JPH0620542B2 - Method for manufacturing wastewater treatment agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for producing a wastewater treatment agent, more specifically, aluminum industry, ceramic industry, fertilizer industry, plating industry, semiconductor industry wastewater, waste, sludge incinerator wastewater, Flue gas cleaning water, wet exhaust gas desulfurization wastewater, biotreatment wastewater by biofilm method, municipal wastewater,
The present invention relates to a method for producing a wastewater treatment agent for removing phosphorus, fluorine, etc. remaining in domestic wastewater, industrial wastewater, and the like.

[Conventional technology]

In addition to the calcium coagulation method, iron and aluminum coagulation method, there are physicochemical methods such as adsorption method, electrolysis method, reverse osmosis method, etc. as a treatment method of wastewater containing fluorine. However, the calcium coagulation method has an insufficient fluorine removal rate, and the iron and aluminum coagulation method is costly and
Waste sludge increases.

Further, the phosphoric acid apatite method has a high removal rate, but the chemical cost of phosphoric acid is high. Phosphate ions are said to cause eutrophication even when present in water in an amount of 0.01 to 0.02 mg / (as p). Therefore, it is desired to develop a treatment method that can remove phosphate ions efficiently to a low concentration and that is more reliable.

As a method for treating phosphorus-containing water, there is a crystallization method. In this crystallization method, a soluble calcium salt is added to phosphorus-containing water, the pH is adjusted to 7 or higher, and then water is passed through a column filled with phosphate ore to precipitate and remove phosphate ions in the water as calcium phosphate on the phosphate rock surface. Is the way to do it.

This method is a very effective method, but has a drawback that it is strongly influenced by carbonic acid.

[Problems to be Solved by the Invention]

An object of the present invention is to solve the various problems associated with the various wastewater treatment methods described above and to provide a method for producing a wastewater treatment agent capable of simultaneously removing water pollutants such as phosphorus and HF.

[Means for Solving the Problems]

According to the present invention, one or more substances selected from the group of substances capable of supplying a sulfate compound, a halogen element compound and a sulfide are added to a substance capable of supplying calcium oxide, silicon dioxide and aluminum oxide, at room temperature to 100 ° C. or lower. The method for producing a wastewater treatment agent is characterized in that hydration treatment is carried out at the temperature.

Examples of the substance capable of supplying calcium oxide of the present invention include quick lime, slaked lime, lime carbonate, cement, slag, dolomite plaster (containing lime), and by-products such as acetylene slag.

Materials that can supply silicon dioxide include, for example, silicon, hydrous silicic acid, metasilicic acid, aluminum silicate, calcium silicate and cristobalite, tridymite, kaolin, bentonite, talc, perlite, silas, diatomaceous earth, glass, fir shell ash, Examples thereof include compounds containing reactive silicon dioxide such as incineration ash such as wood ash.

Examples of substances that can supply aluminum oxide include alumina, aluminum hydroxide, aluminum silicate, alum sulfate, alum, aluminum sulfide, aluminum sulfate, aluminum chloride, calcium aluminate, bentonite, kaolin, diatomaceous earth, theolite, , Perlite, bauxite, sodium aluminate, cryolite, and other compounds containing reactive aluminum.

The substance capable of supplying a sulfuric acid compound or a halogen element compound is a substance produced by combining an alkaline earth metal such as calcium and magnesium, an alkali metal such as sodium and potassium, and sulfuric acid and hydrogen halide, and calcium sulfate. , Magnesium sulfate, calcium chloride, magnesium chloride, sodium sulfate, calcium sulfite, calcium hydrogen sulfate, sodium chloride, strontium chloride, calcium bromide, calcium iodide,
Examples include potassium chloride, sodium thiosulfate, sodium hydrogen carbonate, calcium hydrogen carbonate and the like.

Examples of substances that can supply sulfides include calcium sulfide, iron sulfide, and zinc sulfide.

Furthermore, the case where the required materials described so far are supplied by, for example, adding elemental sulfur to promote mutual reaction between the materials, resulting in formation of calcium sulfide, calcium sulfate, etc. Be done.

