JP4871766B2 - Turbid water treatment equipment - Google Patents

Description

  The present invention relates to an apparatus for treating muddy water generated at a construction site or the like.

  In facilities where turbid water is generated such as construction sites and factories, the turbid water is purified and reused as construction water (see Patent Document 1 below), or the turbid water is purified and released into rivers, etc. (See Patent Document 2 below). In addition, there are strict standard values for the pH (pH) and turbidity of water discharged from construction sites, etc., and when water is discharged into rivers, the water must be discharged if the standard value is not met. I can't.

  Patent Document 1 includes a drainage tank for storing wastewater from a construction site, a muddy water purification device for purifying water pumped out from the drainage tank by a pump, a water supply tank for storing purified water, and the like. A circulation-type water supply / drainage system that uses water in a water tank as construction water is disclosed. In this system, in order to secure construction water, the water in the drainage tank is directly supplied into the water tank, or a part of the wastewater generated at the construction site is directly supplied to the water tank. When the wastewater is directly supplied into the water tank as described above, the water quality in the water tank is naturally deteriorated, but the system does not include means for purifying the water in the water tank.

  Moreover, in the turbid water treatment apparatus provided in the system disclosed in Patent Document 1, the pH and turbidity of purified water are measured, stored in the treatment water tank, and the water in the treatment water tank is pumped out by a pump. To the water tank. However, Patent Document 1 does not disclose how to improve water quality when the pH or turbidity of water after treatment deteriorates. Therefore, in the system disclosed in Patent Document 1, since the water in the water tank cannot be discharged to the outside, it is necessary to reuse all the water in the water tank.

  On the other hand, Patent Document 2 introduces a raw water tank for storing muddy water, a flocculant addition means for adding a flocculant to water pumped from the raw water tank by a raw water pump, and water to which the flocculant is added. There is disclosed a turbid water treatment apparatus that includes a sedimentation tank and water quality inspection means for inspecting the quality of water in the sedimentation tank, and discharges the supernatant water of the precipitation tank to the outside. In the muddy water treatment apparatus, the water quality in the sedimentation tank is monitored by the water quality inspection means during operation of the apparatus, and when the water quality in the sedimentation tank deteriorates from the reference value for a predetermined time or more, the apparatus is stopped, However, after checking and adjusting the device, the device is operated again. Thus, in the apparatus disclosed in Patent Document 2, the apparatus is stopped every time the monitored water quality deteriorates, and inspection and adjustment by an operator are necessary.

Moreover, in the apparatus disclosed in Patent Document 2, when the water quality in the sedimentation tank is deteriorated from the reference value for a predetermined time or more, the apparatus is stopped to prevent the water having poor water quality from being discharged to the outside. ing. However, in the apparatus disclosed in Patent Document 2, the supernatant water of the sedimentation tank is directly discharged to the outside, and the supernatant water is discharged even when deterioration of the water quality is detected by the water quality inspection means. Therefore, even if the apparatus is stopped thereafter, a little water having poor water quality is discharged to the outside.
JP 2002-143832 A Japanese Patent No. 2993372

  The present invention aims to improve a turbid water treatment apparatus, and more specifically, in order to eliminate the inconvenience, when purifying turbid water generated at a construction site or the like when water having a water quality outside a predetermined allowable range is generated. Even so, it is an object to provide a muddy water treatment apparatus capable of purifying water without requiring inspection and adjustment by workers. Another object of the present invention is to provide a muddy water treatment apparatus that can reliably prevent discharge to the outside when water having a water quality outside a predetermined allowable range is generated.

In order to achieve the above object, the turbid water treatment apparatus of the present invention comprises a raw water tank that receives turbid water, a treatment part that treats turbid water pumped out of the raw water tank, and water that has passed through the treatment part by means of water quality detection means. Water quality detection tank for detecting water quality, fresh water storage tank for receiving and storing water via the water quality detection tank, return means for returning water from the water quality detection tank to the processing unit, and operation control of the return means The water quality detection tank is configured to transfer the supernatant water to the fresh water storage tank by overflow, and the control means has a water quality detected by the water quality detection means outside a predetermined allowable range. In this case, the returning means is operated to stop the transfer of water from the water quality detection tank to the fresh water storage tank.

