FATE OF PIG SLUDGE LIQUID FRACTION IN CALCAREOUS SOIL - AGRICULTURAL AND ENVIRONMENTAL IMPLICATIONS

The characterization of pig sludge liquid fraction (PSLF) was conducte d to achieve a better understanding of its chemical and physical chemi cal characteristics, Total dissolved organic carbon (TDOC) from pig sl udge was separated into two fractions: acid insoluble dissolved organi c carbon (AIDOC) and acid soluble dissolved organic carbon (ASDOC). El emental analysis, acidic functional group determination, E-4/E-6 ratio , Gel-Filtration Cromatography and FTIR Spectroscopy of ASDOC and AII) OC showed a similarity with humic and fulvic acids, isolated from soil s and organic wastes. Phosphorus-31 Nuclear Magnetic Resonance spectra demonstrated that the organic P in PSLF was present as P-monoester. T he complexing capacity of DOC vs. trace metals was demonstrated by Gel Filtration Chromatography and FTIR Spectroscopy, The interactions of DOG, Cu, and Zn, present in PSLF, with a calcareous soil were evaluate d by adsorption isotherms that indicated that Zn was completely adsorb ed by the soil, while Cu followed the same behavior as DOG, with only partial adsorption, Therefore, both Cu and DOC should be taken into co nsideration as a possible groundwater pollution hazard after pig sludg e application to calcareous soil.