JP2006334523A - Apparatus for subjecting turbid water to solid-liquid separation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform a step of subjecting turbid water to a flocculation reaction and draining work in the same unit. <P>SOLUTION: The apparatus for subjecting turbid water to solid-liquid separation is provided with: a flocculation-cum-drainage tank 10 into which turbid water A is supplied; a flocculant supply unit 20 for supplying a flocculant into the flocculation-cum-drainage tank 10; and draining unit 50 arranged partially on the side face of the flocculation-cum-drainage tank 10. Turbid water is subjected to the flocculation reaction in the flocculation-cum-drainage tank 10 and separated into a flocculated/solidified material C and clean water B by solid-liquid separation. The clean water is drained to the outside through the draining unit 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to marine, harbor, lake, or river dredging sludge, muddy water generated in various civil engineering works, wastewater generated in water and sewage or human waste water treatment processes, or industrial wastewater containing sludge and pollutants. A turbid water solid-liquid separator that mixes flocculant with a slurry containing a large amount of liquid such as wastewater (hereinafter referred to as “turbid water”), and separates and discharges the purified water and flocculent solid solids. Is.

In order to separate solid liquid from turbid water such as sludge, supply the turbid water stored in a tank etc. to the coagulator and mix the coagulant such as polyaluminum chloride in the coagulator to solid matter in muddy water To flock. Then, the flocculent turbid water is transferred to a solid-liquid separation device and subjected to solid-liquid separation treatment into purified water and agglomerated solids.
Conventionally, SS (suspended solid content) of flocculent turbid water has a relatively small particle size of 1 mm or less and high resolubility so that it can be passed through a fine filtration membrane and further solid-liquid. Separation was necessary, and solid-liquid separation was performed using a strong compressive force with a high-pressure filter press or the like.
Japanese Patent No. 3317949

With the high processing cost of high-pressure filter press, the cost of the dredging business is increased, which is a major factor that hinders the promotion of dredging business.
In addition, the turbid water flock process and the solid-liquid separation process must be performed by separate devices, so there is a problem of securing the installation space of these devices and the need to improve the processing efficiency by performing each process with individual dedicated devices. It has been pointed out.

The present invention has been made in view of the above points, and an object of the present invention is to provide at least the following one turbid water solid-liquid separator.
(1) The turbid water coagulation reaction step and the drainage operation should be performed with the same device.
(2) To improve the processing efficiency of turbid water solid-liquid separation.

In order to achieve the above object, a first invention of the present application is a solid-liquid separation apparatus that performs a turbid water agglomeration reaction step and a drainage operation by mixing flocculated water with an aggregating material, and a combined tank for supplying turbid water; A flocculant supply device for supplying the flocculant into the dual-purpose tank; and a drainage device disposed at a part of the side surface of the dual-purpose tank; The separated purified water is drained out of the tank through the drainage device.
The second invention of the present application is characterized in that in the first invention, a stirrer for stirring the combined tank is additionally provided.
The third invention of the present application is characterized in that, in the first invention or the second invention, a drainage device is additionally provided in a part of the combined tank.
According to a fourth aspect of the present invention, in the third aspect of the present invention, the drainage device is pivotally supported so as to be rotatable in the horizontal direction of the dual-purpose tank, and a plurality of rotation plates that are fitted into and integrated with the rotation shaft, And a screen interposed between the rotating plates, and is constructed by being incorporated in a window hole established on one side of the dual-purpose tank while maintaining water-stopping property.
According to a fifth invention of the present application, in the third or fourth invention, a shielding plate capable of sealing a window hole is provided inside the combined use tank of the drainage device, and the shielding plate is slid to open and close the window hole. It is characterized by being configured to be possible.
The sixth invention of the present application is characterized in that, in any one of the third to fifth inventions, an auxiliary drainage device is additionally provided in a part of the combined tank.

