JPH07171550A - Green pollutant treatment device for lake, marsh, pond and the like - Google Patents

Abstract

PURPOSE:To float by coagulation pollutants regardless of any kind, separate from water securely and recover smoothly and economically. CONSTITUTION:In a green pollutant treatment device, raw water to be treated containing green pollutants collected from lakes, marshes, ponds and the like are guided into a treatment tank 1, mixed with a coagulant or the like and the green pollutants are separated and recovered. Electrodes 3 for applying direct current are disposed horizontally in the treatment tank 1, and a raw water agitating means 4 for agitating raw water is disposed therein, and a flight type scraper 5 for moving the green pollutants floating by coagulation in the vicinity of water surface on the upper section of the treatment tank 1 toward a discharge section 10 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blue-green algae treatment apparatus for collecting blue-green algae generated in lakes, ponds, etc. for dehydration separation.

[0002]

2. Description of the Related Art Many kinds of phyto- and zoo-plankton survive in water such as lakes and ponds, and the water-bloom which is an aggregate of them has a size of about 0.5 micron.
About 99.9% of it is water, and when it is filtered,
It has the property of changing its shape in various ways such as spherical shape or rod shape.

Conventionally, various studies and experiments have been conducted as a dehydration treatment apparatus for water-bloom, but it is mainly a solid-liquid separation apparatus using physical means such as sand filtration, filter press, sponge filter and the like. In water treatment plants,
The raw water to be treated containing blue-green algae collected from ponds, etc. is led to a large number of very large treatment tanks lined up in a vast treatment plant, after which a coagulant is added to cause sedimentation and separation and concentration. Dehydration methods have been tried.

[0004]

By the way, in the above-mentioned prior art, the clogging of a filter or the like is severe, the blue-green alga cannot be removed from the filter even by the backwashing, and the clogging is also great in the sand filtration, and the backwashing is difficult. It requires a great deal of labor, and some of the water-blooms cannot be completely separated because they do not separate from water even by a flocculant or when they are mixed with an algaecide and do not cause asphyxia or death.

Therefore, the present inventor has paid attention to the above-mentioned circumstances, and has already added a flocculant to the raw water to be treated and mixed it, and after heating the water-bloom to an asphyxia or death state, a method for dehydration treatment. Is proposed. However, there are problems that large-scale equipment is required and the operating cost becomes high. The present invention has been made in view of the above circumstances, and an object thereof is to reliably separate and float from water regardless of the type of water-bloom, and to perform recovery processing efficiently and economically. Providing water-bloom processing equipment for lakes and ponds.

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention, in the water-blowing treatment apparatus, which introduces the raw water to be treated containing water-bloom collected from lakes, ponds, etc. to the treatment tank, and separates and collects the water-bloom by mixing the coagulant and the like, in the treatment tank. An electrode (for example, a carbon rod) for passing a direct current is arranged in a substantially horizontal shape or upward from the bottom, and a raw water stirring means for stirring the raw water is provided, and the raw water is agglomerated and floated near the water surface in the upper part of the treatment tank. It is characterized in that a water-bloom moving means (for example, a flight type scraper) for moving the water-bloom toward the discharge portion is provided. Further, the present invention is characterized in that a solar panel is disposed on the processing tank canopy.

[0007]

According to the present invention, raw water to be treated is introduced into a treatment tank, a flocculant (eg, aluminum sulfate, algaecide, etc.) is added thereto, and the mixture is stirred and mixed by a stirring means, and a direct current is applied to the electrodes. Then, the blue water particles, which are fine particles, are attracted by the surface tension around the air bubbles (hydrogen and oxygen) generated by the decomposition of water between the electrodes, and the water particles that have agglomerated have irregularities on the surface, so the air bubbles can be trapped in the gap or the surface. Stick bubbles to. Therefore, the specific gravity of the aggregated water-bloom becomes smaller than the specific gravity of water, and the water-bloom floats and separates near the water surface.

When the water-bloom in the water to be treated floats, an electric current is generated due to the movement of the ionized water atoms, and the separation state of the water-bloom can be known. In this way, the lumps of water-bloom floating on the surface of the water are forcibly moved toward the discharge part by the moving means such as a flight type scraper, discharged from the processing tank, and transferred to the dehydrator which is the next step. Is guided.

The lumps of water-bloom discharged from the treatment tank are dehydrated and dried, but due to the presence of the algaecide and the application of a weak electric current, they are in an asphyxia or death state, and the dehydration property is very good and clogging of filters etc. is very good. It can be dehydrated efficiently without causing it. Then, the treated water remaining after the floating separation of the water-bloom,
As it is ionized and purified, it can be used as tap water.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention, 1 is a water-blowing tank, 2 is an opening and closing canopy, 3 is an electrode made of a carbon rod, 4 is a propeller-type stirrer as a stirring means, and 5 is a water-bloom moving A flight type scraper as means, 6 is a cake receiver attached to the processing tank 1, 7 is a chemical liquid tank, and 8 is a DC conversion box.

