BE1023568B1 - OZONATION APPARATUS, PARTIAL OZONATION SYSTEM, AND PARTIAL OZONATION METHOD - Google Patents

Abstract

The subject of the invention is an ozonation device (2), comprising a supply pipe for water to be treated, a supply of ozonated air, characterized in that it comprises a treatment pipe (7) consisting of branches forming laces, a device for mixing water to be treated / ozonated air connected to the supply pipe for water to be treated (5) and to the supply of ozonated air (9) to inject a mixture of water to be treated / ozonated air into the treatment pipe (7), to form in the treatment pipe (7) a co-current of water to be treated and ozonated air, the laces of the treatment pipe (7) being formed in an inclined vertical plane relative to the horizontal, a degassing device (11, 12) being further arranged at elbows (8) of the treatment line (7), a device for removing residual ozonated air (15) being in additionally connected at the outlet of the treatment pipe (7) to separate the ozonated water to be treated and the residual ozonated air for the furnace At the outlet (6) of the ozonator (2), ozone treated and deozonated water. The invention also relates to a system and a method for partial ozonation using said apparatus.

Description

The invention relates to the field of water treatment, and relates more particularly to an ozonation apparatus, a partial ozonation system and an ozonation process. partial, especially for pool waters.

The process for ozonating swimming-pool water is known, which method consists in bringing the water to be treated into contact with an ozone-containing gas.

There are usually two ways of contacting the water to be treated in an ozonation reactor, either statically in a tank, or dynamically in a flow of water to be treated. In the static case, the ozonation reactor may consist of a plurality of tanks, the ozonated gas injection being carried out at the inlet of each tank. The vessel (s) may include a degassing system. In the dynamic case, ozonated gas is injected into a flow of water to be treated. In existing systems, the contact time between process water and ozonated gas is not controlled with certainty.

In addition, still in existing systems, the flow of treated water is returned directly into the pool, inducing risks of ozone in the water pool pool, which is prohibited by legislation.

There is therefore a need for an ozonation device promoting a control of contact time water to treat / ozonated air and a partial ozonation system involving pre-ozonation, for a more secure water treatment.

The present invention aims to solve the problems mentioned above, by proposing to carry out a partial pre-ozonation with recycling on a buffer tank. The pre-ozonation circuit consists of successive pipes which make it possible to precisely control the water contact time to be treated / ozonated air. The ozonized air is injected upstream of these pipes. The invention therefore firstly relates to an ozonation apparatus, comprising a water supply line to be treated, a supply of ozonated air, characterized in that it comprises a treatment line consisting of branches forming laces, a device for mixing water to be treated / ozonated air connected to the water supply line to be treated and to the ozonated air supply for injecting a mixture of water to be treated / ozonized air into the treatment pipe, to form into the treatment pipe a co-current of water to be treated and ozonized air, the laces of the treatment pipe being preferably formed in a vertical plane, inclined relative to the horizontal, a degassing device being furthermore disposed at elbows of the treatment pipe, a residual ozonated air removal device being further connected at the outlet of the treatment pipe for separating the treated water treated with ozone and the air oz residual ion to provide at the output of the ozonation apparatus ozone-treated water, désozonées.

The treatment line in laces in a vertical plane allows a management of the water flows to be treated / ozonized air on a constant surface and a length, thus an optimal control of the time of contact between water to be treated and ozonized air.

The lace treatment pipe has several branches, connected by elbows, which can be U when the different branches are vertical. The branches can also be horizontal, connected by U bends when they are parallel. In what follows, the expression "high elbow" denotes a bend of the treatment pipe located above the horizontal median plane of the treatment pipe.

In addition, the fact that the treatment pipe forms laces allows a reduced space requirement of the apparatus, while facilitating degassing at the high bends of the treatment pipe, when the treatment pipe is in a vertical plane.

It should be noted that the branches of the treatment pipe could be horizontal, without departing from the scope of the present invention.

