Efficacies of Nitrogen Removal and Comparisons of Microbial Communities in Full-Scale (Pre-Anoxic Systems) Municipal Water Resource Recovery Facilities at Low and High COD:TN Ratios
Water
; 14(5):720, 2022.
Article
in English
| ProQuest Central | ID: covidwho-1742773
ABSTRACT
At a low CODTN ratio (≤5) in influent, maintaining a longer HRT (≥9 h) and longer SRT (≥30 d) are suggested to improve higher N removal efficiency in case of operation at low DO (Dissolved oxygen) level (0.9 ± 0.2 mg-O2/L). However, in case of operation at high DO level (4.0 ± 0.5 mg-O2/L), short HRT (1 h) and typical SRT (17 d) make it possible to achieve nitrogen removal. On the other hand, at a high CODTN ratio (≥8.4), a typical HRT (9–15 h), SRT (12–19 d), and DO level (1.3–2.6 mg-O2/L) would be applied. Microbial distribution analysis showed an abundance of AOA (Ammonia-oxidizing archaea) under conditions of low DO (≤0.9 mg-O2/L). Nitrosomonas sp. are mostly found in the all investigated water resource recovery facilities (WRRFs). Nitrosospira sp. are only found under operating conditions of longer SRT for WRRFs with a low CODTN ratio. In comparison between abundances of Nitrobacter sp. and Nitrospira sp., abundances of Nitrobacter sp. are proportional to low DO concentration rather than abundance of Nitrospira sp. A predominance of nosZ-type denitrifiers were found at low DO level. Abundance of denitrifiers by using nirS genes showed an over-abundance of denitrifiers by using nirK genes at low and high CODTN ratios.
Environmental Studies; pre-anoxic; COD:TN; nitrogen removal; microbial communities; Resource recovery; Genes; Municipal water; Anoxia; Chemical oxygen demand; Dissolved oxygen; Bacteria; Oxidation; Polymerase chain reaction; Influents; Recovery; COVID-19; Nitrogen; Microbial activity; Water quality; Water resources; Microorganisms; Airports; Recycling; Sludge; Carbon; Temperature; Abundance; Ammonia; Archaea; Nitrobacter; Nutrients; Removal; Ratios; United States--US; Nitrospira; Thailand
Full text:
Available
Collection:
Databases of international organizations
Database:
ProQuest Central
Language:
English
Journal:
Water
Year:
2022
Document Type:
Article
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