application of levapor carriers for nitrification-denitrification in recycled aquaculture systems
TRANSCRIPT
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Selection and performanceof biocarriers for aquacultures
with water reuse
Christoph GreckiWR IKRA DABIE
Poland
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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
Nitrosomonas Nitrobacter
fish toxic at >1,0 mg/L
tish toxic at> 0,5 mg/L
non toxicat 50 mg/L
Pathways and fish toxicities of inorganic nitrogen compounds
N2
denitrification
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Test plant and mode of operation
Test plant : Biofilter with V = L volume, each filled with biocarrier
Biocarrier : PE carrier 780 m²/m³ , LEVAPOR >20.000 m²/m³ PU foam 1500 m²/m³ , Keramzit 400 m²/m³
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 m²/m³ > 20.000 m²/m³ 1.500 m²/m³ 400 m²/m³
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inlet
Removal 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. m²/m³Bulk weight: 30 kg/m³ - Water binding capacity ~100 kg/m³Wetting: 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