JP2010119910A - Waste water treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste water treatment system in which a pH value is kept constant by a simple constitution and the destruction of the environment is restrained. <P>SOLUTION: The waste water treatment system comprises: a storage tank 1 into which waste water 3 is introduced from a gutter 2, through which the introduced waste water is made to pass and from which the treated water is discharged to the ground and which has a plurality of storage chambers A, B, C divided by partition plates 9, 12 which are arrayed from the upstream side thereof to the downstream side; a peat moss layer 5 which is arranged in the uppermost-stream storage chamber A and used for lowering the pH value of the waste water 3 that is introduced from the gutter 2 and made to pass therethrough; a communicative pipeline 8 the end openings of which are made to face respectively to the lower part 7 of the upstream-side storage chamber A and to the upper part of the adjacent downstream-side storage chamber B; another communicative pipeline 11 the end openings of which are made to face respectively to the lower part of the upstream-side storage chamber B and to the upper part of the adjacent downstream-side storage chamber C; a circulation pump 15 for circulating the treated water 13 in the downstream-side storage chamber C to the uppermost-stream storage chamber A; and a discharge pump 16 for discharging the treated water 13 in the downstream-side storage chamber C. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wastewater treatment system, and more particularly, to a wastewater treatment technique capable of effectively preventing environmental destruction by neutralizing pH concentration in wastewater discharged from a specific facility.

The discarded oil is collected and subjected to processing such as oil separation and purification at a waste oil treatment plant.
This waste oil treatment plant is constructed with various treatment facilities on a large area concrete base installed on the ground, and the wastewater from this treatment plant enters a side gutter provided along the periphery of the concrete base, It is drained from the outlet to the ground.
By the way, the pH value of the wastewater from the treatment plant is generally required to be within a predetermined range centering on 7, but if the pH value specific to groundwater in the ground is high, a large amount of rainfall Occasionally, groundwater may enter the gutter and increase the pH value of the drainage discharged from the gutter.
As a conventional technique, Patent Document 1 discloses a sprayed chemical treatment device that collects, neutralizes and drains a chemical sprayed to grow a green lawn of a golf course together with rainwater through a drain pipe embedded in the lawn. It is disclosed. However, in the prior art, since the pH value of the wastewater collected in the neutralization tank has not been determined, it has been difficult to control the injection amount of the medicine to an appropriate amount.
Such problems occur not only in waste oil treatment plants, but also in facilities such as waste treatment facilities and various factories.
Utility model registration No. 2139959

The pH value of groundwater varies greatly depending on the surrounding environmental conditions. For this reason, groundwater may enter the side ditch during a large amount of rain, and the pH value of wastewater generated in various facilities such as a waste treatment facility and a factory may be changed. Therefore, even if the pH value of waste water from the facility is regulated and managed, there is no guarantee that the pH value of the treated water drained outside the facility will remain within the reference value.
Moreover, since the prior art of patent document 1 does not measure an exact pH value, there exists a problem that the medicine outside a regulation will be inject | poured.
This invention is made | formed in view of this subject, and it aims at providing the waste water treatment system which can hold | maintain pH value with a simple structure and can suppress environmental destruction. .

In order to solve this problem, the present invention provides a concrete base installed on a ground having groundwater, and an outer periphery of the concrete base that is formed along a position close to the ground. A drainage treatment system comprising: a side groove that receives drainage from a concrete base; and an oil / water separator that receives drainage discharged from the side groove and separates the oil into water and discharges it to the ground. A storage tank that is introduced and allowed to pass through the interior and then discharged to the ground, and a peat moss layer that is disposed in the storage tank and reduces the pH value in the drainage when passing the drainage from the lateral groove. It is characterized by that.
The peat moss layer uses the properties of humic acid contained in peat moss (the property of being soluble in alkali but difficult to dissolve in water) to allow the drainage from the side groove to pass through the peat moss layer, so that calcium contained in the drainage Depending on the amount of humic acid, humic acid dissolves and neutralizes the waste water. Thereby, since the quantity of humic acid is adjusted automatically, waste water can be neutralized without a complicated adjustment means.
According to a second aspect of the present invention, the storage tank has a plurality of storage chambers arranged from upstream to downstream and partitioned by a partition plate, and the peat moss layer is disposed at least in the uppermost storage chamber, and the upstream storage chamber And a communication pipe with an end opening facing each of the upper parts in the adjacent downstream storage chambers.
Drainage in the gutter is injected from the top of the peat moss layer in the uppermost storage chamber. And it is neutralized by the peat moss layer, falls to the lower part of the peat moss layer, and is stored. Therefore, the water quality is different between the upper part and the lower part with the peat moss layer as a boundary. Therefore, in the present invention, a communication pipe having an end opening facing each of the lower part and the upper part of the adjacent downstream storage chamber is provided, and the treated wastewater stored in the lower part flows into the downstream storage chamber. Thereby, the waste_water | drain before a process and the waste_water | drain after a process can be isolate | separated.

