Efficacy of nitrifying bacteria for controlling ammonia and nitrite | ประสิทธิภาพของไนตริไฟอิงแบคทีเรียในการควบคุมปริมาณแอมโมเนีย และไนไตรท์
2009
Gunyanat Kundee(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Aquaculture Business Research Center) | Chalor Limsuwan(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Aquaculture Business Research Center) | Niti Chuchird(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Aquaculture Business Research Center) | Pornlerd Chanratchakool(Novozymes Biologicals Asia Pacific (Thailand))
Efficacy of nitrifying bacteria for controlling ammonia (NH3) and nitrite (NO2-) in the laboratory was studied. Ammonia and nitrite were prepared by mixing sludge from a shrimp pond with shrimp feed for 3 days. After that the experiments were divided into four groups : group 1, with no bacteria, served as control and for groups 2, 3 and 4, nitrifying bacteria were added at 0.1, 0.5 and 1 mg/l, respectively. The same dosage of bacteria was added into each group again at day 7. The average ammonia in all treatment groups was reduced to the lowest concentrations on the fifth day at the values of 2.30+-0.21, 0.90+-0.12, 0.88+-0.10 and 0.80+-0.12 mg/l, respectively. Moreover, the lowest concentrations of nitrite were observed on the sixth day as 3.10+-0.15, 1.99+-0.07, 1.96+-0.05 and 1.94+-0.09 mg/l, respectively. Later on, ammonia and nitrite concentrations simultaneously increased again. However, both ammonia and nitrite dropped again on day 2 after the second application and remained lower than the control group throughout the experiment.
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