Landfill Leachate Treatment

Electrocoagulation has been proven effective in the treatment of landfill leachate. The EPA has valid concerns about toxic leachable phosphates and metal build up in soils that may cause contamination of surface water and underlying aquifers as well as many waste sludges being deposited in hazardous waste landfills. .

The F&T EC treatment has demonstrated an ability to significantly reduce these risk factors. Electrocoagulation treatment achieves significant reductions in total phosphorus, the removal of Total Suspended Solids (TSS) and heavy metals. EC is also highly effective at the control of bacteria, including fecal coliforms, which is important to any municipal water processing facility.

The reality of the hazardous waste limits can be illustrated by acceptable disposal limits at non hazardous disposal facilities. In this example California can only accept waste for disposal with levels of metals below the following leachability listed limits:

Element Title 22/ STLC (mg/L) Title 22/ STLC
Antimony (Sb) 15.00 500
Arsenic (As) 5.00 500
Barium (Ba) 100.00 100.00
Beryllium (Be) 0.75 75
Cadmium (Cd) 1.00 100
Chromium (Cr) 560.00 2,500
Hexavalent (Cr+6) 5.00 500
Cobalt (Co) 80.00 8,000
Copper (Cu) 25.00 2,500
Lead (Ph) 5.00 1,000
Mercury (Hg) 0.20 20
Molybdenum (Mo) 350.00 3,500
Nickel (Ni) 20.00 2,000
Selenium (Se) 1.00 100
Silver (Ag) 5.00 500
Thallium (Tl) 7.00 700
Vanadium (V) 24.00 2,400
Zinc (Zn) 250.00 5,000

Electrocoagulation may soon move from the optional treatment method to the essential treatment method as the US EPA begins to enforce the laws protecting the environment from toxic wastes, including heavy metals. Electrocoagulation cleans most water streams better, with less operating cost, producing less sludge, with the sludge being a better quality than chemical precipitation. The reuse opportunities for the water is increased because dissolved solids are not added to the water stream; and usable products are harvested because the metal oxides pass the leachability tests, allowing the sludge to be utilized as a soil additive.

F&T Water Solutions has developed portable bench scale electrocoagulation units suitable to demonstrate the advantages of electrocoagulation at the treatment site. If you would like additional information, or a demonstration of the electrocoagulation process please contact F&T by phone at (561) 306-0605 or e-mail info@ftwatersolutions.com.