Hybrid MF and membrane bioreactor process applied towards water and indigo reuse from denim textile wastewater.
This work investigates the application of a microfiltration (MF)-membrane bioreactor (MBR) hybrid process for textile dyeing process wastewater reclamation. The indigo blue dye was efficiently retained by the MF membrane (100%), which allows its recovery from the concentrate stream. MF promotes 100% of colour removal, and reduces the chemical oxygen demand (COD) and conductivity by about 65% and 25%, respectively, and improves the wastewater biodegradability. MF flux decline was mostly attributed to concentration polarization and the chemical cleaning was efficient enough to recover initial hydraulic resistance. The MBR provides to be a stable process maintaining its COD and ammonia removal efficiency (73% and 100%, respectively) mostly constant throughout and producing a permeate that meets the reuse criteria for some industry activities, such as washing-off and equipment washdown. The use of an MF or ultrafiltration (UF) membrane in the MBR does not impact the MBR performance in terms of COD removal. Although the membrane of MBR-UF shows permeability lower than MBR-MF membrane, the UF membrane contributes to a more stable operation in terms of permeability.
a Department of Sanitary and Environmental Engineering , Federal University of Minas Gerais , Belo Horizonte , Brazil.
Carolina Fonseca
CF
Couto
a Department of Sanitary and Environmental Engineering , Federal University of Minas Gerais , Belo Horizonte , Brazil.
Larissa Silva
LS
Marques
a Department of Sanitary and Environmental Engineering , Federal University of Minas Gerais , Belo Horizonte , Brazil.
Janine
J
Balmant
b Department of Environmental Science and Technology , Federal Center of Technological Education of Minas Gerais , Belo Horizonte , Brazil.
Andreza Penido
AP
de Oliveira Maia
b Department of Environmental Science and Technology , Federal Center of Technological Education of Minas Gerais , Belo Horizonte , Brazil.
Wagner Guadagnin
http://orcid.org/0000-0002-9851-7520
WG
Moravia
a Department of Sanitary and Environmental Engineering , Federal University of Minas Gerais , Belo Horizonte , Brazil.
Miriam Cristina
MC
Santos Amaral
D019149:Bioreactors; D007203:Indigo Carmine; D008567:Membranes, Artificial; D013783:Textile Industry; D013784:Textiles; D014865:Waste Disposal, Fluid; D062065:Wastewater; D014867:Water; D018508:Water Purification
D007203:Indigo Carmine; D008567:Membranes, Artificial; D062065:Wastewater; D014867:Water
Microfiltration; fouling; indigo blue; membrane bioreactor; textile effluent