Why is the ratio of total nitrogen to ammonia nitrogen in the effluent higher than that in the influent?
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The wastewater treatment plant uses the SBR process; the inlet COD value is 161, SS is 296, ammonia nitrogen is 12, total nitrogen is 130, and total phosphorus is 2.5； The effluent values are COD=48, SS=120, ammonia nitrogen=14, and total nitrogen=154. Could experts please analyze why the levels of total nitrogen and ammonia nitrogen in the effluent are higher than those in the inlet water?
Your biochemical tank isn’t functioning properly; adjust the process parameters – check the dissolved oxygen level, temperature, aeration frequency, pH, and so on. It’s a serious problem. The ammonia nitrogen level hasn’t decreased; as for total nitrogen, there’s no need to even mention it. The decrease in SS is most likely due to too long a resting time – increase aeration to facilitate the digestion process instead of reverse digestion
Aeration can achieve levels above 5 mg/l
Also, the alkalinity is fine, around 200