In addition, as examples of other substances capable of simultaneously supplying two or more kinds out of at least four kinds of compounds described, coal ash and volcanic ash, coal fluidized bed combustion ash (calcium oxide, silicon dioxide, aluminum oxide, calcium sulfate, sodium sulfate) , Source of potassium sulfate, Table 2 shows one example), Cement and cement clinker (calcium oxide, silicon dioxide, aluminum oxide source), slag and silas, andesite, chert, quartz trachyte, opal, zeolite, feldspar ，
Viscous minerals, minerals containing reactive silicon dioxide such as ettringite (calcium sulfate, silicon dioxide, aluminum oxide, calcium oxide), sodium, aluminum, calcium, etc. and chlorides, sulfates, etc., as well as fluidized bed combustion ash, etc. Wastes such as in-furnace desulfurized ash and used desulfurization agent after flue gas desulfurization, sludge incineration ash, municipal waste incineration ash, cement waste, acetylene slag, used wastewater treatment agent, etc. can be mentioned.

Here, the used desulfurizing agent is CaO, Ca (OH) ₂ , CCO shown in JP-A-60-209038 as a used desulfurizing agent such as CaCO _2.
A used desulfurizing agent composed of aO, Al ₂ O ₃ , SiO ₂ and CaSO ₄ type composition.

Further, the waste material at the time of producing the wastewater treatment agent of the present invention, waste or pulverized unused wastewater treatment agent, wastewater containing unreacted substances, exhaust gas treatment agent, etc. may be two or more of the above four compounds. It can be a substance that can be supplied at the same time. For this reason,
Material loss in the manufacturing process can be greatly reduced.

Table 2 shows an example of the chemical composition of these typical substances.

The basic substances involved in the wastewater treatment of the present invention are CaO, Al ₂ O ₃ and Si.
It is O ₂ , Me ^* . Of these, Me ^* is determined by the raw material for producing the wastewater treatment agent of the present invention. For example, when CaCl ₂ is used, it becomes CaO, Al ₂ O ₃ , SiO ₂ and CaCl ₂ , respectively.

The basic substances involved in wastewater treatment are by no means simply composed of a mixture of pure substances, and when Me ^* is CaSO ₄ , unclear XCaO ・ Al ₂ O ₃・ ZSiO ₂・ YSO ₃・ nH ₂ It is suggested that it may be a substance very similar to the sulfuric acid / calcium aluminate complex compound represented by O.

In this formula, X = 4 to 7, Y = 2 to 4, X is larger than Y and Z = 0.1 to 3 is preferably 0.3 to 1, and n is 5 to 22. (GB patent 1115482), but nothing is said about wastewater treatment.

The ettringite used in the form of a paper coating aqueous paste is composed of the following formula without SiO ₂ .

3Ca0 ・ A ₂ lO ₃・ 3CaSO ₄・ 31 ~ 32H ₂ O However, since this etrigite has a low ability to purify wastewater and the strength of the compound is low, its value as a wastewater treatment agent is small. _{However, CaO, Al 2 O 3,} SiO 2, CaSO 4 based compounds which SiO ₂ has been incorporated in the present invention is capable of hard and fine particle of the performance of dephosphorization like is drastically increased. Crystals of Ca (OH) ₂ in the wastewater treatment agent at this time cannot be detected by the X-ray diffraction method.

It is CaO in terms of oxides that absorbs and fixes substances such as phosphorus, but the effect of each pure substance on the performance of the wastewater exhaust gas treatment agent that has been built up is that SiO ₂ contributes to the sustainability of performance.
Al ₂ O ₃ helps to increase the reaction rate with phosphorus and the like, and a hard substance can be obtained by SiO ₂ , CaO, Al ₂ O ₃ and CaSO ₄ . At this time, CaSO ₄ seems to have a role of promoting the synthetic reaction of the mixture.

