JP2003093804A - Purification agent for turbid wastewater and sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of a conventional flocculant that the flocculant does not have sufficient flocculation efficiency in spite of its aim to flocculate and separate suspended solid (SS) in wastewater, that the flocculant has pH dependency to require pH adjustment in some cases for treatment, and accordingly, require pH adjustment again in some cases at the time of releasing the separated water after flocculation treatment of SS in wastewater, and that the sludge left by flocculating and separating SS by the flocculant and dewatering it is easy to be dissolved in water and heavy metals are not immobilized and dissolved again. SOLUTION: This purification agent for turbid wastewater and sludge is an agent containing a crystalline aluminosilicate salt, a sodium salt, an aluminum salt, and a metal oxide, or the purification agent for turned wastewater and sludge is an agent containing a zeolite, aluminum potassium sulfate, sodium carbonate, silicon dioxide, aluminum oxide, calcium oxide, iron oxide and magnesium oxide.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a floating suspended substance contained in various industrial wastewater, sewer polluted wastewater and civil engineering wastewater, septic tank sludge and sewage treatment sludge, and bottom sediments such as lakes, swamps, ponds and rivers. The present invention relates to a purification and treatment agent for polluted wastewater and sludge for adsorbing, fixing and separating heavy metals and dissolved pollutants at the same time as coagulating and separating.

[0002]

2. Description of the Related Art Conventionally, various inorganic and organic flocculants have been used as a purification treatment agent for polluted wastewater. As the inorganic coagulant, aluminum sulfate polyaluminum chloride (PAC), sodium aluminate (NaAlO
_2), iron sulfate _{(FeSO 4 · 7H 2 O)} , iron chloride (FeC
l ₃ · 6H ₂ O) aluminum compound and an iron compound or quicklime such, such as slaked lime is used. As the organic polymer flocculant, polyacrylamide, sodium alginate, etc. are used.

The above-mentioned conventional inorganic and organic flocculants are mainly aimed at flocculating and separating suspended solids (SS) in wastewater, but are capable of removing SS of about 50,000 ppm. Therefore, it cannot be said that it has a sufficient aggregation effect. Also, conventional flocculants have pH dependence,
The appropriate pH varies depending on the treating agent, and pH adjustment may be necessary during treatment. For example, when divalent or trivalent iron salt is used as an aggregating agent, the optimum pH is about 6 to 8. Furthermore, the polyacrylamide type has a cloud point depending on the pH, and the temperature also has a cloud point (60 ° C.). ). Further, in the case of aluminum sulfate, an alkaline component is required to effectively act as a flocculant, and polymerized aluminum hydroxide ions are generated at pH 4 to 5. Moreover, if the addition amount is too large, the surface charge of the SS colloidal particles, which are negatively charged in the waste water, is reversed and dispersed. In other words, the aggregating action of aluminum sulphate is to adsorb negatively charged colloidal particles and neutralize them with a positive charge. However, if they are excessively adsorbed, the SS colloidal particles are positively charged and repelled and dispersed. The aggregation effect cannot be exhibited.

Further, in the case of the conventional inorganic coagulant, when the separated water is discharged after coagulating SS in the waste water,
pH adjustment may be required. For example, aluminum sulfate consumes alkali in water,
H is lowered. Among the inorganic flocculants, polyaluminum chloride (PAC) is an excellent one that does not change the pH of water so much, but polyaluminum chloride is used by dissolving it in water, and SS is adsorbed and cross-linked. The coagulated and separated sludge has a high water content, and it is necessary to drain the dehydrated sludge after treatment.

The organic flocculant is also adjusted to be suitable for the acidic region, the neutral region, and the alkaline region, respectively. When releasing the separated water, it may be necessary to adjust the pH. Furthermore, as described above, sludge that is coagulated and separated by a conventional inorganic or organic coagulant, dehydrated, and solidified is easily dissolved in water, and heavy metals are not fixed, and sludge is not recovered. There were many problems such as elution.

[0006]

In view of the problems in the treatment of polluted wastewater and sludge using the conventional inorganic or organic flocculant as described above, the present invention sufficiently flocculates even in high concentration SS. It is possible to precipitate, and also the pH
Regardless of, it is possible to aggregate and precipitate SS and heavy metals in polluted wastewater and sludge, and there is no need to adjust the pH when releasing the separated water, and the dehydration rate of the dehydrated sludge separated after the treatment is high, That is, the sludge, which has a low water content, can reduce the amount of waste, and is dehydrated and solidified, is difficult to dissolve in water and provides a purification treatment agent in which heavy metals and the like are not re-eluted. .

