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Long term partial nitritation of anaerobically treated black water and the emission of nitrous oxide.
- Source :
-
Water research [Water Res] 2010 Apr; Vol. 44 (7), pp. 2171-8. Date of Electronic Publication: 2010 Jan 04. - Publication Year :
- 2010
-
Abstract
- Black water (toilet water) contains half the load of organic material and the major fraction of the nutrients nitrogen and phosphorus in a household and is 25 times more concentrated, when collected with a vacuum toilet, than the total wastewater stream from a Dutch household. This research focuses on the partial nitritation of anaerobically treated black water to produce an effluent suitable to feed to the anammox process. Successful partial nitritation was achieved at 34 degrees C and 25 degrees C and for a long period (almost 400 days in the second period at 25 degrees C) without strict process control a stable effluent at a ratio of 1.3 NO(2)-N/NH(4)-N was produced which is suitable to feed to the anammox process. Nitrite oxidizers were successfully outcompeted due to inhibition by free ammonia and nitrous acid and due to fluctuating conditions in SRT (1.0-17 days) and pH (from 6.3 to 7.7) in the reactor. Microbial analysis of the sludge confirmed the presence of mainly ammonium oxidizers. The emission of nitrous oxide (N(2)O) is of growing concern and it corresponded to 0.6-2.6% (average 1.9%) of the total nitrogen load.<br /> (Copyright (c) 2009 Elsevier Ltd. All rights reserved.)
- Subjects :
- Algorithms
Anaerobiosis
Bacteria classification
Bacteria genetics
Bacteria metabolism
Biodegradation, Environmental
Biomass
Bioreactors
Hydrogen-Ion Concentration
In Situ Hybridization, Fluorescence
Nitrites analysis
Nitrites metabolism
Nitrous Oxide metabolism
Organic Chemicals metabolism
Quaternary Ammonium Compounds analysis
Quaternary Ammonium Compounds metabolism
RNA, Ribosomal, 16S genetics
Sewage microbiology
Time Factors
Nitrous Oxide analysis
Organic Chemicals analysis
Sewage chemistry
Waste Disposal, Fluid methods
Subjects
Details
- Language :
- English
- ISSN :
- 1879-2448
- Volume :
- 44
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Water research
- Publication Type :
- Academic Journal
- Accession number :
- 20106499
- Full Text :
- https://doi.org/10.1016/j.watres.2009.12.039