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污染場(chǎng)地蒸氣入侵的風(fēng)險(xiǎn)評(píng)估(英文版)

包郵 污染場(chǎng)地蒸氣入侵的風(fēng)險(xiǎn)評(píng)估(英文版)

出版社:科學(xué)出版社出版時(shí)間:2023-03-01
開本: B5 頁(yè)數(shù): 160
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污染場(chǎng)地蒸氣入侵的風(fēng)險(xiǎn)評(píng)估(英文版) 版權(quán)信息

污染場(chǎng)地蒸氣入侵的風(fēng)險(xiǎn)評(píng)估(英文版) 本書特色

一本書讀懂在土壤蒸氣入侵(揮發(fā)性污染物室內(nèi)吸入)過(guò)程中,地下?lián)]發(fā)性污染物遷移的規(guī)律

污染場(chǎng)地蒸氣入侵的風(fēng)險(xiǎn)評(píng)估(英文版) 內(nèi)容簡(jiǎn)介

這本書研究在土壤蒸氣入侵(揮發(fā)性污染物室內(nèi)吸入)過(guò)程中,地下?lián)]發(fā)性污染物遷移的規(guī)律。土壤蒸氣侵入是建筑物居住者接觸地下化學(xué)物質(zhì)的主要途徑,其風(fēng)險(xiǎn)評(píng)估決定了土地再開發(fā)中土壤/地下水中揮發(fā)性污染物的標(biāo)準(zhǔn)。本書介紹了蒸氣侵入近期新的理論和實(shí)踐進(jìn)展,包括蒸氣侵入的分析和數(shù)值模擬,美國(guó)環(huán)境保護(hù)署的蒸氣入侵和石油蒸氣入侵?jǐn)?shù)據(jù)庫(kù)的統(tǒng)計(jì)結(jié)果,石油蒸氣入侵的挑戰(zhàn),以及在已開發(fā)污染場(chǎng)地和土地再開發(fā)中進(jìn)行蒸氣侵入風(fēng)險(xiǎn)評(píng)估的現(xiàn)場(chǎng)實(shí)踐。此外,還總結(jié)了目前在蒸汽入侵風(fēng)險(xiǎn)評(píng)估中各種應(yīng)用方法的優(yōu)勢(shì)和局限性,為今后更好地理解土壤蒸氣入侵風(fēng)險(xiǎn)特征的研究奠定了基礎(chǔ)。

污染場(chǎng)地蒸氣入侵的風(fēng)險(xiǎn)評(píng)估(英文版) 目錄

Contents
“土壤環(huán)境與污染修復(fù)叢書”序
Chapter 1 Screening Models of Vapor Intrusion 1
1.1 Introduction 1
1.2 The general equation governing soil gas transport 4
1.2.1 Soil gas transport involving no biodegradation 6
1.2.2 The role of biodegradation in VI 10
1.2.3 Soil gas transport involving biodegradation 12
1.3 Contaminant soil gas entry into buildings 21
1.3.1 The equation governing escape of contaminant from the soil 21
1.3.2 Indoor air concentration calculation 25
1.4 The limits of VI screening tools 28
References 32
Chapter 2 Numerical Models of Vapor Intrusion 41
2.1 The soil gas transport involving no biodegradation 41
2.2 The soil gas transport involving biodegradation 45
2.3 Soil gas entry into the building 48
2.4 Calculation of indoor air concentration 50
References 52
Chapter 3 US EPA’s Vapor Intrusion Database and Generic Attenuation Factor 57
3.1 Introduction of US EPA’s vapor intrusion database 57
3.2 Examinations of the database based on modeling 58
3.3 Examinations of the database based on environmental factors 61
3.4 The generic attenuation factors and influences of background sources 62
3.5 The importance of appropriate source characterization 66
References 71
Chapter 4 US EPA’s PVI Database and Vertical Screening Distances 74
4.1 US EPA’s petroleum vapor intrusion database 74
4.2 Vertical screening distances 75
4.3 The capillary effect in cases of dissolve sources 75
4.3.1 Model validation 76
4.3.2 Examinations for cases with source in the dissolved phase 77
4.3.3 Numerical simulations for different soil textures 80
4.4 The role of soil texture in NAPL source cases 86
4.4.1 Numerical simulations 86
4.4.2 Analytical analysis 89
4.4.3 Refined vertical separation distances based on soil types 91
References 94
Chapter 5 Preferential Pathways and the Building Pressure Cycling Method 96
5.1 Introduction of preferential pathway and building pressure cycling 96
5.2 Numerical simulations of VI involving preferential pathway and BPC 97
5.2.1 Model validation 98
5.2.2 The influences of soil permeability and BPC on indoor quality 100
5.3 The analytical solutions for the BPC performance in the short term 103
5.4 Numerical simulations for the BPC performance in the short term 108
5.4.1 Model validation 109
5.4.2 Influences of environmental factors 110
5.4.3 Requirements for an effective BPC application 112
5.5 The application of building pressure cycling to generate aerobic barrier in petroleum vapor intrusion 116
References 121
Chapter 6 Vapor Intrusion Risk Assessments in Brownfield Redevelopment 124
6.1 The basic concept and process of vapor intrusion 126
6.2 The basic theory of the J-E model 128
6.2.1 Fluxes from the source to the soil near the building calculation 130
6.2.2 Calculation of the flux from the soil around the base of the building to the interior of the building 130
6.2.3 Derivation of indoor gas-phase concentration and attenuation factor 131
6.3 Differences between Volasoil model and J-E model 132
6.3.1 Source concentration calculation 133
6.3.2 Calculation of indoor air exposure concentration 133
6.4 Study of vapor intrusion risk assessment 134
6.5 Application of brownfield vapor intrusion risk assessment 137
6.6 The future of vapor intrusion risk assessment in brownfield redevelopment 141
References 142
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污染場(chǎng)地蒸氣入侵的風(fēng)險(xiǎn)評(píng)估(英文版) 節(jié)選

