important advantages with high land use as the most notable drawback.
The High Rate Algal Pond utilises sun energy for natural algae to produce oxygen that again causes COD breakdown.
High-value biomass production
Even though spirulina is used in biological odour control, it can be harvested and sold or used as algal biomass.
Spirulina is a natural immune stimulant and contains unique phytochemical compounds with antiviral and anti-inflammatory properties. It may be an important ingredient for sustainable fish feed diets. Alternatively, it may again be applied in soil bioremediation or bioaugmentation. Learn more: Waste recovery into biomass.