DE19910639A1 - Ozonization reactor for treating liquids, e.g. water, includes an ozone-generating electrolysis cell and an immersion pump and/or vacuum injector for recycling ozone - Google Patents

Abstract

Ozonization reactor for treating liquids, e.g. water, includes an ozone-generating electrolysis cell and an immersion pump and/or vacuum injector for recycling ozone. Ozonization reactor for integration into a liquid treatment plant as an on-line or bypass unit operating in flow-through or circulatory mode comprises: a vertical reaction vessel with a liquid inlet in the lower region and a liquid outlet and gas outlet in the upper region; an immersion-type electrolysis cell for generating ozonized air or water in the lower region of the reaction vessel; and a self-aspirating immersion pump and/or vacuum injector that draws ozone-containing gas from the upper region of the reaction vessel and injects it as fine bubbles into the upper part of the liquid column in the reaction vessel.

Description

The present invention relates to a reactor for a liquid treatment plant Ozone generation directly in aqueous, to be gassed with ozone, introduced in the reactor Liquid, why an electrolysis cell of an ozone gene to be arranged in the liquid as an immersion cell rators with external cell water supply, which serves as the ozone required for fumigation Generates ozone-oxygen gas mixture and ozone-cell water mixture, especially for the treatment of industrial water, wastewater from industry and trade areas or of process water, with a liquid inflow and outflow.

Ozone is used not only for the treatment of industrial water, e.g. B. from car washes, car Companies, printers, slaughterhouses, greenhouses and paint shops where the re-use of the filtrate should be possible, also for ozonization of liquids for Use cosmetics, but also for drinking water treatment and for the treatment of exhaust gases det. It is used for disinfecting, sterilizing, de-icing and ozonizing water and other liquids such as B. also oils.

The increasing need for drinking water can e.g. B. by increased use of surface kitchen water. Ozone can be used in addition to the conventional treatment processes Use particularly well to improve quality, because odors and flavors finally phenol and humic acids are oxidatively degraded by the ozone and iron so how manganese is oxidized to the higher oxidation levels necessary for removal the.

The water is completely decolorized and disinfected perfectly.

As a rule of thumb, you can calculate 1-5 g of ozone per m ^{3 of} water. In special cases, the exact need has to be determined by tests.

Sterile and pure water required in particular in the pharmaceutical and food industry is made with ozone. Industrial and cooling water can also be treated with ozone the. In the cooling system with cooling tower, a continuous dosage of little ozone is sufficient to prevent overgrowth with organic slime, inorganic deposits and corrosion while reducing the consumption of makeup water.

Ozone decolorizes wastewater and helps break down organic compounds. Refractory sub punches are oxidized with ozone to biodegradable products.  

In the area of the reaction or the degradation of inorganic water constituents, the Ozonation for precipitation (metal ions, e.g. iron) or for degradation (toxins, e.g. cyanide) of the fabrics.

Ozonization has a particular advantage over chemical oxidants, if the substances are bound in complex form, since ozone also splits these complexes and makes it more biodegradable.

The arrangement is essential for the introduction of the gaseous ozone into the aqueous phase reaction stage.

The construction of an ozone reactor is generally carried out in such a way that a large reaction speed and the greatest possible consumption of the ozone used. In this respect, a high ozone concentration in the gas is necessary.

Both the transfer of ozone from the gas phase to the liquid phase and the reaction with ozone is accelerated by higher ozone concentrations.

Temperature and concentration must be carefully monitored as the formation and the Decomposition of ozonides are highly exothermic processes.

This generally makes intensive cooling and monitoring of the temperature in the Reactor required. Reacti are used for the production of pharmaceuticals and fragrances ons temperatures between -80 ° C and approx. + 10 ° C are recommended for the ozone reaction.

The use of ozone for wastewater treatment immediately with the generation of Ozone in the dirty water, where the ozone is arranged as an immersion cell Electrolysis cell of an ozone generator is generated is known from DE 296 13 308 U.

