JPH0824640A - Treatment of sewage and additive therefor - Google Patents

Abstract

PURPOSE:To reduce the load on sludge in sewage treatment, to enhance the filterability of sludge and to realize the reduction of the adhesion of scummed oil while enabling the oil along with sludge to be incinerated by adding an oil absorbable polymer obtained by polymerizing a monomer component containing a specific monomer in a specific ratio or more. CONSTITUTION:The additive for sewage treatment is constituted so as to contain an oil absorbable polymer obtained by polymerizing a monomer component based on a monomer with a solubility parameter (SP value) of 9 or less and containing 50wt.% or more of a monomer having one polymerizable group in its molecule. This oil absorbable polymer is granulated along with a water- insoluble powder to be formed into a granular form and used as the additive for sewage treatment. As the water-insoluble powder to be used herein, there is no limit if an insoluble or hardly soluble powder of which the water solubility at 25 deg.C or lower is 1 pts. or less per 100 pts. of the water-insoluble powder is used, but a powder generating no harmful gas at the time of incineration and low in the content of ash is more pref.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment additive and a sewage treatment method. More specifically, it absorbs the oil contained in the sewage flowing into the sewage treatment plant, reduces the BOD load on the sludge, improves the drainage of the sludge after the sludge treatment, and prevents the oil scum from adhering to the equipment. TECHNICAL FIELD The present invention relates to an additive for sewage treatment that can prevent and incinerate simultaneously with sludge, and a sewage treatment method using the additive.

[0002]

2. Description of the Related Art Conventionally, most sewage treatment is performed by sludge treatment. However, a large amount of oil was contained in the sewage, which was too high to dissolve, and it always applied a great load to the sludge, and there was a problem that the oil that could not be decomposed was contained in the treated water. . In particular, when a large amount of rain fell, the oil accumulated in the pipes in various places suddenly flowed into the sewage treatment facility, and a great load was applied to the sludge. In addition, this sewage containing a large amount of oil adheres to the filter cloth and sludge during dewatering of the sludge to reduce the drainage and inhibit the sludge's filterability, increasing the amount of sludge, and scumming to adhere to tanks and equipment. It also caused the blockage of the piping and the like.

As a method for separating the oil component in the sewage, there are a method using an oil treating agent, a method using activated carbon, and a mechanical method. As a method of using an oil treatment agent, there is a method of absorbing and solidifying with an oil adsorbent or an oil gelling agent, which requires a small capital investment, but the absorption capacity is not sufficient and the operation is complicated. The method using activated carbon is an effective method for removing a very small amount of oil, but rather dissolved oil.
Activated carbon can adsorb oil components only up to about twice its own weight, and also adsorbs components other than oil components, which further promotes deactivation. Also, as a mechanical method,
Examples include gravity separation devices such as API oil separators, floatation separation methods that use bubbles, pressure floating methods that generate fine bubbles when pressure is applied to drainage, and filtration methods, but the equipment costs are enormous. In addition, there is a problem that the oil separation performance is not sufficient. In addition, these methods also have a problem that industrial waste treatment is required after the treatment because the oil is basically separated. Therefore, there is a demand for an alternative product that has a low capital investment, is easy to use, has good oil separation ability, and can be incinerated at the same time as sludge.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems associated with sewage treatment.

That is, the object of the present invention is to reduce the load on sludge in the treatment of sewage, improve the drainage of sludge, reduce the adhesion of scumified oil to equipment, and to incinerate it simultaneously with sludge. An object of the present invention is to provide an additive and a sewage treatment method.

[0006]

Means for Solving the Problems The inventors of the present invention add a sewage treatment additive consisting of an oil-absorbing polymer (I) and its derivative to sewage, mix it in sludge, and treat water after sludge treatment. It was found that the above-mentioned object can be easily achieved by the method of adding to the present invention, and the present invention has been completed.

That is, the present invention contains 50% by weight or more of a monomer (A) having one polymerizable group in a molecule whose main component is a monomer having a solubility parameter (SP value) of 9 or less. Additive for sewage treatment comprising an oil-absorbing polymer (I) obtained by polymerizing a monomer component for forming a sewage treatment additive, wherein the oil-absorbing polymer (I) is a granule (II); The substance (II) is a granular substance containing 30 to 99 parts by weight of the oil-absorbent polymer (I) and 1 to 70 parts by weight of a water-insoluble powder, and a sewage treatment containing the granular substance (II). Additive; sewage treatment additive obtained by filling the oil-absorbent polymer (I) and / or the granules (II) in an oil-permeable bag; the oil-absorbent polymer (I) and / or the granules The additive for treating sewage, which comprises the substance (II) supported on a porous substrate, and sewage. A sewage treatment method, which comprises contacting the sewage treatment additive according to any one of the claims and then performing sludge treatment; sewage was contacted with the sewage treatment additive according to any one of claims 1 to 6. After that, the sewage treatment additive is introduced into the sludge tank together with the treated sewage and the treated sewage treatment additive, and the sludge treatment is performed; the sewage treatment additive according to any one of claims 1 to 6. Is mixed with sludge and sewage is treated with sludge; after the sewage is treated with sludge, the sewage treatment additive according to any one of claims 1 to 6 is contacted with the treated water. The present invention relates to a sewage treatment method which is characterized by

[0008]

The solubility parameter (SP value) is generally used as a measure of the polarity of a compound, and in the present invention, a value derived by substituting the Hoy cohesive energy constant into the Small calculation formula is applied, The unit is (cal /
It is represented by cm ³ ) ^1/2 .

Oil absorbing polymer (I) used in the present invention
Is an oil-absorptive polymer obtained by polymerizing a monomer (A) having one polymerizable group in a molecule whose main component is a monomer having a solubility parameter (SP value) of 9 or less. There is no particular limitation. When a monomer having a solubility parameter (SP value) of more than 9 is used as the main component of the monomer (A), a polymer having high oil absorption cannot be obtained and the required addition amount increases or the oil absorption weight increases. It is not preferable because the exchange life of the combined product (I) becomes short.

Examples of the oil absorbing polymer (I) used in the present invention include polyvinyl chloride, polyvinylidene chloride,
Polyvinyl acetate, polystyrene, (meth) acrylic resin, polyvinyl alcohol, polyolefin, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polycarbonate, polyamide, acetyl cellulose, polynorbornene, fluororesin, phenolic resin, urea resin, melanin resin, polyester resin , Allyl resins, silicone resins, epoxy resins, AS resins, ABS resins, synthetic rubbers, natural rubbers and other homopolymers, copolymers, condensates or mixtures of these resins.

