Processes of Decomposition of Refuse in Landfills

Geomorphic Processes

Landfilled material will gradually change in form and will exhibit different engineering and physical properties as a result of various environmental factors. Witmer and coworkers 7,8 reported the garbage decomposition process for a 10-year period as reflected on a particle size distribution curve. The aging process from fresh trash to aged trash along with the environmental and mechanical factors are illustrated in Figure 1. Mechanical processes do not directly contribute to the decomposition...

Lime Types Uses Composition And Treatment

Lime Schematic Diagram

Acidic industrial wastewater can be neutralized with slaked lime Ca(OH)2 , caustic soda (NaOH), or soda ash (Na2C03). Since slaked lime is less expensive than other bases, it is the most commonly used chemical for acidic neutralization 5 . Two types of commercial lime with their associated hydrates are high calcium quicklime, otherwise known as calcium oxide (CaO), and dolomitic quicklime (CaO and MgO). The composition of these will depend on the source of the parent limestone and the method of...

Multiple Extraction Procedure

Late Decelerations

The standard extraction tests (TCLP or California STLC) provide a one-time equilibrium solubility value of the heavy metal compounds in the extraction fluid but do not give an indication of the time-dependent stability of the residual matrix. The EPA multiple extraction procedure, designed for evaluating the leachability of materials exposed to so-called acid rain conditions, was used to test the stability of the polysilicate cementitious treatment protocol. Table 3 Effect of Particle Size on...