JP2008246275A - Wax peeling wastewater treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wax peeling wastewater treatment method which enables the separation of wax-containing wastewater into a flocculated part and filtrate by a simple operation, and allow the filtrate to be discharged to a sewer because it contains only a small amount of matter and is harmless. <P>SOLUTION: Activated carbon powder is added into the wax-containing wastewater, and vigorous mixing is carried out so that zinc, nitrogen, phosphorus, etc. are sufficiently adsorbed by the activated carbon powder, and a coagulant is added thereto and agitated. Additionally water is added and agitated, and then the wastewater is left still for a predetermined time. Subsequently the wastewater is further agitated to form large flocculates, and the wastewater in which the flocculates have been formed is dehydrated by a dehydrator to be separated into primary filtrate and the flocculates. The flocculates are discarded as industrial waste, and the primary filtrate is subjected to filtration treatment with activated carbon to be discharged to a sewer as the secondary filtrate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  This invention treats sewage generated by peeling work when peeling old wax and applying new wax, and recoating work by recoating new wax over old wax when waxing floors such as buildings. The present invention relates to a wax peeling sewage treatment method.

  Conventionally, wax is applied to the floor surface to protect and polish the floor. The wax was periodically subjected to a peeling operation or a recoating operation, and sewage was generated at that time. The sewage produced by the recoating operation contains a cleaning agent and a small amount of wax resin and is neutral. The sewage generated in the peeling operation contains a release agent, a wax resin, a cleaning agent, and the like. Many release agents have a high alkalinity, and sewage also becomes alkaline. And the sewage which arises in each operation | work was processed as industrial waste for the tank etc. Alternatively, as disclosed in Patent Document 1, a flocculant or the like is mixed with sewage to agglomerate old wax components, and filtered through a colander to separate moisture and solids. The filtered water was discarded in sewage, and the aggregate remaining in the colander was treated as industrial waste.

Therefore, as disclosed in Patent Document 2, the waste liquid is neutralized and discarded using an organic acid that dissolves in water and exhibits acidity, and a treating agent that dissolves in water and precipitates cohesive ions. A processing method has also been proposed.
JP 2000-301162 A Japanese Patent Laid-Open No. 2004-321861

  In the former case of the above-described conventional technology, it has been difficult to transport and store the entire amount of sewage as industrial waste, and it has been expensive to process as industrial waste. Further, the method of separating the aggregate by adding a flocculant to the sewage needs to be left for a long time until the moisture is sufficiently removed in the filtration step, which is inconvenient and troublesome. Moreover, the dissolved substance remained in the filtered water | moisture content, and it was not so clean.

  Furthermore, the treatment method disclosed in Patent Document 2 uses a large amount of chemicals and is costly, and the removal of solid content in the waste liquid is not sufficient, and the wax component and other impurities remain in the waste liquid, which is not clean. It was.

  The present invention has been made in view of the above-mentioned problems of the prior art, and is separated into an agglomerated portion and filtered water by a simple operation. The filtered water is harmless with little dissolved matter and can be drained into the sewer. An object of the present invention is to provide a method for treating wax-peeling sewage.

  The present invention introduces activated carbon powder into sewage water containing wax and mixes the activated carbon powder so that zinc, nitrogen, phosphorus, etc. are sufficiently adsorbed, and adds a flocculant to the activated carbon powder. The mixture is allowed to stand for a predetermined time and further stirred to form large agglomerates. The sewage produced by the agglomerates is dehydrated by a dehydrator, and separated into primary filtered water and the agglomerates. This is a wax peeling sewage treatment method. The agglomerates are discarded as industrial waste, and the primary filtered water is subjected to filtration with activated carbon to obtain secondary filtered water, which is then drained into the sewer. Aggregates may be discarded after drying to reduce weight.

  In addition, the filtration treatment with activated carbon of the primary filtrate obtained by the dehydration treatment is performed by charging the primary filtrate into a filter bag containing activated carbon.

  Further, when the concentration of the sewage is high, the primary filtration water obtained by the dehydration treatment, the filtration treatment with activated carbon is stirred by putting activated carbon powder and granular activated carbon into the primary filtration water, Is added and stirred to form agglomerates, and the primary filtered water produced by the agglomerates is added to a filtration bag and filtered.

