Effects of thermal and thermal-alkaline pretreatments on continuous anaerobic sludge digestion: Performance, energy balance and, enhancement mechanism
| Autor: | Hao Yi, Benyi Xiao, Hong Chen, Xuesong Guo, Hechao Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
060102 archaeology Renewable Energy Sustainability and the Environment Chemistry Methanogenesis 020209 energy 06 humanities and the arts 02 engineering and technology Pulp and paper industry Methane Anaerobic digestion chemistry.chemical_compound Hydrolysis Biogas 0202 electrical engineering electronic engineering information engineering 0601 history and archaeology Organic matter Sludge Mesophile |
| Zdroj: | Renewable Energy. 147:2409-2416 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2019.10.051 |
| Popis: | The effects of thermal pretreatment (TP) and thermal-alkaline pretreatment (TAP) on a continuous mesophilic anaerobic digestion (AD) of sewage sludge were investigated. Both TP (134 ± 1 °C and 30 min) and TAP (pH 12, 134 ± 1 °C and 30 min) released, hydrolyzed, and mineralized the organic matter of sludge, but TAP provided superior results. The methane yields of thermal pretreated sludge (TPS) and thermal-alkaline pretreated sludge (TAPS) were 1.88 times and 2.20 times that of raw sludge (RS), respectively. Moreover, the average methane content of biogas produced from TAPS (73.4 ± 3.4%) was higher than that from TPS (69.1 ± 3.1%) and from RS (67.2 ± 2.9%). The energy balance of the total process with TAP was the highest (4.326 kJ/g VS) and that of the RS AD was the lowest (2.045 kJ/g VS). Both pretreatments enhanced the sludge hydrolysis with TAP presenting higher efficiency, and shifted the rate-limiting step of the anaerobic sludge digestion from hydrolysis to methanogenesis. |
| Databáze: | OpenAIRE |
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