JP4915054B2 - Organic wastewater treatment equipment - Google Patents

Description

  The present invention relates to an organic wastewater treatment apparatus, and more particularly to a treatment apparatus using activated carbon.

  The wastewater treatment method using the adsorption action of activated carbon is widely used as the simplest treatment method for removing various dissolved pollutants in the wastewater.

  Conventionally, an adsorption tower using such activated carbon has been used as an advanced treatment facility after removing SS (suspended material) with a filtration device in a general wastewater treatment system (for example, Patent Document 1). reference). SS (Suspended Solid) is a term generally used in the technical field, and is a general term for substances that float in water and do not dissolve, for example, expressed in dry weight (mg) in 1 L. The

  In addition, when wastewater containing organic pollutants is treated under aerobic conditions, microorganisms grow on the surface of activated carbon, and the pollutant adsorption action by activated carbon and the oxidative decomposition action of adsorbed organic substances by the settled microorganisms The activity of activated carbon is regenerated by microorganisms and is maintained for a long time. This phenomenon is known as the biological regeneration action of activated carbon.

  As a wastewater treatment device that utilizes the bioregenerative action of this activated carbon, for example, granular activated carbon is packed in layers and used as an adsorption tower. An apparatus for maintaining a fluidized state has been put into practical use.

  In this way, when the water is passed in an upward flow, the grown and grown epiphytic microorganisms may be detached from the activated carbon and mixed with the treated water and discharged. For this reason, a processing method is also proposed in which the order of the above steps is reversed and a filtration step is performed after the adsorption step (see, for example, Patent Document 2).

  This treatment method is a water purification treatment method in which water is passed through a granular activated carbon layer in an upward flow, and after rapid addition of chlorine, rapid filtration is performed, particularly for trihalomethanes.

  As a wastewater treatment apparatus, an apparatus that uses a carrier such as activated carbon and performs filtration after treatment has been proposed (for example, see Patent Document 3), although it is not a complete upward flow.

  In the device described in Patent Document 3, a carrier such as activated carbon to which microorganisms can adhere is placed in an aeration tank constituting an upward flow path, and the three layers of waste water, carrier, and air are in close contact. It rises while repeating. The carrier is maintained in a fluid state, and the carrier that has adsorbed the processed material is regenerated by microorganisms (biological regeneration action).

  This treated water is introduced into the next-stage filtration device through a pipe. For the filtration, a filter cloth (microscreen) whose mesh opening is smaller than the suspension in the treated water is used. This filter cloth is wound around a filter cylinder and rotated by a motor and a speed reducer.

  The treated water is filtered with a filter cloth from the inside of the filter tube, enters the outlet chamber, and is discharged from here. A cleaning nozzle is disposed above the filter cylinder, and a cleaning fluid is sprayed from the nozzle onto the filter cloth to clean the filter cloth surface.

The feature of this apparatus is that the quality of filtered water can be improved without using a water treatment agent such as a flocculant.
Japanese Unexamined Patent Publication No. 53-49854 Japanese Patent Laid-Open No. 61-245887 JP-A-53-87568

  However, such a wastewater treatment apparatus has a problem that since the opening is made small, the drive becomes necessary and the apparatus becomes complicated, and the frequency of washing the filter cloth increases to prevent clogging. It was.

  Moreover, the removal of the black powder generated due to the contact between the activated carbons is not taken into consideration, and in order to remove it, the opening of the screen must be made smaller, and the above problem becomes larger. was there.

  Then, an object of this invention is to provide the organic waste water treatment apparatus which implement | achieves the improvement of a treated water with a simple apparatus.

In order to achieve the above object, the organic waste water treatment apparatus of the present invention includes an upward activated carbon tower that is filled with activated carbon and allows waste water to flow upward, and an upward activated carbon tower. a coagulant adding means for adding a flocculant to the treated wastewater, seen including a coagulation filter to the added raw wastewater the flocculant is filtered process, precipitated and removed metal or organic substances contained in the waste water released A settling tank is arranged upstream of the upward flow activated carbon tower, an overflow tank is provided around the upper part of the precipitation tank, and a lower part of the overflow tank and a lower part of the upward activated carbon tower are piped. It connects and it is set as the structure which made the water level of the said upward flow type activated carbon tower lower than the water level of the said precipitation tank .

