ABSTRACT
The use of disposal as a remedial alternative for hazardous waste is one of the common techniques implemented in practice. Land disposal, including landfills, deep-well injection, surface impoundments, and land farming, accommodate https://www.w3.org/1998/Math/MathML"> 12.3 % https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429080050/6559e41b-64b9-4256-96a3-5980cbb6d757/content/eq192.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> of the total amount of hazardous waste reported by Resource Conservation and Recovery Act (RCRA) large-quantity generators (LQGs). As of 1995, the amount of hazardous waste reported by LQGs was of the order of 214 million tons (1). Approximately 1 million tons of this waste was landfilled (1). RCRA prohibits the disposal of hazardous waste-containing free liquids in hazardous waste landfills. Free liquids are defined as those that readily separate from the solid portion of waste under ambient temperature and pressure ( 40 CFR $260.10). A typical breakdown of the constituents forming "hazardous waste" is shown in Fig. 1 .
