LF Series Efficient Horizontal Flow Dissolved Air Flotation Machine
Introduction:The LF series horizontal flow dissolved air flotation machine is a core pretreatment wastewater treatment unit widely used to remove suspended solids, grease and colloidal contaminants from industrial and municipal wastewater. When matched with water filter housing and self-cleaning filter in a complete wastewater treatment train, it delivers stable solid-liquid separation, cuts organic load for downstream biochemical tanks, and reduces the risk of pipeline and membrane blockage. It is a compact, low-investment automated solution for petrochemical, textile, papermaking, slaughter and food processing wastewater projects.
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Product Introduction
This LF series efficient horizontal flow dissolved air flotation machine functions as a reliable water filter housing supporting wastewater pretreatment, and can be combined with self-cleaning filter to build a multi-stage purification system for different water quality scenarios. The horizontal dissolved air flotation equipment works by injecting air into wastewater and breaking air into tiny dispersed bubbles, which act as carriers to attach suspended particles, oil droplets and colloids inside the water. These bubble-particle aggregates float upward to form foam or scum layer, realizing three-phase separation of gas, water and solid or oil. The separated scum is continuously scraped out by the automatic slag scraper, while heavier sediment sinks to the bottom sludge hopper. Independent sludge discharge pipes are configured for each hopper, which discharge sludge separately without interference and guarantee stable sludge concentration.
This equipment is the primary pretreatment facility for feed water, industrial wastewater and urban sewage. It has been extensively adopted in petrochemical, coal mining, papermaking, printing and dyeing, slaughtering, brewing and other industries. It achieves 40%~50% COD removal rate and over 90% SS removal rate. Different from traditional flotation and sedimentation tanks, this integrated design combines flocculation, air flotation and sludge collection in one single tank body. It greatly saves civil engineering investment and occupied floor space. The whole unit features low initial investment, small footprint, high automation level and easy daily operation and maintenance. The air compressor can adjust bubble size flexibly to optimize coagulation efficiency according to the property of incoming wastewater. Multiple standard models are available from LF-30 to LF-100 to cover treatment capacity ranging from 30 m³/h up to 100 m³/h. We also supply matching automatic slag scraping machines with multiple width specifications to adapt to different tank sizes.
The tank body is usually fabricated from carbon steel with anti-corrosion coating or stainless steel material, with strong structural stability and long service life. All core auxiliary parts including dissolved air tank, releaser, air compressor, scraper drive assembly and dosing mixing chamber are pre-assembled on the tank, which shortens on-site installation and commissioning cycle. The whole system can run continuously with unattended operation after parameter setting. The modular design makes it easy to expand or integrate into existing wastewater treatment lines without large reconstruction of the workshop.
Working Principle
Raw wastewater and prepared chemical agents are fully mixed inside the reaction tank first, then the mixed liquid flows into the contact chamber. Inside the dissolved air tank, compressed air and water are blended to form saturated dissolved air water. The dissolved air water passes through the releaser and undergoes pressure reduction, releasing a large quantity of fine microbubbles with particle size between 20 μm and 40 μm into the wastewater.
These tiny bubbles have large specific surface area and good adhesion performance. They stick firmly to suspended solids, oil particles and colloidal impurities in the wastewater. After attaching bubbles, the apparent density of contaminants becomes lower than water density, so they float upward to the water surface and form dense scum layer. The automatic traveling scraper moves along the tank surface at a stable speed, scraping the floating scum into the scum hopper and discharging it out of the system.
Particles with density higher than water will sink to the bottom sludge hopper instead of floating up. Each sludge hopper is equipped with an independent sludge discharge pipeline, which discharges sludge separately. This separate discharge design avoids mutual disturbance between different sludge zones and maintains consistent sludge concentration. The air compressor can adjust bubble size dynamically. Proper bubble size matches the floc size perfectly, maximizing coagulation and separation efficiency. The machine integrates flocculation, sedimentation and air flotation functions, which simplifies the wastewater treatment process and reduces the overall footprint and construction cost.
Technical Parameters
Main Unit Parameters of LF Horizontal Flow Dissolved Air Flotation Machine
| Model | Treatment Capacity (m³/h) | Dissolved Air Water Flow (m³/h) | Main Motor Power (Kw) | Drive Power (Kw) | Air Compressor Power (Kw) | Dissolved Air Tank Size (mm) | Overall Dimension (L × W × H, mm) |
|---|---|---|---|---|---|---|---|
| LF-30 | 30 | 6-10 | 5.5 | 0.37 | 2 | Φ500×1500 | 6000×2500×2000 |
| LF-40 | 40 | 8-13 | 5.5 | 0.55 | 2 | Φ600×1800 | 6000×2500×2000 |
| LF-50 | 50 | 15-20 | 5.5 | 0.55 | 2 | Φ600×1800 | 7000×2500×2000 |
| LF-60 | 60 | 18-27 | 7 | 0.55 | 2 | Φ600×1800 | 7500×3000×2400 |
| LF-70 | 70 | 22-30 | 7 | 0.55 | 2 | Φ650×2000 | 8000×3000×2400 |
| LF-80 | 80 | 24-32 | 10 | 0.55 | 2 | Φ650×2000 | 9000×3000×2400 |
| LF-100 | 100 | 30-35 | 15 | 0.55 | 3 | Φ700×2500 | 10000×3000×2600 |
Core Advantages
1. High removal efficiency
SS removal rate exceeds 90%, COD removal reaches 40%~50%, effectively reducing organic and suspended load for subsequent biochemical treatment units.
