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Compact superficial DAF clarifier with 5–10 min retention time, >90% algae & SS removal rate. Prefabricated modular design, overhead installation available. Ideal for waterworks, textile, petrochemical, pulp & paper fiber recovery. Get your free wastewater solution now.
Loren LCD Series Superficial (Shallow) DAF Clarifier
High-Efficiency Dissolved Air Flotation System | Capacity 10–1000 m³/h
Product Highlights–Why Choose Loren LCD Serial Superficial DAF?
- Clarifies water in as little as 3 minutes — retention time only 5–10 min
- Over 90% removal of algae and suspended solids
- Shallow 750–950 mm effective depth,
- Surface Loading 6–8 m³/m²·h
- Floated sludge thickened to up to 35% solids
- Versatile Flow Range :Model Cover from 10-1000 M3 per hour
- Compact prefabricated design — overhead or multi-layer installation, no operating room needed
- Anti-clogging LDA dissolved air system, up to 90% dissolution efficiency
- Integreated All-in-one Unit: Module with Flocculation, Flotation , Skimming, Tube Mixer , Discharge and full Auto Control System
1. Product Overview
The Loren LCD Series Superficial DAF is an advanced quick-speed flotation system that integrates flocculation, flotation, skimming and sludge scraping in one compact circular tank. Built on proven flotation theory, it successfully applies the “shallow theory” and the “principle of zero speed” to deliver separation performance far beyond conventional rectangular DAF units.
Pressurized, air-saturated water is released into the tank, generating micro-bubbles that attach to flocculated solids. The buoyant floc–bubble aggregates rise to the surface within minutes and are continuously skimmed off, while clarified water is drawn from below — all in a single 3–10 minute pass.
2. How It Works
2.1 Shallow Theory
Reducing the effective water depth to 750–950 mm shortens the distance bubbles must travel. Micro-bubbles reach the surface in seconds regardless of tank diameter, so capacity is scaled by diameter rather than depth — huge throughput in a shallow basin.
2.2 Zero-Speed Principle
The raw water inlet and purified water outlet are mounted on a slowly rotating rack (1/5–1/10 rpm). Because the distribution and collection hardware moves in step with the water flow, the tank water remains almost static. With no cross-current to disturb rising flocs, solids float vertically to the surface at full speed and purification is completed within 3 minutes.
2.3 Integrated Structure
The cylindrical unit comprises a flotation tank, rotating water distributor, dissolved air release system, rotating rack, water collection device, scum skimmer, LDA dissolved air system, reflux piping and electric cabinet. Centralized and decentralized control options are available to suit any plant setup.
3. Process Flow Diagram
Show how a High Rate Shallow DAF clarifier works
4.Key Advantages
| Advantage | Benefit to You |
| Ultra-Fast Clarification (5–10 min HRT) | Up to 3 Times the throughput per m² of Conventional dAF |
| Shallow 750–950 mm Effective Depth | Small Footprint; Install Overhead Or
Stack In Multi Layers |
| >90% SS and Algae Removal | Consistently Meets Stringent Discharge And Potable-Water Standards |
| Sludge concentrated To 35% Solids | Dramatically Lower Sludge Volume and
De-watering Cost |
| Anti-Clogging LDA Dissolved Air System | Up to 90% Dissolution Efficiency,
1/5 The Volume, 24/7 Stability |
| All-Prefabricated, Lightweight Assembly | Short Days to Install, Low Civil Cost, Easy To Clean And Maintain |
5. Applications
-Drinking water and waterworks: algae, kelp and turbidity removal from natural lakes and rivers.
-Industrial wastewater: petrochemical, textile and dyeing, electroplating, tanning, food and beverage.
-Pulp and paper: white-water fiber recovery, recycling valuable fiber while clarifying process water.
-Oily water: grease and oil removal for refineries and food processing plants.
