Dissloved air flottion machine

DAF is the use or partially treated water back to the water, the micro-bubble generator draws air into the mix to form a dissolved gas and water, release pressure in the flotation tanks, into the air bubbles in the water to form 20-30μm precipitation, has a high surface area and adsorption capacity for different concentrations of suspended solids in wastewater can be better removed, some water after treatment (design target of 20-40% can usually be 30%), the flotation cycle work pump, pressure tank carried into the aqueous mixed with air, the air is dissolved into the water, then dissolved gas efficiency of more than 80%. Air dissolved in water is released from the water, forming a particle size of 20-50μm microbubbles, microbubbles suspended solids in sewage-binding, so the proportion of suspended solids in the sewage becomes small, floating on the water until the surface; forming a large number of floating slag, then by flotation pool installation chain foam blowing machine, remove the scum, to the treatment effect.
 

█ Features

1. Solution pump suction side suction side, the pump pressure mixing, high efficiency gas-liquid dissolved, fine bubbles ≤30um.

2. Complex systems can replace solvent pump circulating pump, air compressor, dissolved gas cylinders, ejector and release top thereof.

3. Low voltage operation, dissolved air efficiency up to 99%, the release rate of 99%.

4. Efficient absorption of micro-bubbles and suspended particles, increases the SS removal.

5. Dissolved gas dissolved in water efficiency 80-100% higher than the efficiency of conventional DAF 3 times.

6. Pressure - volume curve is flat, easy to implement automatic control, easy operation and easy maintenance, low noise.

█ Scope

Papermaking wastewater treatment and fiber recovery; dyeing wastewater treatment; such as electroplating wastewater containing heavy metal ions; oily wastewater treatment; tannery wastewater treatment; Wastewater Treatment; paint wastewater treatment; food wastewater treatment; acid phosphate wastewater treatment;

Sludge biological treatment, water separation; low temperature and low turbidity of ground water;

Municipal sewage, chemical industry, beverage industry, oil refining industry, food industry, textile industry, slaughter industry, the dairy industry, involving the separation of suspended solids, oily water separation and purification, coagulation reaction floc separation, separation of activated sludge and other aspects of Applications.

1 Works

1 raw water through the pump into the flotation device center 2 pipe 3, by rotating hydraulic rotary joint 4 and 5 of the dispensing tube evenly into the bottom of the flotation tank with dissolved air into the water through the central tube 7 rotatable dispensing tube 8 , and the raw water into the bottom of the flotation tank sync. 9 is also a hydraulic rotary joint. Full of microbubbles of dissolved gas and water with raw water in the bottom of the flotation device adequate collision, adhesion, so that the proportion of fine particles in the raw water is formed <1 rises to the surface scum is removed. Raw water distribution pipe 5 and dissolved gas and water distribution pipe 8 is fixed on the same rotating device 10, the rotational direction and p = "">

Scum layer formed on the surface 11 is collected by the spiral skimming device, and then after it is discharged slag discharge pipe 12 outside the pool. The clarified water collector pipe 13 by the rotation of the collection back to the outside pool, the collector pipe 13 and central rotary portion 14 together, so that the residence time of the raw water in the flotation tank is part of the central rotary rotation cycle.

Even walking on a rotating blade device will sink and the wall on the bottom mud scraped the mud bucket 6, periodic emissions.

Another important improvement is fixed at a certain distance from each other on the rotating frame 10 to walk a set of concentric cone plate means 15, together with the water distribution section along flotation tank synchronous rotation. Each two adjacent panels to form a tapered inclined ring flotation zone 16, the water within the time zone in a laminar flow state, accelerated particle impurities microbubbles with rising speed.

Air Flotation device further comprises a pair of parallel operation of the melting pipe 20 (referred to as ADT'S), into the low pressure pump 17, just 202.6 kPa. Water by first three-way valve connected to two ADT'S 18, the other end of the arrangement ADT'S dissolved gas outlet. Compressed air also passes through a three-way valve 19 and the pressure of the water at the same end into the ADT'S, compressed air pressure is generally 707.8 kPa. All of the three-way valve by an actuator linkage, during normal operation, an ADT of inlet and outlet are opened to release dissolved gas and water, and the intake port is closed; while the other ADT inlet and outlet is closed, the compressed air by 20 ~ 40 μm microporous stainless steel plate into the ADT, by the pressure of compressed air to the air dissolved in water, rather than water pressure. Water along the tangential direction of high-speed access ADT, the flow rate of up to 10 m / s, pressure water spiral in ADT in advance, up to 995 r / min, inlet can be adjusted to control the flow and velocity.

Compare 2 shallow air flotation and conventional flotation device

① conventional flotation device in pool depth is generally 2.0 ~ 2.5 m, it is because the device is stationary, the water is in motion. Water enters the contact area will produce from the reaction chamber changes and redistribution of the flow velocity of the water that is converted into a uniform upward flow, which requires a certain amount of time and altitude to complete the change, its height is generally not low to 1.5 m. The Air Flotation Since the "zero speed" application of the principle to achieve a device is in motion, the water is still, eliminating the disturbance of water particles and the effect of water separation suspension of, reducing the height requirements; Also in conventional flotation devices, it is inevitable that sediment or floc particle sinking to the bottom, to prevent silt out of the bottom of the outlet pipe is generally REM 300 mm, while in shallow flotation device, since the bottom scraper provided device, so no hanging high stage set. By this analysis, the effective depth shallow flotation device is generally 400 ~ 500 mm.

② conventional flotation device, the residence time of the water is generally controlled at 10 ~ 20 min; and shallow flotation device, the residence time of only 2 ~ 3 min.

③ conventional flotation device, a dissolved air system is equipped with a dissolved gas cylinders, if the actual volume of dissolved gas cylinders to calculate its HRT 2 ~ 4 min; and shallow flotation device, dissolved air system uses The trachea is dissolved, canceled the packing, make dissolve the trachea volume utilization rate of 100%, the hydraulic retention time of only 10 ~ 15 s.

④ In conventional flotation device, periodically scraping residue of scum layer is clear, it can not be based on selective cleaning scum floating time, so not only have a greater disturbance of water, and the water content of scum It is larger; in shallow flotation device, the helical skimmers installed in front of the water distribution system, always remove the scum floating flotation tanks longest (2 ~ 3 min) scum, namely solid liquid separation of the most thorough, minimum water content scum.

Through the above analysis and comparison, shallow flotation device and a conventional flotation devices are essentially different, its superior technical performance has been increasing attention to domestic users and environmental circles. If we can speed up the introduction of this technology and make it domestically, it will bring enormous economic and social benefits.