  According to the muddy water treatment apparatus of the present invention, when the water quality detected by the water quality detection means is out of the allowable range, the control means operates the return means to transfer the water quality detection tank to the fresh water storage tank. Stop the inflow of water. For this reason, even if the water quality in the water quality detection tank is not within the allowable range, water does not flow out from the water quality detection tank to the fresh water storage tank. The water quality is always within a predetermined tolerance. Therefore, when water is discharged from the fresh water storage tank to the neighboring river, the purified water can always be discharged. Moreover, even when using the water of the said fresh water storage tank for construction, since the purified water can always be used, the stable water quality can be maintained as construction water.

  Moreover, according to the muddy water treatment apparatus of this invention, since the water whose quality deteriorated is returned to the said process part by the said return means, it returns to a water quality detection tank in the state by which the water quality was improved by the said process part. If such a cycle is repeated, the quality of the water flowing into the water quality detection tank is improved, so that the water quality detected by the water quality detection means falls within an allowable range, the operation of the return means is stopped, and fresh water storage is performed. Purified water flows into the tank. As described above, the turbid water treatment apparatus of the present invention can maintain the apparatus by stopping the operation of the apparatus as in the conventional apparatus even if the water quality in the water quality detection tank deteriorates. The water quality can be automatically improved by the operation of the apparatus itself without requiring any treatment such as improvement of water quality by the worker. Therefore, the muddy water treatment apparatus of the present invention is very easy to perform maintenance work during normal operation without any abnormality in the apparatus.

  In addition, the said process part is comprised with the chemical | medical agent addition means which adds the chemical | medical agent containing a coagulant | flocculant to the turbid water pumped out from the said raw | natural water tank, and the coagulation sedimentation tank which accepts the turbid water to which the chemical | medical agent was added, and carries out precipitation separation of the suspended | floating matter. be able to. In this case, it is possible to return the water in the water quality detection tank directly to the coagulation sedimentation tank by the return means, but in order to promote sedimentation of suspended matter contained in the water returned from the water quality detection tank, It is better to add chemicals to the water returned from the water quality detection tank. Therefore, it is desirable that the return means is configured to return the water in the water quality detection tank to the coagulation sedimentation tank via the chemical addition means.

  Further, in the muddy water treatment apparatus of the present invention, the return means comprises a return pump for pumping water in the water quality detection tank, and a return flow path for returning the water pumped by the return pump to the processing section. In this case, the return pump is preferably configured such that the return flow rate is equal to or higher than the flow rate of water flowing into the water quality detection tank. According to the said structure, when the said return pump is operated, the water more than what flows in in the said water quality inspection tank will be returned, Therefore The flow of the water from the said water quality inspection tank to the said fresh water storage tank is stopped. Accordingly, water with deteriorated water quality does not flow into the fresh water storage tank, so that the water quality in the fresh water storage tank is always kept within a predetermined allowable range.

  Further, in the muddy water treatment apparatus of the present invention, it is provided with a fresh water flow path for transferring water from the water quality detection tank to the fresh water storage tank, and the return means adds the flocculant added to the water transferred from the water quality detection tank And a switching means for switching whether the water transferred from the water quality detection tank is returned to the return flow path or transferred to the fresh water flow path. The water quality detection tank may be connected to the return flow path side by the switching means when the water quality detected by the water quality detection means is outside a predetermined allowable range. Even in such a configuration, when the return means is activated, the flow of water from the water quality inspection tank to the fresh water storage tank is stopped. Water does not flow in, and the water quality in the fresh water storage tank is always kept within a predetermined allowable range.

  The muddy water treatment apparatus of the present invention comprises at least one of a discharge means for discharging the water in the fresh water storage tank to the outside and a fresh water pump for pumping out the water in the fresh water storage tank. The capacity of the fresh water storage tank is preferably larger than the capacity of the water quality detection tank. If the fresh water storage tank has a large capacity in this way, it continues even when the water quality in the water quality detection tank is out of a predetermined allowable range and there is no inflow of water from the water quality detection tank. Thus, the water in the fresh water storage tank can be discharged or the water in the fresh water storage tank can be reused. In addition, since the water quality in the detection tank is improved quickly by reducing the volume of the water quality detection tank, the supply of fresh water from the water quality detection tank to the fresh water storage tank is quickly returned to efficiently Fresh water can be stored in the storage tank.