The processing tank 1 is horizontally long and has support legs 9
The raw water receiving part is provided at one end in the longitudinal direction, and the aggregated water-bloom discharging part 10 is provided at the upper part of the cake receiver 6 at the other end, and the raw water supply pipe 11 is guided to the raw water receiving part. The raw water is introduced by a raw water supply pump 12, and a water-bloom discharge pipe 10 is connected to a water-bloom export pipe 13 and a dehydrator 14 is connected to the take-out pipe 13 for dehydration. The solid blue-bloom is cake cake 6
It is then discharged into a container and dried if necessary for use as compost.

Further, a treated water discharge pipe 16 is connected to the lower end of the blue water discharge portion 10 at the other end of the treatment tank 1 through an opening / closing valve 15, and the treated water is returned to a lake, a pond or the like, or is filtered and sterilized. It is used as clean water. And the processing tank 1
A large number of the electrodes 3 are horizontally disposed in parallel with each other between the both side walls in the width direction, and the electrodes 3 are alternately arranged with anodes and cathodes. Electric wires connected to the electrodes 3 are connected to the electrodes 3. A DC output is supplied from the DC conversion box 8 by 17.

Further, in the processing tank 1, the propeller type agitator 4 having a shaft 18 vertically supported by the bottom plate 1A.
Are provided at desired portions on the raw water receiving side at appropriate intervals, and the agitator 4 can be intermittently operated by a motor 19. Further, the flight-type scraper 5 is disposed above the processing tank 1 so as not to interfere with the lid 2 over substantially the entire length of the processing tank 1, and the width of each flight 5A is equal to that of the processing tank 1. The width is made slightly narrower than the width, and the flocculated water-bloom is moved to the discharge unit 10 without being stirred. A known stirrer can be used as the stirrer 5.

A chemical liquid supply pipe 20 to the processing bath 1 is connected to the chemical liquid tank 7 through a valve 21. Further, as shown in FIGS. 3 and 4, the DC conversion box 8 has a built-in DC converter 22 for converting AC to DC, a transformer capacitor 23, etc., an ammeter 24, a breaker 2 and the like.
5, the switch 30 operation lamp 26 is attached to the lid 8A,
A DC output is supplied to the electrode 3 by means of an electric wire 17. In addition, a copper plate (not shown) may be wound around the electrode 3 at an appropriate position to exert an algae killing effect.

In the above embodiment, the case of treating raw water to be treated containing water-bloom collected from lakes, ponds, etc. will be described. First, with the valves 15 and 21 closed, the pump 12 is operated to supply the raw water to be treated into the treatment tank 1,
The valve 21 is opened to quantitatively supply a chemical solution (aqueous solution of aluminum sulfate, polyaluminum chloride, other polymer flocculants, algaecides, etc.), the raw water to be treated is stirred by the stirrer 4, and then a direct current is applied to the electrode 3. Stir at a required time interval while keeping the power on.

When a direct current is applied to the electrode 3 in the reduced water to be treated, the water-blowing agglomerated by the aggregating agent is attracted by surface tension around the bubbles of hydrogen and oxygen generated by the current flow, and the water-blowing agglomerated. Has unevenness on the surface, so that the bubbles are trapped in the crevices or the bubbles are stuck to the surface to form a lump of aggregated water-bloom. The specific gravity of the aggregated water-bloom lumps is smaller than that of water because it takes in air bubbles, and therefore the water-bloom lumps float near the water surface to form a lump film.

On the other hand, although the current is not detected in the ammeter 24 immediately after energization, the current increases with the lapse of time and the purification of the raw water to be treated, that is, the floating state of the flocculated water-bloom can be known. After the lapse of the required time, all the water-blooms in the processing tank 1 aggregate and float to the surface of the water. Therefore, the intermittent stirring and energization are stopped, the flight-type scraper 5 is operated, and the floating water-blooms are discharged from the discharge section. The water-bloom that has been drawn up into the cake tray 6 by being drawn to the dehydration machine 14 after being discharged to the dehydrator 14 through the take-out pipe 13 is dropped on the cake receiver 6. The cake-shaped water-bloom can be dried by a dryer or the like and used as compost or the like.

When the removal of the aggregated water-bloom is completed in this way, the scraper 5 is stopped, the open / close valve 15 is opened, and the treated water is discharged from the discharge pipe 16 and returned to a lake, a pond or the like. The treated water can be washed and sterilized from the discharge pipe 16 with a filter, a sand filter, and a sterilizer, which are not shown, and can be led to the water supply. When the discharge of the treated water is completed, the valve 15 is closed, the raw water supply pump 12 is operated again to supply the raw water to be treated into the treatment tank 1, and the above operation can be repeated to perform the water-bloom treatment.

