Comparative effect of different aerobic pretreatments on the kinetics and macroenergetic parameters of anaerobic digestion of olive mill wastewater in continuous mode

被引:48
作者
Borja, R
Alba, J
Mancha, A
Martin, A
Alonso, V
Sanchez, E
机构
[1] CSIC, Inst Grasa, Seville 41012, Spain
[2] Univ Cordoba, Fac Ciencias, Dept Ingn Quim, E-14004 Cordoba, Spain
[3] Ctr Nacl Invest Cient, Div Estudios Contraminac Ambiental, Havana, Cuba
关键词
D O I
10.1007/s004490050422
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
A comparative kinetic study was carried out on the anaerobic digestion of olive mill wastewater (OMW) and OMW that was previously fermented with Geotrichum candidum, Azotobacter chroococcum and Aspergillus terreus. The reactors used were continuously fed and contained sepiolite as support for the mediating bacteria. A kinetic model for multicomponent substrate removal by anaerobic digestion has been used. The model is based on the linear removal concept which is a special case of the broader Monod equation. The second-order kinetic constant, k(2)(s), was found to be influenced by the pretreatment carried out, and was 4.2, 4.0 and 2.5 times higher for Aspergillus, Azotobacter and Geotrichum-pretreated OMWs than that obtained in the anaerobic digestion of untreated OMW. This was significant at 95% confidence level. This behaviour is believed to be due to the lower levels of phenolic compounds and biotoxicity present in the pretreated OMWs. In fact, the kinetic constant increased when the phenolic compound content and biotoxicity of the pretreated OMWs decreased. In addition, the macro-energetic parameters of the anaerobic digestion of OMW, i.e. the specific rate of substrate uptake for cell maintenance, m, and the yield coefficient for the biomass, Y, decreased by a factor of 2.4, 3.6 and 5.1 and increased by a factor of 1.9, 2.2 and 2.4 respectively, for the OMWs previously treated with Geotrichum candidum, Azotobacter chroococcum and Aspergillus terreus in relation to the observed values for the untreated OMW.
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页码:127 / 134
页数:8
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