KR100718036B1 - Sludge treatment apparatus - Google Patents

Abstract

The present invention relates to a sludge treatment apparatus. The sludge treatment apparatus according to the present invention is for sludge cake dewatering from sludge separated from wastewater, and includes a sludge conveying pipe, a water tank for supplying water to the conveying pipe, and a water tank for controlling the amount of water supplied to the conveying pipe A flocculating agent tank for supplying the sludge flocculating agent to the transfer piping, a flocculating agent adjusting valve installed on the transfer piping for adjusting the flocculating agent amount, water and an aggregating agent together, An agitating tank for supplying the agitating liquid to the transfer pipe after the agitating tank is formed, an agitating liquid adjusting valve for adjusting the amount of the agitating liquid supplied to the transfer piping, A first impeller installed in the stirring tank, a second impeller installed in the conveying pipe, a preheater of the sludge cake A first transfer pump, a second transfer pump, and a quantity control valve, a flocculant control valve, a first transfer pump, a second transfer pump, a first impeller, a second impeller, , A flocculation liquid control valve, and a controller for controlling the operation of the charge amount measurement sensor.

Sludge, sludge cake, coagulant

Description

[0001] Sludge treatment apparatus [0002]

1 is a schematic block diagram for explaining a conventional sludge disposal apparatus.

2 is a schematic block diagram of a sludge treatment apparatus according to a preferred embodiment of the present invention.

Description of the Related Art

100 ... sludge treatment device 10 ... transfer piping

20 ... water tank 30 ... coagulant tank

40 ... Stirring tank 45 ... First impeller

50 ... second impeller 60 ... first transfer pump

70 ... second transfer pump 80 ... charge amount measuring sensor

90 ... controller

The present invention relates to a sludge treatment apparatus for forming a sludge cake by mixing moisture with sludge containing a large amount of water separated from wastewater such as domestic wastewater or industrial wastewater and dehydrating water.

When the wastewater is purged from domestic wastewater, industrial wastewater and livestock wastewater, the wastewater is first settled in the settling tank for a predetermined time, thereby precipitating the sludge suspended in the wastewater, thereby separating the sludge from the wastewater. Since the sludge separated from the settling tank contains a large amount of water, the so-called polymer flocculant is used to remove moisture from the sludge and then recycled or buried in a separate process. A conventional sludge treatment apparatus for dehydrating moisture from sludge to form a sludge cake is shown in Fig. 1 is a schematic block diagram for explaining a conventional sludge disposal apparatus.

Referring to FIG. 1, a conventional sludge treatment apparatus 9 is provided with a stirring tank 1. In this stirring tank 1, a water supply pipe 2a and a polymer flocculant supply pipe 2b are provided, respectively, and water and a polymer flocculant are accommodated in the stirring tank 1 together. An impeller 3 is rotatably installed in the stirring tank 1 so that the polymer flocculant contained in the stirring tank 1 and the water are stirred together and a motor 4 for rotating the impeller 3 is installed . In the stirring tank 1, a polymer flocculant and water are mixed to form an aggregated liquid. It is preferable to mix water at a weight ratio of 95% and polymer flocculant at a weight ratio of 5%. The agglomerated liquid thus formed is conveyed through the transfer pipe 5 and performs an agglomeration reaction with the sludge introduced through the sludge injection pipe 6, whereby moisture in the sludge is deodorized and a sludge cake is formed. A pump 7 is provided between the agitation tank 1 and the sludge injection pipe 6 to transfer the agglomerated liquid discharged from the agitation tank 1 to the sludge injection pipe 6 side. A valve (8) for adjusting the amount of the flocculated liquid discharged from the stirring tank (1) is installed in the transfer pipe (5).

However, the conventional sludge disposal apparatus 9 having the above-described configuration has a problem in that accurate and constant control can not be performed because the user controls the supply amount of water and the polymer flocculant and the supply amount of the flocculation liquid directly. In other words, the aggregated liquid formed in the stirring tank 1 should be formed so that the weight ratio of water is 95% and the weight ratio of the polymer flocculant is 5%. However, when the user directly applies water and the polymer flocculant to the stirring tank 1 The weight ratio could not be met. Accordingly, there is a problem that the concentration of the aggregated liquid is not constant and the moisture content in the finally formed sludge cake can not be constantly displayed.

