scholarly journals Application of permeable reactive barrier in groundwater remediation

2019 ◽  
Vol 136 ◽  
pp. 06021
Author(s):  
Qianfeng He ◽  
Shihui Si ◽  
Jun Yang ◽  
Xiaoyu Tu
Keyword(s):  
Groundwater Remediation ◽  
Low Cost ◽  
Structure Type ◽  
Permeable Reactive Barrier ◽  
Term Operation ◽  
Reactive Barrier ◽  
External Power ◽  
Remediation Design

As a new in-situ remediation of groundwater, compared with the traditional “pump and treat” technology, the permeable reactive barrier (PRB) has the advantages of low cost, no external power, the small disturbance to groundwater, small secondary pollution and long-term operation, this paper introduces the basic concept of PRB, technical principle, structure type, the principle of active materials selection and mechanisms of remediation, design and installation factors, it provides ideas for further research and application of PRB technology in groundwater remediation projects in China.

Ammonium removal from groundwater using a zeolite permeable reactive barrier: a pilot-scale demonstration

2014 ◽  
Vol 70 (9) ◽  
pp. 1540-1547 ◽  
Author(s):  
Shengpin Li ◽  
Guoxin Huang ◽  
Xiangke Kong ◽  
Yingzhao Yang ◽  
Fei Liu ◽  
...  
Keyword(s):  
Sustainable Use ◽  
Pilot Scale ◽  
Field Application ◽  
Permeable Reactive Barrier ◽  
Capacity Limits ◽  
Term Operation ◽  
Reactive Barrier ◽  
N Removal

In situ remediation of ammonium-contaminated groundwater is possible through a zeolite permeable reactive barrier (PRB); however, zeolite's finite sorption capacity limits the long-term field application of PRBs. In this paper, a pilot-scale PRB was designed to achieve sustainable use of zeolite in removing ammonium (NH4+-N) through sequential nitrification, adsorption, and denitrification. An oxygen-releasing compound was added to ensure aerobic conditions in the upper layers of the PRB where NH4+-N was microbially oxidized to nitrate. Any remaining NH4+-N was removed abiotically in the zeolite layer. Under lower redox conditions, nitrate formed during nitrification was removed by denitrifying bacteria colonizing the zeolite. During the long-term operation (328 days), more than 90% of NH4+-N was consistently removed, and approximately 40% of the influent NH4+-N was oxidized to nitrate. As much as 60% of the nitrate formed in the PRB was reduced in the zeolite layer after 300 days of operation. Removal of NH4+-N from groundwater using a zeolite PRB through bacterial nitrification and abiotic adsorption is a promising approach. The zeolite PRB has the advantage of achieving sustainable use of zeolite and immediate NH4+-N removal.

Evaluation of permeable reactive barrier (PRB) integrity using electrical imaging methods

Geophysics ◽  
2003 ◽  
Vol 68 (3) ◽  
pp. 911-921 ◽  
Author(s):  
Lee Slater ◽  
Andrew Binley
Keyword(s):  
Geophysical Methods ◽  
Permeable Reactive Barrier ◽  
Electrical Measurements ◽  
Cross Sectional ◽  
Imaging Methods ◽  
Reactive Barrier ◽  
Electrical Imaging ◽  
Granular Iron

