Biodegradation of organic compounds in unsaturated soil: role in reducing risk from vapor intrusion

Picone, S.; Grotenhuis, J.T.C.; Valstar, Johan; Gaans, Pauline van; Rijnaarts, H.H.M.

doi:10.3997/2214-4609-pdb.150.h04

Cited by 3 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ATES involves the transportation of large volumes of groundwater, for instance 261 million m 3 groundwater was displaced by ATES in the Netherlands in 2013(Verburg et al 2010 ). Hence, interference between CVOCs and ATES application at the same site can be a threat not only to the quality of groundwater and drinking water but also to human health due to the vapour intrusion especially of the carcinogenic intermediate VC (Picone 2012 ). Faced with the long duration commonly needed for natural attenuation of CVOCs in the subsurface (ITRC 2008 ; Wilson et al 2007 ) and the increasing demand for ATES, the combination of ATES and stimulated bioremediation might be prosperous to reduce the increasing pressure on the use of the subsurface.…”

Section: Introductionmentioning

confidence: 99%

Combination of aquifer thermal energy storage and enhanced bioremediation: resilience of reductive dechlorination to redox changes

Gaans

Smit

et al. 2015

Appl Microbiol Biotechnol

View full text Add to dashboard Cite

To meet the demand for sustainable energy, aquifer thermal energy storage (ATES) is widely used in the subsurface in urban areas. However, contamination of groundwater, especially with chlorinated volatile organic compounds (CVOCs), is often being encountered. This is commonly seen as an impediment to ATES implementation, although more recently, combining ATES and enhanced bioremediation of CVOCs has been proposed. Issues to be addressed are the high water flow velocities and potential periodic redox fluctuation that accompany ATES. A column study was performed, at a high water flow velocity of 2 m/h, simulating possible changes in subsurface redox conditions due to ATES operation by serial additions of lactate and nitrate. The impacts of redox changes on reductive dechlorination as well as the microbial response of Dehalococcoides (DHC) were evaluated. The results showed that, upon lactate addition, reductive dechlorination proceeded well and complete dechlorination from cis-DCE to ethene was achieved. Upon subsequent nitrate addition, reductive dechlorination immediately ceased. Disruption of microorganisms’ retention was also immediate and possibly detached DHC which preferred attaching to the soil matrix under biostimulation conditions. Initially, recovery of dechlorination was possible but required bioaugmentation and nutrient amendment in addition to lactate dosing. Repeated interruption of dechlorination and DHC activity by nitrate dosing appeared to be less easily reversible requiring more efforts for regenerating dechlorination. Overall, our results indicate that the microbial resilience of DHC in biosimulated ATES conditions is sensitive to redox fluctuations. Hence, combining ATES with bioremediation requires dedicated operation and monitoring on the aquifer geochemical conditions.Electronic supplementary materialThe online version of this article (doi:10.1007/s00253-015-7241-6) contains supplementary material, which is available to authorized users.

show abstract

Section: Introductionmentioning

confidence: 99%

Combination of aquifer thermal energy storage and enhanced bioremediation: resilience of reductive dechlorination to redox changes

Gaans

Smit

et al. 2015

Appl Microbiol Biotechnol

View full text Add to dashboard Cite

show abstract

“…RTMs have shown that hydrocarbons in groundwater can trigger geochemical and biological reactions. Previous RTM studies have simulated the migration of PHC plumes in groundwater by combining the effects of advection, mechanical dispersion, and molecular diffusion (Cavelan et al., 2022; Picone, 2012), equilibrium and kinetic dissolution of PHC compounds (Lekmine et al., 2014; Molson & Eng, 2011), aerobic and anaerobic PHC biodegradation (Colombani et al., 2009; Miles et al., 2008; Ng et al., 2015; Prommer et al., 2002; Schreiber et al., 2004; Vencelides et al., 2007), dissolution and precipitation of carbonate minerals (Maurer & Rittmann, 2004; Spence et al., 2005), sorption of dissolved PHC to organic matter in sediments (Gharedaghloo & Price, 2021; Valsala & Govindarajan, 2018), and (de)sorption of mobilized ions (Cozzarelli et al., 2016; Miles et al., 2008; Ziegler et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Reactive Transport Modeling for Exploring the Potential of Water Quality Sensors to Estimate Hydrocarbon Levels in Groundwater