The monomer constituting the main component of the monomer (A) used in the present invention is a monomer having a solubility parameter (SP value) of 9 or less and having one polymerizable unsaturated group in the molecule. It is preferable that the form is methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth).
Acrylate, dodecyl (meth) acrylate, isobornyl (meth) acrylate, stearyl (meth) acrylate, phenyl (meth) acrylate, octylphenyl (meth) acrylate, nonylphenyl (meth)
Unsaturated carboxylic acid esters such as acrylate, dinonylphenyl (meth) acrylate, cyclohexyl (meth) acrylate, menthyl (meth) acrylate, dibutyl maleate, didodecyl maleate, dodecyl crotonate, didodecyl itaconate; (di) Butyl (meth) acrylamide, (di) dodecyl (meth) acrylamide, (di) stearyl (meth) acrylamide, (di) butylphenyl (meth) acrylamide,
(Meth) acrylamide having a hydrocarbon group such as (di) octylphenyl (meth) acrylamide; ethylene, propylene, isobutene, 1-butene, 1-hexene, 1-octene, isooctene, 1-nonene, 1-decene, 1 -Α-olefins such as dodecene; alicyclic vinyl compounds such as vinylcyclohexane; allyl ethers having a hydrocarbon group such as dodecyl allyl ether; hydrocarbons such as vinyl caproate, vinyl laurate, vinyl palmitate and vinyl stearate. Vinyl ester having a hydrocarbon group such as butyl vinyl ether and dodecyl vinyl ether; aromatic vinyl compound such as styrene, t-butyl styrene and octyl styrene; dicyclopentadiene and tetracyclododecene Tyltetracyclododecene, ethylidenetetracyclododecene, hexacycloheptadecene, methylhexacycloheptadecene, tricyclopentadiene, norbornene, methylnorbornene, ethylidenenorbornene, vinylnorbornene, 5-methyl-2-norbornene, 5,6- Dimethyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl-2
-Norbornene, 5-hexyl-2-norbornene, 5
Examples thereof include norbornene compounds such as octyl-2-norbornene and 5-dodecyl-2-norbornene, and one or more kinds of these monomers can be used.

Among these, as the monomer (A) which gives the oil absorption performance more excellent in the above-mentioned performance, there is at least one aliphatic hydrocarbon group having 3 to 30 carbon atoms and alkyl (meta) ) Acrylate, alkylaryl (meth) acrylate, alkyl (meth) acrylamide,
Those containing at least one unsaturated compound selected from the group consisting of alkylaryl (meth) acrylamides, alkylstyrenes and α-olefins as the main component are preferred because of their high oil absorption performance in the sewage.

Such solubility parameter (SP value)
Is 9 or less, the amount used in the monomer (A) is
The proportion is 50% by weight or more, more preferably 70% by weight or more, based on the total amount of the monomer (A). When the amount of the monomer having a solubility parameter (SP value) of 9 or less in the monomer (A) is less than 50% by weight, a polymer having high oil absorption cannot be obtained, and the required amount is increased. However, the exchange life of the oil-absorbent polymer (I) is shortened, which is not preferable.

Therefore, in the present invention, 50 monomers having a solubility parameter (SP value) of 9 or less are contained in the monomer (A).
It is necessary to contain at least 50% by weight, but the solubility parameter (SP value) is 50% by weight or less in the monomer (A).
May contain more than 9 monomers. Examples of such a monomer include (meth) acrylic acid, acrylonitrile, maleic anhydride, fumaric acid, hydroxyethyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, and methoxypolyethylene glycol (meth) acrylate. be able to.

Oil absorbing polymer (I) used in the present invention
Is more preferably a crosslinked polymer. This is to prevent the oil-absorbing polymer (I) from dissolving in the oil and because the uncrosslinked product has a low gel strength and is difficult to handle.

Examples of the crosslinkable monomer (B) used in the present invention include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate,
Polyethylene glycol di (meth) acrylate, polyethylene glycol-polypropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, neopentyl glycol di (meth)
Acrylate, 1,6-hexanediol di (meth) acrylate, N, N'-methylenebis (meth) acrylamide, N, N'-propylenebis (meth) acrylamide, glycerin tri (meth) acrylate, trimethylolpropane tri (meth) ) Acrylate, tetramethylolmethane tetra (meth) acrylate, polyfunctional (meth) obtained by esterification of alkylene oxide adduct of polyhydric alcohol (eg glycerin, trimethylolpropane or tetramethylolmethane) with (meth) acrylic acid Examples thereof include acrylate and divinylbenzene, and one or more of these crosslinkable monomers can be used.

The ratio of the monomer (A) and the crosslinkable monomer (B) in the more preferable monomer component used for producing the oil-absorbent polymer (I) is as follows. And the total amount of the crosslinkable monomer (B) is 96 to 9 in the monomer (A).
9.999 wt% range, the crosslinkable monomer (B) is 0.0
It is in the range of 01 to 4% by weight.

If the amount of the monomer (A) is less than 96% by weight or the amount of the crosslinkable monomer (B) exceeds 4% by weight, the crosslink density of the obtained crosslinked polymer becomes too high and the oil absorbency is increased. It is not preferable because a high polymer cannot be obtained, the required addition amount increases, and the exchange life of the oil absorbing polymer (I) becomes short.
When the amount of the monomer (A) exceeds 99.999% by weight,
The oil absorption of the resulting oil-absorbent polymer (I) is increased,
It is not preferable because the oil-absorbent polymer (I) is slightly dissolved in oil or the gel strength is lowered to deteriorate the handleability.

In order to produce the oil absorbing polymer (I), the above-mentioned monomer component may be polymerized using a polymerization initiator. Also, polycondensation can be carried out by light such as ultraviolet rays, radiation, heat, or the like. The polymerization can be carried out by a known method such as suspension polymerization, bulk polymerization or emulsion polymerization.

In the suspension polymerization, for example, an emulsifier having a high HLB value or a protective colloid agent such as polyvinyl alcohol, hydroxyethyl cellulose or gelatin is used to suspend the monomer component in water to prepare an oil-soluble polymerization initiator. The polymerization may be carried out in the presence of Examples of the polymerization initiator include organic peroxides such as benzoyl peroxide, lauroyl peroxide, cumene hydroperoxide, 2,2′-azobisisobutyronitrile, and 2,2′-azobisdimethylvaleronitrile. The azo compound can be used, and the polymerization temperature is preferably in the range of 0 to 150 ° C. The target oil-absorbent polymer (I) is obtained by filtering and drying the resulting aqueous suspension of fine particulate resin of about 10 to 1000 μm.

The bulk polymerization is carried out, for example, by pouring a monomer component into a mold in the presence of the above-mentioned polymerization initiator and conducting the polymerization under the condition of 0 to 150 ° C. to obtain the objective oil-absorbing polymer (I). Is obtained.

In emulsion polymerization, for example, a monomer component is suspended in water using an anionic or nonionic emulsifier or a composite emulsifier thereof, and a persulfate such as ammonium persulfate or potassium persulfate or a water-soluble azo compound is suspended. It is possible to use it as a polymerization initiator and polymerize it together with a reducing agent, a pH adjusting agent, an antioxidant, an antistatic agent, etc., if necessary, and carry out the polymerization under the condition of 0 to 150 ° C. Thus, the target oil-absorbing polymer (I) is obtained.

