JP2532293B2 - Flocculant and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to an animal bone-containing flocculant using food waste incineration ash, and a method for producing the same.

(Prior art) Although new culture is created by modern industries and industries developed by humankind, on the other hand, it also has a great impact on the natural environment and destroys and pollutes nature beyond the purifying action of nature. It has occurred.

In order for humanity to always have a healthy and cultural life,
It is necessary to eliminate the adverse effects of industrial development and create a new environment suitable for the development of life. The problem of incineration of garbage, which is the closest to life, has become a problem not only in Japan but also around the world.

Although various institutes in each country have been researching various problems related to the incineration ash treatment of raw garbage, the present situation is that no drastic solution has been found.

On the other hand, sulfuric acid bands, aluminum chloride, ferric chloride, etc. are conventionally known as coagulants for coagulating organic substances in wastewater. In addition, wastewater containing organic substances has usually been treated by the activated sludge method. However, all of the conventional flocculants react on the acidic side, and the treated water is inevitably acidic, and the problem of environmental pollution due to discharge remains. Moreover, the above coagulant did not react with general public tap water or water with a low degree of pollution, and it worked against considerably contaminated waste water. In addition, in the conventional activated sludge method,
When wastewater containing animal spoilage organic matter is treated by this activated sludge method, the quality of the treated water obtained by this treatment satisfies the standard value that can be discharged, but PH is acidic, BOD, COD is The water quality was not sufficient in the sense that it was harmless to natural waters, such as odor was not completely removed at about 30 to 60 ppm.
Further, the treated water was not suitable for reuse as factory water, cleaning water, or the like. Furthermore, it is necessary to keep the activated sludge tank at 20 to 30 ° C where microorganisms can reproduce, and at the same time to constantly aerate for oxygen supply, and it is necessary to prepare conditions such that organic matter must exist in an appropriate amount. The processing time was quite long. Further, complicated and large-scale equipment is required, the equipment cost is large, and the maintenance cost and labor are excessive.

(Problems to be Solved by the Invention) The present invention prevents the risk of environmental pollution due to discharge of treated water by reacting with neutrality or alkalinity, and can react with general public tap water or similar water. The present invention provides a flocculant which has reactivity, exhibits a sufficient function with an extremely small amount of use as compared with the conventional one, and has a fast floc formation and a high separation rate. Further, the present invention provides one powerful method for solving the problem of treating garbage incineration ash by utilizing the garbage incineration ash.

(Means for Solving the Problem) The present invention is a flocculant obtained by mixing and dissolving raw garbage incinerated ash, animal bone powder and zinc with sulfuric acid or hydrochloric acid, and water, and a method for producing the same.

Raw garbage is the garbage discharged in daily life, and the organic matter, ignition loss component, humic acid,
Residues (silicon dioxide), metals and harmful metals, etc. are included.

As the organic waste incineration ash of the present invention, organic waste incineration ash substantially free of harmful heavy metals is preferable. This incinerator ash powder that does not contain harmful heavy metals is alkaline, and the ash powder that incinerates garbage does not contain harmful heavy metals (mercury, cadmium, lead), or is burned while removing the heavy metals when incinerating the garbage. Fired ash powder obtained by, for example, incineration ash powder obtained by incineration while adsorbing mercury, cadmium, lead, chromium, etc. in the presence of an adsorbent that adsorbs heavy metals, and if necessary, chromium etc. It was added.

The garbage incineration ash that does not substantially contain harmful heavy metals in the present invention is usually 0.05 m of alkyl mercury per 1 kg of garbage incineration ash.
g or less, cadmium 1 mg or less, lead 10 mg or less, hexavalent chromium 5 m
It is g or less, preferably incinerated ash powder in which these heavy metals are not detected.

In the present invention, this incinerated ash is usually used as a raw material of the flocculant in a form dissolved in sulfuric acid or hydrochloric acid, and mixed with animal bone powder, zinc and water to prepare the flocculant.

The proportion is usually 100 to 550 parts by weight of animal bone powder, incineration ash is 100 to 550 parts by weight, preferably 150 to 400 parts by weight, incineration to increase the aggregation rate when the amount of incinerated powder is less than 100 parts by weight. The effect of ash decreases, and when it exceeds 550 parts by weight, the aggregating effect of animal bone powder decreases.

The total amount of animal bone powder and incinerated ash in the flocculant varies depending on the amount of sulfuric acid or hydrochloric acid in the liquid, but in any case, these are not more than the amount that can dissolve in the liquid at room temperature.

As animal bone powder, bones that have been mostly discarded in the past at livestock farms, especially bones of animals mainly composed of hard bones such as cows, horses, and sheep, are adopted.

Raw bones of these animals are cut into a size that is easy to incinerate,
Then put into a pressure cooker and boil at about 200-400 ° C for about 90 minutes. Then put this bone in a firing furnace, 900-1100
Bake for about 60 to 180 minutes at about ℃, and let it cool in the furnace for about 60 minutes to return to room temperature or a state close to this.

