Anionic Surfactants Removal by Natural Coagulant/Flocculant Products

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 r 2 levels above 0.90 in all cases.

Emerging usage of plant-based coagulants for water and wastewater treatment

“…Tannin is a general name given to large polyphenol compounds obtained from natural materials, for example, the organic extract from bark and wood [36] of trees such as Acacia, Castanea, or Schinopsis [37]. It is a polymer with molecular weights ranging from hundreds to tens of thousands and traditionally used as a tanning agent in the leather industry.…”

Removal of TiO2 Nanoparticles During Primary Water Treatment: Role of Coagulant Type, Dose, and Nanoparticle Concentration

“…Moreover, an important phenomena involving the effectiveness of metal coagulants is from the pH change caused by hydrolysis of the metal cations (in this case, Al 3 + and Fe 3 + ); the change in pH of the solution governs the metal coagulants' effectiveness during coagulation since metal ion solubility will be affected (Crittenden and Harza, 2005;Gregory, 2005). Others have demonstrated the use of conventional water treatment processes (i.e., coagulation, flocculation, and sedimentation [CFS]) to effectively remove natural organic matter, suspended solids, disinfection byproduct precursors, and other inorganic constituents from water and wastewater (Duan et al, 2002;Domínguez et al, 2005;Beltrán-Heredia et al, 2009;Zhao et al, 2009;Kim et al, 2012). However, even with these studies and many others, the involvement of these removal mechanisms in the destabilization and separation of nanomaterials is yet unknown.…”

Textile wastewater purification through natural coagulants

“…This should be the controlling stage, so that the entire process can be simulated as an adsorption phenomenon. Previous studies have found the coagulation capacity q to be a suitable evaluation parameter (Beltrán-Heredia et al 2009b).…”