The approach taken to meet the project objectives was the characterisation of different reactive materials and relevant attenuation processes in the reactive 
matrix of the permeable barrier with special respect to their long-term behavior. The experimental work included laboratory experiments at different scales, 
going from bench-scale tests up to pilot-scale, and field-scale experiments. Experimental conditions were predetermined by the characteristics of the 
model site, such as geologic and hydrogeological settings, soil composition, and type, extent and spreading of the contamination. Technological methods 
to enhance the long-term efficacy and cost-effectiveness of permeable reactive barrier systems were developed and tested under realistic conditionsThe 
primary PEREBAR model site is an area in southern Hungary contaminated by uranium mining - thus including a region which is due to become part of the European 
Union. 
            

The overall objective of the PEREBAR project was to evaluate and enhance the long-term performance of permeable reactive barrier systems, with focus on systems 
based on sorption and precipitation of heavy metals and sorption and decomposition of organic compounds, respectively. Processes that impaired the barrier 
performance during barrier lifetime were studied qualitatively and quantitatively.    
The major steps of the projects were:     
•	Selection and characterisation of suitable reactive matrix materials (e.g., zero-valent iron, natural or organophilic zeolites, oxides, phosphates, 
lime, Mg hydroxide)     
•	Characterisation of relevant attenuation processes     
•	Development of contaminant-binding chemical compounds ('ligands')     
•	Accelerated testing methods to assess the long-term performance of the attenuation mechanisms in PRBs     
•	Development of a scheme to predict the long-term behaviour of PRBs     
•	Evaluation of the influence of site characteristics on PRB performance     
•	Monitoring of existing and new field installations     
•	Inclusion of electrokinetic techniques to PRB systems     
•	Field tests 
            

The overall objective of the PEREBAR project was to evaluate and enhance the long-term performance of permeable reactive barrier systems, with focus on systems 
based on sorption and precipitation of heavy metals and sorption and decomposition of organic compounds, respectively. Processes that impaired the barrier 
performance during barrier lifetime were studied qualitatively and quantitatively.    
    
The available products are:    
    
•	Site Characterisation: Former Uranium Mining and Processing Site near Pécs, Hungary, and AR&B System, Brunn a. G., Austria (Report)    
    
•	Reactive Materials and Attenuation Processes for Permeable Reactive Barriers (Report)    
    
•	Properties of Reactive Materials suitable for use in Permeable Reactive Barriers (Report)    
    
•	Test Apparatus for Accelerated Testing of Permeable Reactive Material (Report)    
    
•	PANSIL - A new material designed to sequester uranium (VI) from contaminated groundwater (Report)    
    
•	Metal-sequestering ligand based media for treating contaminated groundwater using porous sequestration barriers (Report)    
    
•	Publications: A list of publications produced by the PEREBAR project  (Report)    
    
•	'Long-term Performance of Permeable Reactive Barriers', a book containing all major results of the project, was published in 2004 by Elsevier