Reuse of textile wastewater after homogenization–decantation treatment coupled to PVDF ultrafiltration membranes

Abstract

The textile industry is one of the largest consumers of water in the world and its wastewater is a serious problem when it is discharged without the proper treatment. In this work, wastewater generated by textile industry was treated coupling a homogenization-decantation treatment with polyvinylidene difluoride (PVDF) ultrafiltration membranes.Initially, the wastewater was aerated in a homogenization-decantation tank where 17% colour and 10% chemical oxygen demand (COD) were removed. The aerated effluent was treated with an ultrafiltration membrane in order to reuse the permeate in new dyeing processes. Firstly, the ultrafiltration treatment was performed in a laboratory plant. The permeate analysis showed 20% colour removal and 60% COD decrease.On the basis of these results, a semi-industrial system was built. With this plant, the permeate characterization showed similar results. The system was found to be scalable and suitable for the treatment of this kind of effluents.Finally, new dyeings were performed with both permeates. Monochromatic dyeings were carried out with 100% permeate whereas 50% permeate was reused for dyeings with a mixture of three dyes. The colour differences were found to be lower than 1.5, which was the acceptance value established.

Textile dye wastewater characteristics and constituents of synthetic effluents: a critical review

“…Their study suggests that the ozonation technique could be successfully used as a posttreatment after the main biological process, for recalcitrant compound degradation. Buscio et al (2015) treated real textile effluents from a dying process (Terrassa, Spain) using a combination of two treatment methods: homogenisation decantation and membrane treatments. The two treatment systems removed around 66% and 30% of COD and colour, respectively.…”

Tratamiento De Aguas Residuales De La Industria Textil Mediante Coagulación Química Acoplada a Procesos Fenton Intensificados Con Ultrasonido De Baja Frecuencia

“…De 100 a 200 L de agua son necesarios para producir un kilogramo de productos textiles (Carvalho et al 2016). El agua residual resultante está altamente contaminada debido a la presencia de colorantes, surfactantes, sales inorgánicas y distintos compuestos químicos empleados en el proceso productivo (Buscio et al 2015). Los valores reportados para la demanda química de oxí-geno (DQO) son de alrededor de 900 a 5000 mg/L y la demanda bioquímica de oxígeno (DBO 5 ) -con relaciones de biodegradabilidad (DBO 5 /DQO)-son inferiores a 0.15 (Cheshmeh y Safari 2016, Naje et al 2016, Yurtsever et al 2016.…”

Estudo comparativo do tingimento de malha PES/CO com água tratada com resíduo de clarificação de óleo vegetal, na forma natural e calcinada

“…No estudo realizado por SALA e colaboradores [27] ao reutilizarem efluente tratado com combinação entre tratamento eletroquímico e radiação UV, em novos tingimentos de algodão com corantes reativos, obtiveram DE entre 0,05 a 0,56, segundo autores é possível uma economia de água em até 70 %. BUSCIO e colaboradores [28] utilizaram tratamento combinado de homogeneização-decantação com ultrafiltração no tratamento de efluente, coletado em uma empresa na Espanha. Após o tratamento a água foi reutilizada em novos tingimentos de poliéster, na proporção 50/50 (v/v) água tratada/água destilada, com os corantes dispersos obtendo valores de DE entre 0,51 e 0,85, resultando em uma economia de água de 50%.…”