Lesson 4: MSW Landfills
Landfill Design
Collection System Design
- Liner selection
- Single
- Composite
- Double
- Geocomposite liner
- Leachate flow rate (HELP)
- Leachate Collection System Design (Chapter 4 pp 136-138)
- Pipe spacing
- Leachate flow rate
- Pipe diameter
Installation
|
Landfill Composite Leachate Collection |
Landfill Leachate Collection System |
|
|
|
|
Welding Sheets of HDPE Geomembrane |
Booting Leachate Collection Pipes |
|
|
|
Leachate Treatment/Disposal
|
Treatment
Option |
Removal Objective |
Comments |
|
Biological
|
BOD/COD |
Best
used on "young" leachate |
|
Activated Sludge |
|
Flexible,
shock resistant, proven, minimum SRT increases with increasing organic
strength, > 90% BOD removal possible |
|
Aerated Lagoons |
|
Good
application to small flows, > 90% BOD removal possible |
|
Anaerobic |
|
Aerobic
polishing necessary to achieve high quality effluent |
|
Powdered Activated
Carbon/Act. Sludge |
|
>
95 % COD removal, > 99 % BOD removal |
|
Physical/Chemical |
|
Useful
as polishing step or for treatment of "old" leachate |
|
Coagulation/Precipitation |
Heavy
Metals |
High
removal of Fe, Zn; moderate removal of Cr, Cu, Mn; little removal of Cd, Pb,
Ni |
|
Chemical Oxidation |
COD |
Raw
leachate treatment requires high chemical dosages, better used as polishing
step |
|
Ion Exchange |
COD |
10-70%
COD removal, slight metal removal |
|
Adsorption |
BOD/COD |
30-70%
COD removal after biological or chemical treatment |
|
Reverse Osmosis |
TDS |
90-96
% TDS removal |
Gas Collection System
- Calculate annual gas production (peak) using LandGEM
- Pick type of system (passive, active, vertical, horizontal, combination)
- Layout wells
- Size blowers
- Calculate condensate
- Prepare gas monitoring plan
- NSPS calculations using default values
Page last updated August 2003 by Dr. Reinhart