PARENT SESSION
Poster Session 23: Soil Ecology
Wednesday, August 10, 5:00 PM - 6:30 PM, Exhibit Hall 220 A-E, Level 2, Palais des congrès de Montréal
Ecological diagnosis on sediments of petrol eum wastewater irrigation channel.
Song, Yufang1, 1 Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning, China
ABSTRACT- Sediment samples were collected from several sites in the up, mid and download along the petroleum -wastewater irrigation channel, eastern Shenyang of China. Concentrations of Cu, Zn, Pb and Cd and mineral oil were analyzed. The eco-toxicity of sediments was evaluated. The results showed that pollutants have been accumulated in all of sediment samples with 408 mg.kg-1 to 11830 mg.kg-1 for mineral oil and 17.83 mg.kg-1 to 78.53 mg.kg-1 for Cu, 35.76 mg.kg-1 to 155.16 mg.kg-1 for Zn, 8.50 mg.kg-1 to 31.03 mg.kg-1 for Pb and 0.1 mg.kg-1 to 1.0 mg.kg-1 for Cd respectively. Sediments showed an inhibition or stimulation effect on root elongation of plant and a lethal and sub-lethal effect on earthworm. The inhibition rate of root elongation based on germination test was -29.81 % to 93.8%. The mortality rates of earworms at maximum were 100% during 14d exposure. The inhibition rates of body weight growth were -36.6% to -6.0 8% and -40.4% to 6.1% during 14d and 28d exposure. The study indicated that long-term of irrigation with petroleum wastewater resulted in the accumulation of pollutants in channel sediments and enhanced eco-toxicity.
Key words: Sediment, Eco-toxicity, Wastewater irrigation, Evaluation