JP-3255702-U - Septic tank treated water recirculation system

Abstract

[Problem] The objective is to provide a wastewater recirculation system for septic tanks that promotes the effective use of water resources and allows toilets to be used even when the supply of tap water is interrupted during droughts or disasters. [Solution] The septic tank treated water recirculation system 100 comprises a septic tank 1 in which an anaerobic first tank 11, an anaerobic second tank 12 located downstream of the first tank 11, and an aerobic third tank 13 and a disinfection tank located downstream of the second tank 12 are connected in series in this order; a recirculation tank 2 for storing treated water treated in the third tank 13; and a supply means for supplying the treated water in the recirculation tank 2 to non-drinking water facilities 5. The recirculation tank 2 is set to have a capacity greater than or equal to the amount of water used by the water facilities 5 for a predetermined period during a water outage. [Selection Diagram] Figure 1

Inventors

• 西久保 純一

Assignees

• 西久保 純一

Dates

Publication Date

20260508

Application Date

20260303

Claims (5)

1. A septic tank that receives wastewater from plumbing fixtures, A circulation tank for storing treated water that has been purified in the aforementioned septic tank, A septic tank treated water recirculation system characterized by comprising a supply pipe and a supply pump for supplying treated water in the recirculation tank to non-drinking water facilities.
2. The septic tank treatment water circulation system according to claim 1, characterized in that the septic tank comprises an anaerobic first tank, an anaerobic second tank located downstream of the first tank, an aerobic third tank located downstream of the second tank, and a disinfection tank, all connected in series in this order.
3. The wastewater recirculation system for a septic tank, according to claim 1, wherein the recirculation tank is set to have a capacity equal to or greater than the amount of water used by the water supply equipment for one to three days under normal conditions.
4. The supply pump is configured to be able to supply treated water manually even during a power outage. The wastewater recirculation system for a septic tank according to claim 1.
5. The wastewater treatment tank recirculation system according to claim 1, wherein a photocatalytic water purification device is provided in the path that supplies the treated water in the recirculation tank to the water supply equipment.

Description

This invention relates to a treated water circulation system that circulates treated water obtained by purifying domestic wastewater in a septic tank. Conventionally, septic tanks are known for purifying wastewater such as human waste and domestic wastewater discharged from homes and other sources. For example, Patent Document 1 discloses a water treatment device that purifies wastewater from ordinary homes and other sources in stages using multiple tanks. This device comprises a first anaerobic filter tank and a second anaerobic filter tank that decompose organic matter in the wastewater using anaerobic microorganisms attached to the filter media, and a carrier-fluidized biological filtration tank that aerobically decomposes organic matter by flowing a carrier to which aerobic microorganisms are attached. Japanese Patent Publication No. 2006-150227 This is a schematic diagram showing the overall configuration of the treated water recirculation system of the present invention.This figure shows an example of the ratio of wastewater volume from plumbing fixtures. The present invention will be described below with reference to the drawings, based on preferred embodiments. In the embodiments and modifications, identical or equivalent components and members will be denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. Furthermore, the dimensions of the members in each drawing will be enlarged or reduced as appropriate for ease of understanding. Also, some members that are not important for explaining the embodiments will be omitted from the drawings. Furthermore, while terms including ordinal numbers such as "first," "second," etc., are used to describe various constituent elements, these terms are used solely to distinguish one element from others, and do not limit the elements themselves. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing the overall configuration of the septic tank treated water recirculation system 100 according to the embodiment. In this figure, arrows indicate the flow of water such as drinking water, wastewater, and treated water. Figure 2 shows an example of the ratio of water usage for plumbing fixtures. As shown in Figure 2, household wastewater is distributed as follows: baths account for 40%, toilets 25%, kitchens/washrooms 20%, and laundry/other 15%. Even just by circulating and reusing treated wastewater from toilets, significant water savings are possible. This invention achieves significant water savings by circulating treated wastewater. As shown in Figure 1, the septic tank treated water recirculation system 100 of this invention comprises a septic tank 1, a recirculation tank 2, supply piping 3, a supply pump 4, and water supply equipment 5. A photocatalytic water purification device 8 may also be included. The septic tank 1 is configured with an anaerobic first tank 11, an anaerobic second tank 12, and an aerobic third tank 13 connected in series in this order. The first tank 11 removes suspended solids from the wastewater using filter media and purifies the wastewater by decomposing organic matter through the action of anaerobic microorganisms that do not require oxygen. The second tank 12 removes fine suspended solids from the wastewater treated in the first tank 11 using finer filter media and further purifies the wastewater by decomposing organic matter through anaerobic microorganisms. The third tank 13 aerates and circulates the wastewater using air supplied by an air pump (not shown), and further purifies the wastewater by decomposing organic matter through the action of aerobic microorganisms attached to the contact material. While the above-described configuration of the first, second, and third tanks has been used for septic tank 1, this configuration is merely an example, and any septic tank used for household wastewater treatment can be used as desired. The treated water purified in the third tank 13 flows further into a disinfection tank, which is located downstream of the third tank 13 and separated by a partition. The water entering the disinfection tank flows into the recirculation tank 2, where it is stored. In this invention, treated water that would normally be discharged from the septic tank 1 can be temporarily stored by providing the recirculation tank 2 downstream of the septic tank 1. The treated water stored in the recirculation tank 2 is further purified by naturally occurring bacteria and other microorganisms. A supply pipe 3 and a supply pump 4 are connected to the recirculation tank 2, and the treated water is supplied to the plumbing equipment 5. Any treated water stored in the recirculation tank 2 exceeding a predetermined amount is discharged to the outside. The plumbing facilities 5 include the water supply side plumbing facilities 51 and the circulation side plumbing facilities 52. The water sup