Study On Phosphorus Removal From Wastewater By Micelle-Enhanced Ultrafitration

With industrial development, eutrophi cation causing by phosphorus-containing wastewater is becoming more and more serious, and it has great harm to human health and living beings. Thus, treatment of phosphorus wastewater has important practical significance. There have been various kinds of treatment methods for phosphorus wastewater. However, each one has its own shortcoming and weakness. Micelle-enhanced ultrafitration (MEUF) is a new type of membrane water treatment technology, which is a practical and efficient treatment method for micro-polluted water.In this study, MEUF technology is used to handle the wastewater of TP content between5-600mg/L, with CTAB and CPC as surfactant and hollow fibre ultrafiltration membrane as polysulfone material. Five parameters are used to examine the impact of TP treatment effect, which include standing time, permeation flux, concentrations of SAA, and mole ratio (TP: SAA). The main conclusions are as follows:(1)The PO43-adsorption to CTAB or CPC micelle reached equilibrium at1h. but long setting time will cause micelle desorption. The best setting time was1h;(2) Taking CTAB and CPC as surfactant, the MEUF technology was used for phosphorus wastewater treatment. When the permeation flux was slow, it would generate concentration polarization, and the removal rate of TP was low; When the permeation flux was high, the pressure would rise, and the separation prosperities of the recession of the ultrafiltration membrane components would increase, which decreased the removal rate of TP and raised the concentrations of surfactant in penetrants. It showed that it will be appropriate when permeation flux is0.34L/hm2(CTAB) or0.5L/hm2(CPC);(3) Under the optimal conditions of setting time and permeation flux, CTAB and CPC were used respectively in MEUF to deal with the wastewater which TP concentration was100mg/L-600mg/L. When TP:CTAB (mole ratio)≈2, TP:CPC≈1.3, removal rate of TP reached above94%and95%respectively;(4) When using CTAB in MEUF to deal with the wastewater with TP concentration below10mg/L, and TP:CTAB (mole ratio)≤1.8, concentration of surfactant in penetrantes below0.5mg/L, the highest removal rate of TP could achieve95.12%. The discharged water could reach the national "Integrated Wastewater Discharge Standard (GB18918-2002)" in an A standard; When using CPC in MEUF to deal with the wastewater which TP concentration is below20mg/L. and TP:CTAB (mole ratio)≤1.2, concentration of surfactant in penetrates below0.5mg/L,the highest removal rate of TP could reach96.46%.