RU2121460C1 - Installation for biologically treating concentrated waste waters containing volatile organics - Google Patents

Abstract

FIELD: waste water treatment. SUBSTANCE: installation consists of reactor with vertical annular partition in the center of its casing separating reaction space into flotation and aeration zones and provided with sludge fluid inlet port. Above the partition, in the center of casing, a tray is placed. In the middle of casing, there is also a connection pipe connected with waste water-supply pipeline which is, in turn, connected with aspiration line of circulation pump whose discharge line is connected to sprinkling circuit of the top of reaction zone and distributive pipeline located on the bottom of reactor and carrying peripherally disposed and radially oriented branch pipes. Sprinkling circuit is constructed in the form of nozzles disposed peripherally on annular partition. Discharge pipe for cleaned water is located on the central part of bottom of reactor. Air-supply system in the form of connection pipes provided with dispersers is located in the flotation zone above cleaned water-discharge pipe and peripherally with regard to reactor in the aeration zone. The latter also encloses biomass-admission attachment. Reactor casing is closed by cover with branch pipe connected to biofilter. EFFECT: enhanced waste water treatment efficiency. 1 dwg

Description

 The invention relates to devices for biological wastewater treatment and can be used for the treatment of highly concentrated wastewater from chemical and petrochemical industries.

Known devices for biological wastewater treatment, protected by auth. testimonial. USSR N 567675 (MKI ⁴ C 02 F 3/02, B 01 D 21/00, dated 02.27.75 N 2108351/26, publ. 05.08.77. Bull. N 29) / 1 /, N 1373694 (MKI ⁴ C 02 F 3/02, from 16.07.86 N 4142673 / 31-26, publ. 15.02.88. Bull. N 6.) / 2 / and N 1574547 (MKI ⁵ C 02 F 3/34, from 28.12.87 N 4350778 / 31-26, published on June 30, 90. Bull. N 24) / 3 /, which are reservoirs that are separated in a certain way by partitions, forming various zones in the internal volume of the reservoir, which allow carrying out aerobic degradation of pollutants and clarification processes in one reactor purified water. A disadvantage of the known devices 1 to 3 is that they are intended only for wastewater treatment with that biomass, which is quickly separated by precipitation, since these devices do not provide for separation of biomass by flotation. In addition, in these devices it is impossible to treat wastewater containing volatile contaminants, as these are open type devices.

Auth. testimonial. N 1174385 (MKI ⁴ C 02 F 3/02, dated 29.03.84 N 37179 / 23-26, publ. 23.08.85. Bull. N 31.) / 4 / and N 1201235 (MKI ⁴ C 02 F 3/26 , dated 12.06.84 N 3754341 / 23-26, publ. 30.12.85. Bull. N 48) / 5 / protect devices for biological wastewater treatment, including a reactor with partitions that divide it into clarification and flotation chambers, in which a loose biomass moves in a certain direction. On such devices it is impossible to treat concentrated wastewater, since the biomass is not fixed, and, therefore, it is impossible to create its high concentration. These devices are open type, therefore it is impossible to treat wastewater containing volatile contaminants on them.

The disadvantages of the devices / 4 /, / 5 / are partially solved in the wastewater treatment devices / 6 / (ed. Certificate of the USSR N 1776640, MKI ⁵ C 02 F 3/04, dated 04.12.90 N 4886941/26, publ. 23.11 .92. Bull. N 43), / 7 / (ed. Certificate N 1305132, MKI ⁴ C 02 F 3/12, dated 12.06.85 N 3909533, publ. 23.04.87. Bull. N 15.), / 8 / (ed. Certificate No. 1212977, MKI ⁴ C 02 F 3/12, dated July 18, 84 No. 3771790, publ. 23.02.86. Bull. No. 7) and / 9 / (US Pat. RF N 1787139, MKI ⁵ C 02 F 3/02, dated 04/30/91 N 4932849/26, publ. 07.01.93. Bull. N 1), / 10 / (ed. Certificate N 1036687, MKI ³ C 02 F 3/02, dated 26.04 .82 N 3428955 / 23-26, publ. 23.08.83. Bull. N 31), which are reactors with a certain installed partitions, which divide the reactor zone into flotation zones and aeration, include devices that allow you to control the concentration of biomass, in particular, by immobilizing it on any packed material. Each device has a circulation circuit for returning circulating activated sludge. These devices do not provide for the treatment of wastewater containing volatile contaminants, since they are open.

