AI Article Synopsis
- The study examined the impact of ten extraction methods on the flocculation activity and chemical composition of bio-flocculants from sludge in bio-filtration units.
- Results indicated that chemical extraction methods, particularly using EDTA, were significantly more effective than physical methods in terms of both the yield and flocculation performance of bio-flocculants.
- The optimal concentration of EDTA for extracting bio-flocculants was found to be 5 g/L, resulting in high flocculation activity, suggesting that bio-filtration sludge could be a valuable resource for bio-flocculants.
Article Abstract
Effect of ten extraction methods on flocculation activity and chemical composition of bio-flocculants recovered from backwashed sludge of bio-filtration unit was studied. The results showed that the chemical method was better than physical method with respect to the extracted BFs weight and its flocculation activity. Cell lysis did not affect to the flocculation activity of BFs. Among ten extraction methods, EDTA (20 g/L) was the best one with extracted BFs dry weight of 6242 mg/L and flocculation activity of 83%. Optimization of EDTA concentration showed that 5 g EDTA/L (or 0.2 g EDTA/g SS) was suitable for recovery of BFs from backwashed sludge. The flocculation activity of BFs was 94% when using 2.4 mg of BFs/g of kaolin. The outcome of this study suggested that backwashed sludge of the bio-filtration unit was a potential source for exploiting bio-flocculants.
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| http://dx.doi.org/10.1016/j.jenvman.2016.05.051 | DOI Listing |
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