The present invention can obtain at least one of the following effects.
(1) The turbid water coagulation reaction process and the solid-liquid separation of purified water can be performed using the same device, and the operation can also be performed continuously without transferring the flocked turbid water to another device. Compared with this, the processing efficiency can be greatly improved.
(2) The drainage work can drain a large amount of purified water by using the drainage device and the auxiliary drainage device together, and the solid-liquid separation process can be efficiently performed as well as improving the efficiency of the drainage work itself. Can do.

  Embodiments of the present invention will be described below with reference to the drawings.

(1) Outline of Solid-Liquid Separator FIG. 1 shows a model diagram of the solid-liquid separator, and FIGS. 2 to 5 show each part of the solid-liquid separator.
This solid-liquid separation device includes a combined tank 10 that combines the turbid water A coagulation reaction step and the drainage operation, and a flocculant supply device 20 that is disposed on the upper part of the combined tank 10 and supplies the flocculant into the tank 10. The agitator 30 is provided in the upper part of the combined tank 10 and stirs the muddy water A in the tank 10 in order to promote the flocking of the solid matter contained in the muddy water A.
Further, the solid-liquid separation device includes a drainage device 50 and an auxiliary drainage device 60 respectively disposed on part of the side surface of the combined use tank 10 so that the supernatant of the purified water B separated into the solid and liquid can be drained out of the tank. It has become.
Hereinafter, each part is explained in full detail.

(2) Combined tank The combined tank 10 is a bottomed structure having a rectangular or circular cross-sectional shape, and its capacity and shape are appropriately selected according to the usage and scale. A chute 11 is provided at the opening serving as a discharge port at the bottom of the combined use tank 10, and the solidified solid C separated by solid-liquid separation can be discharged out of the tank 10 by opening and closing the discharge port by opening and closing the chute 11. It is like that.

A muddy water supply pipe is connected to the upper part of the combined use tank 10, and a predetermined amount of muddy water A can be supplied into the combined use tank 10 by operating a muddy water supply pump (not shown).
Further, a water supply pipe (not shown) may be additionally provided in the dual-purpose tank 10 to dilute muddy water or wash the tank by arbitrarily supplying water such as tap water or well water.

(3) Coagulant supply apparatus The coagulant supply apparatus 20 provided in the upper part of the combined use tank 10 is an apparatus having a known configuration, and adjusts the coagulant in an amount corresponding to the supply amount of turbid water toward the combined use tank 10. Any known device can be used as long as the device has a function that can be supplied.
Examples of the aggregating agent used in the aggregating reaction include the followings. The particle size of the flocculated turbid water SS (suspended solids) has a large diameter of 1 mm or more, and the resolubility is lower than the conventional one. A flocculant is used.

  As this type of flocculant, for example, a gypsumander, aqua fine, etc. can be used.

(4) Stirrer The stirrer 30 includes a motor 31 mounted on the upper part of the dual-purpose tank 10, and a rotary shaft 32 integrally formed with a stirring blade 33 penetrating the upper part of the dual-purpose tank 10 and arranged vertically in the tank. Have
The agitation blades 33 are provided at a plurality of locations on the upper and lower stages of the rotating shaft 32 to substantially uniformly agitate the entire area in the dual-purpose tank 10.
Although this example shows a case where two agitators 30 are arranged, the number of agitators 30 to be installed is appropriately selected according to the capacity of the combined tank 10.
Further, the shape of the upper and lower stirring blades 33 is not limited to the propeller shape, but may be a blade having an L shape as a whole, and the combination of the upper and lower stirring blades 33 may be a combination of the same shape or different shape. Alternatively, the rotational speeds of the blades 33 arranged in a multi-stage as a multi-axis superposition structure in which the rotary shafts 32 are coaxially arranged may be different combinations.
By appropriately selecting the shape and length of the blades 33 or the number of installation stages of the blades 33, the aggregated solids floating to adhere to the inner peripheral wall of the tank 10 can be deflected toward the center of the tank, You may make it raise the flock and solid substance which are made to generate | occur | produce or sink to an arbitrary bottom part and are stagnating.

