Short-process treatment technology for ex-situ remediation of groundwater in oil-contaminated sites

doi:10.16085/j.issn.1000-6613.2025-0266

Abstract

Abstract:

The composition of groundwater pollutants in petroleum-contaminated sites is complex, exhibiting high toxicity and significant fluctuations in water quality and quantity. These sites are characterized by oil and turbidity, as well as high salinity and organic load, making implementing an extraction-treatment model for the ex-situ remediation of contaminated groundwater advisable. This study employed an oil-resistant, pollution-resistant membrane filtration technology in conjunction with catalytic ozonation to remediate contaminated groundwater. When the operating pressures of the UF membrane and NF membrane were 0.2MPa and 0.7MPa, respectively, with ozone dosage and catalyst dosage at 50mg/L and 300g/L, the effluent COD was reduced to below 200mg/L. The COD removal rate reached over 96%, meeting the remediation requirements for contaminated groundwater. The polluted membrane materials were cleaned using a thermal-alkaline washing method, resulting in a membrane flux recovery rate of over 96%. The membrane filtration pretreatment preferentially removed oils and macromolecular organic matter, effectively reducing the pollutant load and ozone consumption during the subsequent ozonation stage. The ozonation process further degraded residual soluble organic compounds remaining from the membrane filtration phase, thereby enhancing the overall pollutant removal efficiency. These two technologies demonstrate excellent synergistic effects, ultimately forming an environmentally friendly short-process ex-situ groundwater remediation system that generates no secondary pollution.

Key words: oil contaminated site, groundwater, extraction-treatment, anti-fouling membrane, catalytic ozonation, short-process treatment

摘要：

石油污染场地地下水污染物成分复杂，毒性大，水质水量波动大，且具有含油含浊、高盐高有机负荷的特点，宜采用抽出-处理模式进行污染地下水异位修复。本研究采用耐油抗污染膜材料直接过滤技术耦合臭氧催化氧化技术对污染地下水进行修复，结果表明耦合工艺能有效降低水中的有机物含量。当超滤膜和纳滤膜的运行压力分别为0.2MPa和0.7MPa、臭氧投加量和催化剂投加量分别为50mg/L和300g/L时，出水化学需氧量（COD）降低至200mg/L以下，COD去除率达到96%以上，可满足污染地下水的修复要求。污染的膜材料通过热碱洗方式进行清洗，膜通量恢复率达到96%以上。膜过滤预处理优先去除油类及大分子有机物，为臭氧氧化阶段减轻了污染负荷，减少了臭氧消耗，臭氧氧化阶段深度降解膜过滤阶段残留的溶解性有机物，提高了污染物总体去除率，两种技术达到了良好的协同作用，形成了无二次污染的地下水异位修复绿色短程处理技术。

关键词: 石油污染场地, 地下水, 抽出-处理, 抗污染膜, 臭氧催化氧化, 短程处理

CLC Number:

X703.1

WANG Hao, LI Mengqi, WANG Qingji, WANG Lingyun, LUO Zhen, SONG Quanwei, LI Xingchun, HE Xuwen. Short-process treatment technology for ex-situ remediation of groundwater in oil-contaminated sites[J]. Chemical Industry and Engineering Progress, 2025, 44(9): 5491-5502.

王浩, 李梦琪, 王庆吉, 王凌匀, 罗臻, 宋权威, 李兴春, 何绪文. 石油污染场地地下水异位修复短程处理工艺[J]. 化工进展, 2025, 44(9): 5491-5502.

Figures/Tables 18

项目	数据
pH	7.1~8.9
浊度/NTU	190~320
含油量/mg·L^-1	20~200
COD/mg·L^-1	2100~4900
DOC/mg·L^-1	420~1800
电导率/mS·cm^-1	70~90

项目	Titan-UF-70	Titan-NF-500
形状	平板膜	平板膜
截留分子量	70kDa	500Da
运行pH范围	1~13.5	1~13.5
最大含油浓度	≤10000mg/L	—

n	膜污堵模型	线性公式
0	滤饼层污堵	$J s - 1 = 1 + K v V s$
1.0	中间污堵	$(l n J s) 0.5 = - K v V s$
1.5	标准污堵	$J s 0.5 = 1 +$ $K v$ / $2 V s$
2.0	完全污堵	$J s = 1 - K v V s$

n	膜污堵模型	线性公式
0	滤饼层污堵	$J s - 1 = 1 + K v V s$
1.0	中间污堵	$(l n J s) 0.5 = - K v V s$
1.5	标准污堵	$J s 0.5 = 1 +$ $K v$ / $2 V s$
2.0	完全污堵	$J s = 1 - K v V s$

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