The wastewater treatment agent of the present invention comprises, in combination with the above materials, at least 1% as CaO, 1% as SiO ₂ , 1% as Al ₂ O ₃ , 1% as a sulfuric acid compound, a halogen element compound and / or 0.1% as a sulfide, preferably 1 as CaO. to 80% SiO ₂ as 5~90% Al ₂ O ₃ as 5~90% CaSO _4, NaSO _4, which CaCl _2, one or more kinds of NaCl is used as 0.1 to 50% CaS is 0.1 to 50% Is. Also, curing, crushing,
The apparatus used for each step such as sizing may be any known method or a combination thereof.

The present inventor has various combinations of the above-mentioned materials (including calcium oxide, silicon dioxide, aluminum oxide, sulfuric acid compounds, halogen element compounds, sulfides, substances produced by the reaction of the materials of the present invention alone or by mutual reaction), The present invention has been completed by finding that when mixed with water and cured, unexpected performance is exhibited depending on the combination and the preparation method.

The used wastewater treatment agent is not simply a feed material for CaCl ₂ , CaSO _4, etc., but is activated by a high concentration of lime-alkali containing crystalline silicon dioxide and aluminum oxide during the curing process of the wastewater treatment agent. It has been found that it is an optimum substance as a raw material for a wastewater treatment agent because it changes into an amorphous substance rich in water and contains chlorides and the like. That is, Si
In the case of O ₂・ CaO ・ Al ₂ O ₃・ Me ^* wastewater treatment agents, the amorphous silicates in substances such as coal ash are generated by the progress of the hydration reaction based on the interaction of each material during the production. ， Reactive Al
_By hydrating ₂ O ₃ with CaO → Ca (OH) _{2, 3} CaO
It appears that double salts similar to ettringite crystals, such as Al ₂ O ₃ · 3CaSO ₄ · 32H ₂ O, are formed, and this substance has a significant effect on wastewater treatment.

Next, the production of the wastewater treatment agent of the present invention will be described. If necessary, the above starting material is pulverized and mixed, and then water is added and mixed. The water-soluble salts in the raw material are preferably used by dissolving them in water to be added. The water content of the raw material mixture after the addition of water is 20 to 2000 parts by weight, preferably about 30 to about 1000 parts, per 100 parts by weight of the dry matter. This water naturally contains water derived from the raw materials, so that the addition of water may be unnecessary by using dilute sulfuric acid, dilute hydrochloric acid or the like.

Next, the mixture is hydrated. The hydration treatment in the present invention refers to a treatment necessary for promoting the hydration reaction between the above-mentioned various substances (raw materials), and includes wet air curing at room temperature to 100 ° C. or less and underwater curing.

In the curing process, after a sufficient amount of water necessary for the production of the active substance in the treatment agent is given, the important step of active compound formation necessary for purification of wastewater is completed, Are consumed in the compound formation reaction.

Non-consolidating hydration treatment, which is a curing in water, refers to a treatment that prevents the materials from binding to each other during the hydration treatment to grow into coarse particles, and the solid-liquid ratio at the start of treatment is increased, For example: 1: 1
It is 1:20. In hot water curing, the raw material is dispersed in water at 40 ℃ ~ 100 ℃, and stirring, bubbling, circulation, shaking, etc. are performed for several minutes to several days so that the raw material does not precipitate and harden at the bottom. is there.

The curable hydration treatment is wet air curing, and by making the solid-liquid ratio at the time of kneading small, for example, 1: 0.2 to 1: 0.99, the bonding between the material particles is promoted and the cured product is The hydration treatment to obtain.

Wet air curing is performed at a temperature of 10 ℃ to 40 ℃ and relative humidity of 50 to 100%.
It is preferably several minutes or several tens of days, and in curing at a higher temperature, a temperature of 40 ° C. to 100 ° C. and a relative humidity of 100% is preferably several minutes to several days.

The cured product after curing may be crushed into coarse particles (about 0.5 mm to several tens of mm, crushed into fine particles (about 0.5 mm or less and several tens of microns or more)) by adjusting the water content as necessary and by a conventional method. obtain.

Non-consolidating hydration slurry-like substance (ultrafine particles,
(Less than a few microns) can be used as is for wastewater treatment.

