Air Flotation Machine

Industrial Air Flotation Equipment for Solid-Liquid and Oil-Water Separation

An air flotation machine is a specialized physical separation unit used in industrial wastewater treatment to remove suspended solids, fats, oils, grease (FOG), colloidal particles, and other low-density contaminants. By introducing fine air bubbles into the treated water stream, the equipment facilitates bubble-particle attachment, causing targeted contaminants to rise to the surface where a mechanical scraper removes the accumulated scum, leaving clarified water for discharge or reuse.

Dissolved Air Flotation Machine
Dissolved air flotation machines have the advantages of good treatment effect, convenient debugging, and labor saving. Considering the cost savings in labor and the effect, they are the best choice.
Shallow Air Flotation Machine
The Shallow Air Flotation (SAF) unit is a facility that operates on the dissolved air flotation principle, primarily designed for solid-liquid separation. Its working mechanism involves...
Micro-flotation Air Flotation Machine
The micro-floating air flotation machine is a new type of water treatment equipment developed based on the traditional dissolved air flotation technology.

Core Applications and Industry Verticals

Food & Beverage Processing:

Primary separation stage for high-load effluent from meat, poultry, dairy, and seafood processing facilities to reduce incoming contaminant loads.

Oil and Grease Removal:

Separation of free, dispersed, or emulsified oils from petrochemical wastewater, industrial washing operations, and oily process water.

Industrial Pretreatment:

Upstream reduction of total suspended solids (TSS) and FOG loading to protect downstream biological treatment processes from organic overload.

General Industrial Effluent:

Clarification of process water, textile wastewater, pulp and paper streams, and metal-processing wastewater.

Technical Sizing and Engineering Parameters

Flotation units must be selected based on comprehensive influent characteristics rather than nominal flow rates alone. Accurate sizing requires evaluating the following parameters:

Hydraulic Flow: Average flow rate, peak hourly flow, operating hours per day, and batch versus continuous operation to prevent hydraulic overloads.

Wastewater Load: Influent TSS, FOG concentration, chemical oxygen demand (COD), pH levels, and operating temperatures.

Bubble-Particle Characteristics: Particle size distribution and natural flotation behavior to determine if chemical conditioning is required.

Solids and Scum Handling: Expected sludge generation, scraper configuration, and discharge frequency.

System Integration and Process Train

Air flotation is typically deployed as a centralized stage within an industrial wastewater treatment plant. A representative process configuration follows this sequence:
Screening -> Equalization -> Coagulation -> Flocculation -> Air Flotation -> Biological Treatment -> Secondary Clarification

Essential Components of a Dissolved Air Flotation System

Flotation Tank:

Engineered geometry providing the effective surface area and hydraulic retention time necessary for optimal separation.

Air Dissolution System:

Pressurized saturation vessel that combines air and recycle water to generate microscopic bubbles upon pressure release.

Recycle-Water Loop:

Clarified water recirculation system designed to maintain proper air-to-solids ratios.

Flocculation Section:

Controlled-mixing zone for adding coagulants and polymers when treating fine colloids or emulsified materials.

Surface Scraper:

Mechanical mechanism tailored to collect and discharge floating scum efficiently.

Material Selection Guidelines

Construction materials are chosen based on wastewater chemistry, operating environment, and lifecycle requirements. Options include coated carbon steel for standard environments and various grades of stainless steel for corrosive applications involving high chloride concentrations, aggressive cleaning chemicals, low pH, or elevated temperatures.

Information Required for Project-Specific Quotations

Process Data: Wastewater source, average and peak flow rates, influent TSS, FOG, COD, pH, temperature, and required effluent quality.

Equipment Specifications: Required treatment capacity, tank configuration, material of construction, automation level, and control system requirements.

Site Conditions: Indoor or outdoor installation, available footprint, local ambient temperatures, and regional electrical standards.

FAQ

Q: What is an Air Flotation Machine used for?

A: It separates suspended solids, fats, oils, grease (FOG), colloidal particles, and other low-density contaminants from industrial wastewater by attaching them to micro-bubbles, which carry the pollutants to the surface for removal.

Q: Is an Air Flotation Machine the same as a DAF system?

A: Not entirely. "Air flotation machine" is a broad categorical term, whereas Dissolved Air Flotation (DAF) is a specific, widely used flotation process configuration that dissolves air into a pressurized recycle stream to generate fine bubbles.

Q: What wastewater characteristics are most suitable for air flotation?

A: Streams containing low-density solids, free or emulsified oils, and floatable particulate matter that resist efficient removal via conventional gravity sedimentation are ideal candidates.

Q: Does air flotation always require chemical conditioning?

A: No, but it is frequently required. Coagulants and flocculants are introduced upstream when treating fine suspended solids, colloids, or emulsified materials to aggregate particles and enhance bubble attachment.

Q: How is the capacity of a flotation machine correctly sized?

A: Sizing is determined by evaluating hydraulic flow rates, solids loading (TSS), oil and grease loading (FOG), chemical conditioning needs, and required effluent standards—relying on average flow rate alone is insufficient.

Q: Can an air flotation unit be integrated before biological treatment?

A: Yes. It is frequently deployed as a primary pretreatment step to slash high TSS and FOG loads, protecting downstream biological systems from organic shock and excessive sludge loading.

Q: What core technical details are required to request an accurate quotation?

A: At a minimum, provide the wastewater source, average and peak flow rates, influent TSS, FOG, COD, pH, operating temperature, and required final water quality standards.

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