Abstract:

The decoloration property of several complex flocculants for active dyeing wastewater is discussed. When the concentration of PAM cationis 50%, 1mg/LPAM will promote the decolouration to be over 90%. The supe rabundant cations will cause the colloid stable again. The excellent decolouration rate can be obtained while 1 mg/L PAM (Mw=1.2×10 7 ) and 150 mg/L PAC is complex. The overlong molecular chain can produce the repulsion between particles because of the sterically hindered effect. The decolouration of 1 mg/L CTS + 100 mg/L PAC is over 90%. The redundant CTS molecular can not elaborate effect for the adsorptive space is already saturated. It is observed by SEMthat the flocculus produced with PAC is continuous, and the one produced by several polymeric flocculants is different. The much larger specific surface area can enhance the bridging and sweeping effect to the particles.

Key words: polyacrylamide, chitosan, polyaluminum chloride, flocculants, decolouration

摘要：

就几种高分子复合絮凝剂对活性染料废水的脱色性能进行了研究。当聚丙烯酰胺(PAM)的阳离子度为50%时，脱色率可达到90%以上，过多的阳离子会导致胶体颗粒重新稳定；1mg/L相对分子质量为1.2×107的PAM与150mg/LPAC复合可达到98.2%的最佳脱色效果，分子链过长的PAM分子由于空间位阻效应使颗粒间互相排斥；1mg/L壳聚糖(CTS)与100mg/LPAC复合后脱色率即可大于90%，过多的CTS分子因吸附空位的饱和无法发挥作用。通过SEM观察发现在PAC单纯的电中和作用下，絮体呈较为平坦的均匀连续絮状形态。加入有机高分子絮凝剂后，由于分子链的桥联卷扫作用，呈现出不同特点的聚集形态，形成比表面很大的絮体，从而强化对颗粒的吸附和架桥作用。

关键词: 聚丙烯酰胺, 壳聚糖, 聚合氯化铝, 絮凝剂, 脱色

CLC Number: 

• TQ314.253

• X703.1