Problems with total nitrogen in the activated sludge process
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The activated sludge process is used to treat wastewater from industrial parks, mainly wool washing wastewater, steel plant wastewater, and domestic sewage. It has been found that the total nitrogen in the water from the third sedimentation tank is always higher than that in the second sedimentation tank. What is the reason for this? The total nitrogen in the effluent from the second sedimentation stage is between 10–13 mg/L, while it can reach 15 mg/L in the effluent from the third sedimentation stage.
It’s probably all caused by sludge – the total nitrogen contributed by microorganisms when the SS in the effluent is high.