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  4. The use of design of experiments for the evaluation of the production of surface rich activated carbon from sewage sludge via microwave and conventional pyrolysis
 
Zitierlink DOI
10.26092/elib/2598
Verlagslink DOI
10.1016/j.applthermaleng.2015.09.035

The use of design of experiments for the evaluation of the production of surface rich activated carbon from sewage sludge via microwave and conventional pyrolysis

Veröffentlichungsdatum
2016-01-25
Autoren
Simoes dos Reis, Glaydson  
Wilhelm, Michaela  
Canuto de Almeida e Silva, Thamires  
Rezwan, Kurosch  
Hoffmann Sampaio, Carlos  
Lima, Eder Claudio  
Guelli Ulson de Souza, Selene M. A.  
Zusammenfassung
Experimental design and response surface methodology were used for the preparation and comparison of activated carbon produced from sewage sludge by two types of pyrolysis: conventional furnace and microwave. The preparation method was performed following a full fractional factorial design (23), in-cluding pyrolysis temperature or power radiation, holding time and chemical activation agent, and specific surface area (SBET) of prepared activated carbon. The influence of these factors on the SBET of obtained carbon was investigated using an analysis of variance. Samples made by conventional pyrolysis showed overall higher SBET values than samples synthesised by the microwave method. The optimum parameters for the preparation of activated carbon using the conventional pyrolysis have been identified as: pyrolysis temperature of 500 °C, holding time of 15 min, and a ratio of ZnCl2:sludge of 0.5. Microwave pyrolysis is found to be optimal when operating at 980Wfor 12 min. Under these conditions, SBET values of 679 and 501m2g−1, respectively, have been obtained. The analysis of nitrogen adsorption/desorption isotherms revealed the presence of micro and mesopores in the activated carbon. The most important significant factor, according statistical analysis, in the variance in SBET for the conventional pyrolysis samples were the pyrolysis temperature and interaction between pyrolysis temperature, holding time and ratio of ZnCl2:sludgewere the most important factors. The highest impact parameters for the microwavemethod were found for the interaction between power radiation and ratio of ZnCl2:sludge and the holding time.
Schlagwörter
Sewage sludge

; 

Statistical design of experiments

; 

Microwave and conventional pyrolysis

; 

Activated carbon
Verlag
Elsevier {BV}
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Institute
Fachgebiet 17: Keramische Werkstoffe und Bauteile  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Applied Thermal Engineering  
Band
93
Startseite
590
Endseite
597
Seitenzahl
8
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
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Vorschaubild
Name

DOS REIS - The use of design of experiments.pdf

Size

2.19 MB

Format

Adobe PDF

Checksum

(MD5):6d92d760d1c00445f68f42b0237707ac

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