Further, the turbid water treatment apparatus of the present invention, before Symbol water quality detection tank is transported on the supernatant water to fresh water reservoir by overflow. When the return means is provided with a return pump, the return means is provided with a water level detection means for detecting the water level of the water quality detection tank, and the control means detects the water level below the predetermined reference water level. When this happens, it is preferable to stop the operation of the return pump. According to this, even when the return pump is activated, the water level in the water quality detection tank does not become lower than the reference water level. Therefore, when the water quality in the water quality detection tank is improved and the return pump is stopped, the water level in the water quality detection tank is quickly recovered. Therefore, the supernatant water of the water quality detection tank can be quickly transferred to the fresh water storage tank after improving the water quality.

  In the turbid water treatment apparatus of the present invention, the control means may include a notification means for issuing an alarm when the water quality detected by the water quality detection means is outside the allowable range for a predetermined time continuously. preferable. When the water quality in the water quality detection tank falls outside the allowable range for a predetermined time, the quality of the water returned by the return means is not improved depending on the processing in the processing unit. When such a situation occurs, it is considered that an abnormality has occurred in the apparatus. In such a case, an alarm is issued by the notification means. Accordingly, the person who manages the device may inspect the device when an abnormality occurs in the device, and simply inspect the device if the water quality detected in the water quality detection tank deteriorates and the return means is activated. There is no need for maintenance.

  Next, an example of an embodiment of the muddy water treatment apparatus of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a block diagram showing the configuration of the muddy water treatment apparatus 1 of the first embodiment, FIG. 2 is a flowchart showing the operation of the muddy water treatment apparatus 1 of the first embodiment, and FIG. 3 is the muddy water treatment of the second embodiment. FIG. 4 is a flowchart showing the operation of the muddy water treatment apparatus 31 of the second embodiment, and FIG. 5 is a block diagram showing the arrangement of a modification of the muddy water treatment apparatus 1.

  The muddy water treatment apparatus 1 according to the first embodiment is an apparatus for treating muddy water generated at a dam construction site. Specifically, as shown in FIG. 1, a raw water tank 2 that receives muddy water, a chemical addition device 3 that adds a flocculant and a neutralizing agent to the raw water pumped from the raw water tank 2, and raw water to which a chemical has been added. Receiving the processing unit consisting of thickener 4 (coagulation sedimentation tank) for precipitating solids in the water, water quality detection tank 5 for receiving the supernatant water of thickener 4 and inspecting the water quality, and receiving overflow water of water quality detection tank 5 And a fresh water storage tank 6 for storing.

  The raw water tank 2 and the thickener 4 are connected by a raw water flow path 7, the thickener 4 and the water quality detection tank 5 are connected by a treated water flow path 8, and the water quality detection tank 5 and the fresh water storage tank 6 are connected by a fresh water flow path 9. Connected by. Moreover, in this embodiment, the return flow path 10 which connects the water quality detection tank 5 and the raw | natural water tank 2 is provided. The raw water flow path 7 is provided with a mixing / reactor 11 for mixing the flocculant and neutralizing agent supplied from the chemical addition device 3 with the raw water.

  The raw water tank 2 is a water tank that receives and stores muddy water generated in a dam body part, a muddy water generated in a batcher plant (not shown) that manufactures concrete used in the dam, and the like. In addition, the raw water tank 2 is provided with a raw water pump 12 that pumps the raw water in the raw water tank 2 and supplies it to the raw water flow path 7. The capacity of the raw water tank 2 is about 20 cubic meters in this embodiment.

  In this embodiment, the drug addition device 3 supplies a known flocculant or pH adjuster such as PAC (polyaluminum chloride) or carbon dioxide to the raw water flow path 7. The mixing / reactor 11 has the same configuration as that conventionally used, and the raw water transferred from the raw water tank 2 to the thickener 4 and the flocculant are mixed together. It is configured to cause a chemical reaction sufficiently to ensure that contained impurities are aggregated and precipitated.

