| The Shanxi Yuncheng saline lake bittern includes the massive natural organic matters whose principal constituent is the humus. The Nanfeng company produces inorganic salts out of the saline lake bittern. The existence of the highly concentrated organic matters has affected the product purity. The paper is for the purpose of searching efficient methods to remove the organic matters.The experiment has evaluated the feasibility of organic matters coagulation. Because of its high density and the high viscosity, the bittern has to overcome a bigger shearing force in the organic matter flocculation process, leading to a quantity of sulfate aluminum several dozens times compared with traditional ones.The study shows that the activated carbon removal efficiency is at a relatively low level and the economic metallic ion lose rate is high.The paper discusses the effect of coagulation, ozone oxidation, catalyzed ozone oxidation to activated carbon adsorption. The experiments show that the flocculation is much easier to remove than the dissolved organic matters through activated carbon filtration and adsorption. Ozone oxidation reduces the molecular weight of the organic matters and increases the number of binding sites which enhance the polarity of the organic matters. As the binding sites increase, the metal and organic complexation is enhanced and much more metal ions are lost with the removal of the organic matters. After the pH value of the bittern is reduced to less than 1, the organic removal efficiency rises and the metallic ion loss reduces.The XDA-1 resin is finally selected to replace activated carbon. After the bittern transfers to pH<=l, the XDA-1 adsorption resin achieves the organic matter direct removal rate over 50%, and the ion loses below 10%. With a combination of middlecatalyzed oxidation and two stages XDA-1 adsorption, the ultimate results satisfy our technical goal with 70% organic matters removed and less than 10% metallic ions lost. |
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