氧气微纳米气泡在地下水原位修复中的应用研究

元妙新; 占升; 张欣; 范占煌; 徐华锺; 陈欢; 魏宇琦

doi:10.12153/j.issn.1674-991X.20220421

氧气微纳米气泡在地下水原位修复中的应用研究

doi: 10.12153/j.issn.1674-991X.20220421

元妙新^1,,
占升¹,
张欣²,
范占煌^1, ,,
徐华锺¹,
陈欢¹,
魏宇琦¹

1.
中节能大地(杭州)环境修复有限公司
2.
中节能工程技术研究院有限公司

基金项目: 国家重点研发计划项目（2018YFC1802300）；中国节能环保集团有限公司重大科技创新项目（cecep-zdkj-2019-012）

详细信息

作者简介:
元妙新（1986—），男，高级工程师，硕士，主要从事环境修复研究，yuanmiaoxin@dadi-ep.com

通讯作者:
范占煌（1980—），男，高级工程师，硕士，主要从事环境修复研究，fanzhanhuang@dadi-ep.com

中图分类号: X523
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出版历程
- 收稿日期: 2022-05-04

Research on the application of oxygen micro-nanobubbles in-situ remediation of groundwater

1.
Cecep Dadi (Hangzhou) Environmental Remediation Co., Ltd.
2.
Cecep Engineering Technology Research Institute Co., Ltd.

摘要

摘要:
微纳米气泡具有气泡粒径小、比表面积大、溶解氧浓度高、在水中停留时间长、传质效率高等特性，因而在地下水有机物污染原位修复领域具有很好的应用前景。选择南方某简易垃圾填埋场作为试验场地，采用微纳米气泡制备-注射一体化装置，研究抽提协同、注射流量、注射持续时间等工艺条件对氧气微纳米气泡传质和地下水污染物降解修复效果的影响。结果表明：相对于普通空气曝气，氧气微纳米气泡在水体内溶解氧浓度峰值更高，持续作用时间更长，抽提作用可显著提高微纳米气泡传质效率，提升影响半径，强化污染物去除效果。多轮注射+抽提联用工艺条件下，注射影响半径可达到4 m，COD去除率达96.1%，NH₃-N去除率达92.4%，但注射停止后存在一定的反弹现象。
- 氧气微纳米气泡 /
- 曝气 /
- 填埋场 /
- 地下水 /
- 原位修复
Abstract:
Micro-nanobubbles have the characteristics of small bubble particle size, large specific surface area, high dissolved oxygen concentration, long residence time in water and high mass transfer efficiency. Therefore, they have a good application prospect in the field of in-situ remediation of organic pollutants in groundwater. A simple landfill in the south of China was selected as the test site, and the micro-nanobubble preparation and injection integrated device was used to study the effects of process conditions such as extraction synergy, injection flow and injection duration on the mass transfer of oxygen micro-nanobubbles and the degradation and remediation of groundwater pollutants. The test showed that compared with ordinary air aeration, the oxygen concentration peak of oxygen micro-nanobubbles in water was higher and lasted longer. The extraction could significantly improve the mass transfer efficiency of micro-nanobubbles, enhance the influence radius and strengthen the degradation and removal effect of pollutants. Under the condition of multi-round injection-extraction combined processes, the injection influence radius could reach 4 m, with the removal rate of COD and NH₃-N reaching 96.1% and 92.4%, respectively. However, there was a certain rebound after the injection was stopped.
- oxygen micro-nanobubbles /
- aeration /
- landfill /
- groundwater /
- in-situ remediation

HTML全文

图 1 空气曝气发生装置

Figure 1. Diagram of air aeration generator

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图 2 微纳米气泡发生装置

Figure 2. Diagram of micro-nanobubble generator

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图 3 试验场地注射井和监测井布置

Figure 3. Layout of injection wells and monitoring wells in the experimental site

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图 4 不同注射源条件DO浓度变化

Figure 4. Variation of DO concentrations under different injection conditions

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图 5 不同注射源条件氧化还原电位变化

Figure 5. Variation of redox potential under different injection conditions

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图 6 注射及注射+抽提工况下MW03井地下水中COD_Cr、NH₃-N浓度变化

Figure 6. Variation of COD_Cr and NH₃-N concentrations in groundwater at MW03 under injection and injection-extraction conditions

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图 7 注射及注射+抽提工况下MW03井地下水中DO浓度和ORP变化

Figure 7. Variation of DO concentrations and ORP in groundwater at MW03 under injection and injection-extraction conditions

