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Silica removal from newsprint mill effluents with aluminum salts

机译:用铝盐去除新闻纸厂废水中的二氧化硅

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摘要

The main obstacle for the implementation of reverse osmosis (RO) in a treatment chain to reuse the effluent of a newsprint mill as fresh water is the high silica content of the water, which produces severe scaling on the membrane, thus, limiting its recovery. Coagulation is one of the preferred methods to reduce silica concentration. Five udaluminum based coagulants have been tested at five dosages (500-2500 ppm) and three pHs (8.3, 9.5 and 10.5). All products showed their best efficiency at the highest dosage and pH, with the exception of alum, that was more efficient at intermediate dosages. A combination of a polyaluminum nitrate sulphate with a cationic quaternary polyamine PANS-PA2), was the most efficient and versatile coagulant. It removed 97% of silica (5 ppm residual silica) at the optimal conditions (pH 10.5, 2500 ppm) and it was very efficient (76% silica removal) at pH 8.3, avoiding the need of any pH adjustment, and minimizing the conductivity and pH increase of the treated waters as well as obtaining some removal of the organic colloidal matter (≈25%).
机译:在处理链中实施反渗透以重新利用新闻纸厂的废水作为淡水的主要障碍是水的二氧化硅含量高,这会在膜上产生严重的水垢,从而限制了其回收率。混凝是降低二氧化硅浓度的优选方法之一。在五种剂量(500-2500 ppm)和三种pH值(8.3、9.5和10.5)下测试了五种基于uda的凝结剂。除明矾外,所有产品均在最高剂量和pH值下表现出最佳效率,而在中等剂量下则更为有效。聚硝酸铝硫酸盐和阳离子季铵多胺PANS-PA2的组合是最有效和用途最广泛的凝结剂。在最佳条件(pH 10.5,2500 ppm)下,它去除了97%的二氧化硅(5 ppm残留二氧化硅),并且在pH 8.3下非常有效(去除了76%的二氧化硅),无需进行任何pH调节,并最大程度地降低了电导率处理水的pH值增加,有机胶体物质(≈25%)的去除率也有所提高。

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