Item


Metal ions removal from polluted waters by sorption onto exhausted coffee waste. Application to metal finishing industries wastewater treatment

A new technology for Cr(VI) and divalent metal ions removal based on metal sorption onto exhausted coffee waste has been developed. Physical and chemical characterization of exhausted coffee waste was explored as well as the role of structural and non structural compounds of the waste in metal ions sorption. Kinetics of Cr(VI) sorption from binary mixtures containing different Cr(VI) and Cu(II) molar ratios were carried out in a batch reactor. A synergistic effect of Cu(II) in Cr(VI) reduction and sorption was found. From the kinetic sets of data a kinetic model taking into account Cr(VI) reduction/sorption, reduced Cr(III) sorption and Cu(II)synergistic effect on sorption was developed. The model described quite accurately the overall process of Cr(VI) removal. Biosorption by coffee wastes followed by precipitation resulted to be an efficient and low cost technology to remove Cr(VI) and divalent metals from synthetic and industrial effluents from metal finishing industries

S鈥檋a desenvolupat una tecnologia nova per a l鈥檈liminaci贸 de Cr(VI) i metalls divalents basada en l鈥檃dsorci贸 dels metalls en residus de marro de caf茅. Es va dur a terme la caracteritzaci贸 f铆sicoqu铆mica del marro de caf茅 i es va investigar el paper dels components estructurals i no estructurals en l鈥檃dsorci贸 de metalls. Emprant un tanc agitat es va estudiar la cin猫tica d鈥檃dsorci贸 de Cr(VI) de mescles bin脿ries de Cr(VI)-Cu(II) amb diferents relacions molars d鈥檃mbdos metalls. Es va trobar un efecte sin猫rgic del coure sobre l鈥檃dsorci贸 i la reducci贸 de Cr(VI). Un model basat en la reducci贸/adsorci贸 de Cr(VI), adsorci贸 del Cr(III) format i l鈥檈fecte sin猫rgic del coure va ser desenvolupat. El model va descriure adequadament el proc茅s. La bioadsorci贸 seguida de precipitaci贸 va resultar ser una tecnologia efica莽 i de baix cost per eliminar Cr(VI) i metalls divalents d鈥檃ig眉es sint猫tiques i efluents d鈥檌nd煤stries de tractament de superf铆cies

Universitat de Girona

Manager: Villaescusa Gil, Isabel
Poch Garcia, Jordi
Other contributions: Universitat de Girona. Departament d鈥橢nginyeria Qu铆mica, Agr脿ria i Tecnologia Agroaliment脿ria
Author: Liu, Chang
Date: 2014 October 15
Abstract: A new technology for Cr(VI) and divalent metal ions removal based on metal sorption onto exhausted coffee waste has been developed. Physical and chemical characterization of exhausted coffee waste was explored as well as the role of structural and non structural compounds of the waste in metal ions sorption. Kinetics of Cr(VI) sorption from binary mixtures containing different Cr(VI) and Cu(II) molar ratios were carried out in a batch reactor. A synergistic effect of Cu(II) in Cr(VI) reduction and sorption was found. From the kinetic sets of data a kinetic model taking into account Cr(VI) reduction/sorption, reduced Cr(III) sorption and Cu(II)synergistic effect on sorption was developed. The model described quite accurately the overall process of Cr(VI) removal. Biosorption by coffee wastes followed by precipitation resulted to be an efficient and low cost technology to remove Cr(VI) and divalent metals from synthetic and industrial effluents from metal finishing industries
S鈥檋a desenvolupat una tecnologia nova per a l鈥檈liminaci贸 de Cr(VI) i metalls divalents basada en l鈥檃dsorci贸 dels metalls en residus de marro de caf茅. Es va dur a terme la caracteritzaci贸 f铆sicoqu铆mica del marro de caf茅 i es va investigar el paper dels components estructurals i no estructurals en l鈥檃dsorci贸 de metalls. Emprant un tanc agitat es va estudiar la cin猫tica d鈥檃dsorci贸 de Cr(VI) de mescles bin脿ries de Cr(VI)-Cu(II) amb diferents relacions molars d鈥檃mbdos metalls. Es va trobar un efecte sin猫rgic del coure sobre l鈥檃dsorci贸 i la reducci贸 de Cr(VI). Un model basat en la reducci贸/adsorci贸 de Cr(VI), adsorci贸 del Cr(III) format i l鈥檈fecte sin猫rgic del coure va ser desenvolupat. El model va descriure adequadament el proc茅s. La bioadsorci贸 seguida de precipitaci贸 va resultar ser una tecnologia efica莽 i de baix cost per eliminar Cr(VI) i metalls divalents d鈥檃ig眉es sint猫tiques i efluents d鈥檌nd煤stries de tractament de superf铆cies
Format: application/pdf
Document access: http://hdl.handle.net/10803/283705
Language: eng
Publisher: Universitat de Girona
Rights: ADVERTIMENT. L鈥檃cc茅s als continguts d鈥檃questa tesi doctoral i la seva utilitzaci贸 ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, aix铆 com en activitats o materials d鈥檌nvestigaci贸 i doc猫ncia en els termes establerts a l鈥檃rt. 32 del Text Ref贸s de la Llei de Propietat Intel路lectual (RDL 1/1996). Per altres utilitzacions es requereix l鈥檃utoritzaci贸 pr猫via i expressa de la persona autora. En qualsevol cas, en la utilitzaci贸 dels seus continguts caldr脿 indicar de forma clara el nom i cognoms de la persona autora i el t铆tol de la tesi doctoral. No s鈥檃utoritza la seva reproducci贸 o altres formes d鈥檈xplotaci贸 efectuades amb finalitats de lucre ni la seva comunicaci贸 p煤blica des d鈥檜n lloc ali猫 al servei TDX. Tampoc s鈥檃utoritza la presentaci贸 del seu contingut en una finestra o marc ali猫 a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i 铆ndexs.
Subject: Qu铆mica
Enginyeria. Tecnologia
Title: Metal ions removal from polluted waters by sorption onto exhausted coffee waste. Application to metal finishing industries wastewater treatment
Type: doctoralThesis
Repository: TDX

Subjects

Authors


Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php5) in Unknown on line 0