The closest technical solution is a device for biological wastewater treatment / 11 / (application Germany N 3428798, MKI ⁴ B 01 D 53/34, prior. From 26.01.84 N 3402712, publ. 01.08.85), including a reactor, which is a rectangular container with a stirrer, over which a biofilter for cleaning the exhaust air is installed. A system of pipelines for supplying wastewater and air to the treatment has been brought to the tank. The air supply pipe is connected to a switchgear located at the bottom of the reactor and containing electrodes generating oxygen.

 A significant disadvantage of the known device is that the installation of this design does not allow the purification of concentrated wastewater, since it cannot create high doses of activated sludge in solution.

 The essence of the invention is a device for biological treatment of concentrated and containing volatile organic pollutants of wastewater, which is a reactor in the center of which there is a vertical annular partition dividing the reaction space into flotation and aeration zones, the diameter of which is 1/5 - 1/6 of the diameter of the case equipped with windows for sludge liquid inlet at a height equal to 3/4 of the height of the partition, a plate with a diameter of 1.05 - 1.1 diameters to of the septum partition, in the middle of the casing there is a nozzle connected to the purified water supply pipe, connected to the inlet of the circulation pump, the outlet of which is connected to the irrigation circuit of the top of the reaction zone, made in the form of nozzles located around the perimeter of the annular partition, and with a distribution pipe located at the bottom the reactor, made in the form of a ring, along the perimeter of which branches are radially arranged with nozzles directed to one side parallel to the bottom of the reactor, at the bottom of the reactor In the center, there is a nozzle for discharging purified water, an air supply system made in the form of nozzles equipped with dispersants is located in the flotation zone above the nozzle for discharging purified water and along the perimeter of the reactor in the aeration zone, while a nozzle for biomass, and the reactor vessel is closed by a cover with a tap that connects it to the biofilter.

 Such new design features of the device make it possible to efficiently treat concentrated wastewater containing volatile contaminants.

 Effective purification of concentrated wastewater is achieved due to the design of the reactor with an additional annular partition dividing the reactor zone into flotation and aeration zones, while immobilizing material for microorganisms is placed in the aeration zone, which allows creating a high dose of biomass, and purified water is separated from the flotation zone carried away biomass and return of biomass to the aeration zone.

 This design of the reactor eliminates the need for a secondary sump from the industrial wastewater treatment plant, since its function is now performed by the flotation unit in the reactor for wastewater treatment.

 The nozzle for biomass can be, for example, parallel to the rods, forming a lattice with a rigid base, which is pulled immobilizing material in the form of ruffs, for example, fiberglass or synthetic materials. The nozzle can be mounted, for example, on the side wall of the reactor.

 The sludge inlet windows can be any form of openings allowing the liquid to flow freely from the aeration zone to the flotation zone.

 Deodorization and neutralization of air emissions are achieved due to the fact that the wastewater treatment reactor is closed with a lid with a tap through which air is supplied to the exhaust air purification biofilter. The suction of air can be carried out in any known manner, for example using a fan.

When comparing the essential distinguishing features of the invention:
- the lid of the reactor for wastewater treatment contains an outlet connecting it to the bioreactor for treating exhaust air;
- the diameter of the vertical annular partition is 1/5 - 1/6 of the diameter of the reactor vessel for wastewater treatment;
- the partition is provided with windows for the intake of sludge liquid at a height equal to 3/4 of the height of the partition;
- in the center of the reactor above the partition there is a plate with a diameter equal to 1.05 - 1.10 of the diameter of the annular partition;
- in the middle of the reactor vessel there is a nozzle connected to the purified water supply pipe connected to the inlet of the circulation pump;
- the output of the circulation pump is connected to the irrigation circuit of the top of the reactor;
- the irrigation circuit of the top of the reactor is made in the form of nozzles located around the perimeter of the annular partition;
- at the bottom of the reactor is a distribution pipe, made in the form of a ring, along the perimeter of which branches are radially arranged with nozzles directed in one direction parallel to the bottom of the reactor;
- a pipe for discharging purified water is located at the bottom of the reactor in the center;
- the air supply system is made in the form of nozzles equipped with dispersants, and is located in the flotation zone above the nozzle for the removal of purified water and in the aeration zone around the perimeter of the reactor;
- in the aeration zone is a nozzle for biomass
with the signs of the prototype revealed that they are new and not described in the prototype, therefore, we can conclude that the proposed technical solution meets the criterion of "novelty."

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

 The proposed technical solution is illustrated by the drawing, which shows a device for the biological treatment of concentrated wastewater containing volatile organic pollutants.

