Abstract
A new tannin-based coagulant and flocculant agent has been tested on the removal of sodium dodecyl benzene sulfonate (SDBS), a dangerous and pollutant anionic surfactant. It is called Tanfloc and consists of a chemically modified tannin extract from Acacia mearnsii de Wild. Tanfloc has been revealed as an efficient product in anionic surfactant removal. Around 70% of SDBS removal has been achieved with Tanfloc doses of 150 mg·L−1. pH has a negative influence on surfactant removal, while the higher the initial surfactant concentration is the higher q capacity is obtained. Theoretical data adjustment has been carried out according to three different models: Frumkin−Fowler−Guggenheim (FFG), Gu and Zhu (G−Z), and Freundlich (F). Adjustment parameters have been obtained with r2 levels above 0.90 in all cases.
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