Effect of Carbon Source on Biological Nutrient Removal in an Anaerobic, Hypoxic, Anoxic, or Aerobic Sequencing Batch Reactor

AbstractA sequencing batch reactor was constructed to realize simultaneous nitrification and denitrification (SND) and denitrifying phosphorus removal (DPR). The influence of different carbon sources (acetate, acetate and propionate, and propionate) was explored. The total nitrogen (TN) removal effi...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 2021-12, Vol.147 (12)
Main Authors: Lu, Yong-Ze, Yin, Yue, Xu, Li-Ran, Li, Xin, Zhu, Guang-Can
Format: Article
Language:English
Subjects:
Acetic acid
Batch reactors
Bioaccumulation
Carbon
Carbon sources
Competitiveness
Denitrification
Enzymatic activity
Glycogen
Glycogens
Hypoxia
Metabolism
Microorganisms
Nitrification
Nutrient removal
Phosphorus
Phosphorus removal
Propionic acid
Reactors
Sequencing batch reactor
Technical Papers
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Summary:AbstractA sequencing batch reactor was constructed to realize simultaneous nitrification and denitrification (SND) and denitrifying phosphorus removal (DPR). The influence of different carbon sources (acetate, acetate and propionate, and propionate) was explored. The total nitrogen (TN) removal efficiency reached the highest value of 66.4% with acetate. The total phosphorus (TP) removal efficiency was nearly the same (97.9%–96.1%) with different carbon sources. Propionate facilitates TP removal during the hypoxic stage to weaken glycogen metabolism in phosphorus-accumulating organisms (PAOs) and promote dehydrogenase and phosphorus removal–related enzyme activities. Propionate also facilitates the competitiveness of PAOs against glycogen-accumulating organisms (GAOs). TN removal during the SND process in the hypoxic stage was maintained at 38.2%–40.2%, which is explained by the relative amount of change in nitrifying and denitrifying microorganisms. However, acetate promoted TN (from 9.2% to 17.3%) and TP (from 18.1% to 22.7%) removal during the DPR stage, thus enhancing final TN removal and maintaining TP removal. Consequently, acetate may be a better choice for a SND-DPR–coupled system.
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)EE.1943-7870.0001944