JPH10156389A - Fluid purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To purify nitrogen compds., phosphorus compds., metallic ions, etc., by imparting the environment suitable to the growth of the photosynthetic bacteria and blue-green algae with the the raising nutrient supplied to a fluid by a raising nutrient feeder and the material to be purified contained in the fluid and metabolizing the photosynthetic bacteria and blue-green algae. SOLUTION: A fluid to be purified is upplied to a tank 1, then a trace element is supplied from a tank 2b, these matter are agitated by an agitator 12 and mixed, and the obtained fluid to be purified is supplied to a fluid purifying unit 4 by a pump 3. A carrier in the unit 4 is irradiated with light, the photosynthetic bacteria and blue-green algae are generated on the carrier and grown, and the fluid is purified. The purified fluid is supplied to a tank 5, the purification degree of the fluid is detected by a detector 11, a valve 7 is opened when the purification need to be continued, a vlave below it is closed, the fluid is returned to the tank 1, and the process is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid purifying apparatus, and more particularly, to a novel fluid purifying apparatus using cyanobacteria.

[0002]

2. Description of the Related Art Conventionally, proposals have been made to treat heavy metals with microorganisms and fungi. Proposed methods include (1) the combined use of activated sludge with other materials, and (2) the treatment of cadmium and mercury with judemonas.

It has also been proposed to treat heavy metals by an alkali method using sodium hydroxide, calcium hydroxide or the like. It has also been proposed to treat heavy metals using ion exchange resins.

[0004]

However, in the methods proposed for treating heavy metals with microorganisms and fungi, not only no practical device has been proposed, but also heavy metals themselves act as biotoxins. Therefore, it is almost impossible to sufficiently purify a fluid in which a plurality of types of metals are mixed. Further, when the component ratio of these metals fluctuates, the fluid purification effect becomes further insufficient.

When a heavy metal is treated by an alkali method, a compound of the heavy metal with sodium, calcium or the like is formed, so that the concentration of the heavy metal in the fluid is sufficiently reduced (for example, from the environmental standard value). Is also difficult to reduce to low concentrations).
Depending on the H adjustment, the compound is redissolved. Also,
It is not possible to employ this method with complex salts.

When heavy metals are treated using an ion-exchange resin, it is possible to treat low-concentration heavy metals in a fluid. However, the ion-exchange resin is expensive, and heavy metals that can be treated with the ion-exchange resin can be treated. Due to the limited amount, it is not at all applicable to the practical treatment of heavy metals at high concentrations. Further, it is conceivable to treat copper or the like using potassium phosphate or the like, but in this case, potassium phosphate or the like remains in the fluid, and it is impossible to treat the remaining potassium phosphate. It is almost impossible to apply this method.

Further, as a method for removing nitrated nitrogen, a method using activated sludge and a method using denitrifying bacteria have been proposed, but a method capable of sufficiently reducing the concentration has not yet been proposed. Regarding the treatment of phosphorous, a treatment for apatite-forming to coagulate and precipitate has been proposed, but it is difficult to sufficiently reduce the concentration of phosphorus.

[0008] Further, substances required to be removed from the fluid include cyanide, chlorine and fluorine.
No method has been proposed for removing traces of these substances from the fluid.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and treats heavy metals, arsenic, cyanide, chlorine, fluorine, and the like contained in a fluid to sufficiently increase their concentrations (for example, It is an object of the present invention to provide a novel fluid purification device capable of lowering the concentration to a concentration lower than the environmental standard concentration.

[0010]

A fluid purifying apparatus according to a first aspect of the present invention comprises a light source, a carrier for adhering photosynthetic bacteria and / or blue-green algae, and a fluid purifying means including a container for containing a fluid to be purified. And a growing nutrient supply device for supplying growing nutrients other than the substance to be purified in the fluid to be purified, wherein the photosynthetic bacteria and / or blue-green algae attached to the carrier are supplied from the light source. It purifies the fluid by metabolic action caused by light irradiation.

