Type of Document Thesis Author Thomas, Dornelle S URN etd-05292007-203838 Title Reducing Hydrogen Sulfide (H2S) Concentrations at Wastewater Collection Systems and Treatment Facilities using Chemical Oxidation Degree Master of Science Department Civil and Environmental Engineering, Department of Advisory Committee
Advisor Name Title Amy Chan Hilton Committee Chair Gang Chen Committee Member Tarek Abichou Committee Member Keywords
- Wastewater Collection Systems
- Anaerobic Digestion
- Wastewater Treatment
Date of Defense 2007-04-30 Availability unrestricted AbstractWastewater collection systems and treatment facilities are known for emitting offensive odors that cause neighboring residents to complain. One of the main odor compound contributors is hydrogen sulfide (H2S). Presently, H2S removal from wastewater facilities is mainly being accomplished by biological means relying heavily on the use of microorganisms. However, the use of microorganisms requires a more consistent and stable environment. In the absence of the previously stated conditions, the removal of H2S has to be carried out by other means. Therefore, an alternative for wastewaters with unstable characteristics requiring minimal maintenance/human involvement is preferred to deal with H2S emissions.
This study investigated the effectiveness of chemical oxidation by employing three oxidants, 50% hydrogen peroxide (H2O2), 12% sodium hypochlorite (NaOCl), and 5% potassium permanganate (KMnO4) at mitigating H2S aqueous and gas concentrations at wastewater collection systems and treatment facilities. The chemicals were supplied to the systems throughout four distinct testing phases using peristaltic pumps. H2S(g) levels were obtained using a Jerome Meter (860 model) while the dissolved sulfide concentrations were measured using a LaMotte Sulfide Test Kit.
This study found that of the three chemicals chosen, H2O2 is most effective and efficient at removing H2S from wastewater collection and treatment facilities. However, throughout this study, H2S(g) removal efficiencies were affected by the physical conditions at the testing facilities. Therefore, after taking the corrective action needed to improve facility conditions, further investigation is required to appropriately evaluate the use of H2O2 at odor mitigation.
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