β-Cyclodextrin Polymers on Microcrystalline Cellulose as a Granular Media for Organic Micropollutant Removal from Water

2018 ◽  
Author(s):  
Diego Alzate-Sanchez ◽  
Yuhan Ling ◽  
Chenjun Li ◽  
Benjamin Frank ◽  
Reiner Bleher ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Continuous Flow ◽  
Granular Media ◽  
Anaerobic Biodegradation ◽  
Thin Coating ◽  
Micropollutant Removal ◽  
Cyclodextrin Polymers ◽  
Flow Experiments ◽  
Aerobic And Anaerobic ◽  
Cellulose Composite

This manuscript describes cyclodextrin polymers formed as a thin coating on microcrystalline cellulose. The resulting polymer/cellulose composite shows promising performance for removing organic pollutants from water and can be packed into columns for continuous-flow experiments. The polymer/cellulose composite also shows excellent resistance to aerobic and anaerobic biodegradation.

β-Cyclodextrin Polymers on Microcrystalline Cellulose as a Granular Media for Organic Micropollutant Removal from Water

2018 ◽  
Author(s):  
Diego Alzate-Sanchez ◽  
Yuhan Ling ◽  
Chenjun Li ◽  
Benjamin Frank ◽  
Reiner Bleher ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Continuous Flow ◽  
Granular Media ◽  
Anaerobic Biodegradation ◽  
Thin Coating ◽  
Micropollutant Removal ◽  
Cyclodextrin Polymers ◽  
Flow Experiments ◽  
Aerobic And Anaerobic ◽  
Cellulose Composite

This manuscript describes cyclodextrin polymers formed as a thin coating on microcrystalline cellulose. The resulting polymer/cellulose composite shows promising performance for removing organic pollutants from water and can be packed into columns for continuous-flow experiments. The polymer/cellulose composite also shows excellent resistance to aerobic and anaerobic biodegradation.

β-Cyclodextrin Polymers on Microcrystalline Cellulose as a Granular Media for Organic Micropollutant Removal from Water

2019 ◽  
Vol 11 (8) ◽  
pp. 8089-8096 ◽  
Author(s):  
Diego M. Alzate-Sánchez ◽  
Yuhan Ling ◽  
Chenjun Li ◽  
Benjamin P. Frank ◽  
Reiner Bleher ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Granular Media ◽  
Micropollutant Removal ◽  
Cyclodextrin Polymers

Avalanche Stratification - Experimental Tests of the “Metastable Wedge” and “Continuous Flow” Models

2000 ◽  
Vol 627 ◽  
Author(s):  
M. E. Swanson ◽  
M. Landreman ◽  
J. Michel ◽  
J. Kakalios
Keyword(s):  
Continuous Flow ◽  
Granular Media ◽  
Experimental Tests ◽  
Coarse Sand ◽  
Angle Of Repose ◽  
Flow Models ◽  
Maximum Angle ◽  
Stratification Effect ◽  
Upward Moving ◽  
Moving Layer

ABSTRACTWhen an initially homogeneous binary mixture of granular media such as fine and coarse sand is poured near the closed edge of a “quasi-two-dimensional” Hele-Shaw cell consisting of two vertical transparent plates held a narrow distance apart, the mixture spontaneously forms alternating segregated layers. Experimental measurements of this stratification effect are reported in order to determine which model, one which suggests that segregation only occurs when the granular material contained within a metastable heap between the critical and maximum angle of repose avalanches down the free surface, or one for which the segregation results from smaller particles becoming trapped in the top surface and being removed from the moving layer during continuous flow. The result reported here indicate that the Metastable Wedge model provides a natural explanation for the initial mixed zone which precedes the formation of the layers, while the Continuous Flow model explains the observed upward moving kink of segregated material for higher granular flux rates, and that both mechansims are necessary in order to understand the observed pairing of segregated layersfor intermediate flow rates and cell separations.

