Ozonation by-Products of Humic Acid in the Presence of Hydrogen Peroxide

2014 ◽  
Vol 1030-1032 ◽  
pp. 134-137
Author(s):  
Hyun Sang Shin ◽  
Dong Seok Rhee
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Sample Solution ◽  
Injection Time ◽  
Total Organic Carbon Removal ◽  
Initial Ph ◽  
Decreasing Ph ◽  
By Products

Ozonation of humic acid has been conducted in the presence of hydrogen peroxide as catalyst. Besides the study of total organic carbon removal in the ozonation, ozonation by-products were investigated through the change of injected concentration of H2O2, initial pH of aqueous humic acid and injection time of H2O2. The variation of hydrogen peroxide and formaldehyde contents in the processes are mainly evaluated. The formaldehyde was formed less in ozonation with hydrogen peroxide system than without it. When initial pH in solution was changed from 3.5 to 10.5, the formaldehyde was formed with the highest concentration at pH 5. In addition, the concentration of H2O2 produced by ozonation was found to be increased with decreasing pH of the sample solution in this process.

Ozon/Hydrogen Peroxide System for Degradation of Humic Acid in Water

2014 ◽  
Vol 937 ◽  
pp. 620-623 ◽  
Author(s):  
Kei Woul Kim ◽  
Dong Seok Rhee
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Acid Solution ◽  
Experimental Results ◽  
Treatment System ◽  
Injection Time ◽  
Reaction Parameter ◽  
Removal Ratio ◽  
Initial Ph

The ozone/hydrogen peroxide system has been introduced for the study of degradation of humic acid in water. The removal ratio of TOC in aquatic humic acid solution has been investigated with some reaction parameter like the change of injected concentration of H2O2, initial pH of aqueous humic acid and injection time of H2O2. And the formation of formaldehyde concentrations in the treatment system processes has been also evaluated with the variation of its concentration. From the experimental results, it has been concluded that the concentrations of H2O2 and the initial pH’s in solution in the ozone/hydrogen peroxide system were very important for enhancing the efficiency of degradation of humic acid in water. The formaldehyde was formed less in ozone/hydrogen peroxide system than in ozone alone system.

scholarly journals Degradation and mineralization of 4-tert-butylphenol in water using Fe-doped TiO2 catalysts

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ardak Makhatova ◽  
Gaukhar Ulykbanova ◽  
Shynggys Sadyk ◽  
Kali Sarsenbay ◽  
Timur Sh. Atabaev ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Photocatalytic Degradation ◽  
Total Organic Carbon ◽  
Uv Light ◽  
Electric Energy ◽  
Carbon Removal ◽  
Wet Impregnation ◽  
Total Organic Carbon Removal ◽  
Butyl Phenol ◽  
Pseudo Second Order

AbstractIn the present work, the photocatalytic degradation and mineralization of 4-tert-butylphenol in water was studied using Fe-doped TiO2 nanoparticles under UV light irradiation. Fe-doped TiO2 catalysts (0.5, 1, 2 and 4 wt.%) were prepared using wet impregnation and characterized via SEM/EDS, XRD, XRF and TEM, while their photocatalytic activity and stability was attended via total organic carbon, 4-tert-butyl phenol, acetic acid, formic acid and leached iron concentrations measurements. The effect of H2O2 addition was also examined. The 4% Fe/TiO2 demonstrated the highest photocatalytic efficiency in terms of total organic carbon removal (86%). The application of UV/H2O2 resulted in 31% total organic carbon removal and 100% 4-t-butylphenol conversion, however combining Fe/TiO2 catalysts with H2O2 under UV irradiation did not improve the photocatalytic performance. Increasing the content of iron on the catalyst from 0.5 to 4% considerably decreased the intermediates formed and increased the production of carbon dioxide. The photocatalytic degradation of 4-tert-butylphenol followed pseudo-second order kinetics. Leaching of iron was observed mainly in the case of 4% Fe/TiO2, but it was considered negligible taking into account the iron load on catalysts. The electric energy per order was found in the range of 28–147 kWh/m3/order and increased with increasing the iron content of the catalyst.

scholarly journals Tubular nanofiltration of highly concentrated C.I. Acid Black 210 dye

2013 ◽  
Vol 67 (4) ◽  
pp. 901-906 ◽  
Author(s):  
A. Y. Zahrim ◽  
N. Hilal ◽  
C. Tizaoui
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Dye Removal ◽  
Nanofiltration Membrane ◽  
Solution Ph ◽  
Carbon Removal ◽  
Initial Concentration ◽  
Membrane Performance ◽  
Total Organic Carbon Removal ◽  
Fouling Factor

