Mar 26, Abstract Voltametric degradation of phenol was carried out at microbial electrode. This electrode is based on graphite carbon and natural phosphate modified by bacteria inserted in the phosphate matrix, the whole is covered by a polymer developed in situ on the surface. This electrode, designated subsequently by bacteria-NP-CPE, Showed stable response and was characterized with voltametric methods, as cyclic voltammetry CV and electrochemical impedance spectroscopy EIS.
Jump to navigation Jump to search Bacteria biooxidation is an oxidation process caused by microbes where the valuable metal remains but becomes enriched in the solid phase.
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In this process, the metal remains in the solid phase and the liquid can be discarded. The bacterial culture is a mixed culture of Acidithiobacillus ferrooxidansAcidithiobacillus thiooxidans and Leptospirillum ferrooxidans.
The bacterial oxidation process comprises contacting refractory sulfide ROM ore or concentrate with a strain of the bacterial culture for a suitable treatment period under an optimum operating environment. The bacteria oxidise the sulfide minerals, thus liberating the occluded gold for subsequent recovery via cyanidation.
Under controlled continuous plant conditions, the number of bacterial cells and their activity is optimised to attain the highest rate of sulfide oxidation. The bacteria require a very acidic environment pH 1.
The unusual operating conditions for the bacteria are not favourable for the growth of most other microbesthus eliminating the need for sterility during the bacterial oxidation process. Because organic substances are toxic to the bacteria, they are non-pathogenic and incapable of causing disease.
The bacteria employed in the process do not, therefore, pose a health risk to humans or any animals.
The bacterial oxidation of iron sulfide minerals produces iron III sulfate and sulfuric acidand in the case of arsenopyritearsenic acid is also produced. The arsenic is removed from the liquor by coprecipitation with the iron and sulfate in a two-stage neutralisation process. This produces a solid neutralisation precipitate containing largely calcium sulfatebasic iron III arsenate and iron III hydroxide.
The iron III arsenate is sufficiently insoluble and stable to allow the neutralisation product to be safely disposed of on a slimes dam. The neutralisation liquor, purified to contain an acceptable level of arsenic, can be re-used in the milling, flotation or bacterial oxidation circuits.The anammox bacteria carried out propionate oxidation simultaneously with anaerobic ammonium oxidation.
( ± ) agreed well with partial (±50%) oxidation of propionate. The highest rate of propionate oxidation measured in the The present study describes the effects of organic compounds on anaerobic ammonium-oxidizing bacteria.
The. Ursodeoxycholic acid is a bile acid that is produced by bacterial oxidation of chenodeoxycholic acid, and is the only effective treatment.
It retards progression of the disease possibly by reducing apoptosis of hepatocytes and suppression of the cytotoxic effects of other bile acids. This study aims at investigating the effect of ammonia oxidation rate on NO production and assesses its relationship with N 2 O.
Also, the effect of pH and DO on the production of NO and N 2 O was explored in an enriched AOB culture. There are other microaerophilic bacteria with a high affinity for O 2 (e.g., Fe(II)-oxidizing bacteria, Section ) that compete with methanotrophs for O 2 2 S.
The continued development of simulation models, such as the one offered by, will help integrate the effects of the multiple factors affecting rhizosphere CH 4.
Methane isotopic fractionation is defined as a function of temperature and rate during microbial oxidation; the technique is widely used to evaluate landfill cover efficiency. Effect of Temperature and Oxidation Rate on Carbon-isotope Fractionation during Methane Oxidation by Landfill Cover Materials - Environmental Science & Technology .
Nitrogenous fertilizers are generally thought to have an important role in regulating methane oxidation.
In this study, the effect of ammonium on methane oxidation activity was investigated in a paddy soil using urea at concentrations of 0, 50, , and μg N per gram dry weight soil (N/g.d.w.s) and ammonium sulfate at concentrations of 0, 50 and μg N/g.d.w.s.