Biological Removal of Nitrogen from Wastewater

Zhu, Guibing; Peng, Yongzhen; Li, Baikun; Guo, Jianhua; Yang, Qing

doi:10.1007/978-0-387-71724-1_5

Cited by 259 publications

(151 citation statements)

References 153 publications

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“…In such oxygen-limited aggregates, cooperation between the ammonia-oxidizing prokaryotes can provide nitrite to anammox bacteria (Sliekers et al, 2002;Zhu et al, 2008;Yan et al, 2010). In this study, the nitrification rates in the deeper soil layers were always higher than the denitrification rates, indicating that partial nitrification processes might be the main source of nitrite for anammox, because 10 units of anammox need 10 units of nitrite and nitrification could supply 10, 12 or enough to sustain our measured rates.…”

Section: Discussionmentioning

confidence: 53%

Anaerobic ammonia oxidation in a fertilized paddy soil

et al. 2011

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Evidence for anaerobic ammonium oxidation in a paddy field was obtained in Southern China using an isotope-pairing technique, quantitative PCR assays and 16S rRNA gene clone libraries, along with nutrient profiles of soil cores. A paddy field with a high load of slurry manure as fertilizer was selected for this study and was shown to contain a high amount of ammonium (6.2-178.8 mg kg À1 ). The anaerobic oxidation of ammonium (anammox) rates in this paddy soil ranged between 0.5 and 2.9 nmolN per gram of soil per hour in different depths of the soil core, and the specific cellular anammox activity observed in batch tests ranged from 2.9 to 21 fmol per cell per day. Anammox contributed 4-37% to soil N2 production, the remainder being due to denitrification. The 16S rRNA gene sequences of surface soil were closely related to the anammox bacteria 'Kuenenia', 'Anammoxoglobus' and 'Jettenia'. Most of the anammox 16S rRNA genes retrieved from the deeper soil were affiliated to 'Brocadia'. The retrieval of mainly bacterial amoA sequences in the upper part of the paddy soil indicated that nitrifying bacteria may be the major source of nitrite for anammox bacteria in the cultivated horizon. In the deeper oxygen-limited parts, only archaeal amoA sequences were found, indicating that archaea may produce nitrite in this part of the soil. It is estimated that a total loss of 76 g N m À2 per year is linked to anammox in the paddy field.

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Section: Discussionmentioning

confidence: 53%

Anaerobic ammonia oxidation in a fertilized paddy soil

et al. 2011

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“…As we understand the processes now, there is no, or at least lower, N 2 O emission via the anammox or ANME coupled to denitrification pathway, which is another great advantage over conventional nitrification and denitrification (Kampschreur et al 2008;Zhu et al 2008). Therefore, the ratio of anammox to conventional nitrification/denitrification could influence net fluxes of these trace gases, with ramifications for global warming and the catalytic destruction of ozone in the stratosphere.…”

Section: Potential Relationship To Nitrous Oxide (N 2 O) Emissionsmentioning

confidence: 99%

Potential roles of anaerobic ammonium and methane oxidation in the nitrogen cycle of wetland ecosystems

Zhu

Jetten

Kuschk

et al. 2010

Appl Microbiol Biotechnol

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Anaerobic ammonium oxidation (anammox) and anaerobic methane oxidation (ANME coupled to denitrification) with nitrite as electron acceptor are two of the most recent discoveries in the microbial nitrogen cycle. Currently the anammox process has been relatively well investigated in a number of natural and man-made ecosystems, while ANME coupled to denitrification has only been observed in a limited number of freshwater ecosystems. The ubiquitous presence of anammox bacteria in marine ecosystems has changed our knowledge of the global nitrogen cycle. Up to 50% of N 2 production in marine sediments and oxygendepleted zones may be attributed to anammox bacteria. However, there are only few indications of anammox in natural and constructed freshwater wetlands. In this paper, the potential role of anammox and denitrifying methanotrophic bacteria in natural and artificial wetlands is discussed in relation to global warming. The focus of the review is to explore and analyze if suitable environmental conditions exist for anammox and denitrifying methanotrophic bacteria in nitrogen-rich freshwater wetlands.

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“…SND is of particular interest in saving anoxic volume and in treatment wastewaters with low C:N ratio (Zhu et al, 2007b). The mechanism and explanation for SND can be divided into two broad categories.…”

Section: Introductionmentioning

confidence: 99%

“…The biological explanations for SND are in contrast to the traditional "engineering" conception of nitrification and denitrification. Microbiologists have reported the existence of aerobic denitrifiers as well as heterotrophic nitrifiers (Kim et al, 2005;Zhu et al, 2007b).…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

Zhu

Peng

et al. 2007

Journal of Environmental Sciences

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The simultaneous nitrification and denitrification in step-feeding biological nitrogen removal process were investigated under different influent substrate concentrations and aeration flow rates. Biological occurrence of simultaneous nitrification and denitrification was verified in the aspect of nitrogen mass balance and alkalinity. The experimental results also showed that there was a distinct linear relationship between simultaneous nitrification and denitrification and DO concentration under the conditions of low and high aeration flow rate. In each experimental run the floc sizes of activated sludge were also measured and the results showed that simultaneous nitrification and denitrification could occur with very small size of floc.

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Biological Removal of Nitrogen from Wastewater

Cited by 259 publications

References 153 publications

Anaerobic ammonia oxidation in a fertilized paddy soil

Anaerobic ammonia oxidation in a fertilized paddy soil

Potential roles of anaerobic ammonium and methane oxidation in the nitrogen cycle of wetland ecosystems

Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

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