Curing for obtaining coarse particles and fine particles can also be performed in the following two stages.

The conditions of the first stage wet air curing are preferably a temperature of 10 ° C. to 40 ° C. and a relative humidity of 50% to 100% for several minutes to several days. The high temperature curing is preferably performed at a temperature of 40 ° C to 100 ° C and a relative humidity of 100% for a few minutes to a few days.

This first-stage curing is suitable for easily molding and granulating a mixture in which a partial hydration reaction is progressing from a fine particle size to a coarse particle size, or crushing a cured product after completion of the curing. It is performed under the condition that it is in a moisture state and a cured state.

That is, the curing in the first stage is to promote the hydration reaction for forming the active compound in the initial stage necessary for molding and granulating the raw material mixture. Activated wastewater / exhaust gas treatment agent, fluidized bed combustion ash, etc.
When a substance containing CaSO ₄ , SiO ₂ , Al ₂ O ₃ , CaCl ₂ or the like is used, or when a self-hardening substance such as cement is added, hydration, heat generation and decomposition like CaO should be performed. When such a substance is used, the initially added material may change or become finely powdered, and the temperature of the mixture during kneading may rise, and the hydration reaction may significantly progress even during kneading of the raw materials. is there. For this reason, it is possible to obtain an appropriate moisture state for forming and granulating, which is the object of the first-stage curing proposed by the present invention. When the hydration reaction remarkably progresses during kneading as described above, the first stage curing can naturally be omitted.

Next, the material that has been cured in the first stage has been subjected to a molding (granulation) process by a briquette machine, a pelletizer, etc., if desired, so that the particle size that can be dispersed in or contact with the waste water can be easily and yielded. Well obtained. The molded product can be subjected to the second stage curing and sized to obtain the wastewater treatment agent used in the wastewater treatment of the present invention.

The second stage of curing is 10 ° C-40 ° C, relative humidity 50%-
It is preferably for several minutes to several tens of days in 100% humid air, and for curing at a higher temperature, the temperature is 40 ° C to 100 ° C and the relative humidity is 100%, and several minutes to several days are preferable.

When a coarse-particle or fine-particle wastewater exhaust gas treating agent is produced by one-time curing, it is carried out in the same manner as in the second stage of the previous term.

Crushing of hardened material which is wet or dried, compression molding of crushed material and dried material of slurry-like substance are generally used for marumerizer, disk pelleter, briquette machine, tablet molding machine, extrusion molding machine, etc. It can be performed by a pressure formable device.

The molding pressure varies depending on the application of the agent and the shape of the molded product (tablet shape, plate shape, honeycomb shape, Raschig ring, etc.), but in the case of relatively large particles packed in layers, 10 kg / cm ^{2 to} 10 t /
cm ^2, when preparing the particles of 0.01 to several mm, the number Kg / cm ² ~
It is several t / cm ² .

In compression molding, particles of several millimeters such as ultrafine particles, fine particles, and coarse particles, and particles of about 10 mm can be similarly molded without adding a binder. When the curing of the coarse and fine particulate wastewater treatment agent is performed by dielectric heating, heating from the inside is possible.
The curing time can be completed significantly faster than the usual external heating method.

The contact of the wastewater treatment agent by the production method of the present invention with the wastewater is as follows. As a method of contacting the waste water with the coarse particles obtained by subjecting the hardened material to coarse particles or compression molding, a wet or dry tens of μm to tens of mm particulate waste water treatment agent is used as the moving layer or fixed layer. Packed in layers, etc., and contact the wastewater through. In the case of fine particles, the contact area is increased by suspending the relatively large particles of the agent by the force of the wastewater flow, and the collision between the agent particles induces the exposure of a new surface of the agent, thus improving the performance. Improve. At this time, the agent should be dispersed as widely as possible in the wastewater.

In the case of non-consolidated hydrated ultrafine particles, high water content slurry is sprayed as it is by a general method to disperse it as much as possible into the waste water, and the contact area with the waste water is increased to make the waste water effective. Can be processed as desired.

