Device for biological treatment of concentrated wastewater containing volatile organic pollutants

 

(57) Abstract:

The invention relates to a device for biological wastewater treatment and can be used for the purification of highly concentrated wastewater enterprises of chemical and petrochemical industry. Device for biological treatment of concentrated and contain volatile organic pollutants of wastewater is a reactor body in the center of which is located a vertical annular partition dividing the reaction space into zones flotation and aeration, equipped with Windows inlet sludge liquid. In the center of the housing above the partition plate is. In the middle of the body is a pipe connected to the pipe feeding the water to be purified, connected with the inlet of the circulation pump, the output of which is connected to the contour irrigation top of the reaction zone, in the form of nozzles located along the perimeter of the annular partition, and distribution pipeline, located at the bottom of the reactor, the perimeter of which is radially located branches with pipes. At the bottom of the reactor in the centre of the pipe for discharge of treated water. The supply air is made in the form is perimetro reactor in the unsaturated zone. In the zone of aeration is the attachment for biomass. The reactor vessel is closed by a cover with the challenge, which connects it to the biofilter. These new design features of the device can effectively clean concentrated wastewater containing volatile impurities. 1 Il.

The invention relates to a device for biological wastewater treatment and can be used for the purification of highly concentrated wastewater enterprises of chemical and petrochemical industry.

The known device for biological wastewater treatment, protected auth. mon. USSR N 567675 (MKI4C 02 F 3/02, B 01 D 21/00, from 27.02.75 N 2108351/26, publ. 05.08.77. Bull. N 29) /1/ N 1373694 (MKI4C 02 F 3/02, from 16.07.86 N 4142673/31-26, publ. 15.02.88. Bull. N 6.) /2/ and N 1574547 (MKI5C 02 F 3/34, from 28.12.87 N 4350778/31-26, publ. 30.06.90. Bull. N 24) /3/ representing tanks, who to a certain extent divided by partitions formed in the internal volume of the tank different zones, allowing one reactor to carry out the processes of aerobic degradation of pollutants and clarification of the treated water. A disadvantage of the known devices 1 to 3 is that they are intended only for wastewater treatment the biomass that eno is also in these devices it is impossible to clean wastewater containing volatile impurities, since these devices are open type.

Auth. mon. N 1174385 (MKI4C 02 F 3/02, from 29.03.84 N 37179/23-26, publ. 23.08.85. Bull. N 31.) /4/ and N 1201235 (MKI4C 02 F 3/26, from 12.06.84 N 3754341/23-26, publ. 30.12.85. Bull. N 48) /5/ protects device for biological wastewater treatment, including the reactor walls, separating the camera clarification and flotation, in which in a certain direction moves loose biomass. In such devices it is impossible to clean concentrated waste water, since biomass is not fixed, and therefore, it is impossible to create a high concentration. These devices are open type, so they cannot be cleaned wastewater containing volatile impurities.

Disadvantages devices /4/, /5/ partially removed in sewage treatment plants /6/ (ed. mon. USSR N 1776640, MKI5C 02 F 3/04, from 04.12.90 N 4886941/26, publ. 23.11.92. Bull. N 43), /7/ (ed. mon. N 1305132, MKI4C 02 F 3/12, from 12.06.85 N 3909533, publ. 23.04.87. Bull. N 15.), /8/ (ed. mon. N 1212977, MKI4C 02 F 3/12, from 18.07.84 N 3771790, publ. 23.02.86. Bull. N 7) /9/ (U.S. Pat. RF N 1787139, MKI5C 02 F 3/02, from 30.04.91 N 4932849/26, publ. 07.01.93. Bull. N 1), /10/ (ed. mon. N 1036687, MKI3C 02 F 3/02, 26.04 what Okami, which divide the reactor into zones flotation and aeration include devices that allow to regulate the concentration of biomass, in particular, by its immobilization on any of the Packed material. Each device provides a circulating path for returning the circulating activated sludge. These devices are not available for treatment of wastewater containing volatile impurities, because they are open.

The closest technical solution is a device for biological wastewater treatment /11/ (application Germany N 3428798, MKI4B 01 D 53/34, prior. from 26.01.84 N 3402712, publ. 01.08.85), including the reactor, representing a rectangular container with a stirrer, above which is mounted a filter for cleaning the exhaust air. To the vessel summed up the pipeline system for delivery to the treatment of waste water and air. The air supply line connected to the distribution device located at the bottom of the reactor and containing the electrodes, generating oxygen.

