NanoDAF™ Dissolved Air Flotation (DAF)
NanoDAF is the process of removing suspended solids, oils and other contaminants via the use of air bubble flotation. Air is dissolved into water, mixed with the waste stream and released from solution while in intimate contact with the contaminants. Air bubbles form, attach to the solids, increase their buoyancy and float the solids to the water’s surface where they are mechanically skimmed and removed from the tank. A percentage of the clean effluent is recycled and super-saturated with air, mixed with the wastewater influent and injected into the DAF separation chamber. Air is injected under pressure into a recycle stream of clarified DAF effluent. This recycle stream is then combined and mixed with incoming wastewater in an internal contact chamber where dissolved air comes out of solution in the form of very fine bubbles that attach to the contaminants. The bubbles and the contaminants rise to the surface and form a floating bed of material that is removed by a surface skimmer into an internal hopper for further handling. This handling may include a belt filter press or a rotary vacuum drum with DE applied.
WHAT CONTAMINANTS DOES DAF REMOVED
NanoDAF™ systems are designed to remove fats, oils and grease (FOG), suspended solids (TSS), biological oxygen demand (BOD), food/animal production/processing wastes, industrial wastes, hydrocarbon oils/emulsions and many other contaminants. Clarification rates as high as 97% or more can be achieved using these systems.
- COD: 35-80%
- Suspended solids: 85-95%
- Phosphates: 90%
- Sulfides: 99%
- Metals: 95%
DAF ANATOMY
The DAF system consists of
- Coagulation –Flocculation system
- Floatation tank
- Recirculation System which consist of
– Air Dissolving Vessel (Saturating tank )
– Air Compressor
– Recycle pumps
– Air control Panel
– piping and Air outlet perforated units - Skimmer
- chemical treatment facility
- Sludge withdrawal mechanism
NanoDAF™ Air Saturator & Diffuser
NanoDAF™ Dissolved air flotation systems are designed to remove fats, oils and grease (FOG), suspended solids (TSS), biological oxygen demand (BOD), food/animal production/processing wastes, industrial wastes, hydrocarbon oils/emulsions and many other contaminants.
In DAF systems, an air-saturator is used to dissolve air in water by applying high pressure (300–700 kPa). Thereafter, the mixture of air and water are released into a flotation tank which is exposed to atmospheric pressure.
Due to the depressurization, the dissolved air starts to precipitate and form micro-bubbles
The air saturator is used to dissolve air in the water and then generate bubbles to float the floc particles. Some of the main advantages of DAF include better performance for removing light particles such as algae, which are difficult to settle.
NANOWATER TECHNOLOGY INTEGRATION
Integrated treatment methods have been widely practised NanoWater team of Engineers by coupling two or more biological, physical, and chemical processes to treat treatment/elimination of unwanted color, target compounds and toxicity from wastewater or contaminated environment.
Innovative and Integrated Technologies for the Treatment of Industrial Wastewater deals with advanced technological solutions for the treatment of industrial wastewater such as aerobic granular biomass based systems, advanced oxidation processes integrated with biological treatments, membrane contactors and membrane chemical reactors. Wastewater from pharmaceutical, chemical and food industries as well as landfill leachates are specifically considered as representative of major problems encountered when treating industrial streams. The economic and environmental sustainability of the above solutions are also reported in the book and compared with the alternatives currently available in the market by life cycle assessment (LCA) and life cycle costing (LCC) methodologies. The implementation of the considered solutions at large scale could support and enhance the competitiveness of different industrial sectors, including the water technology sector, in the global market.
NanoWater engineers integrate our NanoDAF™ , NanoSettler™ and T-Floc™ technologies to produce a high performance state of the art one process technology which is the best in the particle settling technology in the market place.
HP-Settler ™ compose of three different technologies to guarantee 100% settling efficiency.
NanoWater FACTORY
NanoWater products are based on proven designs, offering customers robust, reliable and efficient equipment, all fabricated in our own factory.
With a dedicated factory specialize in high-quality stainless steel ,Mild Steel and Carbon Steel fabrication ensuring corrosion free, long life and reliability.
- CUTTING
- SS-steel up to 10 mm
- Mild steel/Carbon steel up to 12 mm
- PLASMA CUTTING
- SS-steel up to 15 mm
- Mild steel/Carbon steel up to 20 mm
- CNC TURNING LATHE
- 3 axle for maximum setting distance 1500 mm max. clamping diameter 260 mm
- DRILLING MACHINES
- Slots between 5 – 80 mm
- WELDING
- TIG certified process
- MIG/MAG certified process
- Pending Machine
- S.Steel up to 8 mm
- Mild Steel /Carbon Steel up to 12 mm
- PICKLING/PASSIVATION
- Brush, spraying and dipping
- PAINTING
- Spraying for Mild/Carbon steel parts
HP-Settler™ ENGINEERING DESIGN
HP-Settler™ ACTUAL EQUIPMENT
TYPICAL APPLICATIONS
NanoDAF™ is a proven, and effective physical-chemical technology commonly used for many industrial and municipal applications, including:
- Product recovery and reuse
- Pretreatment to meet sewer discharge limits
- Pretreatment to reduce loading on downstream biological systems
- Polishing of biological treatment effluent
- Removing silt and grease from industrial water
DAF is used extensively in the following industries:
- Meat, poultry and fish processing
- Dairy industry
- Petrochemicals
- Pulp and paper
- Food and beverage
SYSTEM SELECTION CHART
Model | Capacity | Dimension (mm) | Net Weight | Running Weight | Total Power | Reflux Pump | Air Compressor | Surface Skimmer | Mixer 1 | Mixer2 | Material | ||
(m3/h) | L | W | H | Tons | Tons | KW | KW | KW | KW | KW | KW | CS | |
NANO.DAF-005 | 5 | 2800 | 1000 | 2100 | 3 | 8 | 4.75 | 3 | 0.55 | 0.1 | 0.55 | 0.55 | CS |
NANO.DAF-010 | 10 | 3200 | 1200 | 2200 | 4 | 12 | 4.75 | 3 | 0.55 | 0.1 | 0.55 | 0.55 | CS |
NANO.DAF-025 | 25 | 5000 | 1500 | 1350 | 5.5 | 21 | 5.85 | 3.7 | 0.75 | 0.1 | 0.75 | 0.55 | CS |
NANO.DAF-050 | 50 | 6500 | 2000 | 2500 | 7 | 36 | 9.05 | 5.5 | 1.5 | 0.2 | 1.1 | 0.75 | CS |
NANO.DAF-080 | 80 | 7600 | 2600 | 2600 | 9 | 55 | 11.05 | 7.5 | 1.5 | 0.2 | 1.1 | 0.75 | CS |
NANO.DAF-100 | 100 | 8300 | 3000 | 2600 | 12 | 70 | 16.2 | 7.5 | 2.2 | 0.4 | 1.5 | 1.1 | CS |
NanoDAF™ is an alternative clarification process ideal for treating raw water with light particles, such as algae or color-causing organics, and at low temperatures when sedimentation is not as effective .DAF has become a mainstream clarification process for drinking water treatment plants, especially where algae is prevalent, as well as a popular pretreatment process for seawater desalination systems to combat red tide or algae bloom occurrences throughout the world.
