期刊
PROCESSES
卷 9, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/pr9020278
关键词
deammonification; thermal hydrolysis process; sidestream; hydrocyclone; partial nitritation/anammox
资金
- Thames Water
- EPSRC Centre for Doctoral Training in Engineering for the Water Sector (STREAM IDC) [EP/L015412/1]
This study aimed to optimize the operation and evaluate the performance of a full-scale S-CSTR with a hydrocyclone for AMX biomass separation. Results showed high nitrogen removal efficiency under different nitrogen loading rates, and the importance of SRT in NOB washout. The study also demonstrated the role of the hydrocyclone in maintaining AMX and process stability.
Suspended sludge deammonification technologies are frequently applied for sidestream ammonia removal from dewatering liquors resulting from a thermal hydrolysis anaerobic digestion (THP/AD) process. This study aimed at optimizing the operation, evaluate the performance and stability of a full-scale suspended sludge continuous stirred tank reactor (S-CSTR) with a hydrocyclone for anaerobic ammonia oxidizing bacteria (AMX) biomass separation. The S-CSTR operated at a range of nitrogen loading rates of 0.08-0.39 kg N m(-3) d(-1) displaying nitrogen removal efficiencies of 75-89%. The hydrocyclone was responsible for retaining 56-83% of the AMX biomass and the washout of ammonia oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) was two times greater than AMX. The solid retention time (SRT) impacted on NOB washout, that ranged from 0.02-0.07 d(-1). Additionally, it was demonstrated that an SRT of 11-13 d was adequate to wash-out NOB. Microbiome analysis revealed a higher AMX abundance (Candidatus scalindua) in the reactor through the action of the hydrocyclone. Overall, this study established the optimal operational envelope for deammonification from THP/AD dewatering liquors and the role of the hydrocyclone towards maintaining AMX in the S-CSTR and hence obtain process stability.
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