KR20060031323A - Sludge treatment system - Google Patents

Abstract

The present invention relates to a sludge treatment system, and more particularly, to a system for condensing and dewatering sludge generated in a sewage treatment plant, a wastewater treatment plant, etc., and the sludge concentration supplied to the dehydrator while occupying a small installation area is good by a simple configuration. To keep it constant and to reduce maintenance costs.

The present invention is connected to the sludge storage tank (1), the coagulation tank (2), the dehydrator (4) in series in the pipeline (6), the coagulant tank in parallel with the sludge storage tank (1) in the coagulation tank (2). (5) to the conduit (7), the sludge storage tank (1), the coagulant tank (5) and the coagulation tank (2) is provided with stirring means (1 ', 5', 2 ') respectively In the condensation tank 2, the condenser 30 is integrally installed at the outlet pipe 6 'portion of the side of the condensation tank 2, and the concentrator 30 forms an inlet 131 at the upper portion, A housing (130) connecting the valve (133) to the drain pipe (132); Both ends of the plurality of plate fixing bars 141 are coupled to each other so that vertical constant intervals are formed, and both ends are supported by support bars 148 and 148 'at intervals formed between the plate fixing bars 141. A plurality of plate-shaped flow bars 146 are inserted to form a micro gap, and brackets 149 and 149 'are formed on plate fixing bars 141 on both sides of the plate fixing bars 141 to form the inflow portion ( Separating means 140 fixed to the horizontal portion 131; Installed below the plate-shaped flow bar 146 is composed of a flow bar driving means 160 for elevating the plate-shaped flow bar 146.

Sludge storage tank, flocculation tank, dehydrator, flocculant tank, concentrator, housing, separation means, plate fixing bar, plate flow bar, support bar, flow bar driving means, drive plate, camshaft

Description

Sludge Treatment System {SLUDGE PROCESS SYSTEM}

1 is a block diagram of an embodiment of the present invention

2 is a longitudinal sectional side view of an essential part of the embodiment of the present invention;

3 is a cross-sectional view taken along the line A-A of FIG.

4 is an exploded perspective view of main parts of an embodiment of the present invention;

5a to 5d are functional state diagrams of embodiments of the present invention.

6 is a block diagram of a conventional one

7 is a longitudinal cross-sectional view of a thickener of the prior art;

               <Explanation of Signs of Major Parts of Drawings>

1: sludge storage tank 2: flocculation tank 4: dehydrator

5: coagulant tank 30: concentration device 130: housing

140: separating means 141: plate fixing bar 146: plate flow bar

148,148 ': support bar 160: flow bar driving means 161.161': drive plate

164: camshaft

The present invention relates to a sludge treatment system, and more particularly, to a system for concentrating and dewatering sludge generated in a sewage treatment plant, a wastewater treatment plant, and the like.

As is well known, the sludge from which the supernatant is separated in a sedimentation tank such as a sewage treatment plant or a wastewater treatment plant is usually low in concentration (water content of 99.3 to 99.5% by weight), and the low concentration of sludge is usually used by a vehicle for landfilling, incineration, or recycling. When it is transported to another place, it is concentrated and dehydrated to reduce the logistics cost by improving its transportation efficiency.

6 is a configuration diagram of a conventional sludge treatment system, in which a sludge storage tank 1, a coagulation tank 2, a concentrator 3, and a dehydrator 4 are connected in series with a conduit 6, and the coagulation is also performed. A coagulant tank (5) is connected to the tank (2) in parallel with the sludge storage tank (1) by a conduit (7), and the stirring means for the sludge storage tank (1), the coagulant tank (5) and the coagulation tank (2). (1 '), 5', and 2 ', respectively, and pumps 8 and 9 are provided in the discharge side conduits 6 and 7 of the sludge storage tank 1 and the coagulant tank 5, respectively. will be.

