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Protein skimmer  = foam fractionater
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[Ecotao Home] [Water related] [Filtration] [Protein skimmer]

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.

proteinskimmer
p2

Click to link to larger image

 

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.

 

Model

Specification, diameter

capacity(m3/h) detention time

(1min) HRT

capacity (m3/h) detention time

(1.5 min) HRT

capacity(m3/h)

detention time
(2min) HRT

inlet/outlet (mm)

ECO-PS-10

450X1900

10

5

3

50/90

ECO-PS-20

600X1950

20

10

7

63/110

ECO-PS-30

650X2250

30

15

10

63/110

ECO-PS-40

750X2350

40

20

13

63/140

ECO-PS-50

850X2600

50

25

17

75/140

ECO-PS-60

850X2850

60

30

20

75/160

ECO-PS-80

850X3200

80

40

27

90/160

ECO-PS-100

1000X3150

100

50

33

110/200

ECO-PS-120

1200X3100

120

60

40

110/250

ECO-PS-140*

1300X3100

140

70

47

140/250

ECO-PS-160

1300X3300

160

80

53

160/250

ECO-PS-180*

1400X3300

180

90

60

160/250

ECO-PS-200

1500X3400

200

100

67

200/250

HRT = hydraulic residence time

Different filtration equipment is suited to handling different particle sizes.

filter-ranges

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

p1
p3

Click to view larger image

Marine protein skimmer with no foam collection cup



Model 2013



Specification

capacity (m3/h)

detention time

 (1.min)

capacity (m3/h)

 detention time

 (1.5min)

capacity (m3/h)

detention time

(2min)



inlet/outlet (mm)

ECOPS-10

Ф4501650

10

5

3

50/90

ECOPS-20

Ф6001700

20

10

7

63/110

ECOPS-30

Ф6502100

30

15

10

63/110

ECOPS-40

Ф7502100

49

20

13

63/140

ECOPS-50

Ф8502200

50

25

17

75/140

ECOPS-60

Ф8502450

60

30

20

75/160

ECOPS-80

Ф9502600

80

40

25

90/160

ECOPS-100

Ф9503050

100

50

33

110/200

ECOPS-120

Ф12002800

120

60

40

110/250

ECOPS-140*

Ф13002700

140

70

47

140/250

ECOPS-160

Ф13002900

160

80

53

160/250

ECOPS-180*

Ф14002900

180

90

60

160/250

ECOPS-200

Ф15003000

200

100

67

200/250

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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