Papers by Keyword: Decoloration

Abstract: The decoloration method for Inulin from Jerusalem artichoke with activated carbon andmacroporous resin was investigated in this manuscript. Six resins (D113, D301, 001×7, 201×7,DA201-C and activated carbon) with same diameter were studied through static experiments.Meanwhile, the decoloration duration and resin dosage were also determined. Macroporous resinadsorption method was better than the traditional activated carbon adsorption method. The resultsalso suggested that the polar and ionogenic properties significantly affected the decoloration rate. The001×7-201×7 type resin which are strongly polar resin offered the better decolorizing effect. Most ofpigment impurities were successfully removed from inulin solutions with 1:10 resin dosage and 40min decoloration process. Moreover, the decoloration rate and inulin loss rate were 82.29% and 12.67%respectively. This study would provide a potential approach for large-scale production of inulin forits wide applications in dietary supplements.

Abstract: Polysilicate aluminum and magnesium (PSAM) was prepared by using aluminum sulfate, magnesium sulfate, sodium silicate, sodium hydroxide as raw materials. Taking domestic sewage from Xingtai Polytechnic College as processing object, the flocculation performance of PSAM and other traditional flocculants was analyzed by coagulation and agitation test. The results show that PSAM has a good flocculation performance and is superior to the conventional flocculants such as polymerization aluminum chloride, aluminum sulfate and magnesium sulfate in treating domestic sewage.

Abstract: Night-soil pollution is a serious environmental and public health problem in highly populated and developing countries. Static and dynamic experiments were carried out to study the chroma and COD removal effect of night-soil sewage by ozone oxidation technique. The results show that, both the chroma and COD of night-soil sewage decrease with the growth of ozone dosage, and the chroma removal rate can be up to 90%, while the COD removal rate is less than 50%. The utilization efficiency of ozone decreases with the chroma reduction or the reactor diameter increasing. The appropriate diameter of ozonization reactor used in eco-friendly toilets is 150mm, and the optimal ozone dosage is 400mg/L.

Abstract: Methylene blue (MB) was examined for oxidation decoloration. Results indicated that the use of ferrate resulted in effectively removal of chroma which has been explained by oxidation and flocculation interactions. Reaction conditions were optimized concerning ferrate addition mass, reaction temperature and dye concentration. The optimization mass of ferrate and the optimization reaction temperature was observed with decoloration of methylene blue wastewater.

Abstract: Two kinds of vitamin B12 waste water from a pharmaceutical factory were treated separately by methods of combining micro-electrolysis with physiochemical and O3 oxidation. Effects of the reaction conditions on the removal rate of color were investigated. Results showed that the color removal rate of vitamin B12 waste water, which was treated by combined micro-electrolysis and physiochemical treatment reached 71.25%, while the color removal rate of the other waste water which treated by O3 oxidation reached 68.80%. The decolorizing treatment of those different natures of vitamin B12 waste water effectively provides a useful reference for this kind of waste water.

Abstract: Three kinds of denims were treated by the use of KMnO4/H3PO4 solutions. The decoloration processes were controlled by processing time, KMnO4 and H3PO4 concentrations. The denim color shades before and after treatment were measured and compared. The results showed that the brightness of denim generally was enhanced by increasing processing time、KMnO4 and H3PO4 concentrations. Color shade changed depending on denim types.

Abstract: Waste water discharged from dye plant contains high sanity ,high chroma and high CODcr (Chemical Oxygen Demand), commonly used biodegradation is often limited in application; As a new efficient advanced oxidation, pulsed corona discharge combining with ozone is attracting more and more attention. A special reactor was designed, in addition, the removal of COD and decoloration of stimulant dye wastewater containing disperse blue 2BLN dye (100mg/L) by pulsed corona discharge combining with ozone were investigated . It showed that in alkaline solution, the maximum COD removal and decoloration rate(58.8% and 99.1%) was observed ,which demonstrated that ozone and pulsed discharge was more efficient on COD removal and decolouration in alkalin than in neutral solution when all the samples were treated for13mins. After being treated, B/C increased from 0.2 to 0.45. Decoloration efficiency and COD removal could be improved obviously when oxygen feed increased from 40 to80L /h，yet further increase in oxygen feed led to a markedly decrease of decolouration efficiency and COD removal.

Abstract: Dodecyltrimethylammonium chloride was used to modify na-bentonite in Sichuan Yanting. It was studied that the optimal modification conditions of bentonite and its optimum decoloration conditions of crystal violet in dyeing wastewater. The optimum preparation conditions were that the concentration of dodecyltrimethylammonium chloride was 1000mg /L, the preparation temperature was 70°C and the mixing time was 20 minutes. The optimum adsorption conditions for crystal violet were that the pH value was 8, the mixing time was 20 minutes and the dosing quantity of modified bentonite was 15 g/L. The decoloration rate was 85.4% under aforesaid conditions.

Abstract: Dyes are usually difficult to be decolorized due to their complex chemical structures. In this work, a bacterium which had the ability of decoloration on synthetic dyes was isolated from Yancheng printworks and was identified as Pseudomonas aeruginosa. The effects of concentration of the dye concentration, cultural time, cultural temperature and initial pH of cultural medium on the efficiency of decoloration were investigated. The result showed that the optimal cultural conditions was: dye concentration was 50mg.L-1, cultural time was 72 h, cultural temperature was 28°C, initial pH of cultural medium was 7.0.

Abstract: The complex decolorizer of active carbon and attapulgite was synthesized for the decoloration of Lentinan extract. The effects of decolorizer dosage, temperature and pH were investigated through single factor experiments. The experimental results show that the decoloration rate with the complex decolorizer was close to that with the active carbon, while the loss rate of polysaccharide was significantly lower than that with the active carbon. The optimum decoloration conditions were decolorizer dosage 2 wt%, temperature 50 oC and pH 6.0. Under these optimum decoloration conditions, the decoloration rate and the polysaccharide loss rate were 87.2% and 12.6%, respectively.