-Municipal Waterworks: Algae, seaweed and turbidity removal for lake / river raw water
-Petrochemical Wastewater Treatment
-Textile, Printing & Dyeing Wastewater
-Electroplating Wastewater
-Tannery Sewage
-Food & Beverage Industrial Wastewater
6. Main Technical Data
| Item | Parameter | Item | Parameter |
| Capacity | 10–800 m³/h | Reflux Ratio | 30% |
| Tank Depth | 900–1,100 mm | Dissolved Air Pressure | ≥ 0.4 MPa |
| Effective Water Depth | 750–950 mm | Rotating Speed | 1/5–1/10 rpm |
| Retention Time (HRT) | 5–10 min | Surface Loading | 6–8 m³/m²·h |
| SS / Algae Removal | >90% | Sludge Concentration | up to 35% |
7.Model Selection Guide
| Model | Tank Diameter (m) | Capacity (m³/h) | Total Power (kW) |
| LCD-10 | Φ2 | 5–10 | 4.45 |
| LCD-30 | Φ3 | 20–30 | 5.6 |
| LCD-50 | Φ4 | 40–50 | 11.2 |
| LCD-70 | Φ5 | 60–70 | 15.8 |
| LCD-100 | Φ6 | 80–100 | 19.8 |
| LCD-150 | Φ7 | 120–150 | 19.8 |
| LCD-200 | Φ8 | 180–200 | 29.7 |
| LCD-300 | Φ10 | 280–300 | 39.2 |
| LCD-400 | Φ11 | 350–400 | 39.2 |
| LCD-500 | Φ12 | 450–500 | 57.7 |
| LCD-700 | Φ14 | 650–700 | 67.7 |
| LCD-800 | Φ15 | 750–800 | 91.2 |
Note: Custom capacities and steel-structure or concrete-pool configurations are available. Total power includes drive motor, skimmer, pump and air compressor. Dimensions subject to final confirmation.
8.Frequently Asked Questions
What is a shallow (superficial) DAF clarifier?
A dissolved air flotation unit with only 600–950 mm effective water depth. Combined with the zero-speed principle, it clarifies water in 3–10 minutes instead of the 30+ minutes required by conventional DAF tanks.
Why does the zero-speed design matter?
The rotating distributor and collector move at nearly the same speed as the water, keeping the tank water virtually static. Flocs rise vertically without disturbance, reaching the surface in as little as 3 minutes.
What removal efficiency can be expected?
Over 90% removal of algae and suspended solids, with floated sludge thickened to up to 35% solids.
What makes the LDA dissolved air system special?
Up to 90% air dissolution efficiency, one-fifth the volume of conventional systems, and superior anti-clogging ability for continuous stable operation.
Is it suitable for my application?
The LCD series serves drinking-water plants, petrochemical, textile and dyeing, electroplating, tanning and food wastewater, as well as fiber recovery in the pulp and paper industry. Share your water quality data and our engineers will confirm the sizing.
What is the difference between superficial shallow DAF and conventional DAF? Superficial shallow DAF uses shallow theory and zero-speed principle. Shallow tank, short HRT (5–10 min), much smaller footprint, modular prefabricated, overhead installation available. Conventional DAF requires deep tank, longer retention time and larger civil work investment.
What wastewater can LCD superficial DAF treat?
It handles raw lake/river water with algae and turbidity, textile printing dyeing wastewater, petrochemical, electroplating, tannery, food wastewater, and pulp paper wastewater for fiber recovery.
What is the SS removal efficiency of Loren LCD superficial DAF?
Algae and suspended solids removal rate >90%. Thickened sludge concentration can reach up to 35%, which reduces sludge dewatering workload.
Is this DAF easy to install?
Yes. Fully prefabricated modular assembly, light load. It can be installed overhead or stacked in multi-layer layout, perfect for plant renovation projects with limited floor area.
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Request a Quotation to Get Your DAF Solution
Need compact high-efficiency DAF for your waterworks or industrial wastewater plant? Loren LCD Superficial Shallow DAF cuts footprint and reduces running cost. Request a free technical proposal now.
Send us your flow rate and water quality data — receive capacity selection, layout drawings and budget pricing within 24 hours.
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