Evaluation of commercial reverse osmosis and nanofiltration membranes for the removal of heavy metals in water sources from the Democratic Republic of Congo
(2022) Water Symposium — Location: Aula Magna, Louvain-La-Neuve (BE) (31.March.2022)
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- Abstract
- This study evaluates the performance of commercial reverse osmosis (RO) and nanofiltration (NF) membranes for the removal of metal ions from synthetic industrial wastewater and household wastewater carried from the north-west of Tanganyika Lake in the city of Uvira, in the east of the Democratic Republic of Congo. RO membranes showed higher rejection of metal ions from the synthetic samples prepared in the laboratory as well as from the raw water collected from the surroundings of the Tanganyika Lake, reaching rejections higher than 98% for Cr, Pb, Cd, As, Ni, and Sb ions in the synthetic industrial solutions, and 99.2, 98.8, 98.6, 99.2, 98.4 and 98.8% respectively in real samples. The ions concentrations decreased in the permeates of RO, NF90 and NF270 respectively from 0.15 to 1.02 mg/L; 0.33 to 22 mg/L and 0.11 to 22 mg/L. Regarding the NF membranes, their rejection was lower: 98.2, 76.9, 92.3, 52.5, 97.8, and 64.1% for Cr, Pb, Cd, As, Ni, and Sb ions, respectively, but the flux was 329 to 375 L/hm2 higher compared to RO membranes was 98 to 132 L/hm2. The studied membranes are thus a feasible solution to remove the studied metals from real wastewater sources at low concentration since they meet the water quality standards recommended by the World Health Organization. The reverse osmosis membrane is best suited for high concentration synthetic waters.
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Citations
Kapepula Lumami, V., Luis Alconero, P., & Dieudonné, M. (2022). Evaluation of commercial reverse osmosis and nanofiltration membranes for the removal of heavy metals in water sources from the Democratic Republic of Congo. Water Symposium, Aula Magna, Louvain-La-Neuve (BE). https://hdl.handle.net/2078.5/107584