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图 8 注射及注射+抽提工况下MW04井地下水中COD_Cr、NH₃-N浓度变化

Figure 8. Variation of COD_Cr and NH₃-N concentrations in groundwater at MW04 under injection and injection-extraction conditions

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图 9 注射及注射+抽提工况下MW04井地下水中DO浓度、ORP变化

Figure 9. Variation of DO concentrations and ORP in groundwater at MW04 under injection and injection-extraction conditions

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图 10 不同注射流量下MW03井地下水中COD_Cr、NH₃-N浓度变化

Figure 10. Variation of COD_Cr and NH₃-N concentrations in groundwater at MW03 under different injection flows

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图 11 不同注射流量下MW03井地下水中DO浓度、ORP变化

Figure 11. Variation of DO concentrations and ORP in groundwater at MW03 under different injection flows

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图 12 不同注射流量下MW04井地下水中COD_Cr、NH₃-N浓度变化

Figure 12. Variation of COD_Cr and NH₃-N concentrations in groundwater at MW04 under different injection flows

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图 13 不同注射流量下MW04井地下水中DO浓度、ORP变化

Figure 13. Variation of DO concentrations and ORP in groundwater at MW04 under different injection flows

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图 14 间歇性注射情景下地下水中COD_Cr变化

Figure 14. Variation of COD_Cr in groundwater under intermittent injection

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图 15 间歇性注射情景下地下水中NH₃-N浓度变化

Figure 15. Variation of NH₃-N concentration in groundwater under intermittent injection

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图 16 间歇性注射情景下地下水中DO浓度变化

Figure 16. Variation of DO concentrations in groundwater under intermittent injection

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图 17 间歇性注射情景下地下水中ORP变化

Figure 17. Variation of ORP in groundwater under intermittent injection

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表 1 地下水检测指标及分析方法

Table 1. Groundwater detection indexes and detection methods

检测指标	检测方式	分析方法
水位、电导率、ORP、DO	现场快速检测
pH、色度、溶解性总固体、总硬度、化学需氧量（COD_Cr）、生化需氧量（BOD₅）、硫化物、阴离子表面活性剂、硫酸盐、氯化物、NH₃-N、总氮、高锰酸盐指数（COD_Mn）	实验室送检	GB/T 14848—2017
砷、镉、铬（六价）、铜、铅、汞、镍	实验室送检	GB/T 14848—2017
挥发性有机物(VOCs)、半挥发性有机物(SVOCs)	实验室送检	GB/T 14848—2017

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表 2 地下水水质检测结果

Table 2. Groundwater quality test results

指标	单位	检测结果	GB/T 14848— 2017 Ⅲ类限值	超标倍数
COD_Cr	mg/L	115
BOD₅	mg/L	8.1
ORP	mV	−82.5
DO	mg/L	1.2
COD_Mn	mg/L	30.9	≤3	9.3
NH₃-N	mg/L	109	≤0.5	217
邻苯二甲酸二甲酯	μg/L	1.3
砷	μg/L	50.8	≤10	4.1

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表 3 不同气泡源特性对比试验条件

Table 3. Experimental conditions for comparison of characteristics of different bubble sources

气泡性质	制备设备	通气量/(L/h)	通气时间/h
毫米级空气气泡	空压机	30	0.5
空气微纳米气泡	微纳米气泡发生装置	30	0.5
氧气微纳米气泡	微纳米气泡发生装置	30	0.5

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表 4 不同注射工况对比试验条件

Table 4. Comparative test conditions under different injection conditions

组别	注射流量/ (m³/h)	注射时间/h	抽提流量/ (m³/h)	抽提时间/h	注射轮次/次	每轮次注射时间段
1	1.0	12	1	12	1	08:00—20:00
2	1.0	12	0	0	1	08:00—20:00
3	1.0	12	1	12	1	08:00—20:00
4	1.5	12	1	12	1	08:00—20:00
5	1.0	36	1	36	3	08:00—20:00
注：组别1、3为相同注射、抽提条件下，不同时间点开展的2组试验。

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表 5 污染物浓度反弹信息

Table 5. Pollutant concentration rebound information

项目	COD_Cr		NH₃-N浓度
项目	MW03井	MW04井	MW03井	MW04井
初始浓度/（mg/L）	543	480	136	102.6
3轮注射后浓度/（mg/L）	21	209	10.3	73.0
污染物去除率/%	96.1	56.5	92.4	28.8
3轮注射后2 d浓度/（mg/L）	170	251	54.1	77.8
污染物去除率/%	68.7	47.7	60.2	24.2

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