Development Of A Novel Low Phosphorus RO Membrane Scale Inhibitor And Researches On Its Properties

By the virtue of low run expense, no regenerative waste water drain, steady product water quality, RO has gradually substituted ion-exchange in the market. But the sediment of scale on RO membrane seriously affects run energy loss and RO membrane life. So it is worth developing a novel and high efficient RO scale inhibitor.Based on the research into the scale inhibition of four monomers, a novel RO membrane scale inhibitor - confected scale inhibitor is developed by filtrating and mixed formulation. The phosphate in confected scale inhibitor is about 1/3 of MDC220. It can efficiently control microbial pollution and eutrophication of concentrated water to let.The result in the static experiment show that PBTC is best for inhibiting CaCO₃, HPMA is best for CaSO₄, JN-518 is good for CaCO₃ and CaSO₄, ZF-322SG is best for Ca₃(PO₄)₂ and the dispersing for Iron trioxide. The confected scale inhibitor is better than PTP—0100, MDC220 in the effect of inhibiting the formation of CaCO₃, CaSO₄,Ca₃(PO₄)₂ and the dispersing for Iron trioxide.In order to research the stabilizing performance of confected scale inhibitor to scale, scale inhibitor is used in the water containing diverse concentration of hardness, alkalinity to test the influence of above factor to the performance of scale inhibitor. The result show that the effect of inhibiting the formation of scale decreases with the increase of the hardness. When Ca²⁺ is 250mg/L, scale inhibition rate is 87.5%. WhenCa²⁺ is 1500mg/L, scale inhibition rate is 70%. Alkalinity has the same effect. When HCO₃^- is 250mg/L, scale inhibition rate is about 100%. When HCO₃^- is 1500mg/L, scale inhibition rate decreases to 52.0%.This article also studies the effect of inhibiting scale by simulating the actual water quality and the practical run parameter on the reverse osmosis,the result indicate that confected scale inhibitor can effectively inhibit the formation of scale and the sediment of scale on RO membrane. When the initial Ca²⁺ is 1200mg/L, Ca²⁺ in the water containing confected scale inhibitor is 750mg/L, being higher than the Ca²⁺ in blank water (450mg/L). Moreover the effect of confected scale inhibitor is better than PTP-0100, MDC220.The calcium tolerance of the confected scale inhibitor, PTP—0100, MDC220 are determined finding that the confected scale inhibitor is the highest(344.26mg/L) ,the...