基于化学氧化和堆式热脱附技术修复污染土壤的环境足迹分析

龚先河; 王健; 范例; 宾灯辉; 袁胜; 王明星; 颜渝森

doi:10.12153/j.issn.1674-991X.20240115

基于化学氧化和堆式热脱附技术修复污染土壤的环境足迹分析

doi: 10.12153/j.issn.1674-991X.20240115

龚先河^{1, 2,},
王健^{1, 2},
范例^{1, 2, 3, ,},
宾灯辉^{1, 2, 3},
袁胜^{1, 2},
王明星^{1, 2, 3},
颜渝森^{1, 2}

1.
重庆市生态环境科学研究院
2.
中国环境科学研究院西南分院
3.
重庆市绿色智能环保技术与装备技术创新中心

基金项目: 重庆市技术创新与应用发展专项重点项目（CSTB2023TIAD-KPX0071）；重庆市技术创新与应用示范专项社会民生类重点研发项目（cstc2018jscx-mszdX0064）

详细信息

作者简介:
龚先河（1997—），男，工程师，主要从事污染场地修复技术研究，gongxianhe0820@163.com

通讯作者:
范例（1980—），女，正高级工程师，主要从事土壤和固体废物污染防治研究，fanli1007@foxmail.com

中图分类号: X53
计量
- 文章访问数: 14
- HTML全文浏览量: 3
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2024-02-27
- 录用日期: 2024-07-08
- 修回日期: 2024-06-12

Environmental footprint analysis of remediation of contaminated soil based on chemical oxidation and ex-situ thermal pile desorption technology

GONG Xianhe^{1, 2
,},
WANG Jian^{1, 2},
FAN Li^{1, 2, 3
, ,},
BIN Denghui^{1, 2, 3},
YUAN Sheng^{1, 2},
WANG Mingxing^{1, 2, 3},
YAN Yusen^{1, 2}

1.
Chongqing Academy of Ecology and Environmental Sciences
2.
Southwest Branch of Chinese Research Academy of Environmental Sciences
3.
Chongqing Green Intelligent Environmental Protection Technology and Equipment Technology Innovation Center

摘要

摘要:
在“双碳”背景下，我国土壤修复工程使用技术类型不断向低碳、低能耗和绿色可持续修复技术转变，修复活动本身所产生的环境足迹受到了广泛关注和重视。采用环境足迹评估工具SiteWise^TM对重庆市某钢铁厂汞和多环芳烃污染场地化学氧化和堆式热脱附修复全过程的环境足迹进行了定量评价。结果表明：修复3 483 m³污染土壤，共排放温室气体（GHG）990.52 t，消耗能源1.57×10⁷ MJ，排放空气污染物4.94×10³ kg；GHG排放量、能源消耗量、空气污染物排放量占整个工程的比例在施工准备阶段为6.0%~9.1%，化学氧化阶段为43.6%~48.1%，化学氧化+堆式热脱附阶段为45.9%~47.5%；化学氧化+堆式热脱附技术相比化学氧化技术的环境影响更大，修复单方量污染土壤的GHG排放量、能源消耗量、空气污染物排放量为化学氧化技术的5.28~5.97倍。案例研究结果显示，材料消耗是对环境足迹贡献度最高的环节，其次为设备使用、运输、废物处理。
- 化学氧化 /
- 堆式热脱附 /
- 环境足迹 /
- 温室气体 /
- 能源消耗 /
- 空气污染物
Abstract:
Under the background of "Peak Carbon Dioxide Emissions" and "Carbon Neutrality", the technology type of China's soil remediation projects is continuously shifting towards low-carbon, low-energy, green and sustainable remediation technologies. The environmental footprint of remediation activities has been widely noticed and evaluated. SiteWise^TM, an environmental footprint assessment tool, was used to quantitatively assess the environmental footprint of the whole remediation process of a mercury and PAHs contaminated site in a steel plant in Chongqing. The results showed that the remediation of 3483 m³ of contaminated soil emitted a total of 990.52 t of greenhouse gases (GHGs), consumed 1.57×10⁷ MJ of energy and emitted 4.94×10³ kg of air pollutants. GHG emissions, energy consumption and air pollutant emissions at the construction preparation stage accounted for 6.0%-9.1% of the project, while those at the chemical oxidation stage accounted for 43.6%-48.1%. The GHG emissions, energy consumption and air pollutant emissions at the chemical oxidation + ex-situ thermal pile desorption stage accounted for 45.9%-47.5%. The chemical oxidation + ex-situ thermal pile desorption technology had a greater environmental impact compared to the chemical oxidation technology, and the environmental footprint for remediation of a single cubic volume of contaminated soil was about 5.28-5.97 times that of the chemical oxidation technology. The case study results showed that material consumption was the largest contributor to the environmental footprint, followed by equipment use, transport and residual handling.
- chemical oxidation /
- ex-situ thermal pile desorption /
- environmental footprint /
- greenhouse gas /
- energy consumption /
- air pollutant

