title: Enhancement of nutrient removal from swine wastewater digestate coupled to biogas purification by microalgae Scenedesmus spp.
abstract: This work investigated the effects of swine wastewater-derived biogas on microalgae biomass production and nutrient removal rates from piggery wastewater concomitantly with biogas filtration. Photobioreactors with dominant Scenedesmus spp. were prepared using non-sterile digestate and exposed to different photoperiods. In the presence of biogas and autotrophic conditions microalgae yield of 1.1±0.2 g L(-1) (growth rate of 141.8±3.5 mg L(-1) d(-1)) was obtained leading to faster N-NH3 and P-PO4(3-) assimilation rate of 21.2±1.2 and 3.5±2.5 mg L(-1) d(-1), respectively. H2S up to 3000 ppmv was not inhibitory and completely removed. Maximum CO2 assimilation of 219±4.8 mg L(-1) d(-1) was achieved. Biological consumption of CH4 up to 18% v/v was verified. O2 up to 22% v/v was controlled by adding acetate to exacerbate oxygen demand by microorganisms. Microalgae-based wastewater treatment coupled to biogas purification accelerates nutrient removal concomitantly producing valuable biomass and biomethane.
authors.affiliation: Department of Chemical Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil.
authors.forename: Jean Michel
authors.initials: JM
authors.lastname: Prandini
authors.affiliation: EMBRAPA Swine and Poultry, P.O. Box 321, Concórdia, SC 89700-000, Brazil. Electronic address: marcio.busi@embrapa.br.
authors.forename: Márcio Luís Busi
authors.initials: ML
authors.lastname: da Silva
authors.affiliation: Biotechnology and Sciences Program, West University of Santa Catarina, Videira, SC 89560-000, Brazil.
authors.forename: Melissa Paola
authors.initials: MP
authors.lastname: Mezzari
authors.affiliation: Department of Chemical Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil.
authors.forename: Mateus
authors.initials: M
authors.lastname: Pirolli
authors.affiliation: Department of Chemical Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil.
authors.forename: William
authors.initials: W
authors.lastname: Michelon
authors.affiliation: Department of Chemical Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil.
authors.forename: Hugo Moreira
authors.initials: HM
authors.lastname: Soares
mesh_terms: D000641:Ammonia / Q000302:isolation & purification; D000818:Animals; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis*; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D002245:Carbon Dioxide / Q000032:analysis; D005374:Filtration; D006862:Hydrogen Sulfide / Q000032:analysis; D008697:Methane / Q000032:analysis; D058086:Microalgae / Q000254:growth & development / Q000378:metabolism*; D009584:Nitrogen / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D058433:Photobioreactors / Q000382:microbiology; D017440:Photoperiod; D044444:Scenedesmus / Q000254:growth & development / Q000378:metabolism*; D013552:Swine; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000641:Ammonia; D056804:Biofuels; D002245:Carbon Dioxide; D006862:Hydrogen Sulfide; D008697:Methane; D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Biogas purification; Microalgae; Piggery wastewater; Tertiary treatment