In the treatment of wastewater that is dispersed or suspended in wastewater, the reacted portion of the treatment agent is peeled and abraded by the mutual contact and collision of the particles, and the strength such that the particle size of the agent decreases as the treatment reaction proceeds, It is preferable that the waste water treating agent in the form and the agent that is extracted after the reaction is completed have a difference in particle size from the newly supplied agent. The collection of the treatment agent dispersed and suspended in the wastewater after the wastewater treatment can be recovered by filtration, centrifugal filtration, vacuum filtration, sedimentation method or other general solid-liquid separation method. The recovered wastewater treatment agent can be repeatedly used until there is no unreacted material.

Furthermore, the wastewater treatment agent according to the production method of the present invention is
Leachables from the bottom sediments of sea areas, sedimentation ponds and lakes can be treated. This is done by covering the surface area of the bottom sediment with a wastewater treatment agent. The surface region is the surface of the deposit and a region from the surface to the depth direction up to about 1 m. As a specific treatment method, the surface of the deposit is covered with a particulate or fine particulate wastewater treatment agent, or the treatment agent is mixed in the surface layer of the deposit.

The amount of the treating agent used at this time should be at least 10 cm of the laminated thickness on the surface of the deposit.
It is 5 g to 600 g per cm ² .

Preferably, the laminated thickness is about 6 cm from the bilayer grain, and its weight is 10 g to 400 g per 10 cm ² . When the agent is mixed in the surface layer of the deposit, the amount is 5 cm to 300 g at the surface of the deposit of 10 cm ² and the depth of 5 cm, preferably 50 g to 300 g at the depth of 50 cm.
The spraying of the deposit on the surface or the mixing of the deposit on the surface layer can be performed by an existing technique.

In this way, when the wastewater treatment agent according to the production method of the present invention is laminated in such a manner that the surface of the deposit is covered with a lid, it is possible to absorb and fix harmful substances such as P and F that migrate from the deposit to the water area, and thus the surface layer When mixed into the parts, absorption and fixation of harmful substances emitted from the deposits and modification effects due to the progress of the reaction between the agent and the deposits can be expected to have a long-term stable effect of inhibiting the release of harmful substances.

Examples will be described below.

〔Example〕

Example 1 Various materials shown in Table 2 are mixed by adding water according to the formulation shown in Table 3. Next, curing was performed in hot water of 95 to 100 ° C. for 12 hours while stirring so that the mixture did not precipitate, to obtain a slurry-like wastewater treatment agent of the present invention. This is Example 1-1. Next, a part of the slurry was centrifugally dehydrated to obtain a cake having a water content of 40%, and the cake was molded at a pressure of 480 kg / cm ² to obtain a wastewater treatment agent of coarse particles having a particle size of 0.5 to 1 mm. This is Example 1-2. Further, a part of the slurry is dried and
Molding was performed at a pressure of 40 kg / cm ² to obtain a wastewater treatment agent of coarse particles having a particle size of 0.5 to 1 mm. This is Example 1-3. Examples 1-1,1-
The water contents of 2,1-3 were 200%, 35, and 1%, respectively.

The chemical composition of the wastewater treatment agent of Example 1 is shown in Table 4.

Next, the wastewater treatment performance of the wastewater treatment agents of Examples 1-1, 1-2, 1-3 will be described.

In Example 1-1, the performance test was conducted by the spray method. That is, simulated wastewater (composition shown in Table 5) at a temperature of 25 ° C was flowed at a rate of 10 cc / min from the bottom to the top of a plastic cylindrical absorption tower with an inner diameter of 70 mm and a height of 1000 mm, and the tower was placed in this running water. 40 g (dry matter conversion value) of the wastewater treatment agent of Example 1-1 from the bottom of the
The slurry at a temperature of 25 ° C suspended in the mixture is spray mixed at a rate of 1 cc / min to separate the agent and water overflowing from the top of the tower, and the target components to be removed in the separated water, namely phosphorus, fluorine and hydrogen sulfide. , Ammonia, chlorine, etc. were analyzed and the removal rate was calculated. These results are shown in Table 6 together with the value of the specific surface area obtained by the BET method after degassing the treatment agent before the test at 200 ° C.

