Gang Chen, Ph.D., P.E.


Aerobic microbial species culturing:

Anaerobic microbial species culturing:

Batch experiments:

In the absence of leachate

In the presence of leachate

Column experiments:

Tag Meeting 1


2007 Update

Update of 2007a

Impact of Landfill Leachate on Iron Release from Northwest Florida Iron Rich Soil

Sponsored by the Hinkley Center for Solid and Hazardous Waste Management.

Duration: August, 2006 to July, 2007.

Project Information

In Northwest Florida, landfill leachate is being blamed for elevated levels of iron and arsenic, especially iron observations in the groundwater from monitoring wells downgradient of landfills. Landfills to be blamed for iron release in these regions include municipal landfills, industrial landfills, superfund landfills and C&D landfills.


This research will explore the geochemical and geomicrobiological processes during which iron reduction/oxidation occurs.  We expect to elucidate the dominating mechanism that is responsible for iron release in iron rich soils, especially in the iron rich soils that interact with landfill leachate.  Our long-term goal is to derive the relationship of iron reduction/oxidation processes with the hydrogeochemistry and geomicrobiology (e.g., pH, redox and microbial activity or degradation processes) of the iron rich soils and to develop modeling tools to predict and monitor the iron reduction/oxidation and release processes. 

Central Landfill at Walton County

Proposed Mechanism:

In the absence of leachate:

In the presence of leachate:

Available data do not support chemical process:

Experimental Protocols: Mechanism:

Supporting data:

2007 Update

Update of 2007b

Tag Meeting 2