Removal of manganese from waste water by complexation-ultrafiltration using copolymer of maleic acid and acrylic acid
(1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, Changsha 410083, China)
2. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, Changsha 410083, China)
Abstract: Copolymer of maleic acid and acrylic acid (PMA-100), combining with polyvinyl butyral (PVB) ultrafiltration membrane was used for the removal of Mn(II) from waste water by complexation-ultrafiltration. The carboxylic group content of PMA-100 and the rate of complexation reaction were measured. Effects of the mass ratio of PMA-100 to Mn(II) (n), pH, background electrolyte, etc on the rejection rate (R) and permeate flux (J) were investigated. The results show that carboxylic group content of PMA-100 is 9.5 mmol/g. The complexation of Mn(II) with PMA-100 is rapid and completed within 5 min at pH 6.0. Both R and J increase with pH increasing in the range of 2.5-7.0, and R increases with the increase of n at pH 6.0 while J is little affected. The background electrolyte leads to the decrease of R, and CaCl2 has much greater effect on R than NaCl at the same ionic strength.
Key words: complexation-ultrafitration; copolymer of maleic acid and acrylic acid; poly (vinyl butyral) hollow fiber membrane; manganese; wastewater treatment