JP2014223563A - Piping for wastewater treatment, and production and regeneration method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping having a simple structure for wastewater treatment, capable of effectively removing objective removal materials such as heavy metals, radioactive materials, and suspended materials contained in wastewater, allowing removing members after removal of objective removal materials to be easily replaced, so that reduction in production costs and reduction in the volume of waste substance can be achieved.SOLUTION: The piping for wastewater treatment for removing objective removal materials from wastewater flowing down in a pipeline (piping members 10 successively connected) includes an inorganic material in a porous form (e.g. a geopolymer composition having ion exchange performance) 20 disposed on the inner surface of pipeline (piping member 10). The inorganic material 20 has a cylindrical shape along the inner surface of the pipeline (piping member 10).

Description

  The present invention relates to a wastewater treatment pipe, a method for producing the same, and a regeneration method. For example, an inorganic substance having a porous shape is arranged on the inner surface of a pipe made of a steel pipe, an FRP pipe, etc. The present invention relates to a wastewater treatment pipe capable of removing heavy metals, radioactive substances and suspensions contained therein, a method for producing the same, and a method for regenerating the same.

  Conventionally, for example, the following methods are known as methods for removing heavy metals, radioactive substances, and suspensions contained in waste water.

  The first method is a method in which microorganisms are fixed to a filter medium, and a contaminated component is treated using the microorganisms adhered and fixed to the filter medium (activated sludge method (contact oxidation method)). The second method is a method in which fine suspended substances and soluble pollutants are aggregated by adding chemicals (aggregating agent) and the aggregates are removed by precipitation (aggregating precipitation method). The third method is a method of adsorbing and removing soluble low-concentration organic substances in the wastewater using the surface of fine voids possessed by activated carbon (activated carbon adsorption method). The fourth method is a method of obtaining clarified water by retaining suspended substances in the filtration layer by osmotic flow of drainage into the filtration layer such as sand (filtration method).

  For example, as a flocculant precipitation method, a wastewater treatment system that controls the amount of addition according to fluctuations in the heavy metal ion content in the treated raw water and a wastewater treatment method using the wastewater treatment system have been proposed (see Patent Document 1). The technique described in Patent Document 1 includes a raw water flow meter for measuring the flow rate of treated raw water, a primary reaction tank for treating the treated raw water by adding an inorganic flocculant and a neutralizing agent, and oxidizing the resulting slurry. Polymer coagulant is added to the oxidation tank to be treated by adding the agent, the secondary reaction tank to react by adding the neutralizing agent to the oxidized raw water, and the coagulation tank to which the neutralized slurry is introduced And a plant settling tank for precipitating the starch in the slurry, and a plant monitoring controller (DCS) for calculating the amount of polymer flocculant added. Based on the relationship between the amount of neutralizing agent used and the amount of starch generated, the plant monitoring controller (DCS) calculates the amount of polymer flocculant added using the raw water flow rate and neutralizing agent addition rate data. , And is transmitted to the addition amount adjusting device.

  In addition, as a method for assisting the activated sludge method and the coagulation sedimentation method, the microbe bubbles and nanobubbles can be activated by microorganisms, and the water generated by the oxidation of organic substances and pollutants by the oxidation action caused by free radicals of micronanobubbles and nanobubbles. A technique using nanobubbles has been proposed (see Patent Document 2). The technique described in Patent Document 2 is based on the concentration of organic fluorine compounds in the water to be treated detected by the inflow water bubble level sensing unit based on the height of the bubbles generated on the surface of the water to be treated. From the inside, the number of nanobubble generators to be operated is controlled.

  In addition, as a coagulation sedimentation method, a wastewater treatment apparatus capable of dealing with various harmful components has been proposed (see Patent Document 3). The technique described in Patent Document 3 is at least one selected from oxides of iron, aluminum, silicon, titanium, zirconium, cobalt, potassium, and magnesium, and oxides of molybdenum, manganese, nickel, copper, zinc, and cadmium. A first ceramic particle made of porous ceramic containing selenium and a second ceramic particle made of porous ceramic containing hydroxyapatite are placed on a porous ceramic plate and covered with a rust preventive film underneath. This is a technology that constitutes a wastewater treatment device in which permanent magnets are arranged and adds chlorine or hypochlorite to the wastewater to be treated. In this method, organic substances are decomposed by the catalytic action of the first ceramic particles, and heavy metal ions can be removed from the waste water by the second ceramic particles.

