DAF Catering Oily Wastewater Flotation Equipment Degreasing Water Treatment Equipment

DAF Catering Oily Wastewater Flotation Equipment for Degreasing Water Treatment

The DAF Catering Oily Wastewater Flotation Equipment is a wastewater treatment solution designed to remove oil, grease, fats, suspended solids, and other floatable contaminants from catering, restaurant, commercial kitchen, food service, and industrial wastewater. Using dissolved air flotation technology, the system generates fine air bubbles that attach to oil droplets and suspended particles, causing them to rise to the water surface where they can be mechanically skimmed and collected.

Catering and food service wastewater can contain significant concentrations of fats, oils, and grease (FOG), food particles, detergents, suspended solids, and organic matter. If inadequately treated, FOG can accumulate in pipes, pumps, collection systems, and wastewater treatment equipment. EPA notes that fats, oils, and grease can contribute to clogged pipes and pumps in sewer systems and wastewater treatment facilities.

DAF provides an effective physical separation stage before biological treatment, filtration, membrane treatment, or wastewater reuse.

Model NO.	GSRF	Handling method	physicochemical treatment
Usage	Industrial, agricultural, food factories, slaughterhouses	Trademark
Types	Package, Compact, Small, Mini	Applications	Industrial, Municipal, Domestic, Medical, Ship
Craft	Flocculation sedimentation method	Features	Water Clarification, Filtration, Purification
Service Life	20 Years	Operation	Automatic
Steel Plate Thickness	>8mm	Function	Remove Suspended solids
Voltage	220V/ 380V/ Customerized	Installation Type	Onground
Colour	Grey/Silver/Blue/Balck/Customerized	Use for	Mineral, Printing, Chemical, Dyeing, Starch
Material	Carbon Steel, Stain Steel, FRP, PE, PP	Certificate	SGS, ISO
Transport Package	Container Standard Packing	Specification	Carbon steel anti-corrosion
Production Capacity	1000 Sets/Year	Origin	China

How Does the DAF Flotation System Work?

The DAF process begins with wastewater entering the treatment system after preliminary screening or grease separation. Larger food particles and coarse solids may be removed before the DAF unit to protect pumps and downstream equipment.

Depending on the wastewater characteristics, coagulants and polymers can be added to destabilize fine particles and improve the formation of floatable flocs.

A portion of clarified water is typically recycled and pressurized with air. Under pressure, air dissolves into the recycle water. When the pressurized water passes through a pressure-release device and enters the flotation tank, the sudden pressure reduction causes the dissolved air to form numerous fine bubbles.

The bubbles attach to oil droplets, grease, suspended solids, and flocs. The resulting bubble-particle aggregates become buoyant and rise toward the surface. A mechanical skimmer removes the floating layer while clarified water flows from the DAF unit for further treatment.

EPA describes DAF as a process in which pressurized air is released to form fine bubbles that attach to oil and suspended particles and carry them to the surface.

Effective Catering Wastewater Degreasing

The DAF Degreasing Water Treatment Equipment is particularly suitable for wastewater containing fats, oils, and grease generated by commercial kitchens and food service operations.

Typical sources include:

Restaurant Kitchens
Hotel Kitchens
Catering Facilities
Commercial Food Preparation
Central Kitchens
Food Courts
Cafeterias
Food Processing Plants
Meat Processing Facilities
Dairy Operations
Poultry Processing
Food Distribution Facilities

DAF can separate free and dispersed oil and grease and can also help remove oil-wet suspended solids that are difficult to separate through gravity sedimentation.

EPA technical documents identify DAF as a commonly used process for removing suspended solids and dispersed oil and grease from oily wastewater.

FOG Removal From Food Service Wastewater

FOG is one of the main treatment concerns in catering wastewater. Fats and grease may enter wastewater from cooking, food preparation, dishwashing, equipment cleaning, and food residue.

A properly designed wastewater treatment process can use screening, grease separation, equalization, coagulation, DAF, biological treatment, and filtration as complementary stages.

DAF is especially useful after preliminary grease control when wastewater still contains dispersed oil, grease, fine food solids, and colloidal material.

