JPH10272304A - Inorganic electrolytic flocculating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove not only suspended solids in high concentrations contained in a water to be treated but also environmental pollutant substances such as BOD, COD, etc., in the number of several hundreds to several thousands without requiring dilution treatment by using an inorganic flocculating agent together with powder ceramics. SOLUTION: This inorganic flocculating agent is produced by mixing 700-1000 wt. ratio of polyaluminum chloride, 100-120 wt. ratio of basic aluminum sulfate, 20-30 wt. ratio of ferric sulfate, and 50-60 wt. ratio of magnesium sulfate and stirring the mixture while indirectly heating the mixture at 80-100 deg.C heating temperature for 15-20 minutes. Alternatively, this inorganic flocculating gent is produced by mixing 700-1000 wt. ratio of polyferric sulfate, 200-300 wt. ratio of ferric sulfate, and 50-60 wt. ratio of magnesium sulfate and stirring the mixture while indirectly heating the mixture at 80-100 deg.C heating temperature for 15-20 minutes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to general factory wastewater such as meat processing factory wastewater, catering center wastewater, and the like.
High-concentration COD and BO such as cutting oil waste liquid and chemical mixed waste water
The present invention relates to an inorganic electrolytic flocculant capable of adsorbing and removing special wastewater such as wastewater containing pollutants contained in water D by coagulation and precipitation in combination with powdered ceramics.

[0002]

2. Description of the Related Art Conventionally, various kinds of wastewater are mainly used as a flocculant by a coagulation sedimentation method, such as iron salts such as polyaluminum chloride, aluminum sulfate, ferric chloride and ferric polysulfate. And various polymer flocculants.

The conventional flocculant as described above is a process for removing suspended substances (SS) mixed in the water to be treated by flocculation, and has a limited effect, and has a limited efficiency. It is the fact that there is none.

[0004] In the case of an organic polymer flocculant, charge neutralization and trapping and agglomeration by a super viscous molecular chain form a floc with a hydrophilic group and settle. Therefore, dehydration work is extremely difficult.

[0005] On the other hand, polyaluminum chloride, aluminum sulfate and the like are hydrophobic flocs, but are fine and poor in sedimentation, and still have a problem in the dewatering operation.

[0006] The coagulant leaves a large amount of organic matter in the treated water, which is a major cause of water pollution.
For this reason, even in the case of ordinary wastewater that is generally handled, the treated water is diluted several times to several tens times and discharged.

[0007]

SUMMARY OF THE INVENTION The present invention aims to alleviate the above-mentioned drawbacks of the prior art at once. It is an object of the present invention to obtain an inorganic electrolytic flocculant capable of treating hundreds to thousands of pollutants such as BOD and COD without diluting, as well as turbid substances.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned viewpoints, and has a weight ratio of polyaluminum chloride of 700 to 1000, a weight ratio of basic aluminum sulfate of 100 to 120, and a weight ratio of ferric sulfate. Ratio 20 to 30 and magnesium sulfate weight ratio 50 to 60 were mixed at a heating temperature of 80.
An inorganic electrolytic flocculant obtained by stirring for 15 to 20 minutes while indirectly heating at from 100 ° C to 100 ° C, or a ferric polysulfate weight ratio of 700 to 1000, a ferric sulfate weight ratio of 200 to 300,
It is an object of the present invention to provide an inorganic electrolytic flocculant obtained by mixing magnesium sulfate in a weight ratio of 50 to 60 and stirring for 15 to 20 minutes while indirectly heating at a heating temperature of 80 to 100 ° C.

[0009]

Next, an embodiment of the present invention will be described together with its operation.
The inorganic electrolytic flocculant according to the present invention is used by being added simultaneously with the powder ceramics.

The inorganic electrolytic flocculant is added to the water to be treated, and at the same time, a hydration reaction occurs, and each polycondensation ion (various polymers) is generated. Regardless of the negative colloidal charge, it is a major feature to have strong attraction and neutralization reaction.

On the other hand, the purpose of the simultaneous addition of the powder ceramics is to adsorb and occlude the positive and negative hydrophobic colloidal substances, which are prevented from aggregating by the repulsion of the high zeta potential colloidal particles, in the enormous pores.

As described above, the inorganic electrolytic flocculant is obtained by fusing several kinds of inorganic iron salts, and generates polyvalent metal ions during the hydration reaction. The polycondensation ions destroy the shell of the colloidal electric double layer (zeta potential layer) and neutralize the polycondensation particles, and polyvalent metal ions are particularly effective for coagulating highly charged hydrophobic colloidal fine particles.

That is, while several types of ions play their roles with their respective characteristics, intense collisional coupling with the isomeric charge occurs, and at the same time, neutralizes the poles of the bound water molecules and turns them into free water to form a fan between colloidal microparticles. According to Delwar's law, the attractive force is increased between the total particles, coagulation starts, agglomerates, and eventually grows into flocs and sinks.

