JP2003266061A - Treatment method for waste water in water-bearing gas holder and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method for waste water in a water-bearing gas holder which can reduce the treatment cost including the transportation cost and shorten the treatment time, and an apparatus therefor. <P>SOLUTION: The waste water treatment method comprises a process for supplying water and oil stored in the water-bearing gas holder as primary waste water to a raw water tank by an extraction pump, a process for floating the oil contained in the primary waste water in the raw water tank to be removed by a floating oil remover and then making the residual water flow into a control tank as secondary waste water, a process for discharging the secondary waste water in the control tank to a filter by a drainage pump and filtering it while sticking suspended solids therein to the inside of the filter, and a process for releasing the water after filtration as filtered water. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating waste water in a water gas holder.

[0002]

2. Description of the Related Art At present, in a pressure regulating station, water and oil are injected into an unused gas holder in order to prevent rusting. The water and oil are extracted when the gas holder is dismantled and discarded or reused. In the past, the water and oil were extracted and transported to a distant wastewater treatment plant by a tank truck to perform predetermined wastewater treatment. Therefore, there is a problem that the processing cost including the transportation cost is high and the processing time is long.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can reduce the processing cost including the transportation cost and reduce the processing time. It is an object of the present invention to provide a wastewater treatment method and apparatus therefor.

[0004]

In order to achieve the above object, a method for treating wastewater in a water-containing gas holder according to the present invention is a method in which water and oil accumulated in the water-containing gas holder are extracted as primary wastewater by a raw water pump. A step of sending it to a tank, a step of levitating the oil contained in the primary waste water in the raw water tank and removing it with a floating oil removing device, and then flowing the remaining water into the control tank as secondary waste water; A step of draining the secondary waste water in a secondary filter into a filtration filter with a drainage pump, depositing suspended matter in the secondary waste water inside the filter to filter the secondary waste water, and filtering the secondary filtered water. And a step of discharging the product.

The method for treating wastewater in the water-containing gas holder according to the present invention is characterized in that the operation of the extraction pump and the drainage pump is controlled according to the amount of secondary wastewater flowing into the control tank.

Further, in the wastewater treatment method in the water-containing gas holder according to the present invention, a coagulant is added to the primary wastewater in the raw water tank or the secondary wastewater in the control tank to add the primary wastewater or the secondary wastewater. It is characterized by aggregating the suspended solids.

Further, the method for treating waste water in the water-containing gas holder according to the present invention is characterized in that the floating substances adhering to the inside of the filtration filter are taken out from the filtration filter, washed, and then dehydrated by a dehydrator.

In order to achieve the above object, the waste water treatment apparatus in the water-containing gas holder according to the present invention is a raw water for storing water and oil extracted from the water-containing gas holder via a discharge pump as primary waste water. A tank, a floating oil removing device attached to the raw water tank for removing floating oil from the primary wastewater, and a control tank for storing water after floating oil removal flowing out of the raw water tank as secondary wastewater And a filtration filter to which the suspended matter in the secondary wastewater discharged from the control tank through a drainage pump is attached to filter the secondary wastewater.

In the wastewater treatment device in the water-containing gas holder according to the present invention, a level meter for detecting the amount of the secondary wastewater in five levels is installed in the control tank, and the wastewater treatment device as a whole is stopped at the upper limit. The extraction pump is stopped at the upper limit, the extraction pump is operated at the first lower limit, the drainage pump is operated at the second lower limit, and the drainage pump is stopped at the lowest limit.

Further, the waste water treatment device in the water-containing gas holder according to the present invention is characterized in that a coagulant dropping device is attached to the raw water tank or the control tank.

Further, the wastewater treatment apparatus in the water-containing gas holder according to the present invention is characterized in that a pressure sensor for detecting the internal pressure of the filtration filter is attached to the filtration filter.

Further, the wastewater treatment apparatus in the water-containing gas holder according to the present invention is characterized by comprising a dehydrator for dehydrating the suspended matter taken out from the filtration filter and washed.

[0013]

[Operation] When dismantling, discarding or reusing the water gas holder,
By carrying in the wastewater treatment device of the present invention, temporarily installing it, and extracting water and oil from the water gas holder to perform treatment, the treated water can be discharged as it is to sewage or a river, and only suspended substances are disposed as industrial waste. As a result, the processing cost including the transportation cost can be significantly reduced and the processing time can be significantly reduced as compared with the conventional method.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, a water-containing gas holder 1 is arranged at the left side position. Water and oil are injected into the water-containing gas holder 1, and the sludge 1A that has settled at the bottom, the water 1B at the upper part, and the floating oil 1C at the upper part of the water 1B are layered. Stored. Then, a wastewater treatment device M is carried in and temporarily installed on the outer right side of the water-containing gas holder 1.

Next, the wastewater treatment device M will be described. Immediately outside the wet gas holder 1 is a raw water tank 3 for storing water 1B and oil 1C extracted from the wet gas holder 1 via a discharge pump 2 as primary waste water, and above the raw water tank 3. 1C of oil floating from the primary wastewater
A flotation oil removing device 4 for removing the coagulant and a flocculant dropping device 5 for adding a coagulant for coagulating the suspended solids in the primary wastewater to the primary wastewater are attached.

The raw water tank 3 is located downstream of the raw water tank 3.
A control tank 6 is arranged for storing the water after the floating oil removed from the tank is stored as secondary waste water. As shown in FIG. 2, the control tank 6 is provided with a level meter 9 for detecting the amount of the secondary wastewater in five stages, with the upper limit being a, the upper limit being b, the first lower limit being c, and the first lower limit being c. 2 The lower limit is d and the lower limit is e.

Then, downstream of the control tank 6, suspended substances in the secondary wastewater drained from the control tank 6 through the drainage pump 8 are attached to filter the secondary wastewater by filtration filters 7A, 7B. Is disposed, and the filtration filter 7
A and 7B have pressure sensors 10A and 10B for detecting their internal pressures.
B is attached. On-off valves 11A and 11 for opening and closing the flow path of the secondary waste water are provided directly above the filtration filters 7A and 7B.
B is attached.

Further, a washing tank 12 for washing suspended substances in the secondary waste water taken out from the filtration filters 7A, 7B is arranged downstream of the filtration filters 7A, 7B, and downstream of the washing tank 12. A vacuum filter 13 as a dehydrator for dehydrating the washed suspended matter is arranged.

In the thus constructed apparatus, first, the water 1B and the oil 1C stored in the water-containing gas holder 1 are sent to the raw water tank 3 by the extraction pump 2 as primary waste water. Next, the primary wastewater in the raw water tank 3 is left for a predetermined time to float the oil 1C contained in the primary wastewater, and then the floating oil 1C is removed by the floating oil removing device 4. Further, the flocculant dropping device 5 adds a flocculant to the primary wastewater in the raw water tank 3 to flocculate suspended solids in the primary wastewater. Here, the suspended matter refers to, for example, iron, and examples of the aggregating agent in the case of iron include lime, polyaluminum chloride, and the like.

Next, the water treated as described above in the raw water tank 3 is caused to flow into the control tank 6 as secondary waste water. In the control tank 6, the level of the secondary waste water flowing in is detected by the level meter 9, and the operation of the extraction pump 2 and the drainage pump 8 is controlled according to the amount of the water. Specifically, as described above, the water amount is detected in five stages, the entire wastewater treatment device M is stopped at the maximum upper limit a, the extraction pump 2 is stopped at the upper limit b, and the extraction pump 2 is extracted at the first lower limit c. The pump 2 is operated, the drainage pump 8 is operated at the second lower limit d, and the drainage pump 8 is stopped at the lowest limit e so that the amount of water in the control tank 6 is constantly maintained at an appropriate amount.

Next, the secondary wastewater in the control tank 6 is drained to the filtration filters 7A and 7B by the drainage pump 8 and the suspended matter in the secondary wastewater is adhered to the filtration filters 7A and 7B so that the secondary wastewater is discharged. After being filtered, the filtered water is discharged as filtered water into sewage or a river. It is not always necessary to use both of the filtration filters 7A and 7B. When performing maintenance or replacement of either one, the desired on-off valves 11A and 11B may be closed and only one may be used. .

When the above-described operation is repeated in this way, the adherence of the suspended matter in the filtration filters 7A and 7B grows, and the internal pressure of the filtration filters 7A and 7B increases.
In the present embodiment, the pressure sensors 10A and 10B attached to the filtration filters 7A and 7B constantly detect the internal pressure, and when the internal pressure reaches a predetermined value, the filtration filters 7A and 7B.
A filter unit (not shown) in the inside is taken out together with the adhered and grown floating substances, and set in the cleaning tank 12. Then, while the filter unit in the cleaning tank 12 is rotated by a motor (not shown), cleaning water is supplied from a pipe (not shown) to separate suspended substances from the filter unit while cleaning them. Then, the separated suspended solids are sent to the vacuum filter 13 together with washing water to be dehydrated and solidified. Then, the solidified suspended matter is disposed of as industrial waste.

