Anaerobic Digestion Effluent Treatment
Introduction
Anaerobic digestion effluent is characterized by high concentrations of Suspended Solid(SS), COD, and ammonia, and a low ratio of carbon (C) to nitrogen(N）．Due to the low C / N ratio, nitrate generated from ammonia is accumulated during biological treatment.
Principle
The concentration of ammonia is selectively reduced by ammonia stripping to improve C/N ratio. Before ammonia stripping, SS is separated to prevent clogging in the ammonia stripping. Separation of SS significantly reduces COD load.
Advantages
✓ Improve C / N ratio by ammonia stripping.
✓ Removal of solid COD components significantly reduces COD load without oxidation.
✓ Since the nitrogen concentration is reduced at the ammonia stripping outlet, the risk of nitrate accumulation in subsequent process is small.
Treatment of Methane fermentation digestion Effluent
This is the achievement which is planed to the treatment of methane fermentation digestion effluent. Because high concentration of SS which increase COD is contained in the effluent, SS separation is applied for the first step of treatment. For the next step, ammonia is stripped. For the last step, the remained COD is decomposed by chemical oxidation. Since there is no biological processing, it is not necessary to operate at no raw water condition. Operating on demand.