With this configuration, the particle size of the discharged suspended solids from upflow activated carbon column by addition of the agent is increased, in aggregate filter of simple structure, you can remove the suspended matter, also, upward The wastewater introduced into the flow activated carbon tower contains a large amount of dissolved oxygen. Therefore, inside the upward flow activated carbon tower, aerobic microorganisms tend to settle on the surface of the activated carbon. contained in the wastewater, organic matter adsorbed by the activated carbon is oxidized and decomposed, thus, the biological regeneration action of the activated carbon, extraction of activated carbon need not be reproduced, Ru can extend the life of the activated carbon.

As described above, according to the organic waste water treatment apparatus of the present invention, the waste water introduced into the upward flow activated carbon tower contains a large amount of dissolved oxygen . The discharged black powder can be removed while utilizing the biological regeneration action. That is, the life of the activated charcoal is extended and the quality of the treated water is improved.

The organic waste water treatment apparatus of the present invention is filled with activated carbon inside, and an upward flow type activated carbon tower for passing the waste water in an upward flow, and a coagulant in the treated waste water treated by the upward flow type activated carbon tower. a coagulant adding means for adding the additives were treated wastewater coagulants saw including a flocculation filter for filtering process, a sedimentation tank of the open precipitating and removing the metal or organic substances contained in the waste water the upward Arranged upstream of the flow activated carbon tower, provided an overflow tank around the upper part of the settling tank, piped the lower part of the overflow tank and the lower part of the upward flow activated carbon tower, the water level of the precipitation tank Furthermore, it is set as the structure which made the water level of the said upward flow type activated carbon tower low . The wastewater introduced into the upward flow activated carbon tower contains a large amount of dissolved oxygen, and therefore, the aerobic microorganisms tend to settle on the surface of the activated carbon inside the upward flow activated carbon tower. As a result, the organic matter adsorbed on the activated carbon contained in the wastewater is oxidatively decomposed. Thus, it is not necessary to take out and regenerate the activated carbon by the bioregenerative action of the activated carbon, thereby extending the life of the activated carbon. In addition, the addition of the flocculant can also remove fine particles of black powder with a conventional flocculant filter. Moreover, since there is a settling tank in the previous stage, the processing load of the upward flow activated carbon tower can be reduced. Further, the discharged water from the settling tank can be discharged to the outlet of the upward flow activated carbon tower without using the power source of the pump tower.

  Moreover, it is preferable that the organic waste water treatment apparatus of this invention is equipped with the rectification | straightening means which makes the flow of waste water uniform in the inside of an upward flow type activated carbon tower. By making the flow of the waste water in the tower uniform by this rectifying means, the contact efficiency between the waste water and the activated carbon can be improved, and the outflow of the activated carbon can be prevented.

  Moreover, it is preferable that the organic waste water treatment apparatus of this invention is equipped with the stirring means by air in the lower part in an upward flow type activated carbon tower. By stirring the inside of the activated carbon tower with this stirring means, it is possible to prevent epiphytic microorganisms that have grown on the surface of the activated carbon and have peeled off from accumulating in the lower part.

In the organic waste water treatment apparatus of the present invention, the coagulation filter is preferably an upward flow type.
The upward flow type has a longer filtration time than the downward flow type, and can improve the filtration efficiency.

  Moreover, it is preferable that the organic waste water treatment apparatus of this invention is equipped with the washing | cleaning means in which a coagulation filter wash | cleans a filter medium. Filtration efficiency can be maintained by timely washing with this washing means.

  Hereinafter, the organic wastewater treatment apparatus of the present invention will be described by way of example, but the present invention is not limited to this.

Example 1
In FIG. 1, an upward flow type activated carbon tower 1 includes an activated carbon 2, a rectifying means (baffle plate) 3, and a stirring means 4 inside, and waste water is introduced from the lower part and discharged from the upper part. In contact. The treated wastewater discharged from the upward flow activated carbon tower 1 passes through the pipe 5 and is introduced into the aggregation filter 6. The treated wastewater is added with a flocculant by the flocculant adding means 7 in the middle of the pipe 5, and the SS in the treated wastewater is removed by the flocculant filter 6. A cleaning means 8 is provided in the upper part of the coagulation filter 6 and cleans and regenerates the filter medium such as sand. Granular particles are generally used as the activated carbon 2, but a molded product of fibrous activated carbon can also be used. As the flocculant, PAC (polyaluminum chloride) or sulfuric acid band can be used.

