CN1539754A - Treatment agent and treatment process using same, treatment process of waste liquor - Google Patents
Treatment agent and treatment process using same, treatment process of waste liquor Download PDFInfo
- Publication number
- CN1539754A CN1539754A CNA2004100353546A CN200410035354A CN1539754A CN 1539754 A CN1539754 A CN 1539754A CN A2004100353546 A CNA2004100353546 A CN A2004100353546A CN 200410035354 A CN200410035354 A CN 200410035354A CN 1539754 A CN1539754 A CN 1539754A
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- waste liquid
- acid
- treating agent
- treating
- organic acid
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
To obtain a treatment agent for treating wastewater mixed with a resin, to provide a treatment method using the same and a waste liquid treatment method. The treatment agent comprises an organic acid dissolved in water to show acidity and a substance dissolved in water to precipitate cohesive ions. The resin is flocculated and separated by adding the treatment agent containing the organic acid to a waste liquid containing a large amount of the resin. Further, the waste liquid treatment method has a step for peeling wax applied to the floor of a structure by using water mixed with an alkaline chemical agent and a step for flocculating the resin contained in the waste liquid by adding a substance dissolved in water to show acidity to the waste liquid containing the wax.
Description
Technical Field
The present invention relates to a treatment agent for treating wastewater mixed with a resin, a treatment method using the treatment agent, and a waste liquid treatment method.
Background
In general, floors of buildings, commercial facilities, factories, and the like are regularly waxed to ensure clean floors, and before waxing, the previously applied wax is peeled off together with dirt, and clean floors are regenerated and then decorated with new wax. In this case, the old floor wax portion having a dull adhesive dirt is usually peeled off and removed by using a special peeling agent (mainly an alkaline agent containing a solvent). The waste floor wax-stripping liquid thus produced contains various dirt components, a resin component as a wax component, an alkali solvent such as alkanolamine, various surfactants, and the like. Currently, the personnel responsible for building cleaning usually dump the floor wax stripping waste into the sewer water.
If environmental concerns are taken into account, it is a problem to be avoided to discard waste liquids containing these harmful components directly into sewage. However, although these building cleaning workers have recognized this problem, they have been still disposed of directly poured into sewage, and from the standpoint of environmental protection, a simple and inexpensive treatment method for stripping waste liquid from floor wax is strongly demanded.
In order to solve the above problems, several treatment methods have been proposed, and one of them is a method of adding an inorganic salt to the waste liquid and then filtering the mixture (see patent document 1).
[ patent document 1]
Japanese laid-open patent publication No. 2000-301162
Disclosure of Invention
However, the direct discharge of such waste streams without treatment is still ubiquitous. Therefore, when the waste liquid containing the resin component is discarded and poured into a closed waterway such as a general pipe, the resin component contained in the waste liquid may be solidified inside the closed waterway to block the closed waterway. Further, since the waste liquid is strongly alkaline with a pH of about 14, it has a problem that it must be neutralized for discharge to the natural world.
In addition, in the method of filtering waste liquid by adding inorganic salts, since the filtering treatment is required, there is a problem that the treatment cost is increased.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a treatment agent capable of treating a waste liquid containing a large amount of resin components, a treatment method using the treatment agent, and a treatment method of a waste liquid.
The treating agent of the present invention is characterized by comprising an organic acid which is acidic when dissolved in water and a substance which dissolves in water and precipitates a coherent ion.
The treatment method of the present invention is characterized in that a treatment agent containing a water-soluble acidic substance is added to a waste liquid mixed with a resin to change the pH of the waste liquid and thereby coagulate the resin.
The method for treating waste liquid of the present invention is characterized by comprising a step of stripping off wax or paint containing a resin component with an alkaline solvent, a step of adding a treating agent containing a water-soluble acidic substance to the waste liquid containing the wax or paint to coagulate the resin contained in the waste liquid, and a step of removing the resin from the waste liquid.
[ brief description of the drawings]
FIG. 1 is a schematic view illustrating a treatment method using the treating agent of the present invention.