  The thickener 4 includes a screw conveyor 13 at the bottom. The slurry precipitated on the bottom of the thickener 4 is conveyed to one end of the bottom surface of the thickener 4 by the screw conveyor 13 and transferred to a filter press or the like (not shown) by a suction pump 14 connected to the one end. Further, a supernatant outlet 15 for allowing the supernatant water to flow into the treated water flow path 8 is provided at the upper part of the thickener 4. The processing capacity of the thickener 4 is 30 t per hour in this embodiment.

  The water quality detection tank 5 includes a turbidimeter 16 for measuring the turbidity of internal water, a pH meter 17 for measuring the pH of the water, a float switch 18 for emitting a signal when the water level falls below the reference water level, A return pump 19 for returning the internal water to the raw water tank 2 and a stirring screw 20 for stirring the internal water are provided. Note that a water level gauge may be used instead of the float switch 18. Further, a supernatant outlet 21 through which the supernatant water flows out is provided at the upper part of the water quality detection tank 5. The capacity of the water quality detection tank 5 is 8 cubic meters in this embodiment. The water pumped out by the return pump 19 is returned to the raw water tank 2 through the return flow path 10. Further, the flow rate of the return pump 19 is slightly larger than the flow rate of the raw water pump 12 in this embodiment.

  The fresh water storage tank 6 is provided with a fresh water pump 22 that pumps the internal water as construction water. In addition, a discharge port 23 for discharging the supernatant water to a neighboring river is provided in the upper part of the fresh water storage tank 6. The capacity of the fresh water storage tank 6 is 20 cubic meters in this embodiment.

  In addition, at the site where the muddy water treatment apparatus 1 is installed, an alarm system 24 (notification means) for reporting audio information to the mobile phone of the site supervisor is provided.

In this embodiment, the controller 25 shown in FIG. 1 is provided as a control means.
The controller 25 is electrically connected to each facility of the raw water pump 12, the drug addition device 3, the screw conveyor 13, the drawing pump 14, the stirring screw 20, the return pump 19, the fresh water pump 22, and the alarm system 24. Further, a turbidity meter 16, a pH meter 17, and a float switch 18 provided in the water quality detection tank 5 are connected to the controller 25.

  The controller 25 is formed by an electronic circuit or the like, and provides an output signal to each facility (excluding the return pump 19) based on an input signal from an operation panel (not shown), as well as a turbidimeter 16, a pH meter 17, a float. An output signal is provided to the return pump 19 based on an input signal from each measuring instrument such as the switch 18. In addition, a function of giving an output signal to the alarm system 24 based on an input signal regarding the operation status of the return pump 19 is also added. Further, a function of giving an output signal to the alarm system 24 based on an input signal regarding the operation status of each facility is added.

  Next, the operation of the muddy water treatment apparatus 1 according to the first embodiment will be described with reference to FIG. The muddy water generated from the dam body and the batcher plant at the dam construction site is first stored in the raw water tank 2. When an operation switch (not shown) of the muddy water treatment device 1 is turned on by an operator, the controller 25 activates each device such as the raw water pump 12, the chemical addition device 3, and the screw conveyor 13 to start muddy water treatment ( S1).

  The muddy water stored in the raw water tank 2 is pumped into the raw water flow path 7 by the raw water pump 12. Then, while being transferred through the raw water flow path 7, a chemical comprising a flocculant and a neutralizing agent is added from the chemical addition device 3 (S 2), and the raw water and the chemical are mixed in the mixing / reactor 11. The chemical reaction is performed.

  Next, the raw water to which the chemical is added flows into the thickener 4 from the raw water flow path 7, and the solid content in the raw water aggregates and settles in the thickener 4 and is separated into supernatant water and slurry (S3). Then, the overflow of the supernatant water flows from the supernatant outlet 15 into the water quality detection tank 5 through the treated water flow path 8 (S4). On the other hand, the slurry is transferred by a suction pump 14 to a filter press or the like provided on the downstream side.

