JPH047004A - Coagulant and production thereof - Google Patents

Abstract

PURPOSE:To prevent the possibility of environmental pollution due to the effluence of treated liquid by mixing ashes of burnt garbage, powdered animal bones and zinc with sulfuric acid or hydrochloric acid and water to dissolve the aforesaid matter in such liquids. CONSTITUTION:A coagulant is obtained by mixing ashes of burnt garbage, powdered animal bones and zinc with sulfuric acid or hydrochloric acid and water to dissolve the aforesaid matter in such liquids. To prepare this coagulant, the ashes of burnt garbage are dissolved in sulfuric acid or hydrochloric acid to obtain a solution of the ashes and the powdered animal bones, zinc and water are mixed with this solution and such mixture is made homogeneous.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides an animal bone-containing flocculant using garbage incineration ash;
and its manufacturing method.

(Conventional technology) A new culture has been created by modern industry and industry developed by mankind, but on the other hand, it has had a great impact on the natural environment, causing destruction and pollution of nature that exceeds the purification effect of nature. It has occurred.

In order for humankind to always maintain a healthy and cultured life, it is necessary to remove the negative effects of industrial development and create a new environment suitable for the development of life. The problem of garbage incineration ash disposal is a problem not only in Japan but also in countries around the world.

Various related organizations in various countries are conducting various studies on this issue of garbage incineration ash disposal, but at present no fundamental solution has been found.

On the other hand, sulfuric acid, aluminum chloride, ferric chloride, and the like are conventionally known as flocculants that flocculate organic matter in wastewater. Furthermore, wastewater containing organic matter has usually been treated by an activated sludge method. However, all conventional flocculants react on the acidic side, and the treated water inevitably becomes acidic, leaving the problem of environmental pollution due to discharge.

Moreover, the above-mentioned flocculants did not react with general public tap water or water with a low degree of contamination, but functioned with considerably contaminated wastewater. In addition, in the conventional activated sludge method, when wastewater containing putrefactive organic matter of animal origin is treated with this activated sludge method, the quality of the treated water obtained by this method satisfies the standard value that allows it to be discharged. , PH is acidic, B
Both OD and COD were about 30 to 60 ppm, odor was not completely removed, and the water quality could not necessarily be said to be sufficient in terms of being harmless to natural water bodies. Furthermore, the above-mentioned treated water was not suitable for reuse as factory water, washing water, or the like. Furthermore, it is necessary to maintain conditions such as keeping the activated sludge tank at a temperature of 20 to 30°C where microorganisms can reproduce, and at the same time, aeration is required to supply oxygen at all times, and an appropriate amount of organic matter must be present. , the processing time was quite long. Further, complex and large-scale equipment is required, and the equipment cost is large, and the maintenance cost and labor are also excessive.

(Problems to be Solved by the Invention) The present invention aims to prevent the risk of environmental pollution caused by the discharge of treated water by reacting with neutral or alkaline water, and which reacts with general public tap water or water of the same level. Along with having gender,
The purpose of this invention is to provide a flocculant that exhibits sufficient functionality with an extremely small amount used compared to conventional ones, and that forms flocs quickly and has a high separation rate. Furthermore, the present invention provides an effective method for solving the problem of garbage incineration ash disposal by utilizing garbage incineration ash.

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

Food waste is waste generated in daily life, and food waste incineration ash usually contains organic matter, ignition loss components, humic acid, residue (silicon dioxide), metals, toxic metals, etc.

The garbage incineration ash of the present invention is preferably garbage incineration ash that does not substantially contain harmful heavy metals. This garbage incineration return powder, which does not contain toxic heavy metals, is alkaline and is either the garbage incineration return powder from which toxic heavy metals (mercury, cadmium, lead) have been removed, or the garbage that is incinerated while removing heavy metals. For example, mercury, cadmium, lead, chromium, etc. are adsorbed in the presence of an adsorbent that adsorbs heavy metals, and chromium is then incinerated. It was added.

In the present invention, the garbage incineration ash that is substantially free of harmful heavy metals usually has 0.00% alkylmercury per 1 kg of garbage incineration ash.
05 mg or less, cadmium 1 mg or less, lead 10 mg or less, and hexavalent chromium 5 mg or less, and preferably the incineration powder contains no detectable heavy metals.

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

Somewari usually contains 100 parts by weight of animal bone powder and 100 to 550 parts by weight of incinerated ash, preferably 150 to 400 parts by weight.
If the amount of incinerated powder is less than 100 parts by weight, the effect of incinerated ash to increase the agglomeration rate will be reduced, and 55
If the amount exceeds 0 parts by weight, the aggregation effect of animal bone powder will decrease.

The total amount of animal bone meal and incineration ash in the coagulant will vary depending on the amount of sulfuric acid or hydrochloric acid in the solution, but in any case it will be less than the amount that can be dissolved in the solution at room temperature.

In addition, the animal green powder is made from bones, which have conventionally been mostly discarded at livestock farms, especially bones of animals such as cows, horses, sheep, etc., which are mainly hard bones.