Meanwhile, since the moisture content of the sludge cake formed through the coagulation reaction between the flocculating liquid and the sludge must be continuously measured, the moisture content of the sludge cake finally formed is measured by a conventional sludge treating apparatus (9) And the water content of the sludge cake is not continuously measured because the sample is intermittently sampled and examined. In addition, when the water content of the sludge cake is measured and the water content is higher than the reference value, the dosage of the flocculating liquid should be controlled by controlling the valve (8) There is a problem in that the control of the valve 8 is performed directly by the user in the device 9, so that accurate control is impossible.

Due to the above problems, the sludge cake formed by the conventional sludge disposal apparatus 9 can not control its moisture content constantly, and the use thereof is very inconvenient.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a sludge cake which can maintain a constant weight ratio of water and flocculant in the flocculating liquid, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a sludge treatment apparatus capable of maintaining a constant water content of the sludge cake formed by the sludge cake.

According to an aspect of the present invention, there is provided a sludge treatment apparatus for sludge separated from wastewater to form a sludge cake by dewatering the sludge, comprising: a sludge injection tube for injecting sludge; And a control unit for controlling the amount of water supplied from the water tank to the transfer pipe, wherein the transfer pipe is disposed upstream of the sludge injection port on the transfer path of the transfer pipe and supplies water to the transfer pipe, A flocculant tank disposed on an upstream side of the sludge inlet on the conveyance path of the conveyance pipe for supplying a sludge flocculant to the conveying pipe for withdrawing moisture from the sludge, a flocculant tank provided in the flocculant tank, The flocculant control valve installed in the transfer pipe to control the amount of the flocculant A stirring tank installed in the transfer pipe between the sludge inlet and the flocculant tank to form a flocculated liquid by receiving and agitating the water supplied to the transfer pipe and the flocculant together, An agitating liquid control valve disposed between the agitating tank and the sludge inlet so as to regulate the amount of the agitating liquid supplied to the transfer piping, and an agitating liquid regulating valve rotatably disposed in the agitating tank so as to agitate the water and the agglutinating agent contained in the agitating tank A first impeller installed, a second rotatably mounted second impeller installed in the transfer pipe between the flocculant tank and the agitating tank so that the water and the flocculant supplied from the water tank and the flocculant tank are stirred before flowing into the agitating tank, Impeller, water and coagulant supplied from the water tank and the flocculant tank to the stirring tank A second transfer pump disposed between the agitation tank and the sludge inlet so as to transfer the agglomeration liquid supplied from the agitation tank to the sludge injection port side, a second transfer pump disposed between the agitation tank and the agitation tank, A charge amount measuring sensor disposed between the sludge inlet port and the discharge port of the transfer pipe to measure the amount of charge of the sludge cake formed by mixing the sludge supplied from the sludge inlet port and the coagulating liquid supplied from the stirring tank, And the flow rate measuring sensor are electrically connected to the valve, the first transfer pump, the second transfer pump, the first impeller, the second impeller, the flocculant control valve, A transfer pump, a first impeller, a second impeller, a flocculant control valve, and a controller for controlling the operation of the charge amount measuring sensor. It is characterized in eojin.

Hereinafter, a sludge treatment apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic block diagram of a sludge treatment apparatus according to a preferred embodiment of the present invention.

2, a sludge treatment apparatus 100 according to a preferred embodiment of the present invention includes a transfer pipe 10, a water tank 20, a water quantity control valve 21, a flocculant tank 30, The first impeller 50, the first conveying pump 60, the second conveying pump 70, the charge amount measuring unit 31, the stirring tank 40, the aggregate liquid adjusting valve 41, the first impeller 45, the second impeller 50, A sensor 80 and a controller 90.

The transfer pipe 10 is a pipe for introducing the sludge separated from the wastewater and the polymer flocculant and the water to be described later to form a sludge cake to be described later and discharging the sludge cake to the outside. The transfer piping 10 includes a water supply pipe 11, a flocculant supply pipe 12, a flocculating liquid mixing pipe 13, a main pipe 14, a sludge injection pipe 15 having a sludge injection port formed at an end thereof, And a discharge pipe (16).

The water tank 20 is for receiving water and supplying the water to the transfer pipe 10. The lower part of the water tank 20 is connected to the water supply pipe 11, And is connected to the coagulating liquid mixing pipe (13). This water tank 20 is located on the upstream side of the sludge injection pipe 15 to be described later on the conveying path of the conveying pipe 10.

