JP2002143832A - Circulation type water supply and discharge system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circulation type water supply and drain system which reuses the waste water produced at a construction site. SOLUTION: The system includes a water supply tank 1 to reserve the water to be used in the construction site 4, a water drain tank 2 to reserve the waste water produced in the construction site, and a turbid water treating device 3 to treat turbid water. The water in the water supply tank is supplied to the construction site through a water supply pipe 11, while the waste water produced in the construction site is sent through a water drain pipe 21 to the above water drain tank or water supply tank. Turbid water in the water drain tank is sent to the turbid water treating device and subjected to the treatment for turbid water. The treated water by the treatment for turbid water is sent to the water supply tank to circulate the water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulation type water supply / drainage system for reusing water used at a construction site.

[0002]

2. Description of the Related Art Conventionally, wastewater generated from a construction site is
Turbid water treatment was performed to discharge the water after reaching a predetermined water quality standard value. In recent years, awareness of environmental protection has been increasing, and when draining water, it is necessary to perform treatment that meets strict water quality standards. In the case of using the sewer, untreated wastewater was directly passed to the sewer. And the water used at the construction site has been newly supplied from a water intake device or water supply.

[0003]

The above conventional water supply and drainage system has the following problems. <B> When draining water after turbid water treatment, advanced treatment must be performed to meet high water quality standards.
For this reason, turbid water treatment is very expensive. <B> In order to supply newly used water, it is necessary to separately receive or supply water. For this reason, water intake costs or water charges are required. <C> When treating wastewater using the sewer, the amount of sewer used is required. Further, in this case, since the wastewater is not reused, it is necessary to newly supply water for use in the construction.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems, and an object of the present invention is to provide a circulation type water supply / drainage system which reuses wastewater generated at a construction site. It is another object of the present invention to provide a circulation type water supply / drainage system capable of greatly reducing the amount of fresh water used for construction. In particular, it is an object of the present invention to provide a circulating water supply and drainage system capable of effectively utilizing water resources by reusing all wastewater generated at a construction site. Another object of the present invention is to provide a circulating water supply and drainage system that can significantly reduce the cost of turbid water treatment. In particular, it is an object of the present invention to provide a circulating water supply and drainage system that does not require strict management of water quality standards for treated water subjected to turbid water treatment. The present invention achieves at least one of these objects.

[0005]

In order to achieve the above object, a circulation type water supply / drainage system according to the present invention comprises a water supply tank for storing water used at a construction site, and a water supply tank for storing wastewater generated at the construction site. And a turbid water treatment device for treating turbid water, supplying water in the water tank to a construction site through a water supply pipe, and draining water generated at the construction site through the drain pipe to the drain tank or the water tank. The turbid water in the drainage tank is supplied to the turbid water treatment device to perform turbid water treatment, and the turbid water treated water is supplied to a water supply tank to circulate the water. In particular, it is preferable to reuse all wastewater generated at the construction site.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

<A> Overall Configuration The circulation type water supply / drainage system of the present invention comprises a water supply tank 1, a drainage tank 2, a turbid water treatment device 3, and a water supply pipe 11, a drain pipe 21, a turbid water pipe 31 and the like connecting these. I do. All the water flowing in the circulation type water supply and drainage system circulates in the circulation type water supply and drainage system except for water consumed in construction, evaporated water, and water leakage.

<B> Water Supply Tank The water supply tank 1 is a water tank for storing construction water used at the construction site 4. The water supply tank 1 is replenished with fresh water from a water truck or water supply at the start of the operation of the circulation type water supply and drainage system and when the amount of water in the circulation type water supply and drainage system becomes insufficient. When the circulation type water supply / drainage system is operating, the treated water treated by the following turbid water treatment device 3, the water in the drainage tank 2, the wastewater, and the surplus water of the supplied water are supplied to the water supply tank 1.
To supply.

