Page 42 - DPR Rishikesh Legacy_Neat

mm screen is used for separation. If, however, the reclaimed soil is sold as
construction fill or for another end use requiring fill material with a high fraction of soil
content, a smaller mesh screen is used to remove small pieces of metal, plastic,
glass, and paper. Operation costs can be retrieved by the sale or reuse of the
recovered materials such as recyclables, soil, and waste. The recovered land may
also be monetized to recover costs of remediation. Further use of recovered land is to
be carefully considered after assessing the nature and impact of any site
contamination (soil or hydrological) due to the reclaimed dumpsite. In many cases,
such sites may be found suitable only for the construction of engineered sanitary
landfills for MSW or hazardous solid waste.

4.2.4 RECOVERY OF MATERIAL OR LAND
Biomining is a process whereby solid wastes which have previously been landfilled
are excavated and processed typically from an active or closed landfill, in order to
achieve environmental, economic or social benefits. In continuation of the excavation,
recycling of materials from landfills can be segregated.

Material recovery depends on the composition of waste, effectiveness of mining
technology, and efficiency of mining technology. The material recovery ranges from
50% to 90%, while average soil fraction in recovered municipal waste from landfill
tends to be around 50%–60%. However, it can vary between 20% and 80%
depending on moisture content and decomposition rate. The success of dumpsite
reclamation projects depends on the age of the dumpsite and composition of the
decomposed waste.
Dumpsites which are subjected to repeated burning, spontaneous or not, will have
minimal potential for reclamation and recovery of material. Unless the recovered
organic material is proved to be free from contamination (items indicated in Fertilizer
Control Order [FCO], 2009 and 2013), it should not be used as manure for food
crops.

Processing of the excavated waste can be done:
 On the spot

 In new constructed cells

 Moved and transported to another landfill

 Incinerated to produce heat and energy
 Use of compost after analysis

 Use of inert in low lying areas or as liner in scientific landfill cells

After mining or recycling the landfill the area can be used for different purposes.
Landfilling new waste, commercial and recreative purposes or back to its natural
status.

42