[0007]

DISCLOSURE OF THE INVENTION As a result of intensive studies to solve the above problems in the prior art, the present invention results in a polluted wastewater and sludge comprising crystalline aluminosilicate, sodium salt, aluminum salt and metal oxide. To provide a purification treatment agent. That is, a purification treatment agent for polluted wastewater and sludge, which is characterized by comprising crystalline aluminosilicate, sodium salt, aluminum salt and metal oxide, wherein the crystalline aluminosilicate is zeolite (xAl ₂ O ₃ ySiO ₂ ), the sodium salt is sodium carbonate (Na ₂ CO ₃ ), and the aluminum salt is aluminum sulfate [Al ₂ (SO ₄ ) ₃ ], aluminum chloride (AlCl ₃ ) and potassium aluminum sulfate [KAl ₂ (SO _{2 4} ) ₂ ], and the metal oxide is silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), calcium oxide (CaO),
Iron oxide (Fe ₂ O ₃ ) and magnesium oxide (MgO)
It is preferable that any one kind or two kinds or more of the above.

The second aspect of the present invention is to use zeolite (xAl ₂ O ₃
ySiO ₂ ), potassium aluminum sulfate [KAl ₂ (S
O _{4) 2],} sodium carbonate (Na ₂ CO _3), silicon dioxide (SiO _2), aluminum oxide (Al ₂ O _3), calcium oxide (CaO), iron oxide (Fe ₂ O ₃₎ and magnesium oxide (MgO ), The content of zeolite is preferably 15 to 45% by weight, the content of potassium aluminum sulfate is preferably 5 to 25% by weight, and sodium carbonate is The content of is preferably 10 to 30% by weight,
The content of silicon dioxide is preferably 5 to 40%, the content of aluminum oxide is preferably 3 to 25%, the content of calcium oxide is preferably 5 to 30%, and the content of iron oxide is 1 to 7% by weight. Is preferable, and the content of magnesium oxide is preferably 1 to 5% by weight.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The purifying treatment agent according to the present invention is
Chemicals and heavy metals that coagulate and separate suspended suspended matter (SS) contained in various plant wastewater, sewer polluted wastewater and civil engineering wastewater, septic tank sludge and sewage treatment sludge as well as bottom sludge in lakes, swamps, ponds, rivers, etc. A chemical that purifies polluted wastewater and sludge for adsorbing, fixing and separating substances and dissolved pollutants. As a conventional purification treatment agent for polluted wastewater, aluminum sulfate polyaluminum chloride (PAC), sodium aluminate (NaAlO) as an inorganic flocculant is used.
_2), iron sulfate _{(FeSO 4 · 7H 2 O)} , iron chloride (FeC
l ₃ · 6H ₂ O) aluminum compounds such as iron compounds or quick lime, slaked lime, etc., polyacrylamide, sodium alginate, etc. as the organic polymer flocculant, can be exemplified.

The zeolite referred to in the present invention is a tectoaluminosilicate having a three-dimensional network structure, and its chemical structure is silicon (Si) and four oxygen (O) existing around it are sp ³ hybrid orbitals. Are formed by forming a silicon tetrahedron and an aluminum tetrahedron (tetracoordinated aluminum) in which aluminum is substituted for the silicon of the tetrahedron as main components, and these tetrahedrons have four elements. It is assembled in a connected form so that the vertices are shared. The general formula of the chemical composition is xAl ₂ O ₃ ySiO
_{Is 2} . The porous structure includes weakly retained water that is easily dehydrated by heating and degassing. Zeolite dehydrated at a low temperature has a selective gas adsorption property and becomes a molecular sieve. Many also have cation exchange capacity. This exchange ability is because a permanent negative charge is generated at the position of tetracoordinated aluminum due to the electrical imbalance between Al and O. Zeolites are stable cation exchangers because the exchange capacity is largely independent of pH. Zeolites include naturally occurring natural zeolite, high-purity synthetic zeolite used for catalysts, and artificial zeolite obtained from waste such as coal ash. The content of the zeolite is preferably 15 to 45% by weight, more preferably 20 to 30% by weight. If the content of zeolite is less than 15% by weight, the radical reaction is weakened and the adsorption rate of heavy metals is reduced, resulting in 45% by weight.
If it exceeds, the ettringite reaction becomes weak. Here, the ettringite (Ca) reaction is a reaction of calcium aluminate with calcium sulfate that is eluted into water due to a hydration reaction with water in a water-containing mud, and the ettringite (Ca
₆ Al ₂ (SO ₄ ) ₃ (OH) ₂ · 26H ₂ O) and a reaction in which calcium silicate hydrate is formed.

