Vergleich veschiedener Deponieoberflachenabdichtungssysteme unter dem Aspekt Emissionsminimierung und Rekultivierbarkeit

authored by

J. Bachmann, D. Von Felde

Abstract

Since 1991 the Institute for Sanitary Engineering and Wastemanagement and the Institute of Soil Science of the University of Hannover investigate the gaswater- and temperature regime of test fields located on a municipal waste landfill having different sealing systems. The results show that surface sealing reduced considerably the landfill gas concentration in the recultivation layer above the sealing, reduced soil temperatures in the root zone, and enlarged the depth of the root zone. Combined sealings (clay mineral barrier covered with a plastic liner) are the most efficient systems in order to prevent gas emissions and increase oxygen concentrations in the root zone. The gasproofness of mineral sealings without a plastic liner depends on temperature and water content of the soil. Especially in summer the landfill gas concentration in the soil increased. This effect is assumed to occur due to desiccation and shrinking of the clay. Simple layers of non-cohesive material cause gas capture rates below 50% and do not provide a satisfying protection against methane emissions from landfills. Protection of the recultivated soil layer with long term durable sealing systems are considered to be essential for successful recultivation of the landfill. Examination of the planted vegetation shows, that the recultivation of the testfields seems to be successful for the first six years. Right now, however, it cannot be determined the high technical and financial efforts for constructing combined sealing systems are justified for future landfills which will contain pretreated, inert wastes with low emission rates.

Organisation(s)

Institute of Soil Science
Section Soil Physics

Type

Article

Journal

Zeitschrift fur Kulturtechnik und Landentwicklung

Volume

39

Pages

220-227

No. of pages

8

ISSN

0934-666X

Publication date

09.1998

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Geography, Planning and Development, Water Science and Technology

Sustainable Development Goals

SDG 11 - Sustainable Cities and Communities