Bright Singh, I S; Rosamma, Philip; Cini, Achuthan; Rejish Kumar, V J; Manju, N J(Springer, November 15, 2008)
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Abstract:
Two distinct nitrifying bacterial consortia,
namely an ammonia oxidizing non-penaeid culture (AMO
NPCU-1) and an ammonia oxidizing penaeid culture
(AMOPCU-1), have been mass produced in a nitrifying
bacterial consortia production unit (NBCPU). The consortia,
maintained at 4 C were activated and cultured in a 2 l
fermentor initially. At this stage the net biomass (0.105 and
0.112 g/l), maximum specific growth rate (0.112 and
0.105/h) and yield coefficients (1.315 and 2.08) were calculated
respectively, for AMONPCU-1 and AMOPCU-1
on attaining stationary growth phase. Subsequently on
mass production in a 200 l NBCPU under optimized culture
conditions, the total amounts of NH4
?–N removed by
AMONPCU-1 and AMOPCU-1 were 1.948 and 1.242 g/l
within 160 and 270 days, respectively. Total alkalinity
reduction of 11.7–14.4 and 7.5–9.1 g/l were observed
which led to the consumption of 78 and 62 g Na2CO3. The
yield coefficient and biomass of AMONPCU-1 were 0.67
and 125.3 g/l and those of AMOPCU-1 were 1.23 and
165 g/l. The higher yield coefficient and growth rate of
AMOPCU-1 suggest better energy conversion efficiency
and higher CO2 fixation potential. Both of the consortia
were dominated by Nitrosomonas-like organisms. The
consortia may find application in the establishment of
nitrification within marine and brackish water culture
systems.
Description:
World J Microbiol Biotechnol (2009) 25:407–414
DOI 10.1007/s11274-008-9905-1