Removal of dyes from wastewater using polyelectrolyte enhanced ultrafiltration (PEUF)

Abstract

ab s t r ac tPolyelectrolyte-based separation of toxic dyes is studied to estimate the potential of polyelectroyte enhanced ultrafiltration (PEUF) using poly(ammonium-acrylate) as anionic polymer. PEUF experiments are conducted to study the retention characteristics of two model dyes (Safranin T (ST) and Eriochrome Blue Black R (EBBR) in the continuous cross flow system. Effects of the operating conditions, e.g., transmembrane pressure, feed polyelectrolyte concentration, feed dye concentration, ionic strength and pH on the permeate flux profile and observed retention have been investigated. The results show that the highest rejection for ST and EBBR dyes are 99% and 90% respectively. The enhancement is primarily due to the formation of complexes between the anionic polymer and dye molecules. The retention of ST decreases with ionic strength. High retention was obtained at pH range 4-10 in the case of ST; this effect was attributed to the increase of electrostatic interaction. The ionic strength and pH have no effect on the removal of EBBR.

Kinetic modeling for dye removal using polyelectrolyte enhanced ultrafiltration

“…The experimental findings of PEUF for dyes, crystal violet (CV), Eriochrome Blue Black R (EBBR) and Saffarin T (ST) have been taken from literature [33,34]. Some important experimental features are presented here.…”

“…In the present study, a theoretical model has been developed under a generalized kinetic framework to predict the retention of polymer-dye complex formation. The constants for dissociation and complexation formation are optimized by comparing the calculated retention profile with the experimental data [33,34]. An extensive mathematical analysis has also been presented to relate and identify the domains of the feasible solution of the different parameters for various experimental conditions.…”

Enhanced separation of toxic Blue BG dye by cloud point extraction with IL as an additive: Effect of parameters, solubilization isotherm and evaluation of thermodynamics and design parameters

“…A number of researchers have studied various techniques for the removal of colored dye from wastewater such as, nanofiltration [2], polyelectrolyte or micelle-enhanced ultrafiltration [3,4], waste material adsorption [5] and various advanced oxidation processes [6,7]. Each method has its certain advantages and drawbacks.…”

Use of sodium alginate biopolymer as an extracting agent of methylene blue in the polymer‐enhanced ultrafiltration technique

“…The interactions can be electrostatic, hydrogen bonding and/or Van Der Waals forces. 28,29 Pollutant species that have limited or no interaction with the polymer are eluted to the filtrate. 30,31 It has been reported in the literature that this technique has been used for the removal of various metal ions from water, along with emerging contaminants and cationic dyes.…”