JP3914582B2 - Electrode scale prevention method in electrolytic muddy water treatment equipment - Google Patents

Description

[0001]
[Industrial application fields]
In addition to cement-based muddy water, the present invention prevents electrode scales in electrolytic muddy water treatment equipment for pretreatment of filtration processes in water and sewage systems, muddy spillage due to rainfall, purification of closed water areas associated with civil engineering construction work, etc. It is about the method.
[0002]
[Prior art]
In general, as a method for purifying turbid water, it is known to add a polymer flocculant to the turbid water and aggregate and precipitate the suspended substance, and an apparatus applying this principle has been put into practical use.
[0003]
However, since this apparatus uses a large amount of medicine, there is a problem that the running cost is expensive and the influence of the medicine on the environment cannot be ignored.
[0004]
In recent years, therefore, an electrolytic muddy water treatment apparatus has been proposed as a method that does not use chemicals, in which suspended substances are aggregated and precipitated by applying electrolysis.
[0005]
[Problems to be solved by the invention]
The above electrolytic muddy water treatment device generates metal ions from the anode by applying a DC voltage to the metal anode electrode plate and cathode electrode plate. The suspended substance in muddy water usually has a negative surface charge. As a result, the neutralized particles are electrically neutralized with metal ions that are cations, and the neutralized particles attract each other by attractive force. As a result, the suspension quality in muddy water aggregates and settles. It becomes possible to clarify.
[0006]
However, if the inflowing turbid water contains many components that easily adhere to the scale, the scale gradually adheres to the surface of the electrode plate as the electrolysis progresses. Generation | occurrence | production will be inhibited and electrolytic treatment of muddy water will be reduced.
[0007]
Therefore, in the conventional electrolytic muddy water treatment apparatus, there is a problem that when electrolysis is performed over a long period of time, the scale adheres and the muddy water treatment by electrolysis is reduced.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, the present invention provides a diverging weir 5 and an overflow weir 6 in the flow path portion 1 through which muddy water passes, and an anode of a power source between the two weirs 5 and 6. By installing the electrode plate group 2 in which a plurality of sets in which one or two anode electrode plates 9a and cathode electrode plates 9b connected to the cathode 8a and the cathode 8b are alternately adjacent to each other are arranged , the electrode plate group 2 is An upward flow is generated in the passing turbid water, and an aeration device 15 is installed below the electrode plate group 2 to perform strong aeration for a short time every few hours. A voltage of 50 V or less is applied to the electrode plate group for a certain period of time. The present invention proposes a method for preventing electrode scale in an electrolytic muddy water treatment apparatus that is applied while performing polarity conversion every time and is electrolyzed at a low voltage.
[0009]
[Action]
By providing the diving weir 5 and the overflow weir 6 and causing an upward flow in the turbid water passing through the electrode plate group 2, the scale to adhere to the electrode plates 9a and 9b is forcibly washed away by this upward flow. .
[0010]
By performing short strong aeration every few hours by aeration device 15 installed in the lower portion of the electrode plate group 2, to runoff scale to be attached to the electrode plate by its upward foam flow.
[0011]
By applying a voltage to the electrode plate by converting the polarity at a constant time at a low voltage, the scale generated on both the anode and cathode electrode plates is reduced in quantity, thereby preventing the scale from being generated.
[0012]
Thereby, the scale adhering to the electrode plate can be reduced over a long period of time, and muddy water can be stably and efficiently electrolyzed.
[0013]
【Example】
The flow path portion 1 is for passing muddy water to be treated, and is formed of an insulating material. An electrode plate group 2 is disposed in the flow path portion 1.
[0014]
As shown in FIG. 3, the flow path portion 1 is configured in a box shape in which four sides are surrounded by a wall plate 3.
[0015]
On the upstream side of the flow path portion 1, muddy water is supplied by a pump P from a raw water tank 4 disposed in front of the flow path portion 1. The overflow weir 6 is provided, and the turbid water flow flows from the lower opening of the submerged weir 5 and flows upward between the two weirs 5 and 6 until it overflows from the upper end of the overflow weir 6. The electrode plate group 2 is installed between the two weirs 5 and 6.
[0016]
The electrode plate group 2 includes a plurality of sets of aluminum or iron anode electrode plates 9a and cathode electrode plates 9b connected to the anode 8a and the cathode 8b of the power source 7, respectively, alternately adjacent to each other in parallel. In this arrangement, the direction of the anode electrode plate 9a and the cathode electrode plate 9b is perpendicular to the water flow direction. It is supported.
[0017]
As shown in FIG. 1, the power source 2 is configured to vary the voltage from the commercial power source 10 by a variable resistor 11 at the next stage, and input this to a bridge rectifier 12 by a thyristor to obtain a direct current. The direct current output is connected to the anode 8a and the cathode 8b through the polarity converter 13.
[0018]
The variable resistor 11 is controlled by an output from the control device 14.
[0019]
An aeration device 15 is disposed below the electrode plate group 2, and the aeration device 15 has a hollow box shape so that air is supplied from an air compressor or a blower (not shown), A large number of air holes are formed, and air is blown out from the air holes between the anode electrode plate 9a and the cathode electrode plate 9b to be aerated.
[0020]
When the muddy water treatment is performed using the electrolytic muddy water treatment apparatus configured as described above, muddy water is sequentially supplied from the raw water tank 4 to the flow path unit 1 by the pump P, and the muddy water is submerged below the weir 5. It flows as an upward flow from the opening to the upper end of the overflow weir 6 through the electrode plate group 2.
[0021]
A low voltage of 50 volts or less is applied to the anode electrode plate 9a and the cathode electrode plate 9b while alternately converting the polarity every predetermined time by the polarity converter 13, and electrolysis of turbid water flowing in an upward flow is performed. Do.
[0022]
On the other hand, it performs a short strong aeration every few hours by aeration device 15 installed in the lower portion of the electrode plate group 2, to runoff scale to be attached to the electrode plate by its upward foam flow.
[0023]
【The invention's effect】
As described above, according to the present invention, a dive weir and an overflow weir are provided to generate an upward flow in the turbid water passing through the electrode plate group. Can be washed away.
[0024]
Since the short strong aeration every few hours by installing the aerator in the lower part of the electrode plate group, the scale to be attached to the electrode plate by its upward foam flow can be erosion.
[0025]
Since the voltage is applied to the electrode plate by converting the polarity at a constant time at a low voltage, the scale generated on both the anode and cathode electrode plates can be reduced quantitatively to prevent the generation of scale.
[0026]
Thereby, the scale adhering to the electrode plate can be reduced over a long period of time, and muddy water can be stably and efficiently electrolyzed.
[Brief description of the drawings]
FIG. 1 is a plan view showing one embodiment of the present invention.
FIG. 2 is a longitudinal side view showing one embodiment of the present invention.
FIG. 3 is a perspective view of an essential part showing one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flow path part 2 Electrode plate group 3 Wall plate 4 Raw water tank 5 Submerged weir 6 Overflow weir 7 Power source 8a Anode 8b Cathode 9a Anode electrode plate 9b Cathode electrode plate 10 Commercial power supply 11 Variable resistor 12 Bridge rectifier 13 Polarity converter 14 Control Device 15 Aeration device