The ozone generation system has an electrolysis cell designed as an immersion cell Solid electrolyte membrane, the ozone after the electrolytic process telbar on site in the water to be treated with a high output of up to 4 g / h is fathered.

It is possible to apply the contact pressure of the anode to the solid electrolyte membrane and ge gene the cathode by means of an electrode pressure plate and an acting on it from externally adjustable pressure screw and thus the parameters of the electrolysis cell le.

The electrolysis cell can be used as an immersion cell without additional encapsulation the medium to be ozonized can be operated, such media can also be ozonized which are not chemically pure water, i.e. a conductivity of greater than 20 S / cm, such as industrial and waste water and other commercial or industrial Liquids.  

It is a fully automatic, compact system for supplying the electrolytic cell with given a maximum of 1 l / h of demineralized water. This feed water supply can can be easily connected to any drinking water line.

The installation of the electrolysis cell in the wastewater to be treated is basically the case simple, with only immersion of the electrolytic cell having to be made possible. In the As a rule, existing tanks or basins can be ozonized without further modification Waste water can be used, so that no additional Tanks, additional pumps or pipes must be used.

Since the highly concentrated ozone is generated directly in the water to be treated, this results in the shortest possible route from generation to application.

This avoids losses and results in a very high entry effect degree of ozone in water. External cooling, as with conventional high-voltage Ozone generators are not necessary because the water to be treated is used directly as cooling for the Electrolysis cell works.

The arrangement of the electrolysis cell in a plant for wastewater treatment in a car wash Plants take place in a tank (stacking basin), which holds the sludge trap and the tank Zinabscheider is connected downstream. In this respect, the wastewater to be treated is already pre-prepared if it is collected in the stacking basin, there by means of the arranged there Electrolysis cell to be ozonized.

In contrast to the use of gas ozone generators with injector technology, which the ozone required for water treatment in a partial flow of the water to be treated is introduced from the outside, the ozone is introduced by means of an electrolysis cell directly in the online process in a stack bec that collects the pre-cleaned wastewater ken (z. B. 2000 liters content), with ozone directly in the water to be treated with high power is generated.

This results in the shortest possible path from the generation of the ozone to the user dung. This online method offers compared to the method of ozonization in the part electricity using external gas ozone generators have significant advantages Entry, mixing and dissolution of ozone in water.

Such online wastewater treatment plants producing ozone in the pre-treatment However, waste water is disadvantageous in that a tank to be used as a stacking basin not for the water to be collected, pre-cleaned and ozonized in the online process is always available.

Furthermore, the underground arrangement of the electrolysis cells in a tank, for. B. next to a sludge tank and gasoline separator of a car wash complex. In this respect applies it to arrange the electrolysis cell underground in a tank that is difficult to access and with the necessary power and control lines as well as the feed water supply  close, whereas these supply parts of the ozone generator are above ground the, e.g. B. directly in a room of the car wash of the gas station.

Furthermore, it cannot be prevented that the ozone cell water Mixture from the electrolysis cell this unused in the form of gas bubbles by the in the Sta pre-cleaned wastewater rises, whereby an ozone-oxygen Gas mixture is formed.

These gas bubbles flow through the liquid to be ozonized and collect in the upper part of the stacking basin as a residual ozone mixture.

This must be done by a catalyst before it is released into the atmosphere to oxygen again can be reduced, which is expensive and thereby the efficiency of ozonization tion reduced.

The separation of the ozone reactor system by the arrangement of the electrolytic cell in the lower floor stacking basins as well as the feed water supply and the control units and electricity supply supply of the electrolytic cell in an above-ground area outside the stacking basin thereby disadvantageous for service and maintenance. In particular, the connection of the electrolytic cell complex in the stacking basin, with longer high-current cables for approx. 60 A between the upper power supply to the ozone generator near the car wash and the remotely located, underground stacking basin with the immersion electrolysis cell required be, whereby in particular there are also voltage losses.

