back    home

Lesson 4: MSW Landfills



Landfill Design



Collection System Design


Installation

 

Landfill Composite Leachate Collection
System Installation (Note: Clay, Geo-
membrane, Gravel, and Sand Materials)

Landfill Leachate Collection System
Installation (Note: Geo-
membrane and Drainage Material)

 

Welding Sheets of HDPE Geomembrane
for Landfill Liner

Booting Leachate Collection Pipes
to Landfill Liner



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


Page last updated August 2003 by Dr. Reinhart