In Examples 1-2 and 1-3, the performance test was performed by the fixed layer method.
That is, a Pyrex cylinder with an inner diameter of 80 mm and a height of 500 mm was used as an absorption tower, and the wastewater treatment agent was 100 m (37 g dry matter equivalent).
, The simulated wastewater was flown from the upper part to the lower part at a space velocity of 6 h ⁻¹ at 0.6 / h, and the removal components in the outflow water 10 hours after the start of the running water were analyzed to calculate the removal rate. It is shown in Table 6 together with the value of the specific surface area.

Example 2 The various materials shown in Table 2 are mixed with water according to the formulation shown in Table 3. Curing was carried out in hot water of 98 ° C. for 2 hours and 12 hours while continuously agitating so as not to precipitate, and floating in the liquid. The slurry thus obtained as it is (water content of 200%) was used in Example 2-1 (cured for 2 hours),
It was used as the treatment agent of Example 2-2 (12-hour curing product).

In addition, the white fine particles obtained by centrifugally dehydrating the slurry of Example 2-2 and then drying it (water content 9%)
Example 2-3, molded at a pressure of 640 kg / cm ² (particle size 0.5 to 1 mm)
The obtained coarse particles (water content 4%) were used as the treating agent of Example 2-4. The chemical composition is shown in Table 4.

Examples 2-1, 2-2, 2-3 are spray methods similar to Example 1-1, Example 2-4 is a performance test with a fixed bed method similar to Example 1-3, The results are shown in Table 6 together with the specific surface area values.

Example 3 Various materials shown in Table 2 are mixed with water according to the formulation shown in Table 3. Heat at 95-100 ° C in the presence of water and cure for 12 hours. Hardened material is crushed (particle size is
Coarse particles having a size of 0.5 mm to 1.0 mm, Example 3-1) or pulverization (fine particles having a particle diameter of about 0.5 mm or less, Example 3-2). The water content was 30% in each case.

The performance test of Example 3-1 was performed by the floating method. That is,
A plastic cylinder with an inner diameter of 70 mm and a height of 1000 mm was used as an absorption tower, and simulated waste water (composition shown in Table 5) at a temperature of 25 ° C. was flown upward from the bottom at a rate of 10 m / min. A slurry prepared by suspending 100 g of steam coarse particles in water 2 is injected at a rate of 1 m / min to make the coarse particles in a floating state by the kinetic energy of the simulated waste water and contact the waste water,
The liquid flowing out from the upper part of the tower was immediately subjected to solid-liquid separation, and the target removal component in the separated liquid was analyzed to calculate the removal rate.

For Example 3-2, a performance test was performed in the same manner as in the spray method of Example 1 except that the slurry concentration was changed to 100 g (dry matter conversion value) / water 2.

The results are shown in Table 6 together with the specific surface area.

Example 4 Water is added to and mixed with each of the materials shown in Table 2 according to the formulation shown in Table 3. Heat at 95-100 ° C in the presence of water and cure for 12 hours. The hardened substance was crushed or crushed, dried at 130 ° C. for 4 hours, and crushed to obtain coarse particles (particle size: 0.5 mm to 1.0 mm, Example 4-1) or crushed ultrafine particles (particle size: Several tens of microns or less, Example 4-2), fine particles (particle size of several tens of microns to about 0.5 mm, Example 4-
3) A wastewater treatment agent was obtained. The water content was 1% in each case, and its chemical composition is shown in Table 4.

Example 4-2 is the same spraying method as Example 1-1, Example 4-1 and Example 4-3 are the same floating method as Example 3-1 and the same spraying as Example 3-2. A performance test was conducted by the method, and these results are shown in Table 6 together with the specific surface area.

