退役油制气场地原位燃气热脱附应用效果

马迅; 杨超; 翁群强; 刘志阳

doi:10.12153/j.issn.1674-991X.20210656

退役油制气场地原位燃气热脱附应用效果

doi: 10.12153/j.issn.1674-991X.20210656

江苏大地益源环境修复有限公司

基金项目: 国家重点研发计划项目(2019YFC1804004)

详细信息

作者简介:
马迅（1992—），男，硕士，主要从事土壤污染防治研究，907087279@qq.com

中图分类号: X53
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出版历程
- 收稿日期: 2021-11-10

Study on application effect of in-situ gas thermal remediation in decommissioned oil-to-gas production site

Jiangsu DDBS Environmental Remediation Co., Ltd.

摘要

摘要:
燃气热脱附技术是一种适用于有机污染土壤高效热修复的技术。以某退役油制气场地污染土壤原位燃气热脱附项目为例，探讨了土壤修复目标温度，土壤、废水和废气中污染物浓度随原位燃气热脱附修复加热时间的变化。结果表明：加热修复结束时，不同土层的温度都最终达到或接近目标温度；在不同时间段、不同温度下相同或相近修复区域土壤中污染物浓度均处于较低水平，污染物去除率在95.45%以上；废水、废气处理工艺处理效果显著，污染物的去除率为98.5%~99.8%。研究显示，原位燃气热脱附修复技术具备进行大规模实际运用的理论条件。
- 燃气热脱附 /
- 目标温度 /
- 特征污染物 /
- 去除率
Abstract:
Gas thermal remediation technology (GTR) is an efficient technology to clean up organic contaminants from soil. A case study using GTR in a decommissioned oil-to-gas facility site was introduced. The changes of remediation target temperature, and concentrations of contaminants (COC) in soil, waste water and waste gas with the heating time of in-situ GTR were discussed. The results showed that the temperature of different soil layers finally reached or approached the target temperature at the end of thermal remediation. The COC in soil in the same or similar target areas was at a low level at different time periods and temperatures, and the removal rate reached above 96%. The removal rate of contaminants in waste water and waste gas reached 98.5%-99.8% and the above treatment processes were highly effective. The case study had proved that in-situ GTR could be applied on a large scale.
- gas thermal remediation /
- target temperature /
- characteristic pollutants /
- removal rate

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图 1 原位燃气热脱附工艺实施流程

Figure 1. Implementation flow chart of in-situ gas thermal remediation process

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图 2 场地监测点位布置

Figure 2. Layout of site monitoring points

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图 3 冷点位置示意

Figure 3. Cold spot location diagram

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图 4 第一次土壤采样采样点平面布置示意

Figure 4. Schematic diagram of the first soil sampling site layout

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图 5 第二、三次土壤采样采样点平面布置

Figure 5. Layout of the second and third soil sampling points

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图 6 不同深度土壤温度随时间变化曲线

Figure 6. Variation curve of soil temperature with time at different depths

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图 7 废水中污染物浓度随加热时间的变化

Figure 7. Variation of contaminant content in wastewater with heating time

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图 8 废气中污染物检测结果

Figure 8. Test results of pollutants in exhaust gas

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表 1 区域地层水力参数经验值

Table 1. Empirical values of regional formation hydraulic parameters

层序号	岩土	地层富水性	渗透系数/（10⁻⁵ cm/s）
3	砂质黏性土	弱富水	2
4-1	全风化花岗岩	弱富水	30
4-2	强风化花岗岩	弱富水	50

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表 2 目标污染物平均初始浓度

Table 2. Average initial concentration of target pollutants

污染介质	污染物	浓度
土壤/(mg/kg)	苯	79.44
	间/对二甲苯	64.89
	萘	68.02
	苯并(a)蒽	104.68
	苯并(a)芘	94.36
地下水/(mg/L)	苯	4.50
	萘	120.68
	TPH(C10~C16)	256.43
	甲苯	3.60
	苯并(a)蒽	3.98
	苯并(a)芘	1.33
	二苯并（a,h）蒽	0.86

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表 3 第一次土壤采样样品数量统计

Table 3. Statistics of soil samples sampled for the first time

采样点	采样深度/m	数量/个
S1、S4、S8、S11	1、3、5、8	16
S2、S3、S7、S10	1、3、5、8、11	20
S5、S6、S9	1、3、5、8、11、15	18

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表 4 第二、三次土壤采样样品数量统计

Table 4. Second and third statistics of soil samples

第二次采样	第三次采样	采样深度/m	数量/个
S2-1	S3-1	2.5、6.5	4
S2-2	S3-2	2.5、6.5、10.5	6
S2-3	S3-3	2.5、6.5、10.5、14.5	8

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表 5 第一次土壤采样结果

Table 5. Results of the first soil self-test sampling

污染物	S6			S11			S3
污染物	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %
苯并（a）蒽	47.85	ND	100	58.06	0.01	99.00	90.33	1.23	98.63
苯并（a）芘	123.01	1.53	98.76	90.03	2.53	97.19	45.22	0.33	99.27
苯	34.33	0.33	99.04	123.23	3.48	97.18	10.11	0.46	95.45
间/对二甲苯	100.01	3.33	96.67	78.00	0.12	99.84	32.23	0.99	96.93
萘	80.88	0.78	99.04	55.12	1.43	97.41	98.89	0.73	99.26
注：ND表示未检出，下同。

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表 6 第二次土壤采样结果

Table 6. Results of the second soil self-test sampling

污染物	S2-1			S2-2			S2-3
污染物	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %
苯并（a）蒽	56.78	ND	100	63.58	ND	100	103.44	ND	100
苯并（a）芘	99.56	1.53	98.46	88.24	1.53	98.27	28.52	ND	100
苯	40.08	ND	100	119.99	1.48	98.77	11.11	ND	100
间/对二甲苯	100.01	3.02	96.98	88.02	0.12	98.88	38.55	0.99	97.43
萘	76.30	ND	100	59.18	ND	100	98.00	0.03	99.97

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表 7 第三次土壤采样结果

Table 7. Results of the third soil self-test sampling

污染物	S3-1			S3-2			S3-3
污染物	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %	修复前/ (mg/kg)	修复后/ (mg/kg)	去除率/ %
苯并（a）蒽	56.78	ND	100	63.58	ND	100	103.44	ND	100
苯并（a）芘	99.56	0.08	99.92	88.24	2.06	97.68	28.52	ND	100
苯	40.08	ND	100	119.99	1.99	98.34	11.11	ND	100
间/对二甲苯	100.01	2.48	97.52	88.02	ND	100	38.55	1.58	95.90
萘	76.30	ND	100	59.18	ND	100	98.00	0.22	99.78

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