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Growth of Desmodesmus subspicatus green microalgae and nutrient removal from sugarcane vinasse clarified by electrocoagulation using aluminum or iron electrodes
Cultivo de la microalga verde Desmodesmus subspicatus y remoción de nutrientes de vinaza de caña de azúcar clarificada por electrocoagulación usando electrodos de aluminio o hierro
Palabras clave:
distillery effluent, mixotrophic growth, wastewater treatment (en)efluente de destilaría, cultivo mixotrófico, tratamiento de aguas residuales (es)
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Sugarcane ethanol production generates considerable quantities of vinasse, its main wastewater. Microalgae cultivation is a promising option for effluent remediation, since the generated biomass can be feedstock for biofuel and bio-based chemical production. Due to vinasse high turbidity, pretreatment is necessary to clarify this effluent, adapting it as a mixotrophic culture medium. In this context, the present research evaluated the integrated process of electrocoagulation (EC) of sugarcane vinasse with aluminum or iron electrodes and subsequent cultivation of green microalgae Desmodesmus subspicatus. Results indicate pH neutralization and high turbidity removal efficiency by EC with both electrode materials. Aluminum EC and subsequent microalgae cultivation removed 66 and 75% of initial total organic carbon and total nitrogen, respectively, with biomass productivity of 1.45 g L-1day-1 and maximum specific growth rate of 0.095 h-1. Microalgae productivity was inferior in vinasse pretreated by iron EC, suggesting possible interference of ferric compounds in the microalgal development.
La producción de etanol a partir de caña de azúcar genera cantidades considerables de vinaza, su principal agua residual. El cultivo de microalgas es una opción prometedora para su tratamiento, sin embargo es necesaria una clarificación previa. En este contexto, la presente investigación evaluó el proceso de electrocoagulación (EC) de vinaza de caña de azúcar con electrodos de aluminio o hierro y el posterior cultivo de la microalga Desmodesmus subspicatus. Los resultados de la EC indican neutralización de pH y alta remoción de turbidez con ambos electrodos. Se removió el 66 y 75% del carbono orgánico y nitrógeno total, respectivamente, con EC usando electrodos de aluminio y posterior cultivo, con productividad de biomasa de 1,45 g L-1día-1 y velocidad específica de crecimiento máxima de 0,095 h-1. El cultivo en vinaza pre-tratada por EC con electrodos de hierro fue afectado negativamente, posiblemente por interferencia de compuestos del metal con la microalga.
Citas
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