2. Integrated compact layout
Flocculation, air flotation and sludge collection are combined in one tank, small footprint and low civil construction cost.
3. Independent sludge discharge design
Separate sludge discharge pipe for each hopper, no cross interference, stable sludge concentration and convenient sludge treatment.
4. Adjustable bubble system
The air compressor can adjust bubble size freely to match different floc and wastewater characteristics, guarantee stable separation effect.
5. High automation
Automatic traveling scraper runs continuously, automatic slag scraping and discharging, less manual operation required.
6. Wide adaptability
Suitable for oily wastewater, printing and dyeing wastewater, slaughterhouse wastewater, papermaking wastewater and municipal sewage.
7. Complete matching series
Multiple main machine models and supporting scraper widths are available, easy to select according to project flow and tank size.
8. Simple maintenance
The internal structure is reasonable, wearing parts are few, replacement and inspection of releaser, air compressor and scraper components are convenient.
Application Scenarios
1. Petrochemical & coal industry
Oil-containing wastewater produced in oil extraction, refining and coal washing process contains large amounts of mineral oil and fine suspended coal powder. The LF dissolved air flotation machine removes oil slick and coal particles efficiently, protecting downstream biochemical tanks and preventing oil contamination of activated sludge.
2. Papermaking industry
Paper-making white water contains fiber, filler and colloidal substances. Air flotation recycles fiber resources and reduces SS and COD, realizing white water reuse and discharge compliance.
3. Printing and dyeing industry
Dyeing wastewater carries pigments, surfactants and floating fibers. The flotation unit removes chroma and suspended solids, improves the biodegradability of wastewater and reduces the burden of decolorization and biochemical treatment.
4. Slaughtering and brewing industry
High-concentration organic wastewater from slaughter, food fermentation and brewing contains animal fat, protein flocs and suspended solids. The machine removes grease and flocs to avoid fat crusting and blocking in subsequent pipelines.
5. Municipal sewage and feed water pretreatment
Used as primary pretreatment equipment for urban sewage and raw water, it intercepts floating impurities and reduces the load of sedimentation tank and filter system.
6. Other industrial fields
Surface treatment, mechanical processing, food factory, grease processing and other industries with oily and high-suspended wastewater.
Selection Guide
When selecting the LF horizontal flow dissolved air flotation machine, the first factor is the design wastewater treatment flow rate. You need to confirm the hourly average water volume and peak flow, then select the matching model from LF-30 to LF-100.
Second, check the wastewater characteristics: oil content, SS concentration, pH value and temperature. For high oil and high SS wastewater, it is recommended to reserve a safety margin for the treatment capacity.
Third, confirm the tank width to select the matched slag scraper. The scraper width must match the effective width of the flotation tank to ensure full coverage of scum surface.
Fourth, confirm site layout and civil engineering space. Check the length, width and height of the equipment to make sure the workshop and foundation can accommodate the unit.
Fifth, confirm material requirement. Carbon steel with anti-corrosion coating is the standard option; stainless steel 304 or 316L is recommended for corrosive wastewater such as acidic and alkaline dyeing wastewater.
If the project requires higher precision filtration after air flotation, users can configure water filter housing and self-cleaning filter as post-treatment equipment to form a complete wastewater pretreatment process.
FAQ
Q1: What contaminants can this horizontal dissolved air flotation machine remove?
A: It mainly removes suspended solids, oil, grease and colloidal substances in wastewater. The SS removal rate can reach over 90%, and COD removal rate is 40%~50%.
Q2: What is the working principle of the microbubble?
A: Dissolved air water releases 20~40μm microbubbles after pressure relief. Bubbles attach to particles and reduce the density of contaminants so they float up to form scum.
Q3: Can the scraper and main machine be purchased separately?
A: Yes. We supply the LF flotation main unit and matching slag scrapers with multiple width specifications for separate selection.
Q4: What is the difference between horizontal air flotation and vertical air flotation?
A: Horizontal flow type has longer residence time, better stability for large flow, easier scum collection and more convenient maintenance, which is widely used for industrial wastewater pretreatment.
Q5: Can this equipment work together with other filtration devices?
A: Yes. It can cooperate with water filter housing and self-cleaning filter to form a multi-stage wastewater treatment system for better outlet water quality.
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