General Description

• Wastewater Source: Industrial food processing and equipment wash water (high fats, oils, and grease).
• Daily Flow Volume: Max 750 m³/day.
• Hourly Design Flow Rate: 35 m³/hour to 40.0 m³/hour (depending on contamination)

• pH Range: 6.0 – 9.5
• COD (Chemical Oxygen Demand): 2,780 – 4,370 mg/l
• BOD5 (Biochemical Oxygen Demand): 1821 – 2,951 mg/l
• SS (Suspended Solids): 800 – 1116 mg/l
• FOG (Fats, Oils, & Grease): 153 – 506 mg/l
• Wastewater Temperature: < 35°C

• pH: 6.0 – 10.0
• COD: < 3,200 mg/l (Average 24h sample)
• BOD5: < 1,600 mg/l
• SS: < 100 mg/l
• FOG: < 20 mg/l

The illustrated DAF expectations correspond to approximately:

**TSS removal:** 80–90%

 **FOG removal:** 80–90%

 **COD removal:** 20–50%

 **BOD₅ removal:** 10–35%

Results depend on pollutant form, chemical selection, operating conditions, and wastewater variability. Strongly emulsified oil and predominantly soluble COD may require additional treatment.

 

How the DAF System Works 

Step 1: Screening and Equalization 

Screens remove food debris and other coarse materials. The equalization tank balances flow and water quality before chemical treatment.

 Step 2: pH Adjustment and Coagulation

 Acid or alkali is added when necessary to establish appropriate treatment conditions. A selected coagulant destabilizes colloidal particles and helps capture dispersed contaminants.

The optimal pH and chemical type must be determined through testing.

Step 3: Flocculation

 Gentle mixing and polymer addition help smaller particles form larger flocs that can attach to air bubbles.

 Excessive mixing can break flocs and reduce flotation performance.

Step 4: Dissolved Air Flotation

 A portion of clarified water is pressurized and contacted with air. When released into the flotation zone, the pressure reduction produces fine bubbles.

These bubbles attach to flocs and lift them toward the surface.

  Step 5: Sludge Removal and Effluent Collection

 A surface scraper transfers floated sludge to a collection hopper. Clarified water exits through the outlet arrangement and proceeds to the next treatment stage.

Bottom solids should also be removed where the wastewater produces settling material.

Dissolved Air Flotation Machine Specification

Hinada the leading manufacturer of DAF System for industrial wastewater treatment according to project requirement. To make the suitable proposal, we need know more details of project included: capacity, wastewater source,wastewater quality (SS,BOD,COD,FOG etc ).

Dissolved Air Flotation System main feature

DAF System for Food Processing Application

– Dairy and cheese processing

– Meat and poultry processing

– Seafood processing

– Edible oil and prepared-food production

– Industrial bakery rinsing and equipment wash water (high fats, oils, and grease)and confectionery manufacturing

– Vegetable and fruit processing

– Food production facilities with significant washdown wastewater

DAF System Benifits

Dissolved Air Flotation System with the purpose to reduce and remove or low down the COD, TSS and FOG from industrial wastewater.  The DAF system utilises fine air bubbles, also known as ‘White Water’, which attach themselves to the suspended material within the waste stream, increasing buoyancy and floating them to the surface. The floated solids are then removed by a simple but effective scraper mechanism. More often than not chemical conditioning is used to increase the effectiveness of the Dissolved Air Flotation process.

* Hinada has 10 Years custom DAF System for wastewater  treatment designing experiences, we can design and install as your any project requirements, reduce your projects investing cost.
* Standard designs according your application, requirement and budget, we are one of leading DAF system manufacturers in China, we can produce and accept any special requirement orders.

Packaging

Plywood case packed or in container loading.

FRQ

Frequently Asked Questions

 

1. Can the 750 m³/day DAF system meet final discharge limits by itself?

Definitely can not , DAF System is pretreatment and effective for suspended solids, fats, and associated organic matter, but soluble COD, BOD, TDS and nutrients may remain. Most high-strength food wastewaters require additional treatment.

 

      2.   Why is a 40 m³/hour unit proposed for 750 m³/day?

 The average flow over 24 hours is 31.25 m³/hour. A preliminary 40 m³/hour selection provides some hydraulic flexibility, but actual capacity must also be checked against operating hours, peak flow, solids loading, and flotation tests.

 

    3.   Does DAF require chemicals?

 Many food wastewater applications benefit from coagulation and flocculation, or maybe need PH Adjust. Some free fats and floatable solids may separate without chemicals, but dependable performance should be established through testing.

 

   3.   Is the equipment fully automatic?

 PLC controls can automate control feed pumps according to water level detector, dosing, recycle pressure, and scraper cycles. Operators are still needed for inspection, chemical replenishment, process adjustments, and maintenance.

 

   4.  Can DAF-treated water be reused in food production?

DAF effluent alone should not be assumed suitable for food contact or potable use. Reuse requires application-specific treatment, monitoring, and compliance with relevant food-safety and water-quality requirements.

 

   5.  Request a 750 m³/day Food Wastewater Treatment Proposal

 Send HINADA your wastewater analysis, production schedule, daily and peak flow, discharge requirements, site layout, and available utilities.

Discuss a DAF package designed around your wastewater—not just a nominal flow rate.**

HINADA — Water is life, treat it right.