Dry co-digestion of sewage sludge and rice straw under mesophilic and thermophilic anaerobic conditions
| Autor: | Guangxue Wu, Jiaquan Wang, Xiangqian Chu, Zhenhu Hu |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Nitrogen
Health Toxicology and Mutagenesis Sewage Bioreactors Biogas Bioenergy Environmental Chemistry Anaerobiosis Chemistry business.industry Temperature food and beverages Oryza General Medicine Straw Hydrogen-Ion Concentration Plant Components Aerial Pulp and paper industry Pollution Carbon Anaerobic digestion Agronomy Biofuel Biofuels business Sludge Mesophile |
| Zdroj: | Environmental science and pollution research international. 22(24) |
| ISSN: | 1614-7499 |
| Popis: | Dry anaerobic digestion of sewage sludge can recover biogas as energy; however, its low C/N ratio limits it as a single substrate in the anaerobic digestion. Rice straw is an abundant agricultural residue in China, which is rich in carbon and can be used as carbon source. In the present study, the performance of dry co-digestion of sewage sludge and rice straw was investigated under mesophilic (35 °C) and thermophilic (55 °C) conditions. The operational factors impacting dry co-digestion of sewage sludge and rice straw such as C/N ratio, moisture content, and initial pH were explored under mesophilic conditions. The results show that low C/N ratios resulted in a higher biogas production rate, but a lower specific biogas yield; low moisture content of 65 % resulted in the instability of the digestion system and a low specific biogas yield. Initial pH ranging 7.0-9.0 did not affect the performance of the anaerobic digestion. The C/N ratio of 26-29:1, moisture content of 70-80 %, and pH 7.0-9.0 resulted in good performance in the dry mesophilic co-digestion of sewage sludge and rice straw. As compared with mesophilic digestion, thermophilic co-digestion of sewage sludge and rice straw significantly enhanced the degradation efficiency of the substrates and the specific biogas yield (p |
| Databáze: | OpenAIRE |
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