Slurry Bioremediation of Petrochemical Waste Sludges

Slurry bioremediation testing was conducted on waste sludges from petrochemical production. The study concludes that the apparent mechanism for remediation of the waste involves an initial dissolution of the waste constituents into the aqueous phase followed by actual biodegradation. The test reactor most successful in the solubilization and dispersal of waste constituents and possibly most effective in reducing waste sludge mass during treatment is the reactor with the lowest waste sludge-to-microorganism ratio.

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Formation of Gas Hydrate – Oil Associates in the Aqueous Phase During the Grow of Gas Hydrate Crystals in Water – Oil – Methane System

Химия в интересах устойчивого развития ◽

10.15372/khur20180401 ◽

2018 ◽

Keyword(s):

Aqueous Phase ◽

Gas Hydrate

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Aqueous Phase Diffusion in Crystalline Rock

MRS Proceedings ◽

10.1557/proc-11-v569 ◽

1981 ◽

Vol 11 ◽

Cited By ~ 4

Author(s):

M.H. Bradbury ◽

D. Lever ◽

D. Kinsey

Keyword(s):

Radioactive Waste ◽

Aqueous Phase ◽

Water Movement ◽

Degradation Products ◽

Crystalline Rock ◽

Crystalline Rocks ◽

Radionuclide Transport ◽

Fracture Networks ◽

Phase Diffusion ◽

Main Factors

One of the options being considered for the disposal of radioactive waste is deep burial in crystalline rocks such as granite. It is generally recognised that in such rocks groundwater flows mainly through the fracture networks so that these will be the “highways” for the return of radionuclides to the biosphere. The main factors retarding the radionuclide transport have been considered to be the slow water movement in the fissures over the long distances involved together with sorption both in man-made barriers surrounding the waste, and onto rock surfaces and degradation products in the fissures.

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Liquid-liquid extraction of succinate using a dicopper cryptate

10.26434/chemrxiv.11786784 ◽

2020 ◽

Author(s):

Riccardo Mobili ◽

Sonia La Cognata ◽

Francesca Merlo ◽

Andrea Speltini ◽

Massimo Boiocchi ◽

...

Keyword(s):

Aqueous Phase ◽

Visible Spectrum ◽

Tca Cycle ◽

Residual Concentration ◽

Waste Products ◽

Liquid Liquid Extraction ◽

The Tca Cycle ◽

Quantitative Extraction ◽

Uv Visible

<div> <p>The extraction of the succinate dianion from a neutral aqueous solution into dichloromethane is obtained using a lipophilic cage-like dicopper(II) complex as the extractant. The quantitative extraction exploits the high affinity of the succinate anion for the cavity of the azacryptate. The anion is effectively transferred from the aqueous phase, buffered at pH 7 with HEPES, into dichloromethane. A 1:1 extractant:anion adduct is obtained. Extraction can be easily monitored by following changes in the UV-visible spectrum of the dicopper complex in dichloromethane, and by measuring the residual concentration of succinate in the aqueous phase by HPLC−UV. Considering i) the relevance of polycarboxylates in biochemistry, as e.g. normal intermediates of the TCA cycle, ii) the relevance of dicarboxylates in the environmental field, as e.g. waste products of industrial processes, and iii) the recently discovered role of succinate and other dicarboxylates in pathophysiological processes including cancer, our results open new perspectives for research in all contexts where selective recognition, trapping and extraction of polycarboxylates is required. </p> </div>

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THERMAL STUDIES ABOUT THE HIGH TEMPERATURE ENGINEERING TEST REACTOR

10.26678/abcm.encit2016.cit2016-0693 ◽

2016 ◽

Author(s):

Maria Elizabeth Scari ◽

Antonella Lombardi Costa

Keyword(s):

High Temperature ◽

Thermal Studies ◽

Test Reactor

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A method for selective separation of scandium (III) from yttrium and a number of rare-earth elements for its subsequent determination

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2018-84-11-23-27 ◽

2018 ◽

Vol 84 (11) ◽

pp. 23-27

Author(s):

M. I. Degtev ◽

A. A. Yuminova ◽

A. S. Maksimov ◽

A. P. Medvedev

Keyword(s):

Rare Earth ◽

Aqueous Phase ◽

Selective Isolation ◽

Optimum Ratio ◽

Extraction Condition ◽

Sulfosalicylic Acid ◽

Salting Out ◽

Subsequent Determination ◽

Toxic Organic Solvents ◽

Metal Ions Extraction

The possibility of using an aqueous stratified system of antipyrine — sulfosalicylic acid — water for the selective isolation of scandium macro- and microquantities for subsequent determination is studied. The proposed extraction system eliminates the usage of toxic organic solvents. The organic phase with a volume of 1.2 to 2.0 ml, resulting from delamination of the aqueous phase containing antipyrine and sulfosalicylic acid is analysed to assess the possibility of using such systems for metal ions extraction. Condition necessary for the formation of such a phase were specified: the ratio of the initial components, their concentration, presence of inorganic salting out agents. The optimum ratio of antipyrine to sulfosalicylic acid is 2:1 at concentrations of 0.6 and 0.3 mol/liter in a volume of the aqueous phase of 10 ml. The obtained phase which consists of antipyrinium sulfosalicylate, free antipyrine and water, quantitatively extracts macro- and microquantities of scandium at pH = 1.54. Macro- and microquantities of yttrium, terbium, lanthanum, ytterbium and gadolinium are not extracted under the aforementioned conditions thus providing selective isolation of scandium from the bases containing yttrium, ytterbium, terbium, lanthanum, and gadolinium.

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