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Journal AWWA - Using Coagulants to Remove Organic Matter AWWA杂志-使用混凝剂去除有机物
发布日期: 2000-11-01
本研究考察了在饮用水处理中通过混凝去除有机物(OM)。首先,测定了三种混凝剂同时降低浊度和去除水中有机物的能力。测试的混凝剂为商业产品明矾和聚合氯化铝(PACl)以及作者实验室合成的聚羟基硫酸铝(PAHS)。单宁酸、腐殖酸、木质素磺酸和水杨酸(SAL)被用作冷水和温水中的模型有机化合物。还考察了单宁酸浓度的影响,确定了OM浓度与所需混凝剂用量之间的半定量关系。 在冷水中,PACl和PAHS是除SAL之外的所有有机化合物的有效混凝剂(SAL本身并没有被去除,尽管它并没有抑制浊度降低)。然而,明矾在有或没有OM的情况下是一种较差的凝固剂。在温水中,明矾和PACl是更有效的混凝剂。OM在两种温度下对alumat的影响大致相同,但在温水中对PACl的影响有所增加。虽然多环芳烃在没有有机物或存在SAL的情况下有效地降低了浊度,但其他有机物的存在大大增加了温水中的混凝剂需求。 包括23个参考文献、表格和图表。
This study examined removal of organic matter (OM) by coagulation in drinking water treatment. First, the ability of three coagulants to simultaneously reduce turbidity and remove OM from water was determined. The coagulants tested were the commercial products alum and polyaluminum chloride (PACl) and a polyaluminum hydroxysulfate (PAHS) synthesized in the authors' laboratory. Tannic, humic, lignosulfonic, and salicylic acids (SAL) were used as model organic compounds in cold and warm water. The effect of the concentration of tannic acid was alsoexamined, and semi quantitative relationships between OM concentration and coagulant dosage required were determined. In cold water, PACl and PAHS were efficient coagulants for all organic compounds except SAL (which was not itself removed, although it did not inhibit turbidity reduction). However, alum was a poor coagulant in the presence or absence of OM. In warm water, alum and PACl were the more efficient coagulants. OM had approximately the same effect on alumat both temperatures, but its effect on PACl was somewhat increased in warm water. Although PAHS effectively reduced turbidity in the absence of OM or in thepresence of SAL, the presence of the other organic substances greatly increased the coagulant demand in warm water. Includes 23 references, table, figures.
分类信息
发布单位或类别: 美国-美国给水工程协会
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