The ammonia nitrogen level in the nitration effluent is extremely high and cannot be degraded
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During the commissioning of the landfill leachate treatment system, the designed daily water inflow was 50 cubic meters; the COD level of the incoming water was 5500, while the ammonia nitrogen level was 1600. The nitrification reflux rate was set at 400%, and when the sedimentation ratio reached 8%, the water inflow was increased to 30 cubic meters. However, in recent days the ammonia nitrogen level has remained at 540, failing to decrease, and the COD level has also stayed at 1500. The pH level in the nitrification tank is 8.45, and this value does not decrease either. The denitrification pH is also 8.45, showing a slight decrease. It’s been stuffy and hot lately, with no improvement at all. I’ve reduced the nitration reflux, but the pH level in the nitration system still doesn’t drop. I’d appreciate advice from experts on how to solve this issue
The ammonia nitrogen level in the incoming water is 1600 ppm, and it is very difficult to remove this substance through biochemical methods. I’m not sure how this process route passed the review, but with such high levels of ammonia nitrogen, shouldn’t some pre-treatment be carried out – such as stripping or air stripping – to reduce the ammonia nitrogen level to 200–300 before carrying out denitrification and nitrification.