The potassium aluminum sulfate [KAl ₂ (SO ₄ ) ₂ ] used in the present invention is most commonly obtained as a dodecahydrate at room temperature, and is called alum, potassium alum, potassium alum, etc. ^It is used as a colloid coagulant by utilizing the property of ³⁺ ions. The content of potassium aluminum sulfate is preferably 5 to 25% by weight, more preferably 10 to 20% by weight. If the content of potassium aluminum sulfate is less than 5% by weight, the generation of base is reduced, and it becomes difficult to exert the precipitation action of silicate. Pozzolanic reaction cannot be fully exerted. Here, the pozzolanic reaction is mainly composed of amorphous silica such as pozzolan or acid clay, contains soluble silicon dioxide and aluminum oxide, reacts with calcium hydroxide in water, and is insoluble Ca-Si-H ₂ O gel and Ca-A
1-H ₂ O refers to a reaction that produces a gel.

The content of sodium carbonate used in the present invention is preferably 10 to 30% by weight, more preferably 15 to 25% by weight. When the content of sodium carbonate is less than 10% by weight, the amount of sodium salt is small and the precipitation is delayed. Further, when the content of sodium carbonate exceeds 30% by weight, the neutralizing action becomes excessive and the pH rises.

The content of silicon dioxide used in the present invention is 5
-40% by weight is preferable, and 20-30% by weight is more preferable. If the content of silicon dioxide is less than 5% by weight, the ettringite reaction does not occur, and if the content of silicon dioxide exceeds 40% by weight, the radical reaction becomes weak.

The aluminum oxide used in the present invention becomes colloidal in water, promotes a decrease in the potential between SS colloidal particles, disintegrates the particles, atomizes them, and forms a hydrophobic coagulation body. Can be aggregated and precipitated. In addition, the dehydrated sludge separated after the treatment has a high dehydration rate, that is, a low water content, and waste can be reduced. Moreover, the dehydrated sludge after treatment is difficult to dissolve, and heavy metals and the like do not re-elute. The content of aluminum oxide is preferably 3 to 25% by weight, more preferably 10 to 20% by weight. When the content of aluminum oxide is less than 3% by weight, the ion exchange capacity becomes weak, and when it exceeds 25% by weight, the potential becomes overpotential and the cohesive force becomes weak.

Calcium oxide used in the present invention forms an ettringite reaction with active silica in water. The content is preferably 5 to 30% by weight, more preferably 5 to 25% by weight. If the content of calcium oxide is less than 5% by weight, the ettringite reaction cannot be performed, and if it exceeds 30% by weight, the radical reaction becomes weak.

The iron oxide used in the present invention has an emulsifying action and works together with aluminum for a coprecipitation action, and its content is preferably 1 to 7% by weight, more preferably 1 to 2% by weight. If the iron oxide content is less than 1% by weight, the emulsification is difficult, and if it exceeds 7% by weight, the coprecipitation action becomes excessive, resulting in reddish brown water.

The content of magnesium oxide used in the present invention is preferably 1 to 5% by weight, more preferably 1 to 2% by weight. When the content of magnesium oxide is less than 1% by weight, the sludge content is high, and when the content of magnesium oxide exceeds 5% by weight, the reaction becomes slow.

The specific mixing ratio of each of the above components should be appropriately adjusted within the above range depending on the contents of heavy metals or solvents, alcohols, inorganic substances, organic substances, etc. contained in the wastewater or sludge to be treated. You can

The purification treatment agent of the present invention can be prepared by mixing and stirring the above components with a mixer. Specifically, for example, a powder mixer such as a rocking mixer was charged with a predetermined amount of raw materials for each component together with a pigment ball, and the mixture was stirred and mixed, and it was confirmed from the dispersion state of the pigment ball that each component was homogenized. Then, the dye balls are removed by a sieve or the like to prepare.

