Potential for thermophilic (50 degrees C) anaerobic dechlorination of pentachlorophenol in different ecosystems
Potential for thermophilic (50 degrees C) anaerobic dechlorination of pentachlorophenol in different ecosystems
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DOI：
10.1128/aem.57.7.2085-2090.1991
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发表时间：
1991-07
影响因子：
4.4
通讯作者：
S. Larsen;H. V. Hendriksen;B. Ahring
中科院分区：
文献类型：
--
作者：
S. Larsen;H. V. Hendriksen;B. Ahring
采用自然生态系统和厌氧消化池中的不同接种物，研究了五氯酚（PCP）的高温（50 ℃）厌氧生物降解。测试的接种物是三个淡水沉积物，四个厌氧污水污泥样品从消化池处理污泥从废水处理厂与各种工业投入，消化粪肥从厌氧反应器。只有一个消化污泥样品和粪肥样品来自嗜热环境。五氯苯酚的初始浓度为7.5或37.5微摩尔。8个月后，沉积物样本中的五氯苯酚消失，出现了各种氯化程度较低的中间体。额外添加的五氯苯酚在4周内降解，对于淡水沉积物，在添加7.5 μ M五氯苯酚的小瓶中测得的最大脱氯速率为1.61 μ mol/L/天，在添加37.5 μ M五氯苯酚的小瓶中测得的最大脱氯速率为7.50 μ mol/L/天。相比之下，经过8个月的培养后，最初加入的五氯苯酚只有2.8%至17.5%从污泥样品中消失。形成的中间体的复杂模式表明，五氯苯酚的脱氯是通过不同的途径进行的，在脱氯过程中至少涉及两种不同的种群。
Thermophilic (50 degrees C) anaerobic biodegradation of pentachlorophenol (PCP) was investigated by using different inocula from natural ecosystems and anaerobic digesters. The inocula tested were three freshwater sediments, four anaerobic sewage sludge samples from digesters treating sludge from wastewater plants with various industrial inputs, and digested manure from an anaerobic reactor. Only one digested-sludge sample and the manure sample were from thermophilic environments. The initial PCP concentration was 7.5 or 37.5 microM. After 8 months, PCP had disappeared from the sediment samples and various, less chlorinated intermediates were present. Additions of extra PCP were degraded within 4 weeks, and a maximal observed dechlorination rate of 1.61 mumol/liter/day in the vials with addition of 7.5 microM PCP and 7.50 mumol/liter/day in the vials with addition of 37.5 microM PCP were measured for a freshwater sediment. In contrast, only 2.8 to 17.5% of the initial PCP added had disappeared from the sludge samples after 8 months of incubation. The complex pattern of intermediates formed indicated that the dechlorination of PCP proceeded via different pathways, involving at least two different populations in the dechlorination processes.