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首页> 外文期刊>Separation and Purification Technology >Dissociation and removal of complex chromium ions containing in dye wastewaters
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Dissociation and removal of complex chromium ions containing in dye wastewaters

机译：解离和去除染料废水中所含的复杂铬离子

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Heating and acidification as pretreatment were used to dissociate chromium-azo complexes into simple ions Cr~(3+),which then were precipitated as Cr(OH)_3 using neutralization-flocculation method.The combined method significantly increased the treatment efficiency for dye wastewater containing chromium complexes.Temperature and acidity have obvious influence on the thermodynamic stability of the complexes.The results showed that yellow or orange chromium complex containing aromatic carboxyl group could be easily destroyed by either heating or acidification.However,for more stable black chromium complex,the destruction of complex is accomplished by both heating and acidification.The residual chromium in the wastewater was dropped below 1.0 mg/L after acidification,preheating,and neutralization-flocculation.
机译：采用加热和酸化预处理将铬-偶氮配合物解离成简单的离子Cr〜（3+），然后用中和絮凝法将其沉淀为Cr（OH）_3。联合方法大大提高了染料废水的处理效率。温度和酸度对配合物的热力学稳定性有明显影响。结果表明，含有芳香族羧基的黄色或橙色铬配合物很容易被加热或酸化破坏。但是，对于更稳定的黑色铬配合物，经过酸化，预热和中和-絮凝后，废水中的残留铬降至1.0 mg / L以下。

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