电化学处理黄姜生化尾水研究

黄姜提取皂素过程中会产生大量废水,传统的生化方法难以去除这些废水中的难降解有机污染物.因此,本文以黄姜皂素生化尾水为研究对象,分别采用DSA+铁电极组合、不锈钢+铁电极组合、单独钛钌网电极(DSA)对其进行深度处理.结果表明,在原水CODCr为150mg.L-1,色度为200度,Cl-浓度为3338mg.L-1的情况下,不锈钢+铁电极组合、单独DSA电极处理后CODCr去除率分别为35%和43%,色度去除率分别为78.7%和84.6%.相较而言,DSA+铁电极组合在电流密度为95A.m-2、初始pH=7.28时处理30min后,CODCr和色度的去除率分别达到62%和99.5%.采用紫外光谱、三维荧光光谱和凝胶色谱对水质变化进行了详细分析.结果表明,水中难降解有机组分被降解矿化,生成分子量较小的脂肪酸.

Electrochemical treatment of biotreated effluent of turmeric wastewater

Large amounts of wastewater are produced in the extraction process for Diosgen. The refractory organic components in the wastewater cannot be efficiently removed by conventional biological methods. In this study, treatment of turmeric wastewater by electrochemical process with various electrodes were performed and compared. The content of COD_Cr, color degree, and chlorine of the raw wastewater were measured to be 150 mg·L^-1, 200, and 3338 mg·L^-1, respectively. The removal efficiencies of COD_Cr using individual DSA electrode and a combined stainless steel and iron electrode were determined to be 35% and 43%, respectively. Correspondingly, removal efficiencies of color degree measured to 78.7% and 84.6%, respectively. By contrast, the removal efficiencies of the COD_Cr and color degree increased to 62% and 99.5% with a combined DSA and iron electrode under the current density of 95 A·cm^-2 and pH of 7.28 within 30 min. Based on the analysis of the UV wavelength scanning, 3D fluorescence spectral and GPC data, it was concluded that the refractory components were transformed into the organic acids with small molecular weight.