Fermentation of municipal primary sludge:: Effect of SRT and solids concentration on volatile fatty acid production

被引:32
作者
Bouzas, A
Gabaldón, C
Marzal, P
Penya-Roja, JM
Seco, A
机构
[1] Univ Politecn Valencia, Dept Ingn Hidraul & Med Ambiente, E-46071 Valencia, Spain
[2] Univ Valencia, Dept Ingn Quim, E-46100 Valencia, Spain
关键词
fermentation; primary sludge; solids retention time; volatile fatty acids;
D O I
10.1080/09593332308618359
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Laboratory bench-scale experiments were conducted to investigate the performance of primary sludge fermentation for volatile fatty acids production. Primary sludges from two major wastewater treatment plants located in Valencia (Pinedo and Carraixet) were used. Experiments were performed at solids retention times between 4 and 10 days, and total volatile solids concentrations between 0.6 % and 2.8 %. Operation at two temperatures (20degreesC and 30degreesC) was also checked. Results indicated the importance of feed sludge characteristics on volatile fatty acids yields, being approximately double for the Caaaixet wastewater treatment plant sludge than for the Pinedo plant. In both cases, higher volatile fatty acids yields were observed at higher total volatile solids concentrations. Solids retention times above 6 days scarcely improve volatile fatty acids yields, while experiments conducted at 4 days of solids retention times show an important decrease in volatile fatty acids yields. On raising temperature an increase in volatile fatty acids yields was observed, mainly due to an improvement in the hydrolysis of particulate organic matter.
引用
收藏
页码:863 / 875
页数:13
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