Impact of temperature on drinking water biofilter performance and microbial community structure

被引:77
作者
Moll, DM [1 ]
Summers, RS [1 ]
Fonseca, AC [1 ]
Matheis, W [1 ]
机构
[1] Univ Cincinnati, Dept Civil & Environm Engn, Cincinnati, OH 45221 USA
关键词
D O I
10.1021/es9900757
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Seasonal changes in removal of natural organic matter (NOM) by drinking water biofilters are often attributed to temperature differences. Bench-scale sand biofilters treating NOM isolated from a surface water source were operated in parallel at 5, 20, and 35 degrees C to isolate the effect of temperature from other water quality and operational parameters, which also vary seasonally. The biofilter operated at 5 degrees C achieved significantly lower removal of NOM and the NOM fraction that reacts with disinfectants (disinfection byproduct precursors) compared to the filters operated at 20 and 35 degrees C, which had similar performance levels. Viable biomass, measured as lipid phosphate, was significantly higher at the top and bottom of the! filter operated at 20 degrees C. Phospholipid fatty acid (PLFA) profiles indicated an increasing gradient in markers for Gram-negative bacteria and microeukaryotes as biofilter operation temperature decreased, replacing general fatty acids and markers for Gram-positive bacteria and sulfate-reducing bacteria, which were observed in greatest abundance in the filter operated at 35 degrees C. Principal components analysis differentiated the microbial PLFA profiles based an biofilter operation temperature and filter depth. These results were corroborated by identifications of the dominant microbial colonies isolated on R2A agar.
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收藏
页码:2377 / 2382
页数:6
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