In treating wastewater, the purification treatment agent of the present invention is put into wastewater or sludge, and turbulent flow agitation is performed to aggregate the pollutants in the wastewater or sludge. By adding the purification treatment agent of the present invention to polluted wastewater or sludge and stirring the mixture in a turbulent flow, the reaction is completed in 1 to 2 minutes, and the pollutant is precipitated and solidified,
When the stirring is stopped, the coagulated sludge produced immediately begins to settle and separate, and the supernatant water and the coagulated sludge are completely separated, and the interface becomes clear. As a result, floating suspended substances contained in wastewater and sludge are coagulated and settled as coagulated sludge, and heavy metals and other harmful substances are adsorbed and fixed to the coagulated sludge. The separated coagulated sludge has extremely high stability, does not disintegrate or dissolve even when stirred again, and rather tends to increase the sludge density. Further, there is no change with time and the stability is high.
Further, the separated coagulated sludge is mainly composed of oxides and is granulated, so that the sludge has a very excellent dehydration property. On the other hand, the coagulated sludge formed by the conventional organic or inorganic coagulant is mainly composed of hydroxide, and thus lacks the dewatering property.

The amount of the purification treatment agent of the present invention to be added depends on the pollutant concentration of wastewater and the water content of sludge, but is usually 100 to 700.
Within the range of ppm (100 to 700 g per 1 m ³ ), the desired aggregation and separation effects can be achieved.

The purification treatment agent of the present invention as described above can be used in various pollution wastewater treatment methods. For example, physical treatment includes screen method, precipitation method, flotation method, filtration method, and physicochemical treatment includes coagulation sedimentation method, pressure flotation method, activated carbon adsorption method, ion exchange method, reverse osmosis method, and electrodialysis. Various advanced treatments such as chemical treatment, pH adjustment method, neutralization method, oxidation method and reduction method in chemical treatment, aerobic treatment such as activated sludge method, biofilm method and lagoon method in biological treatment and anaerobic treatment Also, it can be used when a plurality of these treatment methods are combined for treatment. For example, coagulation sedimentation method for wastewater treatment with a lot of suspended suspended solids, ion exchange method for suspension wastewater, anaerobic / aerobic activated sludge method for denitrification, ultrafiltration method for removal of colloidal particles, Further, it is applied to the activated carbon adsorption method for removing aromatic compounds. Further, it can be used for treating sludge generated by the above wastewater treatment.

For example, by using the purification treatment agent of the present invention prior to the treatment by the screen method which is a physical wastewater treatment method, the number of times of back washing of the screen can be reduced. Moreover, by treating the wastewater with the purification treatment agent of the present invention prior to the treatment of the wastewater by the activated carbon adsorption method, the life of the activated carbon is extended and the number of times of replacement is reduced. Further, in the case of wastewater treatment by the pH adjusting method, the treatment with the treatment agent of the present invention removes suspended matter, and the amount of the agent used can be reduced by the action of the alumina zwitterion. Also,
In the case of the ion exchange method, the purification treatment agent of the present invention acts as a natural inorganic ion exchange resin due to the ion exchange ability of zeolite and the amphoteric ion exchange ability of alumina. Furthermore, even in the neutralization method, the oxidation method and the reduction method, it is more effective if the treatment with the purification treatment agent of the present invention is used in combination. Further, also in the anaerobic and aerobic activated sludge method for the purpose of denitrification, if the ammonia nitrogen becomes nitrite nitrogen, it can be removed together with the precipitated sludge by the purification treatment agent of the present invention. Further, when the aromatic compound is removed, it can be removed by the purification treatment agent of the present invention if it is emulsified.

Examples of the wastewater to be treated by the treatment agent for polluted wastewater and sludge according to the present invention as described above include:
Coke-making wastewater containing cyanine, which is a by-product of coking carbon to produce coke, plating plant wastewater containing cyanide and chromium compounds used in the electroplating process, and tributyl used as an antifouling agent for fishing nets. Heavy metals such as fishing net factory wastewater containing tin, organic synthesis factory wastewater containing methylmercury used as mercury for catalysts, semiconductor factory wastewater using chlorine compounds such as tetrachlorethylene and trichlorethylene as cleaning agents, wastewater from cleaning plants, etc. Various kinds of wastewater containing harmful substances are listed. Further, the purification treatment agent of the present invention is an organic waste water from a concentrated liquor manufacturing plant, a waste water from an organic tanning leather manufacturing plant containing harmful substances such as chromium used in a tanning agent, and a textile industry. It can also be used for treating organic or inorganic wastewater. Furthermore, synthetic resins such as alkyd resins, acrylic resins and polyester resins, surfactants, ketones such as acetone and methyl ethyl ketone, polyhydric alcohols such as xylol, toluene and propylene glycol, and ester-based products that are discharged from coating plants. It can also be used for treating wastewater containing compounds, amyl compounds and the like.

