The COD-to-Ammonia Ratio Sets the Dose, Not the COD Number Alone

Two leachates were tested the same week, both quoted at COD 18,000 mg/L. The first came from a cell five years old, ran at pH 5.8 with ammonia at 420 mg/L and a BOD to COD ratio of 0.48, and gelled firmly at 14 kg/m³. The second came from a closed cell fourteen years old, ran at pH 8.2 with ammonia …