  The water that has flowed into the water quality detection tank 5 is stirred by the stirring screw 20 so that the water quality in the tank is kept homogeneous, and the SS (floating substance amount) is indirectly measured by the turbidimeter 16, and a pH meter is measured. The pH is measured according to 17 (S5). The flocculant and neutralizing agent added by the chemical addition device 3 are adjusted so that the standard raw water at the construction site has a water quality within a predetermined allowable range (for example, SS 25 ppm or less, pH 6.5 to 5.8). ing. Accordingly, the water quality detected by the water quality detection tank 5 is within the allowable range unless the quality of the raw water changes or the apparatus has a failure. Thus, when the water quality detected in the water quality detection tank 5 is within the allowable range (YES in S6), the controller 25 does not operate the return pump 19. In addition, since the return pump 19 is not operating at this time (YES in S7), a stop signal for the return pump 19 is not transmitted.

  In this way, when the return pump 19 is not operating, the overflow water in the water quality detection tank 5 flows into the fresh water storage tank 6 from the supernatant outlet 21 via the fresh water flow path 9, and the water quality is within an allowable range. The water inside is stored in this fresh water storage tank 6. And the said process is performed until a muddy water process is complete | finished (it is NO at S8). The water stored in the fresh water storage tank 6 is transferred to the construction site by the controller 25 operating the fresh water pump 22 as necessary, and reused at the construction site. Further, when the water level of the fresh water storage tank 6 reaches the height of the outlet 23, water is discharged from the outlet 23 to the neighboring river.

  Here, the case where there is a temporary change in water quality in the raw water will be described. At construction sites, the type of work, such as excavation and concrete placement, changes every moment, and there are many unforeseen circumstances such as the occurrence of spring water, and the quality of the raw water introduced into the raw water tank 2 changes temporarily. There are many things to do. In such a case, the quality of the water introduced from the thickener 4 into the water quality detection tank 5 may be outside the allowable range. Thus, when the value detected by the pH meter 17 or the turbidimeter 16 in the water quality detection tank 5 exceeds the allowable range (NO in S6), the controller 25 uses the signal from the float switch 18 to detect the water quality detection tank. It is determined whether the water level of 5 is equal to or higher than a predetermined water level (S10). If the water level in the water quality detection tank 5 is equal to or higher than the predetermined water level (YES in S10), the controller 25 activates the return pump 19 (S11).

  When the return pump 19 is activated, the flow rate by the return pump 19 is slightly larger than the flow rate by the raw water pump 12, so the water level in the water quality detection tank 5 immediately drops and the outflow of water from the supernatant outlet 21 stops. . For this reason, water whose water quality has deteriorated is not transferred to the fresh water storage tank 6.

  Next, the controller 25 determines whether or not the water quality detected in the water quality detection tank 5 is continuously outside the allowable range for a predetermined time (for example, 3 minutes) (S12). If the condition outside the allowable range has not continued for a predetermined time (NO in S12), the processing from S2 to S6 in FIG. 2 is performed, and the water introduced from the thickener 4 through the treated water flow path 8 is in the water quality detection tank 5 Continue to monitor water quality.

  When the return pump 19 is activated, the water in the water quality detection tank 5 is returned to the raw water tank 2 through the return flow path 10 by the return pump 19. The water returned to the raw water tank 2 is mixed with the raw water in the raw water tank 2 and flows through the raw water flow path 7 by the raw water pump 12. In addition, a chemical is added in the raw water flow path 7, mixed with the chemical in the mixing / reactor 11, undergoes a chemical reaction, and is introduced into the thickener 4. Then, the solid content is separated in the thickener 4 and the supernatant water is introduced into the water quality detection tank 5 through the supernatant outlet 15 and the treated water flow path 8.

  As described above, when water returned from the water quality detection tank 5 by the return pump 19 is added to the raw water tank 2, the water quality in the raw water tank 2 is improved, so that the water is pumped out of the raw water tank 2 and mixed / reactor 11. And the water quality through the thickener 4 is gradually improved. If the water quality in the water quality detection tank 5 falls within the allowable range (YES in S6), the return pump 19 is not stopped (NO in S7), and the controller 25 stops the return pump 19 (S14). Thus, if the return pump 19 is stopped, the water level in the water quality detection tank 5 rises and the water overflows from the supernatant outlet 21, so that the overflow water passes through the fresh water flow path 9 and is in the fresh water storage tank 6. To be introduced.