[0025]

EXAMPLES The details of the present invention will be described based on examples, but the gist of the present invention is not limited thereto.

An example of the method for preparing the purification treatment agent of the present invention is shown below. (Production Example 1) Natural zeolite (made in Indonesia) 84k
g (28% by weight), baked alum [Daimei Chemical Industry Co., Ltd.
Made, potassium aluminum sulfate: AlK (SO ₄ ) ₂ ] 3
9 kg (13% by weight), sodium carbonate (Na ₂ CO ₃ )
45 kg (15% by weight), silicon dioxide (SiO ₂ ) 72
kg (24% by weight), aluminum oxide (Al ₂ O ₃ ) 3
9 kg (13% by weight), calcium oxide (CaO) 15
300 kg of raw material consisting of kg (5% by weight), iron oxide (Fe ₂ O ₃ ) 3 kg (1% by weight), and magnesium oxide (MgO) 3 kg (1% by weight) was put into a rocking mixer, and the diameter was 1 mm. 50 ml of the vinyl chloride resin beads as described above were added as dye balls, and the mixture was mixed for 2 hours to confirm uniform dispersion of the dye balls, and then the dye balls were removed using a sieve to be used as a purification treatment agent.

Table 1 shows the measurement items of wastewater water quality and the water quality measurement method.

[0028]

[Table 1]

(Example 1) 500 ml of waste water discharged from a metal refinery was placed in a beaker, 100 ppm of the purification treatment agent produced in Production Example 1 was added thereto, and the mixture was stirred for 1 minute by a stir bar and then stirred for 3 minutes. I let it stand. After standing for 3 minutes, the pollutant separated by sedimentation and the supernatant became transparent. The supernatant water was filtered through a 1 μm mesh filter cloth (for analysis) to separate precipitated sludge. The water quality of the separated supernatant water and raw water was measured. This test was performed twice, and the results are shown in Table 2.

[0030]

[Table 2]

(Example 2) To 500 ml of waste water discharged from three lines of a plating factory, 200 ppm of the purification treatment agent produced in Production Example 1 was added, respectively, and treated in the same manner as in Example 1 and separated. Water quality was measured for clear water and raw water. The results are shown in Table 3.

[0032]

[Table 3]

(Embodiment 3) The purification treatment agent produced in Production Example 1 is added to 500 ml of waste water discharged from the plating factory.
0 ppm was added, the same treatment as in Example 1 was carried out, and the water quality of the separated supernatant water and raw water was measured. The results are shown in Table 4.

[0034]

[Table 4]

(Example 4) 20 ml of the purification treatment agent produced in Production Example 1 was added to 500 ml of waste water discharged from the plating factory.
0 ppm was added, the same treatment as in Example 1 was carried out, and the water quality of the separated supernatant water and raw water was measured. The results are shown in Table 5.

[0036]

[Table 5]

(Example 5) To 500 ml of waste water discharged from a dry cell manufacturing plant, 300 ppm of the purification treatment agent produced in Production Example 1 was added and treated in the same manner as in Example 1 to separate the supernatant water and raw water. , The water quality was measured. The results are shown in Table 6.

[0038]

[Table 6]

(Embodiment 6) Washing wastewater 500 of a device before painting discharged from a metalworking factory (gas appliance manufacturing factory)
300 ml of the purification treatment agent produced in Production Example 1
Water was added and treated in the same manner as in Example 1, and the water quality of the separated supernatant water and raw water was measured. The results are shown in Table 7.

[0040]

[Table 7]

(Embodiment 7) Washing wastewater 500 of equipment before painting discharged from a metalworking factory (agricultural machinery manufacturing factory)
150 ml of the purification treatment agent produced in Production Example 1 in ml
Water was added and treated in the same manner as in Example 1, and the water quality of the separated supernatant water and raw water was measured. The results are shown in Table 8.

[0042]

[Table 8]

Example 8 To 500 ml of waste water for washing steel furniture before painting discharged from a metalworking factory (steel furniture manufacturing factory), 200 ppm of the purification treatment agent produced in Production Example 1 was added. The same treatment was performed, and the water quality of the separated supernatant water and raw water was measured. The results are shown in Table 9.