A significant drawback of the known device is that the installation of such structures does not clear the concentrated waste water, since it is impossible to create high-dose aktivirovannyh and containing volatile organic pollutants of wastewater representing the reactor body in the center of which is located a vertical annular partition dividing the reaction space into zones flotation and aeration, the diameter of which is 1/5 - 1/6 of the diameter, provided at a height equal to 3/4 the height of the walls, Windows inlet sludge liquid in the center of the housing above the partition is a plate diameter equal to 1,05 - 1,1 diameter annular walls, in the middle of the body is a pipe connected to the pipe feeding the water to be purified, connected with the inlet of the circulation pump, the output of which is connected to the contour irrigation top of the reaction zone, in the form of nozzles, located on the perimeter of the annular partition, and distribution pipeline, located at the bottom of the reactor, made in the form of a ring, the perimeter of which is radially located branches with nozzles directed in one direction parallel to the bottom of the reactor, at the bottom of the reactor in the centre of the pipe for discharge of treated water, the supply of air, made in the form of pipes, provided with a dispersant, is located in the area of flotation above the pipe outlet of purified water and along the perimeter of the reactor in the zone of aeration, with PE, the which connects it to the biofilter.

These new design features of the device can effectively clean concentrated wastewater containing volatile impurities.

Effective treatment of concentrated wastewater is achieved by the design of the reactor with an additional annular partition dividing the area of the reactor zone flotation and aeration in the aeration zone is placed immovable material for microorganisms, allowing to create high dose biomass, and in the area of flotation happen separation of purified water gone from biomass and the return of biomass to the aeration zone.

Such design of the reactor allows to exclude from installation of industrial wastewater treatment secondary clarifier, because its function now performs site flotation reactor for wastewater treatment.

Nozzle for biomass may represent, for example, parallel spaced bars forming the grate with a rigid Foundation on which stretched immovable material in the form of ruffs, for example, fiberglass or synthetic materials. The nozzle may be fixed, for example, on the side wall of the reactor.

The window for the look of the vadose zone in the area of flotation.

Deodorization and decontamination of air emissions are achieved due to the fact that the reactor for wastewater treatment cover with the outlet through which the air is fed to the biofilter exhaust air. The suction air can be carried out in any known manner, for example by means of the fan.

When comparing the essential characteristics of the invention:

- the lid of the reactor for wastewater treatment includes drainage, connecting it to the bioreactor for exhaust air;

- the diameter of the vertical annular walls is 1/5 - 1/6 of the diameter of the reactor for wastewater treatment;

the partition is provided with Windows for inlet sludge liquid at a height equal to 3/4 of the height partitions;

in the center of the reactor over a partition is a plate diameter equal to 1,05 - 1,10 diameter annular partition;

- in the middle of the reactor is a pipe connected to the pipe feeding the water to be purified, connected with the inlet of the circulation pump;

the output of the circulation pump is connected to the contour irrigation of the top of the reactor;

- loop irrigation of the top of the reactor in the form of nozzles, located on Perry the ring on the perimeter of which is radially located branches with nozzles directed in one direction parallel to the bottom of the reactor;

- outlet for discharge of treated water is located at the bottom of the reactor in the center;

the supply air is made in the form of pipes, provided with a dispersant, and is located in the area of flotation above the pipe outlet of purified water in the unsaturated zone on the perimeter of the reactor;

in the unsaturated zone is the attachment for biomass

with signs of the prototype revealed that they are new and are not described in the prototype, so you can make a conclusion about conformity of the proposed technical solution the criterion of "novelty".

Comparison of the proposed invention with the prior art shows that the above features are absent in the known technical solutions and their combination in the inventive device allows to solve the problem of purification of highly concentrated wastewater containing odorous pollutants that indicates compliance of the proposed invention the criterion of "inventive step".

The proposed solution is illustrated by the drawing, which shows a device for biological treatment of concentrated stock the exact waters, which through the pipe 2 in the lid 3 is connected to the biofilter 4 for exhaust air. The reactor 1 for wastewater treatment contains an annular wall 5, installed in the center of the reactor and divides it in the unsaturated zone 6 and zone flotation 7. An annular partition provided with Windows 8 inlet sludge liquid, and above the partition plate is 9. In the middle of the reactor, in the unsaturated zone 6, is a pipe 10 connected to the supply pipe treated water 11, which, in turn, is connected to the inlet of the circulation pump 12, the output of which is connected to the contour irrigation of the top of the reactor 13 and the distribution pipe 14 at the bottom of the reactor and which contains branches with the sockets On the bottom of the reactor in the zone of the flotation is a pipe 15 for discharge of treated water. Above the nozzle 15 in the flotation zone and along the perimeter of the reactor in the zone of aeration system installed supply air, made in the form of nozzles 16, provided with a dispersant. In the unsaturated zone is fixed to the nozzle 17, made in the form of parallel spaced bars forming the grate with a rigid Foundation on which stretched immovable material in the form of ruffs made of fiberglass or synthetic materials.

is westline technical solutions is confirmed by the description of his work.

