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Characterization of Selenate Removal from Drainage Water Using Rice Straw

Yiqiang Zhang and William T. Frankenberger, Jr.*

Department of Environmental Sciences, Univ. of California, Riverside, CA 92521-0424



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  		Fig. 1. A flow diagram characterizing Se(VI) removal from drainage water.

 


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  		Fig. 2. Changes in the concentration of total soluble Se in the drainage water during 10 d of the experiments with different parts (lower stem, upper stem and leaf, and panicle) of nonsterile rice straw. Batch 1 experiments.

 


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  		Fig. 3. Total soluble Se in the sterile rice straw solution during 14 d of incubation, along with Se species at Day 14. Batch 3 experiments.

 


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  		Fig. 4. Changes in the concentration of Se species, pH, and redox potential (Eh) of drainage water during 14 d of incubation with nonsterile rice straw. Selenium concentrations are given for the rice straw solution with the exception of total Se(0), which was determined as the difference between added Se(VI) and total soluble Se in the entire water and rice-straw system. Symbols {diamondsuit}, {blacktriangleup}, and • show triplicate experiments. Batch 3 experiments.

 




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