Electrochemical sulfur recovery from sulfide-containing wastewaters
Abstract/Contents
- Abstract
- Shifting paradigms from wastewater treatment to resource recovery requires innovative processes for converting contaminants to products to address water scarcity, combat resource depletion, and promote circular economies. Sulfide, a contaminant in wastewater, can be recovered as sulfur-containing products that add value to various industrial manufacturing processes. Electrochemical sulfur recovery from wastewaters exhibits advantages in terms of modularity and tunability, but further insights are required to transform this opportunity into a robust and stable practice that yields a diverse portfolio of recovered sulfur products from wastewaters. Therefore, this dissertation explores mechanistic- and process- level understanding of both bulk and interfacial reactions during electrochemical sulfur recovery to guide the design and optimization of process with enhanced performance and feasibility. Specifically, the rate-limiting steps and reaction barriers of electrochemical sulfide oxidation were identified by product quantification and electrode characterization. Then, the performance of electrochemical sulfate production was evaluated in a broad range of sulfide-containing wastewaters. Integration of sulfate production and nitrogen recovery was also demonstrated via electrochemical stripping. Finally, gas evolution reactions at electrode-electrolyte interfaces were probed using scanning electrochemical microscopy to inform electrode design for electrochemical sulfur recovery and, more broadly, for electrochemical water treatment. The insights from this dissertation will advance water reuse and a circular sulfur economy by enabling sulfur recovery and informing the incorporation of electrochemical unit processes into wastewater treatment trains.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2024; ©2024 |
| Publication date | 2024; 2024 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Shao, Xiaohan |
|---|---|
| Degree supervisor | Tarpeh, William |
| Thesis advisor | Tarpeh, William |
| Thesis advisor | Criddle, Craig |
| Thesis advisor | Mitch, William A |
| Degree committee member | Criddle, Craig |
| Degree committee member | Mitch, William A |
| Associated with | Stanford University, School of Engineering |
| Associated with | Stanford University, Civil & Environmental Engineering Department |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Xiaohan Shao. |
|---|---|
| Note | Submitted to the Civil & Environmental Engineering Department. |
| Thesis | Thesis Ph.D. Stanford University 2024. |
| Location | https://purl.stanford.edu/nt015vx1239 |
Access conditions
- Copyright
- © 2024 by Xiaohan Shao
- License
- This work is licensed under a Creative Commons Attribution Non Commercial No Derivatives 3.0 Unported license (CC BY-NC-ND).
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