Journal
ENVIRONMENTAL ENGINEERING SCIENCE
Volume 36, Issue 12, Pages 1482-1490Publisher
MARY ANN LIEBERT, INC
DOI: 10.1089/ees.2019.0294
Keywords
anammox; biofilm; corncob; denitrification; nitrite inhibition; performance robustness
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Funding
- National Natural Science Foundation of China [51878232]
- Major Science and Technology Research Project in Anhui Province [2017YF-05]
- Foundation of Anhui Shun Yu Water Co., Ltd. [W2018JSKF0137]
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Biofilm carriers play an important role in attached growth systems for wastewater treatment processes. In this study, to establish a more robust and efficient anammox system, corncobs were used as biofilm carriers in the anammox process to tackle nitrite inhibition and enhance nitrogen removal. Results indicated that the nitrite- and nitrate-denitrifying activities of the corncob biofilm were 32% and 26%, respectively, higher than that of bulk sludge when adopting synthetic wastewater as influent that only contained NH4+-N and NO2--N. The higher nitrite-denitrifying activity of the corncob biofilm had a positive effect on alleviation of nitrite inhibition. Furthermore, the corncob anammox system reached similar to 92.5% total nitrogen (TN) removal stably, and the anammox pathway played a dominant role by carrying out more than 90% of TN removal. Anammox bacteria coexisted stably with the denitrifiers in the corncob biofilm, in which the anammox activity and denitrifying activity were 42.46 +/- 0.58mg NH4+-N d(-1) and 10.28 +/- 0.02mg NO3--N d(-1), respectively. Therefore, employing corncobs as biofilm carriers was a useful and applicable supplement for enhancing the performance robustness of the anammox process.
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