Remediation of LNAPL Contaminated Groundwater Using Plant-Assisted Biostimulation and Bioaugmentation Methods

Yadav, Brijesh Kumar; Ansari, Faiz Ahmad; Basu, Shreejita; Mathur, Anuj

doi:10.1007/s11270-013-1793-9

Cited by 21 publications

(11 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The toluene‐contaminated water (490 ppm) was prepared with an oversaturated stock solution in Millipore water. Batch experiments [ 6 ] proved that the collected groundwater had sufficient nutrients to support the biodegradation of toluene. Preliminary column experiments were conducted to characterize the physical and hydrological parameters, as listed in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

“…In this way, one can construct a treatment wetland over the surface of polluted sites to allow the infiltration of root zone water to polluted deep subsurface. As root zone water has a vast diversity of microbes, it can improve the microbial density and activities over there [ 6 ] for restricting the movement of LNAPL.…”

Section: Introductionmentioning

confidence: 99%

“…Yadav et al. [ 6 ] used treatment wetlands to compare plant‐enhanced bioremediation with bio‐stimulation and bioaugmentation and found that the rate of degradation of toluene increased significantly in plant‐assisted bioaugmentation and bio‐stimulation. Similarly, Basu et al.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In Situ Bioremediation of Toluene‐Polluted Vadose Zone: Integrated Column and Wetland Study

Basu

Yadav

Mathur

et al. 2020

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

A vertical soil column setup integrated with wetlands is developed to study the biodegradation and transport of toluene, a light non‐aqueous phase liquid (LNAPL), in the subsurface environment. LNAPL‐contaminated water is applied to infiltrate from the top of the soil column. The observed and simulated breakthrough curves show high equilibrium concentration at top ports rather than at lower ports, indicating effective toluene biodegradation with soil depth. The observed equilibrium concentration of toluene is higher in the case of unplanted wetland, asserting an accelerated biodegradation rate in the planted case. A difference in the relative concentration of toluene between input and output fluxes at 100 h is found as 13.34% and 30.86% for planted and unplanted wetland setups, respectively. Estimated biodegradation rates show that toluene degradation is 2.5 times faster in the planted wetland setup. In addition, the difference in the observed bacterial count and dissolved oxygen prove that toluene degraded aerobically at a faster rate in the planted setup. Simulations show that as time reached 80–100 h, there is no significant change in concentration profile, thereby confirming the equilibrium condition. The results of this study will be useful to frame plant‐assisted bioremediation techniques for LNAPL‐contaminated soil–water resources in the field.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ Bioremediation of Toluene‐Polluted Vadose Zone: Integrated Column and Wetland Study

Basu

Yadav

Mathur

et al. 2020

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…Molecular diffusion and mechanical dispersion along with advective flux cause spreading of dissolved plume to downgradient receiving locations (Das, 2002;Yadav and Hassanizadeh, 2011;Picone et al 2013). On the other hand, native potential microbes play significant role to degrade the dissolved LNAPL from polluted zone (Yadav et al 2013;Basu et al 2015, Mustapha et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments

Gupta

Yadav

2019

J. Environ. Eng.

View full text Add to dashboard Cite

The focus of this study was to investigate fate and transport of toluene, a light non-aqueous phase liquids (LNAPL), in subsurface under dynamic groundwater table conditions. A series of experiments were conducted using two-dimensional (2-D) sand tank setup having the dimension of 125cm L×90cm H×10cm W and integrated with an auxiliary column of inner diameter 14 cm and height 120 cm. In the beginning a steady state flow and LNAPL transport experiment was conducted under stable groundwater table condition. Thereafter, three groundwater table fluctuation experiments were conducted by rising and falling groundwater table in 2, 4 and 8 hours to maintain a rapid, general, and slow fluctuation conditions respectively. Pure phase of toluene was injected at the rate of 1mL/minute for a total duration of 5 minutes. The soil-water and soil vapor samples were periodically collected and analyzed for toluene concentrations. Later, the representation of 2-D sand tank setup was numerically simulated to get the response of flow and the LNAPL transport under varying groundwater table conditions. The analysis of the results show that a large LNAPL pool area (250 cm 2) gets developed under rapid fluctuating groundwater condition which significantly enhances the dissolution rate and contributes for a high concentration of

show abstract

“…The simulation domain representing duplex-CW2 and CW3 shows complete degradation of toluene due to the comparatively high nutrient dose as compared to CW1. This high removal efficiency of toluene is apparently due to biostimulation or aerobic growth of heterotrophic bacteria as fortified by the findings of Yadav et al (2014). Similarly, Eckert and Appelo (2002) observed that the applied nitrate concentration accelerated the bio-kinetic reactions in the duplex-CWs.…”

Section: Toluenementioning

confidence: 75%

Treatment of petroleum refinery wastewater with constructed wetlands

Mustapha¹

View full text Add to dashboard Cite

This study examined the performance of pilot scale vertical subsurface flow constructed wetlands (VSF-CW) planted with three indigenous plants, i.e. Typha latifolia, Cyperus alternifolius and Cynodon dactylon (L.) Pers., in removing heavy metals from secondary treated refinery wastewater under tropical conditions. The total heavy metal concentrations in the influent amounted to 15.6 mg Cu/L, 13.2 mg Cr/L, 12.4 mg Zn/L, 4.4 mg Pb/L 0.93 mg Cd/L and 68.9 mg Fe/L. The T. latifolia planted VSF-CW had the best heavy metal removal performance, followed by the C. alternifolius planted VSF CW and then the C. dactylon planted VSF-CW. The data indicated that Cu, Cr, Zn, Pb, Cd and Fe were accumulated in the plants at all the three VSF-CWs. However, this accumulation of the heavy metals in the plants accounted for only a rather small fraction (0.09-16 %) of the overall heavy metal removal by the wetlands. The plant roots accumulated the highest amount of heavy metals, followed by the leaves and then the stem. Cr and Fe were mainly retained in the roots of T. latifolia, C. alternifolius and C. dactylon (TF < 1), meaning that the Cr and Fe were only partially transported to the leaves of these plants. The concentrations of the six heavy metals investigated in the shoots and roots of the three indigenous plants exceeded reported threshold limits. This study showed that VSF-CWs planted with T. latifolia, C. alternifolius and C. dactylon can be used for the large-scale removal of heavy metals from secondary refinery wastewater under tropical conditions.

show abstract

Remediation of LNAPL Contaminated Groundwater Using Plant-Assisted Biostimulation and Bioaugmentation Methods

Cited by 21 publications

References 26 publications

In Situ Bioremediation of Toluene‐Polluted Vadose Zone: Integrated Column and Wetland Study

In Situ Bioremediation of Toluene‐Polluted Vadose Zone: Integrated Column and Wetland Study

Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments

Treatment of petroleum refinery wastewater with constructed wetlands

Contact Info

Product

Resources

About