JP 2010-94647 A JP 2009-255011 A JP 2009-166018 A

  All of the conventional techniques described above are aimed at removing harmful substances and purifying wastewater to a certain standard. However, for example, in the coagulation sedimentation method, the coagulation effect is affected by the type and concentration of pollutants in the wastewater, the type and concentration of coexisting components, the pH and temperature of the wastewater.

  Therefore, it is necessary to confirm in advance the type and amount of the flocculant, the optimum pH, the stirring conditions, etc., and labor is required for operation. Furthermore, when the versatility is enhanced (when a wide range of target substances are set), the processing apparatus and the procedure become complicated, resulting in a result that requires a large amount of equipment and maintenance. Furthermore, when installing the treatment facility, the treatment facility is often provided at an arbitrary place, and it is necessary to provide a raw water intake channel and a treated water drainage channel leading to the treatment facility.

  Moreover, in recent years, there are wastewater containing radioactive materials of a very low level or non-radioactive waste (NR (Non Radioactive Waste)) as a substance to be removed, mainly for agricultural workers who use river water etc. There is a demand for securing simple, inexpensive and safe water. Such a problem applies not only to the coagulation sedimentation method but also to other removal target substance removal techniques.

  The present invention has been proposed in view of the above-described circumstances, and it is possible to effectively remove substances to be removed such as heavy metals, radioactive substances, and suspended solids contained in wastewater while having a simple structure. In particular, by using a porous inorganic substance (especially an inorganic substance having ion exchange performance), a synergistic effect that combines the effects of the adsorption method, ion exchange performance, and filtration method when removing the substance to be removed is provided. An object of the present invention is to provide a wastewater treatment pipe that can be achieved. In addition, the present invention provides a manufacturing method and a regeneration method of a wastewater treatment pipe capable of reducing the manufacturing cost by making it possible to easily replace the removal material after removing the substance to be removed and reducing the volume of waste. The purpose is to provide.

  The drainage treatment pipe, its manufacturing method, and regeneration method of the present invention have been proposed to solve the above-described problems and have the following features. That is, the wastewater treatment pipe of the present invention is a wastewater treatment pipe for removing a substance to be removed from the wastewater flowing down the pipe, and an inorganic substance having a porous shape is disposed on the inner surface of the pipe It is characterized by that. Here, the inorganic substance is preferably cylindrical along the inner surface of the pipe, and more preferably ion exchange performance is imparted.

  In addition, the method for manufacturing a wastewater treatment pipe according to the present invention is a method for producing a wastewater treatment pipe for removing a substance to be removed from wastewater flowing down in a pipeline, and the inside of the pipeline has fluidity. A step of introducing an inorganic material having a porous shape after curing, a step of inserting a penetration jig having continuous spiral blades into the inorganic material introduced into the pipe, and a penetration jig. A step of rotating and extending an inorganic substance material on the inner surface of the pipe line by a spiral wing to dispose an inorganic substance having a concavo-convex shape on the inner peripheral surface and exhibiting a porous shape. To do.

  Further, the method for regenerating a wastewater treatment pipe according to the present invention is a method for regenerating a wastewater treatment pipe for removing a substance to be removed from wastewater flowing down in a pipe, wherein the inner surface of the pipe has a porous shape. A step of disposing an inorganic substance to be exhibited; a step of removing a inorganic substance exhibiting a porous shape disposed on the inner surface of the pipe line after draining water into the pipe line and removing the substance to be removed by the inorganic substance; And a step of newly disposing an inorganic substance having a porous shape on the inner surface of the pipe.

