采用微纳米气泡混凝气浮处理合肥塘西河藻水分离港新鲜藻水和陈藻水,考察混凝剂、停留时间等因素对微纳米气泡气浮藻水分离的影响。通过与分离港实际运行的加压溶气气浮法比较,研究最佳处理效果的试验参数,以期获得最佳的工艺条件。结果表明新鲜藻水和陈藻水使用混凝剂PAC的最佳用量分别为24,36 g/m³,气浮池最佳停留时间分别为30,40 min,对应的处理效果最好;新鲜藻水总磷(TP)、总氮(TN)、化学需氧量(COD)、悬浮物(SS)去除率分别达到96.50%,53.10%,85.70%,99.00%,陈藻水TP,TN,COD,SS去除率可分别达到98.40%,62.40%,65.60%,99.80%。微纳米气泡法处理效果优于加压溶气气浮法。

Micro-nano bubble coagulation and air flotation process was adopted to treat the fresh and stale algae-laden waters coming from the algae and water separation port of Tangxi River in Hefei. Effects of coagulant and air retention time on the separation of algae and water were investigated. Through comparing the method with pressurized dissolved-air flotation which is in operation at present in the separation port, experimental parameters of the best treatment effect were explored to achieve the optimal process conditions. Results showed that the optimal dosage of coagulant PAC for fresh and stale algae-laden waters was 24 g/m³ and 36 g/m³, respectively, and the optimum air retention time in floatation pool was 30 min and 40 min,respectively. The removal rates of total phosphorus(TP), total nitrogen (TN), chemical oxygen demand (COD) and suspended solids (SS) of fresh algae-laden water reached 96.50%, 53.10%, 85.70%, 99.00%, respectively. And the removal rates of TP, TN, COD and SS of stale algae-laden water reached 98.40%, 62.40%, 65.60%, 99.80%, respectively. The treatment effect of micro-nano bubble air flotation was better than that of pressurized dissolved-air flotation.