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You searched for +publisher:"University of Colorado" +contributor:("Zhiyong "Jason" Ren"). Showing records 1 – 3 of 3 total matches.

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University of Colorado

1. Cui, Yixiao. Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions.

Degree: MS, 2017, University of Colorado

Soil contamination has become a growing problem worldwide. Common soil remediation technologies including physical excavation, chemical oxidation or reduction are generally energy and chemical intensive. Compare to them, bioelectrochemical systems (BECSs) is a relatively cost-effective and environmentally friendly way to treat contaminated soil. Much work has been done using BECS on soil remediation, both in laboratory scales and in the field. But many limitations still restrict the application and development of soil BECS. One of the great limitations is the soil moisture level. The contaminants degradation highly relays on the growth of hydrocarbon degradation bacteria (HDB), but the growth of HDB highly correlate with the soil moisture level. The decrease of water content in soil can inhibit bacterial activities and lead to reduced performance of soil BECS. To our best knowledge, few studies investigated the methods to maintain soil BECS under unsaturated soil conditions. This study aims to find a practical approach to improve soil BECS performance under unsaturated soil conditions. As the bacterial activities mainly occur on the anode of the BECS, water retention layers were added around the anode of BECSs in this study. Hydrogel was selected as the water retention materials in this study because of its excellent water retention capacity. Four reactors were settled in this study: soil and hydrogel mixture water retention layer enhanced BECS reactor (SHB), graphite granule and hydrogel mixture layer enhanced BECS reactor (GHB), soil and BECS reactor (SB), and a control tank without BECS (Con). During the 110 days of study, all three BECSs showed great improvement on total petroleum hydrocarbon (TPH) degradation compare to the control. Among the three BECSs, SHB showed the best current production and TPH degradation. During each evaporation test that have been proceed, SHB maintained system performance 40% longer than the SB in unsaturated condition, and this extension increased to 90% compare to GHB. SHB also had the highest TPH removal (37% TPH removal by day 110) among the three BECSs, which is 42% higher than SB, 164% higher than GHB, and 517% higher than control. These result shows the feasibility to use hydrogel as a water retention material to enhance soil BECS performance under unsaturated soil conditions. Advisors/Committee Members: Zhiyong Jason. Ren, JoAnn Silverstein, Song Jin.

Subjects/Keywords: bioelectrochemical remediation; moisture retention material; petroleum hydrocarbon; unsaturated soil; hydrogel; Environmental Engineering; Soil Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cui, Y. (2017). Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/379

Chicago Manual of Style (16th Edition):

Cui, Yixiao. “Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions.” 2017. Masters Thesis, University of Colorado. Accessed January 20, 2020. https://scholar.colorado.edu/cven_gradetds/379.

MLA Handbook (7th Edition):

Cui, Yixiao. “Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions.” 2017. Web. 20 Jan 2020.

Vancouver:

Cui Y. Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions. [Internet] [Masters thesis]. University of Colorado; 2017. [cited 2020 Jan 20]. Available from: https://scholar.colorado.edu/cven_gradetds/379.

Council of Science Editors:

Cui Y. Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions. [Masters Thesis]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/cven_gradetds/379


University of Colorado

2. Cui, Yixiao. Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions.

Degree: MS, 2017, University of Colorado

Soil contamination has become a growing problem worldwide. Common soil remediation technologies including physical excavation, chemical oxidation or reduction are generally energy and chemical intensive. Compare to them, bioelectrochemical systems (BECSs) is a relatively cost-effective and environmentally friendly way to treat contaminated soil. Much work has been done using BECS on soil remediation, both in laboratory scales and in the field. But many limitations still restrict the application and development of soil BECS. One of the great limitations is the soil moisture level. The contaminants degradation highly relays on the growth of hydrocarbon degradation bacteria (HDB), but the growth of HDB highly correlate with the soil moisture level. The decrease of water content in soil can inhibit bacterial activities and lead to reduced performance of soil BECS. To our best knowledge, few studies investigated the methods to maintain soil BECS under unsaturated soil conditions. This study aims to find a practical approach to improve soil BECS performance under unsaturated soil conditions. As the bacterial activities mainly occur on the anode of the BECS, water retention layers were added around the anode of BECSs in this study. Hydrogel was selected as the water retention materials in this study because of its excellent water retention capacity. Four reactors were settled in this study: soil and hydrogel mixture water retention layer enhanced BECS reactor (SHB), graphite granule and hydrogel mixture layer enhanced BECS reactor (GHB), soil and BECS reactor (SB), and a control tank without BECS (Con). During the 110 days of study, all three BECSs showed great improvement on total petroleum hydrocarbon (TPH) degradation compare to the control. Among the three BECSs, SHB showed the best current production and TPH degradation. During each evaporation test that have been proceed, SHB maintained system performance 40% longer than the SB in unsaturated condition, and this extension increased to 90% compare to GHB. SHB also had the highest TPH removal (37% TPH removal by day 110) among the three BECSs, which is 42% higher than SB, 164% higher than GHB, and 517% higher than control. These result shows the feasibility to use hydrogel as a water retention material to enhance soil BECS performance under unsaturated soil conditions. Advisors/Committee Members: Zhiyong Jason. Ren, JoAnn Silverstein, Song Jin.

