KR100639114B1 - Electrodewatering device for sludge - Google Patents

Abstract

The present invention relates to an electric dewatering apparatus for dewatering sludge which is a by-product of steel. The present invention relates to an electric dehydration apparatus configured to supply sludge to a filter plate installed on a dehydrator supporter and to compress and apply a DC voltage. The present invention provides a sludge dewatering device including a + .- electric injection line electrically connected to a negative electrode plate and a positive electrode plate mounted therein and connected to a direct current generator and a wire.

The present invention prevents the operation interruption by breaking the wire during the dehydration operation, it is easy to install and maintain the dehydration device to ensure the stability of the operation as well as to contribute to the productivity.

Electrodehydration, Electrophoresis, Electroosmosis, Pretreatment, Filter Plate

Description

Sludge Dewatering Device {ELECTRODEWATERING DEVICE FOR SLUDGE}

1 is an exemplary view showing a detailed configuration of the electric dewatering device and the filter plate according to the prior art,

2 is a configuration diagram of the electric dehydration apparatus according to the present invention,

3 is a plan view of FIG.

4 to 5 is an exemplary view of the filter plate of the electric dewatering device according to the present invention.

♧ description of the symbols for the main parts of the drawing ♧

100 ... Dehydrator Support 110 ...

120 .... Pressure cylinder 130 .... Filter

131 .... filtration plate 132.Sludge inflow hole

133 .... cathode plate 134 .... anode plate

135 ....

137 .... Filtration drain 138 ....

139 .... rubber 140a, b .... electric injection line

150 .... Wire 160 .... DC Generator

The present invention relates to an electric dewatering device, and more particularly, to improve the dewatering efficiency by applying an appropriate pretreatment and electric strength and dehydration pressure by using an electric dehydrator sludge generated in an industrial facility to efficiently incinerate or landfill sludge It relates to a sludge electric dewatering device for recycling.

Sludge, which is an industrial by-product of 12% of the total amount of domestic waste generated, generated about 5.9 million tons of organic and about 2.2 million tons of inorganic during 1999. The sludge treatment cost is between 240 billion and 400 billion won.

Such sludge wastes are difficult to landfill and incinerate, unlike general wastes, which are also due to the harmful substances contained in the sludge, but more importantly, due to moisture, a large amount of strong alkaline leachate, which is a harmful component, is generated when the sludge is too moist. In addition, incineration costs are additional.

Therefore, economical and high-efficiency sludge dewatering technology is not only required for all sludge-generating worksites, but also the cost reduction of sludge waste disposal and the dehydrator and dewatering equipment manufacturing and sludge of our public and private sludge treatment disposal sites. It is a basic technology for sludge recycling companies that manufacture fertilizers, feed, building materials, and soil improvement materials.

However, the method currently applied to sludge dewatering has a disadvantage of low efficiency and high energy consumption because the sludge is dewatered by mechanical force in a filter press, belt press, vacuum filter, or the like.

That is, as shown in Figure 1, the dehydrator support 10 is provided, the filter plate moving table 11 is disposed therein, the outside of one side of the dehydrator support (10) the filter plate moving table 11 is pressurized A pressurized cylinder 12 is installed, and the filter plate moving table 11 is equipped with a plurality of filter plates 13, each of which is connected to a DC generator 14 through an electric wire 15.

At this time, the filter plate 13 is a 'c' shaped support (13a), the +,-electrode plate (13b) mounted on the inner surface and connected to the DC generator 14 by the wire 15, respectively, Each of the electrode plates 13b and the wires 15 is connected to the internal connection line 15a and the connecting pin 15b for the electrical connection. Is connected by.

By the way, the conventional electric dewatering device having such a configuration has a very complicated and inconvenient installation structure, as well as the wires 15 corresponding to the number of each filter plate 13, as well as to wire them, causing further disconnection during operation There was a disadvantage that dehydration could not be performed properly.

The present invention has been made in view of the above-described problems of the prior art, and has been created to solve this problem, and has a high dewatering efficiency of sludge generated as an industrial by-product by using an electric dehydration method by electrophoresis or electroosmotic. The purpose of the present invention is to provide a sludge electric dewatering device that can simplify the connection between the filter plate and the electric wire in the electric dewatering device to secure work stability and facilitate installation and maintenance.

