Heterogeneous carbon dot catalysts for biodiesel production: A mini review

Tracey, Chantal T.; Shavronskaya, Darya O.; Shao, Jing'ai; Yang, Haiping; Krivoshapkin, Pavel V.; Krivoshapkina, Elena F.

doi:10.1016/j.fuel.2024.130882

Cited by 4 publications

(1 citation statement)

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“…Biodiesel is a mixture of fatty acid methyl esters (FAMEs) produced mainly by the transesterification of refined vegetable oils in the presence of alkaline catalysts [42,43]. To reduce the use of renewable energy sources and the cost of biodiesel production, alternative, less expensive feedstocks have been used, such as waste oils [44,45], animal fats [46,47] and oils from macro-and microalgae [48,49]. In this context, sewage sludge represents a possible alternative source of lipids that meets sustainability criteria [50,51].…”

Section: Introductionmentioning

confidence: 99%

Energy Recovery from Municipal Sewage Sludge: An Environmentally Friendly Source for the Production of Biochemicals

di Bitonto,

Angelini,

Pastore

2024

Applied Sciences

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In this work, a detailed analysis of the lipid component in primary sludge and sewage scum up-taken from several wastewater treatment plants located in southern Italy was carried out. Lipids in the primary sludge accounted for 200–250 mg/g of the total solids (TS), with calcium soaps as a main component (70–82%), while total lipids made up about 350–500 mg/gTS in the sewage scum and consisted mainly of FFAs (45–60%) and calcium soaps (27–35%). In addition, estolides and 10-hydroxystearic acid were also quantified. A specific valorization process was then developed and tested for either primary sludge or sewage scum. In detail, lipids were first recovered, chemically activated by the addition of acids (calcium soaps were converted to free fatty acids) and finally reacted with methanol to obtain methyl esters. The lipid recovery from primary sludge and sewage scum was particularly efficient (recoverability of 92–99%). The conversion of the starting acids into FAMEs (yield > 98%) was achieved under very mild conditions (70 °C, 2 h) with AlCl3·6H2O as a catalyst. Biodiesel (according to EN14214), methyl 10-hydroxystearate and methyl estolides were efficiently isolated by distillation under vacuum. Finally, a feasibility study of the proposed processes was carried out to evaluate their possible integration into a wastewater treatment plant, critically analyzing both the positive aspects and the relative limitations.

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