Loren LRD Series Combined Dissolved Air Flotation Unit

The Loren LRD Series Rectangular DAF Machine is a combined Dissolved Air Flotation unit designed for efficient solid-liquid and liquid-liquid separation in industrial wastewater, municipal wastewater pretreatment, potable water treatment, and seawater desalination applications.

By generating fine micro-bubbles and allowing them to attach to suspended solids, oil, grease, flocs, and colloidal particles, the DAF system floats pollutants to the water surface. The floating scum layer is then removed by a skimmer, while clarified water flows out from the lower part of the tank.

Product Description

The Loren Rectangular DAF Machine adopts a horizontal flotation tank structure with an integrated dissolved air system, micro-bubble release system, skimming device, and control system. It is suitable for wastewater streams containing suspended solids, oil and grease, fibers, algae, colloids, and low-density particles.

The unit can be configured with optional reaction tanks, agitators, inclined plates, bottom hoppers, UF modules, EC modules, or media fillers to improve COD and TSS removal and reduce the load on downstream treatment processes.

Key Features

• Micro-bubble size typically below 30 μm, supporting efficient pollutant attachment
• Optional micro-nano bubble generator technology for finer bubble generation
• Low-pressure dissolved air operation with reduced energy consumption
• High dissolved air resolution and release efficiency, claimed up to over 99%
• Strong anti-clogging design for the dissolved air system
• Stable chain-plate skimmer for reliable scum removal
• Compact footprint, easy operation, and simple management
• Optional built-in reaction tank with agitator
• Optional inclined plates and bottom sludge hopper
• Optional UF, EC, or filler modules inside the DAF tank
• Customized design and budget options to meet diversified project requirements

Working Principle

1. Coagulation and Flocculation
   Coagulant and flocculant are dosed into raw wastewater to form larger flocs that can be captured by micro-bubbles.
2. Dissolved Air Generation
   Air from an air compressor or site air source is mixed with clean water in the dissolved air system under approximately 35 MPapressure to form dissolved air water. 1, 4, 11
3. Micro-bubble Release
   The dissolved air water is suddenly released into the DAF tank, generating large quantities of fine micro-bubbles.
4. Flotation and Separation
   Micro-bubbles attach to coagulated suspended solids, oil, grease, and flocs, causing them to float to the surface and form a scum layer.
5. Scum Removal and Clean Water Discharge
   The surface scum is skimmed by the scraper system. Clarified water remains below the scum layer and flows to the clean water outlet. Part of the treated water can be recycled to the dissolved air system.

System Composition

• Rectangular DAF tank
• Dissolved air system
• Micro-bubble release device
• Reflux water pipeline
• Chain-plate skimmer
• Sludge collection system
• Optional reaction tank with agitator
• Optional inclined plate module
• Optional bottom sludge hopper
• Electrical control cabinet

Technical Highlights

Final technical parameters should be confirmed according to actual wastewater quality, flow rate, temperature, oil content, SS concentration, and discharge requirements.

Model Selection Refers To That Of  LIRD Except Height

The Above Data Only For Reference , Please Subject To Our Final Confirmation

Applications

1. Industrial Wastewater Treatment

• Food and beverage wastewater
• Dairy wastewater
• Slaughterhouse wastewater
• Paper mill and pulp wastewater
• Textile, dyeing, and printing wastewater
• Tannery wastewater
• Petrochemical and petroleum wastewater
• Pharmaceutical wastewater
• Cement and steel industry wastewater
• Plastic and rubber industry wastewater
• Aquaculture wastewater
• Agricultural wastewater
• Other combined industrial wastewater

2. Municipal Wastewater

• Primary treatment before biological processes
• Biological sludge clarification
• Biological sludge thickening
• Tertiary treatment

3. Potable Water Treatment

• Surface water clarification
• Algae removal
• Pretreatment for drinking water systems

4. Seawater Desalination

• Pretreatment for desalination plants
• Removal of suspended solids, algae, and low-density particles

Advantages

• Compact structure:smaller footprint compared with conventional sedimentation tanks
• Energy-efficient design:low-pressure dissolved air operation
• High separation efficiency:effective removal of SS, oil, grease, flocs, and turbidity
• Stable operation:chain-plate skimmer ensures consistent scum removal
• Flexible configuration:can be combined with reaction tanks, inclined plates, UF, EC, or fillers
• Easy management:simple operation, stable performance, and reduced maintenance complexity
• Customizable solutions:design and budget can be adjusted according to project requirements

Process Flow

Raw wastewater → Coagulation and flocculation → DAF contact zone → Micro-bubble attachment → Flotation and separation → Surface scum skimming → Clarified water outlet → Part of water recycled to dissolved air system

FAQ

What is the Loren Rectangular DAF Machine?
It is a horizontal dissolved air flotation unit designed for solid-liquid and liquid-liquid separation in industrial, municipal, potable water, and desalination applications.

How does the LRD Series DAF unit work?
Air is dissolved into water under pressure, then released to generate fine micro-bubbles. The bubbles attach to suspended solids, oil, grease, and flocs, float them to the surface, and allow them to be removed by a skimmer.

What pollutants can this DAF system remove?
It can remove suspended solids, oil and grease, turbidity, colloidal matter, algae, and part of COD and BOD, depending on wastewater characteristics and process design.

Can this DAF machine be customized?
Yes. The system can be configured with different materials, capacities, reaction tanks, inclined plates, hoppers, UF modules, EC modules, and control systems.

What industries can use this DAF equipment?
It is suitable for food and beverage, dairy, slaughterhouse, paper mill, textile, petrochemical, pharmaceutical, aquaculture, municipal wastewater, drinking water pretreatment, and seawater desalination plants.

Note

The above data and descriptions are for reference only. Final design, capacity, material selection, and technical parameters shall be subject to final confirmation based on actual project conditions and wastewater analysis.