Anaerobic slurry co-digestion of poultry manure and straw: effect of organic loading and temperature

Journal of Environmental Health Science Engineering

Anis Roshani²  Jalal Shayegan¹  Azadeh Babaee¹ 

[1] University of Sharif, Tehran, Iran;Azad University of Tehran, Tehran, Iran

关键词: Yield;    Biogas;    Wheat straw;    Poultry manure;    Anaerobic digestion;   

Others  :  820626
DOI  :  10.1186/2052-336X-11-15

 received in 2013-05-07, accepted in 2013-05-29,  发布年份 2013

【 摘 要 】

In order to obtain basic design criteria for anaerobic digestion of a mixture of poultry manure and wheat straw, the effects of different temperatures and organic loading rates on the biogas yield and methane contents were evaluated. Since poultry manure is a poor substrate, in term of the availability of the nutrients, external supplementation of carbon has to be regularly performed, in order to achieve a stable and efficient process. The complete-mix, pilot-scale digester with working volume of 70 L was used. The digestion operated at 25°C, 30°C and 35°C with organic loading rates of 1.0, 2.0, 2.5, 3.0, 3.5 and 4.0 kg Volatile solid/m³d and a HRT of 15 days. At a temperature of 35°C, the methane yield was increased by 43% compared to 25°C. Anaerobic co-digestion appeared feasible with a loading rate of 3.0 kg VS/m³d at 35°C. At this state, the specific methane yield was calculated about 0.12 m³/kg VS with a methane content of 53–70.2% in the biogas. The volatile solid (VS) removal was 72%. As a result of volatile fatty acid accumulation and decrease in pH, when the loading rate was less than 1 or greater than 4 kg VS/m³d, the process was inhibited or overloaded, respectively. Both the lower and higher loading rates resulted in a decline in the methane yield.

【 授权许可】

   
2013 Babaee et al.; licensee BioMed Central Ltd.

【 图 表 】

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