The fact that the treatment pipe forms laces finally makes it possible to have branches in which the flow of the mixture of water to be treated / ozonized air is ascending, and branches in which the flow of the mixture of water to be treated / ozonated air is downward, which makes it possible to control the contact time as a function of the number of branches of the treatment pipe.

The fact that the residual ozonated air removal device is vertical makes it possible to ensure a final degassing therein by falling water in the residual ozonated air elimination device which is at negative relative pressure, creating thus a pressure differential with the upstream part of the treatment pipe. The height of the waterfall in the residual ozonated air elimination device is ensured by a final stick which feeds the buffer tank which is at atmospheric pressure.

Without departing from the scope of the present invention, it is understood that the treatment line may initially have a horizontal portion, especially for the mixing device.

According to a particular embodiment, the branches of the treatment pipe are vertical. The overall size of the treatment apparatus is thus reduced, and the flow of ozonized air in the treatment line to the high elbow where a degassing device is located is optimized.

According to a particular embodiment, the branches of the treatment pipe are of the same diameter. The calculation of the contact time is thus precisely known, since the water flow rate is fixed. The number of branches depends on the flow rate, the diameter and the desired contact time. A degassing device is then disposed at each of the upper bends of the treatment line.

According to a particular embodiment, the treatment pipe comprises one or more pairs of branches, the branches of a pair having the same length, the length of the branches of a pair increasing in the direction of the inlet of the pipe of treatment to the output of the treatment line.

According to a particular embodiment, the mixing device consists of a bypass line on the water supply line to be treated, ozonated air being injected via an ejector into the water to be treated s flowing in the bypass line, the ozonated water thus treated being reinjected at the outlet of the bypass line in the water supply line to be treated.

According to a particular embodiment, the mixing device is a tubular membrane diffuser at the inlet of the treatment pipe, downstream of the connection with the water supply line to be treated. The tubular diffuser may for example be an ABS (acrylonitrile butadiene styrene) diffuser with an EPDM membrane (ethylene-propylene-diene monomer). This injection will ensure a transfer of the air / ozone mixture under microbulling in the treatment line.

According to a particular embodiment, each degassing device arranged at bends of the treatment pipe is constituted by a stitch connected to an ozone destruction device with activated carbon. Advantageously, when the branches of the treatment pipe are vertical, the connections are connected gradually to the high elbows to the residual ozonated air removal device, the tapping of a high elbow being connected to the elbow puncture adjacent top. The stitching may for example be a stitching of DN 25 or DN 32 type, optionally followed by an isolation valve.

According to a particular embodiment, the device for removing residual ozonized air is constituted by an ascending column at the top of which is disposed a device for venting and tapping towards a device for destroying ozone by carbon active, and a downstream column downstream of the ascending column in which flows the ozone treated treated water to the atmosphere.

According to a particular embodiment, the ozonation apparatus further comprises, at the outlet of the residual ozonized air elimination device, a drop column comprising in the upper part a trap connected to the activated carbon destruction device.

According to a particular embodiment, the ozonation apparatus further comprises at the outlet of the residual ozonated air elimination device, or, if appropriate, at the outlet of the drop column, a bypass circuit comprising a destruction device. residual ozone by UV in ozone treated waters. The invention also relates to a partial ozonation system, characterized in that it comprises: - a water supply to be treated; - an outlet of treated water; one or more ozonation apparatus as defined above; a buffer tank comprising three compartments, a first ozone-treated water recovery compartment, a second water-treatment receiving compartment and a third level-management compartment, the first compartment having an overflow towards the second compartment; compartment, the second compartment having an overflow to the third compartment, the water supply line to be treated discharging into the second compartment, the second compartment constituting the water supply to be treated or ozonation devices, the outlet the ozonation device (s) flowing into the first compartment; and a filtration system, to which water from the first and third compartments is directed, the outlet of the filtration system corresponding to the outlet of treated water from the partial ozonation system.

The system thus makes it possible, through the overflow compartment buffer tank, a partial preozonation of the water to be treated injected from the second compartment to the ozonation apparatus.

