Research on Pretreatment of High Concentrated Ammonia-nitrogen Wastewater from Coal Gasification Process by Air Stripping

1314.95 mg·L^-1 high concentration ammonia-nitrogen wastewater from Tong Liao tong shun carbon factory of Ende coal gasification process was treated using home-made air stripping device. The influences of temperature, pH, aeration amount when the time was 30 min were studied, the experimental results shows that the optimal conditions are: the temperature 25°, pH 12, aeration amount 1.025 m³·h^-1. In those conditions the ammonia-nitrogen removal rate of waste water can be 88.21%, the ammonia-nitrogen concentration was lower 155 mg·L^-1 and could meet the need of following biochemical process.