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中文摘要：
引言 随着制浆造纸行业废水循环回用和零排放不断强化，非过程金属元素在过程流中不断富集。酸性漂白段的洗涤废水回用至碱性纸浆的过程中可以形成一个“金属陷阱”，酸性条件下金属阳离子可以和溶液中的H^＋进行离子交换，从纸浆中解吸出来；解吸出来的金属离子在碱性条件下再次与H^＋进行离子交换，又重新吸附在纸浆上。金属离子在纸浆漂白过程中完成吸附／解吸过程。
英文摘要：
Catalytic decomposition of hydrogen peroxide in alkaline solutions in the presence of different states of Fe（Ⅲ）,free Fe（Ⅲ） in solution and adsorbed Fe（Ⅲ） with cellulose,was studied.The individual and combined roles of DTPA,magnesium sulphate,and sodium silicate as stabilizers for alkaline hydrogen peroxide were also investigated.The most effective way to control decomposition of hydrogen peroxide induced by Fe（Ⅲ） under conventional hydrogen peroxide brightening conditions was examined.The results showed that free Fe（Ⅲ） in solution was present in the form of Fe2O3 crystal structure.Adsorbed Fe（Ⅲ） with cellulose was formed when free Fe（Ⅲ） in solution adsorbed on the surface of cellulose fiber or filled into hollow fiber.Free Fe（Ⅲ） in solutions stabilized hydrogen peroxide,while adsorbed Fe（Ⅲ） with cellulose activated the decomposition of hydrogen peroxide.In the presence of free Fe（Ⅲ） under alkaline condition,DTPA and MgSO4 were effective in reducing the catalytic decomposition of peroxide and the decomposition rates of hydrogen peroxide were decreased to 25% and 50%,respectively.In the presence of adsorbed Fe（Ⅲ） with cellulose,DTPA,magnesium sulphate,and sodium silicate did not have any protective influence to hydrogen peroxide,and the decomposition rate of peroxide was over 80% within 1 h.
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