The filtration system may include two filtration tanks. The first filtration tank comprises an inlet of ozone treated water connected to an outlet of the first compartment, and an outlet. The second filtration tank comprises an intake of a water fraction of the third compartment and an outlet. Flows from the outlets of the first filter tank and the second filter tank are mixed before treatment with chlorine. The filtration tanks may, for example, be of the type conventionally encountered in the treatment of swimming pool water.

Thus, only a portion of the water to be treated arriving in the second compartment are sent to the ozonation apparatus, the other part overflowing into the third compartment.

The portion of the water to be treated directed to the ozonation apparatus undergoes ozonation and is directed through the first compartment of the buffer tank to the filtration system. This part of the water to be treated therefore undergoes a preozonation step before filtration. The other part of the water to be treated, going over to the third compartment, is directed to the filtration system. It follows therefore a partial preozonation of the water to be treated. The invention also relates to a partial ozonation process of pool water, characterized in that it consists in continuously taking a quantity of pool water, treating said quantity of pool water by partial ozonation system as defined above, said quantity of pool water being injected into the water supply to be treated of said partial ozonation system, and to reinject the water obtained at the outlet of said partial ozonation system in the swimming pool.

Said amount of pool water may advantageously be constituted by the overflow waters of the pool.

The system and method according to the present invention thus allow a partial pre-ozonation of the pool water to be treated by an ozonation apparatus looping on the buffer tank. This buffer tank is designed to allow successive dilutions of water to be treated with treated water. The present invention thus allows a reduced consumption of ozone. In addition, because the ozonation treatment line comprises a succession of constant diameter branches and an ozonized air degassing means, the system and method according to the present invention ensure an optimally controlled contact time between water to be treated and ozonated air, and thus optimized ozonation.

To better illustrate the object of the present invention, will be described hereinafter a particular embodiment with reference to the accompanying drawing.

In this drawing: - Figure 1 is a schematic view of a partial preozonation system according to one embodiment of the invention.

In Figure 1, it can be seen that there is shown a partial ozonation system 1 according to the present invention, applied to a S overflow system of a pool P pool.

The partial ozonation system 1 comprises an ozonation apparatus, generally designated by the reference numeral 2, a buffer tank 3 and a filtration zone 4. The ozonation apparatus 2 comprises a water inlet inlet 5 to be treated and an outlet 6 for ozonated water to be treated.

Between the inlet 5 and the outlet 6 of the ozonation apparatus 2 is disposed a treatment pipe 7, having a lace-like shape, with in the embodiment shown six vertical branches, extending in the same vertical plane. interconnected by U-bends 8.

Although in the embodiment shown, the treatment line 7 has six branches, those skilled in the art will understand that the ozonation apparatus 2 may have more or less than six branches, without departing from the invention. The number of branches depends on the flow of water to be treated, the diameter of the branches, and the desired contact time between water and ozonized air.

In addition, the branches could be inclined without being vertical, without departing from the spirit of the present invention.

The water to be treated is injected at the inlet 7a of the treatment pipe 7, and ozonized air is injected into the water to be treated downstream of the inlet 7a of the treatment pipe 7, by a tubular membrane diffuser 9 , in order to create in the treatment line 7 a cocurrent of water to be treated and ozonated air. The ozonized air is created by an ozone generator 10, which may be a generator conventionally encountered commercially, for example an ozone generator manufactured by Kaufmann. Ozone is produced from the ambient air and is injected as an air / ozone mixture (also referred to herein as ozonized air). Advantageously, the ozone concentration is 20 g per 1 Nm / h of mixture. The air is first dried and then treated in order to dissociate the oxygen molecules and recombine them into ozone molecules. The production line is made by negative pressure produced by three air compressors.

