Buyers of fine
bubble diffusers for their sewage treatment plant or industrialized waste water
remedy plant have many possibilities to make when choosing equipment for their
task.
Fine bubble diffusers are accessible in several shapes, including discs, tubes, squares, and rectangular panels, and in several supplies, including elastomers like EPDM and holey medium like Aluminum Oxide, Porcelain, or HDPE. Many books and papers have been published on the distinctions between these media.
However, there are still numerous inquiries regarding the superiority or utility of disc vs. tube vs. panel.
Several of the producers in the industry produce multiple sorts of diffuser, though they tend to prefer and promote one moreso than the others, generally for industrial causes (they have a greater margin on one product) or for factors of products differentiation (when given by a customer or technician, it is hard to locate "equal" competitors).
Many tests of oxygen transfer efficiency have been carried out over the years on each type of diffuser (some of which are published in the ATV Handbuch), however product growth is powerful, and what was examined in the mid 1980's may not apply today to contemporary discs, tubes and panels.
There are some common sense concepts to comply with, irrespective of the growth of the approaches.
In a correctable system made of pricey stainless steel, the diffuser, which can deal with the most air with the minimum stainless structure, is going to be a beautiful option. Normally, tube fine bubble diffusers are seen on retrievable systems for this reason.
In a fixed system where the pipes are bolted to the floor, and
longevity and
low maintenance are necessary, disc fine bubble diffusers are more common than
tubes.
Where failure mode is important (i.e. catastrophic vs. slow) disc fine bubble diffusers may be preferred over tubes. Tube fine bubble diffusers usually have a large air orifice, hence in case of a membrane rupture or clamp failure; a big volume of air can get away from that orifice, depriving the rest of the system.
The deeper the tank, the less benefit panel Fine bubble diffusers present with regards to productivity. Panels are usually designed to produce quite fine bubbles. In a shallow tank, this is an advantage, albeit a costly one because panel systems generally bear a hefty price tag due to the level of equipment needed to invest in and put in. Nonetheless, in a deeper tank, so much of the oxygen is transferred by the time the bubble has increased 15 ft that the bubble is stated to be oxygen depleted, thus the benefit disappears. One should also be cognizant of the head loss of panel fine bubble diffusers, because what is obtained with regards to effectiveness from small bubbles is usually lost in extra power necessary to conquer the high back pressure of panel membranes.
No matter the sort of diffuser, one should think about PTFE coated membrane Fine bubble diffuser, which might extend the lifetime of the membrane and will also reduce surface fouling also.
Fine bubble diffusers are accessible in several shapes, including discs, tubes, squares, and rectangular panels, and in several supplies, including elastomers like EPDM and holey medium like Aluminum Oxide, Porcelain, or HDPE. Many books and papers have been published on the distinctions between these media.
However, there are still numerous inquiries regarding the superiority or utility of disc vs. tube vs. panel.
Several of the producers in the industry produce multiple sorts of diffuser, though they tend to prefer and promote one moreso than the others, generally for industrial causes (they have a greater margin on one product) or for factors of products differentiation (when given by a customer or technician, it is hard to locate "equal" competitors).
Many tests of oxygen transfer efficiency have been carried out over the years on each type of diffuser (some of which are published in the ATV Handbuch), however product growth is powerful, and what was examined in the mid 1980's may not apply today to contemporary discs, tubes and panels.
There are some common sense concepts to comply with, irrespective of the growth of the approaches.
In a correctable system made of pricey stainless steel, the diffuser, which can deal with the most air with the minimum stainless structure, is going to be a beautiful option. Normally, tube fine bubble diffusers are seen on retrievable systems for this reason.
In a fixed system where the pipes are bolted to the floor, and
longevity and
low maintenance are necessary, disc fine bubble diffusers are more common than
tubes.Where failure mode is important (i.e. catastrophic vs. slow) disc fine bubble diffusers may be preferred over tubes. Tube fine bubble diffusers usually have a large air orifice, hence in case of a membrane rupture or clamp failure; a big volume of air can get away from that orifice, depriving the rest of the system.
The deeper the tank, the less benefit panel Fine bubble diffusers present with regards to productivity. Panels are usually designed to produce quite fine bubbles. In a shallow tank, this is an advantage, albeit a costly one because panel systems generally bear a hefty price tag due to the level of equipment needed to invest in and put in. Nonetheless, in a deeper tank, so much of the oxygen is transferred by the time the bubble has increased 15 ft that the bubble is stated to be oxygen depleted, thus the benefit disappears. One should also be cognizant of the head loss of panel fine bubble diffusers, because what is obtained with regards to effectiveness from small bubbles is usually lost in extra power necessary to conquer the high back pressure of panel membranes.
No matter the sort of diffuser, one should think about PTFE coated membrane Fine bubble diffuser, which might extend the lifetime of the membrane and will also reduce surface fouling also.
Often fine Bubble diffuser are put in in the same tank with flow boosters.
This is the situation for the Oxidation Ditch process, for instance.
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