Waste disposal options: land fills Flashcards Preview

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Flashcards in Waste disposal options: land fills Deck (19)
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1
Q

2 waste disposal options

A

land fill, DWI

2
Q

dump vs. sanitary land fill

A

dump: place for disposal of domestic waste

sanitary landfill: engineered, waste compacted and covered w/ soil

3
Q

Alberta regulations

A
  1. AEPEA
  2. WCR – class 1 for HW
  3. STD for landfills AB: provide the minimum requirements for development, operation, monitoring, closure
  4. evt code of practice: volume restrictions
4
Q

AB landfill classification

A
  1. municipal
  2. industrial
  3. oilfield
5
Q

Municipal landfill classes

A
  1. modified sanitary LF < 10000 peeps
  2. regional sanitary LF > 10000 – assoc. with large urban areas
  3. dry waste site: demolition material etc..
6
Q

Industrial LF classes

A
  1. Class 1 – HW, no municipal EQ
  2. class 2 – non-HW, modified regional
  3. class 3 – inert waste, municipal dry waste site
7
Q

Oilfield LF classes

A
  1. class 1a/class 1b
  2. class 2 – NHW, 1 liner, leachate system
  3. class 3 – asphalt
8
Q

LF sitting 3 biggest issues

A
  1. political/social nimby
  2. economic – want 25 + years of operation
  3. environmental/technical
9
Q

Potential problems associated w/ LF

A
  1. fires/explosions
  2. leachate
  3. odours
  4. windblown debris
  5. pests
10
Q

Potential migration routes for pollutants

A
  1. solution to ground water
  2. soil retention
  3. volatilization
  4. overland runoff
  5. plants
11
Q

Sanitary LF design classes

A
  1. area fill

2. trench fill

12
Q

5 basic design components of a sanitary LF

A
  1. liners
  2. leachate collection sys
  3. caps and covers
  4. gas extraction system
  5. GW monitoring well
13
Q

Types of liners

A
  1. Clay liners – can crack when dry
  2. synthetic liners – punctures/holes
    a) PVC
    b) HDPE
  3. combination liner
14
Q

options for disposal of leachate

A
  1. ww treatment plant
  2. land application
  3. leachate recirculation
  4. chem and phys treatment of leachate
15
Q

Requirements for covers and caps

A
  1. bottom layer 0.6 m of barrier layer, clay or geo
  2. middle layer w/ 0.35-0.8 m of subsoil
  3. top layer 0.2 m of topsoil
16
Q

Two types of gas extraction systems

A
  1. Active systems – perimeter GE trenches/wells - area of influence
  2. passive system – perimeter interceptor trenches, flaring, slurry walls
17
Q

LF monitoring plans

A

At minimum

  1. GW monitoring plan
  2. SW monitoring plan

if leachate collection system, must:

  1. leachate monitoring program
  2. Surface LF gas monitoring plan
18
Q

3 stages of wast decomp in a LF

A

stage 1: aerobic decomp – approx. 1 month, fire hazard
stage 2: fermentation – several years (acid leachate, high BOD, NH4, heavy metals
stage 3: methanogenesis – several decades, produces CH4. assoc. w/ methanogenic bacteria

19
Q

4 phases of LF life

A
  1. Active phase
  2. closure phase – reclaiming the site
  3. post closure phase – minimum of 25 yrs or after stds are met
  4. eternity phase – end use ie. golf course