The heterogeneous coagulation and flocculation of brewery wastewater using carbon nanotubes

Abstract

HighlightsØ Different chemicals were compared for the coagulation and flocculation of brewery wastewater.Ø Carbon nanotubes can be used as heterogeneous coagulants in the pretreatment of brewery wastewater.Ø Ferric chloride was a more effective coagulant than both functionalised and pristine CNTs. AbstractCoagulation and flocculation treatment processes play a central role in the way wastewater effluents are managed. Their primary function is particle removal that can impart color to a water source, create turbidity, and/or retain bacterial and viral organisms. This study was carried out to investigate whether carbon nanotubes (CNTs) can be used as heterogeneous coagulants and /or flocculants in the pretreatment of brewery wastewater. A series of experiments were conducted in which the efficiencies of pristine and functionalised CNTs were compared with the efficiency of traditional ferric chloride in a coagulation/flocculation process. Turbidity and chemical oxygen demand (COD), including the zeta potential were used to monitor the progress of the 2 coagulation/flocculation process. Both pristine and functionalised CNTs demonstrated the ability to successfully coagulate colloidal particles in the brewery wastewater. Overall, ferric chloride was found to be a more effective coagulant than both the pristine and functionalised CNTs.

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