FIG. 2 is a process diagram for explaining the method of treating waste liquid according to the present invention.
[ description of symbols]
1 waste liquid
2 resin
3 stirring rod
4 treating water
Embodiments of the invention
First, the treating agent, the treating method using the treating agent, and the waste liquid treating method of the present invention will be described.
So-called floor-waxing treatment, usually in the range of 5-20mL/m2In a ratio of epoxy-containing resin or acrylic resinAnd the like, and the wax is repeatedly applied 1 to 5 times. The stripping of the floor wax means that the previous wax surface is stripped together with the dirt before the new wax is applied, and the clean floor surface is regenerated, usually at the pressure of 100-2The ratio of (A) to (B) is such that a release agent as an alkali solvent is applied to the floor to release the wax. The stripping agent contains a solvent for liquefying the wax resin component, and usually the solvent is caustic soda [ NaOH]]. The waste floor wax stripping liquid is the resultant waste liquid containing various dirt and floorWax components, release agent components, and the like are generally opaque waste liquids. The waste liquid contains a large amount of resin components liquefied by the action of the solution contained in the stripping liquid. The waste liquid is a strong alkali having a pH of about 14.
The present invention can be applied to any of the floor wax stripping waste liquids containing any of the floor waxes and stripping agents which are generally used. Especially, the effect on the waste liquid of the floor wax mainly containing epoxy resin or acrylic resin is particularly great.
<embodiment 1: description of treating agent>
First, the treating agent of the present invention will be explained. The treating agent of the present invention comprises an organic acid which is acidic when dissolved in water and a substance which precipitates a coherent ion when dissolved in water.
The organic acid is an organic compound which is acidic when dissolved in water. In addition, when the treated water subjected to the coagulation treatment is discharged to the natural world, the organic acid is preferably a natural organic acid. Examples of such natural organic acids include malic acid [ C]6H8O7]Acetic acid [ CH]3COOH]Oxalic acid [ H]2C2O4]Tartaric acid [ (CHOH, CO)2H)2]Benzoic acid [ C]6H5COOH]And the like. Among them, malic acid (also referred to as hydroxysuccinic acid) is most suitable for use because it is a food additive, easy to handle, and less in odor. When the organic acid is contained in an amount of 50% by weight or more, the coagulation effect can be improved. Further, since a drug other than the organic acid is also mixed in the treating agent, the organic acid accounts for 50 wt% or more and 85 wt% or more of the treating agent in consideration of such a case% or less.
Particularly, since malic acid is neutral or weakly alkaline in a powder state, it is easy to handle without any harm even if an operator directly touches it. Further, the treatment agent may be prepared in a state where the powder is solidified into a tablet. The handling of the treating agent is therefore easier.
The natural organic acid is dissolved in water to form strong acid with pH of about 1. Taking malic acid as an example, the following chemical reaction is shown:
as shown in the above chemical formula, malic acid is dissolved in water to generate carbon dioxide. The waste liquid is acidified by the carbon dioxide.
As the substance which dissolves in water and precipitates the aggregating ions, a substance containing potassium or aluminum can be used. Potassium alum KAl (SO) may be suitably used4)2Or aluminium sulphate Al2(SO4)3. The substance from which such ions are precipitated has a function of promoting the formation of flocs or the sedimentation thereof after metal ions generated by dissolution in water are bonded to impurities. In addition, the potassium alum and the aluminum sulfate both have sulfate radicals. Therefore, the sulfate radical is dissolved in the waste liquid to make the waste liquid acidic. Thus, the effect of the organic acid described above can be complemented by sulfate.The proportion of the substance that dissolves in water and precipitates the aggregating ions in the entire treatment agent may be, for example, about 15% by weight.
When the treating agent is supplied inthe form of powder, the components constituting the treating agent may be stirred and then packaged in predetermined amounts for each package.
<embodiment 2: description of treatment method>
Hereinafter, a method of treating waste liquid using the above-mentioned treating agent will be described. The treatment method of the present invention is a method of aggregating a resin by adding a treatment agent containing a substance which is dissolved in water and is acidic to a waste liquid into which the resin is mixed, and changing the pH of the waste liquid.