In order to achieve the above technical problem, the present invention provides an electric dewatering device configured to supply and compress sludge to a filter plate installed on a dehydrator supporter and to apply a DC voltage at the same time, through which the filter plate is mounted. It is characterized by providing a sludge electric dewatering device including a + .- electric injection line electrically connected to a negative electrode plate and a positive electrode plate and connected to a direct current generator and a wire.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Prior to the description of the drawings, explaining the basic principle of the electric dehydration method, when the electric field is applied to the sludge, the particulate matter and water contained in the sludge is solid-liquid separated by the movement, which appears to be electrophoretic and electroosmotic. Electrophoresis means that the charged particulate component in the direct current electric field moves toward the electrode plate. Since most of the particulate matter has a negative charge, they move toward the anode plate due to electrical movement, so that dehydration time has elapsed. Therefore, the dehydration efficiency by this part is increased, and electro-osmosis is a term for the mobility of water in an electric field, and once a certain water is removed by pressing, sludge cake is formed. The moisture remaining in the sludge cake is transferred to the electrode plate of opposite polarity in the sludge particle layer. 10,20) will start to move to each side is to promote dehydration is to increase the dehydration efficiency.

In addition, heat generation occurs due to the movement of moisture and particles in the electric field, which is called coulombic heating.

As a result, the electrodehydration method is a solid-liquid separation of particles and liquids by the electrophoretic and coulomb heat acting concomitantly with capillary pressure and electroosmotic phenomena. Optimizing the electric field application time can maximize the efficiency of electric dehydration.

Figure 2 is a schematic view of the electric dewatering device according to the present invention, Figure 3 is a plan view of Figure 2, Figures 4 to 5 is an exemplary view of the filter plate of the electric dewatering device according to the present invention.

2 and 3 of the present invention using the above-described principle, the dehydrator support 100 is provided, the filter plate moving unit 110 is disposed therein, one side of the dehydrator support 100 The pressure cylinder 120 for pressurizing the filter plate moving table 110 is installed on the outside, and the filter plate moving table 110 is equipped with a plurality of filter plates 130, and the electric injection line is connected to each other and connected through them. 140a and b are disposed, and wires 150 are respectively connected to the DC generator 160 to the electric injection lines 140a and b.

At this time, the filter plate moving unit 110, the pressurized cylinder 120, the wire 150 and the DC generator 160, including the dehydrator support 100 is provided with the same configuration as before.

On the other hand, the electric injection lines 140a and b are newly constructed, and two wires of + and − are respectively arranged to be routed through the filter plate 130, and the wires 150 are each of the electric injection lines 140a and b) is connected to the + and-poles of the DC generator 160 so that a voltage can be applied.

In particular, the electric injection line 140a, b may be made of an alloy through any one or a combination of two or more selected from copper, tungsten, iron, stainless steel, titanium, and further, one wire (one strand) or two wires (two Strands) and the like.

That is, the present invention is provided with one electric injection line (140a, b) integrally to the filter plate moving table 110, so as to correspond to each filter plate 130, as in the conventional DC generator 160 and the wire 150 ), There is no need to connect them individually, which leads to a very simple structure.

The filter plate 130 is divided into two plates having inner surfaces of symmetrical shapes, as shown in FIGS. 4 to 5, and when the two plates are assembled, the filter plate member 131 and the filter plate member ( The negative electrode plate 133 and the positive electrode plate 134 separated from each other and fixed to the inner surface of the 131, and the support 135 and the filter cloth 136 attached to the inner surface of the filter plate member 131 is configured.

A sludge inlet hole 132 is formed in the center of the filter plate member 131, and a negative plate 133 having a substantially rectangular plate is mounted on an inner surface of the filter plate member 131 around the sludge inlet hole 132.

The negative electrode plate 133 is connected to the electric injection line 140b by an internal connection line and a connection pin in the manner described in the related art.

In addition, the positive electrode plate 134 is mounted on the inner wall surface of the filter plate member 131 at a distance from the negative electrode plate 133, and the positive electrode plate 134 has a substantially rectangular band (border) shape.

The positive electrode plate 134 is also connected to the electric injection line 140a in a manner similar to that of the negative electrode plate 133 described above to be supplied with power.

On the other hand, the inner wall surface of the filter plate member 131 is mounted with a rectangular filter cloth 136 covering the space between the negative electrode plate 133 and the positive electrode plate 134, the sludge inlet in the center of the filter cloth 136 Ball 132 is formed through, the support frame 135 is installed at intervals at the edge.

Therefore, the supporter 135 is installed on the four sides of the filter cloth 136 with a space, that is, the space 138 interposed therebetween, wherein the rubber for sealing is provided between the space 138 and the supporter 135. 139).

The rubber 139 is to prevent the water generated during sludge dewatering to be moved toward the positive electrode plate 134.

Here, the space portion 138 is formed so that its width at least corresponds to the width of the positive electrode plate 134 so that the positive electrode plate 134 is exposed, preferably protrudes.

