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Assessment of potential anaerobic biotransformation of organic pollutants in sediment caps

机译：沉积物盖中有机污染物潜在厌氧生物转化的评估

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In situ capping is a remedial approach for reducing the risk of biota exposure to sediment contaminants. Biotransformation of contaminants in sand-based sediment caps, rarely considered in sediment cap design, could further reduce the exposure risk. The anaerobic biotransformation of benzene, toluene, ethylbenzene, xylenes(BTEX), monochlorobenzene, dichlorobenzenes and naphthalene was evaluated with sediments from Onondaga Lake in dilute sediment slurries and in sand-capped sediment laboratory-scale columns. The percentage of sediment samples demonstrating biotransformation under anaerobic conditions in slurries incubated at 12°C was greatest for BTEX, followed by monochlorobenzene, 1,4-dichlorobenzene, 1,2-dichlorobenzene and 1,3-dichlorobenzene. Only toluene biotransformation was observed in sand cap columns. The rate of toluene biotransformation diminished over time, which might be due to inhibition caused by hydrogen from the experimental setup. Results suggest potential for the biotransformation of toluene, and possibly other pollutants, in sand-based sediment caps under anaerobic conditions at low temperatures.
机译：原位封盖是用于减少生物群暴露于沉积物污染物的风险的补救方法。沙基沉积物盖中污染物的生物转化（在沉积物盖设计中很少考虑）可以进一步降低暴露风险。用来自Onondaga湖的稀沉积泥浆和砂质沉积物实验室规模柱中的沉积物评估了苯，甲苯，乙苯，二甲苯（BTEX），一氯苯，二氯苯和萘的厌氧生物转化。对于BTEX，在厌氧条件下于12°C孵育的浆液中表现出生物转化的沉积物样品百分比最高，其次是一氯苯，1,4-二氯苯，1,2-二氯苯和1,3-二氯苯。在沙帽柱中仅观察到甲苯的生物转化。甲苯生物转化率随时间而降低，这可能是由于实验装置中氢气引起的抑制作用所致。结果表明，在厌氧条件下，在低温条件下，沙基沉积物盖中甲苯和可能的其他污染物可能发生生物转化。

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