DAF
Dissolved Air Floatation Systems (DAFs) are systems in which suspended particles are floated on the surface by compressed air blower. For this purpose, an under pressure reactor is used for partial saturating of the filtered water by the air outlet. The entire flow of air remains in the reactor for a few minutes to provide an opportunity to dissolve the air in the water. The pressured flow then passes through a pressure breaker valve and the bubbles enter the ADF tank at a pressure above atmospheric pressure. Air bubbles stick to solids and also insoluble liquid, and its density drops to a particle rise.
The main advantage of Dissolved Air Floatation Systems (DAFs) in comparison with sedimentation is that small or light particles that are gently deposited can be eliminated more fully and in a shorter time. DAF systems reduce the TSS, BOD, COD, fat, oil and algae more effectively.
Application :
DAF systems can be applied as a pretreatment to meet a municipality’s specific limits for oil, grease, or suspended solids, or to remove contaminants that would negatively impact an industrial biological wastewater treatment system downstream.
They also can be used to thicken already separated sludge (chemical, physical or biological), and generally allow for an increase in the concentration of sludge from 1% to 8-10%.
DAF technology is ideally suited to neutral-density particles and those that are buoyant or settle slowly. This is particularly relevant to the food industry and other businesses that produce light, high-volume solids that are resistant to settling. DAF also takes up about 25% of the equivalent surface area compared to conventional clarification technologies.
DAF is a proven, robust, 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
Target:
- Removal of biological phosphorus from sludge
- Reduce polymer usuage at the sludge dewateringstage
Advantages:
- Competitive price
- Easy operation and function
- Excellent performance in difficult and fragile conditions
- There are 3 different tank elevation depending on the type of application
- Greater flexibility for varying flow rates
- Enhanced efficiency
Benefits :
- Plug&Play Solution
- Maximum reliability and durability
- Constant effluent quality
- High contaminant removal efficiency
- Simple treatment system
- Fast start-up
- Possibility of transport and/or installation in containers or on platforms
- Low maintenance
- No prior civil works required