Banca de DEFESA: ELISSANDRA CHEU PEREIRA DO NASCIMENTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELISSANDRA CHEU PEREIRA DO NASCIMENTO
DATE: 17/02/2022
TIME: 14:00
LOCAL: Auditório Pós-Graduação em Engenharia Civil on line
TITLE:

Recovery of Biopolymers from Aerobic Granular Sludge and Algal-Bacterial Granular Consortium

KEY WORDS:

Resource recovery; Aerobic and algal-bacterial granular sludge; Alginate-like exopolymer (ALE); Polyhydroxyalkanoate (PHA); Lipid production.

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The management of surplus biological sludge produced in wastewater treatment plants can account for more than 50% of the operating costs of an ETE. In this context, the inadequate disposal of this residue in dumps and controlled sanitary landfills is considered an environmental problem that is harmful to the environment and public health. In this sense, should be prioritized the search for new technologies for the recovery of this residue. Considering this scenario, this research had four objectives aiming to deepen the knowledge regarding the valorization of sludge through aerobic granular sludge (LGA) and algal-bacterial sludge (LGAB) technology: (1) to analyze the formation of granules and photogranules aerobics; (2) quantify the recovery of biopolymers (ALE and PHB) in LGA and LGAB systems, as well as lipid production in LGAB; (3) to evaluate the operation mode in the recovery of ALE, PHB and Lipids in the reactors and (4) To characterize the microbiological community in the LGA. For this purpose,  four reactors were operated in successive batches at a laboratorial scale, two reactors with bacterial biomass (R1 and R2) and two bioreactors with microalgal-bacterial consortium (F1 and F2) with cycles of 4 hours, during 70 days. The reactors were subjected to two operational configurations of biomass mixing the following: air pulses (R1 and F1) and supernatant recirculation (R2 and F2). The reactors were fed with complex synthetic effluent (280.82 ± 53.56 mg/L of organic matter) at a temperature of 23.5 ± 1.1 °C). In this study, it was observed that the configuration of biomass mixing by air pulses favored the production and recovery of ALE for both bacterial biomass (704.9 ± 71.6 mg VSALE / g VSEPS) and algal-bacterial biomass (686, 3 ± 186.3 mg VSALE / g VSEPS). Based on the analysis, it was observed that the organisms of the genus Lactococcus, responsible for the production of EPS, dominated in the bacterial reactors, accounting for more than 40% of the microbial population. Regarding PHB recovery, it was observed that bacterial reactors produced about 2 (two) times more PHB compared with algal-bacterial biomass reactors (11.95± 2.2 mgPHB/gSST for R1 and 11.3± 0 .65 for R2). Finally, lipid production was achieved in F1 and F2, which reached about 18.5% and 27.0%, respectively. Based on the data, it was possible to verify the potential for recovery of biopolymers (ALE and PHB) in LGA and LGAB and for lipid production in LGAB. However, it is necessary to apply the process at pilot scale and/or on a real scale to evaluate its applicability and economic and operational feasibility for implementation in biorefineries.

BANKING MEMBERS:
Externa à Instituição - LORENA BITTENCOURT GUIMARÃES THIBAU
Presidente - 3133998 - BRUNA SCANDOLARA MAGNUS
Externo ao Programa - 3141471 - FABRICIO MOTTERAN
Externo à Instituição - OSMAR LUIZ MOREIRA PEREIRA FONSECA DE MENEZES