The raw bones of these animals are cut into sizes that are easy to burn, then put into a pressure cooker and heated at around 200 to 400 degrees Celsius for about 90 minutes.
Boil for about 0 minutes. The bones were then placed in a kiln for 90
It is fired at a temperature of about 0 to 1100° C. for about 60 to 180 minutes, and then allowed to naturally cool in the furnace for about 60 minutes to return to room temperature or a state close to this temperature.

If organic substances other than the blue component, such as gelatin, fat, protein, and glue, remain in the bones, they will cause oxidative decay, so it is important to ensure that they are removed. By the above boiling process, organic matter adhering not only to the outside but also to the inside of the pores can be strongly separated and removed from the bone.

By then passing through the above baking process, remaining organic matter can be completely removed, and at the same time the humidity in the bone can be reduced.
The water content can be reduced to several percent or less, preferably to almost 0%. According to the above-mentioned firing conditions, the bone turns into a skeleton and maintains its original tissue state having countless pores.

After the above-mentioned baking and cooling, the bone is crushed and powdered into powder powder to produce approximately 20 to 200 meshes, particularly preferably 50 to 1 mesh.
00 mesh powdered bone meal.

The above-mentioned bone meal is obtained from bovine bones at a yield of 40% by weight compared to raw raw bones. The particles contain calcium (approximately 33
The main components are phosphorus (approx. 167%), barium (approx. 0.3%), sodium (approx. 0.76%), sulfur (approx. 0.64%), and magnesium, potassium, chlorine, and amines. , iron, etc., and countless microscopic pores exist in communication between the inside and outside of the particles. This bone meal is alkaline because it contains calcium.

Animal bone meal is used as it is or as a solution of sulfuric acid or hydrochloric acid, mixed with other raw materials to make flocculant 11i.

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 in sulfuric acid or hydrochloric acid, but the latter solution is usually used. Water is used to dissolve powder such as incineration ash and adjust its concentration.

The flocculant of the present invention reacts effectively in neutral to alkaline conditions. Therefore, for wastewater with an acidic pH,
In order to make the wastewater neutral or alkaline, it is preferable to use an alkaline reactant such as sodium hydroxide or calcium hydroxide mixed with the wastewater at the same time as the flocculant. Further, if the pH is 9.5 or higher, it is preferable to use an acidic reactant such as dilute sulfuric acid.

The flocculant of the present invention can be obtained by mixing and dissolving the above-mentioned raw material components, but usually, an incineration ash solution is obtained by dissolving garbage incineration ash, which is substantially free of harmful heavy metals, in Ta acid or hydrochloric acid. By mixing and homogenizing this solution with animal bone meal, zinc and water, y8! send After mixing, it is preferable to heat and stir, then filter to separate undissolved components, and recover the solution as a flocculant.

One aspect of the production of the flocculant is as follows. Dissolve 700 g of garbage incineration ash, which does not substantially contain harmful heavy metals, in concentrated sulfuric acid, and add 50 g of water to 300 g of beef bone powder, 20 g of zinc (dissolved in sulfuric acid). Generates heat when water is added. At 180℃ for 30-60 minutes, while stirring, the whole
After boiling down to kg, it is filtered to obtain a flocculant.

(Effect of the invention) The flocculant of the present invention utilizes garbage incineration ash,
This could be an effective means of solving the problem of garbage incineration ash disposal.

The flocculant of the present invention is a groundbreaking product, and because it reacts with neutral or alkaline properties, it is possible to prevent the risk of environmental pollution caused by the discharge of treated water. It can also be applied to water, exhibits sufficient functionality with an extremely small amount used compared to conventional products, and achieves remarkable effects such as rapid formation of flocs and high separation speed.

(Example) ■Production of flocculant Dissolve 700g of garbage incineration ash in concentrated sulfuric acid, and dissolve 300g of beef bone powder.
50N of water was added to 20y of zinc (dissolved in sulfuric acid). When water was added, it generated heat. The mixture was boiled at 180° C. for about 45 minutes with stirring until the total weight was about 1 kg, and then filtered to obtain a flocculant.

■Flocculant testing Gas station wastewater (mainly wastewater from car washes)
After taking the water and putting it into a test tube for about 8 minutes, adding alkali powder to make the pH almost neutral, I added 1 to 2 drops of the above flocculant and shook it. 10 seconds after adding the flocculant, Flocs were formed, and almost at the same time, oil and flocs separated from the top of the test tube, and a water layer separated from the bottom.

For comparison, when we added sulfuric acid band instead of the above flocculant and mixed it by shaking, it took 30 seconds to form flocs.
Next, it takes 30 minutes to separate, with oil on the top and water layer in the middle.
The flocs were separated at the bottom.

Claims (4)

[Claims] (1) A flocculant made by mixing and dissolving garbage incineration ash, animal bone meal, and zinc with sulfuric acid or hydrochloric acid, and water. (2) A method for using the flocculant according to claim (1), characterized in that the flocculant according to claim (1) is used as a treatment liquid and an alkaline reactant is added thereto. (3) A method for producing a flocculant, which comprises obtaining an incineration ash solution by dissolving garbage incineration ash in sulfuric acid or hydrochloric acid, and mixing and homogenizing this solution with animal bone meal, zinc, and water. (4) The method for producing a flocculant according to claim (3), wherein after mixing, heating and stirring are performed, followed by filtration and the filtrate is recovered as a flocculant.