Dissolved Air Flotation Daf Water Treatment For Chemical Petrochemical

DAF Dissolved air flotation for waste water treatment in chemical and petrochemical 800 m3/day Stainless steel

DAF treatment system is to reduce Chemical Oxygen Demand (COD) loading by the removal of high COD contaminants including fats, oils and greases, colour, organic matter and colloidal material. A reduction of up to 90% of COD and suspended solids can be achieved with a dissolved air flotation system. The DAF system can be used with or without the addition of chemicals; depending on the waste type, chemicals can further enhance performance.

Structure explaination

• Integrate flocculation, air flotation, skimmer, sedimentation and mud scraper
• Influent is pumped into center inlet pipe and evenly distributed to the air flotation pond through distributor
• The flow rate in distribution pipe is same as its flow out rate but reversely, therefore a "zero speed"
• The inflow disturbance is minimized and floc is vertically moves under static status.
• The skimmer moves synchronizely with the main machine, while keep rotating to collects the scum and discharged them out through central mud pipe.
• The clean water is collected into clean water pipe, which also moves synchronizely with the main machine, The clean water pipe is separated from water distribution pipe by water distribution gear, therefore, no interference.

Core technology

The high frequency common rail injection strong-solvent cutting patent technology is adopted. The high-speed rotation generates the strong centrifugal force and the micron air integration system makes the dissolved air concentration reach the theoretical maximum value within only three seconds without concentration gradient, which provides guarantee for the manufacturing of large-scale micro bubbles and at the same time, the dynamic factor is reduced substantially and the power consumption cost is subsequently reduced

The microsecond rapid phase separation device is adopted, which makes the phase of water molecule and air molecule in the dissolved air water separate at high speed in reverse direction in less than one microsecond through special structure, instantaneously gather and form the even micro bubbles carrying charge with the diameter of 3-7μm and therefore make the bubble concentration increase geometrically under the same dissolved air quantity. The integrated charged bubble has changed the surface tension of the water, absorbed with the colored group and part of hydrophilic colloid, which is a revolutionary breakthrough of purification efficiency and meanwhile, the input amount of PAC and PAM is substantially reduced or becomes unnecessary.

Features

• The purification pond is shallow, however, its surface has sufficient scum reserve space, which is specially suitable for the treatment of high and dense sewage.
• It ensure small, or even zero floor space, which could be overhead, assembled or set on the building.
• It’s set with automatic water level adjustment device, providing wide flow application scope and high scum solid rate
• It has great rigidity and could be supported by only one “groined” concrete beam. It’s not necessary to build the platform and the civil engineering expense is quite low
• The rotary joint adopts the high-tech patened technology, which requires no maintenance. The abrasion could be adjusted as well. The long-term operation will not generate the water leakage and belongs to permanent design
• The key parts and components, such as the bearing, after service life calculation and examined by the industry practice, give extremely low failure tate and low maintenance expenses. The drive and scraping motors are left with sufficient margins to ensure the long-term continuous operation will not be overheated
• The moving elements are set with multiple protection, which could be reliably operated in the open air for long time
• It’s set with the lubrication device, which could ensure small maintenance workload and convenient management

Specifications

Industry application

Comptetive advantage

It’s the designated enterprise of the Ministry of Chemical Industry, and cooperated with US Dransfield Company to specialize in the production of DAF equipments. It has cooperated with the Chinese and foreign groups, represented by Doctor James Madison, Doctor Peter Keatinge and Joseph Pankratz, former main designers of Krofta to develop the highly effective superficial DAF (Krofta) regeneration products superficial ion DAF with super high surface load.