Groundwater at a former solvent regeneration site in Békéscsaba (Laundry Co. – dry cleaner’s), was impacted with chlorinated volatile organic compounds (CVOCs)
Groundwater at a former solvent regeneration site in Békéscsaba (Békés County Laundry Co. – dry cleaner’s), was impacted with chlorinated volatile organic compounds (CVOCs). The key CVOCs found at the site include 1,1,1-TCA, PCE, TCE, cisz-DCE, and VC in concentration levels of 10,000-50,000 micrograms per liter. Recognising the useless of common remediation approach that usually concerns pump and treat, an in situ remedy was needed.
The successful bench scale studies led to the application of a mixture of sodium lactate and an in situ PRB (permeable reactive barrier) filled with special additive that stimulate the biogeochemical reductive process. In a series of injections it was used inside the treatment zone, covering an 8x8 meters area. During the five months period of the pilot test, in spite of the continuous inflow of untreated contaminated water, an 80 percent decrease in the concentration of total CVOC, without the accumulation of recalcitrant catabolites was detected inside the treatment zone. The results showed that chlorinated hydrocarbon concentration could be adequately attenuated to merit full-scale application of additives. completely treat the plume area and to create a downgradient barrier at the off site edge of the plume.
The treatment area covers ca. 5 000 m2 with 3 590 boreholes (along 1.2m*1.2m*1.2m triangular grid). Injections were made between the depth of 1.5 to 7 m. During the 8 months of the plume treatment nZVI and nutrient supply were introduc
Resources needed
Energy Efficiency Operational Programme 2007-2013
Evidence of success
At the end of the remediation, the concentration of chlorinated hydrocarbon compounds at each control point decreased below the given limit due to the biological degradation and the chemical reduction. In many cases, comparing to the initial concentrations the reduction was of two orders of magnitude during the intervention.
More than 16.000 m3 underground water and 45.000 tons soil had been cleaned by the project. The treatment area is ca. 5 000 m2.
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Potential for learning or transfer
This practice even the method can be interesting for other regions because of the sustainability effect of the method.
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Tags: Industry, Materials
