Method for treating cadmium-containing waste water by intensified ultrafiltration of hollow fiber ultrafiltration membrane and foam floatation
An ultrafiltration membrane and foam technology, applied in chemical instruments and methods, flotation water/sewage treatment, water/sewage treatment, etc., can solve the problems of high operating pressure, not widely used, secondary pollution, etc., to reduce the use of amount, good removal effect, and the effect of improving the removal rate
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Embodiment 1
[0012] Embodiment 1: when measuring the cadmium ion concentration in the waste water is 50mg / L, add 6.25 * 10 -3 mol / L of SDS, stirred evenly, and left to stand for 2 hours, then sent to the hollow fiber ultrafiltration membrane module for filtration by a peristaltic pump. The air is blown in, and the bubbles carrying cadmium ions float up and flow out from the foam outlet at the top of the air flotation column, and the water is discharged from the bottom outlet of the air flotation column, in which the concentration of cadmium ions meets the requirements of the "Integrated Wastewater Discharge Standard" (GB8978-96). The material of the ultrafiltration membrane is polyethersulfone, the molecular weight cut-off of the membrane is 6000-10000Dalton, the operating pressure of the membrane is 0.07Mpa, the flow rate of wastewater is 5L / s, the pore size of the aeration head of the air flotation column is 20μm, the flow rate of air is 100L / h, and the foam stays for 15min . The concen...
Embodiment 2
[0014] Embodiment 2: when measuring the cadmium ion concentration in the waste water is 50mg / L, add 3 * 10 -3 mol / L of SDS, stirred evenly, and left to stand for 2 hours, then sent to the hollow fiber ultrafiltration membrane module for filtration by a peristaltic pump. The air is blown in, and the bubbles carrying cadmium ions float up and flow out from the foam outlet at the top of the air flotation column, and the water is discharged from the bottom outlet of the air flotation column, in which the concentration of cadmium ions meets the requirements of the "Integrated Wastewater Discharge Standard" (GB8978-96). The material of the ultrafiltration membrane is polyethersulfone, the molecular weight cut-off of the membrane is 6000-10000Dalton, the operating pressure of the membrane is 0.07Mpa, the flow rate of wastewater is 5L / s, the pore size of the aeration head of the air flotation column is 20μm, the flow rate of air is 60L / h, and the foam stays for 15min . The concentrat...
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