Fine Bubble Tube Diffuser (LTF-275)
Key Features
| Fine Bubble Tube Diffuser (LTF-275) | : | Product Name Fine Bubble Tube Diffuser (LTF-275) Model LTF-275 Type Fine Bubble Tube Diffuser Manufacturer / Brand LONGTECH / Indian Carbon Diffuser Length Approx. 274 mm Outer Diameter Approx. 64 mm Weight ~400 g Membrane Material EPDM Rubber Body Material ABS or Reinforced Compound Plastic Connection Size PT ¾" or PT 1" Female Thread Air Flow Rate Range 30 – 150 L/min Operating Temperature 0°C – 80°C (approx.) Bubble Size Fine bubbles (1 – 3 mm) Oxygen Transfer Efficiency High (fine bubble aeration) Pressure Loss Low Backflow Prevention Yes (integrated design) Installation Type Mounted on air manifold or header Typical Applications Wastewater treatment, SBR systems, aquaculture aeration, sludge digestion, industrial effluent treatment Maintenance Easy membrane replacement; low clogging risk Design Features Wide-space design to prevent blockage; uniform air distribution Country of Origin Taiwan / Imported by Indian Carbon Certifications ISO 9001 / CE Compliant (if applicable) |
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Here is adetailed description of the LONGTECH Fine Bubble Tube Diffuser – ModelLTF-275 (also listed by various manufacturers
Product Overview
The
LTF-275 is a fine-bubble tube diffuser designed for aeration applications in
wastewater treatment basins, activated sludge systems, aquaculture aeration
tanks and other submerged aeration systems. It is a part of the LONGTECH LTF
series of tube diffusers, which include larger models (for example LTF-550) but
the LTF-275 is the smaller/compact model in the series
In
essence, the product consists of an elongated cylindrical body with a
fine‐bubble membrane (typically made of EPDM rubber) mounted over a support
body (often ABS resin or compound reinforced plastic) with a threaded
connection (female PT-¾″ or PT-1″) that allows it to be mounted on an air
manifold and supply compressed air. It is engineered to produce a high density
of very small bubbles (fine bubbles) into water, thereby enabling high oxygen
transfer efficiency (OTE) while maintaining relatively low pressure loss and
good resistance against fouling and clogging.
Key Specifications and Construction Details
Model
& Size
- Model: LTF-275.
- Nominal ventilation
(airflow) volume: approximately 30 L/min up to about 150 L/min
(standard ventilation volume range for LTF-275) as indicated in the
specification sheet.
- Dimensions (approximate):
Body length “A” around 274 mm; outer dimension “B” around 304 mm;
thickness “C” approximately 64 mm
- Connection size: PT-1″ or ¾″
female (threaded).
- Weight: Approximately 400 g
(for that particular model).
- Materials: Body typically
EPDM membrane; connection or body housing ABS or reinforced compound
plastic. For the LTF series: “Body EPDM, Connection ABS or Compound rein”.
Construction & Membrane
- The diffuser uses an EPDM rubber membrane which is injection-moulded to consistent thickness and thickness uniformity. This rubber membrane is designed for high tenacity
(i.e., high mechanical strength) and good deformation resistance so that
it performs reliably during many cycles of inflation and deflation.
- The support body provides a
stable base and includes the air inlet thread connection; design
emphasises light weight and simple installation.
Features & Performance Benefits
High
Oxygen Transfer Efficiency (OTE)
Because the diffuser produces many fine bubbles and has
a large effective surface area (via the membrane perforations), it achievesgood oxygen transfer into the water. According to the manufacturer, the
fine-bubble tube diffuser (LTF series) has “high oxygen transfer efficiency”. Fine
bubble diffusers in general have the advantage of small bubble size (often 1–3
mm or smaller) which increases bubble residence time, contact area and thus
mass-transfer of oxygen.