It is therefore an object to produce a liquid treatment reactor under ozone supply directly in the liquid of the reactor so that it is complete Unit directly as an ozone generation and reactor system at any point in the what circuit can be arranged directly (online) or in the bypass.

It should be possible to achieve a significant increase in the efficiency of the introduction of ozone.

Starting from a reactor for a liquid treatment plant according to the preamble of Claim 1 is to achieve this object, the design of the reactor provided according to the characterizing part of claim 1.

According to the invention, the ozonization of the pre-cleaned waste water therefore no longer takes place in a stacking basement underground, but in an easy-to-handle column-shaped reak gate container, which is directly above ground next to the cell water supply and the rest Parts of the ozone generation system can be arranged.

The electrical connection of the electrolytic cell in such a columnar or zylindörmi gene reactor vessel, as it is known from process and distillation technology via a relatively short power and control cable, including the lines to the cell water supply are short-lived.  

That flows in gas bubbles through the liquid column of the pre-cleaned wastewater Mende ozone-oxygen mixture is as a residual ozone mixture before leaving the ko Luna-shaped reaction container by means of a submersible pump or egg arranged therein nes vacuum injector system (jet pump) sucked in and again fine-bubble at the un The lower end of the reactor vessel is fed into the liquid column there, this being more can be done.

The residual ozone mixture is thus pre-cleaned with a high degree of efficiency Waste water dissolved, whereby it additionally processes this. In this respect, it creates ozone mixture, which is released into the atmosphere by a catalyst before it emerges from the reactor vessel sphere to reduce oxygen by means of a catalyst is largely avoided.

Advantageous embodiments of the invention result from the subclaims.

According to claim 2, the arrangement of the reactor vessel, the power supply and the Control of the ozone generator and the cell water supply for the immersion cell in the Reactor vessel to be arranged electrolysis cell provided in a structural unit, a ge common mounting frame is provided for these parts of the ozone generator.

The reactor vessel can have a height of 150 cm where in so far as the ozone generation and reactor system for liquid treatment alongside can be set up differently and their handling in service and maintenance is considerably simplified.

The pre is carried out by a specific system of a liquid inflow and outflow Give the maximum height of the liquid column inside the reactor vessel in one Ren area of, for example, 100 cm, with an upper area of at least 50 cm ben is in which initially residual ozone mixture collects, which is then via a Submersible pump and / or a vacuum injector system sucked in and again fine bubbles in the liquid to be cleaned by gassing with ozone is fed in.

There are according to claim 3 in the upper region of the reactor gas mixture suction Inlets with feed lines to the immersion located in the lower area of the liquid column pump or a vacuum injector system that opens there.

In this respect, it is a multiple fumigation of the liquid to be cleaned with ozone given gas, the ozone gas in the liquid by means of the electrolysis immersed there cell is generated on site.

According to claim 4, the regulation of the maximum level of the liquid column takes place and the minimally clear upper area of the reactor vessel via a check valve or via a liquid lock, with which it is possible to discharge the rivers and any ozone or ozone-oxygen gas mixture present there feed into the liquid column with fine bubbles.

According to claim 5, the arrangement of the electrolysis cell takes place near the bottom of the reactor vessel, through which the feed lines of the electrolytic cell to an external  control unit with adjustable power supply and to an ion exchanger of the cell water server supply run.

According to claim 6, the ventilation submersible pump is installed directly above the Electrolysis cell, the supply of residual ozone mixture via an immersion tube for loading ventilation submersible pump, which passes through the liquid column up to the upper area of the reactor vessel is guided.

The supply line of the vacuum injector system for additional or alternative supply residual ozone mixture to be re-fed is preferably in accordance with claim 7 se directly in the supply of the waste water, which is in the lower area of the outer wall of the reactor vessel is arranged. The injector of the liquid jet pump is in the created lower liquid inflow of the reactor vessel and with that in the upper area of the reactor vessel gas mixture suction inlet connected.

The liquid inflow or the injector arranged in it is at the lower end of the Liquid column directed directly into the area of the outlet of the immersion cell, so that the inflowing wastewater to be ozonized is immediately ozonizable.

