Comparison of biological removal via nitrite with real-time control using aerobic granular sludge and flocculent activated sludge View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2011-03

AUTHORS

Dawen Gao, Xiangjuan Yuan, Hong Liang, Wei-Min Wu

ABSTRACT

The process of nitrification-denitrification via nitrite for nitrogen removal under real-time control mode was tested in two laboratory-scale sequencing batch reactors (SBRs) with flocculent activated sludge (R1) and aerobic granular sludge (R2) to compare operational performance and real-time control strategies. The results showed that the average ammonia nitrogen, total inorganic nitrogen (TIN), and chemical oxygen demand (COD) removal during aeration phase were 97.6%, 57.0%, and 90.1% in R2 compared with 98.6%, 48.7%, and 88.1% in R1. The TIN removed in both SBRs was partially due to the presence of simultaneous nitrification-denitrification via nitrite, especially in R2. The specific nitrification and denitrification rates in R2 were 0.0416 mg NH₄+ -N/gSS-min and 0.1889 mg NO X)⁻-N/gSS-min, which were 1.48 times and 1.35 times that of R1. The higher rates for COD removal, nitrification, and denitrification were achieved in R2 than R1 with similar influent quality. Dissolved oxygen (DO), pH, and oxidization reduction potential, corresponding to nutrient variations, were used as diagnostic parameters to control the organic carbon degradation and nitrification-denitrification via nitrite processes in both SBRs. The online control strategy of granular SBR was similar to that of the SBR with flocculent activated sludge. However, a unique U-type pattern on the DO curve in granular SBR was different from SBR with flocculent activated sludge in aerobic phase. More... »

PAGES

1645-1652

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00253-010-2950-3

DOI

http://dx.doi.org/10.1007/s00253-010-2950-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1029547828

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/20972676


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