Low
Pressure Loss & Energy Efficiency
The design emphasises low head loss: the membrane and diffuser configuration
allow air to be distributed without very high back-pressure. A lower pressure
drop means lower blower/air-supply energy costs for a given aeration duty.
Durability
& Anti-clog Performance
- “Wide space between filters,
no blockage” – as noted in the feature list for the LTF series. en.goldentech.com.tw
- Good resistance to fouling
and clogging of the membrane or air outlet holes is a major advantage in wastewater/aeration applications.
- Materials like EPDM provide
chemical resistance, good wear life, and can resist degradation in typical
aeration tank environments.
Easy
Installation & Maintenance
- The diffuser is relatively
light weight (e.g., around 400 g for LTF-275) and simple to install via
threaded connection to air manifold or header.
- The simple construction
makes replacement or maintenance straightforward.
- Because of the membrane
design, maintenance intervals may be longer compared to older
coarse-bubble systems.
Versatility
The product is suitable for a range of applications: municipal wastewater
treatment plants, industrial effluent biological treatment, aquaculture
aeration systems, activated sludge basins, sequencing batch reactors (SBRs),
and other submerged aeration basins.
Typical Applications & Operational Use
Applications
include:
- Biological wastewater
treatment basins (activated sludge, aerobic treatment)
- Sludge digestion tanks
(aerated digesters)
- Aquaculture ponds and
fishery aeration systems (where oxygen supply and mixing are important)
- Greywater recycling systems
or other aerated process tanks
- Contact aeration
or aerobic contactors in industrial wastewater plants
Operational
considerations:
- Air supply: The diffuser
must be supplied with clean, dry, oil and moisture-free compressed air via
a blower or compressor system, sized to deliver the required airflow (in
L/min or m³/h) for the basin characteristics and diffuser layout.
- Manifold layout: The
diffusers are typically mounted on an air header or manifold grid, spaced
evenly across the tank floor (or suspended if required) to promote uniform
bubble distribution and mixing.
- Placement: For best oxygen
transfer, install at the tank bottom or at a depth where bubbles can
travel a sufficient distance to transfer oxygen before reaching the
surface.
- Maintenance: Periodically
inspect for membrane damage, fouling, or blockage of the perforations.
While fine-bubble diffusers are less prone to crotch/fouling than some
older designs, good maintenance still improves performance.
- Cleaning/back-flushing: In
some systems, periodic back-flushing or flushing of membranes may extend
life and maintain performance.
- Replacement: Because the
LTF-275 is modular, individual diffusers can be replaced without major
disruption.
Advantages Over Other Diffuser Types
When
compared with coarse-bubble diffusers or mechanical surface aerators, the
LTF-275 fine bubble tube diffuser offers several advantages:
- Higher oxygen transfer per
unit air supplied — fine bubbles have higher surface area and
slower rise velocity, thus better oxygen dissolving.
- Better mixing and more uniform
oxygen distribution — the bubble plume from many small pores
tends to disperse oxygen more evenly across the tank.
- Lower noise and energy
consumption
when designed correctly.
- Compact size and ease of
retrofitting into
existing tanks due to its relatively small footprint.
- Reduced sludge and shorter
retention times in
some cases because of improved aeration efficiency.
Design & Installation Tips (for Users)
- Spacing & layout: Make sure diffusers are
evenly spaced and air manifold designed for equal pressure and flow to
each diffuser to avoid zones of low aeration.
- Depth of installation: The deeper the diffuser
within reason, the longer bubbles remain in the water column and the
higher oxygen transfer. Ensure the diffuser can handle the hydrostatic
head at the intended depth.
- Manifold material and
corrosion resistance: Use manifolds and supports resistant to the
process water conditions (corrosion, chemical attack).
- Air quality: Ensure blowers supply
clean air (moisture-free, oil-free) to avoid fouling membranes and
decreasing life.