The invention is explained in more detail below with the aid of a preferred embodiment.

The drawings show:

Fig. 1 is a schematic representation of a wastewater reactor plant with ozone generation for wastewater treatment in car washes according to the prior art, the use of an underground stacking basin for the treatment of pre-cleaned water using an on-site generated ozone;

Fig. 2 is a schematic structure of a modified reactor which column-shaped, having above ground to be mounted reactor vessel through which the pre-purified waste water is performed immediately a and in which the to be fed ozone is produced above ground by means of a submerged there electrolysis cell;

Fig. 3 is a schematic representation of the wastewater treatment in Autowaschanla gene using the reactor of FIG. 2 with a column-shaped, above-ground reactor vessel instead of a stacking basin to be used according to the prior art.

The previous use of ozone for wastewater treatment in car washes, as shown in Fig. 1, consists of process combinations of separation technology, electrolytic ozone generation and fine filtration, with decisive advantages being provided in economic and environmental terms.

Basically, any water treatment system can come with an ozonization system be binated. Furthermore, such an ozonization system can also generally flow to the river liquid treatment, for example for the ozonization of cosmetics.

Processing the reusable portion of dirty wash water Car wash takes place as follows:

The wash water is freed of removable substances and lighter liquids (oil and petrol) by a sludge trap 22 , a petrol and coalescence separator 23 according to the DIN standard 1999.

The water purified in this way then passes into the 2,000 liter stacking pool 24 , in which the ozonator cell, which can be introduced directly as a diving cell into the water to be clarified further, is connected to direct ozone generation on site in the form of an electrolysis cell 5 .

The ozone is treated directly in the electrolytic process the water with an output of e.g. B. 4 g / h generated according to DE 296 13 308.6 U.

This results in the shortest possible path from the generation of the ozone to the user dung. Compared to the ionization method in the partial flow, this online process offers who practiced using external gas ozone generators with injector technology becomes, considerable advantages with regard to the entry, mixing and dissolution of ozone in water.

The immersed electrolysis cell for generating ozone is connected to an external control device 25 with a controllable power supply 8 and to an ion exchanger 9 for supplying 0.4 l / h of completely deionized water. Operating gases and cooling systems are not required for this type of ozone generation.

In the process, an ozone-containing partial stream is conducted back from the stacking basin 24 into the sludge trap 22 . Through this cycle, the ozone prevents the growth of anaerobic bacteria, which are responsible for the unpleasant smell of the waste water.

In addition, the excessive formation of aerobic bacteria, which affects the filterability of the Impair water, restricted.

According to the process for cleaning industrial water according to DE 296 13 308.6, it is there at known, the electrolysis cell in the only pre-cleaned wastewater, which the Sta inflows, arranges and operates. To make this possible, the Diving cell on a fully automatic, compact system for supplying the cell with ma x 1 l / h demineralized water, which is freed from electrically conductive salt, be connected.

Due to this separate cell water supply, the electrolysis cell can be directly in the industrial process water for ozone generation and ozonize it, whereby ozone is generated in an electrolytically high concentration.

In this respect, it is a treatment of industrial water in car factories, printing plants, slaughterhouses greenhouses and paint shops where the Filtra can be used again tes should be possible.

Not only is the amount of wastewater drastically reduced, but also a cycle of Recycling water enables.

According to FIG. 2, instead of an underground stacking basin and according to FIG. 1 thereof, ozone generation systems to be arranged above ground, an ozone generation and reactor system using an above-ground arrangement, online and / or in the bypass in the flow or alternatively in the circulatory operation in the liquid treatment system can be integrated columnar reactor vessel 12 .

In this respect, there is a summary of the ozone generation and reactor system for clarification of the wastewater.

In particular, service and maintenance of the system are simplified, with the system Longer high-current cable for connecting the electrolytic cell in an underground stack basin is dispensed with.

