Purification apparatus and its lid member

Abstract

To prevent as much as possible the leakage of foul odors from the internal space of the purification treatment device. [Solution] The wastewater treatment apparatus 1 comprises a treatment tank body 3 that performs a predetermined treatment on wastewater, a manhole 4 provided on the upper surface of the treatment tank body 3, and a lid member 7 that is attached to the manhole 4. The lid member 7 has a containment section 19 on its upper side for containing soil, and the containment section 19 has a ventilation section 19a that connects the inside of the treatment tank body 3 and the inside of the containment section 19. The containment section 19 has a recess in which soil is contained, and soil deodorization is performed by microorganisms in the soil.

Description

Technical Field

[0001] The present invention relates to a purification treatment apparatus, and particularly relates to a structure of a lid member attached to a manhole of the purification treatment apparatus.

Background Art

[0002] Conventionally, as a wastewater treatment facility mainly in regions where wastewater treatment infrastructure is not sufficiently developed, a purification treatment apparatus that purifies wastewater discharged from toilets, kitchens, bathrooms, washrooms, washing machines and the like and discharges the purified wastewater is known.

[0003] Among treatment tanks provided in a purification treatment apparatus, there are known and actually applied biological treatment tanks that decompose organic substances in wastewater by utilizing the metabolic reaction of microorganisms, chemical treatment tanks that remove unnecessary substances from wastewater by utilizing chemical reactions such as oxidation, reduction, neutralization, aggregation and adsorption, and physical treatment tanks that separate and remove specific substances from wastewater by filtration, precipitation and the like.

[0004] For example, Patent Document 1 discloses a purification treatment apparatus including, among the above-mentioned biological treatment tanks, an anaerobic tank utilizing anaerobic metabolism that does not require oxygen supply, a filtration tank serving as a physical treatment tank, and a disinfection tank performing chlorine-based disinfection serving as a chemical treatment tank.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0006] Incidentally, this type of purification treatment apparatus is generally provided with a manhole for workers to enter and exit the interior of the purification treatment apparatus for the purposes of inspection, maintenance, cleaning and the like of each tank. A lid is attached to the manhole for the purpose of preventing the inflow of rainwater, earth and sand and the like from the outside (see Patent Document 1).

[0007] The primary purpose of wastewater treatment systems is to remove organic matter from wastewater before discharge. Therefore, even if some of the odor-causing organic matter is removed during the treatment process, the internal space of the treatment system tends to retain odors. Due to the nature of manholes, which open and close, and the need to ensure a certain degree of ventilation, it is difficult to completely seal them even when the manhole is covered. This leads to a problem where odor-containing gases accumulated inside the treatment system leak out. In particular, wastewater treatment systems equipped with biological treatment tanks utilizing anaerobic microorganisms are even more prone to odor leakage.

[0008] In view of the above circumstances, the present invention aims to solve the technical problem of preventing the leakage of malodorous odors from the internal space of a purification treatment device as much as possible. [Means for solving the problem]

[0009] The above problems are solved by the purification apparatus according to the present invention. Specifically, this purification apparatus comprises a treatment tank body that performs a predetermined purification treatment on wastewater, a manhole provided on the upper surface of the treatment tank body, and a lid member that is attached to the manhole, wherein the lid member has a containment portion on its upper side for containing soil, and the containment portion has a ventilation portion that connects the inside of the treatment tank body and the inside of the containment portion.

[0010] As described above, in the purification treatment apparatus according to the present invention, the lid member attached to the manhole has a containment section on its upper side for containing soil, and the containment section has a ventilation section that connects the inside of the treatment tank body and the inside of the containment section. As a result, organic substances that cause malodors contained in the gas in the internal space of the treatment tank body are decomposed by microorganisms contained in the soil. Therefore, without installing special deodorizing equipment, it is possible to eliminate or reduce malodors in the internal space of the treatment tank body and prevent or significantly reduce the leakage of malodors as much as possible. Furthermore, due to its characteristics, the gas present in the internal space of the purification treatment apparatus is always in a state where it contains a lot of moisture. As a result, a constant supply of abundant moisture is provided to the microorganisms contained in the soil, making it possible to continuously exert a stable deodorizing effect.

[0011] Furthermore, because the soil containment section has a ventilation section, a large amount of moisture-containing gas is supplied to the soil from the internal space of the purification treatment device through the ventilation section. As a result, moisture can be continuously supplied to the microorganisms in the soil, making it possible to continuously exert a stable deodorizing effect.

[0012] Furthermore, in the purification apparatus according to the present invention, plants may be planted in the soil.

