Journal
BIORESOURCE TECHNOLOGY
Volume 251, Issue -, Pages 341-349Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.12.073
Keywords
One-stage partial nitritation-anammox; Sewage; Nitrate accumulation; Nitrite-oxidizing bacteria; Free nitrous acid
Funding
- National Natural Science Foundation of China [51608013, 21777005]
- 111 Project [D16003]
- Funding Projects of Beijing Municipal Commission of Education
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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.
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