The amount of the substance which is acidic when dissolved in water to be added to the waste liquid is not particularly limited, and may be such that the pH is changed to a level that promotes the bonding between the resins contained in the waste liquid. As the substance which is acidic when dissolved in water, various natural organic acids can be used as described above. The waste liquid according to the present invention is a waste liquid in which resin molecules such as epoxy resin as a wax component are dissolved in water by using an alkaline solvent. In the present invention, the alkaline solvent (caustic soda [ NaOH]) can be made weak by adding a natural organic acid to the waste liquid. Therefore, the resin components in the waste liquid are aggregated with each other by the adhesive force of the resin itself. Thus, the resin component is flocculated by adding the natural organic acid and then leaving it to stand. In addition, the floc floats or precipitates depending on the concentration of the waste liquid. In either case, solid-liquid separation of the resin and the liquid becomes easy.
Referring to fig. 1, after adding a natural organic acid, the coupling between the resins can be promoted by stirring the waste liquid. Here, the results of the experiment using the beaker for experiment will be described.
Referring to fig. 1(a), the resin is liquefied by the solvent in the waste liquid 1 before the natural organic acid is added. Therefore, the waste liquid contains resins, solvents, impurities, and the like, and is a fluid with low transparency. In addition, since the resin is liquefied by the solvent, the resin component does not precipitate even when it is left as it is.
Referring to fig. 1(B), after the treatment agent of the present invention is added to the waste liquid 1, the waste liquid 1 is stirred by using a stirring rod 3. Thus, since the natural organic acid contained in the treating agent is dissolved in the waste liquid, the pH of the waste liquid tends to be acidic, and the action of the solvent for dissolving the resin in the waste liquid can be weakened. Therefore, by stirring the waste liquid 1 with the stirring rod 3, the chance of the resins contacting each other is increased, and the flocs formed by the resins 2 are gradually increased. Here, the external force is applied to the waste liquid by using the stirring rod 3, but the external force may be applied by another method. Specifically, the external force may be applied by bubbling the waste liquid or applying ultrasonic waves to the waste liquid.
Referring to FIG. 1(C), the flocs of the resin 2 gradually grow by further stirring for several minutes, and finally become a lump, that is, the treatment agent is added and the waste liquid is stirred, whereby the resin 2 formed into one lump can be taken out. The treatment agent added to the waste liquid 1 contains a substance containing a coherent ion such as potassium alum or aluminum sulfate in addition to the natural organic acid. The aggregating ions also precipitate components other than the resin component contained in the drainage water. Therefore, the resin 2 in the lump contains not only the resin component but also other components contained in the waste liquid 1. Here, the other components include, for example, an additive contained in the floor polish and an additive contained in the release agent.
By the above operation, the waste liquid containing a large amount of resin components can be separated into the resin and the treated water 4. The treated water 4 may be neutralized by removing the resin components and the like, and adding a natural organic acid. Therefore, the treatment liquid obtained by the above operation can be discharged into nature such as a river if it meets the discharge standard. Further, it is also an advantage of the present invention that the resins contained in the waste liquid are taken out in one piece by utilizing the adhesion between the resins. Further, by extruding the resin to be a solid substance using pressure or the like, the water content of the solid substance can be reduced, and the weight of the solid substance can be reduced.
<embodiment 3: description of waste liquid treatment method>
Hereinafter, a method of treating waste liquid by using the above-mentioned treating agent and treating method will be described. Referring to the process diagram of FIG. 2, the waste liquid treatment method of the present invention includes a step of stripping a wax or paint containing a resin component with an alkaline solvent, a step of adding a treatment agent containing a substance which is acidic when dissolved in water to a waste liquid containing the wax or paint to coagulate the resin contained in the waste liquid, and a step of removing the resin from the waste liquid.
Floors of buildings and commercial facilities are maintained to ensure that the floor surfaces are clean. The maintenance is to peel off old wax formed on the floor surface, clean the wax and form new wax on the floor surface, and the treating agent and the treating method can be used for the purification treatment of waste liquid generated when the old wax is peeled off. This will be described in detail below.
