JPH0236314B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an upflow type moving bed adsorption device used for human waste treatment and tertiary treatment of industrial wastewater, etc. The present invention relates to an upflow type moving bed adsorption device capable of quantitatively extracting a chemical agent.

[Conventional technology and its problems]

A conventional upflow type moving bed adsorption device is shown in FIG. The apparatus is composed of an adsorption tower 2, an activated carbon extraction valve 4, an activated carbon extraction nozzle 8, and an activated carbon transfer device 5. The purpose of this device is to fill the activated carbon 2 up to the inside of the triangular pyramid part 3 at the bottom of the adsorption tower to remove target substances from the raw water. This operation is performed by drawing raw water from the bottom of the adsorption tower and passing it upward, that is, in an upward flow. When this operation is repeated several times, the adsorption capacity of activated carbon decreases and disappears. Therefore, it becomes necessary to replace activated carbon whose adsorption capacity has decreased with new activated carbon which has adsorption capacity. Activated carbon in this device can be taken out by attaching several activated carbon extraction nozzles to the triangular pyramidal portion, providing several activated carbon extraction valves on the nozzles, and opening the valves only for the required time. In this type of device, a drop-out phenomenon occurs centered around the nozzle, that is, a phenomenon in which only the activated carbon in the upper portion of the nozzle falls off, resulting in a portion where the activated carbon does not move at all. Therefore,
Activated carbon cannot be taken out evenly from the entire adsorption tower. As a result, even if new activated carbon is supplied, the activated carbon adsorption layer may become non-uniform.

FIG. 4 shows a fluidized bed type multi-stage solid-liquid contact device disclosed in Japanese Patent Application Laid-Open No. 53-42316. The adsorption tower of the apparatus consists of multistage adsorption beds partitioned by support plates 4', and these adsorption beds are connected by overflow pipes 3'. Activated carbon is usually removed from the apparatus while raw water is passed through the contact layer of each stage in an upward flow. The contact layer fluidizes and expands. When activated carbon is introduced from the activated carbon input port 8', the layer expands further, and the expanded activated carbon overflows into the provided overflow pipe, moves to the lower stages, and is finally taken out through the lowest stage draw-out pipe 5'. be done. In this device, only when new activated carbon with adsorption capacity is introduced from the top of the device, the activated carbon in the contact layer expands and passes through the overflow pipe to the lower stages and can be taken out from the bottom stage. Therefore, activated carbon cannot be taken out unless new activated carbon is introduced.

[Means for solving problems]

According to this invention, the raw water is passed in an upward flow through the adsorbent layer packed in the adsorption tower, so that the substances to be adsorbed in the raw water are adsorbed onto the adsorbent, and the treated raw water is transferred to the adsorption tower. An upflow moving bed adsorption device is provided for discharging from the top of the column. In this device, the adsorbent layer is a support plate installed so that a raw water inflow space is formed between it and the bottom of the adsorption tower, and when the water is flowing upward, the adsorbent layer is not allowed to pass through, and the water flowing downward is not allowed to pass through. Sometimes it is supported by a support plate through which the adsorbent passes. Further, a constant flow valve for controlling the flow rate of the downwardly flowing water to a constant level is installed in the raw water conduit passage provided in communication with the inflow space. In this way, the amount of the adsorbent taken out during the downward flow of water becomes uniform.

[Function] With the above-mentioned device, it is possible to simply apply a downward flow to the adsorbent layer without having to supply the adsorbent from the top of the adsorption tower.
Activated carbon can be dropped quantitatively and uniformly from the entire adsorption tower.

〔Example〕

Hereinafter, this invention will be explained in detail with reference to FIG. As shown in the figure, the upflow moving bed adsorption apparatus of the present invention includes an adsorption tower 11 filled with an adsorbent, such as granular activated carbon 12. This adsorption tower 11
The bottom part of the activated carbon 12 forms an inverted triangular pyramid, and the layer of activated carbon 12 is supported on a support plate 14 installed at the top of the inverted triangular pyramid part 13 across the entire inside of the adsorption tower. This support plate 14 does not allow the activated carbon to pass through when water is flowing upward to the activated carbon 12;
The activated carbon 12 is passed through when water flows downward, and can be made of, for example, a perforated plate or a shaped steel. The inverted triangular pyramid portion 13 constitutes an inflow space for raw water, and an inflow space for downward flow and activated carbon when water flows downward.

Almost directly below the support plate 14 installed in the adsorption tower 11, there is a raw water tank for flowing the raw water in the raw water tank 19 as an upward flow to the layer of activated carbon 12 via the line L1 by the pump 18. An introduction port 16 is provided.

