H.S. Yoon, I-J Kang
Keywords: organic impurity, chitosan nanoparticles, lactobacillus sp
Summary:Organic impurities from domestic and industrial wastewater cause soil and water pollution and removal of these pollutants has been becoming important from an environmental and aesthetic point of view. The removal methods of organic pigments are largely divided into physical, chemical or biological methods. Physical methods based on solidification-aggregation of pigments are mainly effective in the removal of sulfur and disperse pigments but have very low coagulation-flocculating abilities for acidic, reactive and evaporative pigments. In addition, there is a disadvantage that the pigment removal efficiency is low and a lot of sludge is generated. Chemical methods of removing pigments through destruction or decomposition of pigment molecules use various oxidizing agents such as ozone, hydrogen peroxide and permanganate. For example, treatment with ozone has high reactivity with a pigments, and is effective because of high pigment removal efficiency. However, it has a short life time and has disadvantages such as difficulty of pigment removal which is not soluble in water, low COD removal efficiency, and expensive ozone’s price. Biological methods, using microorganisms, microorganisms transform toxic substances into less harmful forms. Biological methods are environmentally friendly, low cost, produce less sludge, remove almost all toxicity and have a less water consumption than physicochemical methods. Currently, research on the removal of biological organic pigments using various kinds of substances is underway, such as bacteria, fungi and yeast are representative. Lactic acid bacteria are gram-positive bacteria, which are classified as bacillus and coccus in morphology, and it decompose organic components to produce lactic acid. Certain strains of lactic acid bacteria have useful technical properties and beneficial health effects and are used for fermentation of various foods and beverages. In this study, by using chitosan nanoparticles and Lactobacillus sp., one of the lactic acid bacteria, were reacted with various organic pigments. And then the change of absorbance were measured to examine the organic pigment removal efficiency of chitosan nanoparticles Lactobacillus sp.