Geosyntec Staff Member Co-Authors Waste Management Article on Impact of Landfill Liner Time-Temperature
AUSTIN, Texas — Geosyntec Consultants is pleased to announce that Zahirul Islam, PhD, PEng, co-authored the Waste Management article, "Impact of Landfill Liner Time-Temperature History on the Service Life of HDPE Geomembranes," which was published in the October 2009 issue.
In the article, Zahirul and his co-author, Professor Kerry Rowe of the GeoEngineering Centre at Queen's University in Kingston, Ontario, Canada, estimated the service life of different HDPE geomembranes based on a number of idealized time-temperature histories for geomembrane liners used in municipal solid waste landfills. The predicted antioxidant depletion times (Stage I) were between seven and 750 years with the large variation depending on the specific HDPE geomembrane product, exposure conditions, and most importantly, the magnitude and duration of the peak liner temperature. They illustrate that the higher end of the range corresponds to data from geomembranes aged in simulated landfill liner tests and a maximum liner temperature of 37oC. The lower end of the range corresponds to a testing condition where geomembranes were immersed in a synthetic leachate and a maximum liner temperature of 60oC. The total service life of the geomembranes was estimated to be between 20 and 3,300 years depending on the time-temperature history examined. According to Zahirul and Prof. Rowe, the range in service life illustrates the important role that time-temperature history could play on the service life of HDPE geomembranes.
Zahirul earned his PhD in civil engineering from Queen's University. In addition, he received his Master's degree in civil engineering from the University of Western Ontario and Bachelor's degree in civil engineering from Bangladesh University of Engineering and Technology, Dhaka, Bangladesh. This article was part of his research work while pursuing his doctoral degree at Queen's University under the supervision of Prof. Rowe.