5m3/H - 300m3/H Water Purification System DAF Dissolved Air Flotation Water

Product Specification

Dissolved Air Flotation (DAF) Water Filtration System

Product Overview

The Dissolved Air Flotation (DAF) Water Filtration System is a high-efficiency water clarification unit designed to remove suspended solids, oils, greases, algae, and other impurities from raw water or wastewater.
By utilizing microscopic air bubbles to float fine particles to the surface, the DAF system achieves superior solid-liquid separation efficiency compared to traditional sedimentation.
It is widely applied in industrial wastewater treatment, drinking water clarification, and pretreatment for membrane filtration systems.
The system features compact structure, automatic operation, and stable performance.

Working Principle

The DAF system operates on the principle of air flotation.
Water is first saturated with air under high pressure in a dissolved air tank. When released into the flotation tank at atmospheric pressure, the dissolved air forms tiny microbubbles (30–50 μm) that attach to suspended particles.
These air-particle aggregates float to the water surface, forming a scum layer that is continuously removed by a surface skimmer.
The clarified water flows out through the bottom outlet, while the sludge is discharged for further treatment.
The process can be enhanced by adding coagulants and flocculants upstream.

Main Components

• Flotation Tank — Made of carbon steel, stainless steel, or FRP with corrosion-resistant coating.

• Air Dissolving System — Includes an air compressor, dissolved air tank, and release nozzles.

• Recycling Pump — Pressurizes the recycled water to dissolve air efficiently.

• Chemical Dosing System — Optional coagulant/flocculant dosing unit to enhance flotation.

• Scum Scraper — Removes floated impurities automatically.

• Effluent Collection System — Ensures uniform water distribution and steady outflow.

• Sludge Discharge Valve — Periodically removes settled solids.

• PLC Control Cabinet — Automatic operation and protection control.

• Level Sensors and Flow Meters — For real-time monitoring and automatic adjustment.

Features

• High removal efficiency for suspended solids (SS), oil, algae, and color.

• Compact modular design, small footprint, and easy installation.

• Automatic air dissolving and release system with stable microbubble generation.

• Optional chemical dosing for improved coagulation and flotation efficiency.

• Low energy consumption and maintenance cost.

• Continuous operation with automatic sludge removal.

• Available in carbon steel epoxy-coated, stainless steel, or FRP materials.

Applications

• Surface water clarification (river, lake, reservoir water)

• Industrial wastewater (printing, papermaking, chemical, oil refinery, food processing, electroplating, etc.)

• Drinking water pretreatment and turbidity reduction

• Algae and oil removal in water treatment plants

• Pretreatment before ultrafiltration (UF), nanofiltration (NF), or reverse osmosis (RO) systems

• Municipal sewage plant primary clarification or tertiary polishing

Optional Configurations

• Material options: Carbon steel + epoxy / Stainless steel (SS304/SS316L) / FRP

• PLC + touchscreen control system with automatic data logging

• Chemical dosing system (PAC, PAM, or polymer)

• Dissolved air tank capacity customization

• Air compressor and recycling pump from selected international brands

• Skid-mounted or containerized unit for easy transportation

• Combined DAF + sedimentation or DAF + filtration integrated unit

• Online monitoring for SS, turbidity, and pH