The oil-absorbent polymer (I) obtained in the present invention is
It can be used as an additive for sewage treatment by granulating with a water-insoluble powder to form a granular material (II). Preferred granules (I
I) is a granular material composed of 30 to 99 parts by weight of an oil absorbing polymer and 1 to 70 parts by weight of a water-insoluble powder. The water-insoluble powder used in the present invention is particularly a non-dissolved or hardly soluble powder having a solubility in water at 25 ° C. of 1 part or less with respect to 100 parts of the water-insoluble powder. There is no limitation, but the one with less ash that does not generate toxic gas upon incineration is preferable. For example, inorganic powder such as silica, talc, diatomaceous earth, metal powder such as iron powder, inorganic powder salt such as calcium carbonate, organic metal salt such as metal soap, polymer powder such as polystyrene, polyethylene, vinyl chloride, wax, etc. Organic powder,
Examples include natural powders such as cotton powder and pulp powder, and one or more of these may be used. Among them, preferred water-insoluble powders used for granulation with the oil-absorbent polymer (I) include organic acid metal salts having a solubility of 1 g or less in 100 g of water at 20 ° C. and hydrophobic inorganics having a methanol value of 25% or more. Compounds.

Examples of the granular material (II) of the present invention include, for example, an oil absorbing agent (I) and an organic acid metal salt having a solubility of 1 g or less in 100 g of water at 20 ° C. -147313) or an oil-absorbing polymer (I) and an oil-absorbing agent (Japanese Patent Application No. 5-231390) comprising a hydrophobic inorganic compound having a methanol value of 25% or more such as hydrophobic silica.

Organic acid metal salts include, for example, linear saturated fatty acids such as butyric acid, caproic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, and arachidic acid; oleic acid, linoleic acid. , Linear unsaturated fatty acids such as linolenic acid; branched fatty acids such as isostearic acid; fatty acids containing hydroxyl groups such as ricinoleic acid and 12-hydroxystearic acid; benzoic acid; naphthenic acid; abietic acid; rosin such as dextropimaric acid Lithium salts, copper salts, beryllium salts, magnesium salts, calcium salts, strontium salts, barium salts, zinc salts, cadmium salts, aluminum salts, cerium salts, titanium salts, zirconium salts, lead salts, chromium of organic carboxylic acids such as acids. Salt, manganese salt, cobalt salt, nickel salt, etc. It can gel.

The methanol value (hereinafter sometimes referred to as M value) is generally used as a measure of the degree of hydrophobicity of the water-insoluble powder, and the methanol when the water-insoluble powder begins to wet the aqueous methanol solution. Is expressed in volume%. In the present invention, a value measured by putting a powder of a water-insoluble powder in an aqueous methanol solution prepared to a predetermined concentration and shaking the powder twice by hand shaking is used. To do. For example, a compound having an M value of 30% is a compound that is wet with an aqueous methanol solution having a volume% of methanol of 30% or more and not wet with an aqueous methanol solution having a volume% of methanol of less than 30%.

Among the hydrophobic inorganic compounds, those having a hydrophobicity of 25% or more in methanol value include, for example, zinc oxide, alumina (aluminum oxide), aluminum silicate, silica (silicon oxide), calcium oxide, calcium carbonate. Hydrophobized modifications such as titanium oxide, barium titanate, iron oxide, barium sulfate, barium carbonate, barium oxide, manganese dioxide, manganese carbonate, magnesium carbonate, and magnesium oxide can be mentioned. Among these hydrophobic inorganic compounds, hydrophobic silica and hydrophobic alumina, which are easily available as powders having various particle sizes, are preferable.

The method for obtaining the hydrophobic inorganic compound by hydrophobizing the inorganic compound is not particularly limited, and for example, the surface of the powder of the inorganic compound may be chemically or physically inactivated. Alkylalkoxysilane,
Examples thereof include a method using a silane coupling agent such as an alkylhalogenated silane, a method using a polysiloxane such as dimethylsiloxane, a method using a synthetic wax or a natural wax, and a method of treating a metal surface with calcium or the like.

The water-insoluble powder has an average particle size of 0.01 to 3
The powder is preferably in the range of 00 μm. If the average particle size is less than 0.01 μm, the powder particles agglomerate to reduce the oil absorption rate, which is not preferable. Further, if the average particle size exceeds 300 μm, the synergistic effect with the oil absorbing polymer (I) is difficult to be exhibited, and the oil absorbing rate cannot be improved, which is not preferable.

In order to produce the granular material (II) containing the oil-absorbing polymer (I) and the water-insoluble powder, these components may be mixed and granulated. There is no particular limitation. As a mixing method, either wet mixing or dry mixing can be adopted. The wet mixing can be performed by, for example, a method of mixing and dispersing the oil-absorbent polymer (I) and the water-insoluble powder in an aqueous medium in the presence of a surfactant, if necessary, and then filtering and drying. The dry mixing can be carried out, for example, by mixing the oil-absorbent polymer (I) and the water-insoluble powder with a colloid mill, a kneader or a mixer. In particular, wet mixing is preferable because the water dispersion of the oil-absorbing polymer (I) obtained by the suspension polymerization can be mixed with the water-insoluble powder as it is. Further, a method of mixing the oil-absorbent polymer (I) obtained by bulk polymerization and the water-insoluble powder while adjusting the particle size by a pulverizing operation or the like can also be adopted. It is also possible to granulate by using a binder and the like together.

In particular, the oil-absorbent polymer (I) granules and the water-insoluble powder are mixed and dispersed in an aqueous medium, both are aggregated and granulated, and then the granulated product is separated from the aqueous medium. The resulting granulate is particularly preferred. Further, the average particle size of the granular material (II) is preferably in the range of 0.1 to 5 mm.

The mixing ratio of the oil-absorbing polymer (I) and the water-insoluble powder in the thus-prepared granular material (II) is 30 to 99 parts by weight of the oil-absorbing polymer (I) and water-insoluble. The ratio is such that the powder becomes 1 to 70 parts by weight. If the amount of the water-insoluble powder is less than 1 part by weight, the particles of the oil-absorbing polymer (I) aggregate with each other, and the oil-absorbing speed of the oil-absorbing agent decreases, so that the oil-absorbing speed improving effect cannot be expected. In addition, water-insoluble powder 7
If it is used in a large amount in excess of 0 parts by weight, the oil absorption amount and oil retaining performance of the sewage treatment additive are deteriorated, which is not preferable.

The oil-absorbent polymer (I) and / or granules (II) of the present invention can be filled in an oil-permeable bag or supported on a porous substrate and used as an additive for sewage treatment. .

The method for producing the sewage treatment additive obtained by filling the oil-absorbent polymer (I) and / or the particulate matter (II) of the present invention in an oil-permeable bag is not particularly limited, but it may be in the form of slurry or The powdery oil-absorbent polymer (I) and / or the granular material (II) is filled into an oil-permeable bag-like product while being formed into a bag by a vertical pillow or horizontal pillow type bag making machine, and the opening is sealed. Then, it can be obtained by drying if necessary.

