scholarly journals Promoted ozonation for the decomposition of 1,4-dioxane by activated carbon

2016 ◽  
Vol 17 (2) ◽  
pp. 613-620 ◽  
Author(s):  
Gui-Peng Tian ◽  
Qian-Yuan Wu ◽  
Ang Li ◽  
Wen-Long Wang ◽  
Hong-Ying Hu
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Butyl Alcohol ◽  
Catalytic Ozonation ◽  
Traditional Treatment ◽  
Treatment Processes ◽  
Tert Butyl Alcohol ◽  
Water And Wastewater ◽  
The Stability ◽  
The Ideal

Worldwide attention has been attracted to 1,4-dioxane because of its probable human carcinogenicity and frequent occurrence in surface waters and wastewaters. Thus, many countries and organizations have set limits for the amount of this material in drinking water and wastewater effluent. However, the removal of 1,4-dioxane during traditional treatment processes, even ozonation (pH < 7), has been limited. Therefore, 1,4-dioxane removal during catalytic ozonation was investigated in this study, and activated carbon was selected as the ideal catalyst. The removal efficiency of 1,4-dioxane by ozonation was promoted significantly using activated carbon compared with that of ozonation only. Tert-butyl alcohol significantly reduced the removal efficiency of 1,4-dioxane during catalytic ozonation, which suggested that hydroxyl radicals (·OH) were formed during catalytic ozonation and played an important role in decomposing 1,4-dioxane. Additionally, results concerning the stability of activated carbon indicated that the catalytic activity of this catalyst remained steady during ozonation.

Graphene, electrospun membranes and granular activated carbon for eliminating heavy metals, pesticides and bacteria in water and wastewater treatment processes

The Analyst ◽  
2018 ◽  
Vol 143 (23) ◽  
pp. 5629-5645 ◽  
Author(s):  
Piumie Rajapaksha P. ◽  
Aoife Power ◽  
Shaneel Chandra ◽  
James Chapman
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Water And Wastewater Treatment ◽  
Safe Water ◽  
Treatment Processes ◽  
Electrospun Membranes ◽  
Water And Wastewater

The availability of safe water has a significant impact on all parts of society, its growth and sustainability, both politically and socioeconomically.

Catalytic ozonation of bisphenol A in aqueous solution using Mn-Ce/HZSM-5 as catalyst

2015 ◽  
Vol 72 (5) ◽  
pp. 696-703 ◽  
Author(s):  
Yanfang Liu ◽  
Junna Zhao ◽  
Zaixing Li ◽  
Guixia Li ◽  
Wei Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Bisphenol A ◽  
Heterogeneous Catalysts ◽  
Butyl Alcohol ◽  
Catalytic Ozonation ◽  
Point Of Zero Charge ◽  
Toc Removal ◽  
Tert Butyl Alcohol ◽  
Bpa Removal

Mixed manganese and cerium oxide supported on HZSM-5 were synthesized and used as heterogeneous catalysts for ozonation of bisphenol A (BPA) in aqueous solution. The prepared catalysts of Mn-Ce/HZSM-5 were characterized by X-ray diffraction, scanning electron microscopy and Fourier transform-infrared spectroscopy. The results indicated that Mn-Ce/HZSM-5 exhibits extraordinary catalytic activity for the degradation of BPA. Removal of 89.3% of BPA and 90.4% of total organic carbon (TOC) was achieved in 30 min, compared to non-catalytic ozonation, where only 50.5% BPA and 28.1% TOC removal were reached under the same conditions. Adsorption of BPA on HZSM-5 support and Mn-Ce/HZSM-5 catalysts was negligible. The strong inhibition of BPA removal by tert-butyl alcohol indicated that the attack of hydroxyl radicals was responsible for the improvement of catalytic ozonation. It was observed that at neutral pH, which is near the point of zero charge of the catalyst, the catalytic activity reached its maximum. Increasing the amount of Mn-Ce/HZSM-5 catalyst until it exceeded 3 g/L did not show a strong effect on BPA removal. The catalysts showed high stability and reusability.

Characterisation of dissolved organic matter to optimise powdered activated carbon and clarification removal efficiency

2020 ◽  
Vol 6 (8) ◽  
pp. 2065-2077
Author(s):  
Y. Shutova ◽  
N. R. H. Rao ◽  
A. Zamyadi ◽  
A. Baker ◽  
J. Bridgeman ◽  
...  
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Dissolved Organic Matter ◽  
Removal Efficiency ◽  
Powdered Activated Carbon ◽  
Treatment Processes ◽  
Organic Matter Fractions ◽  
P Removal

Removal of dissolved organic matter fractions via three different treatment processes.

