在Hudson河沉积物中对有氧PCB生物降解的现场刺激
M R Harkness1, J B McDermott, D A Abramowicz
1GE Corporate Research and Development Center, Schenectady, NY 12301.
概括
哈德逊河的土著微生物可以降解多化双 (PCB). 添加营养素,双和氧气促进了沉积物中的这种天然PCB生物降解过程.
科学领域:
- 环境微生物学 环境微生物学
- 生物修复是一种生物修复.
- 有机地化学 有机地化学
背景情况:
- 聚二 (PCB) 是水生沉积物中发现的持久性有机污染物.
- 了解PCB的自然降解对于环境风险评估至关重要.
- 原住民微生物群落在污染物的命运中发挥着关键作用.
研究的目的:
- 为了研究在哈德逊河沉积物中的PCBs在现场有氧生物降解.
- 确定增强或抑制本地微生物降解PCB的因素.
- 评估河流环境中PCB自然减弱的潜力.
主要方法:
- 在哈德逊河沉积物上进行了为期73天的实地研究.
- 通过测量PCB损失和酸产量来监测有氧生物降解.
- 实验包括未经修改的对照,营养添加,二添加和氧气丰富.
- 还测试了用特定的PCB降解细菌进行注射.
主要成果:
- 本地有氧微生物在沉积物中降解了轻度化PCB.
- 在增强条件下,PCB度下降了37%至55%.
- 通过添加无机营养物质,双和氧气,观察到增强的生物降解.
- 基酸盐的生产证实了PCB生物降解中间体.
- 用纯化的PCB降解细菌重复注射并没有改善降解率.
- 生物降解甚至发生在未经改变的条件下.
结论:
- 轻度化PCB可以被哈德逊河的土著有氧微生物生物降解.
- 营养素和氧气的修正可以增强现场PCB生物降解.
- PCB 的自然生物降解可能是河流沉积物的常见过程.
- 这些发现对PCB命运建模和生态风险评估有影响.
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