Date of Award
Master of Engineering (ME)
Civil Engineering and Engineering Mechanics
J. J. Emery
A standard solubility test can be used to assess the potential hazard associated with a wide variety of industrial wastes. This test will provide regulatory agencies with a more efficient tool with which to protect receiving waters and hence to establish environmental safeguards. Further, data generated by solubility testing will enable engineers to optimize disposal' site selection, criteria and design.
A comparison of nineteen leaching tests was performed to determine the features to be incorporated into an ideal solubility test. Most of the procedures reviewed were geared to the specific waste and method of disposal and few provided guidance on how to apply the test data to the field situation. From the comparison, the shake type procedure was found to be superior to column leaching. The attributes of an ideal solubility test incorporating shaking were identified.
Legislation, guidelines and objectives respecting disposal must be considered before an assessment is made of the inherent hazard in a waste. A review of these documents revealed that some requirements relate to effluents while other relate to receiving water quality. A comparison is made of the various criteria that require compliance for water quality in the U.S.A. and Canada (Ontario).
Developmental laboratory research into solubility testing was performed in the Construction Materials Laboratory at McMaster University. Background data and information are presented and the procedure adopted finally, the McMaster Modified Solubility Test (MMST), is outlined. The major features of this procedure include:
- The use of acidic and neutral leaching solutions
- Gentle but effective agitation technique
-Use of desorption isotherms to specify optimum leaching solution to waste proportions
-Use of batch kinetics to specify optimum shaking time
-A means of interpreting the data.
The MMST is performed with wastes whose physical and chemical nature warrants a detailed investigation into their solubility limits. These wastes include settling basin sludge from a chemical process, municipal incinerator residue, and raw and solidified industrial sludge. Some conclusions regarding leaching patterns are presented.
Matchett, David, "Potential Solubility of Waste Materials" (1982). Open Access Dissertations and Theses. Paper 2932.