As the porous material used for the oil permeable bag, the oil absorbing polymer (I) which does not dissolve or swell in water itself and is filled in the container made of the material, or There is no particular limitation as long as it has a large number of pores of a size that does not allow the granular material (II) to leak to the outside and allows oil to easily pass therethrough. As such a porous material, for example, cloth or paper made of natural fibers such as synthetic fibers or pulp, and net such as stainless mesh can be used. Among them, as a means for providing an additive for sewage treatment having a particularly excellent oil absorption performance, polyolefin itself such as polypropylene or polyethylene having a high lipophilicity that itself has hydrophobicity and preferably adsorbs oil, polyester, nylon or A nonwoven fabric or woven fabric made of at least one synthetic resin selected from the group consisting of polyurethane is preferable. The shape of the container made of this porous material is not particularly limited, and examples thereof include a bag-shaped material made of cloth or paper, a basket-shaped material made of net, and the like.

As a method for producing an additive for sewage treatment, which comprises supporting the oil-absorbent polymer (I) and / or the particulate matter (II) on a porous substrate, the oil-absorbent polymer (I) or the particulate matter is used. There is no particular limitation as long as (II) can be supported on the porous base material to such an extent that it is not detached from the porous base material. For example, a fiber material and an oil-absorbing polymer (I ) Or granules (II) are mixed with each other in a wet or dry manner, and then molding may be performed. A method such as dipping or coating with a preformed porous substrate using an adhesive or a binder as required. The method of supporting the oil-absorbent polymer (I) and / or the particulate matter (II) may be used. Further, a sheet having a porous base material carrying the oil-absorbing polymer (I) and / or the particulate matter (II) is filled in a pack to obtain the oil-absorbing polymer (I) and / or the particulate matter (II).
Can be prevented from being released into the environment and the strength can be improved.

As the porous substrate, the oil absorbing polymer (I) is used.
There is no particular limitation as long as it can form a molded article such as a woven cloth or sponge or paper having a large surface area capable of effectively supporting the particulate matter (II) and a void for absorbing and retaining oil, and examples thereof include polypropylene and polyethylene. Polyolefin, polyester, nylon, polyurethane, cellulose, viscose, rayon, cupra, acetate, etc.
Pulp, cotton, glass, metal, etc. can be mentioned.

Further, the sewage treatment additive and the oil-absorbent polymer (I) and / or the granules obtained by filling the oil-absorbent polymer (I) and / or the granules (II) of the present invention in an oil-permeable bag. The sewage treatment additive in which the substance (II) is supported on a porous substrate can be used by molding into any shape such as a cylindrical shape, a rectangular parallelepiped shape, a spherical shape, or a sausage shape.

Preferred examples of these are, for example, an oil-absorbing material (JP-A-04-015286) in which a hydrophobic porous container is filled with the oil-absorbing polymer (I), the oil-absorbing polymer (I) and 100 g of water at 20 ° C. Oil-absorbing material prepared by filling a container made of a porous material with a granular material made of an organic acid metal salt having a solubility of 1 g or less (Japanese Patent Application No. 04-
230835), an oil-absorbing material obtained by filling an oil-permeable container with an oil-absorbing agent composed of an oil-absorbing polymer (I) and a hydrophobic inorganic compound having a methanol value of 25% or more such as hydrophobic silica (Japanese Patent Application No.
246491), an oil-absorbing polymer (I) supported on a hydrophobic porous substrate (Japanese Patent Laid-Open No. 4-41583), and a granular material comprising the oil-absorbing polymer (I) and a water-insoluble compound is porous. Porous oil absorbing material supported on a base material (Japanese Patent Application No. 05-5
6920), a porous oil-absorbing material comprising an oil-absorbing polymer (I) and a hydrophobic inorganic compound such as hydrophobic silica having a methanol value of 25% or more on a porous base material (Japanese Patent Application No.
-308463) and the like.

In addition, sewage treatment additives comprising these oil-absorbing polymers (I) and / or granules (II) and sewage treatments in which they are filled in an oil-permeable bag or supported on a porous substrate. The additives for use can also be used in combination.

The sewage treatment additive of the present invention can be used in various forms. For example, the sewage treatment agent of the present invention may be directly sprayed into sewage, or may be used after being filled in an open container such as a cylindrical tube.

Further, the sewage treatment additive of the present invention includes, for example, rice husk, straw, potato residue, pulp, cotton, porous lime, activated carbon, porous silica, porous pearlite, polypropylene fiber, expanded polyurethane and the like. It can be used in combination with a conventionally known oil absorbing agent or filler.

The sewage and the sewage treatment facility to which the present invention is applied are not particularly limited, and include domestic sewage, industrial wastewater, sewage generated from rivers and its treatment facility.

The oil contained in the sewage is not particularly limited as long as it is used in industry or daily life and is discarded into industrial wastewater or domestic wastewater, and mineral oil, animal and vegetable oil, fuel oil, mechanical oil, etc. Can be mentioned. For example, chlorine-based and fluorine-based compounds such as methylene chloride, 1,1,1-trichloroethane, trichloroethylene, tetrechloroethylene, trichlorofluoroethane, kerosene, gasoline,
Petroleum-based solvents such as light oil, heavy oil A, heavy oil B, heavy oil C, terpene oils such as limonene, machine oils such as engine oil and spindle oil, aromatic oils such as toluene and xylene, hexane, octane, nonane , Decane and other aliphatic oils, butanol, propanol, pentanol, hexanol, octanol, decanol, dodecanol, mistyl alcohol and other alcohols, soybean oil, safflower oil, rapeseed oil, castor oil, sesame oil, salad oil, lard, etc. Examples thereof include oils, ketones such as acetone and methyl ethyl ketone.

The sewage treatment method to which the present invention is applied is not particularly limited, and known methods can be used. For example, anaerobic digestion is the main method for treating and disposing of sewage sludge,
Aerobic decomposition, concentration, chemical treatment, heat treatment, solid-liquid separation, wet oxidation, sludge washing, air drying, dehydration, artificial heat drying, incineration, etc., such as the combination of (1) ~ (6) It is done in combination.

(1) Raw sludge → Concentration → Digestion → Washing → Chemical treatment → Dehydration → Final disposal (2) Raw sludge → Concentration → Digestion → Washing → Chemical treatment → Dehydration → Incineration → Final disposal (3) Raw sludge → Concentration → Chemical addition → Dehydration → Incineration → Final disposal (4) Raw sludge → Concentration → Heat treatment → Solid-liquid separation → Dewatering → Final disposal (5) Raw sludge → Concentration → Heat treatment → Solid-liquid separation → Dewatering → Incineration → Final disposal ( 6) Raw sludge → Concentration → Wet oxidation → Solid-liquid separation → Dehydration → Final disposal There are no particular restrictions on the type of sludge to be added to the sewage treatment additive and sewage treatment method of the present invention, for example, anaerobic digestion sludge, Anaerobic digestion sludge of human waste, human waste septic tank sludge, human waste digestive desorption liquid, sewage, excess sludge in sludge treatment of various industrial wastewater, sewage first settling tank sludge, coagulated sludge generated by tertiary treatment of human waste, sewage, various Examples include coagulated sludge of industrial wastewater and a mixture thereof.

