TY - JOUR
T1 - Effect of landfill characteristics on leachate organic matter properties and coagulation treatability
AU - Comstock, Sarah E.H.
AU - Boyer, Treavor H.
AU - Graf, Katherine C.
AU - Townsend, Timothy G.
N1 - Funding Information:
This work was supported in-part by the University Scholars Program at the University of Florida. The authors thank Dr. Hwidong Kim for his assistance with BOD and COD analysis, and Shrawan Singh, Karam Singh, Youngmin Cho, and Steve Nataline for their assistance with collecting leachate samples.
PY - 2010/11
Y1 - 2010/11
N2 - This work spans landfill characteristics, leachate organic matter properties, and coagulation chemistry to provide new insights into the physical-chemical treatability of stabilized landfill leachate. Furthermore, leachate organic matter is viewed in terms of dissolved organic matter (DOM) present in the natural environment, and coagulation chemistry is evaluated based on previous leachate and water treatment coagulation studies. Stabilized leachate was collected from four landfills for a total of seven leachate samples, and samples were coagulated using ferric chloride, ferric sulfate, and aluminum sulfate. Landfill characteristics, such as age, leachate recirculation, and cover material, influenced properties of DOM present in the leachate, as measured by specific ultraviolet (UV) absorbance at 254nm (SUVA254) and fluorescence excitation-emission matrices. The coagulation performance of the metal salts was ferric sulfate>aluminum sulfate>ferric chloride, and DOM removal followed the trend of color>UV254>dissolved organic carbon>chemical oxygen demand (COD). Finally, a strong association was found between increasing SUVA254 and increasing DOM removal for coagulation of both leachate and natural surface water. Thus, SUVA254 is expected to be a better predictor of leachate treatability, in particular DOM removal, than the traditionally used ratio of biochemical oxygen demand to COD.
AB - This work spans landfill characteristics, leachate organic matter properties, and coagulation chemistry to provide new insights into the physical-chemical treatability of stabilized landfill leachate. Furthermore, leachate organic matter is viewed in terms of dissolved organic matter (DOM) present in the natural environment, and coagulation chemistry is evaluated based on previous leachate and water treatment coagulation studies. Stabilized leachate was collected from four landfills for a total of seven leachate samples, and samples were coagulated using ferric chloride, ferric sulfate, and aluminum sulfate. Landfill characteristics, such as age, leachate recirculation, and cover material, influenced properties of DOM present in the leachate, as measured by specific ultraviolet (UV) absorbance at 254nm (SUVA254) and fluorescence excitation-emission matrices. The coagulation performance of the metal salts was ferric sulfate>aluminum sulfate>ferric chloride, and DOM removal followed the trend of color>UV254>dissolved organic carbon>chemical oxygen demand (COD). Finally, a strong association was found between increasing SUVA254 and increasing DOM removal for coagulation of both leachate and natural surface water. Thus, SUVA254 is expected to be a better predictor of leachate treatability, in particular DOM removal, than the traditionally used ratio of biochemical oxygen demand to COD.
KW - Aluminum
KW - Fluorescence excitation-emission matrix
KW - Iron
KW - Landfill leachate
KW - Natural organic matter
KW - Specific ultraviolet absorbance
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U2 - 10.1016/j.chemosphere.2010.07.030
DO - 10.1016/j.chemosphere.2010.07.030
M3 - Article
C2 - 20691462
AN - SCOPUS:77957749085
SN - 0045-6535
VL - 81
SP - 976
EP - 983
JO - Chemosphere
JF - Chemosphere
IS - 7
ER -