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C:N ratios

Dallas E. Weaver, Ph.D. deweaver at gte.net
Fri May 8 02:00:55 EST 1998

It all depends upon how fast you want to grow the bacteria.  One way to
look at the problem is in terms of yield of bacterial biomass (dry wt)
per amount of feed.  With a yield in the 50% range, the C:N ratio would
be in the 10 range for the nitrogen in the bacteria to balance, assuming
the bacteria are burning the C for energy (i.e.. no nitrifiers getting
energy from ammonia oxidation or a nitrate nitrogen source in an aerobic
system).  If you grow the organism slower, such as with low nutrient
concentrations near the minimum for growth, the organism will spend more
energy per unit of growth and the yield will decrease and the C:N ratio
will increase.
Dallas E. Weaver, Ph.D.                     Scientific Hatcheries
deweaver at gte.net                            5542 Engineer Dr.
714-890-0138                                Huntington Beach, CA
Fax 714-890-3778                                      92649

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