  In the above configuration, the wastewater introduced into the upward flow activated carbon tower 1 contains a large amount of dissolved oxygen because the precipitation tank in the previous step is an open type. Therefore, aerobic microorganisms tend to settle on the surface of the activated carbon 2 inside the upward flow activated carbon tower 1. By these microorganisms, the organic matter adsorbed on the activated carbon 2 contained in the waste water is oxidatively decomposed. As described above, the activated carbon 2 need not be taken out and regenerated by the bioregenerative action of the activated carbon 2, and the life of the activated carbon 2 can be extended.

  At this time, in order to make the activated carbon 2 into a fluid state in an upward flow, black powder is generated by contact and rubbing between the activated carbons 2. In order to remove the black powder, the effect of adding a flocculant will be described using data obtained by experiment.

  First, when sand was used as the filter medium, the weight average diameter was 1.97 μm. Next, even when anthracite finer than sand was used as a filter medium, the weight average diameter was 1.42 μm. And when the coagulant | flocculant is used together with the sand filter medium of a present Example, it becomes a weight average diameter of 0.62 micrometer, The effect of the coagulant | flocculant is about 1/3 in a weight average diameter, and it can be said that filtration efficiency is about 3 times. . Here, the weight average diameter is a diameter of particles that is a weight average obtained from a weight distribution, and is a particle diameter that is usually used when evaluating filtration performance.

  Thus, while being able to utilize the bioregenerative action of the activated carbon by the upward flow, and by adding a flocculant before filtration, finer particles of black powder can be removed by filtration, the quality of filtered water is improved.

(Example 2)
In FIG. 2, a settling tank 9 is connected to a front stage of the upward flow activated carbon tower 1 through a pipe 10. Further, an overflow tank 11 is provided around the upper part of the precipitation tank 9, and a pipe 10 connects the lower part of the overflow tank 11 and the lower part of the upward flow activated carbon tower 1, and the precipitation tank 9 and the upward flow type are connected. The vertical positional relationship of the activated carbon tower 1 is set such that the water level in the settling tank 9 is higher by “h” than the water level in the upward flow activated carbon tower 1.

  In the above configuration, since the water level in the precipitation tank 9 is set to be “h” higher than the water level in the upward flow activated carbon tower 1, this “h” becomes a head difference (water head difference). The wastewater that has overflowed the water naturally passes through the pipe 10 from the overflow tank 11, flows into the upward flow activated carbon tower 1, and also passes through the upward flow activated carbon tower 1 in the upward flow to the pipe 5. leak.

  In this way, since water can be sent from the settling tank 9 to the upward flow activated carbon tower 1 without using power such as a pump, energy saving can be achieved.

As described above, according to the organic wastewater treatment apparatus of the present invention, the wastewater introduced into the upward flow activated carbon tower contains a large amount of dissolved oxygen, and can utilize the biological regeneration action of activated carbon. Since the quality of filtered water can be improved, it can be widely used in wastewater treatment methods using activated carbon.

The block diagram which shows Example 1 of this invention The block diagram which shows Example 2 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upward flow type activated carbon tower 2 Activated carbon 3 Rectification means 4 Agitation means 5,10 Piping 6 Coagulation filter 7 Coagulant addition means 8 Washing means 9 Settling tank 11 Overflow tank

Claims (5)

An up-flow type activated carbon tower that is filled with activated carbon and passes the waste water in an upward flow;
A flocculant addition means for adding a flocculant to the treated wastewater treated by the upward flow activated carbon tower;
Look including a flocculation filtration unit for filtration of wastewater with the addition of the flocculant, the settling tank of the open precipitating and removing the metal or organic matter contained in the wastewater upstream of the upflow activated carbon column An overflow tank is provided around the upper part of the settling tank, a lower part of the overflow tank and a lower part of the upward flow activated carbon tower are connected by piping, and the upward flow activated carbon tower from the water level of the precipitation tank Organic wastewater treatment equipment with low water level . The organic waste water treatment apparatus according to claim 1, wherein the upward flow activated carbon tower is provided with a rectifying means for making the flow of waste water uniform. The organic waste water treatment apparatus according to claim 1, wherein the upward flow activated carbon tower is provided with a stirring means by air. The organic wastewater treatment apparatus according to claim 1, wherein the coagulation filter allows wastewater to flow in an upward flow. The organic waste water treatment apparatus according to claim 1, wherein the aggregation filter includes a cleaning unit that cleans the filter medium.

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