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Restoration of real sewage partial nitritation-anammox process from nitrate accumulation using free nitrous acid treatment.
- Source :
-
Bioresource Technology . Feb2018, Vol. 251, p341-349. 9p. - Publication Year :
- 2018
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SEWAGE purification
*NITRATES
*NITROUS acid
*SEWAGE sludge
*SLUDGE management
Subjects
Details
- Language :
- English
- ISSN :
- 09608524
- Volume :
- 251
- Database :
- Academic Search Index
- Journal :
- Bioresource Technology
- Publication Type :
- Academic Journal
- Accession number :
- 128073265
- Full Text :
- https://doi.org/10.1016/j.biortech.2017.12.073