Oxygen-depletion by rapid ammonia oxidation regulates kinetics of N2O, NO and N2 production in an ammonium fertilised agricultural soil

2021 ◽  
Vol 163 ◽  
pp. 108460
Author(s):  
Liuqing Yang ◽  
Xiaojun Zhang ◽  
Xiaotang Ju ◽  
Di Wu
Keyword(s):  
Agricultural Soil ◽  
Ammonia Oxidation ◽  
Oxygen Depletion ◽  
Kinetics Of

Inhibition of Nitrification of Ammonia-Rich Wastewater in Immobilized Nitrifiers System

2011 ◽  
Vol 183-185 ◽  
pp. 197-200 ◽  
Author(s):  
Zhi Rong Li ◽  
Zhi Zhang ◽  
Zhen Jia Zhang
Keyword(s):  
Ammonia Oxidation ◽  
High Strength ◽  
Ammonia Solution ◽  
Ammonia Oxidizing Bacteria ◽  
Inhibition Kinetics ◽  
Nitrite Oxidation ◽  
Haldane Model ◽  
Nitrite Oxidizing Bacteria ◽  
Inhibition Of Nitrification ◽  
Kinetics Of

Inhibition of ammonia oxidation and nitrite oxidation was studied in an immobilized biomass system. Ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) suffered different inhibition in ammonia-rich wastewater. NOB started to be inhibited when FA (free ammonia) was 2mg/L, and was totally inhibited when FA was 8mg/L. AOB started to be inhibited when FA was 22mg/L, and tended to lose activity when FA was higher than 170mg/L. Inhibition kinetics of ammonia oxidation and nitrite oxidation could be described by Haldane model. Immobilization alleviated inhibition of FA to nitrifiers, maintaining high activity even at high strength ammonia solution. Partial nitrification could be achieved by varying degrees of inhibition of FA to AOB and NOB.

scholarly journals Cold Plasma Treatment for Efficient Control over Algal Bloom Products in Surface Water

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1513 ◽  
Author(s):  
Hee-Jun Kim ◽  
Gui-Sook Nam ◽  
Jung-Seok Jang ◽  
Chan-Hee Won ◽  
Hyun-Woo Kim
Keyword(s):  
Surface Water ◽  
Cold Plasma ◽  
Algal Bloom ◽  
Removal Rate ◽  
Oxygen Depletion ◽  
Plasma Process ◽  
Ph Change ◽  
Chl A ◽  
Efficient Control ◽  
Kinetics Of

Algal bloom significantly alters the physicochemical properties of water due to drastic pH change, dissolved oxygen depletion/super-saturation, and toxicity, which lead to ecosystem destruction. To prevent this, this study evaluated the reduction performance of algal biomass by applying a non-thermal or cold plasma process. We used chlorophyll-a (chl-a), suspended solids (SS), and turbidity as indicators of the biomass. Results demonstrated that their removal efficiencies were in the ranges 88–98%, 70%–90%, and 53%–91%, respectively. Field emission scanning electron microscopy indicated how the cell wall of microalgae was destroyed by cold plasma. Also, the removal kinetics of cold plasma confirmed the enhanced removal rate constants. The estimated required times for 99% removal were 0.4–1.2 d (chl-a), 1.3–3.4 d (SS), and 1.6–6.2 d (turbidity), respectively. Overall, cold plasma could be a useful option to effectively treat pollution associated with algal bloom in surface water.

scholarly journals A STUDY ON THE KINETICS OF OXYGEN REDUCTION FOCOAR

2018 ◽  
Vol 55 (5B) ◽  
pp. 111
Author(s):  
Le Quoc Khanh
Keyword(s):  
Oxygen Reduction ◽  
Oxygen Concentration ◽  
Reduction Rate ◽  
Reduction Process ◽  
Oxygen Depletion ◽  
Reducing Agent ◽  
Time Interval ◽  
Low Oxygen ◽  
Living Organisms ◽  
Kinetics Of

          In poor oxygenated environments the oxidation and growth of the living organisms are slowed or stopped, so that food is better preserved. The most appropriate method for oxygen depletion in the air-tight minienvironment is oxygen reduction with iron-based reducing agent, which can reduce the air oxygen concentration to about 0 %, and maintain this low oxygen concentration long during storage. This paper studies the kinetics of oxygen reduction by reducing agent FOCOAR in an airtight minienvironment under isobaric conditions. The kinetics of the reduction process calculated according to the relation vav = [21 % - (end) ] / tend, in which vav is average reduction rate, (end) is oxygen concentration at the end of the experiment, tend is total time needed for the oxygen reduction experiment. Instantaneous reduction rate vred was calculated according to equation vred = ∆/△t, in which ∆is oxygen concentration reduced in time △t, and △t = ti+1 - ti is time interval for oxygen reduction. It is found that vav depends on the quantity of reducing agent FOCOAR, and in certain time interval varies as linear function of reduction time, corresponding to constant vred.  The kinetic result allows an estimating the amount of the reducing agent FOCOAR needed for a preserve minienvironment.

scholarly journals Mobility and Fate of Cerium Dioxide, Zinc Oxide, and Copper Nanoparticles in Agricultural Soil at Sequential Wetting-Drying Cycles

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1270 ◽  
Author(s):  
Mikhail Ermolin ◽  
Natalia Fedyunina ◽  
Olesya Katasonova
Keyword(s):  
Zinc Oxide ◽  
Soil Solution ◽  
Copper Nanoparticles ◽  
Cerium Dioxide ◽  
Agricultural Soil ◽  
Soil Aggregates ◽  
Relative Content ◽  
Zno Nps ◽  
Kinetics Of ◽  
Ionic Forms

Study on the behavior and fate of nanofertilizers in soil plays a key role in the assessment of the efficiency of their use for intended purposes. The behavior of nanoparticles (NPs) in soil depends on environmental scenarios, such as Wetting-Drying cycles (WDCs). In the present work, the mobility and fate of CeO2, ZnO, and Cu NPs in agricultural soil at sequential WDCs have been studied. It has been shown that the mobility of CeO2 and ZnO NPs decreases after each WDC. After four WDCs the relative amount of CeO2 and ZnO NPs leached from soil decreases from 0.11 to 0.07% and from 0.21 to 0.07%, correspondingly. The decrease in the mobility of NPs is caused by their immobilization by water-stable soil aggregates, which are formed at sequential WDCs. Cu NPs are dissolved by soil solution, so their mobility (in ionic forms) increases after each subsequent WDCs. The relative content of Cu2+ sourced from Cu NPs increases up to 0.88% after four WDCs. It has been found that mineral NPs of soil can play an important role in the transport of insoluble engineered NPs. As for soluble NPs, the kinetics of their dissolution governs their mobility in ionic forms.

Kinetics of ammonia oxidation in shock waves

1981 ◽  
Vol 18 (1) ◽  
pp. 873-883 ◽  
Author(s):  
N. Fujii ◽  
H. Miyama ◽  
M. Koshi ◽  
T. Asaba
Keyword(s):  
Shock Waves ◽  
Ammonia Oxidation ◽  
Kinetics Of
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