- Periodic monitoring: Regularly check bubble
patterns—fine bubble diffusers should produce many fine bubbles rather
than large coarse ones. If bubbles appear too large, check for clogging,
membrane damage or low air pressure.
- Replacement planning: While EPDM membranes are
durable, over time membranes may fatigue; consider stocking spare units
for quick replacement to minimise downtime.
- Ensure back-flow
prevention: Some designs include a back-flow prevention function (when air
supply is off water cannot flow back through the diffuser). This helps
prevent sludge from entering the diffuser. The LONGTECH spec mentions
“high plankton containment” and design to avoid backflow of sludge.
Limitations and Considerations
- Fine bubble diffusers are vulnerable to fouling or blockage from solids, biological growth or scaling.
Although the LTF series addresses this (“wide space between filters, no
blockage”), the risk remains in heavily loaded tanks with high suspended
solids.
- Air supply pressure drop: While low pressure loss is
claimed, the air distribution system still needs to be carefully
engineered to avoid excessive blower load or uneven flow.
- Requires sufficient water
depth:
For the fine‐bubble benefit (prolonged bubble travel and oxygen transfer)
the diffuser should be installed at sufficient depth; in shallow tanks the
benefit may be reduced.
- Maintenance access: In large tanks it may be
challenging to access diffusers for inspection or replacement; plan
accordingly in the tank layout.
- Material compatibility: While EPDM is very good
for many wastewater conditions, extremely aggressive chemical environments
may shorten life and alternative membranes or diffusers may be required.
Summary
TheLONGTECH LTF-275 fine bubble tube diffuser is a high-efficiency, lightweight,compact aeration device specifically designed for fine bubble aeration
applications in water and wastewater treatment, aquaculture and other submerged
aeration systems. With its high oxygen transfer efficiency, low pressure loss,
durable EPDM membrane and straightforward installation, it is an excellent
choice when space is limited or retrofits are required.
Its
compact size (approx 274 mm length, ~400 g weight) allows flexibility in
installation; the specified airflow range (~30–150 L/min) and threaded
connection make manifold design simpler. The manufacturer emphasis on features
like “wide space between filters, no blockage” and “high plankton containment”
show that long‐term reliability in process conditions was considered.
In
practical use one should ensure proper air supply, manifold design, even
spacing, adequate tank depth, and plan for maintenance. When used and
maintained appropriately, the LTF-275 can contribute to more efficient
aeration, lower energy consumption and improved oxygenation in biological
treatment processes.
If
you like, I can pull together a full datasheet (including performance
curves, head‐loss vs air flow data, bubble size distribution, longevity test
data) for the LTF-275 from the manufacturer or distributor (if available) and
adapt it to design guidelines for local conditions in Bangladesh. Would you
like that?
| Fine Bubble Tube Diffuser (LTF-275) | Product Name Fine Bubble Tube Diffuser (LTF-275) Model LTF-275 Type Fine Bubble Tube Diffuser Manufacturer / Brand LONGTECH / Indian Carbon Diffuser Length Approx. 274 mm Outer Diameter Approx. 64 mm Weight ~400 g Membrane Material EPDM Rubber Body Material ABS or Reinforced Compound Plastic Connection Size PT ¾" or PT 1" Female Thread Air Flow Rate Range 30 – 150 L/min Operating Temperature 0°C – 80°C (approx.) Bubble Size Fine bubbles (1 – 3 mm) Oxygen Transfer Efficiency High (fine bubble aeration) Pressure Loss Low Backflow Prevention Yes (integrated design) Installation Type Mounted on air manifold or header Typical Applications Wastewater treatment, SBR systems, aquaculture aeration, sludge digestion, industrial effluent treatment Maintenance Easy membrane replacement; low clogging risk Design Features Wide-space design to prevent blockage; uniform air distribution Country of Origin Taiwan / Imported by Indian Carbon Certifications ISO 9001 / CE Compliant (if applicable) |
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