Page 67 of AES Mastercatalog by Aquatic Eco-Systems

the original is still the best these high-quality resin-bonded ceramic plate diffusers are recommended where pure gas including oxygen and carbon dioxide is to be used they produce a cloud of ultra-fine bubbles 100­500 microns in size for excellent gas transfer fifty percent oxygen transfer at a depth of 4 is typical because of the small pore size a minimum operating pressure of 25 psi is required the diffusers are set in enamel-coated aluminum frames operating range is 25­50 psi two-year warranty made in canada by point four systems inc ultra-fine bubble diffusers wedge-lock diffusers wedge-lock is a modular system of ultra-fine bubble diffusers that fit together to form a bank of up to 8 units the modular design makes it easy to add or subtract diffusers to match changing needs the diffuser modules twist and lock together to form an airtight seal without the use of tools order one end set ense per bank dbu of wedge­locks made from tough uv-resistant plastic the streamlined wedge shape is more stable in tanks with high water flow single base unassembled diffusers measure 5.4 x 6.6 x 1.25 and weigh 1.8 lbs recommended flow 1.6 cfh 75 lpm maximum flow 3.4 cfh 1.6 lpm recommended operating pressure is 22-35 psi maximum pressure is 50 psi inlet is 1/4 barb fitting one-year warranty above 50 psi 3.4 bars the diffuser can break aeration fine-pore diffusers/tech talk as404 as303 as202 as101 dbu diffusing area cm optimum flow cfh/lpm as101 50 as202 100 as303 200 as404 400 dbu wedge-lock base unit ense end set note 100 pure o2 ense ship wt diffusing area in 6 x 11/8 121/8 x 11/8 121/8 x 23/8 241/4 x 23/8 5 dia x 1 h 15 x 2.9 30 x 2.9 30 x 6 60 x 6 12.7 x 2.54 1.6 75 3.2/1.50 6.4/3.00 12.7/6.00 3.4/1.6 1 lb 2 lbs 3 lbs 5 lbs 1.8 lbs 55 78 130 210 55 38 48.00/10 70.00/10 122.00/6 197.00/6 50.51/10 35.70/10 tech talk 52 aeration energy consumption replacing medium and fine-bubble diffusers with coarse-bubble diffusers might seem like a good way to avoid periodic cleaning but it s not very cost effective let s work out the economics on a 10-horsepower system if a 10-horsepower medium-bubble aeration system can support 40,000 pounds of fish a coarse-bubble system would require 30 horsepower electricity currently costs about $70 per horsepower per month in our area this would make the utility cost rise from $700 a month to $2,100 that s an extra $16,800 per year paid to the power company an additional 20 horsepower in blowers would need to be purchased as well as a larger diameter air-distribution pipe if coarse-bubble diffusers were chosen over medium-bubble diffusers system design with medium-bubble diffusers diffuser placement should allow for easy removal and time should be allotted to clean all the diffusers in one section at one time this not only reduces the aggravation created by multiple individual cleanings but also it suggests when to schedule the next cleaning with our sweetwater® glass-bonded diffusers frequency of cleaning can range between monthly in very hard water to once per year in soft water aquatic eco-systems inc introduced the low-pressure low-maintenance medium-bubble air diffuser to the aquaculture industry in 1978 our glass-bonded silica medium-pore diffuser is still the standard we re always looking for a better diffuser that is one with finer bubbles lower pressure loss self-weighting nonclogging and less expensive when we find one we ll let you know if you find one better than the sweetwater ® diffusers please let us know mechanical aerators break water into droplets to produce liquid/air contact while underwater diffusers introduce bubbles from a depth to achieve oxygen transfer and mixing bubble type aeration systems are replacing many mechanical aerators because of their low maintenance reliability safety flexibility and overall efficiency they excel where small amounts of aeration circulation and carbon dioxide degassing are needed in many locations bubble aerators are also better at removing gases such as ammonia and carbon dioxide diffusers are made to deliver either coarse approximately 6 mm medium approximately 3 mm or fine approximately 1 mm air bubbles coarse-bubble systems require the lowest air pressure and are very resistant to clogging but are about a third as efficient as medium-bubble systems in transferring oxygen to the water the medium-bubble diffuser requires only slightly higher air pressure but its superior oxygen transfer more than compensates for the increase in maintenance the fine-bubble diffuser s superior oxygen transfer usually does not compensate for its higher pressure and maintenance requirements fine-bubble diffusers are typically chosen for pure oxygen or ozone systems where pressure requirements are less important than transfer efficiency overall when aerating with air medium-bubble diffusers are the most popular among aquaculturists diffuser clogging can occur from the inside of medium and fine pore diffusers by dust and dirt particles carried by the air supply if an air inlet filter is not used but clogging is most often due to calcium carbonate deposits this source of plugging is prevalent in hard water and salt water another source of plugging is bacterial slime which also forms on the external surface of the diffuser a short course in fine bubbles lesson 1 this large bubble 20 mm has a volume of 4.19 cm3 and a surface area of 12.6 cm2 lesson 2 296 small bubbles 3 mm could be made from the large bubble in lesson 1 they would have a total surface area of 83.6 cm2 this is 6.6 times the surface area of the large bubble lesson 3 theoretically with the small bubbles 6.6 times as much water can be aerated with the same amount of air °c solubility of oxygen in fresh water use this table to air calibrate d.o meters at sea level 29.92 inches hg barometric pressure °f o2 ppm ºc ºf o2 ppm 0 2 4 6 8 10 12 14 16 18 20 32.0 34.8 39.2 42.8 46.4 50.0 53.6 57.2 60.8 64.4 68.0 14.6 13.8 13.1 12.5 11.9 11.3 10.8 10.3 9.9 9.5 9.1 22 24 26 28 30 32 34 36 38 40 71.6 75.2 78.8 83.4 86.0 89.6 93.2 96.8 100.4 104.0 8.7 8.4 8.1 7.8 7.5 7.3 7.1 6.8 6.6 6.4 64 order online aquaticeco.com order by phone 877-347-4788 tech support 407-598-1401

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