  The wax peeling sewage treatment method of the present invention is a simple process that takes out and drains relatively clean secondary filtered water from the sewage generated during the wax peeling and recoating operations on the floor, and discards the wax peeling sewage. Can be made easier. Furthermore, the amount of industrial waste can be reduced, the cost for disposal can be reduced, and the cleanup work can be facilitated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The wax peeling sewage treatment method according to this embodiment is a peeling work in which old wax is peeled off and new wax is applied when waxing a floor. This is a wax sewage treatment method for treating sewage generated in a recoating operation for overcoating with wax. The sewage generated by the recoating operation is neutral with a cleaning agent and a small amount of wax resin, and the sewage generated by the stripping operation includes a release agent, a wax resin, and a cleaning agent. Many of them are high, and sewage becomes alkaline.

  The equipment necessary for the wax peeling sewage treatment is a dehydrator 10 shown in FIG. The dehydrator 10 is formed by a compressor 12 and a flange 14. The compressor 12 is provided with a handle 16 made of resin or the like. The handle 16 is a donut-shaped handle, and a knob 16a is projected in a direction perpendicular to the handle surface. On the inner peripheral surface of the handle, a plurality of wide handle support portions that are slightly curved downward extend, and are integrally coupled to the outer periphery of a shaft portion 16b provided coaxially at the center position of the handle. The shaft portion 16b is fitted with an upper end portion of a shaft 18 made of stainless steel or the like having a male screw on the entire side surface, and is fixed so as not to rotate.

  A square columnar screwing portion 20 provided with a female screw hole 20a through which the male screw is screwed and penetrated is engaged with the shaft 18 so as to be relatively rotatable. The threaded portion 20 is provided with a metal rod-like long plate 22 having an appropriate thickness from both sides of the symmetrical position with the female screw hole 20a as the center. Are provided integrally. A fixing member 26 is formed by the screwing portion 20, the long plate 22, and the hanging bracket 24.

  The lower end portion of the shaft 18 is slidably fitted in a spring accommodating portion 28 formed in a cylindrical shape from a metal such as stainless steel. A coil spring 30 is housed in the spring accommodating portion 28 so as to be compressible, and a lower end portion of the shaft 18 is in contact with an upper end of the coil spring 30. The lower end of the coil spring 30 is in contact with the bottom of the spring accommodating portion 28.

  The spring accommodating portion 28 is positioned at the center of a pressing plate 32 formed in a circular shape by a metal plate such as stainless steel, and is fixed to the pressing plate 32 with a screw or the like via a glasses plate 34. The pressing plate 32 may be a stainless steel net, a punching metal, or a resin molded product formed integrally with the spring accommodating portion 28.

  The flange portion 14 is formed in a cylindrical shape having an open end, and has an inner diameter slightly larger than the outer diameter of the pressing plate 32. The other end surface is formed in a slightly raised shape from the side end portion. In addition, a pair of receiving brackets 36 are provided on the outer periphery in the vicinity of the opened end surface so as to be detachable from the hanging bracket 24, symmetrically with respect to the center of the end surface. The receiving metal 36 is locked so that the screwing portion 20 of the fixing member 26 cannot move in a state where the hanging metal 24 is engaged. Further, the skeleton of the collar portion 14 is formed of a metal rod such as stainless steel, and the metal is formed on the side surface and the bottom surface so that moisture can flow out, for example, a mesh with a wire diameter of 2 mm and a spacing of 4 mm. A net 38 is provided.

A filtration bag 44 is provided inside the collar portion 14. The filtration bag 44 is provided by sewing felt into a bag shape through which moisture can pass. The felt used for the filtration bag 44 has, for example, a basis weight of 200 g / m ³ and a thickness of 5 mm. If a recycled felt is used, the felt becomes environmentally friendly. A drainage container for receiving primary filtered water described later is provided below the flange part 14.

  Next, the wax peeling sewage treatment method will be described. First, old wax is dissolved with a release agent and a cleaning agent from the floor to be waxed, and the wastewater 40 in which the old wax on the floor is dissolved is absorbed by a mop or the like and collected in the wastewater container 42. The activated carbon powder is put into the collected sewage 40 of the sewage container 42, and the activated carbon powder is mixed relatively strongly so that zinc, nitrogen, phosphorus, etc. are sufficiently adsorbed, and the activated carbon is adsorbed with dissolved substances. . The particle diameter of the activated carbon powder is, for example, 1 micrometer to 110 micrometers.

