JPS594798Y2 - Sludge freeze-thaw treatment tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a freeze-thaw tank used for freeze-thaw treatment of sludge.

Drainage water generated from water treatment plants, colloidal industrial wastewater, etc. contain sludge that is difficult to dewater, and the freeze-thaw method is effective for dehydrating this type of sludge water.

As shown in Fig. 1, the freeze-thaw tank that performs the freeze-thaw treatment of sludge water has a water injection pipe 1 for treated sludge water, a washing water injection pipe 2, etc. facing the top of the tank, and a part of the lowest bottom surface 3. A tank body 6 having an opening 4 for discharging treated sludge water and whose inner surface is lined with a heat insulating layer 5 of a required thickness, and a pair of headers 71 and 72.
A large number of flexible pipes 8 having the same shape are arranged to communicate with each other and meander up and down to match the cross-sectional internal contour of the tank body 6.

82...8n, and an on-off valve 9 attached to the tank body 6 at the discharge opening 4. The treated sludge water is batch treated in cycles of 2 to 3 hours, depending on the tank capacity.

That is, the sludge water to be treated is frozen by passing cooling brine through the group of corrugated pipes 8, and then thawed by passing through the heating brine to become treated sludge water, which is then sent to the next process by opening the on-off valve 9.

The sludge components of the treated sludge water are granulated and reformed to become sand-like, so the vacuum dehydrator 21 guides the water to a receiving tank 23 equipped with a filter cloth 22 as shown in FIG. 4 and sucks it with a vacuum unit 24.
It can be easily dehydrated.

The opening/closing valve 9 for discharging treated sludge water may be a single-opening or double-opening lid valve that is opened and closed by an air cylinder via a non-closing mechanism. In addition to causing poor cleaning due to the accumulation of sludge, various devices in the vicinity of the discharge opening 4, including the link mechanism and the air cylinder, are contaminated by the sludge water, resulting in disadvantages in terms of maintenance.

Furthermore, if a ball valve or a slide valve is used as the on-off valve 9, the drawbacks of a closed-off lid valve can be eliminated; however, if a normal slide valve is used, for example, the connecting pipe is attached to the valve case 12 as shown in FIG. 16, there is a portion 10 between the closing surface 14 of the valve plate 13 and the lowest bottom surface 3 of the tank body 6 that is not affected by the freezing action of the corrugated pipe group 8 within a predetermined processing cycle time. The sludge water to be treated is an unfrozen portion and is difficult to dewater, which poses a major obstacle in the vacuum dewatering operation in the next step.

During actual operation, if there is only 11 parts of untreated sludge water per 1.3 m of batch-processed sludge water, a film of untreated sludge water will form in the receiving tank 23 of the vacuum dehydrator, making vacuum suction dewatering difficult. I found out that.

In order to solve the above-mentioned problem, a method was devised in which a part of the flexible pipes of the group of flexible pipes 8 was inserted into the connecting pipe part of the valve case of the on-off valve to eliminate the part 10 that was not affected by the freezing effect.
-34369) has already been proposed, but in this one, the on-off valve is attached to the tank body using a special flexible pipe 8 depending on the position.
The disadvantage is that it must be designed and installed.

The present invention was developed in view of the above-mentioned circumstances, and includes a sliding valve plate having a closing surface as an on-off valve for discharging treated sludge water in a freeze-thaw treatment tank, and a sliding valve plate for opening and closing the valve. A slide valve consisting of a valve case with no connecting pipe part on the side is used to slidably fit and attach to the tank body, and when the slide valve is closed, the closing surface of the valve plate is on the lowest bottom surface of the tank body. It is characterized by being located close to each other.

The sludge freeze-thaw treatment tank of the present invention will be explained in detail below based on the drawings.The tank body, the cedar and the group of flexible pipes thereof are substantially the same as those shown in Fig. 1, but the slide valve is It is characterized by the structure of the valve case and the position occupied by the valve plate closing surface when the valve is closed.

That is, as shown in FIG. 3, 6 is a tank body whose lower part is an isosceles trapezoidal cross section, and the upper part of the tank body 6 has a water injection pipe 1 for treated sludge water, a washing water injection pipe 2, etc. Facing the bottom bottom 3
A part of the tank body 6 has an opening 4 for discharging treated sludge water, and the inner surface of the tank body 6 is lined with a heat insulating layer 5 of a required thickness.

