彩色无碳纸脱色回用生产实践

彩色无碳纸脱色回用到文化纸的生产实践表明,当漂液用量为5 kg/吨纸时,脱色效果最好。用彩色无碳纸脱色浆替代5%的漂白麦草浆,成纸的白度、不透明度、裂断长和耐折度等物理指标均有所提高。彩色无碳纸脱色浆配抄文化纸不仅可以提高产品质量,而且可以降低生产成本。     

活性染料废水电凝聚脱色能耗分析

文章在铝阳极和不锈钢阴极的电化学体系中,在恒电流模式下,考察了．活性生红M-3BE模拟废水脱色过程及能耗的影响因素。实验结果表明,电流密度、电解液初始pH值、氯化钠电解质浓度、温度、染料浓度对染料溶液脱色效率影响较大;电流密度、电解液初始pH值、氯化钠与硫酸钠电解质浓度、温度对脱色过程能耗影响显著。在一定实验条件下,染料溶液脱色率可达到98％,能耗117．75kwh／（kg dye）。在不同pH的范围内,活性红M～3BE表现的脱色机理不同,pH4～8为混凝与阴极还原脱色共同作用,pH小于4和大于9则表现为阴极还原脱色为主,且低pH下能耗较低。氯化钠既有助于提高染料废水的脱水效率,又有助于降低脱色过程中的能耗。     

Enzymatic decolorization of bacterial pigments from culturally significant marble

Marble monuments and facades are susceptible to microbial colonization. Microbial growth on a marble surface can develop into unsightly red stains whose removal has proven problematic. The purpose of this study was to determine if the red-brown stains on Isamu Noguchi's marble sculpture Slide Mantra (1991) could be caused by pigment-producing microorganisms and to assess the potential of enzymatic stain remediation. Traditional cell culture methods were used to isolate a pigmented bacterium from a stained area of the sculpture. Sequencing and analysis of the 16S rRNA gene identified the organism as a strain of Serratia marcescens, and FT-IR spectroscopy demonstrated that the pigment produced by the bacteria was most likely a prodigiosin. Decolorization of the pigment in solution demonstrated that the enzyme laccase from the fungus Trametes versicolor has potential as a decolorizing agent. This study suggests that enzymatic decolorization may be applicable to stains on culturally significant marble caused by microbial colonization.