Papers by Keyword: Decolorization

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Authors: Zheng Hua Xiao, Tao Wang
Abstract: Nanostructured SnO2 was prepared by a parallel flow method under ultrasonic vibration. The photocatalytic performance of SnO2 was investigated by utilizing photocatalytic decolorization of methyl orange used as model organic pollutant. SnO2 prepared was characterized by BET, XRD and SEM. The results show that ultrasonication can influence greatly the specific surface parameters, SEM image and particle size, thus leading to better photocatalytic performance. The photocatalytic performance of SnO2 prepared by ultrasonication is 1.5 times of that of SnO2 prepared without ultrasonication.
Authors: Ning Liu, Tao Liu
Abstract: Eggshell membrane is a natural biomaterial with macropores lattice and high surface area. The bio-sorption and decolorization of organic dye eosin B was investigated based on eggshell membrane. The effect of adsorption time, pH value and temperature of eggshell membrane on the decolorization of eosin B was studied. Time for adsorption to reach equilibrium is 100 min. Optimum pH value is 2.0 for the adsorption. And the amount of dye removed by egg shell membrane was increasing as temperature ascending. At room temperature and optimum conditions, 95% of eosin B could be removed and maximum adsorption of 40.9 mg/g had been achieved. The adsorption behavior of eggshell membrane towards eosin B fit well with Freundlich isotherm.
Authors: Hayo Müller-Simon, Peter Griebenow
Abstract: Zinc selenite, calcium selenite and metallic selenium have been consecutively introduced as decolorizing agents in a flint glass production. The selenium concentration in the glass has been measured by wet-chemical analysis, optically by the evaluation of the cielab a-value and electrochemically by means of a voltammetric sensor. All measuring techniques showed the highest selenium retention for calcium selenite followed by zinc selenite and the least retention using metallic selenium. The best reproducibility is achieved using zinc selenite while both calcium selenite and metallic selenium provide only poor reproducibility.
Authors: Li Fan
Abstract: One effective bromoamine acid (BAA) degrading strain FL was isolated previously with the ability to use BAA as the sole source of carbon and energy. The strain FL was applied in a combined process of microelectrolysis (ME) and biological aerated filter (BAF) to treat the bromoamine acid wastewater, and the treatment efficiency was investigated. It was shown that when the influent CODcr was lower than 1000 mg L-1, and the total hydrolytic retention time (HRT) was 37.7 h, the removal rate of chrominance and CODcr could reach 95.3% and 77.3% respectively. Most of the chrominance was removed by the ME treatment, while the removal of CODcr is mostly owned to the BAF treatment. After long-term contact with the BAA wastewater, the strain FL became one of the predominent species in BAF. When the system was subjected to hydraulic loading shock, the strain FL ensured the efficient removal of chrominance and BAA.
Authors: Ling Yu Zhu, Xue Hui Xie, Na Liu, Hong Jiang, Fang Yang, Thu Hien Nguyen, Jian She Liu
Abstract: Studies were carried out on the decolorization of Direct Red 28 (DR) and Direct Yellow 12 (DY) by developed bacterial consortium. Effects of pH, temperature, and NaCl concentrations on degradation were studied. GC-MS was used to detect the intermediates produced in the effluents of anaerobic step. The optimum pH and temperature for the degradation of DR and DY were pH 7 and 6, and 37°Cand 45°C, respectively. We observed the peak of benzenamine in GC-MS analysis. The products formed during the reduction of DY12 were benzenamine and 2-Amino-1-hydroxybenzene. The results showed a complete degradation of DY12 by the bacterial consortium.
