Determining Criterions for Natural Biodegradation of Chlorinated Hydrocarbons in Shallow Groundwater
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摘要: 天然条件下氯代烃生物降解的判别, 是确定氯代烃污染天然衰减恢复治理技术是否可以采用的关键, 可为天然衰减恢复治理技术的应用提供技术支持.通过分析氯代烃生物降解的特性发现, 地下水环境中氯代烃的生物降解, 必然伴随有第一基质、电子受体、中间产物以及有关的一些间接性指标, 在污染羽状体不同位置及污染羽状体内外产生明显变化, 这些指标的变化均可以不同程度地指示氯代烃生物降解的产生.据此总结出氯代烃生物降解衰减的判别依据分别为电子受体、第一基质(能源和碳源) 及降解中间产物三类指标.Abstract: Natural biodegradation is one of the important processes resulting in the decrease of chlorinated pollutants in environments. Identification of the occurrence of natural biodegradation is thus the key issue to evaluate the practicability of the natural attenuation of these compounds. Through the analysis of the characteristics of biodegradation, we found that, the biodegradation of chlorinated compounds in groundwater environments always leads to the visible change of electron acceptors, primary substances, intermediate products, and other indirect indexes. The spatial variation of these substances around the different locations of the polluted plumes is proposed to be a consequence of biodegradation of chlorinated compounds. On this basis, this paper summarized the determining criterions for the evaluation of biodegradation of chlorinated hydrocarbons in groundwater under natural conditions, including electron acceptors, primary substances and intermediate products.
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Key words:
- chlorinated solvent /
- natural attenuation /
- biodegradation /
- determining criterion
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图 1 污染地下水中电子受体分带示意图
Fig. 1. Zonation of electron acceptors in contaminated groundwater
图 2 厌氧条件下氯代烃的生物降解模式
a.氯代烃及其降解中间产物的浓度变化; b.地下水电子受体浓度变化曲线
Fig. 2. Common patterns of chlorinated solvent biodegradation in an anaerobic system
图 3 厌氧/好氧条件下氯代烃的生物降解模式
a.氯代烃及其降解中间产物的浓度变化; b.地下水电子受体浓度变化曲线
Fig. 3. Common patterns of chlorinated solvent biodegradation in a sequential aerobic/anaerobic system
表 1 几种常见氯代烃在好氧和厌氧条件下降解转化的统计结果
Table 1. Degradation of common chlorinated solvents under aerobic and anaerobic conditions
表 2 天然条件下地下水中氯代烃微生物降解判定的分析指标及评分
Table 2. Analytical parameters and weightings for estimating biodegradation of chlorinated solvents in groundwater under natural conditions
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