The flocculant tank 30 is provided to receive the polymer flocculant and supply the flocculant tank 30 to the transfer pipe 10. The bottom of the flocculant tank 30 is connected to the flocculant supply pipe 12, And is connected to the coagulating liquid mixing pipe (13). The flocculant tank 30 is located on the upstream side of the sludge injection pipe 15 on the transfer path of the transfer pipe 10 and more specifically between the sludge injection pipe 15 and the water tank 20. The water supplied through the water supply pipe (11) and the polymer flocculant supplied through the flocculant supply pipe (12) are mixed with each other in the flocculating liquid mixing pipe (13). The polymer flocculant is used to remove moisture from the sludge through a flocculation reaction with the sludge. Polyacylamide or polyamide flocculants may be used, and other types of polymer flocculants Can be used. The polymer flocculant is present in the form of liquid, gel, and powder, and is preferably diluted with water to adjust the concentration. It is preferable to mix the polymer flocculant and water in a weight ratio of 95% of water and 5% of the polymer flocculant. The water amount control valve 21 and the flocculant control valve 31 are provided for controlling the weight ratio. The water control valve 21 is installed in the water supply pipe 11 and the flocculant control valve 31 is connected to the flocculant supply pipe 12.

The stirring tank 40 is a tank for receiving and mixing the water and the polymer flocculant supplied from the water tank 20 and the flocculant tank 30 together and one end of the stirring tank 40 is connected to the flocculating liquid mixing pipe 13 And the other end is connected to a main pipe 14 to be described later. In the stirring tank 40, a first impeller 45 is rotatably installed so that the polymer flocculant and water are mixed with each other. The first impeller 45 is driven by a first motor 46 provided outside the stirring tank 40. By the rotation of the first impeller 45, the polymer flocculant and water are mixed with each other to form an aggregated liquid and then discharged through the main pipe 14 at the lower end of the stirring tank 40. A flocculation liquid control valve 41 is installed in the main pipe 14 between the sludge injection pipe 15 and the agitation tank 40 to regulate the amount of the flocculating liquid flowing into the main pipe 14 from the agitation tank 40 do.

The second impeller 50 may be configured to mix the water and the polymer flocculant before the water and the polymer flocculant supplied from the water tank 20 and the flocculant tank 30 are introduced into the mixing tank 40 And is rotatably installed in the mixing pipe 13 between the coagulant tank 30 and the stirring tank 40. [ The second impeller 50 is rotated by a second motor 51 mounted on the outside of the mixing pipe 13 under a driving force. The water and the polymer flocculant are first stirred by the second impeller 50 in the mixing pipe 13 and then stirred again by the first impeller 45 in the stirring tank 40 so that water and the polymer flocculant are uniformly stirred do.

The first transfer pump 60 is installed in the mixing pipe 13 between the flocculant tank 30 and the stirring tank 40 and is provided with water and polymer flocculant supplied from the water tank 20 and the flocculant tank 30, To the stirring tank (40). The second transfer pump 70 is disposed between the agitation tank 40 and the sludge injection pipe 15 to transfer the agglomeration liquid formed in the agitation tank 40 to the sludge injection pipe 15 side. The first and second transfer pumps 60 and 70 are usually a bellows type pump or a diaphragm type pump.

One end of the sludge injection pipe 15 is connected to, for example, a sludge storage tank (not shown) in which sludge separated from the wastewater is collected, and a sludge injection port is formed at the other end thereof to be connected to the main pipe 14. The sludge supplied from the agitation tank 40 through the sludge injecting pipe 15 and the flocculated liquid are mixed with each other in the main pipe 14 to perform agglomeration reaction. That is, the flocculant having a positive charge neutralizes the negative charge on the surface of the colloid particle of the sludge, and as the charge on the surface of the colloid particle is neutralized, the particles become accessible to each other and eventually collide with each other. Or van der Waals attraction force to form micro flocs, and these micro flocs again form large flocs by the binding force such as electric attraction force, so that the agglomeration reaction between the sludge and the flocculating liquid is performed. In this process, the long-chain molecular structure of the polymer flocculant plays a role of aggregating the newly formed flocs into one by cross-linking the particle surfaces. The sludge is dehydrated by the coagulation reaction to form a sludge cake.

The sludge cake formed by the coagulation reaction is discharged to the outside through a discharge port formed at the end of the discharge pipe 16. The charge amount measurement sensor 80 is installed between the sludge injection pipe 15 and the discharge port. The charge amount measuring sensor 80 is for continuously measuring the moisture content in the sludge cake through measurement of the amount of charge of the sludge cake before being discharged through the discharge port. The charge amount measuring sensor 80 for the charge amount measurement is constituted by a plurality of electrodes (not shown), a voltage generating device (not shown) and a current measuring device (not shown). The measurement voltage generated by the voltage generating device is applied to the sludge cake through a plurality of electrodes inserted in the sludge cake. The current measuring device measures the current flowing between the two electrodes inserted in the sludge cake. When the moisture content of the sludge cake is high, the intensity of the measured current is high. When the moisture content is low, the intensity of the measured current is low. Therefore, the water content in the sludge cake can be measured through the charge measurement. The configuration of such a charge quantity measuring sensor is presented as an example, and a known device capable of measuring the amount of electric charge or electric current existing in a medium containing moisture can be applied.

