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Nutrient and pathogen removal from anaerobically treated black water by microalgae
Nathalie Dyane Miranda Slompo1, Larissa Quartaroli2, Tânia Vasconcelos Fernandes3
1Department of Hydraulics and Sanitation, University of São Paulo (EESC-USP), São Carlos, São Paulo, Brazil.
Journal of Environmental Management
|June 9, 2020
Summary
Microalgae efficiently removed nutrients and pathogens from blackwater wastewater. This sustainable photobioreactor process recovered carbon and produced algal biomass, offering a cost-effective waste valorization solution.
Area of Science:
- Environmental biotechnology
- Microalgal cultivation
- Wastewater treatment
Background:
- Growing demand for sustainable waste stream valorization.
- Wastewater presents a viable source for carbon and nutrient recovery.
- Microalgae offer a promising solution for resource recovery from waste.
Purpose of the Study:
- To evaluate nutrient and pathogen removal from blackwater using Chlorella sorokiniana in photobioreactors (PBRs).
- To assess microalgal consumption of carbon sources like bicarbonate and volatile fatty acids.
- To determine biomass production and cost-effectiveness of the PBR system.
Main Methods:
- Anaerobically treated blackwater was used as feedstock in flat-panel PBRs.
- Chlorella sorokiniana was inoculated for nutrient and carbon source consumption.
- Nutrient removal (N, P), pathogen inactivation, and biomass growth were quantified.
Main Results:
- Achieved 66% nitrogen and 74% phosphorus removal.
- Observed high consumption of alkalinity (83%) and volatile organic acids (76%).
- Produced 73 mg L-1 day-1 biomass and inactivated E. coli by 2.73 log.
Conclusions:
- Flat-panel PBRs without CO2 supplementation are effective for nutrient recovery and biomass production.
- The process demonstrates a cost-effective and sustainable method for wastewater valorization.
- Microalgal cultivation in PBRs offers a dual benefit of waste treatment and resource generation.
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