Chapter 1 Screening Models of Vapor Intrusion 1.1 Introduction Vapor intrusion (VI) models simulate the transport of contaminant soil gas from subsurface sources into the buildings of concern at contaminated sites, concentrating on the prediction of the contaminant concentration attenuation (i.e., concentration reductions) relative to a subsurface concentration during the soil gas transport process and the migration into a building[1], as shown in Figure 1.1. There are two kinds of VI models. One refers to simple risk screening tools, usually one-dimensional (1D) analytical models[2]. The other includes the numerical models, mostly multidimensional and used to study the influences of environmental factors in specific VI scenarios. In the first kind, the prediction may not be so accurate due to the over-simplification of the complicated reality. In contrast, numerical models can simulate more sophisticated cases but require significant computational effort and specialized knowledge, limiting their use by ordinary site investigators. Nonetheless, the differences are not absolute, and predictions by screening models can still be reliable if most essential factors are included in specific VI scenarios. On the other hand, numerical models have become more accessible to ordinary investigators due to the more user-friendly interface of modeling software and the advanced computational capacity of current personal computers. This chapter aims to overview the first kind of VI models with analytical mathematical solutions or VI screening models. In the classic review of VI models by Yao et al.[1], screening models are considered partially based on the previous work on pesticide transport in soil[3-8] and radon vapor intrusion[9-12]. Usually, the soil gas transport part of VI screening models can be viewed as built upon the previous pesticide models[3-6], while the process of entry into the building benefited greatly from earlier studies of radon VI[9-13]. Though the subject has changed from radon to volatile organic compounds (VOCs) such as chlorinated solvents and petroleum products, the general governing equation still works. The earliest pesticide models were developed in the late 1960s[14,15] and have been used to study the fate and transport of pesticides after the injection into the soil. The processes simulated by pesticide models usually include leaching, volatilization, biodegradation, and so on. The pesticide models also consider factors like surface runoff, evapotranspiration, absorption, or drainage in site-specific cases. Obviously, only a part of these elements are relevant to VI and thus included in VI simulations. Radon intrusion models were first introduced in the 1970s[9, 11-13,16,17]. The radon soil gas is believed to enter the indoor space through the foundation cracks or permeable walls, mainly through advection caused by indoor-outdoor pressure differences. Such a pathway is also applied in VI involving VOCs, the source of which, however, is located separately from the target building instead of uniformly distributed in the subfoundation soil as the radon source. This difference is why molecular diffusion due to concentration gradients plays a more important role in VI involving VOCs than radon intrusion. The first VI screening model was the classic Johnson-Ettinger (J-E) model introduced in 1991[18], which is also the most popular one. A complete VI screening model usually describes the whole process from the subsurface source (e.g., the contaminated groundwater) to the building of concern, including soil gas transport, entry into the building, and the calculation of indoor air concentration, as concluded by Yao et al.[1]. For the soil gas transport part, the major differences among screening models are the simplifications of the same general governing equation of convection and diffusion[1]. Then, the screening models employ different assumptions of the entry route through the building foundation, usually involving a dirty floor, a permeable slab or a slab crack. At last, with the calculated contaminant entry rate into the building, the indoor air concentration can be predicted by assuming the indoor space as a continuous-stirred tank. In other words, temporal or spatial variations in contaminant indoor air concentration were not considered in the calculation of indoor concentration in a steady-state. In some cases, an empirical subslab-to-indoor air attenuation factor was used as an alternative to estimating the indoor air concentration with the subslab soil gas concentration. Contaminant vapor transport in the soil involves advection, diffusion, and other mass change terms, such as biodegradation and absorption/desorption, the latter of which only plays a role in transient cases[1]. Currently, it is generally agreed that diffusion dominates soil gas transport in the vadose zone[19, 20], as confirmed by comprehensive numerical simulations of three-dimensional

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