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Denitrifying sulfur conversion-associated EBPR: Effects of temperature and carbon source on anaerobic metabolism and performance
Guo, Gang1,2; Wu, Di1,2,3; Ekama, George A.4; Hao, Tianwei1,5; Mackey, Hamish Robert6; Chen, Guanghao1,2,3
2018-09-15
Source PublicationWater Research
ISSN0043-1354
Volume141Pages:9-18
Abstract

The recently developed Denitrifying Sulfur conversion-associated Enhanced Biological Phosphorus Removal (DS-EBPR) process has demonstrated simultaneous removal of organics, nitrogen and phosphorus with minimal sludge production in the treatment of saline/brackish wastewater. Its performance, however, is sensitive to operating and environmental conditions. In this study, the effects of temperature (20, 25, 30 and 35 degrees C) and the ratio of influent acetate to propionate (100-0, 75-25, 50-50, 25-75 and 0 - 100%) on anaerobic metabolism were investigated, and their optimal values/controls for performance optimization were identified. A mature DS-EBPR sludge enriched with approximately 30% sulfate reducing bacteria (SRB) and 33% sulfide-oxidizing bacteria (SOB) was used in this study. The anaerobic stoichiometry of this process was insensitive to temperature or changes in the carbon source. However, an increase in temperature from 20 to 35 degrees C accelerated the kinetic reactions of the functional bacteria (i.e. SRB and SOB) and raised the energy requirement for their anaerobic maintenance, while a moderate temperature (25-30 degrees C) resulted in better P removal (>= 93%,18.6 mg P/L removal from total 20 mg P/L in the influent) with a maximum sulfur conversion of approximately 16 mg S/L. These results indicate that the functional bacteria are likely to be mesophilic. When a mixed carbon source (75-25 and 50-50% acetate to propionate ratios) was supplied, DS-EBPR achieved a stable P removal (>= 89%, 17.8 mg P/L for 400 mg COD/L in the influent) with sulfur conversions at around 23 mg S/L, suggesting the functional bacteria could effectively adapt to changes in acetate or propionate as the carbon source. The optimal temperatures or carbon source conditions maximized the functional bacteria competition against glycogen-accumulating organisms by favoring their activity and synergy. Therefore, the DS-EBPR process can be optimized by setting the temperature in the appropriate range (25-30 degrees C) and/or manipulating influent carbon sources.

KeywordSulfur Conversion Enhanced Biological Phosphorus Removal Anaerobic Metabolism Optimization Temperature Carbon Source
DOIhttps://doi.org/10.1016/j.watres.2018.04.028
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering ; Environmental Sciences & Ecology ; Water Resources
WOS SubjectEngineering, Environmental ; Environmental Sciences ; Water Resources
WOS IDWOS:000439403000002
PublisherPERGAMON-ELSEVIER SCIENCE LTD
The Source to ArticleWOS
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Cited Times [WOS]:5   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorWu, Di; Chen, Guanghao
Affiliation1.Department of Civil & Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
2.Hong Kong Branch of the Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Hong Kong, China
3.Wastewater Treatment Laboratory, FYT Graduate School, The Hong Kong University of Science and Technology, Nansha, Guangzhou, China
4.Water Research Group, Department of Civil Engineering, University of Cape Town, Cape Town, South Africa
5.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China
6.Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
Recommended Citation
GB/T 7714
Guo, Gang,Wu, Di,Ekama, George A.,et al. Denitrifying sulfur conversion-associated EBPR: Effects of temperature and carbon source on anaerobic metabolism and performance[J]. Water Research,2018,141:9-18.
APA Guo, Gang,Wu, Di,Ekama, George A.,Hao, Tianwei,Mackey, Hamish Robert,&Chen, Guanghao.(2018).Denitrifying sulfur conversion-associated EBPR: Effects of temperature and carbon source on anaerobic metabolism and performance.Water Research,141,9-18.
MLA Guo, Gang,et al."Denitrifying sulfur conversion-associated EBPR: Effects of temperature and carbon source on anaerobic metabolism and performance".Water Research 141(2018):9-18.
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