REMOVAL OF REACTIVE DYE REMAZOL BRILLIANT BLUE R FROM AQUEOUS SOLUTIONS BY USING ANAEROBICALLY DIGESTED SEWAGE SLUDGE BASED ADSORBENTS

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ÖZÇİMEN D., Salan T.

CHEMICAL INDUSTRY & CHEMICAL ENGINEERING QUARTERLY, vol.22, no.2, pp.167-179, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 22 Issue: 2
  • Publication Date: 2016
  • Doi Number: 10.2298/ciceq141128029o
  • Journal Name: CHEMICAL INDUSTRY & CHEMICAL ENGINEERING QUARTERLY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.167-179
  • Keywords: sewage sludge, carbonization, activated carbon, adsorption, Remazol Brilliant Blue R, LOW-COST ADSORBENTS, ACTIVATED CARBON, ADSORPTION, WASTE, WATER, BIOSORPTION, COMPOSITE, DEGRADATION, SORPTION, ORANGE
  • Yıldız Technical University Affiliated: Yes

Abstract

In this study, adsorbents were produced from sewage sludge via chemical and thermal activation processes. Experiments were carried out in a tubular furnace at a heating rate of 20 degrees C min(-1) and temperature of 550 degrees C with a nitrogen flow rate of 400 mL min(-1) for 1 h. Dye adsorption experiments were performed with Remazol Brilliant Blue R at several concentrations under batch equilibrium conditions by comparing sewage sludge based adsorbents with raw material and a commercial activated carbon. Maximum adsorption capacities of carbonized sewage sludge (CSWS) and activated sewage sludge (ASWS) were found as 7413 and 9.376 mg g(-1) for 100 mg L-1 dye solution, whereas commercial activated carbon had a capacity of 11.561 mg g(-1) Freundlich and Langmuir isotherms were used to explain the adsorption mechanism together with pseudo-first-order and pseudo-second-order kinetic models. The Langmuir isotherm, which had adsorption capacities of 34.60 (CSWS) and 7299 mg g(-1) (ASWS), provided a better fit to the equilibrium data than that of the Freundlich isotherm. The pseudo second-order model, which had adsorption capacities of 7451 (CSWS) and 9.319 mg g(-1) (ASWS), was very favorable to explain the adsorption kinetics of the dye with high regression coefficients.