ANAEROBIC DEGRADATION OF BUTYRATE IN A UASB REACTOR

被引:22
作者
FANG, HHP
CHUI, HK
LI, YY
机构
[1] Environmental Engineering Research Centre, Department of Civil and Structural Engineering, The University of Hong Kong, Hong Kong, Pokfulam Road
关键词
BUTYRATE; DEGRADATION; GRANULE; METHANOGENIC ACTIVITY; METHANOTHRIX; SYNTROPHIC ASSOCIATION;
D O I
10.1016/0960-8524(94)00092-F
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Wastewater with concentrated butyrate was treated in a 2.8 l UASB (Upflow Anaerobic Sludge Blanket) reactor at 37-degrees-C and pH 7.1-7.7. The process consistently removed 97-99% of COD for loading rates up to 31 g COD/l/day. Of all the COD removed, 94.5% was converted to methane; the average sludge yield was 0.037 g VSS/g COD. Conversion of acetate to methane appeared to be the rate-limiting step. Sludge granules had a maximum specific methane production rate of 1.57 g methane COD/g VSS/day, but were unable to degrade propionate. The granules were 1-2 mm in size and had a densely-packed skin layer which comprised two types of microcolony: one was composed of cocci with abundant extracellular polymer and the other was composed of two bacterial species in juxtapositioned syntrophic association. The interior was mainly composed of Methanotrix-like bacteria, a large number of which were entwined into rope-shaped aggregates.
引用
收藏
页码:75 / 81
页数:7
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