摘要
用铝盐作为水处理絮凝剂所产生的化学污泥往往含有大量的铝,对其综合利用,既能节省资源,又能避免二次污染。pH值是从化学污泥中浸提铝的关键影响因素,铝只有在pH值<1.7(酸浓度>0.02mol/L)时才能溶出,当酸浓度增加到4.0mol/L(pH值=0.6)时,铝溶出率最大。在酸性环境中,铝溶出时间很短,一般在4min后就达到了溶解平衡。搅拌与提高温度都能提高铝的溶出率。污泥中含有或向其中加入不同官能团小分子化合物也是铝溶出的强化条件,特别是含有-OH或含-OH与-NH2有机物共存时对铝的增溶效果最明显,一般可增溶10%以上,并可使铝溶出的pH值<1.7的上限延伸到3.0左右。
The chemical sludge from water treatment plant contain much aluminum when using aluminumbased coagulation.Its comprehensive utilization can not only economize resource but also avoid secondary pollution.The key factor of extracting aluminum from the chemical sludge is pH value.Commonly,when pH〈l.7 （acid concentration〉0.02mol/L）,the aluminum in sludge will be dissolved,and when acid concentration increase at 4.0mol/L,extraction can reach the largest amount.the reaction can reach balance rapidly in acidic circumstance in 4 minutes.Stir and temperatures elevation can also enhance the dissolution rate of aluminum. Different functional groups of small molecular organic matters in sludge ,that is an important intensification condition, especially organic extent the upper boundary matters contains -OH and-NH2, can of pH from 1.7 to about 3.0 solubilize above 10%.Moreover,it also can
出处
《中外能源》
CAS
2007年第1期100-103,共4页
Sino-Global Energy
基金
CURE基金(2001
2002)
"211工程"学科建设项目(编号:R2317312)
关键词
铝
化学污泥
酸处理
污水处理场
aluminum
chemical sludge
acid treatment
water treatment plants
作者简介
周恩红，苏州大学化学化工研究院在读硕士。主要研究方向为工业废水处理技术与理论。