  Further, the method for regenerating a wastewater treatment pipe according to the present invention is a method for regenerating a wastewater treatment pipe for removing a substance to be removed from wastewater flowing down in a pipe, wherein the inner surface of the pipe has a porous shape. The process of disposing the inorganic substance to be exhibited, and after removing the material to be removed by flowing down the drainage into the pipe, washing, acid treatment, etc. on the inorganic substance exhibiting a porous shape disposed on the inner surface of the pipe And a step of recovering the removal performance of the substance to be removed by performing a regeneration process.

  According to the wastewater treatment pipe and the regeneration method of the present invention, an inorganic substance (in particular, an inorganic substance having an ion exchange performance (for example, a geopolymer composition) on the inner wall of a pipe line (steel pipe, FRP pipe, etc.) It is possible to easily construct an arbitrary drainage path (flowing path) by arranging the pipes and the like and connecting the pipes in communication.

Also, in the process of draining the drainage water in the pipeline, the heavy metal substance (Pb ²⁺ ) contained in the wastewater comes into contact with the inorganic material having a porous shape (particularly, an inorganic material having ion exchange performance) and the wastewater. Each of the ions adhering (adsorbing) to the radioactive substance (Cs ⁺ ) or suspension (SS) can be removed. As described above, since an inorganic substance having a porous shape (in particular, an inorganic substance having ion exchange performance) is used, the effects of the adsorption method, ion exchange performance, and filtration method are combined when removing the target substance to be removed. There can be a synergistic effect.

  In addition, by adopting a manufacturing method in which an inorganic substance is disposed in a pipe using an intrusion jig having continuous spiral blades, a drainage treatment pipe having an irregular shape formed on the inner peripheral surface of the inorganic substance is provided. It can be manufactured easily. Furthermore, since the irregular shape is formed on the inner peripheral surface of the inorganic substance, the contact area between the waste water flowing down the waste water treatment pipe and the inorganic substance increases, and the removal performance of the removal target substance can be improved.

  In addition, by removing only inorganic substances (especially ion exchangers installed on the inner wall of the pipeline) to which harmful substances are attached (adsorbed), it is possible to reduce the waste generated from the maintenance of the pipeline. it can. Further, by purifying and reusing the ion exchanger by acid treatment or the like, generation of further waste can be suppressed. In addition, manufacturing cost can be reduced significantly by recycling the pipe line after removing an inorganic substance (especially inorganic substance which has ion exchange performance), and installing an ion exchanger again.

The perspective view which shows the piping for waste water treatment which concerns on embodiment of this invention. The perspective view which shows the manufacturing method (1) of the wastewater treatment piping which concerns on embodiment of this invention. The perspective view which shows the manufacturing method (2) of the piping for waste water treatment which concerns on embodiment of this invention. The cross-sectional view which shows the cross-sectional shape of the piping for waste water treatment which concerns on embodiment of this invention. Explanatory drawing which shows the method of extracting an inorganic substance from the piping for waste water treatment which concerns on embodiment of this invention.

  Hereinafter, embodiments of a wastewater treatment pipe, a manufacturing method thereof, and a regeneration method according to the present invention will be described with reference to the drawings. 1 to 5 illustrate a wastewater treatment pipe and a regeneration method thereof according to an embodiment of the present invention, FIG. 1 is a perspective view showing the wastewater treatment pipe, and FIGS. 2 and 3 are views of the wastewater treatment pipe. FIG. 4 is a perspective view showing a manufacturing method, FIG. 4 is a transverse cross-sectional view showing a cross-sectional shape of a wastewater treatment pipe, and FIG. 5 is an explanatory view showing a method for extracting an inorganic substance from the wastewater treatment pipe.

<Outline of wastewater treatment piping>
The drainage treatment pipe according to the embodiment of the present invention is used, for example, when river water is used as agricultural water, and is intended for removal of heavy metals, radioactive substances, suspensions, etc. contained in river water (drainage). Can be used to remove material. Specifically, by disposing a porous inorganic substance (especially an inorganic substance having ion exchange performance) on the inner surface of the pipe line that becomes the drainage path, When removing substances to be removed such as heavy metals, radioactive substances and suspensions contained therein, a synergistic effect combining the effects of the adsorption method, ion exchange performance and filtration method can be achieved. In addition, in the following description, the tubular member which comprises a series of pipe lines by connecting using a pipe joint (joint) is called a piping member, and is demonstrated.

