Banca de QUALIFICAÇÃO: RODRIGO ALMERIA RAGIO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : RODRIGO ALMERIA RAGIO
Date: 15/12/2025
TIME: 14:00
LOCAL: UFABC - Online
TITLE:

Novel wastewater treatment layout coupling organic matter pre-concentration and membrane photobioreactor: integration of anaerobic digestion and hydrothermal carbonization for resource recovery, water reuse, and residues valorization

PAGES: 100
BIG AREA: Engenharias
AREA: Engenharia Ambiental
SUBÁREA: Fontes Renováveis de Energia
SPECIALTY: Energia de Biomassa
SUMMARY:

For municipal wastewater treatment with energy recovery, chemically enhanced primary treatment (CEPT) can be used for organic matter capture before nutrient removal in membrane photobioreactors (MPBR), with biogas production through anaerobic digestion (AD) of sludge and biomass. Furthermore, methane yield in AD can be enhanced by biomass thermal treatment, with heating techniques or hydrothermal carbonization (HTC), which produces hydrochar and process water with easily biodegradable organics. However, processes optimization and co-digestion with sludge are yet to be assessed and the excessive phosphorus removal in CEPT might hinder MPBR performance, prejudicing biomass productivity and AD. This work evaluated the performance of a MPBR integrated with CEPT, with valorization of the solid fraction through MPBR biomass HTC and anaerobic digestion and co-digestion of the sludge, biomass (pre-heated or not) and the process waters generated in HTC. Two parallel reactors were compared, one fed with effluent from CEPT with Tannin (M-TAN) and other from CEPT with PACl (M-PACl), with three combinations of hydraulic retention times (HRT) and sludge retention times (SRT): 58 h/14 d; 36 h/14 d and; 36 h/7 d. The partial results presented show that both coagulants efficiently removed particulate COD, but phosphate removal with tannin (15%) was lower than with PACl (93%). In M-PACl, the lack of phosphorus resulted in lower biomass concentrations, productivities and Chlorophyll-a/VSS ratios (1.2-0.6 g·L-1 and 7.9-9.0 mgChl-a·gVSS-1) compared to M-TAN (1.6-1.1 g·L-1 and 12.3-18.7 mgChl-a·gVSS-1), with HRT and SRT reductions resulting in lower concentration and ratios. Soluble microbial products (SMPs) and extracellular polymeric substances (EPSs) were higher in the M-PACl system, leading to poorer biomass filterability and transmembrane pressure increases, especially at lower HRT or SRT. The M-TAN pressure remained stable. Furthermore, nitrogen removal was lower in M-PACl (38-52%) than in M-TAN (63-91%). Hence, the phosphorus availability proved to be a critical aspect of MPBR operation, with excessive phosphorus removal by PACl negatively impacting the bioreactor performance, while CEPT with tannin led to higher stability and efficiency.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 1073159 - EDUARDO LUCAS SUBTIL
Membro Titular - Examinador(a) Interno ao Programa - 1548098 - GILBERTO MARTINS
Membro Titular - Examinador(a) Externo à Instituição - ANDRÉ BEZERRA DOS SANTOS - UFC
Membro Suplente - Examinador(a) Interno ao Programa - 1648855 - ANA MARIA PEREIRA NETO
Membro Suplente - Examinador(a) Externo ao Programa - 2342998 - RODRIGO DE FREITAS BUENO