内循环式泡沫浮选塔处理含铬废水

采用自制的内循环泡沫浮选塔处理含铬废水，考察pH值、Fe(NO3)3浓度、十二烷基硫酸钠(SDS)浓度、气体流量、分离时间等因素对分离效率的影响，并与常规泡沫塔比较. 结果表明，在12~35 min内，内循环式浮选塔分离效率更高，35 min时塔内铬离子浓度为0.6 mg/L，常规泡沫塔内铬离子浓度为10 mg/L. 内循环浮选塔最佳分离工艺条件为，对初始铬浓度为20 mg/L的废水，在pH 5.5、SDS 100 mg/L、Fe(NO3)3 60 mg/L、气体流量800 mL/min条件下处理效果最好，泡沫夹带率约为10%，Cr(III)脱除率可达97%以上.

Treatment of Wastewater Containing Chromium Ion by Intermittent Foam Fractionation

Using a homemade inner circulating foam fractionation column, simulated wastewater containing Cr ion was treated and compared with a conventional bubble tower in its separation efficiency, and the influential factors pH value, Fe(NO3)3, concentration of sodium dodecyl sulfate (SDS), gas flow and separation time were examined. The results show that the circulating flotation column separation efficiency is higher within 12 to 35 min, Cr ion concentration reaches 0.6 mg/L in the fractionation in 35 min, but 10 mg/L in the conventional bubble column. The optimum operating conditions of inner loop flotation column are obtained, for the initial Cr ion concentration of 20 mg/L in waste water, under pH 5.5, SDS 100 mg/L, Fe(NO3)3 60 mg/L, and gas flow rate of 800 mL/min, the treatment effect is preferable. The bubble entrainment rate is about 10%, and Cr(III) removal rate over 97%.