Banca de DEFESA: AGNES ADAM DUARTE PINHEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : AGNES ADAM DUARTE PINHEIRO
DATE: 23/02/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Engenharia Civil
TITLE:

Anaerobic Codigestion of Algae Biomass and Vinasse for Methane Production

KEY WORDS:

Anaerobic codigestion. Algal biomass. Sugarcane vinasse. Methane

PAGES: 82
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Microalgae are a promising substrate for energy recovery through methane production via anaerobic digestion. However, the resistance to hydrolysis due to the composition of the cell wall, and consequently the low carbon ratio (C/N) is considered one of the main limiting factors of its biodegradability. In this sense, to improve the C/N ratio and the biodegradability of algal biomass (BA), sugarcane vinasse (V) as a cosubstrate for anaerobic codigestion, aiming at an increase in methane (CH4) yield. Thus, tests of the biochemical methane potential (BMP) were carried out, designed to verify whether the mixture provided better stability and yield conditions. The co-digestion of the substrates provided a 120% increase in the CH4 yield and a 12% increase in the synergistic effect in relation to that obtained in the anaerobic digestion of algal biomass. From the BMP tests, the scaling of the co-digestion process was tested in a two-stage reactor system, an acidogenic reactor (RA) that had HRT and OLR of 4 days and 5.26 kg. m-3. d-1, and a methanogenic reactor with HRT and OLR of 22 days and 0.26 kg. m-3. d-1, respectively. In the two-stage reactors, three distinct phases were analyzed in an operational period of 270 days, anaerobic digestion of vinasse (Phase I), anaerobic co-digestion of V and BA (Phase II) and anaerobic co-digestion of V and pre-treated BA (Phase III). The addition of algal biomass, Phase II, provided an average VFA production of 4858.38 mg. L-1, higher concentrations achieved between the three phases. Biomass pre-treatment resulted in higher methane production in the RM during Phase III, with maximum values of 342 NmL CH4.gCOD-1ad, and average yield of 178 ± 66 NmL CH4.gCOD-1ad. Co-digestion with vinasse provided greater nutritional balance, and phase separation favored the formation of VFA and its conversion to methane. The pre-treatment of the biomass boosted the methanogenic reactions since the highest methane productions were obtained in this situation.

COMMITTEE MEMBERS:
Externo à Instituição - JORGE MANUEL RODRIGUES TAVARES
Externo ao Programa - 3141471 - FABRICIO MOTTERAN - nullPresidente - 1278948 - MARIA DO CARMO MARTINS SOBRAL