  Next, a flocculant that hardens the old wax is added. When the sewage is alkaline, the flocculant is an agent containing aluminum oxide, sulfur or the like, for example, trade name No. When 6-C (manufactured by Uchida Water Treatment Research Institute) is used and sewage is neutral, chemicals containing silicon dioxide, aluminum oxide, calcium carbonate, etc., for example, trade name Gaia Flock α (Shimizu Laboratory, Ltd.) Use). The addition amount of the flocculant is 3% with respect to the sewage 40, for example. In the case of Gaia Flock α, it is 2.5%. When the agglomerated material is added, the mixture is stirred, and if it becomes a viscous liquid, it is in a neutralized state, and the stirring is terminated. The time required for neutralization is 1 to 2 minutes. Thereto, about 4 to 5 times as much water is added, and the mixture is sufficiently stirred until the wax component and the like are sufficiently adsorbed to the activated carbon powder, and allowed to stand for about 5 minutes. Then, the old wax component is aggregated by the flocculant and separated from the water, and an aggregate is generated. Subsequent vigorous stirring produces large agglomerates.

  Next, the sewage 40 containing the aggregate is put into a filtration bag 44 set in the dehydrator 10. In the sewage 40 introduced into the filtration bag 44, moisture permeates the filtration bag 44 to become primary filtered water and flows out from the ridge 14 and accumulates in a drainage container (not shown). Aggregates remain inside the filter bag 44. And the opening edge part of the filtration bag 44 is folded in the state which wraps up the aggregate. Thereafter, the pressing plate 32 is inserted into the flange portion 14, the position of the pressing plate 32 is adjusted to be close to the screwing portion 20, the position is adjusted, and the bracket 24 of the fixing member 26 is received by the receiving portion provided on the flange portion 14. The fittings 36 are respectively fitted. As a result, the fixing member 26 cannot move in the axial direction of the shaft 18.

  Then, the handle 16 is turned to rotate the shaft 18 in the tightening direction with respect to the screwing portion 20 of the fixing member 26. Then, the agglomerate of the collar portion 14 is pressed by the pressing plate 32, the moisture of the agglomerate is pushed out, passes through the filtration bag 44, and is further discharged. At this time, the volume of the aggregate decreases and the pressing force of the pressing plate 32 decreases, but the elastic biased state is maintained by the pressed coil spring 30 at the end of the shaft 18 to compensate for the decreasing pressing force. . After the aggregates are sufficiently dehydrated, the handle 16 of the compressor 12 is rotated to release the pressing plate 32 from the filtration bag 44 enclosing the aggregates, and the hooks 24 are removed from the receiving brackets 36. 12 is removed from the heel part 14. Then, the agglomerates wrapped in the filtration bag 44 are taken out and discarded as industrial waste. Note that the aggregate may be dried to reduce the weight.

  The primary filtered water collected in the drainage vessel is light amber. Next, activated carbon is put inside a new filter bag 44, primary filtered water is put therein, and the activated carbon is filtered. The one obtained by filtering with activated carbon becomes colorless and transparent secondary filtered water. The secondary filtered water satisfies the sewage exclusion standard and is drained to the sewage outlet. The activated carbon used to turn the primary filtrate into secondary filtrate can be recycled and can be reused several times.

  This wax peeling sewage treatment method can be performed in a required time of 15 minutes to 20 minutes. When the amount of the sewage 40 is set to 5 l as a guide, it becomes easy to work. If there is space for dehydration work, it can be processed locally. If the dehydrating work space is only wash ware, it is recommended to use an oil collecting mat for curing. In the case of waxing, the cleaning work is the main and the peeling work is less frequent.

  According to the wax peeling sewage treatment method of this embodiment, a relatively clean secondary filtered water is taken out from the sewage 40 containing wax and drained into sewage in a simple process, so that solids can be easily discarded. can do. Since only the agglomerates containing wax are discarded as industrial waste, the processing amount of industrial waste can be greatly reduced, and the processing amount is reduced to, for example, about 1/10 of the normal amount. . As a result, it is sufficient to bring back only the agglomerates, and the amount of industrial waste is greatly reduced. In addition, industrial waste costs can be reduced. Filtration can be performed smoothly in a short time by aggregating the wax resin which is the main component of the sewage 40 and using the dehydrator 10.