It is important to remove the organic substances such as gelatin, fats, proteins, and glues other than the bone components remaining in the bones because they may cause oxidative rot. By the boiling step, organic substances adhering not only to the outside but also to the pores can be largely separated and removed from the bone.

By passing through the above-mentioned baking step, the remaining organic substances can be completely removed, and at the same time, the humidity (moisture) in the bone can be reduced to several% or less, preferably to almost 0%. According to the above-mentioned firing conditions, the original tissue state in which the bone is whitened and has numerous pores is maintained.

After firing and cooling as described above, the bone is crushed and powdered into a powdery bone meal of about 20 to 200 mesh, particularly preferably 50 to 100 mesh.

In the case of bovine bone, the bone meal can be obtained in a yield of about 40% by weight as compared with raw bone as a raw material. Particles are mainly composed of calcium (about 33% by weight), phosphorus (about 16.7%), barium (about
1.03%), sodium (about 0.76%), sulfur (about 0.64)
%) In addition to magnesium, potassium, chlorine, amine, iron, etc., and countless micropores are continuously present inside and outside the particles. This bone meal is alkaline because it contains calcium.

Animal bone meal as it is or as a solution of sulfuric acid or hydrochloric acid is mixed with other raw materials and used for the preparation of the flocculant.

In the present invention, zinc is contained as one of the components of the flocculant, and this zinc is also used as it is or as a solution of sulfuric acid or hydrochloric acid, but it is usually used in the state of the latter solution. Water is used to dissolve powder such as incinerated ash and to adjust the concentration.

The flocculant of the present invention is neutral or alkaline and reacts effectively. Therefore, for wastewater in which PH is acidic,
In order to make it neutral or alkaline, it is preferable to use an alkaline reaction agent such as sodium hydroxide or calcium hydroxide mixed with the waste water together with the coagulant. Also
When the pH is 9.5 or more, it is preferable to use an acidic reactant such as dilute sulfuric acid.

The flocculant of the present invention is obtained by mixing and dissolving the above-mentioned raw material components, but normally, an incinerator ash solution obtained by dissolving raw garbage incineration ash substantially containing no harmful heavy metal in sulfuric acid or hydrochloric acid is used. It is prepared by mixing the solution with animal bone meal, zinc and water and homogenizing. After mixing, it is preferable to heat and stir, and then filter to separate the insoluble matter and recover the solution as a flocculant.

One mode of producing the aggregating agent is as follows. 700 g of garbage incineration ash that does not substantially contain harmful heavy metals is dissolved in concentrated sulfuric acid, and 300 g of beef bone powder and 20 g of zinc (dissolved in sulfuric acid) are added with 50 l of water. Heat is generated when water is added. At 180 ° C
The mixture is boiled for 30 to 60 minutes with stirring until the total amount becomes about 1 kg, and then filtered to obtain a flocculant.

(Effects of the Invention) The flocculant of the present invention uses the incineration ash of garbage, and can be one of the powerful means for solving the problem of incinerating ash of garbage.

The flocculant of the present invention is epoch-making, and since it reacts with neutrality or alkalinity, it is possible to prevent the risk of environmental pollution due to the discharge of treated water. It can be applied to water and can exert a sufficient function with an extremely small amount of use as compared with the conventional one, and can achieve a remarkable effect that the formation of flocs is fast and the separation speed is high.

(Example) Production of flocculant 700 g of garbage incineration ash was dissolved in concentrated sulfuric acid, and 300 g of beef bone powder and 20 g of zinc (dissolved in sulfuric acid) were added with 50 l of water. The addition of water caused an exotherm. The mixture was boiled at 180 ° C. for about 45 minutes with stirring until the total amount became about 1 kg, and then filtered to obtain a flocculant.

Flocculant test Drainage from gas stations (mainly drained after car wash) was taken, placed in a test tube for 8 minutes, and alkali powder was added to neutralize PH. When ~ 2 drops were added and shaken, flocs were formed 10 seconds after the addition of the coagulant, and at the same time, oil and flocs were separated on the upper part of the test tube and an aqueous layer was separated on the lower part.

For comparison, when a sulfuric acid band was added instead of the above flocculant and shaken, it took 30 seconds to form flocs,
Then, it took 30 minutes for separation, and oil was separated in the upper part, an aqueous layer was separated in the middle part, and flocs were separated in the lower part.

Claims (4)

(57) [Claims] 1. A flocculant obtained by mixing raw incineration ash, animal bone powder and zinc with sulfuric acid or hydrochloric acid and water and dissolving them. 2. When the coagulant according to claim 1 is used in treated water treated with the coagulant, an alkaline reactive agent is added to the treated water before use. A method of using the aggregating agent according to item (1). 3. A method for producing a flocculant, which comprises obtaining an incineration ash solution in which raw garbage incineration ash is dissolved in sulfuric acid or hydrochloric acid, and mixing this solution with animal bone meal, zinc and water to homogenize them. 4. The method for producing a flocculant according to claim 3, wherein the mixture is heated, stirred, and then filtered to recover the filtrate as a flocculant.