Recirculation systems & new Recirculation Feed

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Karina Berg
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1 Recirculation systems & new Recirculation Feed : Anders Andreasen, Brande

2 Disconnected to river 1. Why new farm layout? Oxygen fluctuations in river water Too high temperatures in summer Water flow too low in summer High infective pressure from the inlet water Environmental limits on discharge- Nitrogen removal Management Daily on feeding and fish handling Maintenance on ponds 31 Model farms is in operation and use tonnes of feed 2. Challenge with Biofilter management Monitoring water/fish Nitrogen removal (nitrification and denitrification) Disease control Faster reaction from manager Energy consumption - Efficiency in technology Feeding management DP/DE and vegetables Overall focus on reducing production cost

3 1. Fish farming in Recirculated Water Production of trout with less fresh water supply Traditional earth ponds Internal recirculating Model Farms Closed system Re. Pump in channels with biofilter Indoor Production per year 100 tons 100 tons 100 tons 100 tons Feed per day 15 C 384 kg feed 384 kg feed 320 kg feed 295 kg feed River water 200 l/sec. 35 l/sec. Ground water 15 l/sec. 2,5 l/sec. Fresh water/day l/kg feed 732 l/kg feed Power consumption 350 kwh/day 180 kwh/day 250 kwh/day 750 kwh/day Installed Power 15 kwh 11 kwh 17 kwh 50 kwh Investment dkk/t prod dkk/t prod dkk/t prod dkk/t prod. 7, /t prod /t prod /t prod /t prod.

4 1.Fish Farm with biofilter. Model farm in concrete One unit: feed per day tons production Fresh water 5-10 l/sec

5 Fish Farm with biofilter. Model farm Omtrentlig grænse for dambruget Skov Skov Pumpebrønd for drænvand Omtrentlig grænse for dambruget "Vandtårn" (og evt. okkerfilter Drænledning Matr.nr. 24 i Slambed Slambed Slambed Slambed Udløb Lavtryksbelufter Slamfælde Mammutbelufter Biofilter Opdrætskanal Nyt slambed Bundfældning Slambassin Mikrosigte Nyt Matr.nr. slambed 24 i Bagkanal 3 50 Bagkanal 3 49 Råsted Lille Å Udløb Støbt kanal Indløb Nyt hus til Matr.nr. 24 h Matr.nr. 24 blæsere h 300 m² Fodersiloer Nye leveringsdamme Fødekanal 2 a Mølle Dam Fødekanal Lagune 19 Bundfældning Bundfældning 14 Råsted Lilleå (nyt løb) Omløbsstryg Stemmeværk m. fisketrappe Udløb Fodersiloer Lager Fødekanal Matr.nr. 24 a Bilag 1 Det er planen, at de resterende damme samt bundfældningsbassinerne udlægges til plantebegroede laguner, og at der derfor kun opdrættes fisk i det nye meter kanalanlæg meter Nymøllevej Nymøllevej Optegnet efter luftfoto og foreliggende skitser Tegnet af: Preben Ikkala Telf Fax Bækvej Bækvej 8, 8, Farre Farre DK-7323 DK-7323 Give Give Nymølle Dambrug Oversigtplan Oversigtplan med forslag til placering Dambrugets nuværende af nyt indretning kanalanlæg Målestok - 1:500 Tegn.: 24/ Rev.: 16/2-06. Tegn.: 24/11-05.

6 Deep Air Lift Grid Grid Air from Delta blower Air Fish in first Fish in second Bundfældning pond 5 cm/sec. 2,5 cm/sec. pond 5 cm/sec. Faeces Collector4500 Partisation wall Diffusor Low head Air lift Good design include Faeces cones Air Fish in first pond Fish in second pond Air from Fan

7 Square pond with low head diffusor at end 180 l/sec 230 l/sec Low pressure airlift High effective for degassing CO kg feed extra per day. With 1 kwh O 2 Air from Fan 50 l/sec

8 150 m3

9 1. Fish Farm with biofilter. Model farm Fish Air Biofilter Flow 1. Cones 2. Moving Bed 3. Fixed Bed

10 Air Moving Bed Biofilter Fast moving and self cleaning biomedia

11 Fixed Bed Biofilter Feeding Air Biofilter management techniques Cleaning one section of Filter High Nitrification High Denitrification Low cost of installation Enough Oxygen Proper ph No too much CO2 Reliability clogging up Low operational cost Fluid bed Plastmedia filter PlastmediaFixed filter LECA/sand

12 2. Challenge with Biofilter management 60 m 3 of biofilter > 250 kg feed Important Proper design Good management Biofilm for Biological filtration Heterotrophic bacteria break down uneaten feed and waste. Autotrotrophic bacteria convert ammonia to nitrite and nitrate Surface of media Slimy long-haired biofilm Solid thin biofilm g biofilm growth per kg feed. Submerge filter media must be cleaned. Oxygen from incoming water 7,3 g biofilm growth per kg feed Fluid bed filter not to be cleaned. Oxygen from Air lift Oxygen from incoming water

13 2. Biofilm management for Nitrogen removal Water parameter 1. Alkalinity 2. ph Capacity bacterier C 200% Lime Easy ph management 150% 100% 50% Control 0% 6 6,5 7 7,5 8 Tvilho Fish Farm 8,5 ph Bad Oxygen management Flow: 360 l/s for fish 160 l/sec for biofilter 90% 3. Oxygen, CO2 and N2 After fish 80% C a p a c ity b a c te rie r O 2 s aturaio n, % 100% 80% 60% 40% 20% 0% 20% Ref.:DTU Aqua 70% After biofilter Control 60% 40% 60% 80% Wash of biofilter O2stress 100% Temperature % O2 outlet 90 kg Ecolife kg Nitrification bacterier 90 kg 50% 02-jul 03-jul 04-jul jul C

14 2. Biofilm management for Nitrogen removal Water parameter 1. Alkalinity 2. ph Rate g NH3/NH4+ per m2 1,5 0,5 3. O 2, CO 2, N 2 & Temp. 1 0 Normal Nitrification Rate 20 C Koncentration mg NK3/NH4+ 5 C 250 kg E kg E kg E kg E kg E kg E kg E20 75 kg E20 50 kg E20 4. Feed per day and select feed standard/orbit for higher nitrogen retention and less faeces Good Oxygen and Orbit Feed increase daily feeding 35 m 3 media 19 gn-nh4 24 gn-nh4 60% O2 Low oxygen in filter reduce feeding 5 C 10 C 15 C 20 C

15 3. What is optimal for Farmer. Summery Necessary analyses of the specific farm: Biomass in tonnes Diagnosis of Fish diseases- Vet are within reach Water flow through biofilter/ponds Water parameter Alkalinity ph Oxygen, CO 2 & N 2 Feed selected for high nitrogen retention and good faeces structure Others

16 Hallundbæk 230 tons

18 % Nasycenost kyslíkem rùzná zaøízení Nasycenost kyslíkem, % Oxygen Saturation, % cca. 95 % cca. 95 % cca. 70 % 40 Èistýkyslík Prokapávací filtr Zzduchové Vzduchové èerpadlo Areátor kyslík filtr èerpadlo

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