JPH0767522B2 - Circulating water treatment equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an over-machine treatment method for a circulating water treatment apparatus, and in particular, for over-machine treatment by performing a relatively simple treatment on the over-machine. The present invention relates to a device capable of capturing even fine particles (suspended components) smaller than the voids of the excess material formed between the particles of the excess material to remarkably improve the overcapacity.

[Prior Art] Generally, in pools, baths, and the like, a circulation type water treatment device is used to purify water in a water reservoir such as a pool.

This circulating water treatment device usually includes an excess machine for trapping contaminant particles in the water to be treated.

Conventionally, this type of so-called sand is formed by stacking coal-based waste materials such as anthracite of several kinds of particle diameters or sands in multiple layers so that pollutant particles of a predetermined size can be captured. A diatomaceous earthmoving machine or the like which is superior in accuracy or more accurate than this was used.

However, by simply using such an equipment, it is not possible to sufficiently purify the water to be treated such as in a pool or a bath where the pollution is severe, and the particles that are not passed by the equipment are concentrated by repeating the circulation and the transparency of The situation has been the same when the user density is high even when the diatomaceous earthmoving machine, which is said to have the highest over-accuracy so far, is used because of the drop in popularity and the user's unpopularity. As described above, in the field such as a pool or a bathhouse, the colloidal substance is recirculated and concentrated without being unnecessarily trapped so that it is clearly visible in the form of a decrease in transparency.

By the way, since this over-capture captures contaminant particles larger than the over-material voids formed between the over-material particles, the over-material used in the over-machine is selected to make the over-material void extremely small. By doing so, it is possible in principle to capture ultrafine pollutant particles.

However, in practice, pollutant particles generated in pools etc. have various substances in various compositions or binding states,
The size is also variable, and it usually occurs in large quantities. Therefore, if an excess material that can capture the smallest of the pollutant particles is used, it will instantly become clogged up, and the circulation speed will slow down, so it will not be possible to secure a purification speed according to the pollutant speed and it will not be practical. . For this reason, no effective solution to the above problem could be derived from the viewpoint of simply using particles having a small gap between the particles of the excess material.

Therefore, in recent years, the same machine as the conventional machine is used, while for the fine pollutant particles that cannot be captured by the machine, a coagulant, an alkaline auxiliary agent, etc. are periodically added to the water to be treated and mixed. Then, various methods have been tried in which a flocculation, which is an agglomerate of fine particles, is formed and the flocs are captured by the above machine to remove the flocs.

A so-called preflock method is known as a typical example of this method. In this method, when the contaminants trapped in the excess machine accumulate for a certain amount or more and the pressure difference between the inlet and the outlet exceeds a certain value, the circulation of the water to be treated is temporarily stopped and It is performed during the backwashing operation performed to regenerate the overcapacity by flowing water from the opposite direction to remove the contaminants, and this backwashing operation is specifically
Backwashing process in which water to be treated is discharged from the opposite direction to discharge contaminants, static process in which this backwashing process is stopped and the flow path is restored to its original state, and residual contaminants are caused to flow water to be treated in the forward direction In this cleaning step, the floc forming tank or the balancing tank in front of the machine is mixed with the aluminum-based coagulant and the alkaline auxiliary agent in the water to be treated in the cleaning step. Is formed and is allowed to flow into the excess machine, thereby stacking backwashable flocs on the surface of the excess tank of the excess machine,
After that, the purification process by the original circulation is restarted.

In other words, the principle of this method is that by stacking flocs on the surface of the excess tank of the machine, it is possible to narrow the gaps between the particles of the excess material and capture even the fine contaminant particles, and the contaminant particles are accumulated for a certain amount or more. After that, the aim is to be able to backwash.

In addition to this, a large amount of coagulant may be added in a short time from just before the machine, or a fixed amount of coagulant may be continuously injected with a small flow rate pump, or 30 minutes or more. Although a method of injecting a fixed amount over a relatively long time has been attempted, both methods are, in principle, the same as the pre-floc method.

[Problems to be Solved by the Invention] However, each of the above-mentioned conventional methods has a certain effect from the viewpoint of capturing a larger amount of pollutants of smaller particles, as compared with a method using only a conventional machine. Although it was observed, it was not possible to obtain a sufficient effect on the decrease in transparency, and in some cases, this treatment caused rather an increase in turbidity.

That is, according to the knowledge of the present inventors, the pre-flock method is intended to trap finer contaminated particles by narrowing the voids between the particles of the over-materials in principle, and the inevitable result thereof. , When particles finer than the narrowed voids have passed, they cannot be trapped, and in general, most of the causes of turbidity are due to extremely fine colloidal turbidity components that cannot be trapped in such excess. It is understood that it is because.

