grouper farming in recirculated aquaculture systems by m.sc. tom serholt

Grouper Farming in Recirculated Aquaculture Systems

By M.Sc. Tom Serholt

Basic Principles of the Recirculated Grouper Farming System

Project Presentation

Mechanical Filtration

Biological Filtration

Bacteriological Filtration

Example of Recirculated Wastewater Treatment

Recirculation Principles

Excretion products and uneaten feed pellets

Particular Waste Products

Dissolved Waste ProductsAmmonia/Ammonium

Mechanical Filters

Filtration Principle

Particular Waste Products•Particular Waste


(Removed by mechanical filtration)

NH4+

CO2 Stripping and areation (O2)

Particular Waste Products•Excrements

•Feedpellets




NH4+ O2

Pump Sump

Bio Filter Pumps

Submerged Filter

Submerged Filter

Fixed Film Technology

BIO-BLOK 150

Convertion of Amonia to nitrite by Nitrosomonas bacteria sp.

Particular Waste Products•Particular Waste



NH4+ O2

(Convertion of ammonia to Nitrite)

Nitrite

NO2-

Trickling Filter

Trickling Filter

Fixed Film Technology

BIO-BLOK 200

Convertion of Nitrite to Nitrate by Nitrobacter bacteria sp.


•Feedpellets




NH4+ O2


Nitrite

NO2-

(Convertion of Nitrite to Nitrate)

Nitrate

NO3-

O2

Convertion of Nitrate to Nitrogen by anaerobic bacteria sp.


•Feedpellets




NH4+ O2


Nitrite

NO2-

(Convertion of Nitrite to Nitrate)

Nitrate

NO3-

O2

(Convertion of Nitrate to Nitrogen)

Nitrogen

Carbon source N2

Backwash System

Overview

Submerged- and trickling filter Denitrification filter

Ammonia Nitrite Nitrate Nitrogen

Aerobic conditions Anaerobic conditions

O2 O2 Carbon source

NH4+ NO2

- NO3- N2

Particular Waste Products•Particular Waste (Removed by mechanical filtration)

Dissolved Waste ProductsAmmonia/Ammonium (converted in the submerged filter)

Nitrite (converted in the trickling filter)

Nitrate (converted in the denitrification filter)

Nitrogen (emmission to the atmosphere)

Furthermore BOD is converted into Water and CO2


• UV Filtration

• Ozone

• Membrane Filtration

In order to reduce the bacteriological ”pressure”, the following technologies can be used:

Propeller Pumps & UV-Filters

Propeller Pumps

UV-Treatment

Principle of UV Filtration

Oxygenation

Production Figures:

• 500 fish harvested per day with an average weight of 700g. Per fish.

• Size of fingerlings: 30g. Per fish.

• Size of fish at harvest: 700g. Per fish.

• Growth per day: 335kg. Fish per day.

• FCR (Feed Convertion Rate): 1,5

• Fish Feed fed per day: 503kg. Per day

• Feeding Rate: 1,2%

Production Figures:

• 500 fish harvested per day with an average weight of 700g. Per fish.

• Standing Stock 42.000 kg. Fish (total)• Temperature: 27-28 Degrees

Celcius• Daily ”make up” water: 156m3 of water• Circulating water Volume: 2.156 m3 water

per hour

Thank You

grouper farming in recirculated aquaculture systems by m.sc. tom serholt

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