DAF Unit Design
A flotation unit is a tank with two working chambers, with an impeller located in the lower section.
The wastewater enters the working chamber through an injector. During impeller rotation and air injection, solid contaminants (debris, paint particles, polymer inclusions) are separated from the liquid, as well as cellulose fibers in paper slurry. The impeller is driven by an electric motor. In the upper part of the flotation unit, a scraper or similar mechanism removes the floated sludge into a sludge collection chamber.
The resulting flotation sludge, with a reduced content of foreign inclusions, is discharged by gravity or pumped into the next treatment stage.
The wastewater enters the working chamber through an injector. During impeller rotation and air injection, solid contaminants (debris, paint particles, polymer inclusions) are separated from the liquid, as well as cellulose fibers in paper slurry. The impeller is driven by an electric motor. In the upper part of the flotation unit, a scraper or similar mechanism removes the floated sludge into a sludge collection chamber.
The resulting flotation sludge, with a reduced content of foreign inclusions, is discharged by gravity or pumped into the next treatment stage.
Steel Frame Construction
Internal Chambers Made of Gray Sheet Polypropylene
Corrosion Resistance
Easy Maintenance
Operating Principle of the Dissolved Air Flotation (DAF) Unit
The wastewater treatment process using a DAF unit consists of several stages:
Wastewater Pre-Treatment
Industrial wastewater undergoes preliminary coarse mechanical treatment, during which debris and large solid particles are removed.
Wastewater Feeding into the DAF Unit
Pre-treated wastewater enters the flotation unit, where it is mixed in a special chamber with water saturated with dissolved air supplied from the saturator.
Bubble Formation
When pressure drops inside the chamber, microscopic air bubbles form throughout the liquid volume. These bubbles attach to contamination particles and lift them to the surface, where a sludge layer forms.
Air-Water Mixture Flow Control
The recirculated air-water mixture flow typically equals 50% of the flotation unit capacity. If the contamination concentration increases, the recirculation flow supplied to the DAF unit automatically increases as well, ensuring the required treatment efficiency.
Sludge Removal
The sludge layer is continuously removed from the surface by a scraper mechanism:
- the sludge enters the sludge collection tray;
- then flows through a pipeline into a separate sludge tank.
Clean Water Discharge
After passing through the entire flotation chamber and being separated from floating contaminants, the treated water flows beneath the submerged partition wall into the clean water compartment and is discharged through the outlet pipeline.
Thus, the system operates in a continuous closed-cycle mode, ensuring efficient and uninterrupted wastewater treatment.
Thus, the system operates in a continuous closed-cycle mode, ensuring efficient and uninterrupted wastewater treatment.
Guaranteed Treatment Efficiency
PRIMELOS equipment ensures wastewater treatment in compliance with discharge standards for fishery water bodies.
Fats and Oils
Efficiency: removal up to 98%
Effective removal of greasy contaminants.
Effective removal of greasy contaminants.
Petroleum Products
Efficiency: removal up to 98%
Treatment of wastewater containing free and emulsified oils, gasoline, and diesel fuel.
Treatment of wastewater containing free and emulsified oils, gasoline, and diesel fuel.
Suspended Solids
Efficiency: removal up to 98%
Improves water clarity and removes fine suspended particles that do not settle in conventional sedimentation tanks.
Improves water clarity and removes fine suspended particles that do not settle in conventional sedimentation tanks.
COD (Chemical Oxygen Demand)
After treatment: reduction by 70–80%
Deep oxidation of organic compounds and preparation of wastewater for biological treatment or discharge.
Deep oxidation of organic compounds and preparation of wastewater for biological treatment or discharge.
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Applications of Dissolved Air Flotation (DAF) Unit
Flotation units are a key component in wastewater treatment systems where effluents contain high concentrations of fats, petroleum products, and complex organic contaminants. We design systems that help facilities comply with environmental regulations.
Food Industry
Efficient separation of fats and organic matter at meat-processing plants, dairy factories, and confectionery facilities. Prevents clogging of central drainage systems.
Petrochemical Industry
Treatment of wastewater contaminated with petroleum products. Reliable operation in aggressive environments and under high pollution loads.
Car Washes and Transport Facilities
Removal of fuels, oils, and suspended solids for water reuse or safe discharge. Compact flotation units suitable for limited installation spaces.
Pulp and Paper Mills
Removal of fibers and fine particles from process water. Reduces the load on downstream filtration and biological treatment stages.
Frequently Asked Questions
To achieve maximum treatment efficiency (especially when emulsified fats are present), we recommend using coagulants and flocculants. PRIMELOS flotation units are already equipped with an automatic dosing system that precisely measures the required amount of reagents, minimizing their consumption.
PRIMELOS flotation units are equipped with a reliable scraper mechanism. It automatically removes the sludge foam layer from the water surface into a dedicated collection tray, from where it is discharged for disposal or dewatering.
Our systems are designed to operate with industrial wastewater of varying temperatures. However, for stable flotation performance, we recommend installing an equalization tank before the flotation unit to balance the temperature and composition of the incoming wastewater.
We use wear-resistant materials and reliable drives designed for continuous operation in aggressive environments. The service life of the mechanical components exceeds 10 years, provided that scheduled maintenance requirements are followed.
100+ Successfully Delivered Industrial Water Treatment Projects
Advanced Manufacturing. Engineered Water Solutions.
100+
Projects Delivered
1500 м²
Production Facility
100%
Regulatory Compliance
We go beyond manufacturing.
Our team designs and delivers integrated water and wastewater treatment systems tailored to each project’s requirements. Every solution is engineered, tested, and optimized to ensure long-term reliability and performance in real-world operating conditions.
Our team designs and delivers integrated water and wastewater treatment systems tailored to each project’s requirements. Every solution is engineered, tested, and optimized to ensure long-term reliability and performance in real-world operating conditions.
PRIMELOS is your trusted partner for complex industrial projects. We provide on-time delivery, nationwide logistics, and full engineering support—from concept and design to installation and commissioning. Our experts develop customized solutions tailored to your specific operational needs.
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Buy an Industrial Flotation Unit with Delivery
PRIMELOS plant offers modern solutions for industrial wastewater treatment systems. Our pressure reagent flotation units effectively remove emulsified fats, petroleum products, and suspended solids, reducing the load on municipal sewer networks and helping предприятия avoid penalties from environmental authorities.
Our systems provide the optimal combination of cost efficiency, durability, and ease of installation for wastewater treatment systems of any complexity.
Our systems provide the optimal combination of cost efficiency, durability, and ease of installation for wastewater treatment systems of any complexity.