Alginate enhanced ultrafiltration for treatment of lead-containing wastewater
海藻酸钠-超滤组合处理含铅废水

Micellar-enhanced ultrafiltration (MEUF) usually takes surfactants as the additional organics and it may cause secondary pollution and cost expensively. Alginate as a kind of natural organic was used in the MEUF process and the effective factors and characteristics were investigated in this paper. The experimental results showed that the adsorption process of between alginate and lead could be expressed by the Freundlich isotherm model. The infra-red spectrum analysis on the alginate and the alginate-Pb compound demonstrated that the OC-OH group taken great effects on the adsorption process. The UF membranes with MWCO 4 kDa,6kDa, 10 kDa, 30 kDa, 50 kDa, 70 kDa could remove the lead ion with the efficiency of more than 95% under the conditions of the initial Pb2+ concentration less than 40 mg/L, the alginate concentration of 100 mg/L, pH=7. The lead rejection rate increased with the pH increasing. More than ninety-nine percent of the total lead in the concentrated solution could be recovered by increasing the pH value to 13.