基于碳排放的石化场地气相自然衰减定量研究

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摘要使用动态通量箱法测量CO₂通量，对某石化场地污染源区的轻非水相液体（LNAPL）自然衰减速率进行了定量测定.结果显示，在污染区10万m²的面积内，石油烃生物降解产生的CO₂空间平均通量为0.59μmol/（m²·s），对应的LNAPL自然衰减速率为31.1t石油烃/a，测量值在其他场地报道的自然衰减速率范围内.这一结果表明污染源区存在活跃的石油烃自然衰减过程.LNAPL自然衰减速率受温度和气压的影响，因此如需获得更精准的年平均自然衰减速率，需要进行季节性测量.本场地一年自然衰减的碳排放量为85t，达到了某农药厂风险管控5a碳排放量的19%，由自然衰减造成的碳排放量应加入到污染场地全生命周期的碳排放核算中.本研究结果可为自然衰减速率评估以及碳排放核算提供参考.

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	关俊杰
	熊峰
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	马志远
	黄杰锐
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	李正芳
	林梦源
	包育文
	闫京瑞
	费文博
	马杰

关键词 ：污染场地, 轻非水相液体, 石油, 自然衰减速率, 二氧化碳通量

Abstract：In this study, the CO₂ efflux at the ground surface was measured using a dynamic closed chamber method to evaluate the NSZD rate in light non-aqueous phase liquid (LNAPL) source zone at a large petrochemical site. The results show that the average CO₂ efflux associated with contaminant degradation was estimated at 0.59μmol/(m²×s), corresponding to a total petroleum hydrocarbon mineralization rate of 31.1t TPH/year in the study area of 100,000m², falling within the range of NSZD rates reported at other sites. The result showed that there was active NSZD of petroleum hydrocarbon in source zone. NSZD rates were affected by temperature and atmospheric pressure. Therefore, to provide a more accurate estimate of the average NSZD rate and to evaluate long-term trends, seasonal measurements are required. The annual carbon emissions of NSZD were estimated at 85t at this site, accounting for 19% of the carbon emissions under risk control site. Obviously, the carbon emissions caused by NSZD should be included in the carbon emissions accounting of a contaminated site, which will provide valuable insights into NSZD rate assessment and calculation of carbon emissions.

Key words： contaminated site light non-aqueous phase liquid petroleum natural source zone depletion rate CO₂ efflux

收稿日期: 2023-06-25

PACS:

X511

基金资助:国家自然科学基金资助项目（21878332，42177042）；中国石油大学（北京）科研基金专项资金资助项目（2462022QNXZ006，2462022YXZZ011）

通讯作者: 马杰,教授,rubpmj@sina.com E-mail: rubpmj@sina.com

作者简介: 关俊杰(1996-),男,河南郑州人,中国石油大学(北京)博士研究生,研究方向:石油烃气相自然衰减.发表论文4篇.guan.junjie@foxmail.com.

引用本文:

关俊杰, 熊峰, 蒋雨, 乔建平, 马志远, 黄杰锐, 万雨若, 李正芳, 林梦源, 包育文, 闫京瑞, 费文博, 马杰. 基于碳排放的石化场地气相自然衰减定量研究[J]. 中国环境科学, 2024, 44(2): 1064-1070. GUAN Jun-jie, XIONG Feng, JIANG Yu, QIAO Jian-ping, MA Zhi-yuan, HUANG Jie-rui, WAN Yu-ruo, LI Zheng-fang, LIN Meng-yuan, BAO Yu-wen, YAN Jing-rui, FEI Wen-bo, MA Jie. CO₂ efflux-based quantification of natural zone depletion rate of LNAPL gas phase at a large petrochemical site. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 1064-1070.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I2/1064

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