<Specific configuration of wastewater treatment piping>
As shown in FIG. 1, a wastewater treatment pipe according to an embodiment of the present invention has a porous inorganic material 20 (in particular, an inorganic substance having ion exchange performance) on the inner surface of a pipe member 10 made of a steel pipe, an FRP pipe, or the like. The substance 20) is formed in a cylindrical shape. The steel pipe, the FRP pipe, and the like are straight tubular piping members 10 and have a length of about 3 m, for example. In addition, the internal diameter and length of the piping member 10 can be changed and implemented suitably according to the environment where the wastewater treatment piping is installed, the flow rate of the wastewater, and the like.

  As will be described in detail later, in order to easily dispose the inorganic substance 20 having a porous shape on the inner surface of the piping member 10, the piping member 10 is preferably a straight tube, and a plurality of piping members 10 are connected to a pipe joint (see FIG. (Not shown), a pipe having a desired length can be formed. Further, in a place where bending is required, the pipe line can be bent by connecting the straight tubular piping member 10 and the piping member 10 having a desired curvature by a pipe joint (joint).

<Geopolymer composition>
In the embodiment of the present invention, the inorganic substance 20 having ion exchange performance disposed in the piping member (pipe) 10 is preferably a geopolymer composition. Hereinafter, a geopolymer composition will be described as an example of the inorganic substance 20 disposed in the piping member (pipe line) 10. This geopolymer composition is, for example, a composition obtained by using an active filler, an alkali activator, and an aggregate as raw materials. The cured product is activated by activating the active filler with an alkali activator solution and polymerizing and solidifying it. Make it. That is, when a metal such as aluminum eluted from the active filler comes into contact with water containing a water glass component, the silicic acid complex (SiO ₄ ) is crosslinked and polymerized to obtain a cured product.

<Active filler>
The active filler used in the embodiment of the present invention is at least one of fly ash, blast furnace slag, sewage incineration sludge, and kaolin. Among these active fillers, fly ash, blast furnace slag, and sewage incineration sludge are industrial byproducts containing glass components, and the environmental burden can be reduced by reusing them.

Fly ash is coal ash discharged as a combustion by-product in a coal-fired power plant, and is mainly composed of silica (SiO ₂ ) and alumina (Al ₂ O ₃ ). Blast furnace slag is an industrial by-product generated in the pig iron manufacturing process, and contains lime (CaO) and silica (SiO ₂ ) as main components and contains alumina (Al ₂ O ₃ ) and magnesia (MgO). Sewage incineration sludge is obtained by incinerating sludge generated in sewage treatment, and contains silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) as main components and contains phosphoric acid (P ₂ O ₅ ). Kaolin (Al ₂ Si ₂ O ₅ (OH) ₄ ) is a kind of naturally occurring silicate mineral.

<Alkali activator>
Examples of the alkali activator include water glass (sodium silicate solution or potassium silicate solution), potassium hydroxide (KOH) solution, sodium hydroxide (NaOH) solution, sodium metasilicate powder, and the like.

<Aggregate>
As the aggregate, those used for general concrete and mortar can be used.

<Manufacturing method of drainage treatment pipe (1)>
Hereinafter, the manufacturing method of the wastewater treatment piping of the present invention will be described. As shown in FIG. 2, the first method for producing the wastewater treatment pipe of the present invention is to introduce an inorganic substance material (geopolymer composition (inorganic substance 20)) having fluidity into the pipe member 10. Then, the geopolymer composition (inorganic substance 20) is disposed on the inner surface of the piping member 10 using the penetration jig 50. As shown in FIG. 2, the penetration jig 50 includes a shaft portion 52 extending from the operation portion 51 and a spiral blade 53 provided on the outer peripheral surface of the shaft portion 52. The outer diameters of the shaft portion 52 and the spiral blade 53 can be appropriately set according to the inner diameter of the geopolymer composition (inorganic substance 20) disposed on the inner surface of the piping member 10. Moreover, it is preferable to make the front-end | tip part of the penetration jig | tool 50 into a taper-shaped taper screw shape so that the penetration jig | tool 50 can be easily inserted in a geopolymer composition (inorganic substance 20).

