JPH0760241A - Activated carbon-using adsorption apparatus - Google Patents

Abstract

PURPOSE:To provide an activated carbon-using adsorption apparatus whose waste water treatment function is improved by surely carrying out discharge and exchange of old activated carbon while putting the advanced points of a treatment liquid-uptaking type activated carbon-using adsorption tower and a multistage type adsorption tower to practical use. CONSTITUTION:In an activated carbon-using apparatus wherein three or more treatment liquid-uptaking type activated carbon-using towers 2-5 are installed and among them at least two towers are arranged in series and the rest of the towers are used as spare towers, when the adsorption power of the activated carbon of a first tower 2 arranged in series lowers, the supply of raw water is switched to a second tower 3 to use the second tower 3 as a first tower and a spare tower 5 is used as a final tower arranged in a series. The activated carbon is discharged from the lower part of the initially first tower 2 and new charcoal from a activated carbon supplying apparatus 22 is exchanged with the previous carbon to make the first tower as a spare tower and those processes are successively repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment apparatus and an industrial wastewater treatment apparatus, and more particularly to an activated carbon adsorption apparatus used in a night soil treatment apparatus.

[0002]

2. Description of the Related Art As an activated carbon adsorbing device for treating sewage of this type, conventionally, an upflow type activated carbon adsorbing tower for treating liquid as shown in FIG. 2 has been used as a treating device for easily replenishing and withdrawing activated carbon. However, since this is used in only one tower, there are many cases in which a water passage is formed in the activated carbon during the treatment, causing a short circuit of water, and it is possible to fully utilize the adsorption performance of activated carbon. Therefore, there was a possibility that a problem that sufficient treated water quality could not be secured could occur. Generally, the quality of the adsorbed water of activated carbon depends on the filling height of activated carbon. For example, in the case of 3 m packed and 1.5 m packed towers connected in series, the latter is often superior in water quality. . This is because water passages are formed in the filled activated carbon as described above, and it is considered that the risk of water passages being formed can be dispersed in the multi-tower type rather than in the one-tower type. is there. For this reason, it has been proposed that the activated carbon adsorbents are vertically stacked in multiple stages and that the treated adsorption towers are horizontally stacked in multiple stages. An example of a treatment adsorption tower in which the height of the apparatus is lowered by horizontally arranging the adsorption tower is disclosed in, for example, JP-A-3-137905.
In this example, in the upflow type activated carbon adsorption tower of the treatment liquid, the raw water as the treatment liquid is made to flow from the bottom to the top, the old activated carbon is partially withdrawn from the bottom, and new activated carbon is supplied from the top. By connecting the lower part of the multi-stage adsorption tower with a communication pipe and opening and closing the valve installed in the communication pipe, the activated carbon can be sequentially transferred to the raw water supply side so that the adsorption capacity of the activated carbon can be fully utilized. It is the one.

[0003]

However, in the above example, in order to transfer the activated carbon through the connecting pipe to the raw water supply side (upstream side), it depends on the water pressure in each adsorption tower and the liquid in the tower. Therefore, in order to sufficiently discharge or transfer the old saturated adsorptive activated carbon, there is a margin in the water depth in the tower. I had to anticipate. Further, since it is configured to transfer between the adsorption towers by a connecting pipe for transferring activated carbon, it is necessary to provide a connecting pipe for transferring activated carbon in addition to a piping system for supplying the treatment liquid. It is difficult to say that a sufficient processing capacity can be ensured because the adsorption capacity of activated carbon is utilized by making it complicated and by reusing the activated carbon on the downstream side to the upstream side. The present invention solves the problems in the conventional apparatus as described above, and in the activated carbon adsorbing apparatus in which activated carbon whose adsorbing capacity deteriorates is discharged from below by fully utilizing the advantages of the treated liquid upflow activated carbon adsorbing tower. By improving the piping of the treatment liquid supply system, the treatment capacity can be sufficiently enhanced by realizing the reliable discharge of old activated carbon in the multistage adsorption tower with a simple structure.

[0004]

Therefore, according to the present invention, three or more treated liquid upflow activated carbon adsorption columns are arranged, at least two of them are arranged in series, and the remaining columns are used as preliminary columns. In the activated carbon adsorbing device, the first arranged in series
When the adsorption capacity of the activated carbon of the tower decreases, the supply of raw water is switched to the second tower, the second tower is used as the first tower, and the preliminary tower is used as the final tower in series, and at the beginning The activated carbon in the first tower is discharged from below and replaced with new coal to form a preliminary tower, and this operation is sequentially repeated. This is a means for solving the problem.

[0005]

