Performance of sequencing microbead biofilters in a recirculating aquaculture system |
| |
Affiliation: | 1. Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 1, 7491 Trondheim, Norway;2. Skolkovo Institute of Science and Technology, Novaya St., 100, 143025 Moscow, Russia;3. Department of Physics, Lomonosov Moscow State University, 119991 Leninskie gory 1/2, Moscow, Russia;4. Laboratory of Clinical Biophotonics, Scientific and Technological Biomedical Park, Sechenov University, Moscow, Russian Federation;5. Department of Mathematical Sciences, Norwegian University of Science and Technology, Høgskoleringen 1, 7491 Trondheim, Norway;6. Nofima, The Norwegian Institute of Food, Fisheries and Aquaculture Research, 6600 Sunndalsøra, Norway;7. Nofima, The Norwegian Institute of Food, Fisheries and Aquaculture Research, 1433 Ås, Norway |
| |
Abstract: | Biological filtration, or biofiltration, is the key technology in recirculating aquaculture systems. Sequencing microbead biofilters, in which the media maintains a continuous up-and-down movement, are based on traditional microbead filters but offer superior filtration properties. The performance characteristics of a sequencing microbead biofilter installed in a recirculating aquaculture system for rearing Barcoo perch at 29 ± 1 °C were examined. The total ammonia-nitrogen (TAN) concentrations and the nitrite-nitrogen concentrations during a 52-day culture period were maintained blow 1.6 mg/L and 0.9 mg/L. In order to ensure efficient biofiltration, the optimal actual application of hydraulic retention time was determined to be approximately 3–5 min. The water flow produced by the reciprocating motion of the media served to wash away suspended solids, ensuring the occurrence of optimal nitrification processes. Additionally, the reciprocating motion of the media enhanced ammonia treatment efficiency significantly by improving the transport of nutrients and nitrification activity. Compared to a static situation the ammonia removal rate increased by 27% based on the application of up-and-down reciprocating movement. The biofilm on the microbead forms as a compact, complex, and homogeneous structure, consisting of numerous microscopic thin sheets. Additionally, a multitude of pores, interstitial voids, and vertical channels were widely observed to convey obviously advantageous properties in support of fluid passage, thus enhancing mass transfer and ultimately contributing to biofiltration effectiveness. The optimum biofilm thickness for providing efficient biofiltration was determined to be approximately 70 μm for this filter. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|