  The secondary filtered water satisfies the sewage drainage standard, and can be drained into sewage and gutters at the wax treatment work site. When the wax component is agglomerated, fine suspended matters are adhered to the agglomerate, so that it does not permeate the filtration bag 44 during filtration, and the normal hexane and zinc-containing substances in the oil can be removed. Although the pH of the sewage 40 varies depending on whether it is a peeling operation or a recoating operation, it can be efficiently aggregated and made harmless by using a coagulant suitable for each. Moreover, the alkali concentration of the sewage 40 can be neutralized and can be made harmless from this point.

  Since the dewatering of the sewage 40 is performed by the dehydrator 10 and the pressure can be continuously applied, it is possible to engage in other work and the work efficiency is improved. The filtration bag 44 can be disposable and is hygienic, but has a strength that can be reused several times, so it can be used any number of times when there are few aggregates, and is economical. . The dehydrator 10 fits into a commercially available pail can, is compact and lightweight, and is easy to carry. Also, the space can be used effectively without taking up the operator's space.

  In addition, when the concentration of the sewage 40 is extremely high or when the secondary filtrate is surely cleaned, the primary filtrate discharged by the dehydration treatment is shown in FIG. 2 in order to clean it more reliably. Processing may be performed. In this method, granular activated carbon and activated carbon powder are put into primary filtered water discharged into a drainage container by dehydration, and the mixture is stirred for 5 to 10 minutes and dispersed in primary filtered water. The particle diameter of the granular activated carbon is, for example, 1 mm to 5 mm, and the particle diameter of the activated carbon powder is 1 micrometer to 110 micrometers that is the same as that to be put in the first step of the sewage 40. As a result, the remaining lysate is adsorbed. Next, about 0.2% of a flocculant (neutral) is added and stirred. As a result, the remaining dissolved matter is aggregated by the aggregating agent, separated from moisture, and aggregated. This is put into the filtration bag 44 set in the dehydrator 10 again. Aggregates dehydrated by the dehydrator 10 and remaining in the filter bag 44 are discarded as industrial waste. The secondary filtered water that has passed through the overbag 44 is drained into the sewer.

  The secondary filtered water treatment method shown in FIG. 2 is effective for sewage containing a large amount of a surfactant (cleaning agent). Further, it is effective when a strong release agent is used for wax peeling or when a wax having a high wax resin content is peeled off. And the situation where BOD (biochemical oxygen demand) of primary filtered water is high can be solved.

  In order to confirm the treatment capability of the wax-exfoliated sewage treatment method of the present invention, each item in Table 1 below was measured for the sewage before treatment and the secondary filtrate after treatment.

  As a result, sewage is reduced by 90% or more in the secondary filtered water for each item, almost satisfies the drainage standard, and can be drained into the sewer.

It is the schematic which shows the process of the wax peeling wastewater treatment method of one Embodiment of this invention. It is the schematic which shows the modification of the wax peeling wastewater treatment method of this embodiment. It is a disassembled perspective view which shows the dehydrator used for the wax peeling wastewater treatment method of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dehydrator 12 Compressor 14 Gutter part 16 Handle 18 Shaft 32 Press plate 40 Sewage 42 Sewage container

Claims (3)

  Add activated carbon powder to the sewage containing the exfoliated wax and mix it together. Add a flocculant to it, add water and stir well. The sewage produced by the agglomerate is dehydrated by a dehydrator, separated into primary filtered water and the agglomerated material, and the agglomerated material is discarded as industrial waste, and the primary filtered water Is a wax stripping sewage treatment method characterized in that after being filtered with activated carbon to give secondary filtrate, it is drained into the sewer.   The wax removal according to claim 1, wherein the primary filtered water obtained by the dehydration treatment is filtered by activated carbon by charging the primary filtered water into a filtration bag containing activated carbon. Wastewater treatment method. The primary filtered water obtained by the dehydration treatment is filtered using activated carbon. Activated carbon powder and granular activated carbon are added to the primary filtered water and stirred, and then a flocculant is added and stirred to form aggregates. The method according to claim 1, wherein the primary filtered water produced by the aggregate is put into a filtration bag and filtered.

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