Protein skimmer (foam fractionator)
A protein skimmer or foam fractionator has applications in saltwater systems to remove organic compounds from the water before they decompose (break down) into nitrogenous waste. Protein skimming physically removes organic compounds before they begin to decompose. This reduces the load on the biological filter and improves the water's redox potential.
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Protein skimming, or foam fractionation, is an effective filtration tool when used with closed recirculating systems. Saltwater systems can benefit from protein skimming especially in those carrying high fish loads.
Combining a small amount of ozone with protein skimming improves the performance by oxidizing the available organic contaminants. This leads to better flocculation and absorption of particles onto the bubble wall.
When considering the use of ozone, be certain that the air (preferably pure oxygen) used to feed the ozone generator is dry and clean. The feed gas to the ozone generator ultimately establishes the efficiency and operating life of the equipment. Managing ozone dosing can be achieved with an ORP (Oxygen Reduction Potential) Meter.
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Model
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Size (mm)
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Flow rate
(m3/h)
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HRT(min)
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Power (Kw)
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In/out pipe size(mm)
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CL-MPS-30
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Ф800×2500
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30
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1.5
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0.55
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63 cm
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CL-MPS-50
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Ф900×3000
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50
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1.5
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0.9
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75 cm
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CL-MPS-80
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Ф1100×3000
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80
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1.5
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0.9
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90 cm
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CL-MPS-100
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Ф1300×3000
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100
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1.5
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1.1
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110.2 cm
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HRT = hydraulic residence time
Different filtration equipment is suited to handling different particle sizes.
Suspended solids may be removed using foam fractionation, diatomaceous earth filtration or membrane filtration. Suspended solids are a technical problem in recirculating systems. As these solids accumulate they can cause slowed growth and reduced immune resistance (disease susceptibility). Solids removal (faeces, uneaten feed, bacteria flocks, and other solid particles) is key to successful production. Conventional mechanical bead filter separation and foam fractionation, are suitable to remove large particles and fine solid matter.
Economical models
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Click to view larger image
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Model
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Size (mm)
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Flow rate (m3/h)
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HRTømin÷
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Power (Kw)
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In/out pipe size(mm)
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CL-LMPS-5
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Ф400×1800
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5
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1.5
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0.25
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50/63
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CL-LMPS-10
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Ф520×1800
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10
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1.5
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0.37
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50/75
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CL-LMPS-30
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Ф800×2500
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30
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1.5
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0.55
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63/110
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CL-LMPS-50
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Ф900×3000
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50
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1.5
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0.9
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75/140
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CL-LMPS-80
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Ф1100×3000
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80
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1.5
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0.9
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90/160
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CL-LMPS-100
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Ф1300×3000
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100
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1.5
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1.1
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110/200
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Emphasis on Foam Fractionation
The presence of organic carbon (both dissolved and suspended) lowers the value of D.O., pH and redox potential. Sand filters are limited in their ability to eliminate or otherwise control organic carbon. By design, sand filters trap material to improve water clarity. Organic carbon present in this trapped material hydrolyzes and is released back into solution. Biofilms of heterotrophic bacteria develop, utilizing the hydrolyzed carbon and give off CO2, lowering system pH. This affect is only partially diminished by backwashing, since not all of the biofilm is purged during backwash. Depressed pH, D.O. and redox potential characterize traditional systems that rely primarily on sand filters.
Alternatively, foam fractionation (FF) provides continual removal of organic carbon. By design, it pulls long-chained organic molecules out of solution and flocculates this material into thick foam, which is continuously discharged. Trapped within the sticky foam are particles, which include a significant concentration of suspended organic carbon. Thus, the negative effects of organic biodegradation of sand filters are short-circuited by aggressive use of fractionation. Additionally, the loading on sand filters is reduced, allowing them to perform more efficiently.
Additional information
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 "p2")
 "p1")
 "p3")
