| 초록 |
The performance of nanofiltration (NF) with and without the addition of poly (acrylic acid) (PAA) for treatment of Co- and Sr-bearing nuclear wastewater was investigated using different NF membranes at various pH levels and PAA/Sr ratios. Greater removal at elevated pH was attributed to the formation of carbonate-based precipitates due to the dissolution of atmospheric CO2. A substantial improvement in Sr removal was achieved by the addition of PAA that can make complexes with strontium ions and then be rejected by NF membranes. However, a decrease in feed solution pH aggravated the fouling of a NF membrane, possibly because of the sorption of associated forms of PAA at the membrane surface. |
