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- Title
Value-Added Products from Urea Glycerolysis Using a Heterogeneous Biosolids-Based Catalyst.
- Authors
Bartoli, Mattia; Chengyong Zhu; Chae, Michael; Bressler, David C.
- Abstract
Although thermal hydrolysis of digested biosolids is an extremely promising strategy for wastewater management, the process economics are prohibitive. Here, a biosolids-based material generated through thermal hydrolysis was used as a catalyst for urea glycerolysis performed under several conditions. The catalytic system showed remarkable activity, reaching conversion values of up to 70.8 ± 0.9% after six hours, at 140 °C using a catalyst/glycerol weight ratio of 9% and an air stream to remove NH3 formed during the process. Temperature played the most substantial role among reaction parameters; increasing temperature from 100 °C to 140 °C improved conversion by 35% and glycidol selectivity by 22%. Furthermore, the catalyst retained good activity even after the fourth catalytic run (conversion rate of 56.4 ± 1.3%) with only a slight decrease in glycidol selectivity. Thus, the use of a biosolids-based catalyst may facilitate conversion of various glycerol sources (i.e., byproduct streams from biodiesel production) into value-added products such as glycidol, and may also improve the economic feasibility of using thermal hydrolysis for treatment of biosolids.
- Subjects
SEWAGE sludge; CATALYSTS; HYDROLYSIS
- Publication
Catalysts (2073-4344), 2018, Vol 8, Issue 9, p373
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal8090373