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生物质灰渗出金属离子在TMP废水处理中的作用

     

摘要

In the process of thermomechanical pulping(TMP) effluent treatment using wood based fly ash (FA) as reactant, inorganic metallic ions can exude into the effluent from FA complex. In order to determine the metallic elements in FA would flocculate and remove the organics in the effluent under the alkaline condition, the removal behaviors of organic material were investigated by means of simulation with different kind of metallic ions addition at various dosage levels and adjusting pH value of TMP effluent, respectively. It concluded that the metallic ions combined with organics precipitate simultaneously under the alkaline condition by charge neutralization and H-bond to form large particles. The removal rates increased with the increment dosage of Mg2+ and Fe3+,while the Ca2+ and Al3+ would not be affected by their dosage under the alkaline condition. When the pH values were 10 and 12, respectively, the removal capability of Ca2+and Mg2+ was maximum at pH value 12, while Al3+ achieved peak removal rate at pH 10. The removal efficiency from Fe3+ kept constant between pH value 10 and 12.%在使用生物质灰(FA)处理热磨机械浆(TMP)废水过程中,FA中的金属离子会渗到废水中.为探讨FA中的金属离子与废水中有机物质絮凝对去除废水中有机物的辅助作用,考察生物质灰对TMP废水中有机物去除率的基础上,在模拟的碱性条件下探索了不同金属离子用量和pH值对废水中絮凝颗粒分布及有机物去除的影响.结果发现:金属离子在碱性条件下形成颗粒,与废水中的有机物通过电中和、氢键结合形成更大的颗粒,从而去除废水中的有机物;Mg2+和Fe3+的用量越大有机物的去除率越高,而Ca2+和Al3+不受用量的影响;Ca2+和Mg2+在pH值为12时,有机物去除率较高,Al3+在pH值为10时,有机物去除率较高,而Fe3+去除废水中的有机物几乎不受pH值影响.

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