FIG. 2 is here, for instead of one. B. 2000 liter and underground directly next to the sludge trap and gasoline separator stacking basin 24 only a conventional column-shaped reactor tank 12 , which can be set up freely in the above-ground area of the petrol station, which in this respect can be installed directly next to the cell water supply and power supply and the electronic control of the electrolysis cell .

The reactor vessel 12 has a cylindrical, elongated shape, that is, a column shape, as is known from chemical process engineering and distillation technology.

This reactor vessel 12 has in its interior a liquid column of, for example, 100 cm height, which extends approximately above ¾ the container height between a lower liquid inflow 2 and an upper wastewater outlet 4 .

Above the liquid level of the liquid present in this lower area 13 of the reactor vessel 12 , there is an upper area 14 in the reactor vessel. In this part, gas bubbles of the ozone-oxygen gas mixture generated by the electrolytic cell collect, which flow through the liquid column and form a residual ozone mixture above half the liquid level in the upper region 14 of the reactor vessel.

Instead of reducing this mixture to oxygen again by means of a catalyst before it is released into the atmosphere, as can be seen in FIG. 2, the residual ozone is sucked in before the outlet from the reactor vessel 12 via the arrangement of a submersible pump 6 and a vacuum injector system 3 and again fed in fine bubbles in the lower region of the reactor vessel 12 .

The supply of the residual ozone mixture from the upper region 14 of the reactor vessel 12 takes place via a feed pipe 17 designed as a dip tube, which extends from a suction inlet 15 to the liquid level of the liquid column through it to the ventilation submersible pump 6 .

In order to achieve the highest possible efficiency of the ozone admixture, the vacuum injector system 3 is used in addition to the ventilation submersible pump 6 , which is richly laid out in a liquid inflow 2 for the only pre-cleaned waste water in the lower tank area.

The vacuum injector system operates in the form of a liquid jet vacuum pump, the injector first feeding residual ozone mixture into the pre-cleaned wastewater and this wastewater-ozone mixture then being fed directly into the area of the outlet 21 of the electrolytic cell 5 .

It is a reactor for liquid treatment with ozone generation given directly in this liquid to be ozonized, with the reactor at any Can be placed directly online or in the bypass in the water circulation system and there is a significant increase in the efficiency of the addition of ozone.

The reactor vessel 12 can be manufactured from ozone-resistant materials, that is from hard PVC, Te flon, aluminum, stainless steel or glass.

The wastewater treatment plant for car washes shown in Fig. 3 enables z. B. instead of 100 liters of fresh water, only about 10% of it is needed per car. The remaining 90% are generated by the method modified according to FIG. 2 and described above in relation to FIG. 1.

Reference list

1

Reactor plant

2nd

Liquid inflow (waste water inlet)

3rd

Vacuum injector system

4th

Liquid runoff (ozonized pre-treated wastewater)

5

Electrolytic cell

6

Submersible ventilation pump

7

Exhaust outlet

8th

Power supply / control of the ozone system

9

Ion exchanger for cell water supply

10th

Drain valve

11

Mains water connection

12th

columnar reactor vessel

13

lower area in this

14

upper area in this

15

,

16

Intake inlets

17th

,

18th

Leads to (

3rd

) respectively. (

6

)

19th

Outer wall of the reactor vessel

20th

ground

21

Electrolysis cell outlet

22

Sludge trap

23

Gasoline separator

24th

Stacking basin

25th

Control unit for the electrolysis cell and the ozone generator

26

Supply

27

Supply

Claims (10)