The flotation process does not simply rely on gravity. Fine bubbles actively transport target particles to the surface, allowing rapid separation of suitable floatable contaminants.

Coagulation and Flocculation

Chemical conditioning can improve the performance of DAF when catering wastewater contains fine suspended solids, emulsified grease, or colloidal particles.

A typical chemical pretreatment system may include:

Coagulant Dosing → Rapid Mixing → Polymer Dosing → Flocculation → DAF Flotation

Coagulants help destabilize small particles, while polymers can promote the formation of larger flocs. These flocs can then interact with the rising microbubbles and be removed through surface skimming.

The appropriate chemicals and dosage depend on the wastewater composition. pH, temperature, oil concentration, suspended solids, detergent concentration, and food residue can all influence treatment performance.

For this reason, jar testing or pilot testing is recommended before finalizing a chemical dosing program.

Oil and Suspended Solids Separation

The DAF system can simultaneously target several contaminant groups.

These may include:

Free Oil
Dispersed Oil
Fats
Grease
Food Solids
Suspended Solids
Oil-Wet Particles
Flocculated Colloids
Floating Organic Material

Particles with a density close to water can be difficult to remove efficiently through conventional settling. DAF is particularly useful for these particles because bubble attachment changes their apparent buoyancy and accelerates their movement toward the surface.

Main Equipment Components

A complete Catering Oily Wastewater DAF System can include:

DAF Flotation Tank
Recycle Water Pump
Air Compressor
Air Saturation System
Pressurization Tank
Pressure Release Valve
Surface Skimmer
Sludge Collection Trough
Coagulation Tank
Flocculation Tank
Chemical Dosing System
Control Cabinet
Flow Meter
Pressure Instruments
Level Sensors

The actual configuration can be adapted according to wastewater flow, oil and grease concentration, suspended solids loading, available space, and required effluent quality.

Compact Wastewater Treatment Solution

Catering facilities often have limited space for wastewater treatment equipment. A compact DAF system can provide rapid flotation in a relatively small footprint compared with some conventional gravity separation arrangements.

DAF can also be configured as a packaged or modular treatment unit, allowing it to be installed as part of a new wastewater treatment plant or integrated into an existing system.

For larger wastewater flows, recycle pressurization can be used so that only a portion of the treated flow is pressurized and saturated with air. EPA technical documentation notes that pressurizing only the recycle stream can reduce the energy required compared with pressurizing the entire influent flow.

Integration With Complete Food Wastewater Treatment Plants

The DAF system can be combined with other wastewater treatment technologies.

A typical catering wastewater treatment process may be:

Bar Screen → Grease Trap → Equalization → Coagulation → Flocculation → DAF → Biological Treatment → Filtration → Disinfection

For more demanding water reuse applications, downstream ultrafiltration, MBR, activated carbon, or reverse osmosis can be added.

DAF is generally a separation and clarification process rather than a complete solution for all dissolved pollutants. EPA notes that air flotation does not significantly reduce most dissolved species, so additional treatment may be required depending on discharge or reuse requirements.

Skimming and Sludge Management

During flotation, separated grease, oil, food solids, and flocs accumulate at the water surface. A mechanical skimmer moves the floating material into a collection trough.

The collected float can then be transferred to a grease or sludge holding tank and subsequently handled through dewatering or disposal processes.

Timely skimming is important because excessive accumulation of surface sludge can eventually allow particulates to return to the water.

Some DAF configurations may also include bottom sludge collection for heavier particles that settle rather than float.

Operation and Maintenance

Routine maintenance helps maintain stable treatment performance.

Operators should inspect:

Recycle Pump
Air Compressor
Pressure Tank
Pressure Release Valve
Skimmer
Sludge Discharge
Chemical Dosing Pumps
Mixers
Sensors
Valves
Control Cabinet

Grease and food solids can accumulate on mechanical components, so regular cleaning is particularly important for catering applications.

Chemical dosing should be adjusted according to actual wastewater conditions rather than using a fixed dosage. Operators should also monitor flow rate, pH, influent oil and grease, suspended solids, and treated water quality.

Why Choose Us?