There are no particular restrictions on the equipment such as the stirring tank, the dryer, the aeration tank, the dehydrator, and the incinerator used in the sewage treatment method of the present invention, and known equipment can be used. For example, belt press dehydrator, centrifugal dehydrator, vacuum dehydrator, screw press, filter press and other dehydrators, vertical multi-stage incinerator, rotary drying incinerator, fluidized bed incinerator, stair moving bed incinerator, air flow drying Examples include incinerators, incinerators such as a wet oxidation device, and the like.

The sludge flocculating and dehydrating agent used in the sewage treatment method of the present invention is not particularly limited, and an inorganic flocculant,
An organic flocculant can be used. For example, as the inorganic flocculant, a polyvalent metal salt is often used and ferrous sulfate,
Ferric sulfate, polyferric sulfate, ferric chloride, aluminum sulfate, iron-containing aluminum sulfate, polyaluminum chloride, ammonium alum, potassium alum, coppar chloride, sodium aluminate, activated silicic acid, basic aluminum chloride,
Examples thereof include calcium oxide, bentonite, magnesia and the like. Examples of the polymer flocculants of organic flocculants include cationic polymer flocculants, nonionic polymer flocculants, anionic polymer flocculants, cationic surfactants, anionic surfactants, and the like. Examples of the hydrophilic polymer coagulant include polyethyleneimine, dimethylaminomethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, dimethylaminomethyl (meth) acrylate and dimethylaminoethyl (meth) acrylate. Homopolymer of quaternary compound of dimethylaminopropyl (meth) acrylate, quaternary compound of dimethylaminomethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate or dimethylaminopropyl (meth) acrylate and (meth) acrylamide A copolymer of Mannich modified product of (meth) acrylamide or its quaternized product and Hoffmann degradation product of poly (meth) acrylamide, polyamine sulfone, polyvinyl imidazoline and polydimethyldiallylammonium chloride or a copolymer of dimethyldiallylammonium chloride and acrylamide, polydiallyl 4 Examples thereof include primary ammonium salts, polybutynyl imidazoline, epichlorohydrin-alkylene diamine condensates, and polyamide polyamines. Examples of the nonionic polymer flocculant include polyacrylamide, polyethylene oxand, polyvinyl alcohol, and the like, and examples of the anionic polymer flocculant include polyacrylamide hydrolyzate, polyvinyl sulfonate, sodium polyacrylate, polystyrene sulfone. Examples thereof include acids and polysulfomethylated polyacrylamide. Further, examples of the cationic surfactant include dodecylamine acetate and octadecylamine acetate, and examples of the anionic surfactant include sodium laurate and sodium dodecylbenzenesulfonate.

As other additives, auxiliary coagulants,
A neutralizer and a filter aid are mentioned. Examples of auxiliary coagulants include active silicic acid, sodium alginate, and clay.
Examples of neutralizing agents for pH and heavy metals include calcium oxide, sodium carbonate, sodium hydroxide, calcium hydroxide, calcium carbonate, magnesium oxide, magnesium hydroxide, and the like, and diatomaceous earth, perlite, asbestos fibers, cellulose as filter aids. Fiber, carbon powder, etc. can be mentioned.

As the sewage treatment method of the present invention, the sewage treatment method is characterized in that the sewage is brought into contact with the sewage treatment additive, and then the sludge treatment is carried out. After the sewage is brought into contact with the sewage treatment additive, After contacting the sewage with the sewage treatment additive, the treated sewage treatment additive is introduced into the sludge tank together with the treated sewage, and the sewage treatment method is characterized by sludge treatment,
A sewage treatment method characterized by mixing a sewage treatment additive into sludge and treating the sewage with sludge, and after treating the sewage with sludge, the sewage treatment additive is contacted with the treated water. Examples include sewage treatment methods, which can be used in combination.

After contacting the sewage with the sewage treatment additive,
According to a sewage treatment method characterized by sludge treatment, sewage with a reduced oil content is treated as sludge, so the BOD load on the sludge is reduced, and the drainage of sludge after sludge treatment is improved. It is possible to prevent the oil scum from adhering. After contacting the sewage with the sewage treatment additive, after contacting the sewage with the sewage treatment additive, introduce the treated sewage treatment additive together with the treated sewage treatment additive into the sludge tank to treat the sludge. According to a sewage treatment method characterized by mixing a sewage treatment method or a sewage treatment additive into sludge and treating the sewage with sludge, the BOD load on the sludge is reduced, and the sludge after the sludge treatment is treated. It is possible to improve the drainage of the product, prevent the oil scum from adhering to the equipment, and simultaneously incinerate the sludge during the incineration process. According to the sewage treatment method, which comprises treating the sewage with sludge and then contacting the sewage treatment additive with the treated water, it is possible to remove undecomposed oil mixed in the final treated water.

In the sewage treatment additive and sewage treatment method of the present invention, the oil-absorbing polymer (I) absorbs the oil in the sewage to reduce the BOD load on the sludge, and to reduce the sludge after the sludge treatment. In addition to improving drainage and preventing oil scum from adhering to equipment, it is possible to incinerate at the same time as the sludge incineration process.

[0053]

EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto. In the examples, parts and% are based on weight unless otherwise specified.

Reference Example 1 A 500 ml flask equipped with a thermometer, a stirrer, a gas inlet tube and a reflux condenser was charged with 3 parts of gelatin dissolved in 300 parts of water, and the inside of the flask was replaced with nitrogen while stirring. It heated at 40 degreeC under nitrogen stream. Then, 99.794 parts of nonylphenyl acrylate (SP value: 8.3) as the monomer (A), 0.206 parts of 1,6-hexanediol diacrylate as the crosslinkable monomer (B), and a polymerization initiator. As a solution, 0.5 part of benzoyl peroxide was added at once to the flask, and the mixture was vigorously stirred at 400 rpm.

Then, the temperature inside the flask was raised to 80 ° C. and maintained at the same temperature for 2 hours to carry out a polymerization reaction. Then, the temperature inside the flask was further raised to 90 ° C. and maintained for 2 hours to complete the polymerization. Thus, an aqueous dispersion of the sewage treatment additive (1) consisting of the oil-absorbent polymer (1) was obtained. The average particle diameter of the sewage treatment additive (1) was 100 to 1000 μm, and the content of the sewage treatment additive (1) in the obtained aqueous dispersion was 25.5%.

Reference Example 2 In Reference Example 1, as the monomer (A), i-butylmethacrylate (SP value:
7.5) Same as Reference Example 1 except that 59.815 parts, stearyl acrylate 39.877 parts, and 1,6 hexanediol diacrylate 0.308 parts as the crosslinkable monomer (B) were used instead. By the method, an aqueous dispersion of the sewage treatment additive (2) consisting of the oil-absorbent polymer (2) was obtained. The average particle size of the sewage treatment additive (2) is 10
The content of the sewage treatment additive (2) in the obtained water dispersion was 25.0%. Then, the granular product was filtered off, washed with water and dried at 60 ° C. to obtain a sewage treatment additive (2) having a particle size of 100 to 1000 μm.