1. Reactor ( 1 ) for a liquid treatment plant with ozone generation directly in to be gassed with ozone, aqueous liquid introduced into the reactor, for which purpose an electrolysis cell ( 5 ) to be arranged in the liquid as an immersion cell ( 5 ) of an ozone generator with an external cell water supply ( 9 ), which generates the ozone required for fumigation as an ozone-oxygen gas mixture and ozone-cell water mixture, in particular for the treatment of industrial water, wastewater from industrial and commercial areas or process water, with a liquid inflow ( 2 ) and outflow ( 4 ), thereby characterized in that
the reactor ( 4 ) has a column-shaped reactor container ( 12 ) which can be integrated “online” and / or “in the bypass” in the flow-through mode or alternatively in the cycle mode in the liquid treatment system,
that a lower area ( 13 ) for receiving a liquid column from the liquid to be sent and for receiving the electrolytic cell ( 5 ) to be introduced as an immersion cell in this liquid column is provided in it,
and an area ( 14 ) above it for collecting an ozone-oxygen gas mixture or ozone generated in the electrolysis cell ( 5 ), which escapes from an ozone-cell water mixture,
that this residual ozone-oxygen gas mixture before it emerges from the reactor ( 1 ) from the upper region ( 14 ) of the reactor vessel ( 12 ) above the liquid column by means of a self-priming submersible ventilation pump ( 6 ) arranged in the liquid column and / or an outlet there Vacuum injector system ( 3 ) can be sucked in and fed in again in the lower part of the liquid column with fine bubbles. 2. Reactor according to claim 1, characterized in that the reactor vessel ( 12 ), the power supply ( 8 ) and the control of the ozone generator and / or the cell water supply ( 9 ) for the electrolysis cell ( 5 ) in a structural unit ( 1 ) are combined on a common mounting frame. 3. Reactor according to claim 1 or 2, characterized in that in the upper region ( 14 ) of the reactor vessel ( 12 ) gas mixture suction inlets ( 15 , 16 ) for pending ozone-oxygen gas mixture with thereof to the ventilation submersible pump ( 6 ) and / or the vacuum injector system ( 3 ) leading supply lines ( 17 , 18 ) are placed above the liquid level of the liquid column such that the introduced ozone and / or ozone-oxygen gas mixture is sucked in again after flowing through the liquid column and flows through the liquid column of the liquid to be gassed several times. 4. Reactor according to claim 1, 2 or 3, characterized in that to regulate the maximum level of the liquid column and above this liquid speed minimally to be released upper area ( 14 ) of the reactor vessel ( 12 ) in the outer wall ( 19 ) of the liquid drain ( 4 ) is created with a shut-off valve or a liquid lock for retaining ozone or the ozone-oxygen gas mixture. 5. Reactor according to claim 1, 2, 3 or 4, characterized in that the electrolysis cell ( 5 ), which is designed as an immersion cell, is arranged at the lower end of the liquid column in the vicinity of the bottom ( 20 ) of the reactor vessel ( 12 ) and leads ( 26 , 27 ) to their external power supply ( 8 ) and an ion exchanger ( 9 ) there for the cell water supply. 6. Reactor according to one of claims 2-5, characterized in that the submersible ventilation pump ( 6 ) is arranged at the lower end of the liquid column above the electrolysis cell ( 5 ) designed as a immersion cell and its gas mixture suction inlet ( 15 ) in the upper one Area ( 14 ) of the reactor vessel is placed at the upper end of an immersion tube ( 17 ) protruding from the liquid column and through it to the ventilation submersible pump. 7. Reactor according to one of claims 1-6, characterized in that the vacuum injector system ( 3 ) is applied as a liquid jet vacuum pump with its injector in a lower liquid inflow ( 2 ) of the reactor vessel ( 12 ) and with it in the upper Area ( 14 ) of the reactor vessel ( 12 ) gas mixture suction inlet ( 16 ) is connected via a feed line ( 18 ) to the injector ( 3 ). 8. Reactor according to claim 7, characterized in that the liquid inflow ( 2 ) at the lower end of the liquid column to the side of the outlet ( 21 ) of the electrolytic cell ( 5 ) designed as an immersion cell. 9. Reactor according to one of claims 1-8, characterized in that the reactor vessel ( 12 ) has a height of 150 cm and the liquid column forming in it has a maximum height of 100 cm, the upper region ( 14 ) of the Reactor container ( 12 ) gives a minimum height of 50 cm. 10. reactor vessel ( 12 ) according to any one of the preceding claims 1-9.