(5) Drainage device On one side of the combined tank 10, a plurality of drainage devices 50 are incorporated in the respective window holes 10 a opened with a plurality of side portions as drainage ports.
With reference to FIGS. 6 and 7, a rotating disk type dewatering drainage device 50 will be described.
The drainage device 50 is a device that maintains a water shielding function when stationary and exhibits a drainage function to the outside of the tank 10 when rotating, and a rotating shaft 51 that is pivotally supported in the horizontal direction of the dual-purpose tank 10 and rotates. A motor 52 that rotationally drives the shaft 51, a plurality of rotating plates 53 that are fitted and integrated with the rotating shaft 51, and a screen 54 that is interposed between the rotating plates 53.

In this example, as shown in FIG. 2, a plurality of drainage devices 50 are assembled to correspond to each of the window holes 10 a (see FIG. 8) extending in two stages above and below the side surface of the combined use tank 10 and opened in a staggered manner. In addition, although a configuration in which the rotation shaft 51 and the motor 52 of the plurality of drainage devices 50 are shared in a row unit (one horizontal row) is shown, the rotation shaft 51 and the motor 52 may be independent.
Moreover, the arrangement | positioning form of the drainage device 50 is not only arranging the drainage device 50 of the length shorter than the side crossing length of the combined use tank 10 like this example, but also having the side crossing length of the combined use tank 10 in several numbers. You may make it arrange | position the drainage apparatus 50 in multistage.
In any arrangement form, a plurality of drainage devices 50 are continuously arranged along the vertical direction of the side surface of the combined use tank 10 and can be drained following the change in the level of the purified water B in the combined use tank 10. Thus, it is comprised so that operation | movement of the motor 52 of each drainage apparatus 50 can be controlled separately. All the rotating shafts 51 that are pivotally arranged in parallel from the upper side to the lower side are configured to rotate forward or reverse in the same direction.

When the plurality of rotating plates 53 are inserted into the rotating shaft 51, ring-shaped spacers 55 are inserted into the rotating shaft 51 so that the gaps between the rotating plates 53 are set accurately and uniformly.
Further, a plate-like screen 54 for filling a gap is interposed between the side surfaces of the adjacent rotating plates 53 and between the rotating plates 53 and the tank 10 at both ends.
In FIG. 7, for the sake of easy understanding, the thickness of the rotating plate 34 and the screen 54 is enlarged with respect to the diameter of the rotating plate 53, but the thickness of the rotating plate 53 and the screen 54 is actually shown in FIG. It is a thin plate thickness of about 1 mm.
The screen 54 has a thickness slightly smaller than the ring-shaped spacer 55 described above, and is a plate or rod having a length that can vertically cut the window hole 10a to which the drainage device 50 is to be incorporated. It is accommodated vertically on both sides, and its upper and lower ends are fixed to the combined use tank 10.
In order to block the gap between the rotating plates 53 adjacent to each other, the front surface of the screen 54 is cut out at equal intervals so that the corresponding positions of the rotating shafts 51 are extended below the rotating shaft 51. Is formed.

Each drainage device 50 adjacent in the vertical direction forms a minute gap smaller than the diameter of the muddy water SS between the circumferential surfaces of the rotating plate 53, and the rotating plate 53 passes through this minute gap when rotating. The purified water B can be drained out of the tank 10.
Further, by forming the width of the spacer 55 to be larger than the width of the screen 54, a minute gap is formed between the side surface of the rotating plate 53 and the side surface of the screen 54, and aggregated solids in muddy water are formed from this minute gap. The purified water B can be drained out of the tank 10 while preventing filtration.

