Optimisation of sewage sludge anaerobic digestion through co-digestion with OFMSW: Effect of collection system and particle size

被引:59
|
作者
Silvestre, Gracia [1 ,2 ]
Bonmati, August [1 ]
Fernandez, Belen [1 ]
机构
[1] IRTA, GIRO Joint Res Unit IRTA UPC, Barcelona, Spain
[2] Ainia, Dept Medio Ambiente Bioenergia & Higiene Ind, Valencia, Spain
关键词
Anaerobic digestion; Sewage sludge; Co-digestion; OFMSW; Particle size; MUNICIPAL SOLID-WASTE; ACTIVATED-SLUDGE; FOOD WASTE; CODIGESTION; BIOGAS; PLANTS; FRUIT;
D O I
10.1016/j.wasman.2015.06.029
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The effect of organic fraction of municipal solid waste (OFMSW) loading rate and particulate size on the sewage sludge (SS) mesophilic anaerobic co-digestion was assessed in continuous stirred tank reactor at hydraulic retention time of 20 days. The SS-OFMSW mixture composed by 54% of the volatile solids fed (inlet-VS), at OLR of 3.1 kg(COD) m(-3) d(-1) (1.9 kg(VS) m(-3) d(-1)), showed the highest increment on the volumetric methane production and yield of +200% and +59% respectively, under stable conditions. The effect of particulate size was assessed with the same mixture and same operational conditions but reducing the OFMSW particulate size from 20 mm to 8 mm with the aim to improve the hydrolysis step, but the results showed any influence in the OFMSW particulate size range analysed. In addition, specific biomass activity was assessed at the end of each co-digestion period. Results showed that OFMSW promoted (beta-oxidation syntrophic acetogens and the acetoclastic methanogens activity; although the last increase of the OFMSW percentage (from 47% to 54% inlet-VS) affected negatively the specific substrate activity, but not inhibitory effect was observed. Therefore, the results obtained in the continuous experiment could be related with some inhibitory or toxic effect and not due to hydrolysis limitation. The specific biomass activity test was demonstrated to be an interesting tool to evaluate and control the co-digestion process, especially when conventional parameters did not explain the behaviour of the biological system. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:137 / 143
页数:7
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