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Modeling VOC Emissions in the High-Purity Oxygen Activated Sludge Process |
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| Authors: | Pan Jiang Chwen-Jeng Tzeng Chu-Chin Hsieh Michael K. Stenstrom |
| Affiliation: | 1Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, Los Angeles, CA 90095-1598. 2Technical Manager, CECI Engineering Consultants, Inc., Taipei, Taiwan. 3Professor, Dept. of Environmental and Safety Engineering, National Yunlin Univ., Yunlin, Taiwan. 4Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, Los Angeles, CA 90095-1598 (corresponding author). |
| Abstract: | Mass balances for volatile organic compounds (VOCs) were added to a structured mathematical model of the high-purity oxygen activated sludge (HPO-AS) process. The model was sized to correspond to two large existing HPO-AS treatment plants. The stripping of ten different VOCs was modeled and compared to stripping from conventional air activated sludge process. The results show that the covered aeration tanks can reduce stripping by more than 90%, depending on the specific VOC. If biodegradation is considered, the HPO-AS process degrades more than the conventional process due to the higher liquid-phase concentrations that result because of reduced stripping. The increase in biodegradation depends on the VOCs degradability but should increase to nearly 100% for highly volatile but biodegradable VOCs. |
| Keywords: | Activated sludge Aeration Mathematical models Oxygen transfer Organic compounds Wastewater management |