Tubular nanofiltration membrane performance to treat water for reuse was carried out by choosing C.I. Acid Black 210 dye as a model dye. It has been shown that increasing pH causes reduction in irreversible fouling factor (IFF) and the dye removal is also affected by solution pH. The total organic carbon removal for pH 4, pH 7, pH 8 and pH 10 is 97.9, 92.3, 94.5 and 94.6%, respectively. The conductivity removal for pH 4, pH 7, pH 8 and pH 10 is 85.1, 88.3, 87.8 and 90.7% respectively. The increase in the initial dye concentration causes rapid increase in fouling until 100 mg/l. Then the fouling increases gradually as it reaches a maximum IFF around 13%. This study also shows that the colour of permeate changes from colourless to light greenish/yellowish (initial concentration of 2,000 and 4,000 mg/l) as the initial dye concentration increases. The conductivity removal was also reduced as the initial dye concentration increased due to screening of the Donnan effect with the presence of salt.

Comparative study on electrochemical 4-chlorophenol degradation in different diaphragm systems with combined reduction and oxidation properties

2014 ◽  
Vol 71 (1) ◽  
pp. 126-130 ◽  
Author(s):  
S. L. Liu ◽  
H. Wang ◽  
Z. Y. Bian
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Electrode System ◽  
Hydrogen Gas ◽  
Combined Processes ◽  
Carbon Removal ◽  
Total Organic Carbon Removal ◽  
Oxidation Properties ◽  
Reduction And Oxidation ◽  
The Difference

Two diaphragm electrolysis systems, two-electrode (anode–cathode) and three-electrode (cathode–anode–cathode), were compared for the electrochemical degradation of 4-chlorophenol. The performance of these systems was improved by feeding with hydrogen gas and then with air, in aid of the combined processes of reduction and oxidation. The 4-chlorophenol degradation, dechlorination, and total organic carbon removal were monitored to characterize the difference between the two systems. The results indicated that the three-electrode system exhibited higher degradation percentages for 4-chlorophenol compared with that of the two-electrode system. The dechlorination property of the three-electrode system was stronger than that of the two-electrode system. In addition, the total organic carbon removal percentage of the anodic compartment in the three-electrode system was higher than that of the two-electrode system. The three-electrode system showed excellent treatment properties for 4-chlorophenol.

scholarly journals Effect of Microbial Inoculation on Carbon Preservation during Goat Manure Aerobic Composting

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4441
Author(s):  
Jiawei Lu ◽  
Jingang Wang ◽  
Qin Gao ◽  
Dongxu Li ◽  
Zili Chen ◽  
...  
Keyword(s):  
Humic Acid ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Ph Value ◽  
Trichoderma Viride ◽  
Aerobic Composting ◽  
Microbial Inoculation ◽  
Goat Manure ◽  
Microbial Agents ◽  
Humic Acid Carbon

Carbon is the crucial source of energy during aerobic composting. There are few studies that explore carbon preservation by inoculation with microbial agents during goat manure composting. Hence, this study inoculated three proportions of microbial agents to investigate the preservation of carbon during goat manure composting. The microbial inoculums were composed of Bacillus subtilis, Bacillus licheniformis, Trichoderma viride, Aspergillus niger, and yeast, and the proportions were B1 treatment (1:1:1:1:2), B2 treatment (2:2:1:1:2), and B3 treatment (3:3:1:1:2). The results showed that the contents of total organic carbon were enriched by 12.21%, 4.87%, and 1.90% in B1 treatment, B2 treatment, and B3 treatment, respectively. The total organic carbon contents of B1 treatment, B2 treatment, and B3 treatment were 402.00 ± 2.65, 366.33 ± 1.53, and 378.33 ± 2.08 g/kg, respectively. B1 treatment significantly increased the content of total organic carbon compared with the other two treatments (p < 0.05). Moreover, the ratio of 1:1:1:1:2 significantly reduced the moisture content, pH value, EC value, hemicellulose, and lignin contents (p < 0.05), and significantly increased the GI value and the content of humic acid carbon (p < 0.05). Consequently, the preservation of carbon might be a result not only of the enrichment of the humic acid carbon and the decomposition of hemicellulose and lignin, but also the increased OTU amount and Lactobacillus abundance. This result provided a ratio of microbial agents to preserve the carbon during goat manure aerobic composting.

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