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Open AccessFeature PaperArticle

Cyanobacterial Biomass Produced in the Wastewater of the Dairy Industry and Its Evaluation in Anaerobic Co-Digestion with Cattle Manure for Enhanced Methane Production

1
Laboratorio de Biotecnología Microbiana, Facultad de Ciencias Naturales, Universidad de Guayaquil, Guayaquil 471, Ecuador
2
Laboratorio de Química Ambiental, Facultad de Ciencias Naturales, Universidad de Guayaquil, Guayaquil 471, Ecuador
3
Department of Rural and Food Engineering, Universitat Politècnica de València, 46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Processes 2020, 8(10), 1290; https://doi.org/10.3390/pr8101290
Received: 13 September 2020 / Revised: 1 October 2020 / Accepted: 8 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Advances of Biogas and Biofuel Production)
The unique perspective that microalgae biomass presents for bioenergy production is currently being strongly considered. This type of biomass production involves large amounts of nutrients, due to nitrogen and phosphorous fertilizers, which impose production limitations. A viable alternative to fertilizers is wastewater, rich in essential nutrients (carbon, nitrogen, phosphorus, potassium). Therefore, Arthrospira platensis was cultivated in 150 mL photobioreactors with 70% (v/v) with the wastewater from a dairy industry, under a regime of light:dark cycles (12 h:12 h), with an irradiance of 140 μmol m−2 s−1 photon. The discontinuous cultures were inoculated with an average concentration of chlorophyll-a of 13.19 ± 0.19 mg L−1. High biomass productivity was achieved in the cultures with wastewater from the dairy industry (1.1 ± 0.02 g L−1 d−1). This biomass was subjected to thermal and physical treatments, to be used in co-digestion with cattle manure. Co-digestion was carried out in a mesophilic regime (35 °C) with a C: N ratio of 19:1, reaching a high methane yield of 482.54 ± 8.27 mL of CH4 g−1 volatile solids (VS), compared with control (cattle manure). The results demonstrate the effectiveness of the use of cyanobacterial biomass grown in wastewater to obtain bioenergy. View Full-Text
Keywords: anaerobic co-digestion; nutrient removal efficiency; dairy industry; photobioreactor anaerobic co-digestion; nutrient removal efficiency; dairy industry; photobioreactor
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MDPI and ACS Style

Álvarez, X.; Arévalo, O.; Salvador, M.; Mercado, I.; Velázquez-Martí, B. Cyanobacterial Biomass Produced in the Wastewater of the Dairy Industry and Its Evaluation in Anaerobic Co-Digestion with Cattle Manure for Enhanced Methane Production. Processes 2020, 8, 1290.

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