FR2631020A1 - Electrophoretic electrolytic purification station - Google Patents

Abstract

Device for electrolysis treatment of aqueous effluents contaminated with miscible products. Process making it possible to treat contaminated aqueous effluents while avoiding the use of any chemical reactant. The invention consists of a vessel 1 which has an effluent entry orifice 7 in its upper part, a discharge orifice 6 in its lower part, and a sonic or ultrasonic transmitter 4. A set of electrodes will be arranged vertically inside the tank: anodes 3 N/2 cathodes 2 N/4 or cathodes 2'' N/4 depending on the chosen method of treatment. In the case where alumina ions are obtained by electrolysis of an electrolysis tank and of a metering pump. In the case where alumina ions are obtained using an alumina sulphate solution from a tank and a metering pump. The device according to the invention is particularly intended for the treatment of industrial aqueous effluents.

Description

If ELECTROLYTIC PURIFICATION ATION
TREATMENT OF POLLUTED AQUEOUS EFFLUENTS
Effluent produced by the operation of a production machine in industry, from which we want to extract the miscible components.

- Emulsified oils - - non-stick product between the cast metal and the mold
called: foundry pottery
- rectification liquid
- wash water
The Treatment Method is a secondary phenomenon in electrophoresis, linked to a sound or ultrasound emitter.

 The process consists of the electrolysis of water, a release of oxygen at the anode, and of hydrogen at the cathode.

Description of the bath
The bath will include an even number of electrodes, for example 20 distributed as follows, in the chosen case - Anodes made of N or IO soft iron plates
2 - Cathodes 1st case: made up of N or IO # iron-plates
soft 2 - Cathodes 2nd case: made of N or 5 iron plates
soft and N be-45 aluminum plates.

4
The number of electrodes is not limiting, it can be increased or decreased, depending on the case, depending on the effluents to be treated.

 All of these electrodes are placed in a plastic or stainless steel tank with insulating parts. They will be arranged so as to create a forced circuit, in which the effluent will circulate to be treated.

 At the bottom of the tank, and under the electrodes, a sound or ultrasound generator will be installed.

Description of operation:
After the plates are energized by a low-voltage rectified current, for example I2 V and high intensity, but whose characteristics are such that they do not cause the decomposition of water, particles in suspension, or in solution in the effluent, will go to the anode; their deposition will be hampered by the release of oxygen and, by the sounds or ultrasound which are emitted in the bath.

 The release of oxygen risks making this deposit spongy, without taking into account the influence that the oxygen absorbed can have on the chemical qualities of the material containing the deposit, the sounds or the ultrasound will prevent the solidification of this deposit.

 Furthermore, the formation of the electrophoretic deposit may not result directly from the discharge of the particles at the anode, but from the precipitation of the particles by the ions emitted by the anode which will destabilize the chemical equilibrium by a supply of ferric ions. positive, thus neutralizing the electric charge carried by these particles, cause the latter to coagulate.

In the electrolysis bath, an addition of alumina ions will facilitate the coagulation of the particles and the formation of the precipitate. These alumina ions will be provided in the following manner
I) - By metal cathodes based on aluminuim
arranged inside the bath.

2) - By alumina sulfate diluted in water and intro
must in the bath by a metering pump in one place
of the circuit created by the plates.

30) - By an electrolytic solution introduced into the bath
by a metering pump; the alumina ions in this
solution will be obtained by the decomposition of
aluminum plates in a separate electrolysis bath.

 The sounds or ultrasound installed under the plates, will produce strong vibrations and large variations in pressure in the bath, which will have the effect of dissociating and causing the particles to burst and allow better circulation of the electric current, and therefore facilitate and speed up the neutralization and precipitation process.

 The sounds or ultrasounds emitted in this bath will prevent the formation of flocs, and will avoid the solidification of these which would risk forming a mud, but will maintain a precipitate formed in suspension, which will facilitate its evacuation in the tloculation tank. .

 A coagulation and flocculation agent such as a polymer with an ionic, anionic, nonionic or cationic charge, depending on the nature of the effluent, is introduced into this tank, which will have the effect of transforming the precipitated particles into flocs, and to accelerate the separation of water from the flocs forming a mud.

 The effluent will pass through a static separator.

