WO1980002553A1 - Method of regeneration of activated carbon and apparatus therefor - Google Patents

Abstract

A method of regeneration of activated carbon and an apparatus therefor in which spark discharges are generated among activated carbon particles by the application of pulse voltages to thereby make the desorption of material from the carbon. A great deal of spark discharge may facilitate an efficient desorption of adsorbed material. A temperature control in the desorption process may be done by adjusting the pulse width of the applied voltage so that the useful material may be recovered without being subjected to decomposition, while harmful or useless material may be decomposed or burnt away under high temperature. Further, in continuous regeneration apparatus, in order to carry out more complete desorption, weir means are provided at an appropriate position in oscillating conveyor means to temporarily intercept the activated carbon so that desorbed lighter carbon particles are selectively and sequentially passed over the weir means.

Description

 Specification

 Activated carbon regeneration method and apparatus

Technical field

 The present invention relates to a method and an apparatus for regenerating used activated carbon.

Background art

 Detoxification of wastewater and waste gas discharged from factories and other sources has long been an important issue, but in recent years, especially in recent years when pollution problems have become more severe, the most urgent problem has been It has been rolled up. Although these detoxification treatment methods have been studied individually, treatment using activated carbon occupies a very large proportion in any case.

 Activated carbon has a very high adsorptive power and is a very preferred treatment agent. However, if the adsorp- tion is performed sufficiently, the adsorptive power is saturated, and it is necessary to regenerate it for further use.

Conventionally, activated carbon is activated and regenerated by using activated carbon in a π-talli kiln that is heated externally by burning heavy oil or the like to raise the temperature of the activated carbon to 800 ° C or more to remove adsorbed substances. In addition to carbonization, there is a method of regenerating by water gas reaction by blowing high-temperature steam.However, in order to complete the desired regeneration process, several hours at high temperature Requires considerable heating, requires considerable fuel consumption, requires large equipment costs, and causes significant loss of activated carbon itself.

 In addition, there is a method of using activated carbon itself as a resistor and using Joule heat generated by energization to desorb the adsorbed substance. Because of the need for high current, a large amount of power is required for receiving equipment. One of the inventors of the present invention has conducted research to find a method for regenerating used activated carbon which is efficient and does not require equipment and repair costs.As a result, vibration was first applied to the activated carbon between the electrodes. The present inventors have invented and disclosed an apparatus for regenerating a used activated carbon in which a spark discharge is generated between particles by applying a current while applying power to thereby desorb an adsorbed substance.

(For example, Japanese Patent Application Laid-Open No. 52-6393, Japanese Utility Model Application Laid-Open No. 52-14351, etc.).

 However, even in this method, for example, between particles having a long contact time, current is consumed only for generation of Joule heat and the efficiency is reduced accordingly, and it is difficult to control the temperature. However, there are disadvantages, such as decomposing upon desorption, making recovery impossible.

Disclosure of the invention

 The present invention provides a method for activating and regenerating used activated carbon by the spark discharge.

O PI By applying a pulse voltage between the used activated carbon particles, a spark discharge is generated between the activated carbon particles to desorb the adsorbed substance. In particular, the generation of spark discharge between particles is remarkably increased, and the generation of Joule heat is reduced, so that the adsorbed substance can be efficiently desorbed. Another major advantage is that by adjusting the pulse width, the temperature can be controlled during the desorption process.o

 That is, useful adsorbents can be recovered without decomposing by desorbing at a relatively low temperature, and harmful and unnecessary adsorbing substances can be desorbed at a high temperature and decomposed or burned on the spot. By adding a pulsating motion to the activated carbon particles together with the application of the pulse voltage, the generation of spark discharge and, consequently, the desorption action of the adsorbed substance is promoted. In addition, in the continuous regeneration device, in order to more completely desorb the adsorbed material, a weir plate is provided at an appropriate location in the oscillating activated carbon transport path to temporarily block the flow of the activated carbon and to remove the adsorbed material. Particles that have become lighter due to separation are selectively passed over the crest plate sequentially.

 Next, the details of the present invention will be described with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of the activated carbon regenerating apparatus according to the present invention, FIG. 2 is a side view of the same, FIG. FIG. 5 is a layout diagram showing an example of a wastewater purification device using a regeneration device, and FIG. 5 is a waveform diagram of an applied voltage.

BEST MODE FOR CARRYING OUT THE INVENTION

In FIGS. 1 to 3, (1) is a box-shaped desorption tank whose bottom is inclined at an appropriate angle in the longitudinal direction, and a light caster made by Pli Plico is installed on the inner surface of the bottom. A refractory mortar, such as a plycaster, or other refractory (2) such as a refractory wrench with good greenery is lined to form a groove-shaped transport path (). The plate-like carbon electrodes (3), (3), ... are arranged in opposition to each other, and a rod-like electrode or the like can be used instead of the plate-like electrode. At appropriate places in the transport path W, weir boards (4), (4), ... made of refractory material having good insulation similar to the above-mentioned refractory material (2), are provided at appropriate heights ₍ ( ⁵ ) is the inlet for the used activated carbon, ( ⁵ ') is the net for dehydration, (is the drain, ( ⁶ ) is the port for carrying activated carbon, ( ⁷ ) is the outlet for desorbed gas, (8) Is the terminal of the electrode (3).