Although the drainage device 50 assembled in each window hole 10 of the combined use tank 10 is sealed by the screen 54 and a large number of rotating plates 53, it is difficult to maintain complete water shielding.
Therefore, as shown in FIG. 8, a sliding type shielding plate 56 of a size capable of sealing each window hole 10 a is provided inside the combined use tank 10, and each window hole 10 a is highly waterproofed from the inside by these shielding plates 56. The window holes 10a are opened by lifting and lowering the shielding plate 56 during drainage.
As shown in an enlarged view in FIG. 6, each shielding plate 56 is engaged with the guide rails 12 provided on both sides thereof in parallel with each other in a vertical direction while maintaining waterstop. And by raising and lowering with the expansion and contraction operation of the cylinder 57 arranged on the upper part of the combined use tank 10, it is possible to close the window hole 10a during the turbid water agglomeration reaction step and open the window hole 10a during the drainage work. Become.

  Further, a water collecting basin 58 is provided on the side surface of the combined use tank 10 so as to surround the plurality of drainage devices 50 from below, and the purified water B can be collected by the water collecting basin 57.

(6) Auxiliary drainage device Auxiliary drainage device 60 is incorporated in each side hole 10b opened on the side surface of the dual-use tank 10 other than the drainage device 50 provided as a drainage port.
The auxiliary drainage device 60 includes a removable mesh filter 61, a shielding plate 62 that can block and open the window hole 10b, a cylinder 63 that raises and lowers the shielding plate 62, and a filter 61 that extends downward from the window hole 10b. A water collecting tank 64 is provided so as to be surrounded by the water.
The mesh body 61 is a perforated structure in which a minute opening having a size smaller than the diameter of the muddy water SS is formed. For example, a known wire mesh can be applied, and the mesh body 61 is attached to the combined tank 10 provided with a frame body by bolting.
As shown in FIG. 9, the shielding plate 62 has a size capable of blocking the window hole 10 b, and engages with the guide rails 12 provided on both sides thereof in parallel with each other in a vertical direction while maintaining water-stopping properties.
The window hole 10b is closed during the turbid water agglomeration reaction process and opened during the drainage operation by moving up and down along with the expansion and contraction of the cylinder 63 disposed in the upper part of the combined tank 10. Therefore, since the formation range of the window hole 10b becomes a drainage section, it is desirable to form in the upper half part of the combined use tank 10.
The auxiliary drainage device 60 is not an essential element of the device, and the auxiliary drainage device 60 may be omitted.

(7) Solid-liquid separation process Next, the solid-liquid separation process method of muddy water is demonstrated.
In FIG. 1, a predetermined amount of muddy water is supplied into the combined tank 10 in a state where the window holes 10 a and 10 b are blocked by the shielding plates 56 and 62.
Next, after supplying the coagulant | flocculant of the quantity corresponding to the supply amount of the muddy water A through the coagulant | flocculant supply apparatus 20 in the combined tank 10, the stirrer 30 is operated and it stirs and mixes.
When the flocculant is agitated and mixed with the turbid water A, the solid matter in the turbid water A starts to agglomerate, and as a result, flocculation is promoted over time. .
Thereby, the solid-liquid separation effect | action of the purified water B and the aggregation solid substance C advances in the combined use tank 10. FIG.

Waiting for the passage of a predetermined agglomeration time, the rotation of the rotating plate 53 group of the drainage device 50 is started, and at the same time, the shielding plates 56 and 62 are slid to open the window holes 10a and 10b.
As a result, the purified water A that has been filtered through the minute gap between the peripheral surfaces of the rotating plate 53 group constituting the drainage device 50 and the screen 54 is drained out of the tank 10 and collected in the drainage basin 58. The supernatant of the purified water B is drained by sequentially operating the drainage device 50 over an arbitrary range from the upper stage to the lower stage among the plurality of drainage apparatuses 50 arranged in multiple stages in the combined use tank 10.

