application of levapor in aquaculture
DESCRIPTION
Application of Levapor for Aquaculture effluent recycle achieving lowest level of nitrogen species in the treated effluent.TRANSCRIPT
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Selection and performanceof biocarriers for aquacultureswith water reuse Christoph GreckiWR IKRA DABIEPoland
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The fish hatchery and farm WR Dabie, Poland
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Targets of the investigations
to improve the efficiency of the water recycle plant via increased nutrient removal, meaning to find a more efficient biocarrier for the removal of fish toxic compounds,than existing plastic carriers
to define the biokinetic parameter of the N-removal
to develop an optimized technology for the N-removal.
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NH3/NH4 NO2 NO3
NitrosomonasNitrobacterfish toxic at >1,0 mg/Ltish toxic at> 0,5 mg/Lnon toxicat 50 mg/LPathways and fish toxicities of inorganic nitrogen compoundsN2denitrification
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Test plant and mode of operationTest plant : Biofilter with V = L volume, each filled with biocarrier
Biocarrier : PE carrier 780 m/m , LEVAPOR >20.000 m/m PU foam 1500 m/m , Keramzit 400 m/m
Mode of operation : a filtered and aerated streams of the recycle water were forwarded through the non colonized carrier layers at xy sec retention time.
Sampling and analyses : grab samples were analysed twice in a week, NH4, NO2 and NO3 were determined.
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The biofilter pilot plants
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PE-carrier LEVAPOR PU foam Ceramics780 m/m > 20.000 m/m 1.500 m/m 400 m/m
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inletRemoval of ammoniacal nitrogen by PE vs. LEVAPOR carrier over a week
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CONCLUSIONS
In all tests LEVAPOR carrier have achieved highest degree of removal both for ammoniacal as well as for nitrite nitrogen
The LEVAPOR supported nitrification achieved a ca. 100 % higher efficiency than the PE carrier supported biofilter
Due to high porosity and carrier surface, the LEVAPOR supported reactor has achieved a remarkable NO2-removal
The LEVAPOR supported biofilter removed 300% more (NH4+NO2)N than the PE carrier supported filter
On basis of the achieved results the company has decided to apply LEVAPOR biocarrier in the new biofilters.
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LEVAPOR biocarrier have been designed in labs.
Dimensions: 20x20x7 mm Surface : 1,34 mio. m/mBulk weight: 30 kg/m - Water binding capacity ~100 kg/mWetting: within few hours Biofilm generation: 120 min.
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Specialty: high content of powdered activated carbon enables unique effects, not only simple cell adhesion .Effects: Adsorption of inhibitors lower toxicity in bioreactor faster bioprocess start stable process
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Scheme of a biofilter using biocarriers
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The new biofilter to be filled with LEVAPOR