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Phytoremediation of Aged Petroleum Sludge

Effect of Irrigation Techniques and Scheduling

^a Biological and Agricultural Engineering, Kansas State University, 147 Seaton Hall, Manhattan, KS 66506
^b Agronomy Department, Purdue Univ., 1150 Lily Hall of Life Sciences, West Lafayette, IN 47907-1150
^c Civil Engineering, Purdue Univ., 1284 Civil Engineering Building, West Lafayette, IN 47907

View larger version (37K): [in a new window]   Fig. 1. Design of the columns used in this experiment showing the location of tensiometers, irrigation ports, and the vacuum-driven leachate collection system.

View larger version (32K): [in a new window]   Fig. 2. Total aboveground biomass for column study reported for different irrigation methods: SurOpt = surface application with optimal (daily) application of water, SurCyc = surface application with a weekly irrigation cycle, SubOpt = subsurface application with optimal irrigation rate, and SubCyc = subsurface application with a weekly irrigation cycle.

View larger version (28K): [in a new window]   Fig. 3. Total root biomass for column study reported for different irrigation methods: SurOpt = surface application with optimal (daily) application of water, SurCyc = surface application with a weekly irrigation cycle, SubOpt = subsurface application with optimal irrigation rate, and SubCyc = subsurface application with a weekly irrigation cycle.

View larger version (18K): [in a new window]   Fig. 4. Reduction in total petroleum hydrocarbons (TPH) concentrations over the 7-mo experiment averaged over irrigation placement.