According to a second aspect of the present invention, the growing nutrient supply device dispenses at least phosphoric acid into a fluid to be purified and deposits a metal phosphate compound precipitate contained in the fluid to be purified. What is removed from the fluid to be purified is adopted. According to a third aspect of the present invention, as the growing nutrient supply device, a solid or a precipitate having a predetermined solubility or a solubility product and containing a growing nutrient is contained, and the solid or the precipitate is an object of purification. The one that comes into contact with the fluid is adopted.

The fluid purification apparatus according to a fourth aspect of the present invention further includes a hydroxide generation apparatus for precipitating and separating metals contained in a fluid to be purified by high pH treatment at a stage preceding the growing nutrient supply apparatus. It is. The fluid purifying apparatus according to a fifth aspect further includes a separation / extraction device that leaves the photosynthetic bacteria and / or cyanobacteria that have landed on the carrier, separates them from the fluid to be purified, and extracts the separated fluid.

According to a sixth aspect of the present invention, there is provided a fluid purifying apparatus which separates photosynthetic bacteria and / or cyanobacteria from a fluid to be purified by filtration.

[0014]

According to the fluid purifying apparatus of the first aspect, a light source, a carrier for attaching photosynthetic bacteria and / or cyanobacteria,
Fluid purifying means including a container for containing a fluid to be purified, and a growing nutrient supply device for supplying growing nutrients other than the substance to be purified in the fluid to the fluid to be purified, Since the fluid is purified by metabolic action caused by irradiation of the photosynthetic bacteria and / or cyanobacteria attached to the carrier with light from the light source, nitrogen compounds, phosphorus compounds, and metal ions contained in the fluid are purified. , Even if the concentration of organic matter is low, it is necessary for metabolism of photosynthetic bacteria and / or cyanobacteria. Therefore, these are surely incorporated into photosynthetic bacteria and / or cyanobacteria and used, and nitrogen compounds, phosphorus compounds, The concentration of metal ions, organic substances, and the like can be significantly reduced, that is, the fluid can be purified. In other words, the growth nutrient supplied to the fluid by the growth nutrient supply device and the substance to be purified originally contained in the fluid provide an environment suitable for the growth of photosynthetic bacteria and / or cyanobacteria, And / or reduce the concentration of nitrogen compounds, phosphorus compounds, metal ions, and organic substances contained in the fluid sufficiently (for example, to a concentration lower than the environmental standard concentration) by causing the metabolism of cyanobacteria. Can be done.

In the fluid purifying apparatus according to the second aspect, the growing nutrient supply apparatus dispenses at least phosphoric acid to a fluid to be purified and precipitates a metal phosphate compound contained in the fluid to be purified. Since a substance that removes substances from the fluid to be purified is adopted, when the concentration of metal contained in the fluid is high, a phosphoric acid compound precipitate is formed and removed, whereby the fluid is removed. The concentration of the contained metal is reduced to some extent, and then the concentration of the nitrogen compound, the phosphorus compound, the metal ion, the organic substance, etc. contained in the fluid is sufficiently increased (for example, as in claim 1).
(Lower than the environmental standard concentration).

According to a third aspect of the present invention, as the growing nutrient supply device, a solid or a precipitate having a predetermined solubility or solubility product and containing a growing nutrient is accommodated, and the solid or the precipitate is supplied. Since the fluid that is brought into contact with the fluid to be purified is employed, the supply of the growing component can be simplified, and the same operation as that of claim 1 or claim 2 can be achieved.

According to the fourth aspect of the present invention, there is further provided a hydroxide generating apparatus for precipitating and separating metals contained in a fluid to be purified by high pH treatment in a stage preceding the growing nutrient supply apparatus. Therefore, when the concentration of the metal contained in the fluid is high, the concentration of the metal contained in the fluid is reduced to some extent by precipitating a certain amount of metal by high pH treatment, Thereafter, a nitrogen compound contained in the fluid in the same manner as in claim 1;
The concentration of phosphorus compounds, metal ions, organic substances, and the like can be sufficiently reduced (for example, to a concentration lower than the environmental standard concentration).

[0018] In the fluid purifying apparatus according to the fifth aspect, the apparatus further comprises a separation / extraction apparatus for releasing the photosynthetic bacteria and / or cyanobacteria that have landed on the carrier, and separating and extracting them from the fluid to be purified. Claims 1 to 4
In addition to the above-mentioned effects, it is possible to prevent the disadvantage that photosynthetic bacteria and / or cyanobacteria naturally leave the bed and contaminate the fluid again.

According to the fluid purifying apparatus of the present invention, the separating and extracting apparatus adopts one that separates photosynthetic bacteria and / or cyanobacteria from the fluid to be purified by filtration. The same operation as described above can be achieved.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view schematically showing one embodiment of the fluid purification apparatus of the present invention.
This fluid purifying apparatus includes a first tank 1 to which a fluid to be purified (a fluid to be purified) is supplied, and a trace element (for growing photosynthetic bacteria and / or cyanobacteria) via a first valve 2a, respectively. A plurality of second tanks 2b for supplying necessary nutrients, also referred to as growing nutrients) to the first tank 1, and a fluid purification unit 4 to which a fluid to be purified is supplied from the first tank 1 via the first pump 3. A third tank 5 for temporarily holding a fluid flowing out of the fluid purification unit 4, and a second tank 5 for taking out the fluid from the third tank 5.
A pump 6, a second valve 7 for supplying the fluid taken out by the second pump 6 to the first tank 1 again,
It has a post-processing unit 9 to which the fluid taken out by the pump 6 is supplied via a third valve 8, and a filter 10 for collecting foreign matter in the fluid flowing out of the post-processing unit 9. In addition, 11 is a detector for detecting the degree of purification of the fluid in the third tank 5, and 12 is for sufficiently mixing and stirring the fluid in the first tank 1 and the trace element supplied from the second tank 2b. Stirrers, 13 and 14 are fluid purification units 4, a fourth valve for controlling the amount of fluid flowing into the post-processing unit 9, 15 and 16 are fluid purification units 4,
The fifth valve controls the outflow amount of the fluid from the post-processing unit 9. Although not shown in FIG. 1, a predetermined process (such as a process for determining whether or not the purification of the fluid has been completed) is performed using a detection signal output from the detector 11 as an input, and based on the processing result. The first valve 2a, the second valve 7, the third valve 8, and the stirrer 12 are controlled (when the purification of the fluid is not completed, the fluid is circulated, and when the purification of the fluid is completed, Controller for controlling the supply of fluid to the aftertreatment unit 9).

The detector 11 detects the concentration of the trace element in the fluid in the third tank 5, the concentration of the substance to be removed from the fluid, the pH value, and the like. The second tank 2b contains components necessary for growth of photosynthetic bacteria and / or cyanobacteria (mainly, nitrogen components by nitric acid,
The first valve 2 is used to supply all of these components or only components not contained in the fluid to be treated.
It can be selected by opening and closing a. Specifically, for example, as trace elements, KNO ₃ is 0.01 to 1.00 g / l, and K ₂ HPO ₄ is 0.006 to
1.00 g / l, MgSO ₄ .7H ₂ O from 0.038 to
0.25 g / l, 0.01% Ca (NO ₃ ) ₂ .4H ₂ O
5 to 0.025 g / l, 0 to 0.10 g / NaCl
1 and NaHCO ₃ at 0 to 0.046 g / l, respectively.

The fluid purification unit 4 has a carrier for generating and growing photosynthetic bacteria and / or cyanobacteria at a location where the fluid to be treated flows,
A light source for irradiating the photosynthetic bacterium and / or blue-green algae generated on the surface of the carrier with light; and by setting the treatment target fluid in a state suitable for growth of the photosynthetic bacterium and / or blue-green algae, Bacteria and / or cyanobacteria develop and grow, and due to the metabolism associated with the occurrence and growth, heavy metals, cyanide, chlorine, fluoride ions, etc. originally contained not only in the added trace elements but also in the fluid to be treated. The fluid to be taken in and processed can be purified. Here, as the carrier, any material can be used as long as it can support photosynthetic bacteria and / or cyanobacteria, but in order to efficiently perform light irradiation, a transparent material is required. It is preferable to use one made of a material.

The post-processing unit 9 performs post-processing such as sterilization. The operation of the fluid purification device having the above configuration is as follows. The fluid to be purified is the first tank 1
First, the trace element is supplied from the second tank 2b by opening the first valve 2a, and the stirrer 12 is operated to stir and mix the fluid to be treated and the trace element.

The fluid to be purified to which the trace element has been added in this manner is supplied to the first pump 3 and the fourth valve 1.
3 to the fluid purification unit 4. In the fluid purifying unit 4, the carrier inside the fluid purifying unit 4 is irradiated with light, and the fluid flowing through the carrier is in a state suitable for the growth of photosynthetic bacteria and / or cyanobacteria. Bacteria and / or cyanobacteria develop and grow on the carrier. Then, due to the metabolic action of photosynthetic bacteria and / or cyanobacteria accompanying this generation and growth, not only the added trace elements, but also heavy metals, cyanide, chlorine, fluorine ions, etc. originally contained in the purification target fluid are taken in, The treatment target fluid can be purified. In addition, the opening degrees of the fourth valve 13 and the fifth valve 15 are set in advance so that, for example, the photosynthetic bacteria and / or cyanobacteria that have occurred on the carrier and grew are not separated from the carrier by the fluid to be treated. Is set. This means that photosynthetic bacteria and / or cyanobacteria separated from the carrier will die,
Heavy metals taken in by being decomposed,
This is to prevent the inconvenience that cyanide, chlorine, fluorine ions and the like come out of the fluid to be treated.

The fluid to be treated, which has been purified to some extent in the fluid purification unit 4, is supplied to the third tank 5 through the fifth valve 15. In the third tank 5, the degree of purification of the fluid (the concentration of the trace element in the fluid, the concentration of the substance to be removed from the fluid, the pH value, etc.) is detected by the detector 11, and the purification process needs to be continued. It is determined by a controller (not shown) whether or not the cleaning process has been completed, and the controller outputs a control signal corresponding to the determination result.

When it is determined by the controller that the purifying process needs to be continued, the second valve 7 is opened and the third valve 8 is closed, so that the fluid to be treated is guided again to the first tank 1. The above-described series of processing is repeated to further purify the fluid to be processed. Conversely, when the controller determines that the purification process has been completed, the third valve 8 is opened and the second valve 7 is closed, so that the fluid to be treated is supplied to the post-processing unit 9 and sterilized. Post-processing is performed, and foreign matter (photosynthetic bacteria and / or blue-green algae separated from the carrier and subjected to post-processing such as sterilization) is collected by the filter 10, and thereafter, the purified fluid (for example, , A fluid having a concentration of heavy metals, arsenic, cyanide, chlorine, fluorine, etc. lower than the environmental standard concentration).

In performing the above series of treatments, photosynthetic bacteria and / or cyanobacteria may be preliminarily supported on the carrier, but may not be supported. In particular, in the case of the latter, photosynthetic bacteria and / or blue-green algae whose growth and nutrients correspond to the type of the substance contained in the fluid to be purified are naturally generated, and the fluid to be treated is purified. be able to.

More specifically, when at least one of phosphoric acid, nitric acid, metal and the like is contained in the fluid to be treated, components not originally contained in the fluid to be treated are supplied from the second tank 2b. Thereby, a state in which all the components satisfying the growth conditions are included is created, and photosynthetic bacteria and / or cyanobacteria can be generated and grown on the carrier. And the concentration of the substance originally contained in the fluid to be treated can be reduced by the metabolic action accompanying the generation and growth of photosynthetic bacteria and / or cyanobacteria. In fact, individual components could be reduced to below 10 ^-2 ppm.

As for the water softening, it is sufficient to consider that the metal whose concentration is to be reduced is calcium. Similarly, it is possible to reduce the calcium concentration, that is, to achieve water softening. Purification of a fluid to be treated containing cyan is extremely difficult in other biological treatments, and conventionally, it has been considered that purification in which the concentration of cyan is reduced is almost impossible. However, originally, photosynthetic bacteria and / or
Alternatively, cyanobacteria, as referred to as cyanobacteria, are resistant to cyan, and the cyan concentration can be reduced by employing the above embodiment. In addition, by employing an ultraviolet lamp as a light source of the fluid purification unit 4, direct decomposition by ultraviolet light can be used, and cyanide is effectively decomposed and treated by a synergistic effect of metabolism and direct decomposition by ultraviolet light. be able to.

Conventionally, the purifying treatment of the fluid to be treated containing chlorine and fluorine has been performed by using an ion exchange resin. However, as a result of intensive studies by the present inventors, it has been found that some photosynthetic bacteria and / or cyanobacteria have resistance to chlorine and fluoride ions. Therefore, by adopting the above embodiment, chlorine and fluorine can be taken into the body of photosynthetic bacteria and / or cyanobacteria and made harmless.

In the above embodiment, the first valve 2a is opened to supply the trace element from the second tank 2b to the first tank 1. However, the phosphate (containing chelate salt), Solid matter having low solubility such as salt may be simply placed in the first tank 1 in the form of powder or lump. In this case, the configuration can be simplified by omitting the first valve 2a and the second tank 2b, and a fixed amount of trace elements determined by the solubility can be supplied to the fluid to be treated. In this case, it is preferable to employ, as the phosphate, the hydroxide, and the like, those which are harmless substances such as calcium. Specifically, it was confirmed that trace elements could be supplied by using calcium phosphate, copper phosphate, or the like.

Actually, when the surface area of the carrier is 1 m ² and the flow rate of the treated water is 1 l / min, the nitric acid concentration is about 1
ppm could be reduced. For metal ions, about 10% of the nitric acid could be treated as measured at the copper concentration. FIG. 5 shows a 60-liter water tank containing a carrier having a surface area of about 1 m ² and Cu
FIG. 9 is a diagram showing a result of measuring a Cu ²⁺ concentration in an aqueous solution after addition of SO ₄ and an approximate expression approximating a change in the Cu ²⁺ concentration. In FIG. 5, a indicates that the concentration of seawater is 24 m.
Cu ²⁺ in the case of adding CuSO ₄ to a g / l
The change in the concentration is shown in FIG.
1 shows a change in the concentration of Cu ²⁺ when CuSO ₄ is added so that l is obtained, c shows an approximate expression corresponding to a, and d shows b
Shows an approximate expression corresponding to. In addition, the horizontal axis represents time in logarithm, and it is assumed that CuSO ₄ was added at the time of 0.1 hour.

As is clear from FIGS. 5A and 5B, the Cu ²⁺ concentration could be reduced to a concentration close to the concentration before the addition of CuSO ₄ in a relatively short time. From the measurement results, the Cu ²⁺ removal ability in seawater was 27 ppm / m ² / d.
ay, and the ability to remove Cu ²⁺ in fresh water was 32 ppm /
It can be seen that m ² / day. Further, when the Cu ²⁺ concentration is represented by y and the time is represented by x, the approximate expression of c is y = 12.749 + -10.239 log (x), R =
0.98061, and the approximate expression of d is y = 7.3649.
+ −6.007 log (x), R = 0.96085. Here, the first term of each equation indicates the final time, the constant part of the second term indicates a logarithmic slope, and R is a correlation coefficient indicating the degree of approximation to the original graph.

Since both the approximation formula c and the approximation formula d have a high degree of approximation to the original graph, the necessary purification time and the like can be easily calculated by performing calculations based on these formulas. . FIG. 2 is a block diagram showing another embodiment of the fluid purification device of the present invention. This fluid purification apparatus differs from the fluid purification apparatus of FIG. 1 in that a hydroxide {eg, Ca (OH) ₂ } is supplied to a solution to be treated before the fluid to be treated is supplied to the first tank 1. 4 tanks 1
7, a first precipitation tank 18, a fifth tank 19 for supplying phosphate ions to the solution to be treated, a second precipitation tank 20, a third pump 21
Are arranged in this order, and the sixth valves 22 and 23 for removing the sediment from the sedimentation tanks 18 and 20 are provided.

The fourth tank 17 and the fifth tank 1
9 is provided with stirrers 17a and 19a. Also,
Reference numerals 17b and 19b denote seventh valves for controlling the supply amounts of hydroxides and phosphate ions to the fourth tank 17 and the fifth tank 19, or for controlling the supply and the stop of the supply.
The eighth valve controls the supply amount of the processing target fluid to the tank 17 or controls supply and stop of the supply. When the second valve 7 is opened, the fluid sent from the second pump 6 and the fluid sent from the third pump 21 are supplied to the first tank 1.

This embodiment is suitable, for example, for purifying a fluid to be treated having a high metal content. When this embodiment is employed, first, a conventionally known hydroxide generation method is applied to the fourth tank 17 and the first precipitation tank 18,
The hydroxide precipitate is removed through the sixth valve 22.
Next, phosphate ions are supplied to the treatment target fluid from which the hydroxide precipitate has been removed in the fifth tank 19 to precipitate excess calcium as calcium phosphate. The calcium phosphate is removed through the sixth valve 23. By this treatment, high pH neutralization can be achieved.

Thereafter, the fluid to be treated from which calcium phosphate has been removed is supplied to the first tank 1 by the third pump 21, so that the fluid to be treated is purified (for example, heavy metals) as in the embodiment of FIG. , The concentration of arsenic, cyanide, chlorine, fluorine and the like is lower than the environmental standard concentration). Here, since the method of precipitating the phosphate has not had a means for post-treatment of excess phosphoric acid in the past,
It has not been employed in the treatment of fluids. However, in this embodiment, since the excess phosphoric acid is taken up by photosynthetic bacteria and / or cyanobacteria, a method of precipitating phosphate can be employed, and the method is relatively simple compared to precipitation by hydroxide. Since the pH can be adjusted in a neutral range, the pH is adjusted and maintained in the precipitation step, and the pH is adjusted in the subsequent step.
This has the advantage that H adjustment is not required.

[0038] In addition, those which form a hardly soluble or insoluble precipitate as a phosphate include silver, aluminum, barium, beryllium, bismuth, cadmium, cesium, calcium, copper, chromium, cobalt, iron, indium, lanthanum, nickel, There are lead, tin, strontium, thorium, uranium, vanadium oxide, ytterbium, zinc, mercury and many other metals.

Specifically, a fluid purifying device having the structure shown in FIG. 2 is used, and for example, KN is used as a trace element.
The _{O 3 0.01~1.00g / l, K 2} HPO 4 0.0
06~1.00g / l, the MgSO ₄ · 7H ₂ O 0.03
_{8~0.25g / l, Ca (NO 3} ) 2 · 4H 2 O 0.
015 to 0.025 g / l, 0 to 0.10 g of NaCl
/ L, NaHCO ₃ in the range of 0 to 0.046 g / l, respectively, was added to the fluid to be purified, and the fluid was purified. As for metals, the concentration of copper, iron, cadmium, chromium, aluminum, etc. could be reduced. With the exception of metals, the concentrations of calcium, gallium, arsenic, chlorine and the like could be reduced.

In particular, when a high-concentration waste liquid is treated, a rough treatment is performed by a hydroxide generation method, and then phosphate ions are supplied to precipitate phosphates. By performing the process, it is possible to efficiently and highly accurately perform the purification process. Specifically, in the case of copper, if it is treated to about 10 ppm or less in the preceding stage of the fluid purification device of FIG. 1 and then treated by the fluid purification device of FIG. 1, it can be treated efficiently, and it can be reduced to 0.01 ppm or less. Can be purified up to.

When the conventional hydroxide precipitation method or coagulation precipitation method is employed, a large space such as an extractor is required for separating the precipitate, and the incorporation of the precipitate into the supernatant is completely eliminated. Although it was difficult to purify the fluid, the fluid purification apparatus of FIG. 2 purifies the fluid using the metabolic action of photosynthetic bacteria and / or cyanobacteria. It is not necessary to completely eliminate the contamination, and the photosynthetic bacteria and / or cyanobacteria separated from the carrier contained in the fluid purification unit 4 can be easily and completely separated using a fairly coarse mesh or filter cloth. be able to.
Also, the volume can be smaller than the disposal of hand-on exchange resin by the adsorption method and the treatment of ferrite by the ferrite method,
There is also an advantage that the efficiency after disposal and incineration after drying is good.

FIG. 3 is a block diagram showing still another embodiment of the fluid purifying apparatus of the present invention. This fluid purifying device is provided with two first tanks 1, and purifies fluid to be purified from one of the first tanks 1 selected by the ninth valve 25 by the first pump 3 through the fourth valve 13. The fluid that is supplied to the unit 4 and flows out of the fluid purification unit 4 is supplied to the first first valve 27 via an eleventh valve 27 selectively opened corresponding to the fifth valve 15, the tenth valve 26, and the ninth valve 25. It is supplied to tank 1. In addition, 2
Reference numeral 8 denotes a twelfth valve for selectively supplying a fluid to be purified from the outside to any one of the first tanks 1, reference numeral 29 denotes a thirteenth valve for removing deposits and the like in the first tank 1, and reference numeral 30 denotes a fluid purification. A fourteenth valve for taking out the purified fluid flowing out of the unit 4 to the outside. Although not shown in FIG. 3, each first tank 1 is provided with a detector for detecting the degree of purification of the fluid, a tank for supplying a trace element, and the like.

Therefore, when this embodiment is adopted, the condition between the first tank 1 and the fluid purification unit 4 is provided on condition that a predetermined amount of the fluid to be treated is supplied to one of the first tanks 1. The fluid can be purified by circulating the fluid to be processed in the step (1), and the fluid to be processed can be supplied to the other first tank 1 during this. FIG. 4 is a schematic view showing still another embodiment of the fluid purification apparatus of the present invention.

In this fluid purifying apparatus, a source water tank 31 for containing a processing target fluid, a first pump 32 for taking out the processing target fluid from the source water tank 31, and a processing target fluid taken out by the first pump 32 are supplied. Fluid purification unit 33 having a multi-stage configuration (six-stage configuration in the embodiment)
A storage tank 34 for temporarily storing the processing target fluid purified by the fluid purification unit 33; a water level detection switch 35 for detecting the amount of the processing target fluid in the storage tank 34; And a second pump 36 for taking out and returning to the source water tank 31. In addition, a valve 37 for removing the precipitate is provided below the source water tank 31, and a sludge tank 38 for holding the precipitate removed through the valve 37 is provided. In addition, a configuration for supplying a trace element, a configuration for detecting whether or not the processing target fluid has been purified, a configuration for extracting the purified processing target fluid, and the like are not illustrated.

Each of the fluid purifying units constituting the fluid purifying unit 33 includes a fluid purifying tank 3 for storing a fluid to be treated.
3a, a carrier 33 contained in a fluid purification tank 33a
b, the light source 33c for irradiating light to the photosynthetic bacteria and / or cyanobacteria generated and adhered to the surface of the carrier 33b, and the amount of the fluid to be treated in the fluid purification tank 33a exceeds a predetermined amount. And an overflow pipe 33d for overflowing an excessive amount of the fluid to be treated. In addition, the position of the overflow pipe 33d is set so as not to face up and down between the vertically adjacent fluid purifying sections.

When it is detected by the water level detection switch 35 that the amount of the fluid to be treated in the storage tank 34 has become equal to or greater than a predetermined amount (the water level is equal to or higher than the predetermined water level), the second pump 36 is operated to store the fluid. The processing target fluid is taken out of the tank 34 and returned to the source water tank 31. When the fluid purifying apparatus having the configuration shown in FIG. 4 is employed, the fluid to be treated is taken out of the source water tank 31 by the first pump 32 and is transferred to the fluid purifying unit 33 having a multi-stage configuration (six-stage configuration in the embodiment). By supplying, the fluid to be treated can be effectively purified. In addition, photosynthetic bacteria and / or
Alternatively, if it is necessary to remove the cyanobacterium from the carrier 33b contained in the fluid purification unit in which a predetermined amount or more has propagated, only the pertinent fluid purification unit is removed from the fluid purification unit 33 to perform necessary processing (photosynthesis). Bacteria and / or cyanobacteria). Then, while performing this operation, the other fluid purifying unit is operated by the fluid purifying unit 33.
Therefore, the purification of the fluid can be continued as it is.

Examples of the fluid to be purified that can be purified according to each of the above embodiments include a fluid used for cleaning semiconductors, various types of industrial wastewater, and the like, but are not limited thereto, and include heavy metals. Any fluid may be used as long as it is a fluid.