Reference Example 3 Vinyl laurate (SP value: 7.9) 9 as the monomer (A) in Reference Example 10
A water dispersion of the oil-absorbent polymer (3) was carried out in the same manner as in Reference Example 1 except that 9.811 parts and 0.187 part of trimethylolpropane triacrylate as the crosslinkable monomer (B) were used instead. A liquid was obtained. The average particle diameter of the oil absorbing polymer (3) was 100 to 1000 μm, and the content of the oil absorbing polymer (3) in the obtained aqueous dispersion was 25.0%.

Then, 15 parts of calcium stearate was added to a 300 ml flask equipped with a stirrer, and 325 parts of an aqueous dispersion containing this oil-absorbing polymer (3) was gradually added thereto.
Stirring was continued for a minute to obtain granular material (3) composed of the polymer and calcium stearate. Furthermore, this granular material is
The average particle size is 100-1000μ
A sewage treatment additive (3) consisting of m particles (3) was obtained. The content of the oil absorbing polymer (3) in the obtained granular material (3) was 85.0%.

Reference Example 4 In a 500 ml flask equipped with a baffle equipped with a thermometer, a stirrer, a gas introduction tube and a reflux condenser, 3 parts of polyethylene alkyl ether (manufactured by Nippon Shokubai Co., Ltd., trade name Softanol 150) was added to water 300 parts. Part of the flask was charged, and the inside of the flask was replaced with nitrogen while stirring, and the flask was heated to 40 ° C. under a nitrogen stream. Then, as the monomer (A), dodecyl acrylate (SP value: 7.9) 57.77
2 parts and N, N-dioctyl acrylamide (SP
Value: 8.2) A solution containing 38.515 parts, polypropylene glycol dimethacrylate (molecular weight 4000) 3.713 parts as the crosslinkable monomer (B), and benzoyl peroxide 0.5 part as a polymerization initiator was placed in the flask. And stirred vigorously under the condition of 750 rpm.

Then, the temperature inside the flask was raised to 80 ° C. and maintained at the same temperature for 2 hours to carry out the polymerization reaction. Then, the temperature inside the flask was further raised to 90 ° C. and maintained for 2 hours to complete the polymerization. By doing so, an aqueous dispersion (resin content 25% by weight) containing the oil-absorbent polymer (4) having an average particle diameter of 30 μm was obtained.

Fine particles (average particle size 4 μm) of hydrophobic silica (Nipseal SS-70, methanol value 65, made by Nippon Silica) in an aqueous solution prepared by dissolving 1.5 parts of the polyoxyethylene alkyl ether in 150 parts of water. ) 1 part and fine particles of aluminum stearate (average particle size 5μ
m) 4 parts were added and stirred under the condition of 300 rpm to obtain an aqueous dispersion of hydrophobic silica and aluminum stearate.
Then, 60 parts of an aqueous dispersion containing the oil absorbing polymer (4) was gradually added and stirring was continued for 10 minutes to obtain an aggregate consisting of the oil absorbing polymer, hydrophobic silica and aluminum stearate. Further, the aggregate was filtered, dried at 80 ° C., and then crushed to obtain a sewage treatment additive (4) consisting of a granular material (4) having an average particle diameter of 2 mm. The obtained granular material (4)
Is composed of 15 parts of oil-absorbing polymer (4) and 1 part of hydrophobic silica.
Parts and 4 parts aluminum stearate.

Reference Example 5 In Reference Example 4, 2-ethylhexyl acrylate (SP) was used as the monomer (A).
Value: 8.4) Average particle size by the same method as in Reference Example 4 except that 99.796 parts and 0.39 part of 1,9 nonanediol diacrylate as the crosslinkable monomer (B) were used instead. A sewage treatment additive (5) consisting of 2 mm of granular material (5) was obtained. The composition of the obtained granular material (5) was 15 parts of the oil absorbing polymer (5), 1 part of hydrophobic silica and 4 parts of aluminum stearate.

Reference Example 6 A glass casting mold for polymerization (a tray having a size of 5 × 5 × 1 cm) equipped with a thermometer and a gas inlet tube was used, and dodecyl acrylate (SP value) was used as the monomer (A). : 7.9) 99.823 parts, ethylene glycol diacrylate 0.1 as the crosslinkable monomer (B)
Injecting a mixed solution of 77 parts and 0.1 part of 2,2′-azobisdimethylvaleronitrile as a polymerization initiator,
The polymerization reaction was carried out by heating at 60 ° C. for 2 hours under a nitrogen stream, after which the temperature was raised to 80 ° C. and maintained for 2 hours to complete the polymerization. After allowing to cool, the gel-like material was peeled from the mold, and crushed at a temperature not higher than the glass transition point to obtain a sewage treatment additive (6) made of an oil-absorbing polymer (6) having an average particle diameter of 1 mm.

Reference Example 7 Hexadecyl methacrylate (SP value:
7.8) 49.930 parts and N-octylmethacrylamide (SP value: 8.6) 49.930 parts, except that divinylbenzene 0.140 part was used as the crosslinkable monomer (B) instead. By the same method as in Reference Example 6, an additive (7) for treating sewage consisting of an oil-absorbent polymer (7) having an average particle size of 1 mm was obtained.

Reference Example 8 In Reference Example 5, cyclohexylmethacrylate (SP value:
8.3) By the same method as in Reference Example 6 except that 99.771 parts by weight and 0.229 parts of N, N'methylenebisacrylamide as the crosslinkable monomer (B) were used instead, An sewage treatment additive (8) consisting of the oil-absorbent polymer (8) was obtained.

Reference Example 9 Isobornyl acrylate (SP value: 8.
4) An average particle size of 1 m was obtained in the same manner as in Reference Example 6 except that 99.796 parts and 0.204 part of ethylene glycol diacrylate as the crosslinkable monomer (B) were used instead.
A granular material of the sewage treatment additive (9) comprising the oil-absorbent polymer (9) of m was obtained.

Reference Example 10 The norbornene-based oil-absorbing polymer was NORSOREX manufactured by France CdF.
(Glass transition temperature 35 ° C., molecular weight of 2,000,000 or more) was used as the oil-absorbent polymer (10), and the sewage treatment additive (10) made of the oil-absorbent polymer (10) was used.

Reference Example 11 500 equipped with a thermometer, a stirrer, a gas inlet tube, two dropping funnels and a reflux condenser
In a ml flask, 3 parts of polyoxyethylene glycol (degree of polymerization: 17) monononylphenyl ether and 100 parts of water.
The flask was charged, the inside of the flask was replaced with nitrogen while stirring at 300 rpm, and the flask was heated to 70 ° C. under a nitrogen stream.

