Design of stirred digester with optimization of energy and power consumption
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- 作者：Mahmood Mahmoodi-Eshkaftaki ; Rahim Ebrahimi and Abdollah Ghasemi-Pirbaloti
- 刊名：Environmental Progress & Sustainable Energy
- 出版年：2017
- 出版时间：January, 2017
- 年：2017
- 卷：36
- 期：1
- 页码：104-110
- 全文大小：193K
- ISSN：1944-7450
文摘
The goal of the present study was to design a new stirred digester according to laboratory experiments. For this purpose, amount of methane produced from co-digestion of municipal waste, kitchen waste, and cow manure in different treatments was measured in laboratory conditions for 37°C. The substrate characteristics such as both total and volatile solids, pH, EC, amount of total carbon, nitrogen, phosphorus, potassium, and sulfate which can manage the methane production were measured. The results showed that the amounts of these characteristics were in suitable ranges for biogas production. The laboratory experiment results were then used to design an anaerobic digester for single-family homes based on energy efficiency and mixing cost. As a result, the digester diameter, digester height, slurry height, baffle width, impeller diameter, blade width, blade length, and volume of designed stirred digester were determined as 57, 90, 60, 4.75, 25, 4, 10 cm, and 229 L, respectively. Furthermore, pitched blade turbine with six blades at 45° for speed of 300 rpm not only required a low power but also produced a high torque. Therefore, while the designed biogas plant consumes low energy, it has high mixing cost.