What are the characteristics of shallow air flotation machine? What are the types of air flotation m

Air flotation machine is a water treatment equipment that produces a large number of fine bubbles in the water by the dissolved air system, so that the air is attached to the suspended matter particles in the form of highly dispersed tiny bubbles, resulting in a state with a density less than that of water, and uses the principle of buoyancy to make it float on the water surface, so as to realize the solid-liquid separation. Air flotation machines are divided into super-efficient shallow air flotation machines, vortex concave air flotation machines, and advection air flotation machines. At present, it has applications in water supply, industrial wastewater and urban sewage treatment.

The advantages of air flotation machine are that its solid-liquid separation equipment has the characteristics of low investment, very small ground occupation, high degree of automation, and convenient operation and management. Weifang Tianyuan Environmental Protection Technology Co., Ltd. is a high-tech enterprise integrating the production and research and development of environmental protection equipment, and is now the cooperation base of Shandong Academy of Water Conservancy Sciences, and was designated as a key recommended enterprise by Shandong Provincial Environmental Protection Bureau in 2011. Advanced....

Features of super-efficient shallow air flotation machine system.

1. Qianshunxiang shallow air flotation machine adopts "shallow theory", "zero speed theory" and new dissolved gas mechanism design;

2. The residence time is short, only 3-5 minutes, the surface load is high, and the floor area is small;

3. The pool depth is only 600-700mm;

4. The solid content of the slag can be as high as 3-5%, the removal rate of suspended solids can be up to 98%, and the suspended solids in the effluent can be less than 30mg l;

5. Forced water distribution, inlet and outlet water are static, and the adhesion of microbubbles and flocs occurs in the whole air flotation separation process including the contact area; The scum is instantaneously removed, isolated and discharged, and the water disturbance is very small;

6. The design of the dissolved air tube is unique, the volume is small, the dissolved gas efficiency is high, and the dissolved air water and the addition point of the agent are reasonably selected to ensure the realization of copolymerization air flotation;

7. The equipment is lightweight, high efficiency, high stability, easy to transport and install;

8. This product is our company to attract foreign advanced technology, innovation and development, and has the leading level in China.

At present, there are many types of air flotation machines in the industry, including electrolytic air flotation, dispersion air flotation, dissolved air flotation, combined air flotation, high-efficiency shallow air flotation, etc., as follows

1. Advection pressurized dissolved air flotation machine: the dissolved air mode is pressurized jet (not easy to block inside), this kind of air flotation is currently widely used in China, the structure is relatively simple, the on-site operation and installation are relatively simple, and it is suitable for the pretreatment and partial follow-up treatment of various industrial wastewater and municipal wastewater.

2. Vertical flow pressurized dissolved air flotation machine: the dissolved air mode is pressurized jet, this kind of air flotation is currently used very little in China, due to the complex structure, high height, difficult operation and maintenance, etc., so the effect of relative advection pressurized dissolved air flotation is greatly discounted, and there is only an advantage in the occupied space.

3. Multiphase mist air flotation machine (also called dissolved air pump air flotation): the dissolved air mode is negative pressure suction before the pump, this kind of air flotation is currently used more in China, because it does not need air compressors and pressure vessels (except for large gas storage tanks) and other characteristics, the canopy can basically replace the traditional pressurized dissolved air flotation in the form of water pumps, air compressors, dissolved air tanks, etc., and generally choose imported dissolved air pumps, such as edur, Niconi dress, etc., the effect and service life of domestic dissolved air pumps can not be compared with imported ones.

4. High-efficiency shallow air flotation machine: the dissolved air mode is pressurized jet, this kind of air flotation is also widely used in China, especially in the paper industry, other industries have begun to use slowly in recent years, due to the complex structure, relatively high technical content, the current domestic good is not very good (suitable for projects with large water volume, the water volume is less than 100t h It is recommended to use GF type dissolved air flotation).

5. Vortex concave air flotation machine: the dissolved air mode is the high-speed rotation of the impeller to produce micro-bubbles by negative pressure suction, which is widely used in China, mainly in the pretreatment section of oily wastewater, and the effect is better.

6. Sequential air flotation machine: the dissolved gas mode is vortex concave aeration + multi-phase mixture dissolution (dissolved air pump), in fact, this kind of air flotation has been used in China for a long time, that is, the combination of vortex concave air flotation + dissolved air flotation is used more in oily wastewater treatment, but this combination has begun to be promoted in recent years, and it is not a new technology.

7. Catalytic oxidation air flotation machine: the dissolved gas mode is catalytic oxidation tank + pressurized jet dissolved gas, which is rarely used in China, and is mainly used for special wastewater with high concentration, COD and other relatively high and difficult to treat.

8. Multi-stage air flotation machine: the dissolved air mode is pressurized jet, and this kind of air flotation is also used more, which is characterized by small footprint, high processing capacity and large impact load resistance.

9. Experimental air flotation: It is mainly used for qualitative and quantitative flight analysis of the air flotation feasibility of various types of wastewater.

10. Micro air flotation: mainly used for wastewater treatment with a small amount of water.

Compared with advection, the removal efficiency of high-efficiency shallow air flotation is higher, the operation is stable, the processing time is short, and the high-efficiency shallow air flotation can avoid the dead angle in the treatment process, and the treatment effect is better, and it is widely used in papermaking, printing and dyeing, food, chemical industry and many other fields.

<> shallow air flotation process.