According to a third aspect of the present invention, the peat moss layer is accommodated in a case having a mesh shape or a large number of holes.
The peat moss layer is made by depositing plants such as sphagnum, reed, reed, sedge, magaya, willow, etc., and dewatering, pulverizing, and selecting humic peat. The waste water can be neutralized by passing through the waste water. Therefore, in the present invention, the peat moss layer is accommodated in a case having a mesh shape or a large number of holes. Thereby, drainage can be neutralized, making drainage pass easily, improving the handleability of a peat moss layer.
According to a fourth aspect of the present invention, the peat moss layer is distributed and stored in a mesh bag, and a plurality of the mesh bags are stored in the case body.
The peat moss layer needs to be replaced with a new one in 1-2 years. At that time, in order to perform the replacement work efficiently, the work becomes easier if the peat moss layer is divided. Therefore, in the present invention, the peat moss layer is distributed and stored in a mesh bag. Thereby, the time required for replacement of the peat moss layer can be shortened.

A fifth aspect of the present invention is characterized in that the groundwater of the ground has a pH value exceeding 7.
The peat moss layer elutes humic acid for a long time when water is applied, and the eluted water exhibits a weak acidity of pH 4-6. Therefore, the groundwater can be neutralized by mixing this elution water with alkaline groundwater. Thereby, alkaline groundwater can be easily neutralized for a long time.
6. The circulation pump according to claim 6, further comprising: a circulation pump that circulates the treated water in the downstream storage chamber into the uppermost storage chamber; and a discharge pump that discharges the treated water in the downstream storage chamber. It is characterized by having a configuration that always drives.
The treated water is discharged to the outside by a discharge pump. The treated water in the downstream storage chamber is neutralized for the time being. However, in order to ensure the reliability, the treated water is circulated again through the uppermost storage chamber and passed through the peat moss layer. Thereby, the neutralization process of processed water can be performed reliably.

Claim 7 further comprises a pH meter that measures the pH value in the downstream storage chamber, and a pump control device that drives and controls the circulation pump and the discharge pump based on the pH value measured by the pH meter, When the pH value measured by the pH meter is within a reference value range, the pump control device stops the circulation pump and drives the discharge pump, and the pH value is out of the reference value range. In this case, the circulation pump is driven to stop the discharge pump.
The treated water stored in the downstream storage chamber may be discharged as long as it is within the standard pH value range. Moreover, if it is outside the range of the standard pH value, it is necessary to drive the circulating pump again to pass the treated water through the peat moss layer in order to lower the pH value. In order to automatically perform these series of operations, a pH meter for measuring the pH value in the downstream storage chamber and means for controlling each pump are required. Therefore, in the present invention, when the pH value measured by the pH meter is within the range of the reference value, the circulation pump is stopped and the discharge pump is driven to discharge the treated water to the outside. If it is outside the range, the circulation pump is driven to stop the discharge pump so that the pH value is within the reference value. Thereby, control of pH value and control of discharge can be performed automatically.
Claim 8 includes a water level meter for detecting the water level of the treated water in the downstream storage chamber, and the pump control device detects that the water level has become a predetermined value or less by the water level meter. The discharge pump is stopped.
The discharge pump is driven when a predetermined amount of treated water is stored in the downstream storage chamber. However, the treated water in the downstream storage chamber may be small. Driving the discharge pump at such time not only damages the pump but also consumes wasted power. Therefore, in the present invention, a water level meter for detecting the water level of the treated water is provided, and when it is detected that the water level has become a predetermined value or less, the discharge pump is stopped. Thereby, damage to the discharge pump and wasteful power consumption can be prevented.

According to the present invention, a storage tank that introduces drainage from the gutter and passes through the interior and then discharges it to the ground, and a pH value in the drainage when the drainage from the gutter is placed inside the storage tank is allowed to pass. The peat moss layer is reduced, and the humic acid is dissolved in accordance with the amount of calcium contained in the waste water by passing the waste water from the side groove through the peat moss layer using the properties of humic acid contained in the peat moss Since the waste water is neutralized, the amount of humic acid is automatically adjusted, and the waste water can be neutralized without providing a complicated adjustment means.
In addition, the lower part and the upper part of the adjacent downstream storage chamber are each provided with a communication pipe that faces the end opening, and the treated wastewater stored in the lower part flows into the downstream storage chamber. Later drainage can be separated.
Moreover, since the peat moss layer is accommodated in the case body having a mesh shape or a large number of holes, the waste water can be neutralized while allowing the waste water to pass easily.
Further, since the peat moss layer is dispersed and stored in the mesh bag, the time required for replacing the peat moss layer can be shortened.

Moreover, since it circulates in the uppermost storage chamber again and passes a peat moss layer for the sake of certainty, the neutralization process of processed water can be performed reliably.
If the pH value measured by the pH meter is within the reference value range, the circulating pump is stopped and the discharge pump is driven to discharge the treated water to the outside, and the pH value is outside the reference value range. In some cases, the circulation pump is driven and the discharge pump is stopped so that the pH value falls within the reference value, so that the pH value control and the discharge control can be automatically performed.
In addition, a water level meter that detects the water level of the treated water is provided, and when it is detected that the water level has fallen below a predetermined value, the discharge pump is stopped unconditionally, so damage to the discharge pump and wasteful power consumption Consumption can be prevented.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is a diagram showing a configuration of a wastewater treatment system according to the first embodiment of the present invention. The wastewater treatment system 100 includes a storage tank 1 that introduces drainage 3 from the side groove 2 and passes through the interior and then discharges it to the ground, and a plurality of partitions that are arranged from upstream to downstream and partitioned by partition plates 9 and 12. And a peat moss layer 5 that lowers the pH value in the drainage when the drainage 3 from the side groove 2 is allowed to pass through the storage chambers A, B, and C. The lower part 7 in the side storage chamber A, the communication pipe 8 with the end opening facing the upper part in the adjacent downstream storage room B, the lower part in the downstream storage room B, and the adjacent downstream storage room The communication pipe 11 with the end opening facing the upper part in C, the circulation pump 15 for circulating the treated water 13 in the downstream storage chamber C into the uppermost storage chamber A, and the downstream storage chamber C And a discharge pump 16 for discharging the treated water 13 therein. The peat moss layer 5 is accommodated in a mesh body or a case body 4 having a large number of holes. The case body 4 is raised a predetermined distance from the bottom of the storage tank 1 by the support housing 19. Moreover, although FIG. 1 demonstrated the case where there were three storage chambers, you may increase more than this.

  Next, the schematic operation of the wastewater treatment system of the present invention will be described. The drainage 3 discharged from the side groove 2 is constituted by, for example, drainage or rainwater generated in the factory. In particular, the drainage contains an oil component, and the rainwater contains components such as acid rain and groundwater having a high pH value that oozes out from the underground. Those wastewaters 3 flow into the storage chamber A. Since the peat moss layer 5 for neutralizing the pH value is provided in the storage chamber A, the acidic water contained in the waste water is neutralized. The oil component is also separated from water by the peat moss layer 5. Here, peat moss is obtained by dewatering, pulverizing, and selecting humic peat on which plants such as sphagnum, reed, reed, sedge, magaya, and willow are accumulated. And when peat moss pours water, humic acid will elute for a long time (1-2 years), and elution water shows weak acidity of about pH 4-6. The peat moss layer 5 of the present invention allows the waste water 3 from the side groove 2 to pass through the peat moss layer 5 by utilizing the property of humic acid contained in peat moss (a property that dissolves in alkali but hardly dissolves in water). Depending on the amount of calcium contained in the waste water 3, humic acid dissolves and neutralizes the waste water.

  The drainage 3 is stored in the upper part of the peat moss layer 5, passes through the peat moss layer 5 from the hole provided in the case body 4, and is stored in the lower part 7. Then, the treated water neutralized from the communication pipe 8 facing the end opening at the lower part 7 in the upstream storage chamber A and the upper part in the adjacent downstream storage chamber B moves to the adjacent storage chamber B. . Therefore, the water does not flow into the storage chamber B until the water level in the storage chamber A exceeds the communication pipe 8. That is, the treated water 10 in the storage chamber B does not flow into the storage chamber C until the water level in the storage chamber B exceeds the communication pipe 11. Moreover, in this embodiment, the circulation pump 15 which circulates the processed water 13 in the downstream storage chamber C in the uppermost storage chamber A, and the discharge pump which discharges the processed water 13 in the downstream storage chamber C 16. At this time, the treated water 13 is appropriately discharged to the outside by the discharge pump 16. In addition, the treated water in the downstream storage chamber C has been neutralized for the time being, but in order to ensure certainty, it is circulated again in the uppermost storage chamber A and passed through the peat moss layer 5. Thereby, the neutralization process of the treated water 13 can be performed reliably.

FIG. 2A is a perspective view showing a part of the case body. The case body 4 is made of a corrosion-resistant material such as stainless steel or aluminum, and a main body having a mesh shape or a large number of holes 4a is integrated into a rectangular shape by a frame body 4b. With this as a unit, a plurality of case bodies 4 are arranged on the support housing 19 to form the lower case body 4A. A peat moss layer 5 shown in FIG. 2B is spread over the case body 4A. As described above, the peat moss 5b is a plant accumulated, so that the contents are stored in a net-like bag 5c so that the contents do not leak out and moisture passes therethrough. And the mouth of a bag is closed with the string 5a, and it is set as one bag. In this way, a plurality of bags 5c in which the peat moss 5b is divided and accommodated are spread on the case body 4A. Then, the case body 4B having the same configuration as the case body 4A is covered from above. Thereby, the peat moss layer 5 is formed between the case body 4A and the case body 4B.
Note that the peat moss layer 5 may not be housed in the bag 5c but may be sandwiched directly between the case body 4A and the case body 4B.

  That is, the peat moss layer is obtained by depositing plants such as sphagnum, reed, reed, sedge, magaya, willow, etc., and dehydrating, pulverizing, and selecting humic peat. The waste water can be neutralized by passing through the waste water. Therefore, in the present embodiment, the peat moss layer 5 is accommodated in the case body 4 having a mesh shape or a large number of holes. Thereby, the waste water can be neutralized while allowing the waste water to pass through easily. In addition, the peat moss layer 5 needs to be replaced with a new one in one to two years. At that time, in order to perform the replacement work efficiently, the work becomes easier if the peat moss layer 5 is divided. Therefore, in the present embodiment, the peat moss 5b is distributed and stored in the mesh bag 5c. Thereby, the time required for replacement of the peat moss layer can be shortened.

FIG. 3 is a diagram showing a configuration of a wastewater treatment system according to the second embodiment of the present invention. The same components will be described with the same reference numerals as in FIG. The waste water treatment system 110 differs from FIG. 1 in that a pH meter 22 that measures the pH value in the downstream storage chamber C, and the circulation pump 15 and the discharge pump 16 are driven based on the pH value measured by the pH meter 22. The pump control apparatus 20 to control and the water level meter 21 which detects the water level of the treated water 13 in the downstream storage chamber C are further provided. When the pH value measured by the pH meter 22 is within the reference value range, the pump control device 20 stops the circulation pump 15 and drives the discharge pump 16 so that the pH value is out of the reference value range. In some cases, the circulation pump 15 is driven and the discharge pump 16 is stopped.
That is, the treated water 13 stored in the downstream storage chamber C may be discharged as long as it is within the standard pH value range. If it is outside the range of the standard pH value, it is necessary to drive the circulation pump 15 to lower the pH value and to pass the treated water 13 again through the pipe 14 to the peat moss layer 5. In order to automatically perform these series of operations, a pH meter 22 that measures the pH value in the downstream storage chamber C and a pump control device 20 that controls each pump are required. Therefore, in this embodiment, when the pH value measured by the pH meter 22 is within the range of the reference value, the circulation pump 15 is stopped, the discharge pump 16 is driven, and the treated water 13 is externally supplied via the pipe 17. When the pH value is outside the range of the reference value, the circulation pump 15 is driven to stop the discharge pump 16 so that the pH value is within the reference value. Thereby, control of pH value and control of discharge can be performed automatically.

  Further, the discharge pump 16 is driven when a predetermined amount of the treated water 13 is stored in the downstream storage chamber C. However, there are cases where the treated water 13 in the downstream storage chamber C is small (the water level is lower than the discharge pump 16). When the discharge pump 16 is driven at such a time, not only the discharge pump 16 is damaged, but also wasteful power is consumed. Therefore, in this embodiment, the water level meter 21 for detecting the water level of the treated water 13 is provided, and when it is detected that the water level is equal to or lower than a predetermined value (when the water level is lower than the discharge pump 16), it is unconditionally. The discharge pump 16 is stopped. Thereby, damage to the discharge pump 16 and wasteful power consumption can be prevented.

  FIG. 4 is a flowchart for explaining the operation of the pump control apparatus of the waste water treatment system of FIG. The pump controller 20 is provided with a drive unit that receives signals detected from the pH meter 22 and the water level meter 21 and drives the circulation pump 15 and the discharge pump 16. First, the pump controller 20 reads the signal from the pH meter 22 (S1), and checks whether the pH value is within a range of 8 to 6 (S2). If the pH value is within this range (YES in S2), the circulation pump 15 is stopped (S3), and the value of the water level meter 21 is checked to check whether the water level is below a predetermined value. (S4). That is, if the water level meter 21 is set in advance at a water level position above the discharge pump 16 and the water level meter 21 stops detecting water, it is assumed that the water level is below the discharge pump. If the water level is not less than or equal to the predetermined value in step S4 (NO in S4), a signal for driving the drainage pump 16 is output (S5). If the water level is equal to or lower than the predetermined value in step S4 (YES in S4), a signal for stopping the discharge pump 16 is output (S6). On the other hand, if the pH value is out of range in step S2 (NO in S2), the discharge pump 16 is stopped (S7), and a signal for driving the circulation pump 15 is output (S8).

  FIG. 5 is a diagram showing a change in pH value of treated water treated by the wastewater treatment system of the present invention for about 3 days. The vertical axis represents the pH value, and the horizontal axis represents the day. As can be seen from this figure, the pH value fluctuates up and down around 7 until the second day, but it is understood that the reference value is sufficiently satisfied. However, it rained at point P, and immediately after that, the pH value increased to 7.8. Therefore, as a result of driving the discharge pump to discharge the treated water, the pH value temporarily decreased to the Q point. After that, it continued to rain and the maximum pH value rose to 9.2 (S point), and as a result of continuing discharge, the pH value decreased to 7.7 (T point). From this result, it is considered that the alkaline component contained in the groundwater is dissolved in the waste water and the pH value is increased due to the rain. Therefore, it is understood that it is necessary to frequently drain and circulate when it rains.

  As described above, according to the present invention, the storage tank 1 that introduces the drainage 3 from the side groove 2 and passes through the interior thereof and then discharges it to the ground, and the drainage from the side groove 2 that is disposed in the storage tank 1. A peat moss layer 5 that lowers the pH value in the waste water when passing the water, and using the property of humic acid contained in the peat moss, by passing the waste water 3 from the side groove 2 through the peat moss layer 5, Since the humic acid dissolves and neutralizes the drainage water 3 according to the amount of calcium contained in the drainage water 3, the amount of humic acid is adjusted automatically, and the drainage water 3 can be kept inside without providing complicated adjustment means. Can be summed.

Moreover, since the lower end and the upper part in the adjacent downstream storage chamber B are each provided with the communication pipe 8 facing the opening of the end portion, the treated waste water 7 stored in the lower portion flows into the downstream storage chamber B. The previous waste water 6 and the treated waste water 7 can be separated.
Moreover, since the peat moss layer 5 is accommodated in the case body 4 having a mesh shape or a large number of holes, the waste water can be neutralized while allowing the waste water to pass easily.
In addition, since the peat moss layer 5 is dispersed and stored in the mesh bag 5c, the time required to replace the peat moss layer 5 can be shortened.
Moreover, since it circulates in the uppermost storage chamber A again and passes the peat moss layer 5 in order to ensure certainty, the neutralization process of processed water can be performed reliably.
When the pH value measured by the pH meter 22 is within the range of the reference value, the circulation pump 15 is stopped and the discharge pump 16 is driven to discharge the treated water 13 to the outside. Is outside the range, the circulation pump 15 is driven and the discharge pump 16 is stopped so that the pH value falls within the reference value. Therefore, the pH value control and the discharge control can be automatically performed. it can.
In addition, a water level meter 21 for detecting the water level of the treated water is provided, and when it is detected that the water level has become a predetermined value or less, the discharge pump 16 is stopped. Consumption can be prevented.

It is a figure which shows the structure of the waste water treatment system which concerns on the 1st Embodiment of this invention. (A) is a perspective view which shows a part of case body, (b) is the figure which made peat moss into a bag. It is a figure which shows the structure of the waste water treatment system which concerns on the 2nd Embodiment of this invention. It is a flowchart explaining the operation | movement which concerns on the pump control apparatus of the waste water treatment system of FIG. It is a figure which shows the change of pH value of the treated water processed with the waste water treatment system of this invention for about 3 days.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Storage tank, 2 Side groove, 3 Drainage, 4 Case body, 5 Pete moss layer, 7 Lower part in upstream storage chamber A, 8, 11 Communication piping, 9, 12 Partition plate, 13 Processed in downstream storage chamber C Water, 15 Circulation pump, 16 Discharge pump, A, B, C Reservoir, 100 Wastewater treatment system

Claims (8)

A concrete base installed on the ground with groundwater, a side gutter formed along the outer periphery of the concrete base and close to the ground and receiving drainage from the concrete base, and discharged from the side gutter An oil / water separator that receives wastewater, separates oil / water and discharges it to the ground, and a wastewater treatment system comprising:
A storage tank that introduces drainage from the side groove and passes through the interior and then discharges it to the ground, and a pH value in the drainage when the drainage from the side groove is passed through the storage tank. And a peat moss layer.   The storage tank has a plurality of storage chambers arranged from upstream to downstream and partitioned by a partition plate, and the peat moss layer is disposed at least in the uppermost storage chamber, adjacent to the lower portion of the upstream storage chamber, The waste water treatment system according to claim 1, further comprising a communication pipe having an end opening facing each of an upper portion of the downstream storage chamber.   The waste water treatment system according to claim 1 or 2, wherein the peat moss layer is accommodated in a case having a mesh shape or a plurality of holes.   The waste water treatment system according to claim 1, 2 or 3, wherein the peat moss layer is distributed and stored in a mesh bag, and a plurality of the mesh bags are stored in the case body.   The drainage treatment system according to any one of claims 1 to 4, wherein the groundwater of the ground has a pH value exceeding 7.   A configuration comprising: a circulation pump that circulates treated water in the downstream storage chamber into the uppermost storage chamber; and a discharge pump that discharges treated water in the downstream storage chamber, and constantly drives the circulation pump. The wastewater treatment system according to claim 1, wherein   A pH meter that measures a pH value in the downstream storage chamber; and a pump control device that drives and controls the circulation pump and the discharge pump based on the pH value measured by the pH meter, the pump control device comprising: When the pH value measured by the pH meter is within the range of the reference value, the circulation pump is stopped and the discharge pump is driven, and when the pH value is outside the range of the reference value, the circulation The wastewater treatment system according to claim 1, wherein a pump is driven to stop the discharge pump.   A water level meter for detecting the water level of the treated water in the downstream storage chamber, and the pump control device, when detecting that the water level has become a predetermined value or less by the water level meter, The wastewater treatment system according to claim 6, wherein the wastewater treatment system is stopped.

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