[0013] This configuration allows plant roots to spread throughout the soil. As a result, the soil can be firmly held in place by these spreading roots. Consequently, the soil is stably protected from wind and rain, which allows for a stable and continuous deodorizing effect. In addition, the presence of plants prevents situations such as people accidentally stepping through the soil in the lid. Therefore, the soil can be retained for a long period of time. [Effects of the Invention]

[0014] As described above, the purification apparatus according to the present invention makes it possible to prevent as much as possible the leakage of malodorous odors from the internal space of the purification apparatus. Furthermore, since the leakage of malodorous odors can be prevented simply by replacing existing manhole covers with the cover member of the present invention and filling the storage portion of the cover member with soil, it is possible to implement odor control measures at a low cost. [Brief explanation of the drawing]

[0015] [Figure 1] This is a partially cutaway front view showing the overall configuration of a purification treatment device according to one embodiment of the present invention. [Figure 2] Figure 1 is a cross-sectional view of the lid member and its surrounding area. [Figure 3] Figure 2 is a plan view of the lid member shown. [Modes for carrying out the invention]

[0016] The contents of the purification treatment device according to one embodiment of the present invention will be described below based on the drawings.

[0017] Figure 1 shows a wastewater treatment apparatus 1 according to this embodiment. As shown in Figure 1, this wastewater treatment apparatus 1 comprises a treatment tank body 3 that performs a predetermined treatment on wastewater 2, manholes 4 to 6 provided on the upper surface of the treatment tank body 3, and lid members 7 to 9 that are attached to the manholes 4 to 6, respectively.

[0018] The treatment tank body 3 has a plurality of treatment tanks 10 to 14 and an internal space 15 that houses the plurality of treatment tanks 10 to 14. Manholes 4 to 6 connect the internal space 15 and the external space 16.

[0019] In this embodiment, treatment tank 10 is the first anaerobic tank, treatment tank 11 is the second anaerobic tank, treatment tank 12 is the biological activated carbon tank, treatment tank 13 is the solid-liquid separation layer, and treatment tank 14 is the disinfection layer. Wastewater 2 that flows into the internal space 15 of the purification treatment apparatus 1 passes through these treatment tanks 10 to 14 in order from upstream, so that organic substances in the wastewater 2 are decomposed or removed, and after the wastewater 2 has been purified, it is discharged as treated water 17.

[0020] Here, as the anaerobic tanks constituting each of the treatment tanks 10 and 11, a known configuration can be adopted. Similarly, a known configuration can also be adopted for the treatment tank 12 constituted by a biological activated carbon tank, the treatment tank 13 constituted by a solid-liquid separation layer, and the treatment tank 14 constituted by a disinfection layer.

[0021] It should be noted that the arrangement of the treatment tanks 10 to 14 described above is merely an example, and it goes without saying that it can be appropriately changed depending on the application. For example, although not illustrated, at least one of the treatment tanks 10 and 11 constituted by anaerobic tanks may be replaced with an aeration tank. Similarly, for the other treatment tanks 12 to 14, they may be replaced with known biological treatment tanks, chemical treatment tanks, or physical treatment tanks as other types of treatment tanks. Similarly, the number of the treatment tanks 10 to 14 can also be increased or decreased from the number (five) shown in Fig. 1.

[0022] Fig. 2 shows a cross-sectional view of the manhole 4 located above the treatment tank 10 that is the first anaerobic tank positioned on the most upstream side, and the cover member 7 attached to the manhole 4. This cover member 7 has an accommodating portion 19 for accommodating soil 18 on the upper surface side. The accommodating portion 19 in the illustrated example is constituted by a recess formed in the cover member 7.

[0023] The accommodating portion 19 has, at the bottom thereof, a ventilation portion 19a that communicates the inner space 15 inside the treatment tank main body 3 with the inner side of the accommodating portion 19 (the side that accommodates the soil 18). In the illustrated example, the ventilation portion 19a is constituted by a plurality of fine pores (for example, 1 to 2 mm in diameter). The ventilation portion 19a can also have, for example, a mesh structure.

[0024] The cover member 7 has a flange portion 20 on a peripheral edge thereof. The flange portion 20 is supported by the throat portion of the manhole 4. A plant 22 is planted in the soil 18 accommodated in the accommodating portion 19. Although not illustrated, a breathable mat such as a non-woven fabric or a wool mat may be laid on the bottom of the accommodating portion 19.

[0025] The treatment tank body 3 and the lid members 7, 8, and 9 can be made of FRP, polyvinyl chloride, or the like. The lid members 7, 8, and 9 are also provided with handles 23 (see Figure 3), facilitating the attachment and detachment of the lid members 7, 8, and 9 to the manholes 4, 5, and 6.

[0026] In this embodiment, the recess constituting the storage portion 19 of the lid member 7 is provided to protrude toward the internal space 15. This maximizes the thickness of the soil 18 stored in the storage portion 19.

[0027] Furthermore, in this embodiment, the inner circumferential surface of the housing section 19 has a shape that narrows in diameter towards the internal space 15, making it easier to increase the density of the soil 18 towards the lower side.

[0028] As for the soil 18, any composition is applicable, as long as it contains microorganisms capable of decomposing odor components that cause malodors. Odor components such as ammonia and hydrogen sulfide can be decomposed by naturally occurring microorganisms such as ammonia-oxidizing bacteria and sulfur-oxidizing bacteria, thereby deodorizing the soil. The soil may be collected directly from the site where the purification treatment device 1 is installed, or a mixture of soil collected from multiple locations may be used. Alternatively, soil prepared to contain a large amount of specific microorganisms with excellent decomposition performance as described above may be used. Specifically, a culture medium made by mixing kanuma soil, akadama soil, and leaf mold in predetermined proportions is applicable.

