Carbon sources influence the nitrate removal activity, community structure and biofilm architecture

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• 作者：C.S. Srinandan^a ; Glen D&rsquo ; souza^a ; Nidhi Srivastava^b ; Binaya Bhusan Nayak^c ; Anuradha S. Nerurkar^a ; ^{anuner26@yahoo.com}
• 关键词：Biofilm ; Nitrate removal ; Carbon source ; Denitrification
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：August, 2012
• 卷：117
• 期：Complete
• 页码：292-299
• 文件大小：1102 K

摘要

Influence of the frequently used carbon sources in nitrate removal processes were evaluated in a lab-scale biofilm reactor. The NO₃-N removal efficiency was in the order acetate > glucose > methanol > ethanol. Acetate-fed biofilm reduced nearly 100%NO₃-N with negligible amount of NO₂-N accumulation. Although 99%NO₃-N was reduced in the glucose-fed biofilm, substantial NH₃-N and NO₂-N accumulated. Methanol-fed biofilm reduced 72%of NO₃-N with accumulation of 2.2 mg L^鈭? of NO₂-N, while biofilm formed in presence of ethanol showed 61%reduction in NO₃-N although relatively higher ratio of denitrifiers were observed. Acetate and ethanol-fed biofilm displayed characteristic biofilm architecture with voids, but the former had relatively higher thickness and diffusion distance. In presence of glucose and methanol, a confluent biofilm without characteristic voids was formed. Pseudomonas sp. numerically dominated the acetate and ethanol-fed biofilm, while Enterobacter sp. and Methylobacillus sp., were abundant in glucose and methanol biofilms respectively.