Enhanced biodiesel production from glucose-fed activated sludge microbial cultures by addition of nZVI and FeCl3. Issue 91 (16th September 2016)

• Record Type: Journal Article
• Authors: Huang, Xiang-Feng; Shen, Yi; Wang, Yi-Han; Liu, Jia-Nan; Peng, Kai-Ming; Lu, Li-Jun; Liu, Jia
• Is Part Of: RSC advances. Volume 6:Issue 91(2016)
• Page Start: 88727
• Page End: 88735
• Publication Date: 2016-09-16
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra17659c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Addition of iron simultaneously promoted biodiesel production and biotechnical feasibility. Abstract : The effect of different iron additives on biodiesel production from activated sludge was investigated under an optimal lipid accumulation condition (pH = 4 & C/N = 100). Iron addition, ranging from 0.1 to 2.5 mmol L −1, had a positive effect on biodiesel production. Among separate iron tests, 0.25 mmol L −1 nZVI and 2.5 mmol L −1 FeCl3 performed the best. The gravimetric fatty acid methyl ester yields of the two treatments reached 215.3 (0.25 mmol L −1 nZVI) and 274.9 mg g −1 dry sludge (2.5 mmol L −1 FeCl3 ) and increased by 36.1% and 74.0% compared with control run (131.0 mg g −1 dry sludge), respectively. At the end of the culture period, the genus Gluconacetobacter (56.4%) was enriched in the sludge under the 2.5 mmol L −1 FeCl3 treatment while the other treatments were only dominated by Gluconobacter (∼80%). The accumulated lipids mainly contained around 60% of monounsaturated fatty acids, indicating the suitability for biodiesel production. Furthermore, indicators related to production costs showed iron addition could notably improve the biotechnical feasibility.