Why we only consider TAN value in biofloc (as i read in most of the papers) to maintain the C:N ratio. Why not Nitrite and Nitrate values. Nitrate and Nitrite also contribute in Nitrogen content, for example, say the value of TAN is 1 ppm (we don't know the ammonium or ammonia) and we start to calculate the dose of carbon to maintain the ration 15:1 say. But suppose say Nitrite value is 10 ppm and nitrate value is 2 ppm and Tan value is 0.5 ppm. So if we are talking about Nitrogen in the system so all must be considered? Like in the here Total calculated nitrogen must be (10+2+0.5 ppm) . Please suggest your valuable comment on this.
@ Vivek, the C:N ratio is used as an indication of mineralisation or immobilization whether will occur. Therefore, it is total concentration of carbon divided by the total concentration of nitrogen.Total concentration of nitrogen means summation of nitrate, nitrite, ammonia and microbial nitrogen. So, you cannot consider only nitrate or nitrite concentration.
J. C. Tarafdar
Thanks, sir for answering my question. Actually that's what i was thinking, and I asked this question because in many research papers they were considering or mentioning only TAN or ammonia for the carbon dose, they are not talking about Nitrite or Nitrate. Further, so many books abstracts also shown calculation of Carbon dose based on Ammonia level in the system.
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