According to the above-mentioned embodiment, the aggregated blue-green alga does not remain on the bottom of the tank, becomes an asphyxia or a dead state, and can be completely floated and separated, and furthermore, it is scraped up by the flight type scraper 5. It can be collected efficiently and surely. Then, the blue-green alga that has not aggregated even when the conventional aggregating agent is added can be aggregated and floated by applying a direct current to the electrode 3, and separated and collected. Further, the power consumption of the direct current is small, and the blue-green processing can be performed extremely economically, there is no fear of electric shock, and it is safe. Further, the ammeter 24 can be used to know the floating state of the condensed blue-green alga. .

FIGS. 5 and 6 show a second embodiment of the present invention. The difference from the first embodiment is that the electrode 3 is upward (vertical) from the tank bottom 1A and the flight 5A of the scraper 5 is different. Of the solar panel 27 for solar power generation on the canopy 2 so that the DC power stored in the storage battery 29 is energized to the electrodes 3, and The point is that a filter 28 is provided above the dehydrator 14. Since the other constituent parts are the same as those in the first embodiment, the common parts are designated by the same reference numerals and detailed description thereof will be omitted.

According to the second embodiment, there is no residue of water-bloom on the bottom 1A of the tank, DC power can be obtained from sunlight for economical operation, and the water-bloom taken out can be filtered. As a result, the dehydration effect can be enhanced and the same effect as that of the first embodiment can be expected.

FIGS. 7 and 8 show a third embodiment of the present invention. The difference from the first embodiment is that the electrode 3 does not interfere with the flight 5A of the scraper 5 upward from the tank bottom 1A. In this way, it is possible to expect an effect that is substantially the same as that of the first embodiment, and in particular, it is possible to completely prevent the water-bloom remaining on the tank bottom 1A.

In each of the above-mentioned embodiments, the case where the treatment apparatus is operated in a batch system has been described, but at the time when the first treatment is almost finished, the open / close valve 15 is opened to discharge the treated water. The amount of raw water to be treated, which is commensurate with the amount of treated water discharged, is continuously supplied by operating the pump 12, the scraper 5 is also operated slowly and continuously, and the flocculant and the like is appropriately added to maintain the concentration of the water-bloom. Processing can be performed.

Further, the treatment tank 1 is of a water channel type, and the raw water to be treated can be slowly flowed in the tank 1 to continuously perform a large amount of water-bloom treatment. The present invention is not limited to the above embodiment, but can be modified in design as appropriate.

The present invention, as described above, introduces raw water to be treated containing water-bloom collected from lakes and ponds to a treatment tank, and mixes a flocculant and the like to separate and collect water-bloom. In the treatment tank, an electrode for passing a direct current is arranged in a substantially horizontal state or upward from the tank bottom, and a raw water stirring means for stirring the raw water is arranged, and in the upper part of the treatment tank near the water surface. Since it is characterized in that it is provided with a water-blowing moving means for moving the cohesively floated water-bloom toward the discharge part, it can be reliably separated from water regardless of the type of the water-bloom and flocculated and floated, The flocculated algae that have floated can be gently and efficiently moved to the discharge section and smoothly collected. In addition, since the aggregated water-bloom becomes lumps, it can be efficiently dehydrated without causing clogging of the filter and dehydrator, and the adhered water-bloom can be easily removed by backwashing the filter and dehydrator. In addition, continuous large-scale processing of water-bloom is possible by continuous operation of the equipment.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of a DC conversion box in the example.

FIG. 4 is a partially cutaway front view of FIG.

FIG. 5 is a vertical sectional side view showing a second embodiment of the present invention.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a vertical sectional side view showing a third embodiment of the present invention.

8 is a sectional view taken along line CC of FIG.

[Explanation of symbols]

 1 Processing Tank 2 Canopy 3 Electrode 4 Stirrer (Raw Water Stirring Means) 5 Scraping Machine (Blue Water Moving Means) 10 Blue Water Discharging Section 11 Solar Panel

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display C02F 1/465

Claims (4)

[Claims] 1. A blue-green algae treatment apparatus in which raw water to be treated containing blue-green algae collected from lakes and ponds is introduced into a treatment tank and a flocculant and the like is mixed to separate and collect blue-green algae.
In the treatment tank, an electrode for passing a direct current is arranged in a substantially horizontal shape or upward from the bottom of the tank, and a raw water stirring means for stirring the raw water is arranged, and flocculated and floated near the water surface in the upper part of the treatment tank. A water-bloom processing device for lakes, ponds, etc., which is provided with a water-bloom moving means for moving the water-bloom toward the discharge part. 2. A canopy is mounted on the processing tank so as to be openable and closable,
The blue-green alga processing device for lakes and ponds according to claim 1, wherein a solar panel is provided on the canopy. 3. The electrode according to claim 1, which is a carbon rod.
Blue-green aqua processing equipment for lakes and ponds. 4. The water-bloom processing device for lakes, ponds, etc. according to claim 1, 2 or 3, wherein said water-bloom moving means is a flight type scraper.