Subjects/Keywords: bioelectrochemical remediation; moisture retention material; petroleum hydrocarbon; unsaturated soil; Environmental Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cui, Y. (2017). Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/105

Chicago Manual of Style (16th Edition):

Cui, Yixiao. “Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions.” 2017. Masters Thesis, University of Colorado. Accessed January 20, 2020. https://scholar.colorado.edu/cven_gradetds/105.

MLA Handbook (7th Edition):

Cui, Yixiao. “Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions.” 2017. Web. 20 Jan 2020.

Vancouver:

Cui Y. Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions. [Internet] [Masters thesis]. University of Colorado; 2017. [cited 2020 Jan 20]. Available from: https://scholar.colorado.edu/cven_gradetds/105.

Council of Science Editors:

Cui Y. Moisture Retention Materials Enhance Bioelectrochemical Remediation of Hydrocarbon-Contaminated Soil in Unsaturated Conditions. [Masters Thesis]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/cven_gradetds/105


University of Colorado

3. Leite Lobo, Fernanda. Energy Management of Microbial Fuel Cells for High Efficiency Wastewater Treatment and Electricity Generation.

Degree: PhD, 2018, University of Colorado

In order to develop communities in a sustainable manner it is necessary to think about how to provide basic and affordable services including sanitation and electricity. Wastewater has energy embedded in the form biodegradable organic matter, but most of the conventional systems use external energy to treat the wastewater instead of harvest its energy. Microbial fuel cells (MFCs) are unique systems that are capable of converting chemical energy of biodegradable substrates embedded in the waste materials into renewable electricity. Even though the technology showed great progress, the direct electrical energy output from MFC reactors is still very low and the electrical interface with microbial activities is not well understood. In this work, I investigated the development and deployment of energy management systems to improve energy harvesting of microbial fuel cells during wastewater treatment. The specific studies presented in this dissertation consist of the first AC power generation from microbial fuel cells, the development of harvesting strategies to maximize microbial fuel cell performance in different conditions, and the understanding of microbial community and activities under different harvesting conditions. To enable the application of MFC technology for treating actual wastewaters and providing net electricity output, I also investigated the integration of AC-powered electrocoagulation with granular biochar to treat hydraulic fracturing water, and I used the electricity generated by MFCs to directly power electrocoagulation for oily wastewater treatment, achieving energy positive wastewater treatment for distributed applications. System scale up and integration will be next steps for technology development. Advisors/Committee Members: Zhiyong "Jason" Ren, Mark Hernandez, JoAnn Silverstein, Rita Klees, Jae-Do Park.

Subjects/Keywords: electroactive bacteria; electrocoagulation; energy harvesting; microbial community; microbial fuel cell; wastewater treatment; Environmental Engineering; Power and Energy; Sustainability

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Leite Lobo, F. (2018). Energy Management of Microbial Fuel Cells for High Efficiency Wastewater Treatment and Electricity Generation. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/372

Chicago Manual of Style (16th Edition):

Leite Lobo, Fernanda. “Energy Management of Microbial Fuel Cells for High Efficiency Wastewater Treatment and Electricity Generation.” 2018. Doctoral Dissertation, University of Colorado. Accessed January 20, 2020. https://scholar.colorado.edu/cven_gradetds/372.

MLA Handbook (7th Edition):

Leite Lobo, Fernanda. “Energy Management of Microbial Fuel Cells for High Efficiency Wastewater Treatment and Electricity Generation.” 2018. Web. 20 Jan 2020.

Vancouver:

Leite Lobo F. Energy Management of Microbial Fuel Cells for High Efficiency Wastewater Treatment and Electricity Generation. [Internet] [Doctoral dissertation]. University of Colorado; 2018. [cited 2020 Jan 20]. Available from: https://scholar.colorado.edu/cven_gradetds/372.

Council of Science Editors:

Leite Lobo F. Energy Management of Microbial Fuel Cells for High Efficiency Wastewater Treatment and Electricity Generation. [Doctoral Dissertation]. University of Colorado; 2018. Available from: https://scholar.colorado.edu/cven_gradetds/372

.