The raw water that has been passed through the layer of activated carbon 12 as an upward flow and treated (that is, the adsorbed substances are adsorbed and removed by the activated carbon) is taken out from the top of the adsorption tower 11 via line L0. .

A constant flow valve 25 for controlling the flow rate of the downward flow at a constant level is installed in the middle of the line L1 via the line L2, and a drain valve 2 is installed on the downstream side thereof.
0 is installed, and the water derived therefrom is discharged to the raw water tank 19.

Now, an activated carbon transfer device 15 (for example, an ejector) is installed at the lower end of the inverted triangular pyramid section 13 of the adsorption tower 11 via a line L3. This transfer device is connected to the waste coal tank 21 via line L4.

Further, above the adsorption tower 11, a metering/washing tank 24 for fresh activated carbon is provided. This tank 24 is connected to a new activated carbon tank (new carbon tank) 22 via another activated carbon transfer device 23 and a line L5. New activated carbon transferred from the tank 22 by the transfer device is measured and washed in the tank 24, and then a predetermined amount is replenished into the adsorption tower 11.

In the adsorption operation, first, the pump 18 is driven, and raw water is passed from the raw water tank 19 into the adsorption tower 11 as an upward flow through the line L1. When the raw water passes through the layer of activated carbon 12 in an upward flow, the substances to be removed are adsorbed by the activated carbon 12, and the treated raw water is taken out via line L0. When such adsorption operations are repeated, the adsorption capacity of activated carbon decreases or disappears. In order to take out such activated carbon, that is, waste carbon, the drive of the pump 18 is stopped, the constant flow valve 25 is operated, and the drain valve 20 is opened. A constant flow valve 25 controls the downward flow rate for water removal so that waste coal flows from the adsorption tower 11 to the support plate 14.
Set it to a constant value so that it passes uniformly. In this state, the drain valve 20 is opened until a desired amount of waste coal passes through the support plate 14 and falls into the inverted triangular pyramid section 13 of the adsorption tower. At this time, a nozzle having a diameter smaller than the particle size of the activated carbon is installed in the raw water inlet 16 so that the waste coal does not flow into the raw water tank 19 through the line L1.

When the desired amount of waste coal is deposited in the inverted triangular pyramid 13,
The drain valve 20 is closed, water is allowed to flow downward again, and the transfer device 15 is driven to transfer the waste coal to the line L3.
And it is deposited in the waste coal tank 21 via line L4.

At the same time, new activated carbon is transferred from the new coal tank 22 by the transfer device 23 via the line L5 to the weighing/washing tank 24, and from there, new coal of the same amount as the removed waste coal is weighed and washed. and introduced into the adsorption tower 11 from the top of the tower. Thereafter, the adsorption operation described above is repeated.

Note that it is convenient to prepare a calibration curve as shown in FIG. 2, which determines the relationship between the water draining time when taking out the waste coal and the amount of waste coal that falls from the support plate. Thereby, the amount of waste coal to be taken out can be controlled to be constant by controlling the flow rate of the downward flow and the draining time. For example, in order to take out 410 liters of waste coal from the adsorption tower 11, water may be drained for 17 seconds.

〔Effect of the invention〕

According to this invention, in the adsorption tower, by uniformly generating a downward flow of adsorbent from the entire adsorption tower, and by keeping the downward flow rate (water removal) constant with a constant flow valve. , the adsorbent can be taken out uniformly from the entire interior of the adsorption tower without disturbing the adsorption layer of the adsorbent on the support plate within the adsorption tower.

[Brief explanation of drawings]

FIG. 1 shows an upflow moving bed adsorption apparatus of the present invention. FIG. 2 shows a calibration curve for determining the relationship between water removal time and the amount of activated carbon that falls in this invention. Third
The figure shows a conventional upflow type moving bed adsorption device. Fourth
The figure shows a fluidized bed type multistage solid-liquid contact device disclosed in JP-A No. 53-42316. 11... Adsorption tower, 12... Adsorbent, 14... Support plate, 25... Metering valve.

Claims (1)

[Claims] 1. Raw water is passed in an upward flow through an adsorbent layer packed in an adsorption tower to adsorb substances to be adsorbed in the raw water to the adsorbent, and the treated raw water is drawn out from the top of the adsorption tower. In an upflow type moving bed adsorption device for the purpose of The supporting plate for passing the adsorbent includes an upper plate in which the shaped steels are arranged at appropriate intervals with their grooves facing downwards, and grooves for receiving the adsorbent falling from between the shaped steels of this upper plate facing upwards. The adsorbent layer is supported on a support plate consisting of a lower plate made of shaped steel arranged at An upward flow type moving bed adsorption system, characterized in that the amount of the adsorbent taken out is uniformly controlled by controlling the flow rate of the downward flow using the constant flow valve. Device.