Qingtian company since its inception in 1995, has produced more than 600 air flotation machine, nearly 300 cities in more than 500 companies using our equipment, Qingtian company is the domestic production of THAF type cavitation air flotation machine and cavitation aerator manufacturers, has nearly 20 years of production history, product technology mature, stable performance, reliable quality, products for major environmental protection design companies, engineering companies and * end users, the price is real, quality * good, welcome to inquire!
Knowledge development:
What is air flotation?
Flotation method is the first stage of sewage treatment, belonging to the category of physical treatment, can only remove most of the suspended solids and a small part of COD and BOD. Strictly speaking, the treated water cannot be discharged directly and cannot meet the standard. It can only be used as pretreatment for secondary and tertiary biochemical treatment. But pretreatment is a necessary step of sewage treatment, and the result of pretreatment is directly related to the effect of subsequent biochemical treatment. Therefore, air flotation machine is an essential general environmental protection equipment in sewage treatment.
Flotationmethod uses highly dispersed microbubbles as carriers to removepollutantsfrom adhered wastewater, making its density less than water and floating to the surface to achieve solid-liquid or liquid-liquid separation. Flotationprocess includes bubble generation, bubble and particle (solid or droplet) adhesion and flotation separation of successive steps. There are two necessary conditions to realize the separationof air flotation method: first, a sufficient number of fine bubbles must be provided to the water, and the ideal size of the bubbles is 15~30 m; second, the target must be suspended orhydrophobic, so as to adhere to the bubbles and float. In water treatment,air flotation method is widely used in:① separation of finesuspended solids, algae and micro-flocs in surface water;② recovery of useful substances inindustrial wastewater, such aspulp fibers andfillers inpaper millwastewater;③ replacement ofsecondary sedimentation tank, separation and concentration of residualactivated sludge, especially suitable forbiochemical treatment processes that are prone tosludge bulking;④ separation and recovery of suspended oil andemulsified oilin oily wastewater; 5 separation and recovery of molecular or ionic targets, such assurfactants andmetal ions.

Compared withprecipitation method, what are the characteristicsof air flotationmethod?
(1) Because thesurface loadof theflotation tank is very high, the retention time of water in the tank is only 10~20min, and the depth of the tank is only about 2m, so the occupied area is less, savingcapital investment;(2) Theflotation tank haspre-aeration effect, and the effluent and scum contain a certain amount of oxygen, which is beneficial to subsequent treatment or reuse, and the sludge is not easy to corrupt;(3) For those low-turbidity algae-containing water that is difficult to be removed bysedimentation method, the flotation method has high treatment efficiency, and even can removeplanktonin raw water, and the effluent quality is good;(4) The scummoisture content at the bottom of the tank is low, generally below 96%, which is 2~10 times less thanthe sludgevolumeof the sedimentation tank, which is beneficial to the subsequent treatmentof sludge, and it isconvenient to scrape the sludge on the surface;(5) Useful substances can be recycled;(6) The amount of chemicals required by the flotation method is less than thatof the sedimentation method. However, the air flotation methodconsumes more power, 0.02~0.04kw/h more power consumption per ton of wastewater than the precipitation method; the dissolved air water decompressionrelease devicecurrently used is easy to block; the scum is afraid of greater wind and rain attack.


THAF series cavitation air flotation machine brief introduction
 THAF type cavitation air flotation machine is the main product of our company. Since the establishment of the company in 1995, nearly 600 sets of cavitation air flotation machines of various specifications have been produced, which have been applied in the field of sewage treatment all over the country and achieved good results. It is equipped with vortex aerator.

THAF type cavitation air flotation machine adapts to industries:
Paint, leather, oil refining, printing and dyeing, chemical, dairy processing, fiber production, paper, food, beverage, slaughtering, textile, mechanical processing, municipal sewage.
THAF air flotation machine is specially designed for removing grease, colloid and suspended solids from industrial and municipal wastewater. The device can automatically separate these substances from wastewater and make them suitable for separate treatment. Since the presence of these substances can significantly reduce the efficiency of sewage treatment plants, it is essential to remove them beforehand by pretreatment machines. In other words, removal of these substances can significantly reduce pollution loads, thus allowing wastewater to meet the requirements for discharge into municipal pipelines or for biochemical treatment.
THAF cavitation flotation can greatly reduce BOD and COD contents in industrial water with the help of chemical flocculation, thus reducing sewage costs. Furthermore, THAF can help industry treat wastewater to within discharge standards and significantly reduce operating costs. Another important aspect is that by-products from wastewater treatment can often be recycled, reused and sold.
The basic principle of THAF is an innovation. Its unique design cleverly solves the technical and economic problems encountered in the past solid air flotation. In addition, THAF is the most economical of all the air flotation technologies available today, both in terms of investment and operating costs.
THAF is specially designed according to the needs of industry. It is not only high efficiency, simple equipment, but also easy to operate and maintain. It is especially suitable for the national conditions of China. It is an effective way for wastewater treatment in industry. THAF cavitation airfoils not only enjoy a high reputation in the United States, but also have a wide range of applications all over the world. With the current government's increasingly stringent wastewater discharge requirements, industrial enterprises are facing increasing pressure, THAF air flotation machine is the best choice to get the plant out of this situation.