Further, the reason why the turbidity increases due to the treatment by the prefloc method or the like is that the prefloc method is hydrolysis at a high concentration, and the quantitative injection method has low efficiency and a high pH state. Due to the hydrolysis of the above, soft flocs are likely to be formed, and the soft flocs are finely decomposed in the over tank and passed through the over tank to be mixed into the pool or the like, or the flocculated It is understood that the agent, which has a slow floc formation or an extra agent, penetrates into the pool or the like to form flocs in the pool to cause turbidity due to the flocs.

Further, since the treatment by the pre-flock method or the like narrows the voids between the particles of the excess material, the pressure difference between the inlet and the outlet of the excess machine becomes large after this treatment, and the circulation flow rate of the water for treatment is secured. In addition to being disadvantageous to the above, trapped pollutant particles tend to concentrate on the surface of the excess tank and easily settle in a short time,
There is also a drawback that it is necessary to increase the frequency of backwashing.

It is an object of the present invention to provide an over-treatment method in a circulating water treatment apparatus, which eliminates the above-mentioned drawbacks.

[Means for Solving the Problems] The present invention is a research process by which the present inventors elucidate the properties of contaminants of water to be treated such as pools, the reaction mechanism between the contaminants and a coagulant, and the cause of turbidity. It was made based on the knowledge obtained in.

That is, according to the studies by the present inventors, for example, the properties of the hydrolyzed hydroxide of an aluminum-based coagulant such as aluminum sulfate or polyaluminum chloride are not only in the content components of the coagulant but also immediately before the precipitation. Depending on the mixing method, the coagulant concentration, and the hydrogen ion concentration of the water around the coagulant, various things will occur. For example, due to the difference in these conditions, coagulated flocs are aluminum hydroxides represented by Al (OH) _3. And mainly Al ₈ (CH)
In the case of a multi-charged aluminum polymer represented by ₂₀ ⁴⁺ those primarily, of course average diameter of flocs, cohesion, cohesion suspended solid selectivity, shear stress, outstanding even adhesion It has been found that there are differences.

Based on such knowledge, the present invention is based on the above-mentioned conventional pre-floc method, that is, a principle completely different from the principle of laminating flocs on the surface of a tank to narrow the gaps between particles of the material, that is, the material On the surface of the particles themselves, a particle size smaller than the voids between the particles of the oversize material is formed, forming a floc with strong adhesion, excellent mechanical strength, and strong cohesive force. The present invention has devised a new principle of making it possible to surely capture even the colloidal suspended matter component which could not be captured by the conventional principle, and has the following constitution.

A filter treatment method for improving the filtering ability of the filter in a circulating water treatment device, wherein the water to be treated in a water reservoir is at least passed through a filter for purification and then returned to the water reservoir. Before the start of, or at a predetermined time during the backwashing of the filter or during the circulation purification, the inorganic coagulant and the hydrogen ion concentration control in the water flowing through the channel through the channel guiding the water from the water reservoir to the filter The agent is mixed for several tens of seconds to several minutes, and the mixing amount of the inorganic coagulant is 5 to 200 mg /
Within the range of 1 and adjusting the amount of these mixed so that the pH which is lowered by the hydrolysis of the mixed inorganic coagulant does not become 5 or less, the water in the channel is filtered by the filter of the filter. A gap larger than the gap between the filter particles and the filter particles is smaller than the gap between the filter particles when the water contacts the surface of the filter particles without flocs being aggregated. In order to improve the filtering ability of the filter by imparting electrostatic cohesive force to the filter material particles of the filter so that a myriad of inorganic polymer flocs having a particle size and having electrostatic cohesive force are attached. A method for treating a filter in a circulating water treatment device, characterized in that

[Operation] According to the above configuration, the water to be treated in which the hydrogen ion concentration modifier and the inorganic coagulant are mixed is circulated to the excess machine, whereby the excess material particles themselves in all tanks of the excess machine are On the surface, a floc having a particle size smaller than the voids between the particles of the oversize material, strong adhesion, excellent mechanical strength, and strong cohesive force is formed.

As a result, when the water to be treated is circulated through this machine,
The colloidal turbidity component contained in the water to be treated is captured by the flocs having strong cohesive force formed on the surface of the particulate material, and is removed as a part of the flocs. Moreover,
Since this flock has a strong adhesive force and a high mechanical strength, it does not easily come off.

Therefore, it is possible to reliably capture and remove the colloidal suspended matter component that could not be captured in principle by the conventional prefloc method or the like.

In addition, this method only forms fine flocs on the surface of the oversize particles themselves, and the voids between the oversize particles can be remarkably wide compared to the conventional pre-floc method, etc. This is advantageous in securing a flow rate, and trapped contaminated particles do not concentrate on the surface of the excess tank to cause accumulation in a short time, and the frequency of backwashing is low.

