Patent · US Expired

Impervious layer formation process and landfill adsorption system

US4908129A · kind A · utility

51Cited by

21References

17Claims

0Family size

Assignee

Dyckerhoff & Widmann Aktiengesellschaft · DE

Inventors

Klemens Finsterwalder · Mörlbach, DE
Jurgen Spirres · Ratingen, DE

Key dates

Filing date	May 23, 1988
Grant date	Mar 13, 1990
Priority date	—
Expiry date	May 23, 2008

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE02D31/004
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

An arrangement for retaining harmful substances contained in water seeping from a waste dumping ground body includes an impervious layer of mineral sealing materials, such as clay, with an adjacent adsorption layer containing materials capable of binding harmful substances by physical and/or chemical adsorption. The materials may be in the form of admixtures. When seepage water flows very slowly through a layer of mineral sealing materials, it is possible to remove and retain the harmful substances. The permeability of the arrangement reduces with time due to the adsorption process with its sealing effect improving over geological time periods.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.