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Paper Information

Journal:   JOURNAL OF HYDRAULICS   SUMMER 2005 , Volume 1 , Number 1; Page(s) 55 To 68.
 
Paper: 

SIMULATION OF NATURAL AND ENGINEERED HYDRAULIC TRAP SYSTEMS IN A LANDFILL, USING ONE- DIMENSIONAL THREE-LAYER LABORATORY MODELS

 
 
Author(s):  BADV K.*, ISA ZADEH B.
 
* CIVIL ENG. DEPT., URMIA UNIV., URMIA, IRAN
 
Abstract: 

The role of unsaturated drainage layer and hydraulic control systems in sanitary-engineered solid waste landfills were simulated using -three-layer one-dimensional laboratory models. In the models, from top to bottom, a sodium chloride solution as a contaminant source reservoir, a first compacted silt layer as a primary liner, a coarse sand layer as a secondary leachate collection system or a hydraulic control layer, a second compacted silt layer as a secondary liner, and a bottom water reservoir as a groundwater aquifer, were used. In the first two tests, the model simulated the secondary leachate collection system and natural hydraulic trap system (upward flow through the second clayey silt layer). In this case, the contaminant transport mechanisms through the first silt layer were downward advection and diffusion, and through the second silt layer, diffusion was downward and advection was upward. The results showed that the implementation of the natural hydraulic control system could effectively reduce the contaminant transport to the underlying groundwater reservoir. In the third test, the natural and engineered hydraulic trap systems were simulated (upward flow from the bottom reservoir to the upper reservoir). In the fourth test, the model simulated the engineered hydraulic trap system (downward flow through the first silt layer and upward flow through the second silt layer). The results showed that natural and engineered hydraulic trap systems have important effects on reducing the contaminant transport toward the underlying aquifer. In all experiments the chloride concentration in silt and coarse sand layers and top and bottom reservoirs were measured and the observed concentrations were compared with theoretical concentrations calculated by computer code POLLUTE V6. The results showed that there is good agreement between theoretical and observed data.

 
Keyword(s): CONTAMINANT TRANSPORT, LANDFILL, DIFFUSION, ADVECTION, NATURAL AND ENGINEERED HYDRAULIC TRAP
 
References: 
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