During the drainage work by the drainage device 50, the flocculent aggregated solid matter floating in the tank 10 may clog the gaps of the rotating plate 53.
Since the flocculent aggregated solid matter can be removed by rotating the rotating plate 53, the drainage operation of the purified water B can be performed smoothly without clogging.

  On the other hand, the purified water A filtered by the filter 61 constituting the auxiliary drainage device 60 is drained to the outside of the tank 10, and the drained purified water B is collected in the water collecting tank 64.

With the drainage of the purified water B by the drainage device 50 and the auxiliary drainage device 60, the solid agglomerated solid C separated in the combined tank 10 remains.
Finally, the agglomerated solid C remaining at the bottom of the dual-purpose tank 10 is discharged to the outside of the tank 10 by dropping its own weight by opening the chute 11.

As described above, the process of agglomerating turbid water A and the draining operation of purified water B can be performed using the same combined tank 10, and the operation is continuously performed without transferring the flocked turbid water A to another apparatus. Therefore, the processing efficiency can be greatly improved compared to the conventional method.
In addition, the drainage work can be performed by treating a large amount of purified water B by using the drainage device 50 and the auxiliary drainage device 60 together, and the solid-liquid separation process can be efficiently performed as well as improving the efficiency of the drainage work itself. It can be carried out.

Cross-sectional model diagram of solid-liquid separation device according to the present invention Side view of the solid-liquid separator on the side where the drainage device is installed Side view of the solid-liquid separator on the side where the auxiliary drainage device is installed Sectional view of IV-IV in FIG. Sectional view of VV in FIG. Horizontal section of the drainage device with some parts omitted Perspective view of the drainage device with some parts omitted Sectional view of the drainage device side from the inside of the combined use tank Sectional view of the auxiliary drainage device from the inside of the combined tank

Explanation of symbols

A ... Muddy water B ... Purified water C ... Coagulation solid installation 10 ... Combined tank 11 ... Chute 12 ... Guide rail 20 ... Coagulant supply device 30 ... Agitator 31 ... Motor 32 ... Rotary shaft 33 ... Agitating blade 50 ... Drain device 51・ ・ ・ ・ Rotary shaft 52 ・ Motor 53 ・ Rotary plate 54 ・ Screen 55 ・ Spacer 56 ・ Shielding plate 58 ・ ... Water tank 60 ... auxiliary drainage device 61 ... filter 62 ... shielding plate 63 ... cylinder 64 ... water collecting tank

Claims (6)

A turbid water solid-liquid separation device that mixes flocculated water with turbid water and combines the turbid water flocculation reaction process and drainage work,
A combined tank for supplying muddy water;
A flocculant supply device for supplying the flocculant into the combined tank;
A drainage device disposed on a part of the side surface of the combined use tank,
Purified water that has been agglomerated in the combined tank and separated into agglomerated solidified product and solid-liquid is configured to drain out of the tank through the drainage device,
Muddy water solid-liquid separator.   The turbid water solid-liquid separator according to claim 1, further comprising a stirrer for stirring the combined tank.   The solid-liquid separator for muddy water according to claim 1 or 2, wherein a drainage device is additionally provided in a part of the combined use tank.   The drainage device comprises a rotating shaft pivotally supported so as to be rotatable in the horizontal direction of the combined tank, a plurality of rotating plates fitted and integrated with the rotating shaft, and a screen interposed between the rotating plates, The turbid water solid-liquid separation device according to claim 3, wherein the turbid water solid-liquid separation device is constructed by being incorporated in a window hole opened on one side of the combined use tank while maintaining water-stopping properties.   5. The structure according to claim 3, wherein a shielding plate capable of closing the window hole is provided inside the dual-purpose tank of the drainage device, and the window hole can be opened and closed by sliding the shielding plate. The turbid water solid-liquid separator described. The solid-liquid separator for muddy water according to any one of claims 1 to 5, wherein an auxiliary drainage device is additionally provided in a part of the combined use tank.

Images