Efficacy of commercial shrimp farm bioremediators in removing ammonia in microcosm experiments

Ghosh, Shubhadeep and Sasmal, Debasis and Jawahar Abraham, T (2006) Efficacy of commercial shrimp farm bioremediators in removing ammonia in microcosm experiments. Indian Journal of Fisheries, 53 (4). pp. 469-473.

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Abstract

The efficacy of two commercial aquaculture bioremediators to remove ammonia was tested under laboratory conditions. The bioremediators were capable of removal of total ammoniacal nitrogen (TAN) to the tune of 86 - 90% (max) at 1-3 ppm initial level of ammonia (NH3) and the removal rate decreased thereafter. Significant differences in nitrite (NO2) levels in treated and control tanks were observed probably due to the differences in the levels of resident nitrifying bacteria that utilize NH3 and oxidize it to NO2. The nitrate levels increased in all the treatment tanks, but showed a general decreasing trend in control tanks. Among the tanks with varied NH3 concentrations, the levels of NO3 between the control and treatment tanks differed insignificantly (P>0.05). The results of the present study revealed that the commercial bioremediators failed to remove majority of the total ammoniacal nitrogen when the NH3 level is high initially.

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