The raw water enters by the central pipe at the bottom of the pond through flocculation and mixing, and the scum on the surface of the water is collected with a skimmer, and then discharged into the first sludge tank and discharged into the matching sludge device, and the sludge sunk at the bottom of the pool is collected by the scraper to the sludge discharge tank and discharged, and the clean water is collected and discharged by the first water collection mechanism. Flocculation raw water refers to the raw water formed by adding flocculation agent PAC or PAM to the raw water after 10-15 minutes of effective flocculation reaction. The specific dosage, flocculation time and flocculation effect must be determined by experiments.

Construction of a shallow air flotation device.

The shallow air flotation device integrates condensation, air flotation, slag skimming, sedimentation and mud scraping, and is cylindrical as a whole, with a compact structure and a shallow pool. The main body of the device is composed of five parts: the pool body, the rotating water distribution mechanism, the dissolved gas release mechanism, the frame mechanism, the water collection mechanism, etc.

The water inlet, outlet and scum discharge outlet are all concentrated in the first area of the pool body, and the water distribution mechanism, the water collection mechanism, and the dissolved gas release mechanism are closely connected with the frame and rotate around the pool body.

How it works. Air flotation separation technology refers to the air and water under a constant pressure condition, so that the gas is dissolved into the water to the maximum extent, and strive to be in a saturated state, and then the pressure dissolved air water formed by reducing pressure is released, producing a large number of fine bubbles, and the suspended floc in the water is fully contacted, so that the suspended floc in the water adheres to the microbubbles, and floats to the water surface together with the bubbles, forming scum and scraping off the scum to purify the water quality. Shallow air flotation is an advanced rapid air flotation system, on the basis of the traditional air flotation theory, and successfully use the "shallow theory" and "zero speed" principle, through careful design, set cohesion, air flotation, skimming, sedimentation, mud scraping as a whole, is a kind of water purification treatment of efficient equipment.

Shallow air flotation application range.

Shallow air flotation is widely used in water purification, domestic sewage, and industrial wastewater treatment. First, it should be used to remove algae and reduce turbidity in tap water with lake water as the water source; Second, it is used in industrial sewage treatment projects, such as petrochemical, textile, printing and dyeing, papermaking, slaughtering, tanning, food industry and other industries; Third, it is used in the field of useful substances in sewage, such as papermaking, fiber in white water, etc.

<> air flotation equipment, including air flotation tanks to complete the separation process and ancillary equipment to produce air bubbles. In water treatment, air flotation can be used in situations where the precipitation method is not applicable, to separate suspended solids with a specific gravity close to water and difficult to precipitate, such as grease, fiber, algae, etc., and can also be used to concentrate activated sludge.

The air flotation equipment presses high-pressure air into the dissolved air tank through the air compressor, and dissolves a large amount of air into the water through the releaser to suddenly depressurize and release quickly, and produces a large number of fine bubbles in the water, and the fine bubbles adhere to the impurities in the water after the mixing reaction, so that the specific gravity of the floc is less than 1, so as to float on the liquid surface and form a three-phase mixture of foam (i.e., gas, water and particles), so that the pollutant substances can be separated from the wastewater and achieve the purification effect. Add the coagulant to the wastewater and the dissolved air water of the dissolved air tank high pressure output at the same time in the air flotation equipment reaction and condensation, from the original limb condensation into the flocculation process is the working process of the air flotation device, the whole reaction of the original travel theory for the diffusion of agents, coagulation hydrolysis, impurity colloidal destabilization limb aggregation, micro flocculent collision and agglomeration, so that the colloidal particle diameter from microns to 2 mm floc quickly floating, sediment with scraping with slag machine regularly scraped and discharged, after the reaction flotation of the discharge water from the air flotation equipment in the sump automatically flowed out.

Air flotation equipment is mainly composed of three parts, namely pressure dissolved air system, dissolved air release system and air flotation separation system. The pressure dissolved air system of the air flotation device includes a water pump, an air compressor, a pressure dissolved air tank and other ancillary equipment, among which the pressure dissolved air tank is the key equipment that affects the dissolved air effect of the air flotation device. The dissolved gas release system is composed of a release gas and a dissolved air water pipeline.

There are three types of air flotation separation systems in the air flotation device series, namely advection type, vertical flow type and integrated type.

The air flotation equipment is suitable for electroplating wastewater treatment, papermaking wastewater treatment, printing and dyeing wastewater treatment, food slaughtering and other sewage treatment, water supply treatment, reclaimed water reuse, etc.

The complete set of air flotation device organically integrates the air flotation tank, dosing equipment, dissolved air tank, dissolved air pump and air compressor. This reduces installation time and effort. It occupies a small area, is easy to operate, and does not need to be a foundation.

As long as the user unit is connected to the inlet and outlet of the sewage with adjusted pH value, once debugged, it will operate normally without special management, and the operation will basically reach the state of automatic unmanned management.

Process characteristics. At present, the air flotation device of pressure dissolved air flotation method is the most widely used. Compared with other air flotation devices, this air flotation device has the following advantages:

1. Under pressurized conditions, the solubility of air is large, and the number of bubbles used for air flotation is large, which can ensure the effect of air flotation;

2. The dissolved gas is released by sudden decompression, and the bubbles produced are not only fine, uniform particle size, high density, but also stable floating, and have little disturbance to the liquid, so it is especially suitable for the solid-liquid separation of loose flocs and fine particles;

3. The process and equipment of air flotation equipment are relatively simple, which is easy to manage and maintain.