The sludge treatment system overflows and separates the supernatant from the settling tank (not shown), and then the sludge of the low concentration precipitated is transferred to and stored in the sludge storage tank 1, while the coagulant tank 5 stores the coagulant and the sludge storage tank. The sludge of (1) is transferred to the coagulation tank (2) by the pump (8) and the coagulant of the coagulant tank (5) is injected into the coagulation tank (2) by the pump (9) to stir the sludge and the coagulant. (2 ') to form a floc (flock) and then conveyed to the concentrator (3) to concentrate the water content of 95 ~ 97% by weight, the sludge concentrated in the water content of 95 ~ 97% by weight in the dehydrator (4) The water content is dehydrated at less than 90% by weight.

As described above, if the concentrator 3 is installed in the front stage of the dehydrator 4 to concentrate the sludge at low concentration, the dewatering efficiency can be increased by maximizing the performance when the sludge is dewatered from the dehydrator 4. .

Meanwhile, as shown in FIG. 7, the concentrator 3 has a rotary shaft 15 that is rotated by the drive motor 16 on the bed 13, and a connecting bar 17 on the rotary shaft 15. A screen 14 installed in the; A sludge supply pipe 18 guided inside one side of the screen 14; A collecting part 19 and a solid content collecting part 20 installed at the lower side and the other side of the screen 14; The casing 21 is installed on the outer circumference of the screen 14 to be installed horizontally between the upper portion of the screen 14 and the casing 21, and constituted by a cleaning tube 22 having nozzles 23 disposed at a predetermined interval. Thus, the rotating shaft 15 is rotated by the drive motor 16 to rotate the screen 14 at a constant speed while the sludge flocculated in the flocculation tank 2 via the sludge supply pipe 18 through the screen 14. When supplied to the inside of the solid content and water is separated, that is, the sludge is concentrated, the water is dropped to the collecting section 19, the solid content is dropped to the solid collection section 20, the solid content is supplied to the dehydrator (4) dehydration It is.

The sludge treatment system occupies a large installation area and increases installation cost by installing a separate condenser 3 having a large volume between the coagulation tank 2 and the dehydrator 4, and the concentration of sludge is increased in water temperature, season, The concentration varies greatly depending on the installation location, so even if the concentration of sludge is suitable for dehydration, that is, when the water content is 95 to 97% by weight, the concentrator 3 must be operated. The problem that causes the performance deterioration of (4) occurs.

When the concentration of the sludge is suitable for dehydration, it may be considered to install a pipeline bypassing the concentrator 3 in order not to operate the concentrator 3, but an additional cost is required when installing the bypass pipeline. Will be.

A sludge concentrator capable of automatically adjusting the flocculant dose and the sludge concentration to correct the problems of the sludge treatment system is disclosed in Utility Model Registration No. 319572, which is a flocculation tank To adjust the concentration of sludge supplied to the dehydrator by installing an automatic water discharge device in the inside of the tank, and the automatic water discharge device has a spiral blade formed on the rotating shaft of the stirring means to form a predetermined interval with the rotating shaft. Fixing the upper and lower ends, and coupling a plurality of plate-shaped ring-shaped disks around the rotational axis of the spiral blades with fastening pins to form a predetermined interval by the spacer, the plate-shaped ring-shaped disks at the interval formed between the plate-shaped ring-shaped disks A plate-shaped movable disk with a larger outer diameter has a horizontal gap between the fixed disk and the movable disk. A water discharge screen is formed to be inserted, and a drain pipe having a valve is connected to the bottom of the coagulation tank.

The sludge concentrator is a flocculant when the sludge and the flocculant conveyed in the coagulation tank is mixed by the stirring means, the water flows into the water discharge screen through a horizontal gap formed between the fixed disc and the movable disc when the sludge is moved upward. On the other hand, when the rotating shaft rotates, the spiral blade swings the movable disk laterally and rubs with the fixed disk to prevent the horizontal gap from being blocked by the solids so that the water flows into the water discharge screen well, and the water is discharged. The water flowing into the screen is discharged to the outside through the rotating shaft and the drain pipe, that is, to concentrate the sludge in the coagulation tank to supply to the dehydrator to maintain a constant concentration of sludge.

