In the heart of the Sekhukhune district in northeastern South Africa, the Council for Scientific and Industrial Research (CSIR) has deployed a biological alternative to conventional wastewater treatment. conventional wastewater treatment. It is a system based on laboratory-grown microalgae that, when introduced into Motetema’s treatment ponds, transforms the purification process without the need for electricity or chemical additives.
How does the microalgae system work?
This model is based on phycoremediation, a technique that uses strains of microalgae selected for their high efficiency in absorbing nutrients such as nitrogen and phosphorus. These algae not only remove these compounds from the water, but also raise the pH and create conditions that reduce the presence of bacteria such as E. coli. The result: a water quality suitable for the environment and with multiple subsequent uses.
Since its implementation, the initiative has shown remarkable results such as a 99% reduction of ammonia, 83% reduction of orthophosphate and 73% reduction of nitrogen, as mentioned by Ecoinventos. In addition, the treated ponds handle a volume of up to 4,500 cubic meters per day, doubling their original capacity without requiring mechanical energy. mechanical energy or highly specialized personnel. This efficiency positions the system as a resilient option in the face of power outages or budget constraints.
Training and replication of the model
The CSIR has not only implemented the technology, but has also trained local operators and documented the process in manuals accessible to other municipalities. This allows for replication in regions with similar challenges, especially in rural areas where infrastructure is limited and health risks are high.
The next step in the project is the integration of fish into the ponds. This final phase will allow control of excess algae and residual pathogens while creating an opportunity for aquaculture aquaculture. In doing so, the system not only improves environmental health, but also brings economic and food value to the community.
This decentralized, low-cost approach redefines wastewater treatment as an opportunity for ecological regeneration and sustainable development.
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Source and photo: CSIR
