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CHAPTER 8: Landfill :mountain:, NOR KHAIRANI BINTI M MORDANI …
CHAPTER 8: Landfill :mountain:
Definition
landfill
engineered site where waste isolated from environment below the ground or on top until it safe degraded biologically, chemically and physically.
Differences
Landfill
carefully designed
monitored structure
isolates trash from surrounding environment
Dump site
open hole one the ground
trash is buried
no environment protection
Advantages and disadvantages
Advantages
can be reclaimed and used as new land
Organic material separated and used for composting
Produce energy and product
Methane
composting material
Disadvantages
Area surrounding heavily polluted
Insect and rodents causes disease
Problem aces when poorly design or operate
Type, classification and method
Type of landfill
Industrial waste landfill
Municipal landfill
Secure landfill
Sanitary landfill
Construction and demolition landfill
Classification
Class 2: solid non hazardous waste only
Class 3: inert waste only
Class 1: Solid hazardous waste only
Method
Slope method
In hilly region where not possible to find flat ground
waste placed along the side
Control of inflowing water from hill side slopes is a critical factor in design of such landfill
Depression method
Natural and artificial depression exist & use for land filling
depends on
Geometry of the site
Hydrology
geology of the site
access of the site
water does not accumulate behind the landfill
Ramp method
used in flat or slightly undulating areas
Area method
use flat ground
Before actual land filling, earthen levee is constructed
waste placed in thin layers and compacted
Used to disposed large amount of solid waste
Trench method
adequate cover material is available at site
water table is well below the surface
waste placed in trench and compacted in thin layer
After layer compacted height reached highest, cover material placed over compacted layer
Design consideration
Development of operational plan
Bottom and side liner system
Landfill capacity and life
Cover system
Infrastructure facilities
Leachate collection and management
Gas collection and management
Surface water drainage
Slope stability
Closure plan
Environmental Quality monitoring
Post closure maintenance
Operation and management
Step
waste compacting process
waste dumping process
Daily soil cover
waste weighbridge
capping/ covering process
Waste collection
Type of covering operation
Daily operation
Intermediate operation
Final covering operation
Leachate management
Process
Chemical oxidation of waste materials
Dissolving and leaching of organic and inorganic by water and leachate moving through the fills
Biological decay of organic materials, either aerobically or anaerobically with the evolution of gases and liquid
Movement of dissolved material by concentration gradients and osmosis
biological, physical and chemical events occur
Depends on
Landfill ages
most of the parameters examined in the leachate samples found higher in the fresh leachate than aged leachate
Type of waste contain in landfill
Hazardous
Non hazardous
NOR KHAIRANI BINTI M MORDANI 2016249836