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FLEX: AN EXPERT SYSTEM FOR REVIEWING THE CHEMICAL RESISTANCE OF FLEXIBLE MEMBRANE LINERS FOR WASTE MANAGEMENT
Citation:
Landreth, R. FLEX: AN EXPERT SYSTEM FOR REVIEWING THE CHEMICAL RESISTANCE OF FLEXIBLE MEMBRANE LINERS FOR WASTE MANAGEMENT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/201 (NTIS PB93106706).
Description:
A computerized, expert system (FLEX) has been developed that will assess the chemical resistance of flexible membrane liners (FML) used at waste management facilities. hese FML's must be chemically resistant to the waste, its leachates, or both. o demonstrate chemical resistancy, the United States Environmental Protection Agency (USEPA) requires the use of Method 9090, wherein the physical properties of the FML are evaluated after various exposure times. fter the Method 9090 data are assembled, a reviewer is then responsible for assessing the data and reaching a conclusion about the probability that a proposed FML material will be resistant to the waste/leachate. nowledgeable judgments as to the chemical resistance of FML require a multitude of considerations--considerations whose interrelationships can only be understood, if at all, by persons having a combination of theoretical and practical experience in chemistry, polymer science, waste site construction, etc. ecause such knowledge is not generally available within the USEPA, a computerized, expert system was sought to provide guidance in the review of Method 9090 data. everal FML experts were interviewed to capture the thought processes they used when assessing the chemical resistance of liner materials. he liner materials of interest were high-density polyethylene (HDPE), polyvinyl chloride (PVC), and chorosulphonated polyethylene (CSPE).