Mechanisms of Dye Wastewater Colour Removal by Magnesium Carbonate-Hydrated Basic

Abstract

The effects of alkaline magnesium carbonate-hydrated basic as a coagulant, have been investigated in colour reduction experiments using Jar Test apparatus. The raw wastewater was synthetic containing 300 mg/dm3 reactive red dye 519. It has been found that no single flocculant (Mg(OH)2, Ca(OH)2 or CaCO3) can satisfactorily effect colour removal. The effective colour reduction achieved using alkaline magnesium carbonate-hydrated basic has been attributed to the synergistic sorbing capacity of the flocculants Mg(OH)2 and CaCO3.

Removal of dyes from water using crosslinked aminomethane sulfonic acid based resin

“…Therefore, color removal from waste-water is a major environmental problem. The conventional methods for treating dyes containing waste-waters are coagulation and flocculation (Panswad and Wongchaisuwan 1986), oxidation or ozonation (Malik and Saha 2003), and membrane separation (Ciardelli et al 2000). But these technologies do not show significant effectiveness or economic advantage.…”

Photocatalytic decolorization of congo red over ZnO powder using Box–Behnken design of experiments

“…The decolorization of such dyes have been carried out with different methods by many workers [3±17]. Since colored solution containing dyes may cause skin cancer due to photosensitization and photodynamic damage, techniques like dissolved air-¯oa-tation [18], coagulation [19], ion-exchange, reverse osmosis, adsorption [20] and oxidation with peroxide (or) ozone are usually applied for the removal and destruction of dyes in waste water [21]. Currently no single economically feasible method can be relied upon for treating textile ef¯uents.…”

Removal of Congo red from aqueous solution using a chitosan/organo‐ montmorillonite nanocomposite

“…Among many methods for removing dyes, including coagulation and flocculation, 4 membrane separation, 5 oxidation or ozonation, 6,7 electro-coagulation 8 and adsorption, 1 adsorption has been found to be an effective and economical method for the removal of dyes from wastewater. Many non-conventional, low cost adsorbents such as biogas waste slurry, 9 waste banana pith, 10 paddy straw, 11 waste Fe(III)/Cr(III) hydroxide, 12 waste orange peel, 13 waste red mud, 14 calcium-rich fly ash, 15 etc., have been used for the removal of CR.…”