What to do if the ammonia nitrogen level in the effluent from an A/O system is too high and does not meet the standards?
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When the organic nitrogen in wastewater is decomposed through hydrolysis and acidification into wastewater with high concentrations of ammonia nitrogen, it enters the A/O system, resulting in elevated ammonia nitrogen levels in the effluent from this system, which does not meet the required standards. What should be done?
1. Does the pretreatment system have pre-aeration? This can help to remove some of the ammonia nitrogen. 2. If the water inflow volume remains constant but the ammonia nitrogen concentration in the biological treatment tank increases, with the HRT staying the same, it is necessary to ensure that there is sufficient sludge concentration; in such cases, the aeration volume should be increased and the carbon-to-nitrogen ratio raised. 3. Alternatively, the water inflow volume to the biological treatment tank can be reduced, while the HRT is increased. 4. Increasing the return flow of the mixed liquor from the aerobic tank can aid in denitrification