However, the sludge concentrating device of the sludge treatment system is moved into the upper portion of the water discharge screen through a horizontal gap formed between the fixed disk and the movable disk as the flocculated sludge is moved to the upper layer when the stirring means of the coagulation tank are rotated. At the same time, the direction is changed and the centrifugal force is generated by the spiral blades, which prevents water from flowing smoothly into the horizontal gap, resulting in low sludge concentration efficiency. Driven in conjunction with the sludge concentration in the coagulation tank, even if the concentration is suitable for dewatering the water discharge screen is always driven to wear and there is a problem that the life is shortened.

The present invention is to provide a sludge treatment system to correct the above problems, to maintain a good and constant concentration of sludge supplied to the dehydrator while occupying a small installation area, and to reduce the maintenance cost The purpose.

In order to achieve the above object, the present invention is connected to the sludge storage tank, the coagulation tank, the dehydrator in series in the pipeline, connecting the coagulant tank in parallel with the sludge storage tank to the coagulation tank, the sludge storage tank In each of the coagulant tank and the coagulant tank is provided with agitation means, the concentrating device is integrally installed in the outlet pipe portion of the side surface of the coagulant tank, the concentrating device forms an inlet in the upper portion, the valve is installed in the lower portion A housing connecting the drain pipe; Combine both ends of the plurality of plate fixing bars to form a vertical constant interval, and insert a plurality of plate-like flow bars supporting both ends with a support bar at a gap formed between the plate fixing bars, so that a small gap is formed, Separation means fixed to the inlet by forming a bracket on the plate fixing bars on both sides of the fixed bar; Installed below the plate flow bar is configured as a flow bar drive means for lifting the plate flow bar.

1 is a configuration diagram of an embodiment of the present invention, Figure 2 is a longitudinal sectional side view of the main portion of the embodiment of the present invention, Figure 3 is a cross-sectional view taken along line AA of Figure 2, Figure 4 is an exploded perspective view of the main portion of the embodiment of the present invention, In the present invention, the same components as those in the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

30 is a concentrating device, and the concentrating device 30 is installed at a position lower than the lower portion of the outlet pipe line 6 'at the outlet pipe line 6' of the side surface of the agglomeration tank 2, and the housing 130, separation means 140, flow bar driving means 160 is roughly divided.

The housing 130 has a lower side than the height of the agglomeration tank 2 at the side of the agglomeration tank 2 and at the same time forms an inlet 131 of the flocculated sludge at the top, and a valve 133 at the bottom. It is connected to the drain pipe 132 laid.

The separating means 140 forms the support holes 142 and 142 'at both ends of the plurality of plate-shaped fixing bars 141 and sandwiches the spacers 143 and 143' between the fixing rods 144 and 144. coupled to ") at a predetermined interval [a spacer (143, 143 vertically between the plate-like fixing bars 141 ') the same distance as the thickness of] this support bolt 145 (145') to be held, and the plate-like floating bars ( 146 is formed to have a width slightly smaller than a predetermined interval formed between the plate-shaped fixing bar 141, and support grooves 147 and 147 'are formed at both ends thereof to support grooves 147 and 147'. The support bars 148 and 148 'are supported on each other so that a minute gap is formed between both sides of the plate flow bar 146 and the plate fixing bar 141 at the interval formed between the plate fixing bars 141. Inserting, forming the brackets 149, 149 'on the plate fixing bars 141 on both sides of the plate fixing bar 141, bolts 150, 150 around the inlet 131 of the housing 130 Fixed with '), same as above When the brackets 149 and 149 'are fixed to the housing 130, the upper surface of the separating means 140 is exposed and the lower portion is received in the housing 130, and at the same time, the upper and lower portions of the separating means 140 are partitioned. The moisture contained in the flocculated sludge before the flocculated sludge is supplied to the dehydrator 4 through the outlet pipe line 6 'via the separating means 140 is plate-shaped bar 141 by gravity. ) And the flocculant sludge that is dropped into the microgap formed between the plate flow bar 146 is concentrated.