[0029] Alternatively, a growing medium may be applied that is made by blending one or more of the above-mentioned types of soil with plant-derived compost, such as that obtained by fermenting and decomposing fruit (such as mandarin orange) pomace. By blending in the above-mentioned types of compost, the odor removal effect can be further enhanced. Furthermore, if plant-derived compost is used, it will have almost no odor when mixed with soil 18.

[0030] Furthermore, citric acid may be added to the soil. The guideline for the amount added is that the overall pH of the soil should be 5.5 or lower, preferably 5.0 or lower, and more preferably 4.5 or lower. Citric acid in the soil reacts with ammonia to produce ammonium citrate, which is efficiently absorbed by the roots of plants 22. Therefore, it is possible to effectively remove or suppress malodors caused by ammonia. In addition, the absorption of citric acid by the roots of plants 22 after it reacts with ammonia promotes the growth of plants 22. Moreover, citric acid itself has the advantage of promoting the growth of at least certain plants 22 (for example, ammonia-loving plants such as tea, which will be described later).

[0031] Of course, the substances that can be added to soil 18 are not limited to those exemplified above. For example, activated carbon, charcoal, zeolite (either natural or synthetic), peat moss, and other substances may be added as needed.

[0032] The plants 22 planted in the soil 18 are, in principle, of any choice, but ammonia-loving plants such as rice, tea, cranberry, blueberry, taro, pineapple, and barnyard millet are suitable because they absorb ammonia, which is often the main cause of bad odors, as their primary nutrient source.

[0033] As described above, in the purification treatment apparatus 1 according to this embodiment, a containment section 19 for containing soil 18 is provided in the lid member 7 attached to the manhole 4, and a ventilation section 19a is provided in the containment section 19. As a result, organic substances that cause malodors contained in the gas in the internal space 15 are decomposed by microorganisms contained in the soil 18 contained in the containment section 19. Therefore, without providing special deodorizing equipment, it is possible to eliminate or reduce malodors in the internal space 15 of the purification treatment apparatus 1, thereby preventing or significantly reducing the leakage of malodors as much as possible. In addition, the gas present in the internal space 15 of the purification treatment apparatus 1 is always in a state containing a lot of moisture due to its characteristics. Therefore, as a result of constantly supplying abundant moisture to the microorganisms contained in the soil 18, it is possible to continuously exert a stable deodorizing effect. In particular, as in this embodiment, by applying the present invention to the lid member 7 that closes the manhole 4 located above the treatment tank 10 which constitutes the anaerobic tank where the leakage of malodors is most of concern, it is possible to prevent the leakage of malodors more effectively.

[0034] Furthermore, in this embodiment, since plants 22 are planted in the soil 18, the roots of the plants 22 spread throughout the soil 18. As a result, the soil 18 can be firmly held in place by these spreading roots. Consequently, the soil 18 is stably held against wind and rain, and this also makes it possible to continuously exert a stable deodorizing effect. In addition, because plants 22 are planted, it is possible to prevent situations such as a person accidentally stepping through the soil 18 in the lid member 7. Thus, it is possible to retain the soil 18 for a long period of time.

[0035] In the above description, we have explained the cover member 7 that is attached to manhole 4, but the cover members 8 and 9 that are attached to manholes 5 and 6, respectively, can also be configured in the same way as the cover member 7.

[0036] Although one embodiment of the present invention has been described above, the purification treatment apparatus 1 according to the present invention is not limited to the above-described example configuration, and various modifications are possible within the scope of the present invention. For example, the cover member 7 of the present invention can be applied only to manhole 4, and conventional manhole covers can be used for the cover members attached to the other manholes 4 and 6. [Explanation of Symbols]

[0037] 1. Purification treatment device 2 Drainage 3. Processing tank body 4, 5, 6 Manholes 7,8,9 Lid members 19. Detention Unit 19a Ventilation section 18 Soil 22 Plants

Claims

1. A treatment tank body that applies a predetermined purification treatment to wastewater, A manhole is provided on the upper surface of the main body of the processing tank, The manhole comprises a cover member that is attached to the manhole, The lid member has a receiving section on its upper side for containing soil, The housing section has a ventilation section that connects the inside of the processing tank body and the inside of the housing section. Purification treatment equipment.

2. The purifying apparatus according to claim 1, wherein the lid member has a recess that constitutes the housing portion.

3. The purification apparatus according to claim 1, wherein soil is contained in the aforementioned containment section.

4. The purification apparatus according to claim 3, wherein the soil is blended with plant-derived compost.

5. The purification apparatus according to claim 3, wherein plants are planted in the soil.

6. The purification apparatus according to claim 5, wherein citric acid is added to the soil.

7. A lid member to be fitted into the manhole of a septic tank device, wherein the lid member has a containment portion on its upper side for containing soil, and the containment portion has a ventilation portion that connects the inside of the treatment tank body of the septic tank device with the inside of the containment portion.

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