Restoration of real sewage partial nitritation-anammox process from nitrate accumulation using free nitrous acid treatment

[Display omitted] •One-stage PN/A of real sewage was difficult to recovery from nitrate accumulation.•FNA treatment of flocculent sludge from IFAS could suppress NOB activity.•FNA-based sludge treatment could restore sewage PN/A and improve nitrogen removal.•FNA concentration of 1.35 mg/L and exposu...

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Bibliographic Details
Published in:Bioresource technology 2018-03, Vol.251, p.341-349
Main Authors: Wang, Zhibin, Zhang, Shujun, Zhang, Liang, Wang, Bo, Liu, Wenlong, Ma, Shuqing, Peng, Yongzhen
Format: Article
Language:English
Subjects:
Ammonium Compounds
Bioreactors
Free nitrous acid
Nitrate accumulation
Nitrates
Nitrite-oxidizing bacteria
Nitrites
Nitrogen
Nitrous Acid
One-stage partial nitritation-anammox
Sewage
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Summary:[Display omitted] •One-stage PN/A of real sewage was difficult to recovery from nitrate accumulation.•FNA treatment of flocculent sludge from IFAS could suppress NOB activity.•FNA-based sludge treatment could restore sewage PN/A and improve nitrogen removal.•FNA concentration of 1.35 mg/L and exposure time of 24 h are suggested. This study presented a strategy for recovering partial nitritation-anammox (PN/A) of real sewage from nitrate accumulation using free nitrous acid (FNA) treatment. Sewage PN/A was successfully achieved in an integrated fixed-film activated sludge (IFAS) reactor but effluent nitrate gradually increased. For recovering the system performance, flocculent sludge of the reactor was collected and treated with FNA of 1.35 mg/L for 24 h. After FNA treatment, effluent nitrate decreased from 17.6 to 6.1 mg/L with an increase of total nitrogen removal efficiency from 29.1% to 63.1% within 32 days. The improvement of nitrogen removal was mainly due to the selective suppression of FNA on nitrite-oxidizing bacteria. Its relative abundance decreased from 0.32% to 0.08% and the activity declined from 9.05 to 2.42 mg N/(g MLSS·h). Meanwhile, ammonium-oxidizing bacteria and anammox bacteria were barely affected. Overall, IFAS reactor combined with FNA treatment potentially provided a promising technology for stable operation of one-stage sewage PN/A.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2017.12.073