Evaluation of several commercial synthetic polymers as flocculant aids for removal of highly concentrated C.I. Acid Black 210 dye

Abstract

The removal of C.I. Acid Black 210 dye from highly concentrated solutions was studied using a coagulation/flocculation process. Aluminium sulphate was used as a primary coagulant and five commercial polymers were used as flocculant aids. The five commercial polymers were ACCEPTA 2058 (poly-diallyl-dimethyl ammonium chloride), ACCEPTA 2047 (high molecular mass (MM) anionic polyacrylamide), ACCEPTA 2111 (high MM cationic polyacrylamide), ACCEPTA 2105 (Low-medium MM cationic polyacrylamide) and ACCEPTA 2037 (Composite of high MM cationic polyacrylamide-inorganic salt(s)). The five polymers behaved differently and they showed maximum colour removal increment in the order: ACCEPTA 2058 > ACCEPTA 2037 > ACCEPTA 2111 approximately = ACCEPTA 2047 > ACCEPTA 2105. Results also showed that the aluminium sulphate is important as primary coagulant and settling time has significant effect on the dye removal.

Removal of textile dye by mixed oxide-LDH: kinetics, isotherms of the adsorption and retention mechanisms studies

“…However, strong chemical bonds between the adsorbate and the adsorbent require a longer contact time to achieve equilibrium [11] Figure. 4.Effet of contact time on the uptake of AO7 by HT500, m adsorbent =20mg, V= 50 ml,T=25°C,pH=6…”

“…Theadsorption kinetic was analyzed by the pseudo first-order equation [21], i.e., (3) or pseudo-second order [22][23], i.e., (4). ln(q e -q t ) = ln(q e ) -t.K 1,ads i.e., (3) t∕q t = t ∕q e + 1 ∕( q e 2 .…”

“…Annually, approximately 710 5 tons of dyes are produced, and approximately 710 4 tons/year are discarded by industries, including the textile, rubber, food, paper and plastic industries [1][2][3] Because of their high organic matter concentrations and their intense colors, the effluents discarded by the food industry are an important source of pollution for water bodies. When discharged into streams, these effluents reduce the transmission ofsunlight into the depleted dissolved oxygen zone [4][5][6] and may cause changes in aquatic biota (particularly near the release point).Thus, it becomes necessary to remove these materials before they are mixed with natural and unpolluted water bodies [2].…”

“…When discharged into streams, these effluents reduce the transmission ofsunlight into the depleted dissolved oxygen zone [4][5][6] and may cause changes in aquatic biota (particularly near the release point).Thus, it becomes necessary to remove these materials before they are mixed with natural and unpolluted water bodies [2].…”

“…Activated carbon is the most popular adsorbent due to its high adsorption capacity for organic and inorganic pollutants [4].Moreover, the use of low costmaterials for adsorption has attracted attention as a color removal technique. For example, natural clays, bagasse fly ash, chitosan and other adsorbents have been used [10][11][12][13][14].…”