<C> Drain Tank The drain tank 2 is a tank for storing drainage such as turbid water generated from the construction site 4. The water in the drainage tank 2 is sent to the turbid water treatment device 3. Here, a part of the water in the drainage tank 2 may be sent to the water supply tank 1 without any treatment. For example, it is used as makeup water when the water level in the water supply tank 1 is lowered.

<D> Turbid Water Treatment Device The turbid water treatment device 3 is a treatment device for bringing turbid water close to fresh water. For example, turbid water is processed into water that meets a predetermined water quality standard. The turbid water treatment device 3 includes, for example, a mixing tank 33, a settling tank 34, a measuring tank 35, a treated water tank 32, a filter press 36, and the like. The mixing tank 33 is a water tank that stores water obtained by mixing a polymer flocculant and turbid water in a stirring tank. PH (pH) is measured in the mixing tank 33 as necessary.
The water that has passed through the mixing tank 33 is sent to a granulation tank and a precipitation tank 34. The supernatant of the settling tank 34 is sent to the measuring tank 35. The contaminated water collected at the bottom of the granulation tank or the sedimentation tank 34 is passed through a filter press 36, and the water is sent to a measuring tank 35. The water sent to the measuring tank 35 is sent to the treated water tank 32 after measuring the PH and the flow rate. The treated water in the treated water tank 32 measures the turbidity as necessary and sends it to the water supply tank 1.

<E> Flow of Water in the Circulation Type Water Supply / Drainage System The construction water supplied from the water supply tank 1 is sent to the construction site 4 through the water supply pipe 11. Here, when the amount of water used in the construction is small, the water is returned to the water supply tank 1 from the middle of the water supply pipe 11 as surplus water. Then, the drainage generated at the construction site 4 is sent to the drainage tank 2 through the drainage pipe 21.
Here, a part of the drainage flowing through the drain pipe 21 may be sent to the water supply tank 1 without being treated. The water in the drainage tank 2 is sent to the turbid water treatment device 3. Here, a part of the water in the drainage tank 2 can be sent to the water supply tank 1 as makeup water. The water sent to the turbid water treatment device 3 is sent to the water supply tank 1 as treated water. Water circulates in the circulation type water supply / drainage system as described above. Note that the circulation type water supply / drainage system of the present invention can be operated automatically. In addition, the amount of water in the circulation type water supply and drainage system decreases due to consumption in construction and the water tank 1
If the water level of the water drops, replenish the fresh water tank with fresh water. Even in this case, since the wastewater is reused as much as possible, the amount of water to be replenished may be smaller than before.

[0012]

As described above, the circulation type water supply / drainage system of the present invention has the following effects. <B> Reuse the wastewater generated at the construction site. Therefore, the amount of fresh water to be supplied can be significantly reduced. <B> Do not discharge wastewater generated at the construction site outside the circulation type water supply and drainage system. For this reason, it is not necessary to strictly control the water quality standards of the wastewater generated at the construction site. As a result,
The cost of turbid water treatment can be reduced. <C> Reuse construction wastewater, which is treated as clean treated water at the expense of turbid water treatment, without discharging it. That is, water resources can be effectively used. <Iv> Controlling the circulation speed is also effective in preventing freezing of water (-20 ° C).

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of a circulation type water supply / drainage system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Water supply tank 11 ... Water supply pipe 2 ... Drainage tank 21 ... Drainage pipe 3 ... Turbid water treatment apparatus 31 ... Turbid water pipe 4 ... Construction site

Claims (1)

[Claims] 1. A water supply tank for storing water used at a construction site, a drainage tank for storing wastewater generated at the construction site, and a turbid water treatment device for treating turbid water, wherein the water in the water supply tank is provided. Supplying water to the construction site through a water supply pipe, sending wastewater generated at the construction site to the drainage tank or the water supply tank through a drainage pipe, sending turbid water in the drainage tank to the turbid water treatment device to perform turbid water treatment, A circulation type water supply / drainage system characterized by circulating water by sending turbid water treated water to a water supply tank.