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DEVELOPMENT OF NEW BENTONITE ZEOLITE BASED PRODUCTS AND APPLICATIONS FOR ENVIRONMENTAL PROTECTION

Objective


Na-activated bentonites and natural zeolites, new organophilic bentonites, inorgano-organophilic bentonites, new synthetic zeolites produced from perlite fines and de-aluminized zeolites were developed and tested for their ability to retain toxic inorganic and organic compounds produced by human activities and frequently found in landfill sites. The experiments were carried out in both laboratory and pilot plant scale including prototype horizontal and vertical landfill barriers in both Germany and the U.K.

The experimental results showed that the new synthetic materials and modified natural products are capable of adsorbing almost all toxic compounds tested in both the laboratory and the pilot plant scale. These materials can be added in small amounts, both separately and in mixtures with each other, in the soil matrix in order to improve its retention capacity without increasing its permeability. It was also found that the formation of synthetic zeolites might be followed by synthesis of new high added value zeolite-A and zeolite-X, which could be used as detergents or/and molecular sieves. Finally it has been shown that environmental application of these materials, at least in the case of small projects, might be plausible, because it would not increase their cost.
The proposed project is aiming at the development of new high-added value products based on bentonite and zeolites for environmental protection applications. Three main fields of application of the newly developed products make up the goal of the project:

a)Waste deposit barriers (horizontal barriers against organic and inorganic toxic leachates from mining, metallurgical and municipal sanitary and hazardous waste deposits)

b) Trench wall slurry-technology (vertical barriers against orgnic and inorganic toxic leachates from contaminated industrial sites as well as already existing waste deposits which are not encapsulated according to modern technical standards)

c)Grouting technology (injection of the developed products into soil or rock skeletons in order to improve the imperviousness and retention properties against toxic agents).

The project will involve the following steps in gaining the research tasks: 1.Selection and characterisation of suitable bentonite, zeolite deposits. 2.Application of innovative treatment processes, in order to adjust or improve their selectivity in terms of inorganoorgano affinity using reactions with inorganic cations organic chain structures, etc. The development of new organophilic, inorgano-organo bentonites, new zeolites from perlite fines (not marketable "wastes") and modified natural zeolites is the aim of this research step. 3.Study of the complex physicochemical interactions of the new products with specific soil and rock environments 4.Field application in waste disposal barriers and slurry trench walls in the scale of test fields.

Successful completion of the project will result in the development of new products with enchanced value, as well as the in the development of novel hazardous tailings encapsulation/treatment technisques with a positive impacts on environmental protection.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

SILVER AND BARYTE ORES MINING CO
Address
Agias Annis Str. 23
18233 Rentis / Athens
Greece

Participants (5)

HERMANN STUMPP GmbH & CO
Germany
Address
Heimsheimer Straße 14
7000 Stuttgart
IBECO
Germany
Address
Ruhrorter Straße 72
68219 Mannheim
KNIGHT PIESOLD & PARTNERS
United Kingdom
Address
Kantach House, Station Road
TN23 1PP Ashford
UNIV ATHENS
Greece
Address
Heroon Polytechniou Street 9 Zografou
15780 Athens
Universität Fridericana Karlsruhe (Technische Hochschule)
Germany
Address
Kaiserstraße 12
76128 Karlsruhe