  Here, since the flow rate of the return pump 19 is slightly larger than the flow rate of the raw water pump 12, the water level in the water quality detection tank 5 gradually decreases during the operation of the return pump 19. When the float switch 18 detects that the water level in the water quality detection tank 5 has become equal to or lower than the predetermined water level (NO in S10), the controller 25 stops the return pump 19 (NO in S7, S14). As described above, when the return pump 19 is stopped, the water level gradually rises because water flows into the water quality detection tank 5 from the thickener 4. If the water quality in the water quality detection tank 5 is outside the allowable range (NO in S6) and the water level in the water quality detection tank 5 exceeds the predetermined water level (YES in S10), the controller 25 operates the return pump 19 again. Is started (S11).

  If the water quality detected in the water quality detection tank 5 is outside the allowable range for a predetermined time (YES in S12), the controller 25 activates the alarm system 24 and sends voice information to the mobile phone of the site supervisor. Is reported (S13). The voice information is, for example, a voice message such as “The turbid water treatment facility exceeded the discharge standard and the return pump was activated”. For example, the priority of reporting is to (1) the main mobile phone, (2) the secondary mobile phone, and (3) the fixed telephone at the field office for those who manage the operation of the muddy water treatment device 1. It can be in order. As described above, by registering a plurality of contacts in advance, it is possible to reliably report an abnormality.

  If the water quality detected in the water quality detection tank 5 is out of the permissible range for a predetermined period of time, it is possible that the chemical addition device 3 or the thickener 4 or the like has malfunctioned or the quality of muddy water has changed extremely. In the form, in such a case, by notifying a worker or an on-site supervisor at the site, the apparatus is inspected and maintained, and the setting of the addition amount of the flocculant or neutralizing agent is changed.

  When the operator turns off an operation switch (not shown) while the turbid water treatment apparatus 1 is continuously operated (YES in S8), the controller 25 stops each device such as the raw water pump 12 (S9). The operation of the processing device 1 is stopped.

In the first embodiment, an openable and closable gate is provided in the supernatant outlet 21 and the fresh water flow path 9 of the water quality detection tank 5, and when the water quality is outside the allowable range, the return pump 19 is operated. The gate may be closed. According to this, it can prevent more reliably that the water of the quality outside a tolerance is transferred from the water quality detection tank 5 to the fresh water storage tank 6 .

  Next, the muddy water treatment apparatus 31 according to the second embodiment of the present invention will be described with reference to FIGS. 3 and 4. In the muddy water treatment apparatus 31 of the present embodiment, the water quality detection tank 5 is located higher than the raw water tank 2 and the fresh water storage tank 6, and the return pump 19 used in the first embodiment is not provided. Further, as shown in FIG. 3, a switching valve 32 (switching means) is provided for switching whether the overflow water from the water quality detection tank 5 flows into the fresh water flow path 9 or the return flow path 10. The switching valve 32 is an electric switching valve and is switched by the controller 25. Since other configurations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and detailed description thereof is omitted.

  Next, the operation of the muddy water treatment apparatus 31 of the second embodiment will be described with reference to FIG. In the turbid water treatment apparatus 31 of the present embodiment, when the turbid water treatment is started (S21), the drug consisting of the flocculant and the neutralizing agent is added to the raw water by the drug addition apparatus 3 (S21). In S22), aggregation / precipitation processing is performed in the thickener 4 (S23). Moreover, the supernatant water of the thickener 4 flows into the water quality detection tank 5 (S24), and the water quality of the flowed-in water is detected (S25).

  When the water quality detected in the water quality detection tank 5 is within the allowable range (YES in S26), the controller 25 detects whether the switching valve 32 is on the fresh water flow path 9 side, and if it is on the fresh water flow path 9 side (S27). If YES, the switching valve 32 is held on the fresh water flow path side 9 and if it is the return flow path 10 side (NO in S27), the switching valve 32 is switched to the fresh water flow path 9 side (S33). Thereby, the overflow water from the water quality detection tank 5 flows into the fresh water storage tank 6.