The flow bar driving means 160 lifts the plate flow bar 146 to clean the solids in the sludge that has entered the microgap when the floculated sludge is concentrated while passing vertically through the separation means 140.

The flow bar driving means 160 is provided with driving plates 161 and 161 'having support grooves 162 and 162' formed at both sides of the support bars 148 and 148 ', and the bracket ( 149, 149 'is provided at the bottom of the support bracket 163, 163' so that the camshaft 164 can be inserted into the support grooves 162, 162 'of the drive plates 161, 161'. The shaft is installed, and one end of the cam shaft 164 is connected to the drive source 165 and the chain 166 installed in the upper portion of the coagulation tank 2 by the drive source 165 by the cam source 165 when the sludge needs to be concentrated. By rotating the drive plates 161 and 161 ', and by raising and lowering the plate flow bar 146 by lifting and lowering the drive plates 161 and 161'.

In addition, the valve 133 controls the concentration of the sludge of low concentration by adjusting the discharge when the water separated from the separating means 140 is discharged to the drain pipe 132 by manually operating the opening and closing degree, or the sludge storage tank The concentration meter 167 is installed in the outlet side conduit 6 of (1) to automatically detect the concentration of sludge transferred from the sludge storage tank 1 to the coagulation tank 2, and the valve 133 by the output signal. Is proportional control.

As described above, the present invention transfers the sludge stored in the sludge storage tank 1 to the coagulation tank 2 by the pump 8 and simultaneously transfers the coagulant stored in the coagulant tank 5 by the pump 9. 2), the sludge is flocculated by the stirring means 2 'of the coagulation tank 2, and then the water level as shown in FIG. 1 is passed through the outflow pipe 6' formed on the side of the coagulation tank 2. It supplies to the dehydrator 4 and dehydrates, maintaining.

When the sludge is dewatered in the dehydrator 4 as described above when the concentration of the sludge supplied to the dehydrator 4 is not suitable for dehydration of the dehydrator 4, that is, from the sludge storage tank 1 to the coagulation tank 2. When the water content of the sludge to be conveyed is excessive, the valve 133 attached to the drain pipe 132 according to the concentration of the sludge is increased when the concentration is low, the opening degree is increased when the concentration is high, or the sludge storage tank 1 When the opening degree of the valve 133 is adjusted by the output signal of the densitometer 167 installed in the discharge side conduit 6 of the plate, when the flocculated sludge passes through the upper part of the concentrator 30, the plate fixing bar 141 ) And the water contained in the sludge of low concentration through the micro-gap formed between the plate flow bar 146 and the gravity fall to the housing 130 by gravity to separate the water and solids, that is, the sludge is concentrated to 95 ~ 97 weight % Of sludge Can be supplied to a dehydrator (4), the separated water is discharged to a drain 132.

On the other hand, when a low concentration of sludge is concentrated as described above, a part of solids is infiltrated into the microgap, and when a part of the solids is infiltrated into the microgap as described above, the performance of the separation means 140 is reduced. When the sludge of low concentration is concentrated in the means 140, when the flow bar driving means 160 is driven, that is, when the cam shaft 164 is driven by the driving source 165, the driving plate 161 is formed along the contour of the cam shaft 164 ( 161 'rises, the plate-shaped flow bar 146 supported by the drive bars 161 and 161' with the support bars 148 and 148 'rises to the state of FIG. 5C, and the camshaft 164 When the external force is removed from the driving plate 161 (161 ') by the continuous rotation of the plate flow bar 146 due to the weight of the plate flow bar 146, the plate-like flow bar 146 is lowered to the state of FIG. Concentration of the sludge by automatically cleaning the solids infiltrating into the small gap between the bar 141 and the plate-shaped flow bar 146 It can be improved the rate.

