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Improved anaerobic co-digestion of foodwaste and domesticwastewater by copper supplementation – Microbial community change and enhanced effluent quality
Pak Chuen Chan1; Qihong Lu1,2; Renata Alves de Toledo1; Ji-Dong Gu3; Hojae Shim1
2019-03-08
Source PublicationScience of the Total Environment
ISSN0048-9697
Volume670Issue:2019Pages:337-344
Abstract

Anaerobic co-digesters are biorefineries for energy recovery from food waste and domestic wastewater via methane production. Nonetheless, the performance of this technology was not always satisfied due to the long chain fatty acids (LCFAs) generation from food waste. Micronutrient supplementation is an effective strategy that could be applied during the anaerobic (co-)digestion to further enhance the digestion efficiency while treating food waste. In this study, supplementing copper (as CuSO4 and CuCl2) at 10, 30, and 50 mg/L Cu2+ was selected to further enhance the methane production of anaerobic codigester
while treating food waste and domestic wastewater. Overall, with the supplementation of copper, the chemical oxygen demand (COD) removal efficiency was over 90%, while higher methane yields (0.260–0.325 L CH4/g COD removed) were obtained compared to the control without supplementation (0.175 L CH4/g COD removed). For the cumulative methane yield, the highest increment of 94.1% was obtained when 10 mg/L of Cu2+ were added. The results showed copper as a cofactor of many microbial enzymes and coenzymes involved in the methane production further improved both methane production and COD removal efficiency. Meanwhile, the microbial community analysis verified the copper supplementation significantly changed the bacterial communities but with the limited effect on the diversity of archaea. Furthermore, since the anaerobic co-digester was not that much efficient on the nutrients removal, the effluent from the upflow anaerobic sludge blanket (UASB) reactor was further treated by theanaerobic/anoxic/oxic (A2O) rector and the resulting effluent reached the satisfying quality in terms of COD, total nitrogen (TN), and NH3-N removal, meeting the regional effluent discharge limits.

KeywordAnaerobic Co-digestion Copper Supplementation Methane Production Microbial Community Change Uasb Reactor
DOIhttps://doi.org/10.1016/j.scitotenv.2019.03.081
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000464681800035
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Document TypeJournal article
专题Faculty of Science and Technology
DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorHojae Shim
Affiliation1.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau
2.School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China
3.School of Biological Sciences, The University of Hong Kong, Hong Kong, China
First Author AffilicationFaculty of Science and Technology
Corresponding Author AffilicationFaculty of Science and Technology
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Pak Chuen Chan,Qihong Lu,Renata Alves de Toledo,et al. Improved anaerobic co-digestion of foodwaste and domesticwastewater by copper supplementation – Microbial community change and enhanced effluent quality[J]. Science of the Total Environment,2019,670(2019):337-344.
APA Pak Chuen Chan,Qihong Lu,Renata Alves de Toledo,Ji-Dong Gu,&Hojae Shim.(2019).Improved anaerobic co-digestion of foodwaste and domesticwastewater by copper supplementation – Microbial community change and enhanced effluent quality.Science of the Total Environment,670(2019),337-344.
MLA Pak Chuen Chan,et al."Improved anaerobic co-digestion of foodwaste and domesticwastewater by copper supplementation – Microbial community change and enhanced effluent quality".Science of the Total Environment 670.2019(2019):337-344.
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