SOIL BLENDING
Soil blending is a green-friendly remediation method. Soil blending is an effective treatment at the source. Soil blending delivers chemical oxidants, reductants, bio-amendments, and stabilizers into soils to breakdown hydrocarbons. In other words, soil mixing/blending refers to mixing chemical reagents (wet or dry) into contaminated soils and groundwater. It allows treatment of low permeability soils.
It is a green-friendly, lower cost alternative to hazardous waste landfilling. Additionally, it’s a quick remediation option that uses in-situ or ex-situ methods.
IN-SITU
SOIL BLENDING
This method is in-situ, meaning in-place, and utilizes conventional excavators with or without blending attachments or specialized auger driven equipment. Oxidants and/or amendments are mixed directly into unsaturated and saturated soils.
One advantage is that it treats both soil and groundwater simultaneously.
MODIFIED IN-SITU
SOIL BLENDING
A low-cost approach is to utilize a modified Large Diameter Auger (LDA) or bucket auger rig for deep soil mixing. This environmental remediation treatment is used when there is contamination that runs deeper than what traditional remediation methods can treat. Soils are removed and segregated for ex-situ treatment in a tub/roll-off using chemical oxidants, reductants, or bio-amendments. Then, soil can be returned to the borehole with chemical additives to stimulate long term bioremediation in groundwater.
EX-SITU
SOIL BLENDING
Ex -Situ, meaning above ground, is soil excavated utilizing a pug mill or similar equipment for chemical treatment prior to returning soils to the excavation site. Soils are removed and segregated for ex-situ treatment in a tub/rolloff using chemical oxidants, reductants, or bio-amendments. Typically, ex-situ methods offer maximum contact compared to in-situ methods. Some benefits to the ex-situ method are that soils can be stabilized after treatment for re-use and lower treatment thresholds can be achieved.
IN-SITU & EX-SITU CASE STUDIES
