Comparison of the sorption capacity of basic, acid, direct and reactive dyes by compost in batch conditions

Research on biosorption of organic dyes is an important subject for the development clean technologies treatment textile wastewater. In this work, process sorption four different natures, namely Basic Violet 10 (BV10), Acid Red 27 (AR27), Direct Blue 151 (DB151) and Reactive 4 (RV4) onto two composts, pine bark compost municipal solid waste compost, has been studied. For this, kinetics equilibrium at solution pH values (3.0–7.0) salinity (0–1.0 M KCl) conditions have assessed in batch experiments. Sorption rates were relatively slow BV10, reaching only after 24 h, faster rest: around 5–6 h RV4 AR27 2 DB151. Kinetics dye followed a pseudo-first order model, except that DB151, which was better described by pseudo-second model. The sequence adsorption capacity both composts as follows: BV10 > DB151 AR27. general, adequately Langmuir what allows to estimate maximum retention capacities each composts. At best removal conditions, presented 204 mg g?1 54 23 RV4, 4.1 AR27, whereas showed 74 38 36 1.6 increased acid all cases, likely because modification charges higher electrostatic attraction, increasing also had positive effect sorption, attributed solute-aggregation mechanism solution. conclusion, waste-derived products, like can be applied colorants from wastewater, although they would more effective basic cationic than other types, due interaction with mostly negatively-charged