Flotation machine for sewage treatment

 

(57) Abstract:

The invention relates to flotation machines and apparatus for wastewater treatment. Flotation machine for sewage treatment includes body, divided into interconnected chambers. Inside cameras installed impeller units. In the first movement wastewater camera installed jet aerators. In the last - plate clarifier. At the entrance to the first chamber - nozzle for supply of dirty water. At the outlet of the last chamber is the outlet for the withdrawal of the clarified water. In the upper part of the housing has a groove for withdrawal of collected contaminants in the form of a foamy product. Between cameras installed grid, the minimum cell size which is 0.1 to 1.0 mm Perpendicular to the grids are grid-level, starting from the lower end to the middle of the height of the nets. Between the latter chamber and the outlet pipe is installed pocket with filtering the dispersed material. The particle size of the material does not exceed 0.5 - 5 mm For process intensification protocide material plate clarifier may be made of magnetic material, and the particles of the dispersed material of hydrophobic substances. The result image is nodepornh bubbles with dirt. 2 C.p. f-crystals, 1 Il.

The alleged invention relates to the field of wastewater treatment, and more particularly to a flotation machines and apparatus for sewage treatment.

For wastewater treatment using flotation machines and apparatus pressure-type electro-flotation, mechanical, etc. /Ksenofontov B. C. wastewater treatment: Flotation and sludge thickening M., Chemistry, 1992). Wastewater treatment in mechanical flotation machines in most cases is used when the waste water contains legkomotornye hydrophobic impurities such as fats, petroleum, oils, etc. In cases where waste water contains contaminants that before flotation to be aggregated, the use of such machines is undesirable because of the high turbulence flow in the cells, aggregates of particles are destroyed and the cleaning efficiency is sharply reduced. In this regard, mechanical flotation machines are primarily used for cleaning of oil and arostegui wastewater due to the high whys of ready floatability of particles present in these wastewaters.

The use of mechanical flotation machines for wastewater treatment telesource wastewater having a temperature in the range of about 30-60o. Under these conditions, the solubility of air and other gases in water decreases sharply and, consequently, the efficiency of wastewater treatment using pressure flotation machines and apparatus is reduced. When used in the processes of wastewater treatment electro-flotation machines and devices dramatically increases the energy intensity of wastewater treatment, and makes extensive use of this type of flotation equipment. It is also known application of pneumatic flotation machines, which, however, have a fairly low degree of wastewater treatment. In this regard, the use of mechanical flotation machines for cleaning legkomotornyh pollution effectively and confirmed by practice.

The closest technical solution to the alleged invention is a flotation machine for wastewater treatment, comprising a casing divided into interconnected chambers within which are mounted impeller units, and in the first movement wastewater camera installed jet aerators, and in the last - plate clarifier, and at the entrance to the first chamber - inlet pipe for supplying dirty and gutter for drainage of trapped impurities in the form of a froth product /patent RF 2091316, C 02 F 1/24, 27.09.97/. A significant disadvantage of the known flotation machine is the high turbulence in the cells, resulting in the destruction of aggregates of particle-bubble, and the fly ash with the clarified liquid is finely dispersed bubbles loaded with contaminants present in the wastewater.

To eliminate these disadvantages of the proposed flotation machine for wastewater treatment, comprising a casing divided into interconnected chambers within which are mounted impeller units, and in the first movement wastewater camera installed jet aerators, and the last plate clarifier, and at the entrance to the first chamber - nozzle for supply of dirty water, and at the outlet of the last chamber is the outlet for the withdrawal of the clarified water in the upper part of the body - trough output of trapped impurities in the form of a foam product, characterized in that between cameras installed grid the minimum cell size which is 0.1. . .1,0 mm, and perpendicular to them grating on the level, starting from the lower end to the middle of the height of the nets, and additionally between the latter chamber and the outlet pipe is installed pocket with filtering the dispersed material is stage clarifier may be made of magnetic material, and filtering the dispersed material substance that is not wetted by water, for example, PTFE balls and other materials with pronounced hydrophobic properties. In addition, to suppress the processes of vital activity of the microflora in the water surface of the filter material is covered with a substance having the properties of inhibitors of microorganisms. For more effective separation of the foam product from the purified water foam threshold is decreasing height from the first chamber (1...3 see above) and ending with the last camera (1...3 cm below the middle height of the froth threshold).

