Optimization of fermentation media for nitrite oxidizing bacteria using sequential statistical design.
The sequential statistical experimental design (Plackett-Burman, factorial, response surface and steepest ascent experiment) was applied to optimize the culture medium of nitrite oxidizing bacteria for improving the nitrite oxidizing rate. Estimated optimum medium composition of the nitrite oxidizing rate was as follows: NaHCO3, 1.86gl(-1); NaNO2, 2.04gl(-1); Na2CO3, 0.2gl(-1); NaCl, 0.2gl(-1); KH2PO4, 0.1gl(-1); MgSO4 x7H2O, 0.1gl(-1); and FeSO4 x 7H2O, 0.01gl(-1). The nitrite oxidizing rate was increased by 48.0% and reached a maximum at 859.5+/-8.4mgNO2-N/gMLSS.d as compared to 580.7+/-25.8mgNO2-N/gMLSS x d. In the field trial, 50L of nitrite oxidizing bacteria concentrate (1.99gVSS/L) with 850mgNO2-N/gMLSS x d were added to 0.6ha of the aquaculture water. Nitrite level in all treated ponds remained very low compared to the steady increase observed in all of the control ponds during 7 days.
Ren
Jie
J
College of Biological Science and Engineering, South China University of Technology, Guangzhou 510006, PR China.
Lin
Wei-Tie
WT
Shen
Yan-Jing
YJ
Wang
Ju-Fang
JF
Luo
Xiao-Chun
XC
Xie
Ming-Quan
MQ
D000704:Analysis of Variance; D000818:Animals; D017756:Aquaculture; D001419:Bacteria / Q000378:metabolism*; D003470:Culture Media; D005163:Factor Analysis, Statistical; D005285:Fermentation; D009573:Nitrites / Q000378:metabolism*; D010084:Oxidation-Reduction; D033561:Penaeidae; D013997:Time Factors
D003470:Culture Media; D009573:Nitrites