On the other hand, t-butylstyrene (SP value: 7.9) 54.881 parts and 1-decene (SP value: 7.0) 44.903 parts as the monomer (A), a crosslinkable monomer As the monomer (B), a monomer composed of 0.216 parts of divinylbenzene was added to polyoxyethylene glycol (degree of polymerization 17).
In an aqueous solution prepared by dissolving 3 parts of monononylphenyl ether in 150 parts of water, a homogenizer was used for mixing for 10 minutes at 5000 rpm to prepare 253 parts of an aqueous dispersion of a monomer. Further, 1 part of sodium persulfate as a polymerization initiator was dissolved in 50 parts of water to prepare 51 parts of an aqueous solution of the polymerization initiator.

Each of the aqueous dispersion of the monomer and the aqueous solution of the polymerization initiator was placed in a separate dropping funnel, and 50 parts of the aqueous dispersion of the monomer and 5 parts of the aqueous solution of the polymerization initiator were placed in a flask. Polymerization started. Then, while maintaining the inside of the flask under a nitrogen stream at 70 ° C., the remaining aqueous dispersion of the monomer was dropped over 120 minutes, and at the same time, the remaining aqueous sodium persulfate solution was dropped over 240 minutes. After completion of the dropping, the mixture was maintained at 70 ° C. for 120 minutes to complete the polymerization to obtain an aqueous dispersion of the sewage treatment additive (11) consisting of the oil absorbing polymer (11). The average particle diameter of the sewage treatment additive (11) was 0.2 μm, and the content of the sewage treatment additive (11) in the obtained aqueous dispersion was 25.5%.

Reference Example 12 In Reference Example 10, as the monomer (A), nonylphenyl acrylate (SP value:
8.3) 74.793 parts and hydroxyethyl acrylate (SP value: 10.3) 24.931 parts, and 1,6-hexanediol diacrylate 0.276 part as the crosslinkable monomer (B) are used instead. Reference example 10 except that
An aqueous dispersion of the oil absorbing polymer (12) was obtained by the same method as described in (1) above. The average particle diameter of the sewage treatment additive (12) was 0.15 μm, and the content of the sewage treatment additive (12) in the obtained aqueous dispersion was 25.0%.

Reference Example 13 In Reference Example 10, t-butyl acrylate (SP value: 8.
7) 98.991 parts, polyethylene glycol diacrylate (molecular weight 500) as crosslinkable monomer (B) 0.
An aqueous dispersion of oil-absorbent polymer (13) was obtained in the same manner as in Reference Example 10 except that 204 parts were used instead. The average particle diameter of the sewage treatment additive (13) is 0.15 μm.
m, and the sewage treatment additive (1
The content of 3) was 25.0%.

Reference Example 14 In Reference Example 10, stearyl acrylate (SP value: 7.
8) 99.855 parts, 1,4 as the crosslinkable monomer (B)
An aqueous dispersion of oil-absorbent polymer (14) was obtained in the same manner as in Reference Example 10 except that 0.145 parts of butanediol diacrylate was used instead. The average particle diameter of the sewage treatment additive (14) was 0.2 μm, and the content of the sewage treatment additive (13) in the obtained aqueous dispersion was 25.
It was 0%.

(Reference Example 15) Reference examples 1 to 1 were added to this aqueous dispersion.
For the sewage treatment, 1 part of each of the sewage treatment additives (1) to (5) obtained in No. 5 was filled into a bag of polypropylene spunbonded non-woven fabric of 3 x 3 cm square (50 g / m2 of basis weight) per solid content. Additives (15) to (19) were obtained.

Reference Example 16 Reference examples 1 to 1 were added to this aqueous dispersion.
80 parts of each of the sewage treatment additives (1) to (5) obtained in No. 14 in terms of solid content were converted into polypropylene short fibers (PP).
Chop 3 mm) 10 parts and heat-meltable fiber (EP fiber)
Oil-absorbent sheet (1) with 10 parts of polypropylene spunbonded non-woven fabric (Basis weight 50 g / m2) rubbed into a polypropylene nonwoven fabric with a basis weight of 400 g / m2 after being melted and dried in a dryer. (5) was obtained. Further, it is cut into a 6 × 6 cm square, folded back from the center so that the resin is on the inner surface, and heat-sealed on three sides, thereby forming a 3 × 6 cm square porous oil-absorbent additive (20) to ( 24) was obtained.

Example 1 For treating the sewage obtained in Reference Examples 1 to 10 and 15, 16, 4000 parts of sewage adjusted to 10,000 ppm by adding soybean oil to the basic culture solution was placed in a beaker equipped with a turbine stirrer. Additives (1) to (1
0) and (15) to (24) 10 parts were added to obtain 100
Mix for 10 minutes at rpm.

The basal culture solution adjustment method and sludge adjustment method are described in the MIT guideline “301C” modified MITI.
It carried out based on the test (I).

The treated liquid was filtered through a 200-mesh net to remove the sewage treatment additive after oil absorption, and 3000 parts of the filtrate and activated sludge (pH 5.9, SS 2.0%, VSS / SS).
82.2%) 150 parts into a flask equipped with an aerator,
The activated sludge was treated by aeration at 25 ° C for 24 hours. The treated liquid was allowed to stand to obtain 150 parts of sludge (SS 2.0%).
After that, in a container equipped with a thermometer, turbine blade agitator,
The sludge liquid and 1.5 parts of a 0.2% aqueous solution of quaternary dimethylaminomethyl arylate were added and stirred at 250 rpm for 30 seconds to aggregate the sludge. 100 coagulated sludge
Pour it on the Buchner funnel lined with mesh nylon filter cloth,
The amount of filtrate after 10 seconds and the concentration of n-hexane extracted from the filtrate were measured by JI.
Table 1 shows the result of measurement according to SK102. Then, the sludge after being filtered for 2 minutes was sandwiched between polyester filter cloths used for a belt press dehydrator, and the sludge was dried at 0.5 g / cm 2
Table 1 shows the results of measuring the water content of the sludge (cake) after dewatering by pressing and dewatering.

Example 2 4000 parts of sewage adjusted to 10000 ppm by adding soybean oil to a basal culture was charged into a beaker equipped with a turbine stirrer, and the sewage treatment additive (1) obtained in Reference Examples 1 to 14 was added. )-(14) 10 parts were added and mixed at 100 rpm for 10 minutes. A mixed solution of the treated liquid and the sewage treatment additive after oil absorption (3000 parts) and Example 1
150 parts of the activated sludge used in 2 was placed in a flask equipped with an aerator, and aerated at 25 ° C. for 24 hours to treat the activated sludge. The treated liquid was allowed to stand still to obtain a mixture of 150 parts of sludge and a sewage treatment agent. Then, to a container equipped with a thermometer and a turbine blade stirrer, 1.5 parts of a 0.2% aqueous solution of the above sludge liquid and quaternary dimethylaminomethyl allylate were added and 250
The sludge was aggregated by stirring at rpm for 30 seconds. The coagulated sludge was poured onto a Buchner funnel lined with a 100-mesh nylon filter cloth, and after 10 seconds, the amount of the filtrate and the n-hexane extraction concentration of the filtrate were measured. Next, the sludge after being filtered for 2 minutes was sandwiched between polyester filter cloths used in a belt press dehydrator and squeezed and dehydrated at 0.5 g / cm 2 for 2 minutes,
Table 2 shows the results of measuring the water content of the sludge (cake) after dehydration.
Shown in Further, after this, the sludge (cake) after dehydration was dried and burned at 800 ° C. under strong heat, but it could be burned without any problem, and the sewage treatment additive did not remain in the ash.

