20 years performance measurements of a landfill cover system with components constructed from pre-treated dredged sediments.

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ID: 53382
2019
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Ranked #47 of 145 articles by views in waste management (new york, ny)

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Abstract
The water balance and effectiveness of a landfill cover containing a liner from fine-grained dredged material ('METHA-material') and a drainage layer from sandy dredged material ('METHA-sand') from the Port of Hamburg (Northern Germany) was investigated for 20 years using two test fields (lysimeters), each 500 m in size. The layering within the standard design test field (FS) is identical to the layering of the cover on the landfill, whereas the alternative design test field (FA) was designed to provoke desiccation of the liner. The setup abstained from continuous side walls cutting through the liners in order to allow for material properties representative for the landfill cover, at the cost of possible minor lateral inflows or outflows, which were, however, considered negligible. By example of the lysimeter FA the risk of desiccation-induced failure of a liner from METHA-material under the given climate could be shown. In contrast, the discharges and hydro-chemical parameters measured for the lysimeter FS indicate continuous high efficiency of the liner until today. The average discharge below the liner was 14.9 mm/yr. The entire cover contributes to the good liner performance. Reason are (1) the low hydraulic conductivity of the liner (5 × 10 m/s) and its large thickness (1.5 m); (2) the increased stresses on the liner due to the 2.5 m thick overlaying cover; (3) the 1.0 m thick drainage layer from slowly-draining METHA-sand, allowing for a continuous nearly water-saturated fringe above the liner; and (4) the sufficient amount of plant available water in the recultivation layer.
Reference Key
berger201920yearswaste Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Berger, Klaus;Groengroeft, Alexander;Gebert, Julia;
Journal waste management (new york, ny)
Year 2019
DOI
S0956-053X(19)30595-1
URL
Keywords
cover system desiccation dredged material lateral drainage layer liner leakage water balance

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