Because the landfill operation is to backfill the space with waste (and soil cover) from the bottom, the most important facilities, such as leachate collection pipes and gas venting pipes, will be buried under waste when the first layer is filled up.
Why do they cover a landfill with soil?
At the end of each working period, waste is covered with six to twelve inches of soil or other approved material. Daily cover reduces odors, keeps litter from scattering and helps deter scavengers. As waste arrives, it is compacted in layers within a small area to reduce the volume consumed within the landfill.
What is the purpose of laying a liner in a landfill?
Landfill liners are specially designed and crafted for that purpose to avoid certain liquids from garbage and waste from seeping further into the soil to contaminate groundwater and the surrounding environment.
What is used to cover waste in a landfill?
Daily cover for landfill is the soil material that is used to cover compacted solid waste in a sanitary landfill. The soil material is obtained offsite, transported to the landfill, and spread over the waste.
What are the major functions of landfill covers?
Final cover systems are used at landfills and other types of waste disposal sites to control moisture and percolation, promote surface water runoff, minimize erosion, prevent direct exposure to the waste, control gas emissions and odors, prevent occurrence of disease vectors and other nuisances, and meet aesthetic and …
What is the importance of liner and final cover?
The final cover functions as a way to keep the water out of the contaminate and to control the runoff from entering the system. This helps prevent plants and animals from being harmed by the waste contaminated water, leachate.
Bottom Liner System
A landfill’s major purpose and one of its biggest challenges is to contain the trash so that the trash doesn’t cause problems in the environment. The bottom liner prevents the trash from coming in contact with the outside soil, particularly the groundwater.
Why a landfill site must be lined before dumping waste on it?
A landfill is an engineered pit, in which layers of solid waste are filled, compacted and covered for final disposal. It is lined at the bottom to prevent groundwater pollution.
What is the purpose of daily cover?
Daily cover reduces odor, pest attraction, and fire hazard, and prevents blowing litter and dust.
Why must the groundwater in the areas surrounding the landfill be monitored?
Testing groundwater may reveal the potential source of contamination, for instance a leaking underground storage tank, a ruptured pipe or fractured well casing. Testing can determine if groundwater constituents are above or below federal safe drinking water standards.
Which layer of landfill has leachate collection pipe?
In double-liner systems, the upper drainage layer is the leachate collection system, and the lower drainage layer is the leak detection system. The leak detection layer contains a second set of drainage pipes. The presence of leachate in these pipes serves to alert landfill management if the primary liner has a leak.
What happens to waste in landfill?
When rubbish is disposed of in landfills, it is segregated into different types, rolled over and compacted into a pile. The waste is lined with clay before another pile is added to it. Moreover, the bottom and sides of the waste pile are lined to prevent contamination of ground water.