Microtox bioassay of foundry sand residuals. (Water Quality and Treatment 02:00 PM, Saturday, April 5, 2003 Brewer/Frost Science 138 Dr. Yung-Tse Hung-Presiding).

Hung, Yung-Tse ; Jiang, Zhiguo ; Lo, Howard H. 等

3:45

The purpose of this paper is to describe the application of a bioassay in assessing the toxicity of foundry sand residuals. The objective was to determine whether Microtox method can be used effectively in determining the toxicity of foundry sand residuals. Microtox bioassays were performed on leachates derived from foundry sand residuals. Virgin sand samples were used to establish a benchmark against which the waste foundry sands could then be compared with respect to toxicity, pH and COD (chemical oxygen demand) were determined for the leachates. The pH was about 6.9 for leachate from virgin sand. The pH was from 6.5 to 10.1 for leachate from iron greensand foundry residual. For chemically bound waste foundry residual leachate the pH was from 6.8 to 7.3. The soluble COD for virgin sand leachate was from 2 to 24 mg/L. The soluble COD for foundry sand leachate ranged from 25 to 210 mg/L. The nature of pollutants were mainly organic in nature. The results indicated a correlation between higher levels of bioassay inhibition and leachate soluble COD. The pH in the leachate was higher than that from virgin sand and it may cause bioassay inhibition at the high pH values.

YUNG-TSE HUNG Y.HUNG@CSUOHIO.EDU AND ZHIGUO JIANG Z.JIANG1@CSUOHIO.EDU, CIVIL AND ENVIRONMENTAL ENGINEERING DEPT, HOWARD H. LO H.LO@CSUOHIO.EDU, DEPT OF BIOLOGICAL GEOLOGICAL AND ENVIRONMENTAL SCIENCES, CLEVELAND STATE UNIVERSITY, CLEVELAND OH 44115-2214