摘要:
以TOC和UV254为指标,比较了不同条件下腐植酸的臭氧氧化和过氧化氢催化氧化效果,运用HPLC和热裂解-GC-MS分析考察了氧化前后有机物分子量分布和官能团构造的变化情况.研究结果表明过氧化氢和臭氧单独作为氧化剂对水中TOC基本上没有去除作用,但均能导致水中UV254浓度的降低;在几种催化剂的作用下,过氧化氢对TOC和UV254的去除效果明显提高,其中以O3作为催化剂的效果最好Fe2+次之,而Mn2+和Cu2+的催化效果较差;过氧化氢催化氧化和臭氧化均导致有机物分子量分布向小分子的方向转移,氧化后水中以羧酸、醇、胺、酯、醚、烷烃为代表的含氧基团和饱和构造基团明显增多过氧化氢催化氧化和臭氧氧化均有助于改善混凝处理和活性炭吸附处理的效果.
关键词:
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腐植酸
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臭氧
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过氧化氢
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催化氧化
Abstract:
This paper mainly studied the characteristics of ozonation and hydrogen pero xide (H2O2)catalytic oxidation on the treatment of humic acids. The effects of ozonation and hydrogen peroxide catalytic oxidation on the treatment of humic acids were evaluated by TOC and UV254, and the structure and mole cular weight before and after oxidation were analyzed by Pyrolysis-GC-MS and HPLC. The results showed that ozone(O3) and H2O2 can be effecti ve to remove UV254 but less effective to remove TOC . The removal of UV254 and TOC by H2O2 could be improved as some catalysts wre applie d. O3 among the catalysts was the best, and Fe2+ was better, and th en Mn2+ and Cu2+ were worse. Both the ozonation and hydrogen peroxid e catalytic oxidation resulted in the fragmentation of the macro molecules to sm aller ones, and the organic matters with functional groups of carboxyl, hydroxyl, ketone, ether, ester and some chain hydrocarbon were increased after oxidation . The result of this study also indicated that ozonation and hydrogen peroxide oxidation can improve the treatability of coa-gulation and activated adsorpt ion.
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