吸气浮选处理含油污水适用药剂的评价

EVALUATION OF APPROPRIATE CHEMICALS FOR INDUCED-AIR FLOTATION DEPURATOR

吸气浮选用于处理含油污水吸入气体量多.气泡直径大.水中分散油滴的脱除是基于大气泡夹带小油滴浮升分离而完成的.用四种药剂对两种含油污水进行分离处理.考察了不同药剂类型和用量的处理效果.实验证明,有效的药剂及适宜用量能降低油滴与气泡的电位,增加有效碰撞.促进细小油滴聚结絮凝.降低气泡直径.依据机理分析建立的动力学模型中的捕集因数、极限脱除浓度及气泡直径等参数可作为这些作用的评价指标.

The induced-air flotation (IAF) depurator can produce more bubbles with larger magnitude than the bubbles of the dissolved-air flotation (DAP) depurator. In the IAF depurator, oil particles and suspended solids singly attach to the gas bubbles and rise with them. The appropriate chemicals of the IAF depurator must be provided with the effects of collection, coalesscence, and frothiness. Based on a kinetic model established in the light of mechanism analysis of the IAF depurator, the catching factor and the critical removal concentration are regarded as the evaluation index of the appropriate chemicals. A calculation method for predicting the oil removal efficiency of IAF depurator with chemicals was developed.