  Specifically, as shown in FIG. 2, first, an appropriate amount of a geopolymer composition (inorganic substance 20) is first introduced into the piping member 10 (a). This geopolymer composition (inorganic substance 20) has a fluidity before curing. The input amount of the geopolymer composition (inorganic substance 20) is set to an amount necessary and sufficient to form the cylindrical geopolymer composition (inorganic substance 20) on the inner surface of the piping member 10.

  Subsequently, before the geopolymer composition (inorganic substance 20) charged into the piping member 10 is cured, the penetration jig 50 is inserted into the geopolymer composition (inorganic substance 20) (b). And the geopolymer composition (inorganic substance 20) is extended to the inner surface of the piping member 10 by the spiral blade 53 by operating the operation part 51 and rotating the penetration jig 50 (c). When the geopolymer composition (inorganic substance 20) is cured, the concave and convex portions 22 are provided on the inner peripheral surface along the inner surface of the piping member 10, and an inorganic substance having a porous shape can be disposed (d). In the first manufacturing method, the support direction of the piping member 10 may be substantially vertical or substantially horizontal.

<Manufacturing method of drainage treatment pipe (2)>
As shown in FIG. 3, the second method of manufacturing the wastewater treatment pipe of the present invention supports a pipe member 10 such as a steel pipe or an FRP pipe in a substantially vertical shape, and has a columnar or cylindrical shape inside the pipe member 10. This is a method in which a shaped mold 30 is inserted, and the gap between the inner surface of the piping member 10 and the outer surface of the mold 30 is filled with a geopolymer composition (inorganic substance 20). Then, after the geopolymer composition (inorganic substance 20) is cured, the geopolymer composition (inorganic substance 20) is disposed on the inner surface of the piping member 10 by removing the mold 30 from the inside of the piping member 10. Can do. Under the present circumstances, the layer of the geopolymer composition (inorganic substance 20) of desired thickness can be formed in the inner surface of the piping member 10 by setting the outer diameter of the formwork 30 member suitably. Further, when the mold member 30 is installed inside the pipe member 10, the mold member 30 can be installed at substantially the center of the pipe member 10 by using a positioning member, a spacer, or the like.

  Moreover, although not shown in figure, you may provide the convex part (projection) which continues in a longitudinal direction with respect to the outer surface of the formwork 30. FIG. The shape of the protrusion (projection) may be any shape, but may be, for example, a cross-sectional triangle, a cross-sectional quadrangle, a cross-sectional semicircle, or the like. In this way, by forming convex portions (projections) on the outer surface of the mold 30, as shown in FIG. 4, the geopolymer composition (inorganic substance 20) is not only made cylindrical (a), but also geo The inner surface of the polymer composition (inorganic substance 20) can be formed with recesses 21 such as a triangular cross section (b), a quadrangular cross section (c), and a semicircular cross section (d). Thereby, the contact area of the waste_water | drain which flows down the piping for waste_water | drain processing, and a geopolymer composition (inorganic substance 20) can be increased. Moreover, a convex part can be formed in the inner surface of a geopolymer composition (inorganic substance 20) by providing the continuous recessed part in the outer surface of the formwork 30. FIG.

<Recycling method for wastewater treatment piping>
If the wastewater is caused to flow down through the wastewater treatment pipe for a predetermined period, the removal target substance is accumulated in the geopolymer composition (inorganic substance 20) by filtration, adsorption, etc., and the removal performance of the removal target substance is lowered. Therefore, it is preferable that after a predetermined period elapses, the geopolymer composition (inorganic substance 20) in the wastewater treatment pipe is extracted and a new geopolymer composition (inorganic substance 20) is provided. Thereby, while being able to remove a substance to be removed effectively, it is possible to reduce the waste generated due to the maintenance of the pipeline.