When the micro-gap is cleaned by the flow bar driving means 160 as described above, the plate-shaped flow bar 146 is supported by the support bars 148 and 148 ', and is driven at both ends of the support bars 148 and 148'. By installing the plates 161 and 161 'and elevating only the driving plates 161 and 161' by the camshaft 164, the life of the plate-shaped flow bar 146 can be extended and the plate-shaped flow bar 146 It is possible to move up and down smoothly.

When the concentration of the sludge supplied from the sludge storage tank 1 to the dehydrator 4 is less than the concentration at which the performance of the dehydrator 4 is maximized, that is, when the water content of the sludge is small, the valve 133 attached to the drain pipe 132 is provided. ) Is closed by manual or densitometer 167 output and at the same time the drive of the flow bar driving means 160 stops the sludge flocculated in the agglomeration tank 2 to the dehydrator 4 without being concentrated. It is supplied.

The present invention is a simple configuration that combines the separation means 140 formed of the plate-shaped fixing bar 141 and the plate-like flow bar 146 and the flow bar driving means 160 on one side of the cohesion tank 2 as described above and its The small-density concentrator 30 is integrally installed in the coagulation tank 2 so that the sludge of low concentration is concentrated by gravity through the concentrator 30 before the sludge of low concentration is supplied to the dehydrator 4. It can keep the concentration efficiency good while occupying a small, can extend the life and reduce the maintenance cost.

In the above-described embodiment, the driving plates 161 and 161 'are elevated by one cam shaft 164. However, when the length of the plate-shaped flow bar 146 is long, the driving plates 161 and 161' are driven. In this case, the cam plate 164 may be installed to drive the driving plates 161 and 161 ', and when the two cam shafts 164 are installed as described above, the plate-shaped flow bar 146 may be installed. It is possible to further improve the horizontal elevation of).

As described above, the present invention integrates the condensing tank of the sludge treatment system into a condensation tank, a separating means formed of a plate-shaped bar and a plate-flow bar, and a concentrating device having a simple structure and a small volume combined with the flocculating tank. The installation area occupies a small installation area, and concentrates to exert the dehydrating performance of the dehydrator to the maximum only when the sludge supplied to the dehydrator is low in concentration, thereby extending the life and reducing the maintenance cost.

Claims (4)

A sludge storage tank, a flocculation tank, and a dehydrator are connected in series in a pipeline, and a flocculation tank is connected to the flocculation tank in parallel with the sludge storage tank, and agitation means are respectively connected to the sludge storage tank, the flocculation tank, and the flocculation tank. In the installed, the condensing device is integrally installed in the outlet pipe portion of the side of the coagulation tank, the concentrating device is formed in the upper inlet, the lower portion connected to the valve installation drain pipe; Combine both ends of the plurality of plate fixing bars to form a vertical constant interval, and insert a plurality of plate-like flow bars supporting both ends with a support bar at a gap formed between the plate fixing bars, so that a small gap is formed, Separation means fixed to the inlet by forming a bracket on the plate fixing bars on both sides of the fixed bar; A sludge treatment system comprising a flow bar driving means installed below the plate flow bar to move the plate flow bar up and down. According to claim 1, wherein both sides of the support bar is provided with a driving plate formed with a support groove, the support bracket is provided on the bottom of the bracket to install the cam shaft to be inserted into contact with the support groove of the drive plate, the cam shaft Sludge treatment system with one end connected to the drive source and chain. The sludge treatment system of claim 1, wherein the valve is operated manually. The sludge treatment system of claim 1, wherein the valve is proportionally controlled by an output signal of a densitometer installed in an outlet conduit of the sludge storage tank.

Images