Performance evaluation of the compact aquaculture system integrating submerged fibrous nitrifying biofilters
Kasidit Nootong and Sorawit Powtongsook
pp. 53 - 59
Abstract
This experiment assessed the performance of submerged fibrous nitrifying biofilters (SFNBs) to carry out the zerowater exchange tilapia cultivation. Without biofilter cleaning, the SFNBs (21 m of biofilter length) were susceptible to hydrogen sulfide production when operating beyond the aquaculture density of 13.62 kg/m3 . The SFNBs were able to maintain total ammonia nitrogen (TAN) and nitrite below 1.0 mg N/L throughout the experiment and could handle inorganic nitrogen loading as high as 38.6 mg N/L/day when the solid removal from biofilters was performed biweekly. Ammonium degradation rate measured at the end of this study was 380±66 mg N/m2 /day for biofilters subjected to cleaning. A significantly lower rate of 41.4±2.86 mg N/m2 /day was associated with biofilters without any solid removal. Finally, the SFNBs should be attractive for budget-limited farmers since they are simple to build and operate and can provide alternatives to cage-cultured systems.