Dispersion of Si3N4 Powders in Tert-Butyl Alcohol

2012 ◽  
Vol 512-515 ◽  
pp. 837-840
Author(s):  
Sheng Lian Yao ◽  
Xu Ping Lin ◽  
Jing Tao Ma ◽  
Chang An Wang ◽  
Chang Sheng Deng
Keyword(s):  
Molecular Weight ◽  
Thermogravimetric Analysis ◽  
Chemical Properties ◽  
Butyl Alcohol ◽  
Surface Chemical ◽  
Porous Si ◽  
Rheological Measurement ◽  
Tert Butyl ◽  
Tert Butyl Alcohol ◽  
The Stability

A high molecular weight block copolymer dispersant with pigment affinic groups — DISPERBYK163 (BYK163) was chosen to disperse submicron-sized Si3N4 in tert-butyl alcohol (TBA) solvent. The stability of Si3N4 powders in TBA with dispersant BYK163 was studied by sedimentation. To achieve good casting behavior, rheological measurement was employed to find a reasonable dispersant content in the slurry. The adsorption isotherm of BYK163 on Si3N4particles surface was obtained by thermogravimetric analysis (TGA). Based on the surface chemical properties of Si3N4particles, the dispersing phenomena and mechanism of BYK163 in TBA were summarized. BYK163 could form a steric layer on the surface of Si3N4particles, and effectively prevent particles agglomeration. Therefore, porous Si3N4samples with porosity of 40% to 80% could be prepared from Si3N4slurries with low and high solid loadings due to well dispersion with BYK163 addition.

Heterogeneous Catalytic Ozonation of COD and Quinoline from Coal Gasification Wastewater Secondary Effluent with Carbon Supported Copper Oxides as Catalyst

2013 ◽  
Vol 316-317 ◽  
pp. 379-382 ◽  
Author(s):  
Hong Jun Han ◽  
Hai Feng Zhuang
Keyword(s):  
Coal Gasification ◽  
Catalytic Performance ◽  
Catalytic Ozonation ◽  
Radical Scavenger ◽  
Secondary Effluent ◽  
Heterogeneous Catalytic ◽  
Treatment Processes ◽  
Radical Removal ◽  
Coal Gasification Wastewater ◽  
The Stability

Coal gasification wastewater (CGW) is a refractory and toxic wastewater. The secondary effluent quality usually cannot meet the discharge standards after conventional biological treatment processes. Heterogeneous catalytic ozonation is a promising technology for solving this problem. Two carbon materials were investigated as ozonation catalysts for the removal of the quinoline and COD in a real CGW secondary effluent. Results were indicated that CuOx /GAC presented a higher catalytic performance than granular activated carbon and single ozone, efficiency of removal of quinoline and COD were 69%, 92% respectively. Higher pH had positive effect on the degradation of quinoline due to the formation of hydroxyl radical (removal of quinoline rapidly reached above 90% in pH=10). The presence of the radical scavenger tert-butanol (TBA) evidenced the participation of hydroxyl radicals (•OH) in the oxidation mechanisms of quinoline. The stability of the catalysts was demonstrated by carrying repetitive experiments reusing catalysts sample.

Homogeneous and Heterogeneous Catalytic Ozonation of Pulp Bleaching Effluent

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
Işıl Akmehmet Balcıoğlu ◽  
Çiğdem Kıvılcımdan Moral
Keyword(s):  
Activated Carbon ◽  
Treatment Method ◽  
Catalytic Ozonation ◽  
Pulp And Paper ◽  
Production Plant ◽  
Pulp Bleaching ◽  
Heterogeneous Catalytic ◽  
Promising Treatment ◽  
Water And Wastewater ◽  
Granulated Activated Carbon

AbstractCatalytic ozonation is a promising treatment method for both water and wastewater. In this study, in order to increase the biodegradability of bleaching wastewater from an integrated pulp- and -paper production plant, granulated activated carbon-(GAC), iron-(Fe

Practical Guide to Determine the Impact of Radon and Other Radionuclides on Water Treatment Processes

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1255-1264
Author(s):  
K. L. Martins
Keyword(s):  
Activated Carbon ◽  
Water Treatment ◽  
Environmental Protection Agency ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Packed Tower ◽  
Treatment Processes ◽  
Radioactivity Exposure ◽  
The Impact ◽  
Percent Removal

