OilGas DAF Clarifier for Petrochemical Wastewater

Dissolved air flotation description

Dissolved Air Flotation (DAF) units play a pivotal role in modern wastewater treatment processes. These units are designed to remove suspended solids, oils, and other contaminants from wastewater by injecting air into the water under pressure. Once the pressure is released, tiny air bubbles interact with the suspended particles, causing them to float to the surface where they can be easily skimmed off. This process results in the production of clarified water which is then directed to the bottom of the flotation chamber and collected at an effluent control weir. By efficiently separating impurities, DAF units enhance the quality of treated water and ensure compliance with stringent environmental regulations.

Dissolved air flotation principle

Dissolved Air Flotation is a fairly simple technology using pressurised air to remove small solids, oils, and greases from wastewater. The physical process happens as follows:
Pressurised air is mixed with pressurised water. Due to the higher pressure, more air is able to dissolve into the water. Pumps with a high energy output are able to achieve complete air saturation of the water.
The pressure control valve causes the high pressure to drop to low. The resulting drop in pressure means that the water is now suddenly over-saturated (supersaturated) with air.
The excess air molecules start to cluster together at existing nucleation sites such as small particles or longer-chain molecules, or surface-active molecule. Since the water is supersaturated instantaneously, the clusters of air molecules stay small, forming very small bubbles.
Buoyancy now causes the bubbles to rise, taking the contaminants with them. Generally, the surface tension of the water keeps particles incased in bubbles once they reach the top of the tank, causing a foam to form which can be easily removed.

Dissolved air flotation technical sheet

Dissolved air flotation process flow

Dissolved air flotation advantage

Beyond their application flexibility, DAF units offer significant advantages including high removal efficiency, low operating costs, flexibility in operation, and a compact footprint. This makes them a viable solution even for facilities with space constraints or those looking to upgrade their existing wastewater treatment infrastructure. However, it’s important to note that the complexity of these systems often necessitates skilled operators to manage and maintain optimal performance. Proper pre-treatment steps such as Coarse Screening, homogenization, sand removal, and coagulation-flocculation are also essential to ensure maximum efficiency and longevity of the DAF units.

Dissolved air flotation feature

Dissolved Air Flotation systems have solidified their place as an indispensable tool in modern water treatment processes. Their ability to efficiently remove suspended solids from diverse wastewater streams makes them particularly valuable across industries with stringent water quality requirements. As technological innovations continue to evolve, DAF systems are poised to become even more cost-effective and environmentally sustainable, bolstering their role in the global effort to safeguard water resources.

Dissolved air flotation application

Dissolved-air flotation processes have diverse applications across multiple industrial settings. Common industries benefiting from DAF technology include:

Food and Beverage: The food processing industry utilizes DAF systems to treat wastewater containing high concentrations of fats, oils, and food particles.
Pulp and Paper: DAF is employed to handle process water and to remove suspended solids, enhancing the quality of effluents.
Petroleum and Petrochemical: In these sectors, DAF systems act to remove oils and greases from produced water, significantly reducing environmental impact.
Wastewater Treatment Plants: Municipal treatment facilities use DAF to optimize sludge management and enhance overall treatment efficiency.

Contact Us for a Consultation

• Company: Wuxi Dajiang Environmental Technology Co., Ltd.  DAGYEE
• Phone/WhatsApp:+8613961861780
• Email: info@dagyee.com
• Website: www.dagyee.com