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Ozone Pre-Treatment to Enhance Anaerobic Degradation of Refractory Landfill Leachate Organics

Title: Ozone Pre-Treatment to Enhance Anaerobic Degradation of Refractory Landfill Leachate Organics.
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Name(s): Qiao, Yu, author
Watts, Michael, professor directing thesis
Chen, Gang, committee member
Hilton, Amy Chan, committee member
Department of Civil and Environmental Engineering, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2012
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Advanced oxidation processes (AOPs) have garnered recent consideration as an option to reduce organic loading, and the recalcitrance of mature landfill leachate. Hydroxyl radicals (*OH) are produced during AOPs, which are effective in destroying organic chemicals. To investigate the potential for leachate conditioning by pre-ozonation treatment (O3/H2O2 and O3), low-mg/L level ozone stock solutions were spiked into an `old' landfill leachate (0 to 7.5mg/L O3). The stoichiometric ratio of 1.1:1 was determined to be the optimal molar ratio of O3 to H2O2 based on the biodegradability of the leachate organics. The leachate conditioning includes: measurement of the three anthropogenic contaminants tris-(2-chloroethyl) phosphate (TCEP), tris-(butoxyethyl)-phosphate (TBEP) and 17ß-estradiol (E2) by pre-ozonation treatment and the pre-ozonation followed by anaerobic treatment; COD and BOD5/COD analysis of the ozonated leachate; measurement of the methane and total gas formation during the anaerobic incubation; also the COD analysis of the mixed leachate and sludge solution during the anaerobic incubation. When treating with O3 and O3/H2O2 pre-oxidation, the removal of E2 was 65% at the ozone dose of 4.5mg/L to 5.4mg/L, which was higher than that of TCEP and TBEP. Based on one-way ANOVA analysis, the O3/H2O2 pre-treatment was observed to have significantly improved degradation of E2 during anaerobic incubation of oxidized leachates (removal rate of E2 was 53.7% after 15 days of incubation). However, O3 pre-treatment improved post-ozone degradation of TCEP and TBEP by 26% and 39.3% as compared with O3/H2O2 after 15 days of incubation. In addition, overall anaerobic activity was not impacted by the applied ozone pre-treatments, as measured by methane formation, total gas formation, and COD removal. In general, low-mg/L ozone pre-treatment, prior to anaerobic incubation, was found to improve biological degradation
Identifier: FSU_migr_etd-5421 (IID)
Submitted Note: A Thesis submitted to the Department of Civil and Environmental Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Fall Semester, 2012.
Date of Defense: September 28, 2012.
Keywords: Advanced oxidation processes(AOPs), anaerobic, leachate, ozone
Bibliography Note: Includes bibliographical references.
Advisory Committee: Michael Watts, Professor Directing Thesis; Gang Chen, Committee Member; Amy Chan Hilton, Committee Member.
Subject(s): Civil engineering
Environmental engineering
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5421
Owner Institution: FSU

Choose the citation style.
Qiao, Y. (2012). Ozone Pre-Treatment to Enhance Anaerobic Degradation of Refractory Landfill Leachate Organics. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5421