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首页> 外文会议>European Symposium on Environmental Biotechnology(ESEB 2004); 20040425-20040428; Oostende; BE >Bioprotection of the structure and function of activated sludge microbial communities against chloroaniline shock loads
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Bioprotection of the structure and function of activated sludge microbial communities against chloroaniline shock loads

机译：活性污泥微生物群落的结构和功能对氯苯胺冲击负荷的生物保护

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Bioaugmentation of bioreactors generally focuses on the removal of specific xenobiotics. Often, less attention is hereby paid to the recovery of other reactor functions such as ammonium-nitrogen removal. This work evaluated the effects on activated sludge reactor functions of a 3-chloroaniline (3-CA) pulse and the protective bioaugmentation by inoculation with the 3-CA degrading strain Comamonas testosteroni I2gfp. Changes in functions such as nitrification, removal and sludge compaction were monitored with the sludge community structure, in particular the nitrifying populations. Molecular techniques characterized and enumerated the ammonia oxidizing microbial community immediately after a 3-CA shock load. Two days after the 3-CA shock, ammonium accumulated and the nitrification activity did not recover over a 12-day period in the non-bioaugmented reactors. In contrast, nitrification in the bioaugmented reactor started to recover from day 4 on. The molecular analysis showed that the ammonia oxidizing microbial community of the bioaugmented reactor recovered both in structure, activity and abundance, while in the non-bioaugmented reactor the number of ribosomes of the ammonia oxidizers decreased drastically and the community composition changed and did not recover. This study demonstrates that bioaugmentation of wastewater reactors to accelerate the degradation of toxic chlorinated organics such as 3-chloroaniline protected the nitrifying bacterial community, thereby allowing faster recovery from toxic shocks.
机译：生物反应器的生物强化通常集中在特定异源生物的去除上。因此，通常很少注意其他反应器功能的恢复，例如铵氮的去除。这项工作评估了接种3-CA降解菌株Comamonas testosteroni I2gfp对3-氯苯胺（3-CA）脉冲对活性污泥反应器功能的影响以及保护性生物增强作用。通过污泥群落结构，尤其是硝化种群，监测硝化，去除和污泥压实等功能的变化。分子技术在3-CA冲击负荷后立即表征并枚举了氨氧化微生物群落。 3-CA震荡后两天，在非生物强化反应器中，氨累积且硝化活性在12天内没有恢复。相反，从第4天开始，生物强化反应器中的硝化作用开始恢复。分子分析表明，生物强化反应器的氨氧化微生物群落在结构，活性和丰度上均得到恢复，而在非生物强化反应器中，氨氧化剂的核糖体数量急剧减少，群落组成改变并且没有恢复。这项研究表明，废水反应器的生物增强可加速有毒氯化有机物（如3-氯苯胺）的降解，从而保护硝化细菌群落，从而使有毒休克更快地恢复。

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