Authors: Kui Zhang, Hong Qiao Xing, Yao Qing Wang
Abstract: The optimal conditions of production of flocculant by the culture of Flavobacterium sp. were examined, using molasses wastewater to replace glucose as carbon source and energy source in the culture medium. Results showed that the COD concentration in molasses wastewater favorable for the growth of the Flavobacterium sp. was 5000 mg•L-1, and inoculum size of 5%(v/v), 30°C, initial pH 7.0 and shaking speed of 150 r•min-1, under the optimal culture conditions, the highest flocculating activity achieved for Kaolin suspension was 95.0% and 4.0 g biomass /L broth was obtained. The Flavobacterium sp. biomass was effective in flocculating some soluble reactive dyes in aqueous solution, reactive Light-Yellow K-4G with a decolorization efficiency of 98.5, using 20 mL of the flocculant in 500 mL of 100 mg•L-1 dye solution.
Authors: Gang Chen, Man Hong Huang, Liang Chen, Dong Hui Chen
Abstract: Modified anaerobic-anoxic-aerobic (A2O) technology for dye wastewater was studied. The effects of Hydraulic retention times (HRT), sludge retention time (SRT) and carbon source on treatment efficiency were discussed. Scanning electron microscopes (SEM) for different sludge and UV-visible spectrum analysis for influent and effluent were investigated respectively. The results showed that when COD of influent was 600~1200 mg/L and the dye concentration was 20~40 mg/L, HRT had the obvious effect on treatment efficiency of modified A2O system. Total treatment efficiency of the improved system was more than 90% at the optimal HRT (29 h). The dye structure was demonstrated to be changed during the process. Finally, the dye and its intermediates were transformed and mineralized respectively.
Authors: Zhong Quan Wang, Yan Mao Wen
Abstract: This article dealt with the synergistic effect of plant and microbe on malachite green decolorization. Plant (Canna generalis) and microbe (Pseudomonas aeruginosa) were adapted to culture in 20 mg.L-1 malachite green solution alone or combined for 7 d or 14 d,after culture the residual concentration of the malachite green solution were determined. The results indicated that P. aeruginosa used alone was useless to malachite green decolorization, while C. generalis used alone removed 42.6%-53.2% of malachite green in 7 d-14 d culture, and the combined use of C.generalis and P.aeruginosa removed 60.4%-75.5% of malachite green. P.aeruginosa and C.generalis had synergistic effects on malachite decolorization. This research was benifited for the actual use of combinational remediation of malachite green by plant and microbe.
Authors: Tao Wang, Xi Yang He, Jian Zhang Li, Jun Bo Zhong, Feng Chun Zeng, Wei Hu
Abstract: This report has shown that the dye of Methyl Orange (MO) in water can be decolorized effectively in the presence of KIO3 under UV irradiation. Decolorisation efficiency of MO increases as the loading of KIO3 increases and has no an optimal amount of KIO3 in this case. The kinetic result shows that the decolorisation reaction is a pseudo first-order reaction when the concentration of MO is below 10 mgL-1. The influences of the pH value and hydroxyl radical scavengers on the decolorisation reaction were investigated in detailed. Several observations indicate that the mechanism is not the attack of hydroxyl radicals in MO decolorisation with KIO3 under UV irradiation. More considerations should be focused on the underlying possible decolorisation mechanism of MO with KIO3 under UV irradiation.
Authors: Wen Tao Yi, Chun Yan Yan, Xiao Xia Wu
Abstract: Salt lakes with large reserves of mineral resources are widely distributed in China. In addition to aboundant inorganic substances, there also exist a mass of organic compounds in the brine. It is realized these organic compounds can produce serious negative effects on the process equipment and products quality. In this work, the decolorization and COD removal of the brine by ozonation were investigated in a bubble column reactor. The effects of contact time, ozone-air flow rate, pH and temperature on the decolorization and COD removal were investigated. It was found that the decolorization and COD removal rates increased with increasing ozone-air flow rate and contact time, while increased first and then decreased with increasing temperature and pH. Under the optimal conditions, color removal reached 47.3% and COD was reduced by 42.2%. Thus, ozonation can be used as the pretreatment method for decolorization and COD removal of the brine.
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