[Embodiment] FIG. 1 is a block diagram showing the configuration of an apparatus for carrying out an excess machine treatment method in a circulating water treatment apparatus according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 1, an over-treatment method in the circulating water treatment apparatus according to the embodiment of the present invention will be described.

In the figure, reference numeral 1 is a pool or other water reservoir, and the water to be treated 2 is stored in the water reservoir 1.

A suction pipe 3 is connected to the lower portion of the water reservoir 1, and a return water pipe 4 is connected to the upper portion.

The suction pipe 3 is connected to a branching means 5 and a circulation pump 6 in the middle of the suction pipe 3 in this order, and then connected to a multi-way valve 7, and the return water pipe 4 is directly connected to the suction pipe 3. It is connected to the multi-way valve 7.

Further, the branching means 5 has two branch ports 5a and 5b.
Is provided, and the branch ports 5a and 5b are connected to one connection ports of the on-off valves 8 and 9, respectively, and the other connection ports of the on-off valves 8 and 9 are connected to the liquid supply pipe 10 and It is connected to one end of 11. The other ends of the liquid supply pipes 10 and 11 are provided with a coagulant storage tank 13 in which a coagulant 12 is stored and a hydrogen ion concentration control agent storage in which a hydrogen ion concentration control agent 14 is stored. They are connected to the lower part of the liquid tank 15, and each of these liquid supply pipes 10 and
Flow control valves 16 and 17 are provided in the middle of 11, respectively.

The multi-way valve 7 has a raw water pipe 18, a water pipe 19 and a discharge pipe.
One end of each 20 is connected. The other ends of the raw water pipe 18 and the water pipe 19 are connected to the water to be treated inlet 21a and the overwater discharge port 21b of the excess machine 21, and the other end of the discharge pipe 20 is not shown outside. It is designed to be connected to a waste liquid treatment tank. In addition, the above-mentioned machine 21
Inside, the particles 22 of various particles having various particle sizes are divided into multiple layers and laminated.

In the above-mentioned configuration, when the water treatment by the normal circulation is performed, or when the backwashing step and the stationary step when the treatment is stopped and the backwashing operation is performed, the opening / closing valve 8 and Keep 9 closed.

The method according to the present embodiment is carried out in the cleaning process, which is a process subsequent to the stationary process.

That is, first, the multi-way valve 7 is operated to operate the water pipe 19
Is connected to the discharge pipe 20, and then the opening / closing valves 8 and 9 are opened, and at the same time, the circulation pump 6 is operated so that the coagulant 12 and the hydrogen ion regulator are added to the excess machine 21.
The water to be treated mixed with 14 is circulated for several minutes.

In this case, the flow rate control valve 16 is adjusted so that the concentration of the coagulant in the water for treatment becomes 5 to 200 mg / l. At this time, the hydrogen ion concentration changes due to the hydrolysis of the aggregating agent, but the flow rate adjusting valve 17 is adjusted so that the changing rate becomes a desired value and does not fall below 5 pH.

By this operation, each excess material particle in the excess machine 21
On the surface of 22, there are various properties of flocs such as those of polycharged aluminum polymer with strong organic turbidity cohesive force and flocs of coagulated aluminum hydroxide with strong inorganic turbidity cohesive force, such as adhesion force, shear stress ( Fine flock with extremely strong mechanical strength is formed.

In this case, in the above-described embodiment, the branching means 5 is provided immediately before the circulation pump 6 so that the flocculant and the hydrogen ion concentration adjusting agent are injected immediately before the circulation pump 6. Mixing of the injected coagulant and the like can be performed quickly and effectively without separately providing a means or the like, and desired floc formation can be performed extremely well.

At that time, the water pipe 19 without adhering to the surface of the particulate material 22
The flocs discharged from the device, the surplus coagulant, and the like are discharged to the outside through the discharge pipe 20 and are not mixed into the circulation system.

When this operation is completed, the on-off valves 8 and 9 are closed and the multi-way valve 7 is operated to establish a circulation flow path, and the purification process is restarted.

According to the above-mentioned embodiment, there are the following advantages.

That is, the colloidal turbidity component contained in the water to be treated is captured by the flocs having a strong cohesive force formed on the surface of the particulate material, and is removed as a part of the flocs.
Moreover, since this flock has a strong adhesive force and a high mechanical strength, it does not easily come off.

Therefore, when using a diatomaceous earth pass machine, which was conventionally considered to have the highest over-precision, or when it was subjected to the pre-flock method, etc., it was in principle impossible to capture the colloidal suspended matter component. Can be surely captured and removed, and thereby, it is possible to surely realize the turbidity removal of the pool and the like, which has been impossible in the past, without making any significant changes to the conventional circulating water treatment device.