At each upper bend 8 of the treatment pipe 7, there are tappings 11, followed by an isolation valve 12, each of said tappings 11 being connected to an ozone trap 13 via a pipe 14. The ozone trap 13 in the illustrated embodiment is an activated carbon ozone trap, but any other ozone trap is within the scope of the present invention. The advantage of the connections 11 at the top bends 8 of the treatment pipe 7 is to allow degassing at each of the upper bends 8, to evacuate any pockets of ozonated air injected at 9. The connections 11 are advantageously connected step by step, to the degassing column 15 described below.

In the upward branches of the process line 7, the ozonized air has, in the embodiment shown, a speed of 0.60 m / s, while in the downward branches of the process line 7, the air ozonated has, in the embodiment shown, a speed of 0.20 m / s, the waters to be treated having meanwhile a constant speed of about 0.40 m / s.

This speed control makes it possible to guarantee constant entrainment of the residual ozonized air in order to limit the formation of gaseous heads at the upper part of the branches. The water contact time to be treated / ozonized air is thus controlled.

At the outlet 7b of the treatment pipe there is a degassing column 15, vertical, the outlet of the treatment pipe 7 arriving at the bottom of the degassing column 15. The degassing column 15 constitutes the air elimination device residual ozonate. The degassing column 15 allows the separation of the injected air and ozonated water to be treated, by venting through a quill equipped with a double-acting valve, the products from degassing being directed by a pipe 14 to the ozone trap 13 by a quilting 16.

The degassing column 15 has a first upward vertical portion of greater diameter than the upstream branches of the treatment pipe 7, rising since its connection to the treatment pipe 7, and a second downward vertical portion, shorter than the first portion upward vertical, the tapping 16 being located on the junction between the two vertical parts of the degassing column 15.

The main degassing of the air / ozone mixture is done in the degassing column 15, after respect of the contact time by: - venting, the dynamic pressure of the falling water favoring the release of the microbubbles at the top of the column ; - natural climbs of air, favored by the low speed of the water; the rain water drop from the first portion of the degassing column to the second portion of the degassing column; a slight depression created by suction at the outlet of the activated carbon trap 13.

At the outlet of the degassing column 15 is provided a drop column 17, comprising an ascending branch and a descending branch, and comprising in the upper part a trap 18 connected to the ozone trap 13 by a pipe 14.

The outlet of the drop column 17 is connected to a bypass device 19, comprising a conventional conduit 20, and shunted thereon, a bypass line 21 comprising a residual ozone destroyer 22, by low pressure UV.

The outlet of the bypass device 19 corresponds to the outlet 6 of the ozonation apparatus 2.

It should be noted that the mixture of water to be treated / ozonized air could also be done before the inlet 7a of the treatment pipe, by a bypass on the feed pipe of the treatment pipe 7, via an ozone ejector, a pump then for injecting the ozonated process water into the treatment line 7, without departing from the scope of the present invention. By way of example, the first pair of branches of the treatment pipe 7, called T1, will be horizontal or vertical for a length of 7 linear meters.

The second pair of branches of the treatment pipe 7, called T2, will be U-shaped for a length of 8 linear meters.

The third pair of branches of the treatment pipe 7, called T3, will be U-shaped for a length of 9 linear meters.

The ascending branch of the degassing column 15, named T4, will be vertical and upward for a height of 10 linear meters.

The descending branch of the degassing column 15, called T4 bis, will be vertical and downward for a height of 4.5 linear meters.

The descending branch of the fall column 17, named T5, will be descending vertically for a height of 4.5 linear meters.

The ascending branch of the fall column 17, called T5 bis, will be U-shaped for a height of 7 linear meters.

Table 1 below groups the characteristics of the different elements of the ozonation apparatus 2 for different water flows to be treated.

Table 1: Characteristics of the ozonation device for different flow rates

The buffer tank 3 comprises three compartments.

