Bio-CH 4 yield of swine manure and food waste optimized by co-substrate proportions diluted in domestic sewage and pH interactions using the response surface approach.

Autor: Camargo FP; Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. Trabalhador São Carlense, 400, 13566-590, São Carlos, SP, Brazil., Lourenço V; Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. Trabalhador São Carlense, 400, 13566-590, São Carlos, SP, Brazil., Rodrigues CV; Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. Trabalhador São Carlense, 400, 13566-590, São Carlos, SP, Brazil., Sabatini CA; Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. Trabalhador São Carlense, 400, 13566-590, São Carlos, SP, Brazil., Adorno MAT; Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. Trabalhador São Carlense, 400, 13566-590, São Carlos, SP, Brazil., Silva EL; Department of Chemical Engineering, Federal University of São Carlos, Rod Washington Luiz, Km 235, SP 310, 13565-905, São Carlos, SP, Brazil., Varesche MBA; Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. Trabalhador São Carlense, 400, 13566-590, São Carlos, SP, Brazil. Electronic address: varesche@sc.usp.br.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2023 Dec 15; Vol. 348, pp. 119308. Date of Electronic Publication: 2023 Oct 24.
DOI: 10.1016/j.jenvman.2023.119308
Abstrakt: This research aimed at evaluating optimal conditions to obtain value-added metabolites, such as bio-CH 4 , by co-digesting swine manure and food waste diluted in domestic sewage. The assays were carried out in batches using the statistical methods of Rotational Central Composite Design (RCCD) and Surface Response to evaluate the ranges of food waste (1.30-9.70 gTS.L -1 ), pH (6.16-7.84) and granular Upflow Anaerobic Sludge Blanket sludge as inoculum (2.32-5.68 gTS.L -1 ), besides about 250 mL of swine manure in 500 mL Duran flasks. According to the RCCD matrix, bio-CH 4 yields among 600.6 ± 60.1 and 2790.0 ± 112.0 mL CH 4 gTS.L -1 were observed, besides the maximum CH 4 production rate between 0.4 ± 0.5 and 49.7 ± 2.0 mL CH 4 h -1 and λ between ≤0.0 and 299.3 ± 4.5 h. In the validation assay, the optimal conditions of 9.98 gTS.L -1 of food waste, pH adjusted to 8.0 and 2.20 gTS.L -1 of inoculum were considered, and the bio-CH 4 yield obtained (5640.79 ± 242.98 mL CH 4 gTS.L -1 or also 5201.83 ± 224.07 mL CH 4 gTVS.L -1 ) was 11.3 times higher than in assays before optimization (499.3 ± 16.0 mL CH 4 gTS.L -1 ) with 5 gTS.L -1 of food waste, 3 gTS.L -1 of inoculum and pH 7.0. Besides, the results observed about the energetic balance of the control and validation assays highlight the importance of process optimization, as this condition was the only one with energy supply higher than the energy required for its operation, exceeding max consumption sevenfold. Based on the most dominant microorganisms (Methanosaeta, 31.06%) and the metabolic inference of the validation assay, it could be inferred that the acetoclastic methanogenesis was the predominant pathway to CH 4 production.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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