In addition, this method only forms fine flock on the surface of the over-material particles themselves, and the voids between the over-material particles can be remarkably wider than the conventional pre-flock method, etc.,
The circulation flow rate of the water to be treated can be secured to be almost the same as in the case of the conventional machine without using the coagulant or the like. Therefore,
Even if the contamination rate is high, it is possible to ensure a purification rate that is sufficiently compatible with this.

Further, unlike the conventional pre-flock method, trapped contaminant particles do not concentrate on the surface of the excess tank to cause slumping in a short time, so that the backwashing frequency is low, and under normal conditions. No backwash for a week or two.

From this, the amount of coagulant used can be reduced to about one tenth as compared with the conventional pre-floc method and other coagulation methods, and the treatment operation is a single operation in an extremely short time as described above. Therefore, the time and labor required for the processing can be remarkably reduced as compared with the conventional case.

In addition, the cost of improvement work required to carry out this method using conventional equipment is extremely low, and in the case of newly manufacturing a circulating water treatment equipment, by applying this method, In some cases, it is possible to omit the flock forming tank, the balancing tank, and other equipment that were always required, and it is also possible to make the entire equipment compact and simple and extremely rational.

Since this method can significantly reduce the amount of fresh water that has conventionally been required to be introduced in large amounts to ensure transparency, the cost of introducing the large amount of fresh water itself and the large amount of fresh water. This brings a remarkable advantage that the huge fuel consumption required for heating water to a predetermined temperature can be saved at once.

In addition, the present inventors have carried out this example in various pools, and have confirmed in many cases that a remarkable effect is actually obtained in an actual pool. Indicates.

In this experimental example, the transparency of each other (transparency = transparent distance of water; unit m) is compared under the conditions of the diatomaceous earth filtration method, which has been considered to have the highest accuracy, and the case of this method. It was done.

Condition basin …… 25m pool Effective capacity …… 350m ³ Swimmers …… 560 people / day (same conditions for other swimmers) Results As shown in the attached table.

Note that the present invention is not limited to the above-described embodiment, and for example, injection of a flocculant or the like does not necessarily have to be performed before the circulation pump as in the above-described embodiment, and may be appropriately selected depending on the circulation system. You may make it select a place and inject from that place. In that case, it is desirable to provide an appropriate stirring device so that the coagulant and the like can be quickly mixed after the injection.

[Effects of the Invention] As described in detail above, the present invention is based on the knowledge obtained by the research of the present inventors, that is, the principle devised by the present inventors, that is, on the surface of the oversize particles themselves, It has a smaller particle size than the voids between the particles, has strong adhesive force, has excellent mechanical strength, and forms flocs with strong cohesive force.
The novel principle of flocculating flocculent components in this floc is further developed in light of the above-mentioned knowledge, and a flocculant and a hydrogen ion concentration regulator are appropriately mixed in a part of the water to be treated and allowed to flow unnecessarily. With this extremely simple structure, it can be applied to the over-running of the actual circulating water treatment equipment, which allows colloidal turbidity components that are the main cause of turbidity in pools etc. It is possible to reliably remove.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an apparatus for carrying out an overtreatment method in a circulating water treatment apparatus according to an embodiment of the present invention. 1 ... Water reservoir, 2 ... Water to be treated, 5 ... Branching means, 6 ... Circulation pump, 7 ... Multi-way valve, 8,9 ... Open / close valve, 12 ... Flocculant, 14 ... Hydrogen ion Concentration control agent, 16,17 …… Flow control valve, 21 …… Excessive machine, 22 …… Excess material particles.

Claims (1)

[Claims] 1. A filter treatment method for improving the filtration capacity of a filter in a circulating water treatment apparatus, wherein the water to be treated in a water reservoir is at least passed through a filter to be purified and then returned to the water reservoir. Therefore, before the start of the circulation purification or at a predetermined time during the backwashing of the filter or during the circulation purification, the inorganic coagulant is added to the water flowing through the flow channel for guiding the water from the water reservoir to the filter. And a hydrogen ion concentration adjusting agent are mixed only for several tens of seconds to several minutes, and the mixing amount of the inorganic coagulant is 5 to 200 mg /
Within the range of 1 and the pH of the mixed inorganic coagulant, which is lowered by hydrolysis of the inorganic coagulant, is not adjusted to 5 or less, and the mixing amount of these is adjusted so that the water flowing through the passage contains the filtering material of the filter. Particles smaller than the gap between the filter medium particles and the filter medium particles on the surface of the filter medium particles when the water contacts the surface of the filter medium particles without flocs larger than the gap between the particles and the filter medium particles are not aggregated. A large number of inorganic polymer flocs having a diameter and an electrostatic cohesive force are attached so that the filter material particles of the filter have an electrostatic cohesive force, thereby improving the filtering ability of the filter. A method for treating a filter in a circulating water treatment device, comprising: