JPH06227927A - Agent for preventing removing water bloom - Google Patents

Abstract

PURPOSE:To provide a water bloom-preventing removing agent capable of preventing the eutrophication of water to prevent the generation of water bloom, and capable of efficiently removing the generated water bloom. CONSTITUTION:The water bloom-preventing removing agent contains as an active ingredient, a metal-containing acidic solution, which is produced by treating a mica mineral with an inorganic acid (e.g. hydrochloric acid or solufuric acid) and contains Si, Al, Mg, Fe, K, Na, etc., in large amounts, and Li, Zr, V, Ni, Co, P, Ba, S, etc., in fine amounts, but never contains poisonous substances such as Hg, As, Pd, Cd, and Cr. The mica mineral used as the raw material preferably is easily soluble vermiculite containing many mineral ingredients. The preventing removing agent is useful not only for removing the generated water bloom simply as flocks but also for preventing the generation of the water bloom in lakes, marshes, etc., because of effectively removing phosphorus and nitrogen causing the water bloom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preventive / remove agent for blue-green algae, and more particularly to a preventive / remove agent for water-bloom containing a mineral extract as an active ingredient.

[0002]

2. Description of the Related Art Lakes, parks, ponds of shrines and temples, moat of castles, marshes of golf courses, etc. have little water in and out, and there is little circulation, so water pollutants are likely to accumulate. Especially in lakes and rivers near the city, the inflow of domestic wastewater and factory wastewater increases with the progress of urbanization, eutrophic salts such as phosphorus and nitrogen increase, and algae such as water-bloom and other Aquatic plants proliferate abnormally and water quality is deteriorating.

The deterioration of water quality is not limited to the deterioration of the landscape caused by changes in the habitat environment of fish and the like and the decrease in transparency, but it also causes the problem of unpleasant odor of tap water originating from lakes and rivers. Also, it is becoming an important social problem related to health such as generation of trihalomethane (carcinogenic substance) associated with excessive chlorine input for sterilization. In addition, it was recently found that Aoco itself, which was previously considered nontoxic, produces a highly toxic substance called microcystin, and it has been reported that it may cause liver cancer.

[0004]

Therefore, there has been a demand for providing means for preventing eutrophication in lakes and rivers and effectively suppressing the occurrence of water-bloom.

[0005]

The present inventor has been studying the action of mineral components contained in minerals for many years, but this time, metal-containing acid obtained by acting an inorganic acid on mica-based minerals We have found that the solution can prevent the eutrophication of water to prevent the generation of water-bloom, and also can effectively remove the water-bloom that has occurred, and completed the present invention.

[0006] That is, the present invention provides a preventive / remove agent for blue-green algae containing a metal-containing acidic solution obtained by reacting a mica-based mineral with an inorganic acid as an active ingredient.

The metal-containing acidic solution used as an active ingredient in the agent for preventing and removing water-bloom of the present invention is obtained by allowing an inorganic acid to act on a mica-based mineral at room temperature or under heating and leaving it for several hours to several days. .

Examples of the mica-based minerals used as a raw material for obtaining the metal-containing acidic solution include biotite, phlogopite, iron mica, tinwald mica, and other biotite series mica; muscovite, phlogopite, soda mica, sericite. , Mica series such as illite; vermiculite (flint stone) formed by weathering of these mica. In addition to these, minerals containing mica, for example, minerals such as granite and feldspar, and minerals formed by weathering thereof can also be used. Among these, it is preferable to use vermiculite because the mineral component in the mineral is large and it is easily dissolved.

On the other hand, as the inorganic acid, sulfuric acid, hydrochloric acid or the like can be used, but in view of economical efficiency, sulfuric acid, for example, 25%
It is preferable to use a sulfuric acid aqueous solution having a concentration.

To obtain the metal-containing acidic solution of the present invention, for example, a mica-based mineral is preferably pulverized and then added with 25% thereof.
Sulfuric acid is added in a weight ratio of 4: 3 to 4, preferably left under stirring, and then the insoluble matter is filtered off from the metal-containing acidic solution.

The standing time depends on the temperature. For example, when the above reaction is carried out at room temperature, it is necessary to stand for several days.
When it is performed at 00 ° C., it may be several hours.

The metal-containing acidic solution obtained as described above contains a large amount of Si, Al, Mg, Fe, K, Na and the like,
Further, as trace components, Li, Zr, V, Ni, Co,
Contains P, Ba, S, etc., but Hg, As, Pb, C
It does not contain any harmful substances such as d and Cr.

As the preventive / remove agent for blue-green alga of the present invention, the above metal-containing acidic solution may be used as it is, or a composition in which it is combined with a known liquid or solid carrier may be used.
Examples of the liquid carrier used for preparing the composition include water, ethanol and the like, and the solid carrier includes diatomaceous earth, talc and the like.

In order to prevent the occurrence of water-bloom, the agent for preventing and removing water-bloom of the present invention may be sprayed in advance on the surface of water on which water-bloom is expected to be generated, or it may be sprayed on the surface of water on which water-bloom has been generated. , May be used for removing water-bloom. When used for prevention, it is possible to remove phosphorus and nitrogen, which are the main causes of water-bloom generation, from the treated water area, and as a result, to prevent water-bloom generation. Further, when sprayed in a water area in which water-bloom has been generated, the water-bloom causes coagulation and precipitation, and phosphorus and nitrogen are removed, so that re-generation of water-bloom can be prevented.

The water-blooming preventive / remedy agent of the present invention is generally 50 to 100 as a metal-containing acidic solution with respect to the amount of treated water.
It may be sprayed so as to be about 0 ml / m ^{3, and the} degree of eutrophication is advanced, and when the occurrence of water-bloom is particularly large, it may be sprayed more than this. Since the blue-green alga preventive and remover of the present invention is strongly acidic, it is necessary to pay attention to the pH of the treated water area when used in a large amount, and when it becomes too acidic, it is neutralized with slaked lime, caustic soda, etc. Just do it.

[0016]

The action of the blue-green alga preventive / eliminator of the present invention is presumed to be as follows, although there are some unclear points.

That is, since the metal-containing acidic solution used in the present invention is acidic and contains many metals, these metals react with phosphorus and nitrogen that cause eutrophication and are removed from the treated water area. Therefore, it is considered to suppress and prevent the generation of water-bloom. In addition, when applied to the surface of water on which water-bloom is generated, the water-flocculation ability of the metal-containing acidic solution causes the water-bloom to settle and remove, and also removes phosphorus and nitrogen, so that it can be returned to the original water surface. it is conceivable that.

[0018]

EXAMPLES Next, the present invention will be described in more detail with reference to examples and reference examples, but the present invention is not limited to these examples.

Reference Example 1 Vermiculite (collected in Fukushima Prefecture) was crushed and sieved to obtain a powder of 4 mesh or less. 1 t of this powder is 1000 ° C
It was baked for 40 minutes. After firing, the mixture was allowed to cool, returned to room temperature, put in a mixer, 1 m ³ of 25% sulfuric acid was further added, and the mixture was stirred at 95 ° C. for 4 hours. Then, this mixture was filtered to obtain 0.7 m ³ of a metal-containing acidic solution as a liquid substance. The pH of the obtained liquid product was 0.2, and the compositional components of the liquid product were analyzed and the results were as follows.

[0020] * The unit of content is ppm (μg / ml). N
D shows that it was below the detection limit.

Example 1 Using water from Kunyo Pond (Itami City, Hyogo Prefecture) in which water-bloom outbreaks are observed, pond water is treated with the same water-bloom preventive and remover containing the same metal-containing acidic solution obtained in Reference Example 1. It was examined whether or not the treated water could be purified to the extent that it can be used for domestic water and drinking water.

The test is made of an iron plate and has a diameter of about 30 cm on the side surface.
With a transparent acrylic window attached to the tank, the water in the pond was pumped into a square type 10 ton water tank that allows you to observe the inside of the tank during work, and an automatic reagent adding device, floating sludge recovery device, etc. After installation, the water in the pond was treated with a water-bloom prevention and removal agent, and changes in the amounts of various algae including COD, SS, total phosphorus, total nitrogen, and water-bloom were examined. The results are shown in Table 1.

[0023]

* Indicated by volume of the metal-containing acidic solution obtained in Reference Example 1 with respect to the volume of treated water. The same applies to the following examples. ** A water-bloom preventive / remover was added to the raw water to a concentration of 200 ppm to obtain treated water A. Further, a water-blowing agent was further added to the treated water A so that the concentration was 100 ppm (300 ppm in total) to obtain a treated water B.