In the embodiment of the present invention, the raw water tank
Although the flocculant dropping device 5 is attached to 3 to flocculate suspended solids in the primary wastewater in the raw water tank 6, the flocculating agent dropping device 5 is not limited to this, and the flocculant dropping device 5 may be placed in the control tank 6.
May be additionally provided so that suspended substances in the secondary wastewater in the control tank 6 are aggregated.

In the embodiment of the present invention, the vacuum filter 13 is used as the dehydrator, but the dehydrator is not limited to this, and a filter press, a belt filter or the like may be used as the dehydrator. Good.

[0025]

As is apparent from the above description, the present invention comprises a step of sending water and oil stored in a water-containing gas holder to a raw water tank as a primary waste water by a discharge pump, and the primary water in the raw water tank. After the oil contained in the wastewater is floated and removed by the floating oil removal device, the remaining water is allowed to flow into the control tank as secondary wastewater, and the secondary wastewater in the control tank is drained to a filtration filter. The treated water has the steps of draining and depositing the suspended solids in the secondary wastewater inside the filter to filter the secondary wastewater, and discharging the filtered water as filtered water. Can be discharged directly to sewage or rivers, and only suspended solids need to be disposed of as industrial waste, which can significantly reduce processing costs, including transportation costs, and significantly reduce processing time compared to conventional methods. But .

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the present invention.

FIG. 2 is a diagram showing details of a level meter installed in a control tank.

[Explanation of symbols]

1 Water gas holder 1B water 1C oil 2 Extraction pump 3 Raw water tank 4 Floating oil remover 5 Flocculant dropping device 6 control tank 7A 7B Filtration filter 8 drainage pump 9 level meter 10A 10B Pressure sensor 13 dehydrator M wastewater treatment equipment

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideki Morimoto             3-1, Honohara, Toyokawa City, Aichi Prefecture             -In Blast Co., Ltd. F-term (reference) 4D015 BA19 BB05 CA06 DA04 DA23                       EA35 FA01 FA14                 4D051 AA01 BA09                 4D066 BB01 BB31 EA03 EA06 EA11                       FA01

Claims (9)

[Claims] 1. A step of sending water and oil accumulated in a water-containing gas holder as a primary waste water to a raw water tank by an extraction pump, and floating the oil contained in the primary waste water in the raw water tank to remove floating oil. After removal by the device, a step of flowing the remaining water into the control tank as secondary wastewater, and draining the secondary wastewater in the control tank to a filtration filter with a drainage pump to remove suspended matter in the secondary wastewater. A method for treating wastewater in a water-containing gas holder, comprising: a step of adhering the secondary wastewater to a filtration filter to filter the secondary wastewater; and a step of discharging the filtered water as filtered water. 2. The method for treating wastewater in a water-containing gas holder according to claim 1, wherein the operations of the extraction pump and the drainage pump are controlled according to the amount of secondary wastewater flowing into the control tank. . 3. A flocculating agent is added to the primary wastewater in the raw water tank or the secondary wastewater in the control tank to flocculate suspended solids in the primary wastewater or the secondary wastewater. Item 3. A method for treating wastewater in a water-containing gas holder according to item 1 or 2. 4. The water-containing gas holder according to claim 1, wherein the suspended solids adhering to the inside of the filtration filter are taken out from the filtration filter, washed, and then dehydrated by a dehydrator. Wastewater treatment method. 5. A raw water tank for storing water and oil extracted from the water-containing gas holder via an extraction pump as primary waste water, and an oil attached to the raw water tank to remove floating oil from the primary waste water. A floating oil removing device, a control tank for storing the water after floating oil removal flowing out from the raw water tank as secondary wastewater, and a floating in the secondary wastewater drained from the control tank via a drainage pump. A waste water treatment device in a water-containing gas holder, comprising: a filtration filter to which a substance is attached to filter the secondary waste water. 6. A level meter for detecting the amount of the secondary wastewater in five levels is installed in the control tank, the entire wastewater treatment device is stopped at the upper limit, and the extraction pump is stopped at the upper limit. 6. The wastewater treatment device in the water-containing gas holder according to claim 5, wherein the extraction pump is operated at the lower limit, the drainage pump is operated at the second lower limit, and the drainage pump is stopped at the lowest limit. 7. The waste water treatment device in the water-containing gas holder according to claim 5, wherein a coagulant dropping device is attached to the raw water tank or the control tank. 8. The wastewater treatment device in the water-containing gas holder according to claim 5, wherein a pressure sensor for detecting an internal pressure of the filtration filter is attached to the filtration filter. 9. The wastewater treatment device in the water-containing gas holder according to claim 5, further comprising a dehydrator for dehydrating the suspended matter taken out from the filtration filter and washed.