  In order to remove the existing geopolymer composition (inorganic substance 20) from the pipe member 10, after removing the pipe member 10 connected by a pipe joint (not shown), as shown in FIG. The extraction member 40 may be inserted into the piping member 10 while being supported in a substantially vertical shape. Note that the geopolymer composition (inorganic substance 20) may be removed by supporting the piping member 10 substantially horizontally. In this case, when a new geopolymer composition (inorganic substance 20) is disposed inside the piping member 10 using a mold, the piping member 10 is saved in order to save labor for changing the installation position of the piping member 10. Is preferably supported substantially vertically.

  Although the geopolymer composition extraction device is not shown, an apparatus having the same configuration as a sample extraction device for extracting a sample from the thin wall tube can be used. For example, by pushing the extraction member 40 having an inner diameter that can be inserted into the piping member 10 into the piping member 10, the lower geopolymer composition (inorganic substance 20) is extracted inside the piping member 10. Can do. As a driving device for the extraction member 40, any device such as a hydraulic jack, an electric jack, an air jack or the like may be used.

<Acid treatment of inorganic substances>
In addition, after a predetermined period of time has passed, the geopolymer composition (inorganic substance 20) in the wastewater treatment pipe is subjected to regeneration treatment such as washing and acid treatment, and adhered to the geopolymer composition (inorganic substance 20) ( The removal target substance that has been adsorbed) may be removed to recover the removal performance of the removal target substance.

  The replacement period and acid treatment of the geopolymer composition (inorganic substance 20) depend on the environment in which the wastewater treatment pipe is installed, the type and concentration of substances to be removed such as heavy metals, radioactive substances and suspensions contained in the wastewater. Accordingly, it can be implemented with appropriate changes.

DESCRIPTION OF SYMBOLS 10 Piping member 20 Inorganic substance 21 Concavity 22 Concavity and convexity 30 Formwork 40 Extraction member 50 Penetration jig 51 Operation part 52 Shaft part 53 Spiral blade

Claims (6)

A wastewater treatment pipe for removing a substance to be removed from wastewater flowing down in a pipeline,
A drainage treatment pipe, wherein an inorganic substance having a porous shape is disposed on an inner surface of the pipe line.   The wastewater treatment pipe according to claim 1, wherein the inorganic substance has a cylindrical shape along the inner surface of the pipe line.   The drainage treatment pipe according to claim 1 or 2, wherein the inorganic substance is imparted with ion exchange performance. A method for producing a wastewater treatment pipe for removing a substance to be removed from wastewater flowing down in a pipeline,
Injecting an inorganic substance material having fluidity and exhibiting a porous shape after curing into the inside of the pipe line;
A step of inserting a penetration jig having a continuous spiral blade into the inorganic material introduced into the pipe;
A step of disposing an inorganic substance having an irregular shape on the inner peripheral surface and exhibiting a porous shape by rotating the penetration jig and extending the inorganic substance material to the inner surface of the pipe line by the spiral blade. When,
The manufacturing method of the piping for waste water treatment characterized by including. A method for regenerating a wastewater treatment pipe for removing a substance to be removed from wastewater flowing down in a pipeline,
Disposing an inorganic substance having a porous shape on the inner surface of the conduit;
Removing the inorganic substance exhibiting a porous shape disposed on the inner surface of the pipe line after removing the substance to be removed by the inorganic substance by flowing down drainage into the pipe line;
A step of disposing a new porous inorganic substance on the inner surface of the pipe;
A method for reclaiming wastewater treatment piping, comprising: A method for regenerating a wastewater treatment pipe for removing a substance to be removed from wastewater flowing down in a pipeline,
Disposing an inorganic substance having a porous shape on the inner surface of the conduit;
After removing the material to be removed by flowing down the waste water into the pipeline, the inorganic material having a porous shape disposed on the inner surface of the pipeline is subjected to a regeneration treatment such as washing, acid treatment, etc. Recovering the removal performance of the substance to be removed;
A method for reclaiming wastewater treatment piping, comprising:

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