 The device includes a reactor 1 for wastewater treatment, which is connected through a pipe 2 in the lid 3 to a biofilter 4 for treating exhaust air. The wastewater treatment reactor 1 comprises an annular baffle 5 mounted in the center of the reactor and dividing it into an aeration zone 6 and a flotation zone 7. The annular baffle is provided with windows 8 for the intake of sludge liquid, and a plate 9 is located above the baffle in the middle of the reactor vessel, in the zone aeration 6, there is a pipe 10 connected to the pipeline for supplying purified water 11, which, in turn, is connected to the inlet of the circulation pump 12, the outlet of which is connected to the irrigation circuit of the top of the reactor 13 and the distribution pipe 1 4 at the bottom of the reactor and which contains branches with nozzles At the bottom of the reactor in the flotation zone, there is a nozzle 15 for discharging purified water. Above the nozzle 15 in the flotation zone and around the perimeter of the reactor in the aeration zone, an air supply system is installed, made in the form of nozzles 16 equipped with dispersants. In the aeration zone, a nozzle 17 is fixed, made in the form of parallel bars, forming a lattice with a rigid base, on which the immobilizing material is stretched in the form of ruffs made of fiberglass or synthetic materials.

 The proposed technical solution meets the criterion of "industrial applicability", since the possibility of implementing a technical solution is confirmed by a description of its work.

 Industrial wastewater with a COD contamination of up to 20 thousand mg / l, containing in its composition ethylbenzene 0.002 - 0.003 wt.%, Styrene 0.004 - 0.005 wt.%, Methylphenylcarbinol 0.03 - 0.06 wt.%, Acetophenone 0.006 - 0.03 wt.%, Propylene glycol 0.9 - 1.05 wt.%, Phenol 0.08 - 0.1 wt.% And other impurities, enters the inlet of the circulation pump 12, intended for intensive mixing of the source wastewater and a bacterial suspension entering the pump inlet from the aeration zone 6 through the nozzle 10. The biomass partially circulates with water, partially immobilizes on the nozzle 17, in the form of parallel bars, forming a lattice with a rigid base, on which an immobilizing material is stretched in the form of ruffs of fiberglass or synthetic materials, which allows you to create a high dose of biomass in the aeration zone 6. To separate suspended biomass from purified water, the bacterial suspension enters the zone flotation 7 through windows 8, the biomass with air bubbles rises and overflows through the top of the annular partition 5 into the aeration zone 6. The plate 9 above the annular partition reflects Well, it contributes to the direction of its movement to the location of the anti-foaming system 13. The clarified water containing ethylbenzene 0.000 - 0.001 wt.%, styrene 0.000 - 0.001 wt.%, acetophenone 0.002 - 0.003 wt.%, methylphenylcarbinol 0.005 - 0.01 wt.%, propylene glycol 0.3 - 0.6 wt.%, phenol 0.006 - 0.01 wt.% from the bottom of the flotation zone 7 through a pipe 16 is discharged into the sewer. In the aeration zone 6 and flotation 7, air is forcibly supplied through a pipe with nozzles 16 equipped with dispersants. The exhaust air from the reactor 1, containing, for example, ethylbenzene 0.87 mg / l, styrene 0.40 mg / l, is fed through the pipeline for purification to bulk biofilter 4 made of natural materials. In the biofilter 4 there is a process of cleaning and deodorizing the air discharge. The purified air after biofilter 4, containing, for example, ethylbenzene 0.05 mg / l, styrene 0.01 mg / l, is released into the atmosphere.

 As can be seen from the above example, the design features of the invention allow to reduce the pollution of wastewater before dumping it into the sewer by an average of 75 - 85%, and air discharge from the reactor by 85 - 95%.

Claims (1)

 A device for biological treatment of concentrated and containing volatile organic pollutants of wastewater, including a reactor for wastewater treatment and a biofilter for treating exhaust air, a piping system for supplying and distributing wastewater, air, for draining treated water, characterized in that the reactor for treating wastewater water consists of a housing, in the center of which there is a vertical annular partition, the diameter of which is 1/5 - 1/6 of the diameter of the housing, provided at a height equal to 3/4 of the height sludge, windows for the inlet of sludge liquid, and in the center of the reactor above the partition there is a plate with a diameter equal to 1.05 - 1.1 of the diameter of the annular partition, in the middle of the reactor vessel there is a pipe connected to the pipe for supplying purified water, connected to the inlet of the circulation pump, the outlet of which connected to the irrigation circuit of the top of the reactor, made in the form of nozzles located along the perimeter of the annular partition, and with a distribution pipe located at the bottom of the reactor, made in the form of a ring, along which branches are radially arranged with branch pipes directed to one side parallel to the bottom of the reactor, at the bottom of the reactor there is a pipe in the center for the discharge of purified water, and an air supply system made in the form of pipes equipped with dispersants and located in the flotation zone above the purified water discharge pipe and along the perimeter of the reactor in the aeration zone, while a nozzle for biomass is located in the aeration zone.