Above-Ground Domestic Sewage Treatment Equipment

Air Flotation Machine for Wastewater From Food Factory Pig Slaughter and Farming, Air flotation machine is a machine that uses small bubbles or small bubbles to surface impurities in the medium. This air flotation device can be used for small particles with a specific gravity close to that of water, which are difficult to sink or float due to their own weight.
In terms of water supply and drainage, the pre-treatment water quality, except for some raw water bodies with high sand content and sewage with heavy mechanical impurities, is mostly composed of lightweight suspended particles. For example, algae in lakes, reservoirs, and some rivers; Plant residues and small colloidal impurities; Dye particles in the printing and dyeing industry; Short fibers in the papermaking and chemical fiber industries; Microdroplets of petroleum and organic solvents in the refining and chemical industries; Heavy metal ions in electroplating and pickling wastewater; Electrophoretic paint wastewater, etc; They are lightweight particles with a specific gravity very close to that of water. For these raw water, if traditional sedimentation methods are used, the effect will inevitably be poor, especially in low temperature winter conditions, where coagulation and hydraulic conditions deteriorate, making it more difficult to ensure the treatment effect. It can be imagined that if it is difficult to settle flocs, forcing them to sink will inevitably result in half the effort. Instead, it is better to use the situation to artificially introduce bubbles into the water body, making them adhere to the flocs, thereby greatly reducing the overall density of the flocs, and using the speed of bubble rise to force them to float up, thus achieving rapid solid-liquid separation. In this sense, the emergence of air flotation technology is a revolution in the gravity sedimentation method, which has opened up new fields of solid-liquid separation technology.

Above-Ground Domestic Sewage Treatment Equipment, Air Flotation Machine for Food Factory, Pig Slaughter and Farming Wastewater

The Above-Ground Domestic Sewage Treatment Equipment with DAF Air Flotation Machine is an integrated wastewater treatment solution designed for domestic sewage and high-strength wastewater generated by food factories, pig slaughterhouses, livestock farms, and agricultural operations. The system combines practical above-ground installation with dissolved air flotation technology to help separate suspended solids, fats, oils, grease, floating matter, and other pollutants before downstream treatment.

Food processing, pig slaughtering, and farming activities can produce wastewater containing organic solids, animal fats, proteins, suspended particles, and other biodegradable materials. Slaughterhouse wastewater in particular can contain substantial suspended solids and oil and grease, making effective pretreatment important before biological treatment. Research on poultry slaughterhouse wastewater has shown DAF being used as a primary treatment stage before anaerobic biological treatment.

Above-Ground Sewage Treatment System

Unlike buried wastewater treatment systems, above-ground equipment can be installed on a prepared concrete foundation or equipment platform, making inspection, operation, maintenance, and equipment replacement more accessible.

The above-ground configuration is suitable for projects where operators need convenient access to pumps, flotation tanks, control cabinets, valves, skimmers, chemical dosing equipment, and other treatment components.

A complete treatment system can combine DAF with screening, equalization, coagulation, flocculation, biological treatment, filtration, disinfection, and sludge dewatering according to the actual wastewater characteristics.

For domestic sewage, DAF may be used as a pretreatment or solid-liquid separation stage. For food, slaughterhouse, and farming wastewater, it can serve as an important primary treatment process for removing floatable and suspended pollutants before biological treatment.

How the DAF Air Flotation Machine Works

The DAF system uses dissolved air flotation to separate pollutants from wastewater.

First, wastewater passes through preliminary screening to remove large solids. An equalization tank may then be used to balance variations in wastewater flow and pollutant concentration.

When chemical conditioning is required, coagulants and polymers can be introduced before flotation. These chemicals help destabilize fine particles and form larger flocs that can interact more effectively with air bubbles.

A portion of water is pressurized and saturated with air. When the pressurized water is released into the flotation chamber, the pressure drops and dissolved air forms numerous fine bubbles.

The bubbles attach to suspended particles, fats, oils, grease, and flocs. The resulting bubble-particle aggregates become buoyant and rise toward the water surface.

A mechanical scraper then collects the floating sludge and transfers it to the sludge collection area. Clarified water leaves the flotation chamber and proceeds to the next treatment stage.

EPA documentation describes DAF as particularly useful for removing small or lightweight particles, including grease, that can be difficult to remove by gravity settling alone.

Food Factory Wastewater Treatment

Food factories can generate wastewater containing food particles, fats, oils, grease, proteins, suspended solids, and biodegradable organic matter.

The DAF air flotation machine can be installed as a pretreatment unit to reduce the solids and FOG loading entering downstream biological treatment.

Typical applications include:

Meat Processing Plants
Food Processing Factories
Dairy Processing Facilities
Beverage Plants
Vegetable Processing
Edible Oil Processing
Seafood Processing
Food Ingredient Production

By removing a portion of floatable and suspended pollutants before biological treatment, the DAF stage can help reduce the pollutant loading on downstream treatment equipment.

Pig Slaughterhouse Wastewater Treatment

Pig slaughterhouse wastewater can contain blood residues, animal fats, grease, hair, tissue particles, suspended solids, proteins, and high concentrations of biodegradable organic matter.

DAF is commonly used for slaughterhouse wastewater pretreatment because flotation can separate suspended solids and fats, oils, and grease before biological processes. Studies and full-scale applications have documented DAF use for slaughterhouse and poultry wastewater treatment.

