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
Corresponding AuthorWu,Di
Source PublicationWater Research
ISSN18792448 00431354
AbstractThe 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 °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 °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 °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 °C) and/or manipulating influent carbon sources.
KeywordAnaerobic metabolism Carbon source Enhanced biological phosphorus removal Optimization Sulfur conversion Temperature
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Document TypeJournal article
Personal research not belonging to the institution
Affiliation1.Department of Civil & Environmental EngineeringThe Hong Kong University of Science and Technology,Hong Kong
2.Hong Kong Branch of the Chinese National Engineering Research Center for Control & Treatment of Heavy Metal PollutionThe Hong Kong University of Science and Technology,Hong Kong
3.Wastewater Treatment LaboratoryFYT Graduate SchoolThe Hong Kong University of Science and Technology,Guangzhou,Hong Kong
4.Water Research GroupDepartment of Civil EngineeringUniversity of Cape Town,Cape Town,South Africa
5.Department of Civil and Environmental EngineeringFaculty of Science and TechnologyUniversity of Macau,Macau,China
6.Division of Sustainable DevelopmentCollege of Science and EngineeringHamad Bin Khalifa UniversityQatar Foundation,Doha,Qatar
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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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