A first compartment 23 in which the water treated by the ozonation apparatus 2 (ozone-treated and ozone-free) discharges, the first compartment 23 pouring into a second compartment 24 into which the water to be treated flows, by example from a swimming pool, and from which the water to be treated sent to the ozonation apparatus 2 is taken, as will be described in more detail below. The waters to be treated represent a part of the waters of the swimming pool. The second compartment 24 in turn discharges into a third compartment 25, said third compartment 25 being intended for the management of level / disconnection of make-up water, the management of the pool level and the suction towards the filtration zone 4 , also described in more detail below.

The structure of the buffer tank 3 allows the first compartment comprising the water treated by the ozonation unit 2 flowing into the second compartment in which the water to be treated from a source of water to be treated type pool from which the water to be treated, sent to the ozonation apparatus 2, is withdrawn, to send to the ozonation apparatus 2, once the system is in operation, water to be treated mixed with water treated with the ozonation apparatus 2, which reduces the amount of water treated by preozonation in the second compartment 24 of the buffer tank 3.

The filtration zone 4 comprises two filtration tanks. The number of filtration tanks can be adapted according to flow rates. The first filtration tank 27 comprises a water inlet connected to an outlet of the third compartment 25, and an outlet. The second filtration tank 26 comprises an intake of a water fraction of the first compartment 23 and an outlet. The flows from the outlets of the first filtration tank 27 and the second filtration tank 26 are mixed before treatment with chlorine. The filtration tanks 26, 27 may for example be of the type conventionally encountered in the treatment of swimming pool water.

The partial pre-ozonation system according to the present invention also comprises, not shown in FIG. 1, a float flowmeter for controlling the air / ozone flow injected into the treatment line 7, an ozone measurement probe equipping the treatment line 7 after injection, an ozone-free measurement probe fitted to the ozonation apparatus 2 at the outlet after UV treatment at 21, which probe is regularly activated by a micro-injection of ozone in order to maintain its calibration in time, a pallet flow controller equipping the ozonation apparatus 2; if there is no flow, the production of ozone is cut off. The information from the sensors is sent to a programmable digital controller.

We will now describe the flow of swimming pool water in the partial ozonation system 1 according to the present invention.

Overflow water from a pool basin is fed into the second compartment 24 of the buffer tank 3 where they are mixed with water previously treated by the ozonation apparatus 2, from the first compartment 23. A fraction said mixture is introduced by pouring into the third compartment 25. The fraction of water of overflow thus diluted out of the third compartment 25 by the outlet of the third compartment 25 at the bottom and is fed to the first filtration tank 27 of the filtration zone 4.

The second fraction of said mixture of sewage / pre-treated water leaves the second compartment 24 by the outlet of the second compartment 24 in the lower part and constitutes the water to be treated brought to the ozonation apparatus 2. The water to be treated passes either by a primary loop where ozonated air is injected before, or are injected directly to the inlet 7a of the treatment pipe 7 with ozonated air.

The water to be treated is brought into contact with the ozonated gas at the inlet 7a of the treatment pipe 7 and the two flows flow cocurrently. Ozonated air can be evacuated at each upper bend 8. All the remaining ozonized air is degassed at the top of the degassing column 15. The treated water stream free of ozonated air passes either through the destructor of residual ozone 22, either by the bypass circuit 20, leaves the ozonation apparatus 2 and is brought into the first compartment 23 of the buffer tank 3. The residual ozone destroyer 22 shown in FIG. but it can also be an activated charcoal trap. Degassing must be sufficient for the extraction of ozonated air, but the pollution of the pool water being related to the number of bathers, it is possible that ozone remains in the water at the outlet of the degassing column 15. A fraction overflows into the second compartment 24 where it mixes with the pool overflow waters. The second fraction exits the outlet of the first compartment 23 at the bottom and is fed to the second filtration tank 26 of the filtration zone 4. The flows leaving the first and second filtration tanks 26, 27 are combined and treated with chlorine before reinjection in the pool.

