By McDonald, Chris; Meggyes, T.; Simon, Franz-Georg
This ebook incorporates a choice of the main updated learn on reactive limitations and pump-and-treat, with the main target on heavy steel elimination. After facing basic problems with groundwater remediation utilizing lively and passive approaches, remediation engineering perform is mentioned with an emphasis on heavy steel remediation, sorption kinetics ...
summary: This e-book encompasses a collection of the main updated study on reactive boundaries and pump-and-treat, with the main target on heavy steel removing. After facing basic problems with groundwater remediation utilizing energetic and passive approaches, remediation engineering perform is mentioned with an emphasis on heavy steel remediation, sorption kinetics
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Extra resources for Advanced groundwater remediation : active and passive technologies
Barrier installation costs amounted to US $200–250 per square metre, and gate installation costs were US $850–1000 per square metre. The Karlsruhe East gasworks site remediation is another example of the use of sheet piles: a funnel-and-gate system was constructed here to clean up PAH and benzene contamination (Schultze and Mussotter, 2001). The funnel is a 240 m long 46 ACTIVE AND PASSIVE PROCESSES 23 and 19 m deep steel sheet pile wall, which was pressed into the ground using a Silent Piler to avoid damage to nearby historic buildings.
Feasible depths are a few hundred metres, and frozen walls are effective in both clay and sand/gravel-type soils. Frozen walls may prove to be both an economically and environmentally sound technology. Advanced applications use monitoring by thermistors, electro-potential, etc. 44 ACTIVE AND PASSIVE PROCESSES 21 Gravel Panel (concrete) Aquifer Activated carbon Fig. 10. 2. , 1997; Beitinger, 1998): • • • • replaceability of the reactive materials (where appropriate); higher permeability than the surrounding reservoir; stability against fines washed into barriers from the surrounding soil; long life-span.
According to their results, the function of the walls could be impaired by the accumulation of iron hydroxides, carbonates and sulfides due to decreased permeability and reactivity. In reactions (6) and (8) OH– is the product, which also leads to an increase in pH in the PRBs (Puls, 1998). The rate of reaction is decreased at elevated pH values, and a linear dependency of the observed rate and pH was measured (Matheson and Tratnyek, 1994). , 1995; Sivavec, 1996). Other researchers (Johnson and Tratnyek, 1995) have discussed the precipitation products siderite (FeCO3), goethite (FeOOH) and ‘green rust’ (Fe2(OH)4Cl·nH2O), depending on the composition of the groundwater.