[0044]

[Table 9]

(Example 9) 15 ml of the purification treatment agent produced in Production Example 1 was added to 500 ml of cleaning wastewater of a train vehicle member before painting discharged from a metalworking factory (train vehicle manufacturing factory).
0 ppm was added, the same treatment as in Example 1 was carried out, and the water quality of the separated supernatant water and raw water was measured. The results are shown in Table 10.

[0046]

[Table 10]

(Embodiment 10) 500 paint wastewater discharged from the booth of the exterior wall material coating line of the house exterior wall material manufacturing plant
To the ml, 400 ppm of the purification treatment agent produced in Production Example 1
Water was added and treated in the same manner as in Example 1, and the water quality of the separated supernatant water and raw water was measured. The results are shown in Table 11.

[0048]

[Table 11]

Example 11 To 500 ml of waste water discharged from a rubber vulcanization plant, 300 ppm of the purification treatment agent produced in Production Example 1 was added, and the same treatment as in Example 1 was carried out.
The water quality of the separated supernatant water and raw water was measured. The results are shown in Table 12.

[0050]

[Table 12]

As is clear from the results of Tables 2 to 12,
According to the purification treatment agent of the present invention, pollutants in wastewater are aggregated, sedimented and separated, and the contents of pollutants such as BOD, COD, and heavy metals in the supernatant water are reduced,
The pH was adjusted.

[0052]

As described above, according to the purification treatment agent of the present invention, suspended suspended matter (SS) in polluted wastewater or sludge is aggregated and precipitated regardless of the pH of the water, and C
It is possible to reduce the content of OD, BOD, nitrogen, phosphorus, etc., and to adsorb, settle, and separate harmful metals, PCB, etc., and there is no need to adjust the pH when releasing the separated water, and Sludge that has been dehydrated and solidified is difficult to dissolve in water, and there is no risk of secondary pollution due to re-elution of heavy metals and the like.

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Claims (7)

[Claims] 1. A purification treatment agent for polluted wastewater and sludge, which comprises crystalline aluminosilicate, sodium salt, aluminum salt and metal oxide. 2. The crystalline aluminosilicate is a zeolite.
(XAl₂O₃ySiO ₂) Claims characterized by
Item 1. A purification treatment agent for polluted wastewater and sludge according to Item 1. 3. The sodium salt is sodium carbonate (Na ₂ C
O ₃ ), The purification treatment agent for polluted wastewater and sludge according to claim 1 or 2. 4. The aluminum salt is aluminum sulfate [Al
₂(SO_Four)₃], Aluminum chloride (AlCl₃)and
Potassium aluminum sulfate [KAl₂(SO _Four)₂] Noi
Claims characterized in that there is only one or two or more
Item 6. The polluted wastewater and sludge according to any one of items 1 to 3.
Purification treatment agent. 5. A metal oxide comprising silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), calcium oxide (Ca).
O), iron oxide (Fe ₂ O ₃ ) and magnesium oxide
(MgO) is any one kind or two kinds or more, and the purification treatment agent for polluted waste water and sludge according to any one of claims 1 to 4. 6. Zeolite (xAl ₂ O ₃ ySiO ₂ ), potassium aluminum sulfate [KAl ₂ (SO ₄ ) ₂ ], sodium carbonate (Na ₂ CO ₃ ), silicon dioxide (SiO ₂ ),
Aluminum oxide (Al ₂ O ₃ ), calcium oxide (Ca
O), iron oxide (Fe ₂ O ₃ ) and magnesium oxide (M
and a purification treatment agent for polluted wastewater and sludge. 7. The content of zeolite (xAl ₂ O ₃ ySiO ₂ ) is 15 to 45% by weight, the content of potassium aluminum sulfate [KAl ₂ (SO ₄ ) ₂ ] is 5 to 25% by weight,
Sodium carbonate (Na ₂ CO ₃ ) content of 10 to 30
% By weight, content of silicon dioxide (SiO ₂ ) 5 to 40
%, The content of aluminum oxide (Al ₂ O ₃ ) is 3 to 2
5%, the content of calcium oxide (CaO) is 5 to 30
%, Iron oxide (Fe ₂ O ₃ ) content is 1 to 7% by weight, and magnesium oxide (MgO) content is 1 to 5% by weight, polluted wastewater and sludge according to claim 6. Purification treatment agent.