Since the sedimented floc has lost its charge due to electrical neutralization, the hydrophilic groups of the water molecules in the floc are destroyed, so that free water is extruded by attractive compression between the mutual particles. That is, the floc has excellent dewatering properties.

[0015] The treated water that has undergone the above-mentioned steps is treated with an astonishing precision to remove all pollutants in the water.

The inorganic electrolytic flocculant according to the present invention is added together with the powder ceramic into the water to be treated during the flocculation reaction.

During the coagulation and stirring step, the pH is adjusted to 3-4.
It is appropriate to adjust the acidity to a certain degree. That is, when the coagulant and the powdered ceramic are added simultaneously during stirring, the shell of the colloidal electric double layer in water is broken, and the attractive force between the particles is increased according to Van der Waals' law. By reducing the ionized portion of the pollutant, the conditions for adsorption by ceramics are improved, and the processing accuracy is remarkably improved.

[0018]

An embodiment of the present invention will be described below. First Example Polyaluminum chloride weight ratio 700-1000, basic aluminum sulfate weight ratio 100-120, ferric sulfate weight ratio 20-30, magnesium sulfate weight ratio 50-60 were mixed, and the heating temperature was 80 ° C-100 ° C. An inorganic electrolytic flocculant obtained by stirring for 15 to 20 minutes while indirectly heating at ℃ was obtained.

Second Example Ferric polysulfate weight ratio 700-1000, ferric sulfate weight ratio 200-300, magnesium sulfate weight ratio 50-6.
0, and the mixture was stirred for 15 to 20 minutes while indirectly heating at a heating temperature of 80 to 100 ° C. to obtain an inorganic electrolytic flocculant.

The coagulant according to the first embodiment of the present invention is mainly used for general factory wastewater, and has the following characteristics. 1. Those whose main component is a high molecular weight aluminum salt. 2. The amount of alkali consumed during hydrolysis is as small as about half that of iron salts, and the rate of decrease in PH is small, so that the amount of PH regulator is saved. 3. Even if the addition amount is twice or more the appropriate amount, there is no problem such as coloring of the treated water, so that the handling is convenient. 4. Although the cohesion of the suspension water is large and the clarity of the treated water is good, the cohesion of the suspended particles with respect to the ultra-fine colloid particles has a problem and is not suitable for the treatment of high-concentration BOD and COD wastewater.

The coagulant according to the second embodiment of the present invention is mainly used for special wastewater treatment and has the following characteristics. 1. Those whose main component is a high molecular weight iron salt. 2. Since the amount of alkali consumed during hydrolysis is about twice that of the agent A, the rate of decrease in PH is large and the amount of the regulator used is large. 3. If the added amount is more than an appropriate amount, there is a problem such as coloring of the treated water, and care must be taken in handling. 4. The ultrafine suspended particles have a strong cohesive force on the colloid particles. However, it is suitable for treating wastewater containing BOD and COD with high concentration. 5. This agent has a disadvantage that a residual component of the iron salt remains in the treated water, which causes a new COD, but the residual component can be easily removed by passing activated carbon through water.

Hereinafter, a specific method of using the inorganic electrolytic flocculant will be described. 1. In the coagulation and stirring plant, the powder ceramics and the inorganic electrolytic coagulant according to the present invention are simultaneously added to the water to be treated. Agitation time 15 minutes to 20 minutes (The treatment accuracy is improved by increasing the agitation time for high-concentration COD wastewater.) Adjust to PH 3-4. A polymer flocculant is added (a cation is used as the polymer flocculant. The cationic polymer not only neutralizes the charge but also reacts with the electrolyte to form an insoluble salt.) Stirring time 5 minutes to 6 minutes Adjust the pH to 5.5-6. The precipitate is separated and the supernatant water is discharged. 4. General factory wastewater can be recycled simply by passing supernatant water to an activated carbon plant. (The value is higher than the analytical value of industrial water.)

[0023]

As is apparent from the above description, according to the present invention, the inorganic electrolytic flocculant is used together with the powdered ceramics to remove the high-concentration suspended substances contained in the water to be treated. The removal of pollutants such as high concentrations of BOD and COD can be performed without dilution.

Claims (2)

[Claims] 1. A polyaluminum chloride weight ratio of 700 to 1
000, basic aluminum sulfate weight ratio 100-12
0, an inorganic electrolytic flocculant obtained by mixing a ferric sulfate weight ratio of 20 to 30 and a magnesium sulfate weight ratio of 50 to 60 and stirring for 15 to 20 minutes while indirectly heating at a heating temperature of 80 to 100 ° C. 2. A ferric polysulfate weight ratio of 700 to 100.
0, ferric sulfate weight ratio of 200 to 300, magnesium sulfate weight ratio of 50 to 60 are mixed, and the heating temperature is 80 ° C to 100 ° C.
Inorganic electrolytic flocculant obtained by stirring for 15 to 20 minutes while indirectly heating at ℃.