JPH10323519A - Waste water treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat waste water from an egg treating plant, etc., free from maintenance for a long period by using a compact filter so as to enable it to install side by side even at an existing plant. SOLUTION: This device consists of plural filters F1, F2 provided with differential pressure sensors S1, S2 for detection of clogging, a storage tank T for housing filter washing water, plural valves V1, V2 for switching flow paths and a control part C for controlling the valves. The control part C works the valves V1, V2 to discharge the waste water as water cleaned with the filters F1, F2 and works the valves V1, V2 after a specified time lapses or with a clogging detection signal to wash the filter required to wash with the water cleaned with a washed-off filter and feeds the washed water to the storage tank T and then works the valves V1, V2 to discharge the waste water as the water cleaned with the washed-off filters. Since a waste water treatment is performed, while the filter is washed, the treatment can be performed with a compact filter free from maintenance for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating wastewater discharged from eggs, slaughterhouses, catering establishments, cafeterias, etc. to remove proteins, fats, etc., contained in the wastewater. The present invention relates to a device for draining water.

[0002]

2. Description of the Related Art For example, dirty water used for washing eggs and the like in an egg processing plant has conventionally been passed through drains and the like without any treatment. Due to the proteins and fats contained in the wastewater, bacteria proliferated and gave off a bad smell. However, due to the special circumstances of the egg industry, full-scale wastewater treatment facilities have not been introduced yet.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wastewater treatment apparatus which can be easily installed side by side in a small and operating factory or the like, and which can be used for a long time without maintenance. Therefore, it is an object of the present invention to prevent the clogging while using a small filter having a large filtration area.

[0004]

The present invention has the following features. That is, provided with a differential pressure sensor that detects clogging, a plurality of filters that are supplied with pressurized wastewater, a storage tank that stores cleaning water generated by cleaning the filter,
It comprises a plurality of flow path switching valves and a control unit for operating the valves.

The control unit operates the valve to filter waste water with a filter and discharge it as purified water, and after a certain period of time or when a detection signal of clogging is detected, the control unit operates the valve to clean the filter. The filter requiring washing is washed with the purified water for a certain period of time, and the washing water is sent to a storage tank. Then, the valve is operated, and the wastewater is filtered by the washed filter to be drained as purified water.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a wastewater treatment apparatus provided in a chicken egg processing plant equipped with two filters will be described with reference to FIG. 1. Referring to FIG. To a drain pipe 11. V1 is a first valve for switching the flow path, which is connected to the water pump P by the water pipe 12.

F1 is a first filter, and F2 is a second filter, both of which are provided with an organic filtration membrane, an inorganic filtration membrane, and other known filtration materials, and are small and can be juxtaposed in a chicken egg processing plant. When water flows in the opposite direction to the flow of water at the time of filtration, both of these filters F1 and F2 discharge waste collected in the filter medium to the outside of the filters. One end of the first filter F1 is connected to the first valve V1, and one end of the second filter F2 is connected to the first valve V1 by the second pipe 2. T is a storage tank, which is connected to the first valve V1 by the third pipe 3. As the storage tank T, a tank that can be sealed so as not to leak odor is used.

[0008] V2 is a second valve for switching the flow path.
The pipe 4 is connected to the other end of the first filter F1 and the fifth pipe 5 is connected to the other end of the second filter F2. Reference numeral 13 denotes a drain pipe connected to the second valve V2. Note that both the first valve V1 and the second valve V2 employ electromagnetic valves.

Reference numeral C denotes a control unit of the wastewater treatment apparatus, which is provided at regular intervals or from a first differential pressure sensor S1 attached to the first filter F1, and a second differential unit attached to the second filter F2. The first valve V1 and the second valve V2 are controlled by the clogging detection signal from the pressure sensor S2. The control unit C also controls the water pump P as necessary.

First, as shown in FIG. 2, waste water from an egg washing machine is supplied to a water supply pipe 12 and a first valve V by a water supply pump P.
1. The wastewater is sent to the first filter F1 via the first pipe 1, and the waste such as protein contained in the wastewater is filtered to be purified water. This purified water is drained to a drainage channel or the like by a drain pipe 13 via a fourth pipe and a second valve V2. At this time, the port on the second filter F2 side of the first valve V1, the port on the storage tank T side, and the port on the second filter F2 side of the second valve V2.
Is closed.

