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Effects of oil shale-related effluents on some benthic freshwater organisms

Technical Report ·
OSTI ID:6796622
Laboratory scale model streams were developed to assess the effects of oil shale-related effluents on lotic freshwater aufwuchs and caddisfly larvae. A major impact of oil shale development in the headwaters of the Colorado River System may be on aquatic organisms in small streams. Colonization and development of aufwuchs were monitored over the course of the 9-day experimental runs. Model stream design allowed variation of water temperature, chemical composition, flow rate and illumination intensity and periodicity. Chemical constancy of the stream water was provided by continuously metering new water to the streams with doses of test effluents. Experimental runs tested Omega-9 water (groundwater diluted, in situ retort water) at dilutions between 0.013% and 2.12%; Unfiltered Omega-9 water at dilutions between 0.27% and 1.06%; 150 ton retort water (retort water from an above-ground, in situ simulator) at dilutions between 0.084% and 0.67%; and ammonium carbonate solutions of 0.56 mM to 4.52 mM. The aufwuchs' response to the effluents was monitored macroscopically, microscopically, and through measurement of biomass, ATP, chlorophyll a, respiration rate and photosynthetic rate. Readily measurable effects in the aufwuchs was produced by exposure to Omega-9 water and Unfiltered Omega-9 water at 1% and higher and 150 ton retort water at 0.34% and higher. High effluent concentrations reduced the percentage of diatoms in the aufwuchs population, increased heterotrophy and promoted sloughing of the aufwuchs mat. Very dilute effluent exposure stimulated aufwuchs productivity. Larvae of the caddisfly Gumaga nigracula were not measurably affected by the Omega-9 water and Unfiltered Omega-9 water concentrations tested, nor by the ammonium carbonate solution. Larvae of the caddisfly Dicosmoecus gilvipes were noticeably affected by concentrations of ammonium carbonate greater than 2mM.
Research Organization:
California Univ., Berkeley (USA). Lawrence Berkeley Lab.
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
6796622
Report Number(s):
LBL-9818
Country of Publication:
United States
Language:
English

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