Advantages of THAF type cavitation air flotation machine
A. Investment savings
THAF type cavitation air flotation machine can remove grease, suspended solids, BOD and COD in sewage. If this machine is installed in front of biochemical secondary sewage treatment plant, the scale of treatment plant can be greatly reduced, thus greatly reducing the overall investment cost. Rotary flotation does not need pressure vessels, air compressors, circulating pumps and flocculation equipment, thus greatly reducing the investment costs of sewage pretreatment.
B. Low operating costs
The whole cavitation machine only needs the power of a few ordinary motors. Maintenance and manual operation are minimal.
C. High efficiency
In contrast to conventional grease collectors (gravity settling tanks and separation tanks), CAF machines automatically and continuously remove solid sludge from wastewater. Sludge removal and storage is carried out in a concentrated manner, thus reducing the cost of sludge treatment.
D. Simple operation
THAF is very easy to operate, no complicated machinery or manual intervention is required. The whole machine is composed of only two mechanical parts, unlike the dissolved air flotation machine, which includes many necessary equipment such as pressure vessels, air compressors and circulating pumps. Do not need to clean the nozzle and dissolved gas release device, can be started immediately, can be closed frequently
E. Good working environment, no noise.
The treatment of wastewater by THAF cavitation flotation machine is an aerobic process. The odor problem generated by the grease trap (gravity settling tank and separation tank) has been well solved. On the other hand, the power of the equipment is very small, and there is only a slight motor sound when running, and there is no noise pollution.
F. Affordability
THAF type cavitation air flotation machine is simple in design, good in matching, and very few in civil engineering for the machine. It is very attractive from the point of view of investment. Due to its simplicity and integrity, it can be installed on the ground, underground or high and takes very little time.
Therefore, THAF is not only simple equipment, but also very easy to operate and maintain, which is the best choice for industrial and municipal wastewater treatment. In addition, compared with other traditional air flotation technologies, both in terms of operating costs and ease of operation, have strong advantages.
The following is a comparison of several air flotation machines
This comparison is based on 2000 tons/day equipment without chemical feed system

 

  
Performance of THAF Series Cavitation Air Flotation Machine
 The standard throughput of each THAF cavitation air flotation machine can reach 500 cubic meters per hour. According to customer requirements can be designed to handle higher machine. The amount of water entering the cavitation air flotation machine does not need to be balanced, and even if the flow rate changes, the machine performs equally well. The oil and suspended solids are removed, and the COD and BOD loads are greatly reduced.
 THAF cavitation air flotation machine * is suitable for sewage pretreatment. In the meat processing industry, for example, it is critical to remove fat and suspended solids prior to conventional biochemical treatment. Often, the question is whether to install the fine grating before or after the fat collector. The former is when the grating is clogged with grease, the latter when the collector is clogged with suspended solids (sludge). Cavitation flotation machines have the ability to remove grease and sludge simultaneously, eliminating the need for grills and grease traps in most cases.
A large number of facts have proved that the cavitation air flotation machine is extremely effective in untreated dairy wastewater and greatly improves the effectiveness of traditional sewage treatment plants.
The unique vortex aerator has a high oxygen transfer rate. When used in the leather industry, the machine can remove solid suspensions and promote the oxidation of sulfides.
For different wastewater, the BOD rate can reach more than 60% in the pretreatment stage by using appropriate chemicals, flocculants and coagulants. THAF cavitation flotation machine combined with chemical agents such as flocculation added flocculant adding equipment, no matter the wastewater in continuous state or serious pollution load exceeds the emergency state, can remove BOD very well. Flocculants are added and the gel will adsorb onto fats, oils and suspensions and float together.
The whole equipment consists of four parts:
a) Aerating section   b) Air-floating section   c) Chain mud scraper    d) Screw propulsion solid slag extractor


Main technical parameters:
1, machine * large sewage treatment capacity 500m3/h; machine * small sewage treatment capacity 5m3/h.
2, aerator spindle speed 1420r/min.
3. The linear speed of mud scraper is 1m 25.8 m/min per minute (stepless speed regulation).
4, screw propeller speed 24r/min.


Working Principle of THAF Cavitation Air-float Machine
Raw sewage first enters a small aeration stage equipped with a vortex aerator. Sewage flows through the aeration section as it rises, where it mixes well with microbubbles generated by the aerator. Aerators transfer air from the surface to the bottom of the water through exhaust pipes. The working principle of the aerator is to form a vacuum zone in the water by using the high-speed rotation of the diffuser impeller at the bottom of the air conveying pipe. The air on the liquid surface is input into the water through the aerator to fill the vacuum. Microbubbles are generated and spiral up to the water surface. The oxygen in the air also enters the water.
Because of the density imbalance between the gas-water mixture and the liquid, a vertical upward buoyancy force is generated, which carries the solid suspension to the surface. In the process of floating, microbubbles will attach to the suspended matter. After reaching the water surface, the solid suspended matter will rely on these bubbles to support and maintain the water surface, and will be removed by radial airflow thrust.


Suspended solids floating on the water surface are removed intermittently by chain scrapers. The scraper moves along the entire liquid surface and pushes the suspension from the inlet end of the flotation tank to the outlet end. Scraper blades are fixed to the ends of the chain. The sludge scraper is a gear driven by a gear reducer mounted on one side of the tank. The scraper moves along the entire width of the tank, scraping the floating suspension onto the inclined metal plate and pushing it into the sludge discharge pipe. There is a horizontal screw propeller (slag remover) in the sludge discharge pipeline, which sends the collected sludge to the sludge collector (slag remover). The screw propeller (slag remover) is also driven by the reducer. The purified sewage enters the overflow tank through an outlet under the metal plate before being discharged. The overflow tank is used to control the water level of the air flotation tank to ensure that the liquid in the tank does not flow into the sludge discharge pipe.


Qingtian company since its inception in 1995, has produced more than 600 air flotation machine, nearly 300 cities in more than 500 companies using our equipment, Qingtian company is the domesticproduction of cavitation air flotation machine and cavitation aerator manufacturers, has nearly 20 years of production history, product technology mature, stable performance, reliable quality, products for major environmental design companies, engineering companies and * end users, the price is real, quality * good, welcome to inquire!