YF unified air flotation device

• Product Overview

The integrated air flotation unit (also known as integrated air flotation equipment) is a high-efficiency solid-liquid separation system designed and manufactured by our company. This product integrates the dissolved air system, air release system, separation system, sludge scraping system, and electrical control system into a compact housing. By generating a large number of fine bubbles, it forms a "bubble-particle" complex with suspended solids in the water, utilizing buoyancy to rise to the surface for rapid separation. This provides a space-efficient, easy-to-install, and relatively simple-to-manage solution for removing oil, suspended solids, and certain colloidal substances from water.

• Structure and Working Principle

1. Core structural composition

The device adopts an integrated skid-mounted structure, primarily comprising:

• The dissolved air system, the core component, consists of a dissolved air tank, dissolved air pump, air compressor, and return pipeline. It dissolves air into part of the return water under high pressure to produce saturated dissolved air water.
• Contact zone and separation zone: The contact zone rapidly mixes the raw water with the released microbubbles; the separation zone provides sufficient retention time for the "floc-bubble" complex to float, with a collection pipe at the bottom to gather the clear water.
• The degassing device, typically positioned at the front end of the contact zone, functions as a pressure-reducing valve or specialized release mechanism. It causes a sudden drop in dissolved air water pressure, releasing a large number of fine microbubbles with a diameter of approximately 20-40 micrometers.
• Scraping system: The surface of the tank is typically equipped with chain-type or overhead crane-type scrapers, which continuously or intermittently collect the floating scum and transfer it to the sludge tank.
• Electrical control and dosing system (optional): The integrated control cabinet manages all components. A dosing unit can be installed as needed to add coagulants (e.g., PAC, PAM) for enhanced treatment efficiency.

2. Working Principle

• Solvent Dissociation and Release: After partial treatment, the clear water is pressurized by a recirculation pump and fed into the solvent dissociation tank. There, it fully dissolves with air injected by the air compressor under high pressure, forming dissolved air water. When this dissolved air water enters the contact zone through the gas release device, the pressure release generates a large number of microbubbles.
• Contact and Adhesion: Raw water (often mixed with chemicals) enters the contact zone simultaneously, where it is thoroughly mixed with microbubbles. During their ascent, the bubbles collide with suspended particles in the water (such as oils and flocs) and adhere to them through surface tension and van der Waals forces.
• Separation and Collection: Particles carrying air bubbles have a lower bulk density than water, rapidly rising to the surface to form a scum layer, which is removed by a skimmer. The separated clear water is discharged through the bottom collection pipe, while a portion is recirculated to the dissolved air system.
• Core technical features

1. Integrated design: The highly integrated multiple units in the traditional air flotation process feature compact structure and small footprint, which helps reduce civil construction workload and shortens installation period.
2. The dissolved gas efficiency is relatively stable: the pressure dissolved gas technology can produce fine and uniform bubbles, which have a large contact area with suspended matter. Combined with appropriate coagulation pretreatment, better separation effect can be obtained.
3. The system features high automation: The equipment can be configured with an automatic control system to achieve synchronized control of processes such as dissolved air, sludge scraping, and sludge discharge, making daily operation and management relatively simple.
4. The system has strong adaptability to the treatment load: by adjusting the reflux ratio, dissolved air pressure and chemical dosage, the system can cope with the fluctuation of influent water quality and quantity within a certain range.
5. Materials and Corrosion Resistance: The main body can be constructed from corrosion-resistant carbon steel or stainless steel (SS304) to accommodate various water conditions and ensure the equipment's service life.

• Main technical parameters

• Typical Application Fields

This device is suitable for various applications requiring solid-liquid or oil-water separation, offering distinct advantages in space-constrained or rapidly deployable projects.

• Industrial wastewater pretreatment:

• Food, meat, and oil processing wastewater: removal of animal and vegetable oils and suspended solids.
• Papermaking, textile, printing and dyeing wastewater: removal of fiber, dye particles and colloidal substances.
• Mechanical processing and painting wastewater: Remove suspended metal particles and some lubricating oil.
  • Municipal and domestic wastewater: Used for front-end oil separation of oily catering wastewater, or as a supplementary or alternative process to the primary sedimentation tank in wastewater treatment plants.
  • Water treatment: Used for the removal of algae and low-turbidity suspended solids in lake and reservoir water sources.
  • Recycling of useful substances: such as the recovery and utilization of fibers in papermaking white water.