Industrial waste water, air pollution which in COD up to 20 thousand mg/l, containing in its composition ethylbenzene 0,002 - 0,003% by weight, styrene of 0.004 - 0.005 wt.%, methylphenylcarbinol of 0.03 - 0.06 wt.%, the acetophenone 0,006 - 0.03 wt.%, propylene glycol 0,9 - 1,05 wt.%, phenol 0.08 to 0.1 wt.% and other impurities, is fed to the inlet of the circulation pump 12, designed for intensive mixing of the source of wastewater and bacterial suspension entering the pump inlet of the aeration zone 6 through the pipe 10. Biomass partially circulates water, partially immobilized on the nozzle 17, made in the form of parallel spaced bars forming the grate with a rigid Foundation on which stretched immovable material in the form of ruffs made of fiberglass or synthetic material that allows you to create high dose biomass in the aeration zone 6. For the separation of suspended biomass from the treated water, the bacterial suspension is fed into the flotation zone 7 through Windows 8, biomass with air bubbles rises up and shines through the top ring of the partition 5 in the unsaturated zone 6. Plate 9 above the annular partition reflects the foam and contributes to the direction of its movement to the location of the system defoaming 13. The clarified water is rbinom 0,005 - 0.01 wt.%, propylene glycol 0.3 to 0.6 wt.%, phenol 0,006 - 0,01 wt.% from the bottom of the flotation zone 7 through the pipeline 16 is diverted into the sewer. In the aeration zone 6 and flotation 7 forced air is supplied through the pipeline with the pipe 16, is equipped with a dispersant. The exhaust air from the reactor 1 containing in its composition, for example, ethylbenzene is 0.87 mg/l, styrene and 0.40 mg/l, through a pipeline that goes on clearance in bulk biofilter 4, made of natural materials. In the biofilter 4 is the process of cleaning and deodorization of air emissions. The purified air after biofilter 4, containing, for example, ethylbenzene 0.05 mg/l, styrene 0.01 mg/l, emitted into the atmosphere.

As can be seen from the above example, the structural features of the present invention can reduce the pollution of waste water before discharging it into the sewer, on average, 75 - 85%, and air emissions from the reactor at 85 - 95%.

Device for biological treatment of concentrated and contain volatile organic pollutants of wastewater, including the reactor for wastewater treatment and biofilters for waste air treatment system piping for supply and distribution wastewater, air, drain cleansing the wife of the vertical annular wall, diameter which is 1/5 - 1/6 of the diameter, provided at a height equal to 3/4 the height of the walls, Windows inlet sludge fluid, and the center of the reactor over a partition is a plate diameter equal to 1,05 - 1,1 diameter annular walls, in the middle of the reactor is a pipe connected to the pipe feeding the water to be purified, connected with the inlet of the circulation pump, the output of which is connected to the contour irrigation of the top of the reactor, made in the form of nozzles located along the perimeter of the annular partition, and distribution pipeline, located at the bottom of the reactor, made in the form of a ring, on the perimeter of which is radially located branches with nozzles directed in one direction parallel to the bottom of the reactor, at the bottom of the reactor in the centre of the pipe for discharge of treated water, and the supply of air, made in the form of pipes, provided with a dispersant and located in the zone of the flotation above the pipe outlet of purified water and along the perimeter of the reactor in the zone of aeration, zone of aeration is the attachment for biomass.

 

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FIELD: waste water treatment.

SUBSTANCE: method us intended for use in municipal economy, hydropower engineering, oil fields, and petroleum processing industry to reduce amounts of impurities discharged into fish-industry reservoirs. Method comprises creating, in open drainage channels, curtains with developed surfaces for immobilization of microorganisms, controlling amount of biomass secured on curtains in accordance with water-dissolved oxygen, establishing hydraulic-mode travel of water in open drainage channel ensuring optional utilization of the latter in the waste water treatment process. Biological treatment is accomplished by biocenosis attached to wire-brush curtains located in displaceable containers. Curtains are installed along the drainage channel with intervals allowing saturation of water with oxygen. Removal of excess biomass and deposits from wire brushes is accomplished by removing containers from the channel, placing them into water-filled tank, and regenerating were threads of brush by bubbling surrounding water, after which containers are reinstalled in the channel. Thickening of accumulated removed insoluble matters is achieved by circulation of polluted water from tanks through filter presses introducing intermediate flocculant treatment.

EFFECT: increased stability of post-treatment process and facilitated removal of accumulated deposits.

2 cl, 1 dwg

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