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Assessment of the Use of Industrial By-Products to Remediate a Copper- and Arsenic-Contaminated Soil

^a Rothamsted Research, Agriculture and the Environment Division, Harpenden, Hertfordshire, AL5 2JQ, UK
^b CSIRO Land and Water, PMB 2, Glen Osmond, SA 5064, Australia
^c University of Natural Resources and Applied Life Sciences, Institute of Soil Science, Gregor Mendel Strasse 33, A-1180 Vienna, Austria

View larger version (36K): [in a new window]   Fig. 1. Shoot dry biomass of lettuce and ryegrass, and As and Cu concentrations in dry shoots of plants grown in the untreated control soil and in the amended soils. Error bars represent ±SE of three replicates. RG, red gypsum; RM-H and RM-UK, red mud from Hungary and the United Kingdom, respectively; WTS, water treatment sludge.

View larger version (26K): [in a new window]   Fig. 2. Nitrogen mineralization measured after 7, 14, and 28 d in the untreated control soil and in the amended soils. Error bars represent ±SE of three replicates. RG, red gypsum; RM-H and RM-UK, red mud from Hungary and the United Kingdom, respectively; WTS, water treatment sludge.

View larger version (14K): [in a new window]   Fig. 3. Relationship between the ratio of labile pool of arsenic and copper obtained from the filtrates (E) and that obtained from the resin-purification step (Er), and pH of the soil suspensions. All replicate and treatment data are reported.

View larger version (19K): [in a new window]   Fig. 4. (a) Labile As pools and (b) As sorbed by the resin from the water extract (Er) as a function of soil pH and treatments. Arrows indicate the control treatment. Error bars represent ±SE of three replicates. RG, red gypsum; RM-H and RM-UK, red mud from Hungary and the United Kingdom, respectively; WTS, water treatment sludge.

View larger version (19K): [in a new window]   Fig. 5. (a) Labile Cu pools and (b) Cu sorbed by the resin from the water extract (Er) as a function of soil pH and treatments. Arrows indicate the control treatment. Error bars represent ±SE of three replicates. RG, red gypsum; RM-H and RM-UK, red mud from Hungary and the United Kingdom, respectively; WTS, water treatment sludge.