Hydrothermal oxidation of fecal sludge. Experimental investigations and kinetic modeling
Loading...
Author (Corporation)
Publication date
17.10.2016
Typ of student thesis
Course of study
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Industrial & Engineering Chemistry Research
Special issue
DOI of the original publication
Link
Series
Series number
Volume
55
Issue / Number
Pages / Duration
11910-11922
Patent number
Publisher / Publishing institution
American Chemical Society
Place of publication / Event location
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
Hydrothermal oxidation (HTO) provides an efficient technique to completely destroy wet organic wastes. In this study, HTO was applied to treat fecal sludge at well-defined experimental conditions. Four different kinetic models were adjusted to the obtained data. Among others, a distributed activation energy model (DAEM) was applied. A total of 33 experiments were carried out in an unstirred batch reactor with pressurized air as the oxidant at temperatures of <470 °C, oxygen-to-fuel equivalence ratios between 0 and 1.9, feed concentrations between 3.9 and 9.8 molTOC L−1 (TOC = total organic carbon), and reaction times between 86 and 1572 s. Decomposition of the fecal sludge was monitored by means of the conversion of TOC to CO2 and CO. In the presence of oxygen, ignition of the reaction was observed around 300 °C, followed by further rapid decomposition of the organic material. The TOC was completely decomposed to CO2 within 25 min at 470 °C and an oxygen-to-fuel equivalence ratio of 1.2. CO was formed as an intermediate product, and no other combustible products were found in the gas. At certain reaction conditions, the formation of unwanted coke and tarlike products occurred. The reaction temperature and oxygen-to-fuel equivalence ratio showed a significant influence on TOC conversion, while the initial TOC concentration did not. Conversion of TOC to CO2 could be well described with a first-order rate law and an activation energy of 39 kJ mol−1.
Keywords
Subject (DDC)
Event
Exhibition start date
Exhibition end date
Conference start date
Conference end date
Date of the last check
ISBN
ISSN
0888-5885
1520-5045
1520-5045
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Zero Emission
Publication status
Published
Review
Peer review of the complete publication
Open access category
Hybrid
License
Citation
Hübner, T., Roth, M., & Vogel, F. (2016). Hydrothermal oxidation of fecal sludge. Experimental investigations and kinetic modeling. Industrial & Engineering Chemistry Research, 55, 11910–11922. https://doi.org/10.1021/acs.iecr.6b03084