When a certain time has elapsed since the operation of the wastewater treatment apparatus was started, or when the first differential pressure sensor S1 detects that the pressure difference before and after the first filter F1 has reached a set value or more, FIG. As shown, the wastewater sent to the first valve V1 is sent to the second filter F2 via the second pipe 2 and is filtered to be purified water. Purified water is the fifth pipe 5, the second valve V
2, and is sent to the first filter F1 via the fourth pipe 4.
After washing the first filter F1, the washing water containing high-concentration waste is sent to the storage tank T via the first pipe 1, the first valve V1, and the third pipe 3. At this time,
The port on the drain pipe 13 side of the second valve V2 is closed.

When the washing of the first filter F1 is completed after a short time, the wastewater is sent to the second filter F2 via the first valve V1 and the second pipe 2 to become purified water as shown in FIG. Water is discharged by a drain pipe 13 through a pipe 5 and a second valve V2. At this time, the port on the first filter F1 side of the first valve V1, the port on the storage tank T side, and the port on the first filter F1 side of the second valve V2 are closed.

When the second differential pressure sensor S2 detects that a predetermined time has elapsed or that the pressure difference before and after the second filter F2 has reached a set value or more, the first valve V1 is turned on as shown in FIG. Wastewater sent to the first line via the first pipe 1
The water is sent to the filter F1 and becomes purified water.
It is sent to the second filter F2 via the valve V2 and the fifth pipe 5 to clean the second filter F2. This washing water is
It is sent to the storage tank T via the pipe 2, the first valve V1, and the third pipe 3. At this time, the drain pipe 13 of the second valve V2
The side port is closed.

When the washing of the first filter F1 is completed after a short time, the wastewater is again filtered by the first filter F1 and drained as shown in FIG. The wastewater treatment equipment is operated for a long time with maintenance free repeatedly in the order described above.

In the illustrated wastewater treatment apparatus, two filters are provided, but three or more filters can be installed. For example, while one of the three filters cleans one of the filters, the remaining one filters and drains the wastewater.
It is possible to suspend the stand.

The washing water accumulated in the storage tank T is
Separate into water and solids using a centrifuge or flocculant,
Moisture is drained to drains and solids are treated as general industrial waste.

[0017]

According to the present invention, since a plurality of filters are installed and operated while washing each other, even a small filter having a small filtration area can be operated for a long time without causing clogging. By using a small filter, the apparatus can be downsized, so that it can be easily installed in an existing egg processing plant or the like and is inexpensive.

Since the wastewater is purified and discharged to a drainage channel and the like, and the washing water containing high-concentration waste generated by washing the filter is stored in a storage tank and then treated, a sanitary environment such as a food factory can be improved.

Since the operation can be carried out for a long period of time, maintenance costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a layout diagram in a case where two filters are provided.

FIG. 2 is a flow chart when wastewater is filtered by a first filter.

FIG. 3 is a flow chart when the first filter is washed with purified water of the second filter.

FIG. 4 is a flow chart when wastewater is filtered by a second filter.

FIG. 5 is a flow chart when the second filter is washed with purified water of the first filter.

[Explanation of symbols]

 C control unit F1 first filter F2 second filter P water pump S1 first differential pressure sensor S2 second differential pressure sensor T storage tank V1 first valve V2 second valve 12 water pipe 13 drain pipe

Claims (1)

[Claims] A pressure sensor for detecting clogging,
A plurality of filters supplied with pressurized wastewater, a storage tank containing cleaning water generated by washing the filters, a plurality of valves for switching flow paths, and a control unit that operates the valves, the control unit includes: By operating the valve, the wastewater is filtered by the filter and drained as purified water, and after a certain period of time or according to the detection signal of clogging, the valve is operated, and the purified water filtered by the cleaned filter is used. A wastewater treatment device that cleans a filter that requires cleaning for a certain period of time, sends the cleaning water to a storage tank, operates a valve, filters the wastewater with the cleaned filter, and discharges it as purified water.