Remediation Technologies
Loureiro focuses on the evaluation, design, and implementation of several environmental remediation technologies. The qualitative services provided by our team of experienced engineers and scientists in the field of in situ remediation gives us a remarkable edge above our competitors here in the United States and internationally. It is our intention to bring this wealth of experience and work ethic to each of our clients. A sampling of the remediation services we have innovated and successfully implemented for our clients include:
Comprehensive Services
- Design-build
- Installation oversight
- Oversight of equipment fabrication vendors
- Operations and performance sampling
- Regulatory negotiations
- Peer review and optimization recommendations
Loureiro provides a full suite of bioremediation services, including treatability testing, design and application strategies, and full-scale implementation. Each of these services can be used individually, but the best results are obtained when these services are used together as part of an integrative approach.
Photo: Enhanced Bioremediation Injection, California
Design Services
Loureiro has completed designs for ISCO projects using several different application strategies, including direct injection, pull-push, and re-circulation. We scale up our treatability results to refine the design parameters for a field application of ISCO. Site-specific factors such as the contaminant(s), hydrogeology, and site logistics are taken into consideration when developing the most appropriate application approach.
For example, a less-experienced firm might conduct an ISCO injection event for a highly soluble contaminant (e.g., 1,4-dioxane) via direct injection. In this particular example, the injection fluid can often displace or “push” the contaminant, increasing the overall extent of the impacts. Loureiro will take factors such as the contaminant solubility into account and design an application that uses recirculation or pull-push strategies. While these ISCO applications can be more expensive than direct injection, they minimize application risks and end up being less expensive over the life cycle of the project.
Implementation
Loureiro is renowned for our high quality implementation services with a stellar health and safety record. We have successfully implemented ISCO to treat both large and small sites with numerous site-specific challenges including:
- Active/operational industrial facilities
- Sensitive and restricted areas at government facilities
- Busy commercial districts
- Suburban neighborhoods requiring Loureiro to be off site before schools let out
- Indoor, active facilities
Pre-Application Soil Cores
Post-Application Soil Cores
Loureiro was among the first companies to apply activated persulfate and stabilized hydrogen peroxide ISCO technologies. Loureiro has published book chapters, assisted with guidance documents, and completed government funded field and bench studies. Our engineers and scientists have experience in the following oxidant systems:
- sodium persulfate, unactivated and activated
- potassium persulfate (slow-release), unactivated and activated
- potassium and sodium permanganate
- hydrogen peroxide, with and without the need for catalysts or stabilizers
- Ozone
In Situ Chemical Reduction – ZVI Mixing via ALLU Bucket
Loureiro has designed a significant number of projects using several different application strategies depending upon the site geology and project goals.
Loureiro is renowned for our high quality implementation services with a stellar health and safety record. We have successfully implemented ISCR to treat both large and small sites with numerous site-specific challenges.
Loureiro is nationally recognized in the design, evaluation, and implementation of air sparging and soil vapor extraction (AS and SVE), and thermally enhanced SVE (TSVE) technologies for a variety of contaminants of concern. Loureiro helped pioneer these remedial technologies with the first U.S. application of air sparging in 1989 and later authored the American Petroleum Institute’s Air Sparging Guidance Document. Additionally, Loureiro worked with the U.S. Environmental Protection Agency (EPA) to develop an SVE closure program for the Picillo Farm Superfund Site in Coventry, RI, which subsequently served as the basis for the EPA’s national SVE site closure guidance document.
Loureiro has expertise evaluating the use of AS/SVE systems in conjuction with other technologies such as oxygen biosparging, bioventing, biostimulation, and aerobic trench systems. Loureiro personnel have empoyed these technologie at sites in the U.S., Europe, and Asia. Our experience with evaluating, designing, and implementing AS/SVE systems includes:
- Determining the applicability of AS and SVE for your site conditions, including:
- Radius of influence investigations
- Modeling to determine vadose and saturated zone soil permeabilities
- Subsurface utilities and other potential short circuiting mechanisms
- Potential for reduced pore-volume flushing due to low permeability soils
- Setting realistic cleanup goals based upon sound science and engineering
- Estimating clean-up times
- Modeling the impact of a SVE remedy on future soil leaching criteria
- Providing credible representation to regulators and the public
For list of our short courses, peer reviewed publications, and conference proceedings, click here.
Want to know a bit more about how air sparging and soil vapor extraction works? Click here.
Email Loureiro at [email protected] for case studies associated with our AS/SVE remedial technology experience.
Sometimes groundwater extraction and treatment (i.e., pump and treat [P&T]) makes the most sense for sites where:
- Capital expenditures for other remedial technologies are significant relative to long-term operation and maintenance of an extraction system
- Subsurface conditions are not amenable to other technologies
- Sensitive receptors are located immediately downgradient of impacts
- Regulations require hydraulic capture
Loureiro has designed, installed, and operated several remedial systems involving hydraulic capture:
- Superfund level groundwater and fate and transport modeling
- Well, conveyance, and equipment construction design and installation oversight
- Value engineering and design calculations to meet discharge permitting requirements
- Operation, maintenance, and monitoring services
These remedial technologies are supported by our in-house treatability laboratory. The ability to test each of these technologies at the bench-scale prior to implementation allows Loureiro to identify potential failure mechanisms and refine anticipated costs.
Email Loureiro at [email protected] for case studies associated with remedial experience.