 The sludge will be pumped in the lower and upper part, depending on its nature, a cycle will be determined during the setting of the installation, depending on the quantities of sludge.

 The sludge thus recovered will be dewatered in a filter press or on a paper press filter, or on a sand filter.

 By way of illustration, the attached drawings which represent - fig I A sectional bath, according to the 1st case described.

- fig 2 A sectional bath, according to the 2nd case described.

- fig 3 A bath in top view, according to the 3rd case
described, and the tank used for the supply of ions
alumina, based on alumina sulfate.

- fig 4 A bath in top view to see the
flow path of the effluent and the bath
electrolytic for the supply of alumina.

 With reference to these drawings, the treatment unit is made up - fig n0 I, of a tank I whose dimensions are variable, according to the quantity of effluent to be treated per day, or hour.

 Of an even number in total, in this case of IO soft iron electrodes, called anode 3.

 Of an even number in total in this case of f # igure of IO soft iron electrodes, called cathode 2.

 A sound or ultrasound transmitter 4.

 From a space 5 of 3 to 10 mm between the top of the transmitter 4 and the lower part of the electrodes 2 -3.

 An orifice 7 in the upper part to allow the arrival of the polluted effluent.

 An orifice 6 in the upper part, to allow the flow of the treated effluent.

 In the embodiment according to figure n0 2 of an even number of electrodes in total in this case of figure IO soft iron electrodes called anode 3, of 5 electrodes called cathode 2 in soft iron at the start of the hydraulic circuit of 5 electrodes called 2 "aluminum anode at the end of the hydraulic circuit.

 In the embodiment, according to Figure No. 3 according to the description of Figure No. I, a metering pump IO will inject a solution containing alumina sulfate prepared in advance in a tank II.

 In the embodiment according to FIG. 4, according to the description of FIG. I, a metering pump IO will inject a solution containing alumina ions, obtained by electrolysis in an independent tank I2.

 The device according to the invention is particularly intended for the treatment of effluents in the metal processing industry.

Claims (3)

CLAIMS 1.0) - Process for the treatment of polluted aqueous effluents by miscible components, characterized by the combination of the following steps, electrolysis of the tributary supply of ferric ions and alumina ions, wave emissions sound, intended to burst the polluting parts to allow their neutralization, and to maintain these coagulated parts, in the form of a very fine precipitate. 20) - the electrodes called cathodes and anodes will be  metal and distributed as follows: 3 N anode  cathode 2 N cathode 2 N 2  4 4  The 2 "cathodes will be placed at the end of the  effluent circuit.  They will have to release alumina ions, alumina  serving as a coagulant.  The cathodes 2 at the start of the circuit will release them,  ferric ions used for the destabilization of  chemical balance, by supplying positive ions. 30) - method according to claim I characterized in that  that the contribution of alumina ions is obtained by the electr  lysis in the bath. 40) - method according to claim I characterized in that  1 t contribution of alumina ions is obtained by electro  separate lysis. case of fig. NO 4 50) - method according to claim I characterized in that  the contribution of alumina ions is obtained by dilution  alumina sulfate, case of fig. NO 3 60) - Processing unit for implementing the process  according to any one of claims I 2 3 4 5  characterized in that it consists of a tank I  in the upper part, an effluent inlet orifice  6, an effluent outlet orifice 7 arranged vertically  a number of electrodes distributed as follows  - anodes 3 in iron N, cathodes 2 in iron N at the start 2circuft w  and at the end of the hydraulic, according to the 1st  case represented by figure NO I Claims  where iron 2 cathodes N at the start of the hydraulic circuit  w  2 "aluminum N cathodes at the end of the hydraulic circuit  w  that, according to the 2nd case, 4 represented by the figure NO 2  arranged with a space 5 of between 3 and 10 mm at  above a transmitter 4 of sounds or ultrasound under any  the surface or substantially.  70) -Processing unit according to claim 6, characterized  in that the supply of alumina ions in the bath is  will be between anode and cathode, at a point N of the circuit  hydraulic in the event that the supply of alumina ions  is external, the supply duct I3 is arranged  at the start of the last hydraulic section N between  cathode and anode. Figure 4 and 3 w 8) - Processing unit according to claim 6, the contribution  alumina ions from an electrolysis bath or  of an alumina sulfate solution, this contribution will be made  using a metering pump, according to figure 4 and 3