[0048]

According to the first aspect of the present invention, the growth nutrient supplied to the fluid by the growth nutrient supply device and the substance to be purified originally contained in the fluid are used to grow photosynthetic bacteria and / or cyanobacteria. By providing a suitable environment for metabolizing photosynthetic bacteria and / or cyanobacteria, nitrogen compounds, phosphorus compounds, metal ions,
This has a specific effect that the concentration of organic substances and the like can be sufficiently reduced (for example, to a concentration lower than the environmental standard concentration).

According to the second aspect of the present invention, when the concentration of the metal contained in the fluid is high, the concentration of the metal contained in the fluid is reduced to some extent by forming and removing a phosphate compound precipitate. After that, the concentration of nitrogen compounds, phosphorus compounds, metal ions, organic substances, etc. contained in the fluid is sufficiently reduced (for example, to a concentration lower than the environmental standard concentration) in the same manner as in claim 1. It is possible,
As a result, a specific effect that the required time can be shortened is exerted.

The invention of claim 3 has a specific effect that the supply of the growing component can be simplified in addition to the effect of claim 1 or 2. According to the fourth aspect of the present invention, when the concentration of the metal contained in the fluid is high, the concentration of the metal contained in the fluid is reduced to some extent by precipitating a certain amount of metal by high pH treatment. A nitrogen compound contained in the fluid thereafter, as in claim 1.
This has a specific effect that the concentration of a phosphorus compound, metal ion, organic substance, or the like can be sufficiently reduced (for example, to a concentration lower than the environmental standard concentration).

The invention of claim 5 is the invention of claims 1 to 4
In addition to any of the above effects, a unique effect is obtained in that the inconvenience of photosynthetic bacteria and / or cyanobacteria naturally leaving the bed and contaminating the fluid again can be prevented. The invention of claim 6 has the same effect as that of claim 5.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing one embodiment of a fluid purification device of the present invention.

FIG. 2 is a block diagram schematically showing another embodiment of the fluid purification device of the present invention.

FIG. 3 is a block diagram schematically showing still another embodiment of the fluid purification device of the present invention.

FIG. 4 is a view schematically showing still another embodiment of the fluid purification apparatus of the present invention.

FIG. 5 is a diagram showing a result obtained by storing a carrier having a surface area of about 1 m ^{2 in} a 60-liter water tank and measuring a Cu ²⁺ concentration in an aqueous solution after CuSO _{4 is} added, and an approximate expression approximating a change in the Cu ²⁺ concentration. It is.

[Explanation of symbols]

 2a first valve 2b second tank 4 fluid purification unit 10 filter 17 fourth tank 17b fifth valve

Claims (6)

[Claims] 1. A fluid purifying means (4) including a light source, a carrier for attaching photosynthetic bacteria and / or cyanobacteria, and a container containing a fluid to be purified, and a fluid purifying means. Nutrient supply devices (2a) and (2b) for supplying nutrients other than the substance to be purified in the fluid, and the light from the light source is applied to the photosynthetic bacteria and / or cyanobacteria attached to the carrier. A fluid purifying apparatus characterized in that a fluid is purified by a metabolic action accompanying the operation. 2. The growing nutrient supply device (2a) (2b).
The method according to claim 1, wherein at least phosphoric acid is dispensed to the fluid to be purified, and a metal phosphate compound precipitate contained in the fluid to be purified is removed from the fluid to be purified. Fluid purification equipment. 3. The growing nutrient supply device contains a solid or a precipitate having a predetermined solubility or solubility product and containing a growing nutrient, and brings the solid or the precipitate into contact with a fluid to be purified. Claim 1
A fluid purifying apparatus according to claim 1. 4. The growing nutrient supply device (2a) (2b)
4. The apparatus according to claim 1, further comprising a hydroxide generator (17) (17b) for precipitating and separating metals contained in the fluid to be purified by the high pH treatment at a stage preceding the step (b). A fluid purifying apparatus according to any one of claims 1 to 3. 5. A photosynthetic bacterium which has been implanted on the carrier and / or
The fluid purifying apparatus according to any one of claims 1 to 4, further comprising a separation / extraction device (10) that separates and removes the cyanobacteria from the fluid to be purified. 6. The fluid purifying apparatus according to claim 5, wherein the separation / extraction device (10) separates photosynthetic bacteria and / or cyanobacteria from a fluid to be purified by filtration.