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Waste Management & Research, Vol. 15, No. 6, 593-605 (1997)
DOI: 10.1177/0734242X9701500605

Waste Minimization and Re-Use of Paper Sludges in Landfill Covers: a Case Study

Horace K. Moo-Young, Jr

Lehigh University, Bethlehem, PA 18015, U S. A.

Thomas F. Zimmie

Rensselaer Polytechnic Institute, Troy, NY 12180, US.A.

This investigation attempted to find a beneficial use for waste water paper mill sludges by using paper mill sludges as the impermeable barrier in landfill covers. This study investigated the geotechnical properties of seven paper mill sludges for use as the impermeable barrier in landfill covers. Paper mill sludges have a high water content and a high degree of compressibility and behave like a highly organic soil. Consolidation tests reveal a large reduction in void ratio and high strain values that result from the high compressibility. Laboratory permeability tests were conducted on in situ samples, and these samples met the regulatory requirement for the permeability of a landfill cover To determine the effectiveness of paper sludge as an impermeable barrier layer, test pads were constructed to simulate a typical landfill cover with paper sludge and clay as the impermeable barrier and were monitored for infiltration rates for 5 years. Long-term permeability values estimated from the leachate generation rates of the test indicate that paper sludge provides an acceptable hydraulic barrier. © 1997 ISWA

Key Words: Waste minimization • re-use • paper sludge • landfill • impermeable barrier permeability.


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