Example 5 Water is added to and mixed with various materials shown in Table 2 according to the formulations shown in Table 3. Heat at 95-100 ° C in the presence of water and cure for 12 hours. The hardened material is crushed or crushed to form coarse particles (particle size 0.5 mm to 1 mm, Example 5-1), and ultrafine particles and particles at a pressure of 640 kg / cm ² (particle size 0.5 to 1 mm). A coarse particle body (Example 5-2) was obtained. The water content was 30%, and the chemical composition is shown in Table 4.

All performance tests were carried out by the same fixed bed method as in Example 1-2, and the results are shown in Table 6 together with the specific surface area.

Example 6 Various materials shown in Table 2 were kneaded by adding water in accordance with the formulation shown in Table 3, and curing at the first stage was performed at 100 ° C. and humidity of 100.
%, 3 hours, and after granulating with a drum type granulator, the second stage curing is performed at 100 ° C, humidity 100% for 9 hours, and a wastewater treatment agent (particle size 0.5 to 1.0 mm, water content 30%, specific surface area). I got 100).

This treatment was used to test the treatment of effluents from underwater sediments. That is, take 500 ml of 40% slurry (temperature 25 ° C) of the sediment of the domestic wastewater settling basin (concentration of phosphorus of 200 ppm) in a glass container with a diameter of 11 cm and a depth of 15 cm, and let it stand for 10 days. 6 ml of pure water having a temperature of 25 ° C. was poured every hour to cause overflow, and after 4 days, phosphorus in overflow water was analyzed. The elution of phosphorus was not observed when the treating agent was used, whereas the elution concentration of phosphorus was 3 ppm when the treating agent was not used.

[Effect of the invention] The wastewater treatment agent used in the production method of the present invention is mainly composed of a substance capable of supplying CaO, SiO ₂ , and Al ₂ O ₃ unlike the conventional absorbent and adsorbent, so that the raw material is coal. Use of silicates and calcium compounds such as ash, cement, volcanic ash, slag, shirasu, fluidized bed combustion ash, used flue gas treatment agent, used wastewater treatment agent (containing unused wastewater treatment agent), clay There is a wide range of possible and usable ingredients.

Further, it can be manufactured through a simple process such as room temperature wet air curing and hot water curing. The wastewater treatment can be performed by slurry treatment, floating treatment with dry ultrafine particles, compression molded particles, moving bed treatment, fixed bed treatment,
It is possible to adopt a method that matches the specifications of the wastewater and the wastewater generation facility. Further, waste materials such as coal ash, slag, used desulfurizing agent, used wastewater treatment agent, waste glass, fluidized bed combustion ash, etc. can be utilized as a raw material for manufacturing the agent. In addition, the use agent wastewater treatment agent is not only useful as a resource recycling technology such as being able to be reused as an acid gas remover in exhaust gas, but is also contained in wastewater. Since harmful components such as NH ₃ , H ₂ S and Cl ₂ can be removed with high efficiency and at low cost, they are extremely large in contributing to pollution prevention.

Front page continuation (72) Inventor Toshiya Kodama, 461-6 Satozuka, Toyohira-ku, Sapporo, Hokkaido, Hokkaido Electric Power Co., Inc. (72) Hiroaki Doi, 461-6, Satozuka, Toyohira-ku, Sapporo, Hokkaido, Japan (56) References JP-A-57-4227 (JP, A) JP-A-57-1442 (JP, A) JP-A-63-54999 (JP, A) JP-A-52-52460 (JP, A) Kai 63-224788 (JP, A)

Claims (4)

[Claims] 1. A substance capable of supplying calcium oxide, silicon dioxide and aluminum oxide, to which one or more substances selected from the group of substances capable of supplying a sulfuric acid compound, a halogen element compound and a sulfide are added, and the temperature is from room temperature to 100 ° C. A method for producing a wastewater treatment agent, which comprises performing hydration treatment at the following temperature. 2. The method for producing a wastewater treatment agent according to claim 1, wherein the hydration treatment is a non-consolidating hydration treatment. 3. The method for producing a wastewater treatment agent according to claim 1, wherein the hydration treatment is a curable hydration treatment. 4. A molded body as it is, after being hydrated or after being dried, or after being crushed and crushed, to obtain a molded body.
A method for producing the wastewater treatment agent described.