The permeable reactive barrier (PRB) is a promising in‐situ technology for treatment of hydrocarbon‐contaminated groundwater. A PRB is typically composed of granular iron which degrades chlorinated organics into potentially nontoxic dehalogenated organic compounds and inorganic chloride. Geophysical methods may assist assessment of in‐situ barrier integrity and evaluation of long‐term barrier performance. The highly conductive granular iron makes the PRB an excellent target for conductivity imaging methods. In addition, electrochemical storage of charge at the iron–solution interface generates an impedance that decreases with frequency. The PRB is thus a potential induced polarization (IP) target. Surface and cross‐borehole electrical imaging (conductivity and IP) was conducted at a PRB installed at the U.S. Department of Energy's Kansas City plant. Poor signal strength (25% of measurements exceeding 8% reciprocal error) and insensitivity at depth, which results from current channeling in the highly conductive iron, limited surface imaging. Crosshole 2D and 3D electrical measurements were highly effective at defining an accurate, approximately 0.3‐m resolution, cross‐sectional image of the barrier in‐situ. Both the conductivity and IP images reveal the barrier geometry. Crosshole images obtained for seven panels along the barrier suggest variability in iron emplacement along the installation. On five panels the PRB structure is imaged as a conductive feature exceeding 1 S/m. However, on two panels the conductivity in the assumed vicinity of the PRB is less than 1 S/m. The images also suggest variability in the integrity of the contact between the PRB and bedrock. This noninvasive, in‐situ evaluation of barrier geometry using conductivity/IP has broad implications for the long‐term monitoring of PRB performance as a method of hydrocarbon removal.

scholarly journals Reactive Sandpacks for In-Situ Treatment of Construction Dewatering Effluent

2013 ◽  
Vol 2 (2) ◽  
pp. 85-87 ◽  
Author(s):  
Elizabeth Priebe ◽  
David R. Lee
Keyword(s):  
Groundwater Contamination ◽  
Contaminated Soils ◽  
Groundwater Remediation ◽  
Permeable Reactive Barrier ◽  
Hypothetical Situation ◽  
Environmental Liabilities ◽  
Reactive Material ◽  
Groundwater Contaminants ◽  
Reactive Barrier

Dealing with contaminated effluent can be problematic when dewatering is required in the course of removing buried tanks, excavating contaminated soils or constructing groundwater remediation systems. An engineering solution put forward in this paper is the emplacement of a sandpack, around the dewatering well(s), that reacts with and sequesters groundwater contaminants of concern. If an appropriate granular reactive material is available, placing that material around the dewatering well screen can achieve a degree of contaminant treatment in-situ that may considerably reduce the costs of storing, securing and treating the water before it is released. In the preferred situation, the contaminants remain underground and the extracted water is suitable for surface release as it is pumped from the ground. We used laboratory columns of granular reactive material (clinoptilolite) and a radiostrontium tracer to evaluate the usefulness of this approach in a hypothetical situation where the water table needed to be lowered 2 m in order to install a permeable reactive barrier. Results were consistent with the concept of reducing the environmental liabilities of construction dewatering in areas of groundwater contamination.

scholarly journals Testing the Suitability of Zerovalent Iron Materials for Reactive Walls

2005 ◽  
Vol 2 (1) ◽  
pp. 71 ◽  
Author(s):  
Chicgoua Noubactep ◽  
Günther Meinrath ◽  
Peter Dietrich ◽  
Martin Sauter ◽  
B. J. Merkel
Keyword(s):  
Groundwater Remediation ◽  
Corrosion Behaviour ◽  
Low Cost ◽  
Permeable Reactive Barriers ◽  
Zerovalent Iron ◽  
Reactive Material ◽  
Reactive Additives ◽  
Application Specific

Environmental Context. Groundwater remediation is generally a costly, long-term process. In situ remediation using permeable reactive barriers, through which the groundwaters pass, is a potential solution. For redox-sensitive contaminants in groundwater, a metallic iron barrier (zerovalent iron, ZVI) can immobilize or degrade these dissolved pollutants. Scrap iron materials are a low-cost ZVI material but, because of the wide variation of scrap metal compositions, testing methods for characterizing the corrosion behaviour need to be developed. Abstract. Zerovalent iron (ZVI) has been proposed as reactive material in permeable in situ walls for contaminated groundwater. An economically feasible ZVI-based reactive wall requires cheap but efficient iron materials. From an uranium treatability study and results of iron dissolution in 0.002 M EDTA by five selected ZVI materials, it is shown that current research and field implementation is not based on a rational selection of application-specific iron metal sources. An experimental procedure is proposed which could enable a better material characterization. This procedure consists of mixing ZVI materials and reactive additives, including contaminant releasing materials (CRMs), in long-term batch experiments and characterizing the contaminant concentration over the time.

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