During treatment of groundwater, radon is often coincidentally removed by processes typically used to remove volatile organic compounds (VOCs)-for example, processes such as liquid-phase granular activated carbon (LGAC) adsorption and air stripping with vapor-phase carbon (VGAC). The removal of radon from drinking water is a positive benefit for the water user; however, the accumulation of radon on activated carbon may cause radiologic hazards for the water treatment plant operators and the spent carbon may be considered a low-level radioactive waste. To date, most literature on radon removal by water treatment processes was based on bench- or residential-scale systems. This paper addresses the impact of radon on municipal and industrial-scale applications. Available data have been used todevelop graphical methods of estimating the radioactivity exposure rates to facility operators and determine the fate of spent carbon. This paper will allow the reader to determine the potential for impact of radon on the system design and operation as follows.Estimate the percent removal of radon from water by LGAC adsorbers and packed tower air strippers. Also, a method to estimate the percent removal of radon by VGAC used for air stripper off-gas will be provided.Estimate if your local radon levels are such that the safety guidelines, suggested by USEPA (United States Environmental Protection Agency), of 25 mR/yr (0.1 mR/day) for radioactivity exposure may or may not be exceeded.Estimate the disposal requirements of the waste carbon for LGAC systems and VGAC for air stripper “Off-Gas” systems. Options for dealing with high radon levels are presented.

Removal of sulphite-reducing clostridia spores by full-scale water treatment processes as a surrogate for protozoan (oo)cysts removal

2000 ◽  
Vol 41 (7) ◽  
pp. 165-171 ◽  
Author(s):  
W. A. Hijnen ◽  
J. Willemsen-Zwaagstra ◽  
P. Hiemstra ◽  
G. J. Medema ◽  
D. van der Kooij
Keyword(s):  
Water Treatment ◽  
Removal Efficiency ◽  
Water Quality Monitoring ◽  
Full Scale ◽  
Process Conditions ◽  
Safe Drinking Water ◽  
Unit Process ◽  
Treatment Processes ◽  
Scale Unit ◽  
Micro Organisms

At eight full-scale water treatment plants in the Netherlands the removal of spores of sulphite-reducing clostridia (SSRC) was determined. By sampling and processing large volumes of water (1 up to 500 litres) SSRC were detected after each stage of the treatment. This enabled the assessment of the removal efficiency of the full-scale unit processes for persistent micro-organisms. A comparison with literature data on the removal of Cryptosporidium and Giardia by the same type of processes revealed that SSRC can be considered as a potential surrogate. The average Decimal Elimination Capacity (DEC) of the overall treatment plants ranged from 1.3–4.3 log. The observed actual log removal of SSRC by the unit processes and the overall treatment at one of the studied locations showed that the level of variation in removal efficiency was approximately 2 log. Moreover, from the actual log removal values it was observed that a low SSRC removal by one unit process is partly compensated by a higher removal by subsequent unit processes at this location. SSRC can be used for identification of the process conditions that cause variation in micro-organism removal which may lead to process optimization. Further research is necessary to determine the optimal use of SSRC in water quality monitoring for the production of microbiologically safe drinking water.

Thermodynamic and Kinetic Investigation of the Solvent Effect on the Oxidation of [Co(en)2SCH2COO]+ with S2O82- In Water-Methanol and Water-tert-Butyl Alcohol Mixtures

1993 ◽  
Vol 58 (5) ◽  
pp. 1001-1006 ◽  
Author(s):  
Oľga Vollárová ◽  
Ján Benko
Keyword(s):  
Transfer Functions ◽  
Activation Parameters ◽  
Butyl Alcohol ◽  
Oxidation Of Co ◽  
Kinetics Of Oxidation ◽  
Tert Butyl ◽  
Tert Butyl Alcohol ◽  
Alcohol Mixtures ◽  
Kinetics Of

The kinetics of oxidation of [Co(en)2SCH2COO]+ with S2O82- was studied in water-methanol and water-tert-butyl alcohol mixtures. Changes in the reaction activation parameters ∆H≠ and ∆S≠ with varying concentration of the co-solvent depend on the kind of the latter, which points to a significant role of salvation effects. The solvation effect on the reaction is discussed based on a comparison of the transfer functions ∆Ht0, ∆St0 and ∆Gt0 for the initial and transition states with the changes in the activation parameters accompanying changes in the CO-solvent concentration. The transfer enthalpies of the reactant were obtained from calorimetric measurements.

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