As is apparent from these results, when the blue-green alga preventive / eliminator was used at a concentration of 200 ppm, the transparency was improved four times, the COD was 73.5%, and the SS was 76.1.
%, Total nitrogen was improved by 71%, and total phosphorus was improved by 73.8%. In addition, blue-green algae including water-bloom decreased by 87.1%. Furthermore, after the additional injection of 100 ppm,
As shown in Table 1, the transparency is 14 times or more, and
All the measurement items were improved by 90% or more.

Example 2 Purification test of Shinobazu pond water: ○ Collection place Shinobazu Pond, Ueno Park, Taito-ku, Tokyo (Boat pond) ○ Test method 2 l of raw water was collected in a beaker, and a water treatment agent was prescribed while stirring with a glass rod. After adding the amount of the solution and letting it stand for 30 minutes, the supernatant is taken out, and the pH, COD, BOD,
Total nitrogen and total phosphorus were measured.

○ Test result The test was conducted twice, and the first time (June 23) was pH and CO.
D, BOD was measured. Algae prevention and removal agent 200
The removal rate when adding ppm is 58% in COD, BOD
Was 83%. In the second test (June 28th), 50ppm of water-bloom preventive / remove agent was added. At this time, COD was 63%, BOD was 11%, total nitrogen was 70%, and total phosphorus was 75%. Met. Also 100p
The treatment liquid with pm added has a COD of 69% and a BOD of 25.
%, Total nitrogen 71%, total phosphorus 89%.

The BOD removal rate is low because the BOD content of raw water is as low as 5.5 ppm. From this result, the blue-green preventive / eliminator of the present invention is eutrophication,
As a result, it became clear that nitrogen and phosphorus, which are responsible for the development of water-bloom, could be reduced, so that water-bloom development could be effectively prevented.

Practical example 3 Teganuma water purification test: ○ Teganuma water, which is said to be synonymous with a high degree of pollution in lakes, is treated with the water-bloom preventive / remove agent of the present invention to be a pollutant. The removal state was investigated. ○ Sampling place Teganuma, Numanan-cho, Higashi-Katsushika-gun, Chiba Prefecture ○ Test method: Collect 2 liters of raw water in a beaker, add 100ppm and 200ppm of water-bloom preventive / remove agent while stirring with a glass rod, and leave it for about 30 minutes, then Collect the supernatant, pH, C
OD, total nitrogen and total phosphorus were measured.

○ Test result When 100ppm of the preventive agent for blue-green alga is added, the removal rate is 67% for COD, 35% for total nitrogen, and 86% for total phosphorus.
Met. In addition, the removal rate in the case of adding 200ppm of water-bloom prevention / removal agent is 71% for COD and 35% for total nitrogen.
%, And total phosphorus was 97%.

It should be noted that the swamp water is a light brown color, but when a water-bloom preventive / remove agent is added to this, it becomes completely clear water, and it was observed that "rotifers" were actively swimming in this. . From the results of this test, it became clear that although the blue-green alga preventive / eliminator of the present invention effectively removes phosphorus, it has little harm to small animals in water.

Example 4 The metal-containing acidic solution obtained in Reference Example was dissolved in water to a concentration of 1500 ppm to prepare a water-bloom preventive / remove agent.
2 tons of this liquid agent was sprayed on the water-bloom-producing area of the eutrophic lake where the water-bloom was occurring. As a result, the generation of water-bloom weakened and the malodor of water-bloom disappeared.

[0033]

EFFECT OF THE INVENTION The agent for preventing and removing water-bloom of the present invention not only removes the generated water-bloom as flocs, but also effectively removes phosphorus and nitrogen that cause water-bloom, thus preventing the occurrence of water-bloom in lakes and the like. Is also useful. The metal-containing acidic solution, which is the active ingredient of the preventive / remove agent for blue-green algae of the present invention, has no problem for seafood and small animals in water, and for humans and livestock.

Therefore, the water-bloom preventive and preventive agent of the present invention is extremely advantageous in purifying the water quality of lakes and rivers in the suburbs where water quality deteriorates due to eutrophication and using it as a water resource. Is. that's all

Claims (1)

[Claims] 1. A preventive / remove agent for water-bloom containing a metal-containing acidic solution obtained by reacting a mica-based mineral with an inorganic acid as an active ingredient.