The controller 90 controls the flow rate of the fluid flowing through the flow control valve 21, the flocculant control valve 31, the first transfer pump 60, the second transfer pump 70, the first impeller 45, 50, the flocculating liquid control valve 41 and the charge amount measuring sensor 80, respectively, to control their operation. When the moisture content of the sludge cake finally discharged by the charge amount measuring sensor 90 is measured, the amount of the flocculated liquid is adjusted by controlling the opening and closing of the flocculated liquid control valve 41 according to the moisture content. That is, when the moisture content in the sludge cake is high, the amount of the flocculating liquid is increased by increasing the opening amount of the flocculating liquid control valve 41, and in the opposite case, by decreasing the opening amount of the flocculating liquid control valve 41, . In addition, the amount of opening and closing of the water control valve 21 and the flocculant control valve 31 is controlled so that the weight ratio of the water and the polymer flocculant in the flocculation liquid is precisely 95% to 5%. And controls the operation of the first transfer pump 60, the second transfer pump 70, the first impeller 45 and the second impeller 50 to maintain the desired conveying speed and stirring speed.

As described above, the controller 90 of the sludge processing apparatus 100 according to the preferred embodiment of the present invention controls the supply amount of water and the polymer flocculant, and adjusts the supply amount of the flocculating liquid through the continuous measurement of the amount of charge Accurate control is possible, and it is advantageous in that the water content in the finally discharged sludge cake can be kept constant by continuously measuring the charge amount.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

As described above, the sludge treatment apparatus according to the present invention can maintain the weight ratio of water and flocculant in the flocculating liquid constant, and can accurately control the dosage of the flocculating liquid by continuously measuring the water content in the sludge cake, It is possible to keep the water content of the water-based water-based water-based water-based water-based water-based water-based water-based water-based water-

Claims (1)

A sludge treatment apparatus for forming a sludge cake by dewatering sludge separated from wastewater, comprising: A transfer pipe having a sludge inlet for injecting the sludge and an outlet for discharging the injected sludge to the outside; A water tank disposed upstream of the sludge inlet on the conveyance path of the conveyance pipe and supplying water to the conveyance pipe; A quantity control valve installed on the transfer pipe to regulate the amount of water supplied from the water tank to the transfer pipe; A flocculant tank disposed upstream of the sludge inlet on the conveyance path of the conveyance pipe and supplying a sludge flocculant for removing moisture from the sludge to the conveyance pipe; A flocculant control valve installed on the transfer pipe to regulate the amount of flocculant supplied from the flocculant tank; A stirring tank installed in the transfer pipe between the sludge injection port and the flocculant tank so as to supply and agitate the water and the flocculant supplied to the transfer pipe together to form an aggregated liquid and supply the flocculated liquid to the transfer pipe; An agitating liquid control valve disposed between the agitating tank and the sludge inlet so as to regulate the amount of the agitating liquid supplied to the transfer pipe; A first impeller rotatably installed in the stirring tank for stirring the water and the flocculant contained in the stirring tank; A second impeller rotatably installed in the transfer pipe between the flocculant tank and the agitating tank so that the water and the flocculant supplied from the water tank and the flocculant tank are stirred before flowing into the agitating tank; A first transfer pump installed in the transfer pipe between the flocculant tank and the agitating tank so as to transfer the water and the flocculant supplied from the water tank and the flocculant tank to the agitating tank; A second conveying pump disposed between the stirring tank and the sludge inlet so as to convey the aggregated liquid supplied from the stirring tank to the sludge inlet side; A charge amount measuring sensor disposed between the sludge inlet port and the discharge port of the transfer pipe to measure the amount of charge of the sludge cake formed by mixing the sludge supplied from the sludge inlet and the aggregated liquid supplied from the stirring tank; And The flow rate control valve, the flocculant control valve, the flocculant control valve, the flocculant control valve, the first transfer pump, the second transfer pump, the first impeller, the second impeller, And a controller for controlling operations of the first transfer pump, the second transfer pump, the first impeller, the second impeller, the aggregate liquid control valve, and the charge amount measuring sensor.

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