Wu,

Wagterveld,

van Breukelen

2024

Water Resources Research

View full text Add to dashboard Cite

Petroleum products have contaminated groundwater with harmful organic compounds, such as benzene, toluene, ethylbenzene, and xylenes (BTEX). Collecting and analyzing polluted groundwater samples is expensive and undertaken infrequently. However, quick remedial action in case of unexpected events requires continuous monitoring. In‐situ water quality sensors (pH, EC, DO, ORP) may show correlations with the components of dissolved petroleum hydrocarbon (PHC) such as aromatics and non‐volatile mobile fractions. Correlations are prerequisite to ultimately develop real‐time prediction models. Since suitable field data sets are limited, we simulated the fate of hydrocarbons in groundwater under various realistic conditions using a reactive transport model as novel approach to explore when, where, and why correlations occur. A stationary oil source zone continuously dissolved at the top of a heterogeneous and shallow sandy aquifer over a two‐dimensional cross‐section. Our model considered transient conditions (fluctuating water table) and spatially uniform hydrogeochemical composition. We observed a strong correlation between PHCs and water quality sensors (rolling Spearman's correlation > |0.8|) at varying periods. These correlations are strongly affected by the location of observation wells, the aquifer's hydraulic conductivity, and the availability of calcite and oxide minerals, and other electron acceptors. DO and ORP are significant for the early detection of hydrocarbon contamination, whereas pH and EC are important features for the long‐term monitoring of hydrocarbons. Our findings lay the foundation for the subsequent development of a data analysis model to detect and estimate in real time PHC levels in groundwater using in‐situ water quality sensors.

show abstract

“…Among BTEX, toluene is relatively more soluble in water, with solubility of 535 mg/L at 25°C (El-Naas et al, 2014), and the log Kow of toluene is 2.75, indicating that toluene is more Lin et al 10.3389/fmicb.2023.1122966 Frontiers in Microbiology 02 frontiersin.org easily distributed in the aqueous phase than in the soil (Šoštarić et al, 2016). Long-term exposure to BTEX compounds has adverse effects on human health (such as damaging the central nervous system) and ecosystem functions (such as inhibiting the survival of earthworms; Picone, 2012). Therefore, the removal of BTEX from groundwater, especially toluene, is essential to ensure the safety of water (Asenjo et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Bioenhanced degradation of toluene by layer-by-layer self-assembled silica-based bio-microcapsules

Lin

Yang²,

Li³

et al. 2023

Front. Microbiol.

View full text Add to dashboard Cite

In this study, micron-sized monodisperse SiO2 microspheres were used as sacrificial templates, and chitosan/polylactic acid (CTS/PLA) bio-microcapsules were produced using the layer-by-layer (LBL) assembly method. Microcapsules isolate bacteria from their surroundings, forming a separate microenvironment and greatly improving microorganisms’ ability to adapt to adverse environmental conditions. Morphology observation indicated that the pie-shaped bio-microcapsules with a certain thickness could be successfully prepared through LBL assembly method. Surface analysis showed that the LBL bio-microcapsules (LBMs) had large fractions of mesoporous. The biodegradation experiments of toluene and the determination of toluene degrading enzyme activity were also carried out under external adverse environmental conditions (i.e., unsuitable initial concentrations of toluene, pH, temperature, and salinity). The results showed that the removal rate of toluene by LBMs can basically reach more than 90% in 2 days under adverse environmental conditions, which is significantly higher than that of free bacteria. In particular, the removal rate of toluene by LBMs can reach four times that of free bacteria at pH 3, which indicates that LBMs maintain a high level of operational stability for toluene degradation. Flow cytometry analysis showed that LBL microcapsules could effectively reduce the death rate of the bacteria. The results of the enzyme activity assay showed that the enzyme activity was significantly stronger in the LBMs system than in the free bacteria system under the same unfavorable external environmental conditions. In conclusion, the LBMs were more adaptable to the uncertain external environment, which provided a feasible bioremediation strategy for the treatment of organic contaminants in actual groundwater.

show abstract

Biodegradation of organic compounds in unsaturated soil: role in reducing risk from vapor intrusion

Cited by 3 publications

References 2 publications

Combination of aquifer thermal energy storage and enhanced bioremediation: resilience of reductive dechlorination to redox changes

Combination of aquifer thermal energy storage and enhanced bioremediation: resilience of reductive dechlorination to redox changes

Reactive Transport Modeling for Exploring the Potential of Water Quality Sensors to Estimate Hydrocarbon Levels in Groundwater

Bioenhanced degradation of toluene by layer-by-layer self-assembled silica-based bio-microcapsules

Contact Info

Product

Resources

About