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Environment Engineering I

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Presentation on theme: "Environment Engineering I"— Presentation transcript:

1 Environment Engineering I
An- Najah National University Civil Engineering Department Environment Engineering I Chapter Twelve- section 2 Solid Waste Management Dr. Amal Hudhud Dr. Abdel Fattah Hasan

2 Method of Disposal

3 Combustion (1) To reduce waste volume, local governments or private operators can implement a controlled burning process called combustion or incineration Burning waste at extremely high temperatures also destroys chemical compounds and disease-causing bacteria.

4 Sanitary landfill (2) Before 1979 MSW disposal to open dump which result in bad impact to Environment and human health After 1978 open dumping of waste was banned and replaced by sanitary landfill

5 sanitary landfill Land disposal site employing an engineered method of disposing of SW on a land in a manner that minimizing environmental hazards by spreading solid waste to the smallest practical volume, applying and compacting cover material at the end of each day

6 sanitary landfill Site selection
Restricted location such as wetland flood plain, seismic impact areas Public opposition Proximity to roadways and bridge Location of GW table Soil condition and topography Availability of cover material

7 Sanitary landfill Operation
Area method the most common method in operation SLF it uses three step: spreading the waste, compacting and covering with soil The waste is spread in m layer and compacted

8 Sanitary landfill

9 Sanitary landfill Depths of Cover


11 Sanitary landfill Environmental consideration
Good compaction of waste, and daily covering with good covers are a must to control flies, rodents and fires

12 Sanitary landfill Leachate
Liquid that passes through the landfill, extract dissolved and suspended matter from waste material Liquid contains: decomposition of waste, rainfall, surface drainage and Groundwater

13 Sanitary landfill

14 Sanitary landfill Quantity of leachate

15 Sanitary landfill When the landfill reach its field capacity (the quantity of water held against gravity) leachate begin to flow Amount of leachate is determined by Darcy law


17 Sanitary landfill Control of leachate: landfill must be lined in a specific manner to meet maximum contaminate level for G.W Specific liner include synthetics membrane 0.76 mm thick (HDPE, PVC….)

18 Sanitary landfill

19 Sanitary landfill Leachate treatment
New landfill high concentration of Ammonia, organic chemical Old landfill high concentration of salts Treatment options: 1) directly to WWTP 2) pretreatment on site (flocculation- sedimentation –filtration) 3) treatment on site Activated sludge and Reverse Osmosis (RO)

20 Sanitary landfill Methane and other gases production: Emitted from a landfill as a result of microbial decomposition (CO2 and CH4)





25 Sanitary landfill Leachate monitoring Groundwater monitoring
Surface water monitoring To provide data that leachate is not infiltrating into groundwater to identify risk associated with improved operation of the landfill

26 Sanitary landfill Landfill Design
Site Preparation, building, monitoring wells, size, liners, leachate collection system, final cover, gas collection. Where = volume of landfill (in m3) P = population E = ratio of cover (soil) to compacted fill = = volume of solid waste ( in m3) = volume of cover ( in m3) C = average mass of solid waste collected per capita ( in Kg. person -1) Dc= density of compacted fill (in Kg. m-3)


28 Sanitary landfill Landfill closure
Final cover to be applied in order to prevent moisture from entering the closed landfill

29 Sanitary landfill issues that need to be considered in developing a landfill closure plan Landfill will be threaten for ever (heavy metals and salts) Liners integrity issues Leachate collection system Landfill cover GW monitoring Gas emission

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