  On the other hand, when the water quality detected in the water quality detection tank 5 falls outside the allowable range (NO in S26), the controller 25 sets the switching valve 32 so that water flows to the return flow path 10 side (S30). Then, it is determined whether or not a predetermined time has elapsed since the switching valve 32 is set to the return flow path 10 side, that is, whether or not the water quality detected in the water quality detection tank 5 is continuously outside the allowable range for a predetermined time (S31). ) If the condition outside the allowable range does not continue for a predetermined time (NO in S31), the processing from S22 to S26 is performed, and the water quality in the water quality detection tank 5 for the water introduced from the thickener 4 through the treated water flow path 8 Continue monitoring.

  Thereby, since the water with poor water quality is not supplied to the fresh water storage tank 6 and returned to the raw water tank 2, the water quality in the fresh water storage tank 6 is maintained in a good state. The water returned to the raw water tank 2 is mixed with the raw water in the raw water tank 2, added with a flocculant, etc., becomes supernatant water by the thickener 4, and is returned to the water quality detection tank 5 again. When the water quality is within the allowable range in the water quality detection tank 5 (YES in S26), the controller 25 switches the switching valve 32 to the fresh water flow path 9 side again (NO in S27, S33), and the water quality detection tank 5 The supernatant water is poured into the fresh water storage tank 6.

  In addition, when the water quality detected in the water quality detection tank 5 is outside the allowable range for a predetermined time (YES in S31), the controller 25 activates the alarm system 24 and sends voice information to the mobile phone of the site supervisor. Report (S32).

  According to the turbid water treatment apparatuses 1 and 31 of the first and second embodiments, when the water quality detected by the water quality detection tank 5 is out of the predetermined allowable range, the return pump as a return means by the controller 25. 19 and the switching valve 32 are operated, and the water in the water quality detection tank 5 is returned to the upstream side of the chemical addition device 3. In addition, due to the operation, the water quality of the water quality detection tank 5 falls within an allowable range if there is no failure in the apparatus.

  Therefore, according to the turbid water treatment apparatuses 1 and 31 of the first and second embodiments, even if the water quality in the water quality detection tank 5 is deteriorated, an operator or a field supervisor checks the apparatus one by one. Day-to-day maintenance is very easy. Further, since the water having deteriorated water quality does not flow into the fresh water storage tank 6 due to the operation of the return means, the water having the water quality within the allowable range is always discharged when the water is discharged from the fresh water storage tank 6 to the outside. It is released. Moreover, when using the water in the fresh water storage tank 6 as construction water, the water of the stable water quality can always be used. Moreover, since the capacity | capacitance of the fresh water storage tank 6 is larger than the capacity | capacitance of the water quality detection tank 5, when using the water in the fresh water storage tank 6 as construction water, the stable supply is attained.

  In the muddy water treatment apparatus 1 of the first embodiment, the flow rate of the return pump 19 is slightly larger than the flow rate of the raw water pump 12, but the flow rate of the return pump 19 is not limited to this. Any flow rate or higher is acceptable.

  In the muddy water treatment apparatus 31 of the second embodiment, the water quality detection tank 5 is provided at a position higher than the raw water tank 2 and the fresh water storage tank 6 so that water from the water quality detection tank 5 flows by gravity. However, the present invention is not limited to this, and a return pump is provided in the same manner as in the first embodiment, and the water from the water quality detection tank 5 is caused to flow into the fresh water storage tank 6 or returned to the raw water tank 2 by the switching valve 32. May be switched.

  Moreover, although the alarm system 24 in the muddy water treatment apparatus 1 and 31 of the said embodiment is made to report audio | voice information to a cell phone of a field supervisor, it is not restricted to this, A siren is sounded, or a field supervisor's You may make it transmit the electronic mail of the content similar to the above-mentioned audio | voice information to a mobile telephone or the personal computer of a field office.

  Moreover, in the muddy water treatment apparatus 1 and 31 of the said embodiment, although each apparatus which comprises the muddy water treatment apparatuses 1 and 31 is centrally controlled by the controller 25, for example, as shown in FIG. You may make it use only for control of the return pump 19 and the alarm system 24. FIG. In this case, the start of the turbid water treatment apparatus (S1, S21) and the stop of each device (S9, S29) in FIGS. 2 and 4 are not controlled by the controller 25, and the power of each device is turned on / off manually or remotely. This is done by turning it off.

