Effect of Organic Matter on the Performance and Microbial Ecology of a Mainstream Anammox Process

Many ecosystems are wholly microbial and the activities of microorganisms provide the biochemical foundation for plant and animal life. ‘Microbial ecology and evolution’ describes how plants depend upon the complex redox reactions of microbes that fertilize the soil by fixing nitrogen, converting nitrites to nitrates, enhancing the availability of phosphorus and trace elements, and recycling organic matter. Eukaryotic microorganisms are similarly plentiful and essential for the sustenance of plants and animals. Bacteria, archaea, and single-celled eukaryotes are the masters of the marine environment, harnessing the energy that supports complex ecological interactions between aquatic animals. Bacteria and archaea form 90% of the ocean biomass and surface waters are filled with eukaryotic algae.

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Operational mode affects the role of organic matter in granular anammox process

Bioresource Technology ◽

10.1016/j.biortech.2021.125337 ◽

2021 ◽

pp. 125337

Author(s):

Dong Li ◽

Ziqing Wei ◽

Shuai Li ◽

Wenqiang Wang ◽

Huiping Zeng ◽

...

Keyword(s):

Organic Matter ◽

Operational Mode ◽

Anammox Process

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The SHARON process in the treatment of landfill leachate

Water Science & Technology ◽

10.2166/wst.2010.786 ◽

2010 ◽

Vol 61 (1) ◽

pp. 47-52 ◽

Cited By ~ 23

Author(s):

A. Vilar ◽

M. Eiroa ◽

C. Kennes ◽

M. C. Veiga

Keyword(s):

Organic Matter ◽

Landfill Leachate ◽

Previous Treatment ◽

Cod Removal ◽

Partial Nitrification ◽

Ammonium Concentration ◽

Partial Nitritation ◽

Pre Treatment ◽

Anammox Process ◽

Sharon Process

The purpose of this paper was to study the partial nitrification of the nitrogen present in a landfill leachate applying the SHARON process in order to obtain a suitable effluent to the ANAMMOX process. As a first step, the SHARON reactor was fed anaerobically pre-treated leachate at an ammonium concentration of 2,000 mg N/L (1.1 kg N/m3 d). In such conditions, the average ammonium and nitrite concentrations in the effluent were 775 mg N/L and 1,225 mg N/L, respectively. During this period the COD removal was very low since most of the biodegradable organic matter was removed in the anaerobic pre-treatment. Afterwards, the SHARON reactor was fed leachate without a previous treatment and the efficiency of the partial nitritation diminished. As well, the COD removal increased, achieving a percentage around 28%.

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Heterotrophic denitrification on granular anammox SBR treating urban landfill leachate

Water Science & Technology ◽

10.2166/wst.2008.544 ◽

2008 ◽

Vol 58 (9) ◽

pp. 1749-1755 ◽

Cited By ~ 73

Author(s):

M. Ruscalleda ◽

H. López ◽

R. Ganigué ◽

S. Puig ◽

M. D. Balaguer ◽

...

Keyword(s):

Organic Matter ◽

Nitrogen Removal ◽

Landfill Leachate ◽

Anammox Bacteria ◽

Partial Nitritation ◽

Nitrogen Consumption ◽

The Stability ◽

Anammox Process ◽

Heterotrophic Denitrification ◽

Biodegradable Organic Matter

The anammox process was applied to treat urban landfill leachate coming from a previous partial nitritation process. In presence of organic matter, the anammox process could coexist with heterotrophic denitrification. The goal of this study was to asses the stability of the anammox process with simultaneous heterotrophic denitrification treating urban landfill leachate. The results achieved demonstrated that the anammox process was not inactivated by heterotrophic denitrification. Moreover, part of the nitrate produced by anammox bacteria and part of the influent nitrite were removed by heterotrophic denitrifiers with associated biodegradable organic matter consumption. In this sense, the contribution on nitrogen removal of each process was calculated using a nitrogen mass balance methodology. An 85.1±5.6% of the nitrogen consumption was achieved via anammox process while the average heterotrophic denitrifiers contribution was 14.9±5.6%. Heterotrophic denitrification was limited by the available easily biodegradable organic matter.

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What is recalcitrant soil organic matter?

Environmental Chemistry ◽

10.1071/en10006 ◽

2010 ◽

Vol 7 (4) ◽

pp. 320 ◽

Cited By ~ 196

Author(s):

Markus Kleber

Keyword(s):

Organic Matter ◽

Soil Organic Matter ◽

Microbial Ecology ◽

Organic Molecules ◽

Global Scale ◽

Critical Discussion ◽

Environmental Drivers ◽

Microbial Decomposition ◽

Decomposition Of Organic Matter ◽

Logistical Problem

Environmental context.On a global scale, soils store more carbon than plants or the atmosphere. The cycling of this vast reservoir of reduced carbon is closely tied to variations in environmental conditions, but robust predictions of climate–carbon cycle feedbacks are hampered by a lack of mechanistic knowledge regarding the sensitivity of organic matter decomposition to rising temperatures. This text provides a critical discussion of the practice to conceptualise parts of soil organic matter as intrinsically resistant to decomposition or ‘recalcitrant’. Abstract.The understanding that some natural organic molecules can resist microbial decomposition because of certain molecular properties forms the basis of the biogeochemical paradigm of ‘intrinsic recalcitrance’. In this concept paper I argue that recalcitrance is an indeterminate abstraction whose semantic vagueness encumbers research on terrestrial carbon cycling. Consequently, it appears to be advantageous to view the perceived ‘inherent resistance’ to decomposition of some forms of organic matter not as a material property, but as a logistical problem constrained by (i) microbial ecology; (ii) enzyme kinetics; (iii) environmental drivers; and (iv) matrix protection. A consequence of this view would be that the frequently observed temperature sensitivity of the decomposition of organic matter must result from factors other than intrinsic molecular recalcitrance.

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