Test Methods for Determining the Chemical Waste Compatibility of Synthetic Liners

摘要

A search was made for test methods for the chemical resistance of membrane liners (geomembranes). Disclosed methods and procedures were examined and compared. Two tests being promoted for general acceptance are NSF Standard No. 54 (a voluntary industry-generated test) and the proposed EPA Test Method 9090. Several other tests developed by liner manufacturers and researchers were found, as well as those methods generally applied to pipes, bottles, film, plastics, rubber sheeting and the like. Although details of tests vary, all are laboratory tests in which selected physical properties of the membrane are compared and evaluated after contact with the liquid for specified periods of time. All are tedious, time-consuming, and potentially costly. Useful data for product specification and application are derived from these tests, but none adequately addresses all issues and questions raised, especially with regard to liner life-time prediction. Nor is any one test universally accepted for use. A combination of compatibility tests (e.g., immersion, stress-crack, and permeation) may be necessary to fully characterize chemical resistance in specific cases. A superior test (s) based on a comprehensive understanding of liner compatibility remains to be developed.