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运用荧光检测和光散射颗粒分析仪(PDA)在线监测技术对FeCl3与腐殖酸的混凝机理进行研究。结果表明,FeCl3投量的增加可使混凝去除腐殖酸的有效pH范围由弱酸性变成中性;在弱酸性条件下,FeCl3的水解产物主要为带正电荷的低、中聚合形态,吸附电中和以及共聚络合作用是FeCl3与腐殖酸的主要混凝机理;在中性条件下,FeCl3的水解离子和腐殖酸的主要官能团之间的络合作用与水解反应存在竞争,因此,FeCl3的水解产物对腐殖酸分子的吸附电中和及络合作用无法有效去除腐殖酸,而是通过氢氧化铁沉淀物对腐殖酸的吸附和网扫作用达到这一目的。
The flocculation mechanism of FeCl3 and humic acid was studied by on-line fluorescence monitoring and light scattering particle analyzer (PDA). The results showed that the effective pH range of coagulation to remove humic acid could be changed from weak acidity to neutrality by the increase of the dosage of FeCl3. The hydrolyzate of FeCl3 was mainly in the form of low- Adsorption neutralization and copolymerization are the main coagulation mechanisms of FeCl3 and humic acid. Under neutral conditions, the complexation between the hydrolyzed ions of FeCl3 and the main functional groups of humic acid competes with the hydrolysis reaction, Therefore, the hydrolysis of FeCl3 humic acid molecules adsorbed on the electricity and complexation can not effectively remove humic acid, but by iron hydroxide precipitate on the adsorption of humic acid and net sweep to achieve this goal.