First, old wax formed on the floor surface of a building is peeled off. Specifically, in order to peel off the old wax, a release agent is applied to the surface thereof, and the amount of the release agent applied may be, as described aboveIs 100-200mL/m2Left and right. In addition, the amount of the release agent is adjusted according to the coating thickness of the old wax and the release effect of the release agent. The stripping agent used here is a strongly basic agent containing a solvent for liquefying the resin component as a main component of the wax, and has a pH of about 14. Usually, this solvent is caustic soda [ NaOH]]. After the surface of the used wax is coated with the release agent, the used wax is peeled and removed from the floor surface by brushing with a brush or the like. The resulting waste liquid is collected in a container such as a bucket. After removing the old wax, a new wax is applied.
Then, a treatment agent is added to the waste liquid generated in the above operation, whereby the resin component contained in the waste liquid is coagulated. The treating agent mainly comprises natural organic acid. Here, as the natural organic acid, malic acid is preferably used as described above. Since malic acid is a food additive, it is a reagent excellent in safety and ease of handling. The treating agent may contain potassium alum or aluminum sulfate in addition to the natural organic acid. Potassium alum or aluminum sulfate dissolves in water to generate metallic ions, and therefore impurities other than resin contained in the waste liquid can be removed by utilizing the coagulation effect of the metallic ions. The insoluble portion (potassium or aluminum) of potassium alum or aluminum sulfate functions as a catalyst, and the effect of removing impurities contained in the waste liquid can be further enhanced.
Further, when the treatment agent is added to the waste liquid and the waste liquid is stirred, the coagulation effect of the treatment agent can be further improved. The stirring may be performed by a dedicated machine, by a manual stirring using a stirring bar, or by a method of sealing the container and vibrating. That is, if the solvent is weakened by the treating agent and the chance of contact between the resins having increased adhesion is increased, any method may be employed. In this way, impurities such as resin components contained in the waste liquid can be taken out as one or more pieces.
By the above-described operation, the waste liquid is separated into a cake mainly formed of resin and treated water. The natural organic acids, potassium alum and aluminum sulfate which constitute the treating agent are all substances existing in nature. Therefore, if the treated water meets the discharge standard, it can be discharged directly into a river or the like. The block formed mainly of resin may also be disposed of directly as waste. In this way, since only the solid matter forming the lump is treated as waste, the amount of waste discharged can be reduced.
In the above description, the waste liquid mixed with the peeled floor wax is described as the object of treatment, but other waste liquids may be treated by the method of the present invention. For example, a waste liquid containing a paint produced in a painting plant or the like may be treated by the method of the present invention.
Effects of the invention
By using the treating agent and the treating method of the present invention, a waste liquid containing a large amount of resin components can be separated into a solid matter formed of resin and treated water. The natural organic acid and the like contained in the treating agent of the present invention are basically harmless substances. Therefore, the treatment of the aggregate is easy, and the treated water can be discharged to the natural world without any problem. In particular, when malic acid is used as a natural organic acid contained in a treating agent, the safety of the treating agent can be improved because malic acid is also a food additive.
Further, since the waste liquid contains a solvent which dissolves the resin and is strongly basic, the pH of the waste liquid can be made close to neutral by adding the treating agent of the present invention. Therefore, the neutralization treatment can be omitted, and the treatment of the waste liquid can be made easier.
Further, according to the method for treating waste liquid of the present invention, waste liquid generated when the used wax is peeled can be separated into solid matter such as resin and treated water by using a treating agent containing a natural organic acid. The treated water produced here can be discharged directly if it meets the discharge standards. Further, the amount of waste generated can be greatly reduced by using solid matter as waste. Therefore, the cost related to maintenance of floor wax and the like can be reduced.
Claims (20)
1. A treating agent characterized by comprising an organic acid which is acidic when dissolved in water and a substance which precipitates a coherent ion when dissolved in water.
