Biochemical method nutrient ratio
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Nitrogen control: Theoretically, the carbon-to-nitrogen ratio required for denitrification to occur under anoxic conditions in sludge is 2.86. The nutrient ratios of carbon, nitrogen, and phosphorus needed for the growth of activated sludge are 200–300:5:1 under anoxic conditions, and 100:5:1 under aerobic conditions. So the question arises: how should the nitrogen concentration be controlled during denitrification? Some people explain that in the former case, nitrogen refers to total nitrogen, while in the latter case it refers to ammonia nitrogen; hence the values differ. Ammonia nitrogen control: I’ve heard from engineers working on site that for wastewater with high COD levels, it makes sense to calculate based on the CNP ratio. For wastewater with low COD levels, keeping the ammonia nitrogen level below 10 under aerobic conditions and below 50–80 under anaerobic conditions is beneficial for biochemical processes. Do everyone agree with this view? Seeking expert opinions
This post was last edited by Gorō Bagua Stick on 2015-9-9 21:20. For wastewater with low COD, an appropriate BOD ratio should be maintained for aerobic ammonia nitrogen; otherwise, nitrification cannot take place