QDEVU® Domestic Sewage Treatment Dissolved Air Flotation Machine

QDEVU Air Flotation System can effectively remove the light flocs, flocculated colloidal substances, oil substances, etc. that are difficult to precipitate in wastewater,achieve the purpose of solid-liquid separation.

QDEVU Dissolved Air Flotation (DAF) System is a process to remove grease, oil and other fine suspended matter, reduce COD BOD,TSS to achieve maximum treatment efficiency in a compact footprint. It is able to remove a variety of contaminants to meet trade waste or reuse requirements. Each system is sized based on the hydraulic loading rate, Total Suspended Solids (TSS) and Fats, Oil and Greases (FOG) levels.

The DAF separates the suspended solids and lighter liquid contaminants (eg FOG and hydrocarbons) from the water by moving them to the surface of the DAF vessel and then scraping them off the surface. A pressurised stream of airsaturated water is mixed with the flocculated water and with the release of pressure, a cloud of very fine air bubbles carries the suspended solids and lighter liquids to the tank surface. Clean water overflows from the DAF tank, via an under/over-weir to sewer or to the next stage of the treatment process. The overflow level is adjustable and controls the level in the DAF flotation section. The sludge on the surface of the DAF is scraped into a sludge hopper by a mechanical scraper. The DAF system is automated via a programmable logic controller (PLC) mounted within a control cabinet on the system.

FEATURE

• Design treatment capacity:5-300 m3/h.
• High-rate clarifier for high SS water (light particles, oil and colloid).
• Indoor or outdoor layout (environmental temperature should be over 0°C).
• Apply to automatic & continuous operation.

ADVANTAGE

• Extremely high scraping speed (2-3 times faster than conventional design) and safety operation because of using fully reverse and closed scraper.
• High hydraulic load and low footprint because of horizontal plates in the separation zone, more effective separation and optimization hydraulic flow in the separation area.
• Better outlet water quality because of W-shape sludge sedimentation hopper.
• Effectively minimize chemical consumption because of re-flocculation performance of reverse scraping design.
• No blind angle in scum collection chamber.

APPLICATION

• Separating small particles and algae in groundwater.
• Recovering valuable matters in industrial sewage such as paper pulp.
• Acting as secondary sedimentation tank to separate and concentrate suspended particles and sludge.