A typical process can be:

Coarse Screening → Fine Screening → Equalization → Coagulation → Flocculation → DAF → Biological Treatment → Secondary Clarification → Disinfection → Discharge or Reuse

The actual process should be adjusted according to the wastewater composition and discharge requirements.

Farming and Livestock Wastewater

Livestock farms and agricultural facilities can produce wastewater containing suspended organic solids, manure particles, fats, nutrients, and other contaminants.

DAF can be used when a wastewater stream contains sufficient floatable or flocculatable material for flotation separation.

Potential applications include:

Pig Farms
Poultry Farms
Cattle Farms
Livestock Breeding Facilities
Agricultural Processing
Animal Husbandry Facilities
Farm Slaughtering Operations

For high-solids agricultural wastewater, screening and equalization are often important before DAF to protect pumps and maintain stable flotation conditions.

Main Features
Above-Ground Installation

The equipment can be positioned above ground on a prepared foundation, providing convenient access for inspection and maintenance.

Effective Solid-Liquid Separation

Fine air bubbles help separate suspended solids and floatable materials from the liquid phase.

FOG Removal

DAF is particularly useful for wastewater containing fats, oils, and grease. This makes it suitable for food and slaughterhouse applications.

Chemical Conditioning

Coagulation and flocculation systems can be integrated when fine suspended particles require additional conditioning.

Compact Configuration

A compact DAF arrangement can provide efficient primary separation without requiring a large conventional settling basin.

Automatic Operation

PLC control can be incorporated for pumps, skimmers, chemical dosing, air systems, alarms, and sludge discharge.

Main Equipment Components

A typical system may include:

Screening Equipment
Equalization Tank
DAF Flotation Tank
Dissolved Air Saturation System
Recycle Pump
Air Compressor
Pressure Release Components
Coagulation Tank
Flocculation Tank
Chemical Dosing System
Surface Skimmer
Sludge Collection System
Control Cabinet
Piping And Valves

The actual equipment configuration should be selected according to treatment capacity and wastewater characteristics.

Operation and Maintenance

Regular monitoring is important for reliable operation. Operators should check influent flow, suspended solids, oil and grease loading, pH, chemical dosage, recycle flow, air pressure, bubble formation, float thickness, and treated-water quality.

The surface skimmer should remove accumulated float sludge regularly. Pumps, valves, mechanical drives, air systems, and chemical dosing equipment should also receive routine inspection.

For DAF systems treating slaughterhouse or food-processing wastewater, sludge management is particularly important because the flotation process concentrates fats, solids, and organic materials into the float sludge. Research on slaughterhouse DAF systems has also identified the importance of managing concentrated DAF sludge containing both floating and settleable solids.

Why Choose Us?

Our above-ground DAF wastewater treatment solutions are designed for practical installation and integration with complete sewage treatment processes.

Key advantages include:

Above-Ground Equipment Configuration
DAF Air Flotation Technology
Efficient Suspended Solids Separation
Fats, Oils And Grease Removal
Food Factory Wastewater Applications
Pig Slaughterhouse Wastewater Applications
Farming And Livestock Wastewater Applications
Coagulation And Flocculation Integration
Automatic PLC Control Options
Easy Maintenance Access
Flexible Integration With Biological Treatment
Complete Wastewater Treatment Process Support

The system can be configured as a standalone DAF unit or integrated into a complete wastewater treatment plant according to the required treatment capacity and final effluent quality.

FAQs
1. What is an above-ground sewage treatment system?

An above-ground sewage treatment system is installed on a foundation or equipment platform instead of being buried underground, allowing easier access to treatment equipment for operation and maintenance.

2. What does DAF stand for?

DAF stands for Dissolved Air Flotation.

3. What can the DAF air flotation machine remove?

It can separate suspended solids, floatable particles, fats, oils, grease, and suitable flocculated contaminants from wastewater.

4. Is DAF suitable for pig slaughterhouse wastewater?

Yes. DAF is widely used as a pretreatment or primary treatment process for slaughterhouse wastewater containing suspended solids and FOG.

5. Can DAF treat food factory wastewater?

Yes. DAF is suitable for many food-processing wastewater streams containing suspended food particles, fats, oils, grease, and other floatable materials.

6. Can DAF be used for farm wastewater?

Yes. DAF can be incorporated into livestock and agricultural wastewater treatment when the wastewater contains suitable suspended or floatable pollutants.

7. Does the DAF system require chemicals?

Not every application requires chemical dosing. However, coagulants and polymers can improve the formation and flotation of fine suspended particles.

8. Can DAF replace biological treatment?

Generally, no. DAF is primarily a physical-chemical separation process. It is often used before biological treatment to reduce suspended and floatable pollutant loading.

9. Can the system be installed outdoors?

Above-ground DAF systems can be installed outdoors when the equipment, electrical components, piping, and site conditions are appropriately designed for the local environment.

10. Can the DAF machine operate automatically?

Yes. PLC-based automatic control can manage pumps, skimmers, chemical dosing, air systems, alarms, and other process functions.

11. What information is required for DAF system selection?

Important parameters include wastewater flow rate, peak flow, TSS, FOG, COD, BOD, pH, temperature, wastewater composition, required effluent quality, and downstream treatment process.

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