ABIOTIC DEGRADATION OF NITRATES USING ZERO-VALENT IRON AND ELECTROKINETIC PROCESSES

摘要

Nitrte transformation in artificial saturated soils made from sand and/or clay mixed with nitrate-contaminated water was investigated using (1) zero-valent iron treatment,(2) electrokinetics treatment alone, and (3)electrokinetics coupled with an iron treatment wall placed near the cathode or anode. Approximately 75-98 of the nitrates were transformed using zero-valent iron to treat the artificial soils. The major products in the zero-valent-assisted transformation were nitrogen gases (75-81) and ammonia-nitrogen (2018 ).Nitrite-nitrogen was less than 1 in all these experiments. With electrokinetics alone, some nitrates were transformed (about 30/100 ).Nitrate transformation was about 60 with the iron wall placed near the cathode, and was about 95/100 with the iron wall placed near the anode.