Optimum Coagulant from Acacia mearnsii de Wild for Wastewater Treatment

Abstract

A novel coagulant agent from Acacia mearnsii de Wild tannin extract was characterized for removal of the anthraquinonic colorant Alizarin Violet 3R and the anionic surfactant sodium dodecylbenzene sulfonate. This coagulant is the result of a previous optimization study. The influence of operative variables such as temperature, coagulant dosage, initial pollutant content, and pH was investigated. The new coagulant demonstrates a high affinity for dye and surfactant and is efficient within a wide range of working conditions. While the temperature does not affect the coagulant ability, an acidic pH seems to increase the contaminant removal from aqueous solutions. Implementation in a pilot plant confirms the feasibility of this coagulant not only at lab scale, but also at higher level.

Textile Dye Removal by Acacia dealbata Link. Pollen Adsorption Combined with UV-A/NTA/Fenton Process

“…At acidic pH, it is observed the cationic form of the pollen, which should be higher at acidic pH and lower at basic level. The electrostatic attraction between pollen cationic chains and negatively charged anions in the dye molecules, was then reinforced and the links to hydrophobic chains were enhanced [53]. At neutral pH, relatively low adsorption of AR88 by pollen was observed because HO − could compete with the dye anions for sorption sites [54].…”

Quebracho colorado

“…These mathematical approaches are called adsorption-like coagulation models, and we have previously reported their use (Sánchez-Martín et al, 2011;. However, it is possible to adopt a theoretical proposal based on the surfactant-polymer interaction models.…”

Agro-Industrial Wastewater Treatment with Acacia dealbata Coagulation/Flocculation and Photo-Fenton-Based Processes

“…A. dealbata was first introduced in Europe in 1816 for horticultural and floricultural purposes (in Portugal, 1850), although in 1999 it was officially listed as invasive [12]. Several authors point out the successful use of coagulants derived from different subspecies of the plant Acacia to treat wastewater [13][14][15][16][17]; therefore, A. dealbata leaves could provide a good product for CFD processes, although, to our knowledge, no studies on this have been reported. Therefore, two environmental problems are addressed in this work: the treatment and control of WW via A. dealbata dissemination.…”