Co-Fermentation of Municipal Waste Streams: Effect of Pretreatment Methods on Volatile Fatty Acids Production
| Autor: | Srija Balachandran, Zeynep Cetecioglu, Elzbieta Plaza, Isaac Owusu-Agyeman |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Co-fermentation Chromatography Municipal solid waste genetic structures Renewable Energy Sustainability and the Environment 020209 energy Forestry 02 engineering and technology Biodegradable waste Pretreatment method Caproic Acid Acetic acid chemistry.chemical_compound Enzyme chemistry Yield (chemistry) 0202 electrical engineering electronic engineering information engineering Composition (visual arts) Food science Waste Management and Disposal Agronomy and Crop Science |
| Zdroj: | SSRN Electronic Journal. |
| ISSN: | 1556-5068 |
| DOI: | 10.2139/ssrn.3706645 |
| Popis: | The effect of direct enzyme addition and other pretreatment methods on VFA production through co-fermentation of primary sludge and external organic waste was studied under initial alkaline (pH 10) and acidic (pH 5) conditions. Beside the direct enzyme cocktail addition, 24-hour enzymatic, ultrasonic, ultrasonic + 24-hour enzymatic and thermal were the other pretreatment methods. Under the alkaline condition, direct addition of enzyme enhanced VFA production by 29-39% throughout the experimental period, whereas there was 37-43% increase in VFA production under the acidic condition only at retention days 1 and 2. VFA composition was dominated by acetic acid (54-67%) and propionic acid (31-46%) under alkaline and acidic condition, respectively. Direct enzyme addition resulted in the increment in the percentage of caproic acid from 8-9% to 16-17%, under the acidic condition. While 24-hour enzymatic pretreatment didn’t show any improvement on VFA production, thermal, ultrasonic + 24-hour enzymatic and ultrasonic pretreatment methods increased VFA production by 18, 14 and 4%, respectively. On the other hand, the pretreatment methods significantly increased biogas production. Experiment without pretreatment achieved maximum biogas production of 392 NmL CH 4 at day 9 while experiments with pretreatments achieved maximum of 679-954 NmL CH 4 in the order of no pretreatment < ultrasonic < thermal < 24-hour enzymatic < ultrasonic + 24-hour enzymatic. The study gives insight into how pretreatment strategy can influence VFA production and composition. |
| Databáze: | OpenAIRE |
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