2. The treating agent according to claim 1, wherein a natural organic acid is used as the organic acid.
3. The treating agent according to claim 2, wherein the natural organic acid comprises any one of malic acid, acetic acid, oxalic acid, tartaric acid, or benzoic acid.
4. The treating agent according to claim 2, wherein malic acid selected from food additives is used as the natural organic acid.
5. The treating agent according to claim 1, wherein the substance which dissolves in water and precipitates a coherent ion comprises potassium alum and/or aluminum sulfate.
6. The treating agent according to claim 1, wherein the organic acid is contained in an amount of 50 to 85% by weight.
7. A treatment method characterized in that a treatment agent containing a substance which is acidic when dissolved in water is added to a waste liquid mixed with a resin to change the pH of the waste liquid and thereby coagulate the resin.
8. The method of claim 7, wherein the substance is a natural organic acid.
9. The method of claim 8, wherein the natural organic acid comprises any one of malic acid, acetic acid, oxalic acid, tartaric acid, or benzoic acid.
10. The method of claim 7, wherein the treating agent comprises potassium alum and/or aluminum sulfate.
11. The treatment method according to claim 7, wherein the coagulation is promoted by applying an external force to the waste liquid.
12. The treatment method according to claim 7, wherein the treatment agent is added to the waste liquid in a tablet state.
13. The method of claim 7, wherein said treating agent is added in a powdered form to said waste stream.
14. The treatment method according to claim 7, wherein the waste liquid is alkaline, and the pH of the waste liquid is brought close to acidity by adding the treatment agent.
15. A waste liquid treatment method is characterized by comprising the following steps:
a step of peeling off the wax or paint of the resin component using an alkaline solvent,
a step of adding a treating agent to the waste liquid containing the wax or the paint, the treating agent containing a substance which is acidic when dissolved in water, and
and a step of taking out the resin from the waste liquid.
16. The method for treating a waste liquid according to claim 15, wherein the water-soluble acidic substance is a natural organic acid.
17. The method of treating a waste liquid according to claim 16, wherein the natural organic acid comprises any one of malic acid, acetic acid, oxalic acid, tartaric acid and benzoic acid.
18. The method of treating a waste liquid according to claim 15, wherein the treating agent contains potassium alum and/or aluminum sulfate.
19. The method of treating a waste liquid as claimed in claim 15, wherein the treating agent is added to the waste liquid in a tablet form.
20. The method of treating a waste liquid as claimed in claim 15, wherein said treating agent is added to said waste liquid in a powdery state.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP116505/2003 | 2003-04-22 | ||
| JP2003116505A JP2004321861A (en) | 2003-04-22 | 2003-04-22 | Treatment agent, treatment method using the same, and waste liquid treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1539754A true CN1539754A (en) | 2004-10-27 |
Family
ID=33496684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100353546A Pending CN1539754A (en) | 2003-04-22 | 2004-04-22 | Treatment agent and treatment process using same, treatment process of waste liquor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2004321861A (en) |
| KR (1) | KR20040091549A (en) |
| CN (1) | CN1539754A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4669808B2 (en) * | 2006-04-10 | 2011-04-13 | 株式会社グンビル | Polymer wax peeling waste liquid treatment method |
| JP4614979B2 (en) * | 2007-02-27 | 2011-01-19 | 株式会社グンビル | Polymer wax peeling waste liquid treatment method |
| JP5199758B2 (en) | 2008-07-04 | 2013-05-15 | ディバーシー株式会社 | Treatment method for floor polish peeling sewage and washing sewage |
| JP5222808B2 (en) * | 2009-08-07 | 2013-06-26 | 株式会社日立製作所 | Flocculant, sewage purification method using flocculant, and water purifier using flocculant |
-
2003
- 2003-04-22 JP JP2003116505A patent/JP2004321861A/en active Pending
-
2004
- 2004-04-14 KR KR1020040025634A patent/KR20040091549A/en not_active Application Discontinuation
- 2004-04-22 CN CNA2004100353546A patent/CN1539754A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004321861A (en) | 2004-11-18 |
| KR20040091549A (en) | 2004-10-28 |
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