The lower end of the inclined bottom surface of the desorption tank (1) is mounted on the eccentric shaft (11 ') of the rotating shaft (11) supported by bearings (10), (10) on the base frame (9). (12), (12), and the rotating shaft (11) is pre-mounted ³ ), belt (M) and

OMPI

I 'Vii'O And a small pre-loader (1 connected to the motor (1). The upper end of the inclined bottom surface is supported by the base frame (9) via the spring (1). First, when the motor ⁶ ) is started, the desorption tank (1) swings up, down, left and right in the transport direction while drawing a roughly circular orbit. ), The activated carbon containing water is dewatered on the receiving net (5 ') and sent to the bottom transport path (1) via the dropper (1¾), and the weir plate ( ⁴ ) (4) ), Travels on the transport path (") while being temporarily blocked, and is taken out of the transport exit (6). At this time, a voltage is applied between the electrodes (3), (3) ... In this case, a pulse voltage E is applied as shown in Fig. 5. The pulse voltage or the pulse voltage and the oscillating motion are combined. As a result, a large amount of spark discharge is generated between the activated carbon particles, and the desorption of the adsorbed substance is performed within a very short time of several to several minutes. One-sided thyristor, thyristor-leonard type, etc. are used (in this embodiment, the thyristor-chopper type was adopted).

Furthermore, a remarkable effect obtained in this case is that the temperature during the desorption process can be controlled by adjusting the pulse width (t). For example, at an applied voltage of 200 to 500 V, a pulse width of 5 to 10 microsec. The substance is not decomposed. <It is desorbed and can be recovered. Also, the oxidation consumption rate of the activated carbon is extremely low, and the consumption of the electrode carbon can be reduced to about ^ 0. If the pulse width is between 1 and 10 mil lisec., The temperature rises to 600 to 700 ° C within a few minutes, so that harmful adsorbed substances are decomposed and burned simultaneously with desorption. Can end. The applied voltage may be an AC waveform as shown in FIG. 5, or a DC waveform without pole conversion.

 The spent activated carbon thus fed is dammed by each dam (4), and the adsorbed substance is desorbed during the repetition of the rocking motion ^ J, and the lightened particles float upward. After crossing the crest plate (4) and being further dammed by the next crevice plate, the evacuation progresses sequentially, and finally, most of the adsorbed substances are desorbed, and the activated carbon that has been almost completely activated and regenerated is transported. Removed from mouth (6).

 The desorption tank (1) having the weir plates (4), (4)... Can be used also in the reproducing apparatus using the normal voltage application and vibration according to the prior invention.

Fig. 4 shows an example of a continuous purification system for wastewater using the activated carbon regeneration device of the present invention. (19) is an adsorption tank using activated carbon (20) as an adsorbent, (21) is a dryer, and (22) is a dryer. The reproducing apparatus according to the present invention, wherein (23) is a reproducing activity A tank for storing charcoal, ( ²⁴ ) is a transport pump, and-a dryer (21) having the same structure as the regenerator ( ²² ) in this example is used, and a dehydrator having a receiving net at the top is used. Although a vessel ( ²⁵ ) is provided, a normal direct heating type or a drying oven using hot air may be used.

To explain the operation of this purification device, the raw water flowing from the raw water intake (26) of the adsorption tank (19) passes through the filter net (27) and the harmful substances while passing through the packed bed of the adsorbent (20). Is removed by adsorption * and discharged from the outlet (28) as purified water. The adsorbed activated carbon (20) is taken out from the outlet at the bottom of the adsorption tank-(29) by the impregnated fixed-quantity sampler (30) in a fixed amount every predetermined time into the dehydrator (23). Is removed and then dried in a drier (), and if necessary, the slag is carbonized or incinerated in this section, and then a regenerator (23). There are removed, (sent in ^2, the conveying pump 4) storing data down click in the reproduced charcoal is returned to the top again adsorption vessel by the (19). Therefore to sequentially repeating these operations, Purification of raw water and regeneration of the adsorbent can be automatically and intermittently performed without stopping the intake of raw water.

 As described above, according to the activated carbon regeneration method of the present invention, by applying a pulse voltage, it is possible to generate a spark discharge between the activated carbon particles and efficiently desorb the adsorbed substance. , And at that time, the applied voltage

fU K f OMPI By adjusting the pulse width, there are excellent advantages such as the possibility of controlling the temperature during the desorption process.In addition, in the continuous regenerating apparatus, a dam is provided in the activated carbon transport path. According to the degree of progress of evacuation, there is an effect that activated carbon particles can be selectively passed through.These combined effects promote desorption of adsorbed substances, and regenerated activated carbon with high activation can be produced in a relatively short time. It has advantages that can be obtained.

In the above example, the pulse width was adjusted without changing the intermittent cycle. Cycle was used in the range of ^{5 0-4} 0 0 rhino click Le.

Claims

The scope of the claims  1. A method for regenerating activated carbon, characterized in that a pulse voltage is applied between used activated carbon particles to cause a spark discharge between the activated carbon particles to desorb adsorbed substances.  2. The method for regenerating activated carbon according to claim 1, wherein the pulse width of the applied voltage is adjustable.  3. The method for regenerating activated carbon according to claim 1 or 2, wherein the activated carbon particles are subjected to a rocking motion.  4. An adsorbent desorption tank having a groove-shaped activated carbon transport path at the bottom, an electrode for applying a spark discharge voltage to the activated carbon particles in the transport path, and a weir provided at an appropriate place in the transport path. An activated carbon regenerating device comprising: a rocking means for rocking the desorption tank; and a device for generating a pulse voltage to be applied to the electrode.  5. The activated carbon regeneration apparatus according to claim 4, wherein the pulse voltage generator is capable of adjusting a pulse width.