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Landfill Cells

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The delivered MSW is compacted and sculptured by a Bomag compactor ... slanted cube built in realty. computer programs determine optimal cell dimensions ... – PowerPoint PPT presentation

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Title: Landfill Cells


1
Landfill Cells
  • What are landfill cells?
  • Fill plan?
  • Fill sequence?

2
Omarunui Landfill
  • Hastings, New Zealand
  • The delivered MSW is compacted and sculptured by
    a Bomag compactor weighing 26 tonnes
  • 2 m thick cells, 30 m working face helps control
    odor and wind blown litter
  • Each day waste covered with a layer of
    non-organic soil

3
Planning Package
  • Operation and fill sequence plans (hand-in-hand)
  • Operation plan addresses the daily operation of
    the site, landfills operation manual
  • Information provided in the operation plans- used
    to develop the fill sequence

4
Operation Plan
  • Compactor operations dictates cell
    construction, operator determines type of cell
    constructed, where and when the cell is ready for
    finishing and covering
  • Optimum density space saving, point of
    diminishing return, high capital and operation
    cost of compactor, cost/benefit

5
Landfill Cells
  • optimum cell geometry maximize volume minimize
    surface area (ideally a sphere)
  • slanted cube built in realty
  • computer programs determine optimal cell
    dimensions

6
Landfill Cells
  • Segregate garbage by type larger material at
    the bottom finer at the top, use temporary
    stockpile
  • Tasks hand-in-hand, dozer pushes the MSW to the
    compactor which builds cells, and finally
    scraper places soil for covering

7
Fill Plan
  • Two-step approach long term and short term
    goals
  • Long term goals identified first, where the
    site is headed in the long term
  • Short term detailed annual access plan,
    placement tipping pads and stock piles

8
Fill Plan
  • Fill methods depend on the specific site
    characteristics
  • Site characteristics available cover material,
    topography, local hydrology, geology, etc.
  • Detailed plan layout of individual cells,
    needed for gas and leachate control

9
Fill Sequence
  • Planning both long term and short term depends
    on 5 main areas of operation
  • Plan major fill and excavation phases, further
    subdivided, 1-2 yrs of liner at a time
  • Major cost vehicle access, drainage, soil
    transportation, closure should be established

10
Main Areas of Sequence Plan
  • Economics larger the project lower the unit
    price of construction, time value of money
    (delaying more costly phases)
  • Access roads ( high construction and
    maintenance cost), build sparingly and place
    where they will be useful for as long as possible

11
Main Areas of Sequence Plan
  • Drainage plan backwards (from final stage to
    present), ensure that there is proper and
    efficient drainage in every area to avoid eroding
    and weakening cells
  • Excavation minimize initial excavation, avoid
    double-handling of soil, move it fast
  • Filling enough capacity until next phase,
    determine minimum size of each phase then the
    most economical size, closure sequence

12
Landfill CellsBasic Building Blocks of Landfills
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