  Moreover, in the muddy water processing apparatuses 1 and 31 of the said embodiment, although the process part which processes the muddy water pumped out from the raw | natural water tank 2 is comprised with the chemical | medical agent addition apparatus 3 and the thickener 4, it replaces with the thickener 4 and floats. It is also possible to provide a filtration tank for filtering water or to add a filtration tank between the thickener 4 and the water quality detection tank 5.

The block diagram which shows the structure of the muddy water processing apparatus 1 of 1st Embodiment. The flowchart which shows the action | operation of the muddy water processing apparatus 1 of 1st Embodiment. The block diagram which shows the structure of the muddy water processing apparatus 31 of 2nd Embodiment. The flowchart which shows the action | operation of the muddy water processing apparatus 31 of 2nd Embodiment. The block diagram which shows the structure of the modification of the muddy water processing apparatus 1. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Turbid water treatment apparatus, 2 ... Raw water tank, 3 ... Chemical addition apparatus (chemical addition means), 4 ... Thickener (coagulation sedimentation tank), 5 ... Water quality detection tank, 6 ... Fresh water storage tank, 10 ... Return flow path (return) Means), 16 ... Turbidimeter (water quality detection means), 17 ... pH meter (water quality detection means), 18 ... Float switch (water level detection means), 19 ... Return pump (return means), 25 ... Controller (control means) 32. Switching valve (return means).

Claims (7)

A raw water tank for receiving turbid water, a processing unit for processing turbid water pumped from the raw water tank, a water quality detection tank for receiving water via the processing unit and detecting water quality by a water quality detection means, and via the water quality detection tank A fresh water storage tank for receiving and storing water, a return means for returning the water in the water quality detection tank to the processing section, and a control means for controlling the operation of the return means,
The water quality detection tank is configured to transfer the supernatant water to the fresh water storage tank by overflow,
The control means operates the return means when the water quality detected by the water quality detection means is outside a predetermined allowable range, and stops the transfer of water from the water quality detection tank to the fresh water storage tank. A muddy water treatment device.   The processing unit is composed of a drug addition means for adding a drug containing a flocculant to the turbid water pumped out of the raw water tank, and a coagulation sedimentation tank that accepts the turbid water to which the drug is added and precipitates and separates suspended matter, The turbid water treatment apparatus according to claim 1, wherein the return means is configured to return the water in the water quality detection tank to the coagulation sedimentation tank via the chemical addition means. The return means consists of a return pump that pumps out the water in the water quality detection tank, and a return flow path that returns the water pumped out by the return pump to the processing unit.
The muddy water treatment apparatus according to claim 1 or 2, wherein the return pump is configured such that a return flow rate is equal to or higher than a flow rate of water flowing into the water quality detection tank. A fresh water flow path for transferring water from the water quality detection tank to the fresh water storage tank,
The return means returns the water transferred from the water quality detection tank to the processing unit, and returns the water transferred from the water quality detection tank to the return flow path or transfers it to the fresh water flow path. And switching means for switching between
The control means connects the water quality detection tank to the return flow path side by the switching means when the water quality detected by the water quality detection means is outside a predetermined allowable range. The muddy water treatment apparatus as described.   It comprises at least one of a discharge means for discharging the water in the fresh water storage tank to the outside and a fresh water pump for pumping out the water in the fresh water storage tank, and the capacity of the fresh water storage tank is the water quality detection The turbid water treatment apparatus according to any one of claims 1 to 4, wherein the turbid water treatment apparatus is larger than a capacity of the tank. The water quality detection chamber is provided with a water level detecting means for detecting a water level,
The turbid water treatment apparatus according to claim 3, wherein the control means stops the operation of the return pump when the water level detected by the water level detection means becomes equal to or lower than a predetermined reference water level.   The said control means is provided with the alerting | reporting means which issues a warning, when the water quality detected by the said water quality detection means is outside the said tolerance | permissible_range for a predetermined time continuously. The turbid water treatment apparatus according to item 1.

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