Further, the surface of the support 135 is formed by waterproof coating, the flow path is formed therein, the flow path is connected to the filtered water discharge hole 137 formed near each corner.

Therefore, the water generated during dehydration can be discharged through the filtered water discharge hole (137).

Although not shown, each lower surface of the filter plate member 131 is provided with a caster (not shown), and the caster is compressed so that the caster is moved along the bottom surface of the dehydrator support 100 shown in FIG. 2. The flow of 130 may be maintained smoothly.

In particular, it is more preferable that the electrical injection lines 140a and b are formed only with the central portion of the conductive metal and are treated with a plastic material to be wrapped in a plastic material to greatly reduce the risk of a safety accident.

The operating relationship of the present invention made of such a configuration is as follows.

Sludge, which is a by-product of the collected steel, is chemically treated through a pretreatment process and is kept to a certain size and coagulated, ie, colloidal state.

The sludge in this state is pumped and charged into the inner space where the filter plate members 131 are contact-fixed through the sludge inlet hole 132 of the filter plate member 131.

The charging process is until the sludge charged through one side of the filter plate 131 is completely filled in a plurality of chambers and is no longer flowed at the final stage. If the sludge is continuously pressurized in this state, the sludge is compressed as much as possible. do.

Subsequently, when a DC voltage is applied to the negative electrode plate 133 and the positive electrode plate 134, the sludge particles move to the positive electrode in the early stage, but dehydration occurs by the electroosmotic action in the second half.

At this time, the high-efficiency electric dehydration is overwhelmingly dominated by the electroosmotic phenomenon occurring in the second half, so that more dehydration of the negative electrode plate 133 occurs.

Therefore, in the present invention, the size of the negative electrode plate 133 is significantly larger than that of the positive electrode plate 134.

In addition, the size of the positive electrode plate 134 and the negative electrode plate 133 may be changed according to the type of sludge.

Example 1

In order to confirm the efficiency of the present invention, the dehydration efficiency was compared through a filter press equipped with a filter plate of 47 cm.

Dehydration conditions were compared by measuring the moisture content of sludge generated after dehydration for 30 minutes at dehydration pressure of 5 atm.

In order to remove the deviation in case, 10 samples were prepared and each of them was tested under the same conditions to calculate the average value.

At this time, the supply voltage was carried out for 100 minutes, 15 minutes, was performed under the same conditions in the case of not supplying the voltage for comparison, the results are shown in Table 1 below.

Item Steel sludge Water content when dehydrating without electricity (%) 96.2 to 98.5 Water content rate (%) at the time of electric dehydration by the conventional apparatus 56.6 ~ 65 ~ 7 Electric dehydration rate by the device of the present invention (%) 48.5 ~ 62.6

As shown in Table 1, the dehydration efficiency was very low in the case of non-electrical dehydration, and in the case of electric dehydration using a conventional apparatus, the dehydration efficiency was higher than that in the non-electrical dehydration.

However, in the case of electric dehydration using the apparatus of the present invention, the dehydration efficiency was remarkable.

As described in detail above, the present invention prevents the operation interruption caused by disconnection of the wires during the dehydration operation, facilitates the installation and maintenance of the dehydration device, and improves the efficiency even if the number of filter plates is cut in half. It is possible to reduce the size of the operation and to ensure the stability of the operation provides a great effect of improving productivity.

Claims (5)

delete Filter plate installed on the dehydrator support, the negative electrode plate and the positive electrode plate mounted therein through the filter plate and electrically connected with a direct current generator and a wire, +,-including an electric injection line, and supplied sludge to the filter plate In the electric dehydration apparatus configured to apply a DC voltage at the same time; The filter plate comprises a filter plate member through which a sludge inlet hole is formed at a center thereof and two plates divided therein are assembled to form a predetermined size space therein; A square plate-shaped negative electrode plate mounted on the inner wall surface of the filter plate material with the sludge inlet hole as the center; A rectangular band-shaped positive electrode plate mounted on an inner wall surface of the filter plate material at a predetermined interval from four sides of the negative electrode plate; A filter cloth attached to a central portion of an inner wall surface of the filter plate material including a cathode plate so that a sludge inlet hole is formed in the center and covers the space between the anode plate and the cathode plate; And a supporter attached to the inner wall surface of the filter plate member and having a plurality of filtered water discharge holes while forming a space portion at intervals from four sides of the filter cloth. The method according to claim 2, The sludge electric dewatering device, characterized in that the sealing rubber is interposed between the support and the space. The method according to claim 2, The support is sludge electric dewatering device, characterized in that the surface is waterproof coating. The method according to claim 2, The filter plate material is sludge electric dewatering device, characterized in that the caster is attached to the bottom surface.

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