Co-digestion of sewage sludge with crude or pretreated glycerol to increase biogas production
| Autor: | Magali Christe Cammarota, Isaac Volschan, Janaína dos Santos Ferreira |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Glycerol
Salinity Methanogenesis 020209 energy Health Toxicology and Mutagenesis Sewage 02 engineering and technology 010501 environmental sciences 01 natural sciences Methane chemistry.chemical_compound Bioreactors Waste Management Biogas 0202 electrical engineering electronic engineering information engineering Bioreactor Environmental Chemistry Anaerobiosis Food science 0105 earth and related environmental sciences Biodiesel business.industry General Medicine Pollution chemistry Biofuels business Sludge |
| Zdroj: | Environmental Science and Pollution Research. 25:21811-21821 |
| ISSN: | 1614-7499 0944-1344 |
| Popis: | Anaerobic co-digestion of sewage sludge and glycerol from the biodiesel industry was evaluated in three experimental stages. In the first step, the addition of higher proportions of crude glycerol (5-20% v/v) to the sludge was evaluated, and the results showed a marked decrease in pH and inhibition of methane production. In the second step, co-digestion of sludge with either a lower proportion (1% v/v) of crude glycerol or glycerol pretreated to remove salinity resulted in volatile acid accumulation and low methane production. The accumulation of volatile acids due to the rapid degradation of glycerol in the mixture was more detrimental to methanogenesis than the salinity of the crude glycerol. In the third step, much lower amounts of crude glycerol were added to the sludge (0.3, 0.5, 0.7% v/v), resulting in buffering of the reaction medium and higher methane production than in the control (pure sludge). The best condition for co-digestion was with the addition of 0.5% (v/v) crude glycerol to the sewage sludge, which equals 0.6 g glycerol/g volatile solids applied. Under this condition, the specific methane production (mL CH4/g volatile solids applied) was 1.7 times higher than in the control. |
| Databáze: | OpenAIRE |
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