The Dissolved Air Flotation (DAF) water treatment process is a physical and chemical technology for the effective removal of biological solids from a wide range of industrial wastewaters to maintain environmental compliance and reduce trade effluent charges.
DAF systems are designed to reduce total suspended solids (TSS), biochemical oxygen demand (BOD), and fats, oils and greases (FOG) from a wastewater stream.
The highly refined DAF system mixes air and pressurised water, which forms micro-bubbles that adheres to flocs of suspended material coagulated by chemicals and creates a floating bed of sludge to be removed, leaving clean final discharge water.
Reduced sludge volume and tankering costs with higher dry solids
Fully automated control system, reduces the need for manual operation
Flexible process that be can adjusted in-situ
Easy to install compact design with a small footprint
Energy efficient treatment of wastewater
Chemical regime optimised for use with our technologies
White water system utilises a saturation vessel to negate the need for diffusers within the floatation tank
Can be used for recovery and recycling of non-emulsified oils with no further treatment required
Higher quality effluent discharged to sewer further reducing trade effluent charges
Sludge often suitable for Anerobic Digestion disposal route
Stainless (304 or 316) plus reinforced plastic components reduce wear and corrosion
Purpose build, adaptable flocculation system to allow ideal sampling, pH correction and dosing
Can be linked with Screening and Sludge Dewatering for even higher efficiency
Can be integrated with site SCADAR and BMS (building management systems)
Multiple systems can be installed in parallel for higher or variable flows
Multiple chemical injection and sampling points to site requirement
Containerised or skid mounted for temporary solutions – trial and hire options
WCS Environmental Engineering offers full commissioning and training to customers with annual service contracts
Skid mounted DAF
The system is a physical process enhanced with chemical dosing which operates on a simple design philosophy. Incoming effluent can be screened to increase solids and COD reduction.
Adjustment of pH may also be necessary to ensure optimum operating conditions.
The effluent flows through the flocculator to be pH corrected and dosed with a coagulant and flocculant, entering the DAF cell and mixes with white-water (a combination of air and water mixed under pressure to form micro-bubbles.
As the white-water and effluent mix, the micro-bubbles attach to the colloidal matter and chemical flocculants within the effluent, and move together forming larger flocs that float to the DAF surface.
The surface skimmer uses paddles to push the floating flocs (sludge) into the sludge hopper to be removed and sent to a separate sludge tank. The paddles have adjustable speeds or dwell times to reduce water entering the sludge hopper.
As the flocs float, the solids free water is pushed down to the middle of the DAF cell, ready to be saturated back into white-water. This gives the DAF a constant supply of clean white-water without the expense of adding fresh potable water to the system.
Where solids normally sink (sand, grit etc), they collect in the hopper and are removed via a manual or automated valve, dependent on the effluent.
The final treated “clean” effluent discharges to either drain or for further treatment.
Food and Beverage such as
consumer food and beverage products
raw agricultural goods
Waste management and remediation services
Personal care and cosmetics
Aggregates and raw materials
Metal finishes, mining and quarrying
Fish farms and livestock manure
Machinery manufacturing and metal processing plants
Paper mill and glass factories