Claims (12)

1 - ozonation apparatus (2), comprising a water supply line to be treated, a supply of ozonated air, characterized in that it comprises a treatment line (7) consisting of branches forming laces, a mixing device for treating water / ozonized air connected to the water supply line (5) and to the ozonated air supply (9) for injecting a mixture of process water and ozonized air into the treatment line ( 7) for forming in the treatment pipe (7) a co-flow of treated water and ozonized air, the laces of the treatment pipe (7) being preferably formed in a vertical plane, inclined relative to horizontally, a degassing device (11, 12) being further arranged at elbows (8) of the treatment line (7), a residual ozonated air removal device (15) being further connected at the outlet of the treatment pipe (7) for separating treated water treated with the ozone and residual ozonized air to supply at the outlet (6) of the ozonation apparatus (2) the ozonated water treated, ozone-free. 2 - ozonation apparatus (1) according to claim 1, characterized in that the branches of the treatment pipe (7) are vertical. 3 - ozonation apparatus (2) according to one of claims 1 or 2, characterized in that the branches of the treatment pipe (7) are of the same diameter. 4 - ozonation apparatus (2) according to one of claims 1 or 2, characterized in that the treatment pipe (7) comprises one or more pairs of branches, the branches of a pair having the same length, the length of the branches of a pair increasing in the direction of the inlet (7a) of the treatment pipe (7) to the outlet (7b) of the treatment pipe (7). 5 - ozonation apparatus (2) according to one of claims 1 to 4, characterized in that the mixing device is constituted by a bypass line on the water supply line to be treated, air ozonized being injected via an ejector into the water to be treated flowing in the bypass line, the thus treated ozonated water to be returned to the outlet of the bypass line in the water supply line to be treated . 6 - ozonation apparatus (2) according to one of claims 1 to 4, characterized in that the mixing device is a tubular membrane diffuser inlet of the treatment pipe (7), downstream of the connection with the water supply line to be treated. 7 - ozonation apparatus (2) according to one of claims 1 to 6, characterized in that each degassing device (11, 12) disposed at elbows (8) of the treatment pipe (7) is constituted by a quilting (11) connected to an activated carbon ozone destruction device (13). 8 - ozonation apparatus (2) according to one of claims 1 to 7, characterized in that the device for removing residual ozonized air (15) is constituted by an ascending column at the top of which is disposed a venting device and stitching (16) to an activated carbon ozone destruction device (13), and a downcomer downstream of the ascending column in which the ozone treated water flows. put in the atmosphere. 9 - ozonation apparatus (2) according to claim 8, characterized in that it further comprises at the outlet of the residual ozonized air elimination device (15) a drop column (17) having in the upper part a trap (18) connected to the activated carbon destruction device (13). 10 - ozonation apparatus (2) according to one of claims 1 to 9, characterized in that it further comprises at the outlet of the residual ozonated air elimination device (15), or where appropriate in outlet of the drop column (17), a bypass circuit (19) comprising a device for destroying residual ozone (22) by UV in ozone-treated waters. 11 - Partial ozonation system (1), characterized in that it comprises: - a water supply to be treated; - an outlet of treated water; - one or more ozonation devices (2) according to any one of claims 1 to 10; a buffer tank (3) comprising three compartments (23, 24, 25), a first compartment (23) for the recovery of water treated with ozone, a second compartment (24) for receiving water to be treated and a third compartment (25) level management, the first compartment (23) having an overflow to the second compartment (24), the second compartment (24) having an overflow to the third compartment (25), the supply pipe in water to be treated flowing into the second compartment (24), the second compartment (24) constituting the water supply to be treated of the ozonation device (s) (2), the outlet of the ozonation device (s) (2) flowing into the first compartment (23); and a filtration system (4) to which water from the first (23) and third (24) compartments is directed, the outlet of the filtration system corresponding to the treated water outlet of the partial ozonation system. 12 - Process for partial ozonation of pool water, characterized in that it consists in continuously taking a quantity of pool water, treating said quantity of pool water by the partial ozonation system ( 1) according to claim 11, said quantity of pool water being injected into the water supply to be treated of said partial ozonation system (1) and to reinject the water obtained at the outlet of said partial ozonation system (1) in the swimming pool.