Drip Irrigation Aided Phytoremediation for Removal of TCE from Groundwater Page: 3 of 9
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Figure 1. Conceptual design of drip irrigation/phytoremediation process
was conducted in two phases. Phase 1 involved setup and evaluation of the system while
Phase 2 involved process development and proof of principal experimentation.
MATERIALS AND METHODS
Description of Drip System. Drip irrigation lines were installed in four 0.24 ha
test blocks above the TCE-contaminated groundwater in D-Area. Each test block
consisted of three adjacent 0.08 ha test plots that were randomly assigned to receive one
of three treatments: Pine, cottonwoods or no vegetation. The plots were prepared by
removing all vegetation in two of the plots and all vegetation except mature pine trees in
the third plot. One of the two completely cleared plots in each block served as non-
vegetated control and the other was planted with cottonwood trees in the spring of 2001.
Each treatment plot was 28.7 m X 28.7 m. Although each entire plot was plumbed for
irrigation, sampling was restricted to the interior 20.1 m X 20.1 m (0.04 ha) region, thus
providing an 8.5 m buffer zone along the exterior portion of each plot. The irrigation
design for each plot consisted of 23 irrigation feed lines spaced 1.2 m apart and running
the entire distance of the plot. During Phase 1, water was pumped from a monitoring
well to a 9464 liter stainless steel holding tank. The water was then pumped, at timed
intervals from the tank to the irrigation system of the plots via a 2.54 cm diameter
manifold line. Irrigation feed lines branched from the manifold line. Each feed line was
attached to a drip line consisting of emitters spaced at 0.6m intervals. The emitter lines
were buried approximately 5 cm below the surface. There were four connections between
each feed line and emitter line and these were equipped with pulsators, which helped
regulate flow among emitters. During Phase 1, flow was restricted to a maximum of 488
1 per day to only four of the 12 plots because of limitations on the single well in
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Wilde, E.W. Drip Irrigation Aided Phytoremediation for Removal of TCE from Groundwater, article, April 24, 2003; South Carolina. (digital.library.unt.edu/ark:/67531/metadc740791/m1/3/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.