Nitrate removal by laboratory and field continuous-flow zero-valent iron (Fe0
) packed bed columns was evaluated
for different influent water qualities (pH, dissolved oxygen (DO), nitrate concentration) and several months of
operation (600–1500 bed volumes (BVs)). In contrast to previous batch experiments with Fe0 where nitrate was
stoichiometrically converted to ammonium, only 70% of the applied nitrogen was recovered as nitrate, ammonium, or
nitrite (o0.1 mg/L) during shorter-term column tests (2–20 BVs) and less than 25% of the applied nitrogen was
recovered during longer-term field testing (500–1000 BVs) at elevated nitrate levels (B25 mg N/L). Nitrate removal was
accompanied by a pH increase, DO decrease, and soluble iron increase. During longer-term oUSE OF ZERO-VALENT IRON FOR
WASTEWATER TREATMENT
Nitrate removal by laboratory and field continuous-flow zero-valent iron (Fe0) packed bed columns was evaluatedfor different influent water qualities (pH, dissolved oxygen (DO), nitrate concentration) and several months ofoperation (600–1500 bed volumes (BVs)). In contrast to previous batch experiments with Fe0 where nitrate wasstoichiometrically converted to ammonium, only 70% of the applied nitrogen was recovered as nitrate, ammonium, ornitrite (o0.1 mg/L) during shorter-term column tests (2–20 BVs) and less than 25% of the applied nitrogen wasrecovered during longer-term field testing (500–1000 BVs) at elevated nitrate levels (B25 mg N/L). Nitrate removal wasaccompanied by a pH increase, DO decrease, and soluble iron increase. During longer-term oUSE OF ZERO-VALENT IRON FORWASTEWATER TREATMENT
การแปล กรุณารอสักครู่..
