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学科主题: 环境科学与工程::环境科学
题名: Nitrifying bacterial growth inhibition in the presence of algae and cyanobacteria
作者: okkyoung Choi ; Atreyee Das ; Chang-ping Yu ; Zhiqiang Hu
通讯作者: Zhiqiang Hu
刊名: Biotechnology and Bioengineering
发表日期: 2010
卷: 107, 期:6, 页:1004-1011
收录类别: SCI
英文摘要: Nitrifying bacteria, cyanobacteria, and algae
are important microorganisms in open pond wastewater
treatment systems. Nitri?cation involving the sequential
oxidation of ammonia to nitrite and nitrate, mainly due
to autotrophic nitrifying bacteria, is essential to biological
nitrogen removal in wastewater and global nitrogen cycling.
A continuous ?ow autotrophic bioreactor was initially
designed for nitrifying bacterial growth only. In the presence
of cyanobacteria and algae, wemonitored both themicrobial
activity by measuring speci?c oxygen production rate
(SOPR) for microalgae and cyanobacteria and speci?c oxy-
gen uptake rate (SOUR) for nitrifying bacteria. The growth
of cyanobacteria and algae inhibited the maximum nitri?ca-
tion rate by a factor of 4 although the ammonium nitrogen
fed to the reactor was almost completely removed. Terminal
restriction fragment length polymorphism (T-RFLP) ana-
lysis indicated that the community structures of nitrifying
bacteria remained unchanged, containing the dominant
Nitrosospira, Nitrospira, and Nitrobacter species. PCR ampli-
?cation coupled with cloning and sequencing analysis
resulted in identifying Chlorella emersonii and an uncultured
cyanobacterium as the dominant species in the autotrophic
bioreactor. Notwithstanding their fast growth rate and their
toxicity to nitri?ers, microalgae and cyanobacteria were
more easily lost in ef?uent than nitrifying bacteria because
of their poor settling characteristics. The microorganisms
were able to grow together in the bioreactor with constant
individual biomass fractions because of the uncoupled solids
retention times for algae/cyanobacteria and nitri?ers. The
results indicate that compared to conventional wastewater
treatment systems, longer solids retention times (e.g., by a
factor of 4) should be considered in phototrophic bioreac-
tors for complete nitri?cation and nitrogen removal
语种: 英语
内容类型: 期刊论文
URI标识: http://124.16.167.195/handle/335003/994
Appears in Collections:环境生物技术研究组_期刊论文

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Recommended Citation:
okkyoung Choi.Nitrifying bacterial growth inhibition in the presence of algae and cyanobacteria.Biotechnology and Bioengineering,2010,107(6):1004-1011
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