The heat insulating material layer 5 not only performs a heat insulating function during cooling and heating during freeze-thaw processing, but also functions to absorb the volumetric expansion caused by freezing of the sludge water to be treated and prevent damage to the tank. Materials, etc. are in good condition.

Further, a pair of headers 7□, 7° are arranged at the upper part of the tank body 6, and are arranged so as to communicate between both headers 7□, 72 and to match the internal contours of the lining insulation layer 5 and the lowest bottom surface 3. Many meandering pipes 8□, 8□ of the same shape meandering up and down.
. . . A flexible pipe group 8 consisting of 8 o is arranged.

In the figure, for simplicity, a flexible pipe 8n is shown as a representative, but each of these flexible pipes 81, 82...8n all have the same front profile, and the odd-numbered flexible pipes 8□, 83...
. . . and the even-numbered corkscrew tubes 82, 84, etc. are spread over the inside of the tank in a relationship that is shifted by half a pitch laterally, and the lower bottom surface 17 of the corrugated tube group 8 is the lower bottom surface of the tank liquid. Located close to 3.

An on-off valve for discharging treated sludge water is attached to a discharging opening 4 provided in a part of the lower bottom surface 3 of the tank liquid. sliding valve plate 13 with a closing surface 14 to close 4;
and a valve case 12 in which the valve plate 13 is slidably housed, and the closing surface 14 of the valve plate 13 is as close as possible to the bottom surface 17 of the flexible pipe group 8 when the slide valve 11 is closed. It is arranged so that it is located close to.

Note that 15 is a flow path when the valve is open, 18 is a conduit directly connected to the lower part of the slide valve 11 and led to the vacuum dehydrator, 19 is a supporting leg of the tank body 6, and 20 is an opening/closing drive device for the slide valve 11.

Further, the tank body 6 may have a cross-sectional shape with a lower part inclined on one side, as shown in FIG. can be used.

The freezing and thawing treatment tank for sludge water according to the present invention has the above-described structure, and is capable of completely closing the valve by using the slide valve 11, can sufficiently withstand increased internal pressure during freezing, and has the following features: Of course, the slide valve performs its original function in conjunction with the freeze-thaw treatment tank, such as not contaminating the equipment near the discharge opening of the tank, and the valve case 12 of the slide valve 11 is especially designed to avoid contaminating the tank body. The installation is structured so that there is no connecting pipe part on the side, and the closing surface 14 of the sliding valve plate 13 is located close to the bottom surface 17 of the flexible pipe group 8 when the valve plate is closed, so that the sludge water to be treated is There is no unfrozen portion, which does not cause any problem in the vacuum dehydration treatment of treated sludge water after thawing, which greatly contributes to improving treatment efficiency.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front sectional view of a sludge water freeze-thaw treatment tank; Figure 3 is a sectional view of the main parts of the freeze-thaw treatment tank according to the present invention, Figure 4 is a schematic explanatory diagram of a vacuum dehydrator used for post-treatment of treated sludge water, and Figure 5
The figure is a front view showing a deformed shape of the tank body. 1...Sludge water injection pipe to be treated, 2...Washing water injection pipe, 3...Bottom surface of tank liquid, 4...
Discharge opening, 5...Insulating material layer, 6...
Tank body, 71, 72...Header, 8. 8□・・・8n・・・Snake pipe, 8・・・・・・
・Serpentine pipe group, 9... Open/close valve, 10... Portion not affected by freezing action, 11... Slide valve,
12...Valve case, 13...Sliding valve plate, 14...Closing surface, 15...Flow path,
16... Connecting pipe section, 17... Lower bottom surface of snake pipe group, 18... Conduit, 19... Support leg, 20... Valve Opening/closing drive device, 21...
Vacuum dehydrator, 22...Filter cloth, 23...
Receiving tank, 24... Vacuum unit.

Claims (1)

[Scope of utility model registration request] It has a discharge opening in a part of the bottom bottom surface, and communicates between the tank body whose inner surface is lined with a layer of heat insulating material and a set of headers, and meanders up and down to match the cross-sectional internal contour of the tank body. In the treatment tank, the processing tank is equipped with a group of brine brine pipes consisting of a large number of brine pipes of the same shape arranged in such a manner that the brine pipes are arranged in such a manner that the brine pipes are arranged in a manner that
A slide valve consisting of a sliding valve plate and a valve case that slidably accommodates the valve plate for opening and closing the valve and does not have a connecting pipe section on the side that is attached to the tank body, A sludge freeze-thaw treatment tank, characterized in that a sliding valve plate is located close to the lowest bottom surface of the tank body.