Ho Y C, Norli I, Alkarkhi Abbas F M, Morad N
School of Industrial Technology, Universiti Sains Malaysia, 11800 Minden Pulau Pinang, Malaysia.
Water Sci Technol. 2009;60(3):771-81. doi: 10.2166/wst.2009.303.
The performance of pectin in turbidity reduction and the optimum condition were determined using Response Surface Methodology (RSM). The effect of pH, cation's concentration, and pectin's dosage on flocculating activity and turbidity reduction was investigated at three levels and optimized by using Box-Behnken Design (BBD). Coagulation and flocculation process were assessed with a standard jar test procedure with rapid and slow mixing of a kaolin suspension (aluminium silicate), at 150 rpm and 30 rpm, respectively, in which a cation e.g. Al(3+), acts as coagulant, and pectin acts as the flocculant. In this research, all factors exhibited significant effect on flocculating activity and turbidity reduction. The experimental data and model predictions well agreed. From the 3D response surface graph, maximum flocculating activity and turbidity reduction are in the region of pH greater than 3, cation concentration greater than 0.5 mM, and pectin dosage greater than 20 mg/L, using synthetic turbid wastewater within the range. The flocculating activity for pectin and turbidity reduction in wastewater is at 99%.
采用响应面法（RSM）测定了果胶在降低浊度方面的性能及最佳条件。在三个水平下研究了pH值、阳离子浓度和果胶用量对絮凝活性和浊度降低的影响，并采用Box-Behnken设计（BBD）进行优化。通过标准的烧杯试验程序评估混凝和絮凝过程，将高岭土悬浮液（硅酸铝）分别以150转/分钟和30转/分钟的速度快速和慢速搅拌，其中阳离子如Al(3+)作为混凝剂，果胶作为絮凝剂。在本研究中，所有因素对絮凝活性和浊度降低均表现出显著影响。实验数据与模型预测结果吻合良好。从三维响应面图可知，在该范围内使用合成浑浊废水时，最大絮凝活性和浊度降低出现在pH值大于3、阳离子浓度大于0.5 mM且果胶用量大于20 mg/L的区域。果胶对废水的絮凝活性和浊度降低率达99%。