HTML全文

图 1 化学氧化+堆式热脱附技术工艺流程

Figure 1. Process flow chart of chemical oxidation + ex-situ thermal pile desorption technology

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图 2 全燃热修复燃烧器功能模块

Figure 2. Functional module of complete combustion thermal remediation burner

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图 3 环境足迹核算系统边界

Figure 3. Environmental footprint accounting boundary

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图 4 工程各阶段GHG排放量和能源消耗量

Figure 4. GHG emissions and energy consumption at each remediation stage

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图 5 工程各阶段空气污染物排放量

Figure 5. Air pollutant emissions at each remediation stage

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图 6 修复工程环境足迹贡献度

Figure 6. Analysis of environmental footprint contribution of remediation project

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表 1 目标污染物浓度及修复目标值

Table 1. Concentrations of target pollutants and remediation target values mg/kg　

污染物类别	污染物浓度	场地修复目标值
汞	ND~8.74	8
萘	ND~237	25
苯并[a]蒽	ND~93.7	5.5
苯并[b]荧蒽	ND~88.2	5.5
苯并[a]芘	0.57~72.7	0.55
茚并[1,2,3-c,d]芘	ND~45.5	5.5
二苯并[a,h]蒽	ND~0.91	0.55
注：ND表示未检出。

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表 2 案例钢铁厂修复工程数据清单

Table 2. Data list of the case steel plant remediation project

类别		Stage Ⅰ	Stage Ⅱ	Stage Ⅲ
类别		Stage Ⅰ	Stage Ⅱ	化学氧化+堆式热脱附	废水废气处理
材料消耗	钢铁/kg	1 600	0	14 062	0
	PVC/kg	840	0	0	0
	HDPE/kg	3 780	0	801	71
	混凝土/t	160	0	400	60
药剂使用	过硫酸钠/t	0	104.5	15	0
	氢氧化钠/t	0	209	29	0
	氧化钙/t	0	51.5	9.5	0
	活性炭/kg	0	0	0	1 000
能源消耗	天然气/kg	0	0	15 042	0
	电/（kW·h）	0	0	149 760	193 440
	柴油/L	24 000	4 230	846	0
运输	人员运输/（人/km）	10/300	0	0	0
运输	货物运输/（t·km）	132 000	1 239	130.4	195
人员工作时间/h	施工人员	240	0	30	25
	工程师	0	250	180	50
	检测人员	0	8	5	5

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表 3 案例工程修复后目标污染物浓度

Table 3. Concentrations of target pollutants after the case project remediation mg/kg　

污染物类别	修复后污染物浓度	修复后二次影响区污染物浓度
汞	0.043~0.05	0.003~0.091
萘	ND	ND
苯并[a]蒽	ND	0.1~0.7
苯并[b]荧蒽	ND	0.4~0.8
苯并[a]芘	ND	0.1~0.5
茚并[1,2,3-c,d]芘	ND	0.3~0.5
二苯并[a,h]蒽	ND	ND
注：ND表示未检出。

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