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| Effects of Different Fishery Drugs on Activity of Denitrifying Bacteria Pseudomonas stutzeri and Bacillus amyloliquef aciens |
| ZHANG Feng-feng,XIE Feng-xing,ZHOU Ke,ZHAO Yu-jie,FAN Zhen-zhong,ZHANG Min |
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Abstract Different concentrations of 5 fishery drugs (potassium permanganate ,copper sulfate mixture , chlorine dioxide ,glutaraldehyde and abamectin) were added to the medium of bacteria ,the A600 and the nitrogen concentrations of liquid culture for 24 hours in order to study the influence of fishery drugs on the activity of denitrifying bacteria Pseudomonas stutzeri and Bacillus amyloliquef aciens .The results showed that denitrifying bacteria were most sensitive to potassium permanganate ,glutaraldehyde and chlorine dioxide ,significant decrease in nitrite removal rate ,biomass and the denitrification ability of denitrifying bacteria (P < 0 .05) at 4 mg/L of potassium permanganate ,0 .1 mg/L of glutaraldehyde ,and 0 .3 mg/L of chlorine dioxide (P < 0 .05) ,indicating that these drugs are not mixed in application .However ,the activity of the denitrifying bacteria was not affected by copper sulfate mixture and abamectin which can be mixed in application .B .amyloliquef aciens was most sensitive to potassium permanganate ,copper sulfate mixture ,and chlorine dioxide , significant decrease in removal rate of nitrite at 2 mg/L of potassium permanganate ,0 .25 mg/L of copper sulfate mixture ,and 1 mg/L of chlorine dioxide ( P < 0 .05) , indicating that these drugs are not mixed in the practical application .Glutaraldehyde and abamectin were not found to affect the activity of B .amyloliquef acien ,and be mixed for use .
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Received: 25 October 2013
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