The proposed flotation machine for wastewater treatment consists of a body 1 divided by the camera 2, in which the installed impeller blocks 3 placed inside them by the impellers 4, driven in rotational motion by means of a motor 5 (see drawing). Photomachine contains four cameras, a lamellar clarifier 6. In the first input chamber installed collector 7, the top is attached to inlet pipe 8, and the bottom four tubular aerator 9. Between cameras is a through hole, which is covered by the grids 10. The minimum size of the holes of the mesh is in the range of 0.1...1, the Central Asia to the middle of the height of the nets. Screening area gratings is 15...45% of the total area of the grating. Between the chamber containing lamellar clarifier 6, and the outlet pipe 12 additionally has a pocket 13 in which is placed a filter dispersed material 14 with a particle size of 0.05...0.5 mm the surface of the particles of the dispersed material coated with substances, non wettable (hydrophobic) water with any abscopal for microorganisms properties.

In the upper part of the body photomachine installed trough 15, the height of the overflow threshold 16 opposite the first chamber above 1...3 cm in front of the camera, containing a lamellar clarifier below 1...3 cm average height of the overflow threshold.

The principle of the proposed flotation machine consists in the following. The original (dirty) waste water at a pressure of about 0.2 MPa through pipe 8 supplies the first cell, flotation machine, where due to jet expiration occurs turbulization and the dispersion of the gas-liquid mixture. Due to the joint action of rotation of the impeller 4 and the leakage of the fluid through the tubular aerators, United in the reservoir 7, the formation of fine bubbles by splitting the hcpa is existing in the wastewater, in particular, fats and petroleum products. The resulting flotation complexes droplets (particles) pollution - air bubbles to the surface, forming a foam layer, which is poured by gravity through the foam threshold of 16, getting into the groove 15.

The effectiveness of the proposed flotation machine is to improve the level of wastewater treatment, in particular the concentration of oil products in purified water using flotation machines of the proposed design 1.5...1.8 times lower than in the water, last cleaned in known photomachine.

1. Flotation machine for wastewater treatment, comprising a casing divided into interconnected chambers within which are mounted impeller units, and in the first movement wastewater camera installed jet aerators, and in the last - plate clarifier and at the entrance to the first chamber - nozzle for supply of dirty water, and at the outlet of the last chamber is the outlet for the withdrawal of the clarified water in the upper part of the body - trough output of trapped impurities in the form of a foam product, characterized in that between cameras installed grid the minimum cell size which is 0.1 - 1.0 mm, perpendicular to them grating on the output pipe is installed pocket with filtering the dispersed material, the particle size of which does not exceed 0.5 - 5 mm

2. Machine under item 1, characterized in that the lamellar clarifier is made of magnetic material.

3. Machine under item 1, characterized in that the particle filter dispersed material is made of hydrophobic substances.

 

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FIELD: mining industry; metallurgy; food and other industries.

SUBSTANCE: the invention concerns to the devices for a flotation of materials and may be used in mining, metallurgical, food and other industries. The technical result is decreased power input at maintaining a high quality of dispersion, and increased productivity of the machine. The flotation machine contains a chamber and an aeration unit consisting of a stator and an impeller mounted in respect to each other with an axial and a radial clearance. In the upper part of the impeller on blades there is a ring-type element, the width of which is more than 1/2 lengths of a blade of an impeller. The internal diameter of the ring is equal to the diameter, which forms an internal butt surface of a blade of the impeller, and above the ring-type element there is the circulation pipe.

EFFECT: the invention ensures a decrease of power input at maintaining a high quality of dispersion, increased productivity of the machine.

1 dwg

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