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Optimizing granulation of a sulfide-based autotrophic denitrification (SOAD) sludge: Reactor configuration and mixing mode
Guo, Gang1; Hao, Tianwei2
2021-01
Source PublicationScience of the Total Environment
ISSN0048-9697
Volume750Pages:141626
Abstract

Challenges such as long-term cultivation and sludge floatation are common in flocculent sulfide-oxidizing autotrophic denitrification (SOAD) systems. The present study aims to optimize the granulation of SOAD sludge by mainly adjusting the reactor configuration and mixing mode. Three liquid-lift upflow reactors viz. a reactor equipped with a three-phase separator (Reactor A), a modified version of Reactor A equipped with a hydraulic regulator (Reactor B), and a reactor with a mounted baffle and intermittent mechanical mixing (Reactor C). These reactors were operated for more than 160 days. The results showed that dense and compact granules with 200 μm of diameter developed within 40 days and gradually increased to approximately 400 μm in Reactor C, which had a volatile suspended solids (VSS) concentration of 7500 mg VSS/L of sludge concentration; this Reactor C was also subject to modified reactor configuration and operating conditions. In comparison, filamentous granules formed in Reactor A due to a low substrate loading and granules formed in Reactor B but with significant biomass loss caused by sludge flotation. Both of the reactors only have ≤1000 mg VSS/L VS 7500 mg VSS/L in Reactor C. Also, Reactor C having 0.77 h of hydraulic retention time (HRT) and 0.94 kgNO-N/m d & 1.87 kgS-S/m d of nitrogen and sulfide loading rate, respectively, showed a better performance in terms of nitrate removal (89%) and sulfur conversion (above 70%) due to its enrichment by the typical autotrophic denitrifiers (39.0% of Thiobacillus, 22.4% of Sulfurimonas) in the granules. Our findings provide a method to optimize the design and operation of granulation reactors that can be extended to similar processes treating organic-deficient wastewaters.

KeywordFilamentous Growth Granulation Optimization Sludge Flotation Sulfide-oxidizing Autotrophic Denitrification
DOI10.1016/j.scitotenv.2020.141626
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000585694600067
PublisherElsevier B.V.
Scopus ID2-s2.0-85089822055
Fulltext Access
FWCI0.32182255
Citation statistics
Document TypeJournal article
CollectionFaculty of Science and Technology
DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorHao, Tianwei
Affiliation1.School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan, 430074, China
2.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Guo, Gang,Hao, Tianwei. Optimizing granulation of a sulfide-based autotrophic denitrification (SOAD) sludge: Reactor configuration and mixing mode[J]. Science of the Total Environment,2021,750:141626.
APA Guo, Gang,&Hao, Tianwei.(2021).Optimizing granulation of a sulfide-based autotrophic denitrification (SOAD) sludge: Reactor configuration and mixing mode.Science of the Total Environment,750,141626.
MLA Guo, Gang,et al."Optimizing granulation of a sulfide-based autotrophic denitrification (SOAD) sludge: Reactor configuration and mixing mode".Science of the Total Environment 750(2021):141626.
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