Processing anaerobic sludge for extended storage as anaerobic digester inoculum
| Autor: | Ruihong Zhang, Jiajia Li, Zongjun Cui, Steven M. Zicari |
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| Rok vydání: | 2014 |
| Předmět: |
Time Factors
Environmental Engineering Vacuum Centrifugation Bioengineering Garbage Methane Specimen Handling Bacteria Anaerobic chemistry.chemical_compound Biogas Bioenergy Desiccation Waste Management and Disposal Water content Sewage Anaerobic sludge Waste management Renewable Energy Sustainability and the Environment Water General Medicine Pulp and paper industry Food waste Volume (thermodynamics) chemistry Anaerobic exercise |
| Zdroj: | Bioresource Technology. 166:201-210 |
| ISSN: | 0960-8524 |
| Popis: | Thermophilic anaerobic sludge was processed to reduce the volume and moisture content in order to reduce costs for storing and transporting the sludge as microbial inoculum for anaerobic digester startup. The moisture content of the sludge was reduced from 98.7% to 82.0% via centrifugation and further to 71.5% via vacuum evaporation. The processed sludge was stored for 2 and 4 months and compared with the fresh sludge for the biogas and methane production using food waste and non-fat dry milk as substrates. It was found that fresh unprocessed sludge had the highest methane yield and the yields of both unprocessed and processed sludges decreased during storage by 1–34%, however processed sludges seemed to regain some activity after 4 months of storage as compared to samples stored for only 2 months. Maximum methane production rates obtained from modified Gompertz model application also increased between the 2-month and 4-month processed samples. |
| Databáze: | OpenAIRE |
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