Biodegradability and change of physical characteristics of particles during anaerobic digestion of domestic sewage

被引:74
作者
Elmitwalli, TA
Soellner, J
De Keizer, A
Bruning, H
Zeeman, G
Lettinga, G
机构
[1] Univ Wageningen & Res Ctr, Dept Agr Environm & Syst Technol, Subdept Environm Technol, NL-6700 EV Wageningen, Netherlands
[2] Univ Wageningen & Res Ctr, Dept Biomol Sci, Lab Phys Chem & Colloid Sci, NL-6700 EK Wageningen, Netherlands
关键词
anaerobic treatment; domestic sewage; black water; biodegradability; particle size; surfactants; zeta-potential;
D O I
10.1016/S0043-1354(00)00377-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
At the high-rate anaerobic treatment of domestic sewage, both biological and physical processes play an important role. Therefore, the anaerobic biodegradability of raw, paper-filtered and membrane-filtered sewage and black water has been investigated in batch experiments. Additionally, the effect of anaerobic digestion on physical characteristics, like particle size, surface tension and zetapotential, of the present particles is studied. The biodegradability of domestic sewage and black water at 30 degreesC is almost similar (71-74%). Moreover, a high methanogenesis of the colloidal fraction in domestic sewage (86 +/- 3%) is achieved, showing that the low removal of colloidal particles in continuous high-rate anaerobic reactors is due to low physical removal rather than biodegradability. The lowest biodegradability is demonstrated for the disserved fraction (62%). The results show that after anaerobic digestion the average radius of particles with diameter <4.4 and <0.45 mum increased for domestic sewage, while it decreased for black water. Part of the surface-active components in domestic sewage is not biodegraded during anaerobic batch digestion, as indicated by the development of the surface tension. The negative seta-potential of all particles hardly changes during digestion, showing that colloidal interactions were not affected by anaerobic digestion. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1311 / 1317
页数:7
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