(Example 3) A 2 L beaker equipped with an aeration device was prepared by adding engine oil to the basal culture solution to 10,000.
4000 parts of sewage adjusted to ppm, 150 parts of activated sludge used in Example 1, 10 parts of the sewage treatment additives (1) to (14) obtained in Reference Examples 1 to 14 were added, and the condition was 25 ° C. It was aerated under and treated with activated sludge. The treated liquid is allowed to stand and 160 parts of a mixture of sludge and an additive for sewage treatment (SS2.0
%) Was obtained. Then, to a container equipped with a thermometer and a turbine blade stirrer, 1.5 parts of a 0.2% aqueous solution of the sludge liquid and quaternary dimethylaminomethyl allylate were added and added to the container.
Agitation was carried out by stirring at 50 rpm for 30 seconds. Table 3 shows the results of pouring the coagulated sludge onto a Buchner funnel lined with a 100-mesh nylon filter cloth and measuring the filtrate amount and the n-hexane extraction concentration after 10 seconds. Next, the sludge after being filtered for 2 minutes was sandwiched between polyester filter cloths used for a belt press dehydrator, and was squeezed and dehydrated at 0.5 g / cm 2 for 2 minutes to measure the water content of the sludge (cake) after dehydration. The results are shown in Table 3. After this, the sludge (cake) after dehydration is dried,
It was incinerated by ignition at 00 ° C, but it could be incinerated without any problems, and no sewage treatment additive remained in the ash.

(Example 4) A 2 L beaker equipped with an aerator was added with engine oil to the basal culture solution to obtain 10,000.
4000 parts of sewage adjusted to ppm and 150 parts of the activated sludge used in Example 1 were added and aerated under the condition of 25 ° C. for activated sludge treatment. The treated liquid was allowed to stand to obtain 150 parts of sludge. Then, the sludge liquid and 3 parts of a 0.2% aqueous solution of polyferric sulfate were added to a container equipped with a thermometer and a turbine blade stirrer, and stirred at 250 rpm for 30 seconds to cause aggregation. Coagulated sludge is poured onto a Buchner funnel lined with a 100-mesh nylon filter cloth, filtered for 2 minutes, and then sandwiched between polyester filter cloths used in a belt press dehydrator to give 0.5 g / cm 2.
Pressed and dehydrated at 2 for 2 minutes.

Next, 300 parts of the above filtrate and Reference Examples 1 to 16
Add the sewage treatment additives (1) to (24) obtained in step 1 to a container equipped with a thermometer and a turbine blade agitator,
After mixing at 0 rpm, the sewage treatment additive was filtered off, and the n-hexane extraction concentration of the filtrate was measured. The results are shown in Table 4.
Shown in

(Comparative Example 1) The same operation as in Example 1 was conducted except that the sewage treatment additive was not used, and the filtrate amount after 10 seconds, the n-hexane extraction concentration of the filtrate, and the water content of the sludge (cake). The results of measuring the rate are shown in Table 1.

Comparative Example 2 The same operation as in Example 2 was carried out except that the sewage treatment additive was not used, and the amount of the filtrate after 10 seconds, the n-hexane extraction concentration of the filtrate, and the water content of the sludge (cake). The results of measuring the rate are shown in Table 2.

Comparative Example 3 The same operation as in Example 3 was carried out except that the sewage treatment additive was not used, and the amount of filtrate after 10 seconds, the n-hexane extraction concentration of the filtrate, and the water content of the sludge (cake). The results of measuring the rate are shown in Table 3.

Comparative Example 4 Table 4 shows the results of measuring the n-hexane extraction concentration of the filtrate by the same procedure as in Example 4, except that the sewage treatment additive was not used.

[0087]

[Table 1]

[0088]

[Table 2]

[0089]

[Table 3]

[0090]

[Table 4]

[0091]

The sewage treatment additive and sewage treatment method of the present invention are based on an oil-absorbing polymer obtained by polymerizing a specific lipophilic monomer component, and sewage used as a sewage treatment additive is treated. It is something to process.

The oil-absorbent polymer forming the oil-absorbing material used in the present invention has a large absorption capacity and retention capacity for oil components present at a high concentration on the water surface or oil components suspended in water. Even if the oil absorbing material once absorbing the oil is left in water for a long period of time, the oil is not re-released into the water, and the oil does not drip when collected.

Therefore, according to the sewage treatment method of the present invention,
To provide an additive for sewage treatment and a sewage treatment method capable of reducing load on sludge in sewage treatment, improving drainage of sludge, reducing adhesion of scumified oil to equipment, and incinerating simultaneously with sludge. You can

Therefore, the sewage treatment method of the present invention is not limited to a large-scale sewage treatment plant, and is also applicable to sewage such as small and medium-sized enterprises and small-scale domestic sewage, especially when it is difficult to introduce a large-scale treatment device. It is extremely effective as a method that can be simply processed.

Claims (10)

[Claims] 1. A unit amount containing as a main component a monomer having a solubility parameter (SP value) of 9 or less and containing 50% by weight or more of the monomer (A) having one polymerizable group in the molecule. An additive for treating sewage, comprising an oil absorbing polymer (I) obtained by polymerizing a body component. 2. The oil-absorbent polymer (I) is the monomer (A) 9
6 to 99.999% by weight and 0.000 of a crosslinkable monomer (B) having at least two polymerizable unsaturated groups in the molecule
The sewage treatment additive according to claim 1, which is obtained by polymerizing a monomer component consisting of 1 to 4% by weight (however, the total amount of the monomers (A) and (B) is 100% by weight). Agent. 3. The oil-absorbent polymer (I) is a granular material (II).
The sewage treatment additive according to claim 1. 4. The particulate matter (II) is a particulate matter comprising 30 to 99 parts by weight of the oil-absorbent polymer (I) and 1 to 70 parts by weight of a water-insoluble powder, and the particulate matter (II ) An additive for treating sewage, comprising: 5. A sewage treatment additive obtained by filling the oil-absorbent polymer (I) and / or the particulate matter (II) in an oil-permeable bag. 6. An additive for treating sewage, comprising a porous base material carrying the oil absorbing polymer (I) and / or the particulate material (II). 7. A sewage treatment method, which comprises treating sludge after contacting sewage with the sewage treatment additive according to any one of claims 1 to 6. 8. The sewage is brought into contact with the sewage treatment additive according to claim 1, and the treated sewage treatment additive is introduced into a sludge tank together with the treated sewage. A sewage treatment method comprising treating the sewage. 9. A sewage treatment method comprising mixing the sewage treatment additive according to any one of claims 1 to 6 into sludge and treating the sewage with sludge. 10. The method according to claim 1 after treating sewage with sludge.
7. The sewage treatment method, wherein the sewage treatment additive according to any of 6 is brought into contact with the treated water.