Choosing the right DAF Catering Oily Wastewater Flotation Equipment requires consideration of wastewater flow, peak loading, FOG concentration, suspended solids, detergents, chemical requirements, sludge characteristics, available space, and downstream treatment.

Our DAF solutions can be configured for restaurants, hotels, catering facilities, commercial kitchens, food processing plants, and industrial wastewater treatment systems.

Key advantages include:

Efficient Oil And Grease Removal
FOG Wastewater Treatment
Suspended Solids Separation
Fine-Bubble Dissolved Air Flotation
Compact Treatment Footprint
Optional Coagulation And Flocculation
Automatic Surface Skimming
Integrated Sludge Collection
Recycle Pressurization Options
PLC Automatic Control Options
Flexible Integration With Wastewater Treatment Plants

The final system configuration should be selected according to actual wastewater testing and required treatment performance.

FAQ
1. What is a DAF catering wastewater treatment system?

It is a dissolved air flotation system designed to separate oil, grease, fats, suspended solids, and other suitable floatable contaminants from catering and food service wastewater.

2. Can DAF remove kitchen grease?

Yes. DAF is suitable for separating dispersed fats, oils, grease, and associated suspended solids.

3. What is FOG?

FOG stands for fats, oils, and grease. These contaminants are common in restaurant, catering, food preparation, and food processing wastewater.

4. Can DAF replace a grease trap?

Not necessarily. A grease trap or grease interceptor can provide preliminary removal of large quantities of grease and solids, while DAF can provide additional treatment for finer dispersed oil, grease, and suspended solids.

5. Does DAF remove food particles?

Yes, DAF can remove suitable suspended and floatable food particles, particularly when they are small, light, or incorporated into chemically formed flocs.

6. Does DAF require chemicals?

Not always. However, coagulation and polymer treatment can improve the removal of fine solids, colloids, and emulsified grease.

7. Can DAF remove emulsified grease?

It can, but stable emulsified grease may require chemical conditioning or emulsion breaking before flotation.

8. Can DAF treat restaurant wastewater?

Yes. It can be used for restaurant, hotel, catering, cafeteria, commercial kitchen, and food processing wastewater.

9. What happens to the separated grease?

The floating grease and solids are collected by the surface skimmer and transferred to a collection or sludge handling system.

10. Can DAF be combined with biological treatment?

Yes. DAF can be used as pretreatment before biological processes to reduce oil, grease, and suspended solids loading.

11. Can DAF be used before MBR or RO?

Yes. DAF can provide pretreatment before UF, MBR, RO, and other advanced treatment systems.

12. How is the DAF system sized?

Sizing should consider average and peak flow, FOG concentration, suspended solids, wastewater temperature, chemical requirements, target effluent quality, and downstream treatment requirements.

Prev：Coal Mine Wastewater Treatment /Industrial Equipment/ Water Treatment Equipment
Next：Integrated Inclined Tube Sedimentation and Coagulation Tank for Wastewater Treatment Plant
TAG: Suspended Solids Removal, FOG Wastewater Treatment, DAF Grease Removal, Food Industry Wastewater Treatment, Food Processing Wastewater Treatment, DAF Wastewater Treatment System, Industrial Wastewater Treatment, Industrial Wastewater Treatment Plant, Wastewater Treatment Equipment, Wastewater Treatment Plant, Solid Liquid Separation Equipment, Wastewater Treatment System, Industrial Water Treatment, Industrial Water Recycling, Suspended Solids Removal Equipment, Oily Wastewater Treatment Equipment, Wastewater Recycling System, Water Reuse Treatment, Fats Oils And Grease Removal, Commercial Kitchen Wastewater Treatment, Restaurant Wastewater Treatment, Oil Removal Equipment, Oil Water Separator, Industrial Wastewater Pretreatment, DAF Sludge Removal, Primary Wastewater Treatment, DAF Clarification System, DAF Coagulation System, DAF Flocculation System, Microbubble Flotation,
Related Category:
DAF Catering Oily Wastewater Flotation Equipment,DAF Oily Wastewater Treatment Equipment,Catering Wastewater DAF System China, suppliers, manufacturers, factory, customized, wholesale, quotation, made in China