Claims (3)

An electrode plate group in which a plurality of sets in which one or two anode electrode plates and cathode electrode plates respectively connected to the anode and cathode of the power source are alternately adjacent to each other is installed in the flow path portion through which muddy water passes. An electrode scale prevention method in an electrolytic muddy water treatment apparatus, characterized in that an aeration apparatus is installed below the electrode plate group and strong aeration is performed for a short time every few hours. A diverging weir and an overflow weir are provided perpendicular to the water flow direction in the flow path section through which turbid water passes, and one or two anode electrode plates and cathode electrode plates connected to the anode and cathode of the power source, respectively, between these two weirs By installing an electrode plate group in which a plurality of pairs that are alternately adjacent to each other are installed, an upward flow is generated in the turbid water passing through the electrode plate group, and an aeration device is installed below the electrode plate group. A method for preventing electrode scale in an electrolytic muddy water treatment apparatus, characterized by performing strong aeration for a short time every hour. A diverging weir and an overflow weir are provided perpendicular to the water flow direction in the flow path section through which turbid water passes, and one or two anode electrode plates and cathode electrode plates connected to the anode and cathode of the power source, respectively, between these two weirs By installing an electrode plate group in which a plurality of pairs that are alternately adjacent to each other are installed, an upward flow is generated in the turbid water passing through the electrode plate group, and an aeration device is installed below the electrode plate group. Electrolytic muddy water treatment device characterized by performing strong aeration for a short time every time and applying a voltage of 50V or less to the electrode plate group while performing polarity conversion at regular intervals to perform electrolysis at a low voltage. Electrode scale prevention method.

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