Waste disposal options: land fills

Question 1

2 waste disposal options

Answer 1

land fill, DWI

Question 2

dump vs. sanitary land fill

Answer 2

dump: place for disposal of domestic waste

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

Question 3

Alberta regulations

Answer 3

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

Question 4

AB landfill classification

Answer 4

1. municipal
2. industrial
3. oilfield

Question 5

Municipal landfill classes

Answer 5

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

Question 6

Industrial LF classes

Answer 6

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

Question 7

Oilfield LF classes

Answer 7

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

Question 8

LF sitting 3 biggest issues

Answer 8

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

Question 9

Potential problems associated w/ LF

Answer 9

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

Question 10

Potential migration routes for pollutants

Answer 10

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

Question 11

Sanitary LF design classes

Answer 11

1. area fill

2. trench fill

Question 12

5 basic design components of a sanitary LF

Answer 12

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

Question 13

Types of liners

Answer 13

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

Question 14

options for disposal of leachate

Answer 14

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

Question 15

Requirements for covers and caps

Answer 15

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

Question 16

Two types of gas extraction systems

Answer 16

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

Question 17

LF monitoring plans

Answer 17

At minimum

1. GW monitoring plan
2. SW monitoring plan

if leachate collection system, must:

3. leachate monitoring program
4. Surface LF gas monitoring plan

Question 18

3 stages of wast decomp in a LF

Answer 18

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

Question 19

4 phases of LF life

Answer 19

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