In the present invention, by selectively opening and closing the valve, raw water, which is the treatment liquid, flows into the treatment liquid upward flow activated carbon adsorption tower from the lower part of the first tower, flows out through the overflow, and flows into the lower part of the second tower. . Similarly, the treatment liquid flows into the lower portion of the third tower from the upper portion of the second tower and overflows to become treated water.
The fourth tower is a reserve tower. When the adsorption capacity of the activated carbon of the first tower is lowered, the valve is closed to stop the treatment of the first tower and start the treatment by the fourth tower, and the other valves are opened to open the second to fourth towers. Connect in series and pass water from the second tower. After that, the valve at the bottom of the first tower is opened to remove the old activated carbon, and new carbon is replenished by the activated carbon supply device. Similarly, when sequentially replacing the activated carbon of the second tower, the adsorption tower used should be the third
The raw water is made to flow in the order of the tower, the fourth tower, and the first tower. When the activated carbon of the third tower is replaced, the raw water is made to flow in the order of the fourth tower, the first tower, and the second tower, and this operation is repeated. In this way, by adopting the so-called merry-go-round system in which one of the multi-stage adsorption towers is successively used as a preliminary tower, it is possible to reliably discharge old saturated adsorptive activated carbon only in the adsorption tower and replace it with new activated carbon. It becomes possible, and by fully utilizing the characteristics of the upflow type activated carbon adsorption tower of the treatment liquid, it can be discharged from the old lower activated carbon, and in combination with the advantage of the multi-stage adsorption tower, sufficient wastewater treatment capacity. Can be demonstrated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIG. 1 shows an example of a four-column type apparatus according to the present invention. 5 are arranged in multiple stages in the lateral direction, of which the first to third towers 2 to 4 are arranged in series in the flow of the raw water 1 which is the treatment liquid, and the remaining fourth tower 5 is used as a preliminary tower. It is a thing. Raw water 1
In the lower part of each adsorption tower, a supply pipe provided with valves 6 to 9 selectively opened when receiving the supply of the raw water 1 is connected to each adsorption tower, and each adsorption tower is a first tower. When it functions as, it opens its own valve. Further, the lower part of each adsorption tower on the upstream side of the flow of the raw water 1 is piped so as to receive the supply of the processing liquid overflowing from the upper part of the upstream adsorption tower, and the supply via the valves 6-9 is provided. Connected to the pipe. Valves 14 to 17 are respectively provided in the pipes and are normally opened for the treatment of the multistage serial column of the treatment liquid. However, when the adsorption column functions as the first column, Since the adsorption tower upstream of the adsorption tower is a preliminary tower, the corresponding valve is closed and the processing liquid from the upstream does not flow in.

Next, the treated water 23 is branched from the supply pipe in which each of the valves 14 to 17 is interposed from the pipe that overflows from the upper part of each adsorption tower and flows the processing liquid to the downstream adsorption tower.
The valves connected to the piping system of
13 is provided. These valves 11 to 13 are opened only when the corresponding adsorption tower is the final tower (one before the preliminary tower) of the treatment. Further, valves 18 to 21 for discharging old saturated adsorptive activated carbon are provided at the bottom of each adsorption tower, and an activated carbon adsorption device 22 for supplying new activated carbon to each adsorption tower is provided above. It is arranged.

In the above structure, the valves 6-1
By selectively opening and closing 7, the raw water 1 as the treatment liquid flows in from the lower part of the first upflow type activated carbon adsorption tower 1 for the treatment liquid, flows out by overflow, and flows into the lower part of the second tower 3. Similarly, the treatment liquid flows from the upper part of the second tower 3 into the lower part of the third tower 4 and flows out by overflow to become treated water 23. 4th tower 5
Is a reserve tower. When the adsorption capacity of the activated carbon of the first tower 2 decreases, the valves of 6, 12, 15 are closed to stop the treatment of the first tower 2 and start the treatment of the fourth tower 5,
The valves 3 and 17 are opened to connect the second to fourth towers 3, 4 and 5 in series, and water is passed from the second tower. Then the first tower 2
The valve 18 in the lower part of the column is opened to remove old activated carbon, and new carbon is replenished by the activated carbon supply device 22. Similarly, when sequentially replacing the activated carbon of the second tower, the adsorption tower used should be the third
The raw water is made to flow in the order of the tower, the fourth tower, and the first tower. When the activated carbon of the third tower is replaced, the raw water is made to flow in the order of the fourth tower, the first tower, and the second tower, and this operation is repeated.

[0009]

As described in detail above, according to the present invention, compared with the case where the treatment liquid is carried out by one upflow type activated carbon adsorption tower, the height of the apparatus is small, and a plurality of towers are used for treatment in series. It is possible not only to prevent the short circuit phenomenon of water due to formation but also to stabilize the water quality, but since deteriorated activated carbon is exchanged for each tower, it is not necessary to transfer activated carbon from one tower to another. Easy to operate. Moreover, by adopting the so-called merry-go-round system, in which one of the multi-stage adsorption towers is sequentially used as a preliminary tower, it is possible to reliably discharge the old saturated adsorptive activated carbon and replace it with new activated carbon. It becomes possible, and by fully utilizing the characteristics of the upflow type activated carbon adsorption tower of the treatment liquid, it can be discharged from the old lower activated carbon, and in combination with the advantage of the multi-stage adsorption tower, sufficient wastewater treatment capacity. Can be demonstrated.

[Brief description of drawings]

FIG. 1 is a system diagram of an activated carbon adsorption device according to an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional single-tower processing apparatus.

[Explanation of symbols]

 1 Raw water 2 Treatment liquid upward flow activated carbon adsorption tower 1st tower 3 Treatment liquid upward flow activated carbon adsorption tower 2nd tower 4 Treatment liquid upward flow activated carbon adsorption tower 3rd tower 5 Treatment liquid upward flow activated carbon adsorption Tower 4th tower 6-21 Valve 22 Activated carbon supply device 23 Treated water

Claims (1)

[Claims] 1. An activated carbon adsorption device in which three or more treated liquid upflow type activated carbon adsorption columns are arranged, at least two columns of which are arranged in series, and the remaining columns are used as spare columns.
When the adsorption capacity of the activated carbon in the first tower arranged in series decreases, the supply of raw water is switched to the second tower, and the second tower is set to the first tower.
It is used as a tower, and a spare tower is used as the final tower in series, and the first activated carbon of the first tower is discharged from below and replaced with fresh coal to make a spare tower, and this operation is repeated in sequence. An activated carbon adsorption device characterized in that