Biotransformation of nitrocellulose under methanogenic conditions

1996 ◽  
Vol 34 (5-6) ◽  
pp. 327-334 ◽  
Author(s):  
David L. Freedman ◽  
Bryan M. Caenepeel ◽  
Byung J. Kim
Keyword(s):  
Biological Treatment ◽  
Enrichment Culture ◽  
Basal Medium ◽  
Anaerobic Biodegradation ◽  
Anaerobic Treatment ◽  
Acid Digestion ◽  
Energetic Compounds ◽  
Nitrate Ester ◽  
Digestion Technique ◽  
Aerobic And Anaerobic

Treatment of wastewater containing nitrocellulose (NC) fines is a significant hazardous waste problem currently facing manufacturers of energetic compounds. Previous studies have ruled out the use of biological treatment, since NC has appeared to be resistant to aerobic and anaerobic biodegradation. The objective of this study was to examine NC biotransformation in a mixed methanogenic enrichment culture. A modified cold-acid digestion technique was used to measure the percentage of oxidized nitrogen (N) remaining on the NC. After 11 days of incubation in cultures amended with NC (10 g/L) and methanol (9.9 mM), the % N (w/w) on the NC decreased from 13.3% to 10.1%. The presence of NC also caused a 16% reduction in methane output. Assuming the nitrate ester on NC was reduced to N2, the decrease in CH4 represented almost exactly the amount of reducing equivalents needed for the observed decrease in oxidized N. An increase in the heat of combustion of the transformed NC correlated with the decrease in % N. There was no statistically significant decrease in % N when only NC was added to the culture, or in controls that contained only the sulfide-reduced basal medium. The biotransformed NC has a % N comparable to nonexplosive nitrated celluloses, suggesting that anaerobic treatment may be a technically feasible process for rendering NC nonhazardous.

Automated generation of photochemical reaction data by transient flow experiments coupled with online HPLC analysis

2020 ◽  
Vol 5 (5) ◽  
pp. 912-920
Author(s):  
Christian P. Haas ◽  
Simon Biesenroth ◽  
Stephan Buckenmaier ◽  
Tom van de Goor ◽  
Ulrich Tallarek
Keyword(s):  
Continuous Flow ◽  
Photochemical Reaction ◽  
Hplc Analysis ◽  
Transient Flow ◽  
Data Sets ◽  
Automated Generation ◽  
Reaction Data ◽  
Flow Experiments

Competing homo- and crossdimerization reactions between coumarin and 1-methyl-2-quinolinone are investigated by transient continuous-flow experiments combined with online HPLC, enabling the generation and acquisition of large reaction data sets.

Morphological Characterization of Wax and Surfactant–Encapsulated Microcrystalline Cellulose for Better Dispersion

2020 ◽  
Vol 70 (2) ◽  
pp. 226-231
Author(s):  
Qingzheng Cheng ◽  
Chengfeng Zhou ◽  
Yuanfeng Pan ◽  
Brian Via
Keyword(s):  
Microcrystalline Cellulose ◽  
Morphological Characterization ◽  
Fiber Bundles ◽  
Wood Composite ◽  
Differential Interference Contrast ◽  
Expensive Equipment ◽  
Fine Tune ◽  
Cellulose Composite ◽  
Dic Microscopy

Abstract Encapsulation of cellulose with wax and surfactant is a physical way to restrict cellulose-to-cellulose attraction. Because wax is often used in the wood composite process, industrial manufacturers would not have to upgrade or add expensive equipment to handle cellulose addition. The encapsulated cellulose particles could easily be transported to composite and polymer facilities and blended in a homogeneous fashion for a multitude of products and composites. It was the objective of this study to utilize differential interference contrast (DIC) microscopy to characterize the wax and surfactant coverage and encapsulation morphology of the wax–surfactant–cellulose composite. The lengths and widths of the cellulose particles were significantly changed after encapsulation. DIC microscopy found that we could fine-tune wax coverage to control homogeneity and reduce fiber bundling during dispersion. It was found that surfactants were not necessary to enhance coverage if a 1:4 ratio of wax to microcrystalline cellulose was used. However, if more wax is desired, then surfactants may be necessary to suppress fiber bundles during dispersion.

Evaluation of physicochemical pretreatment of tomato plant for aerobic and anaerobic biodegradation

2019 ◽  
Vol 9 (3) ◽  
pp. 489-497 ◽  
Author(s):  
Aida Gil ◽  
Jose A. Siles ◽  
M. Carmen Gutiérrez ◽  
M. Ángeles Martín
Keyword(s):  
Tomato Plant ◽  
Anaerobic Biodegradation ◽  
Aerobic And Anaerobic
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