JP3600947B2 - Operating method of wastewater treatment equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of operating a waste water treatment equipment, particularly, a method for the operation of waste water treatment equipment by possible membrane separation method relocation optionally relatively small.
[0002]
Problems to be solved by the prior art and the invention
Solid-liquid separation methods used in conventional wastewater treatment facilities are mainly gravity sedimentation methods, and it has been difficult to reduce the size of the facilities. Although a simple structure such as an unearthed pond that is relatively easy to install and remove is also known, relocation requires a considerable period of time and cost.
[0003]
On the other hand, the membrane separation method, which has been rapidly commercialized in recent years in the fields of sewage, human waste, and water purification, can perform solid-liquid separation in a relatively compact facility as compared with the gravity sedimentation method, and can save labor. is there. However, it has been difficult to say that the conventional wastewater treatment facilities that use the membrane separation method still make full use of the advantages of the membrane separation method.
[0004]
The present invention is to fully utilize the advantages of membrane separation method, with miniaturized, and its object is to provide a wastewater treatment equipment operating method capable to cope with the relocation.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a method of operating a wastewater treatment apparatus according to the present invention is directed to a wastewater treatment method in which raw water flows into a treatment tank for purifying sewage and the treated water in the treatment tank is discharged through a membrane separation device. In the operation method of the apparatus, when the inflow amount of raw water is the planned water amount of the wastewater treatment apparatus, a predetermined amount of raw water flows into the treatment tank from the raw water inflow path, and the treated water in the treatment tank is stirred by the treated water stirring means. When the treated water in the treatment tank is discharged from the treated water discharge path through the membrane separation device and the aeration operation by the aeration path is performed at predetermined intervals, and when the inflow amount of the raw water is smaller than the planned water amount, It is characterized in that excess sludge is extracted from the sludge discharge route .
[0006]
Further, another operation method of the wastewater treatment apparatus of the present invention is an operation method of a wastewater treatment apparatus in which raw water flows into a treatment tank for purifying sewage and the treated water in the treatment tank is discharged through a membrane separation device. In the method, the treatment tank is divided into a first treatment tank and a second treatment tank, and when the inflow of raw water is the planned water amount of the wastewater treatment apparatus, a predetermined amount of raw water flows into both treatment tanks from the raw water inflow path. while stirring the treated water in each processing tank respectively by the first and second treated water stirring means, discharging the first and second from the treated water discharge path via a membrane separation device in each processing tank treated water, respectively The aeration operation by the first and second aeration paths is performed at predetermined intervals, and when the inflow of raw water is smaller than the planned water amount, the aeration operation is performed in one of the first processing tank and the second processing tank. performed at intervals, the other one of the processing tank It is characterized by pulling excess sludge from the sludge outlet path. Further, in the operation at the time of low water flow where the inflow of raw water is smaller than the planned water flow in both of the above operation methods, one of the membrane separation devices provided in the processing tank is pulled up on the water surface, and the pulled-up membrane is pulled up. The membrane can be washed by injecting the chemical in the chemical adjustment tank into the separation device .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a system diagram showing an example of a wastewater treatment apparatus according to the present invention. FIGS. 2 to 4 are explanatory diagrams of operation methods, respectively, and FIG. 5 is an explanatory diagram showing an example of a cleaning operation of a membrane separation device.
[0008]
First, as shown in FIG. 1, the wastewater treatment apparatus according to the present embodiment includes a raw water inflow path 11 through which raw water flows into a treatment tank 10, and discharges treated water in the treatment tank 10 via a membrane separation device 12. Treated water discharge path 13, treated water circulation path 14 as treated water stirring means for stirring treated water in treatment tank 10, aeration path 15 for introducing aerated air into treatment tank 10, And a sludge deriving route 16 for deriving sludge.
[0009]
The raw water inflow path 11 is connected to the raw water inflow path 1 via the screen 2, and the treated water discharge path 13 is provided with a post-processing device 3 such as an ultraviolet sterilizer. The sludge discharge route 16 is provided with a sludge storage tank 4. Excess sludge in the sludge storage tank 4 is dewatered by a sludge treatment facility 5 such as a vehicle-mounted mobile dewatering vehicle and transferred to a container 6 a. The residue from the screen 2 is also processed by the residue processor 7 and transferred to the container 6b. In addition, a pump (P) and a blower (B) are provided at necessary portions of each path.
[0010]
Further, the jetting portion 15a in the treatment tank 10 of the aeration path 15 is provided in the treatment water circulation path 14 by an injector method, and the aeration air is dispersed in the treatment water circulated by the treatment water circulation path 14. It is formed so as to squirt into 10. The installation position is set at a position where the membrane of the membrane separation device 12 can be washed with aerated air. The membrane separation device 12 and the ejection unit 15a are provided with a plurality of units in consideration of later-described membrane cleaning and the like. The treated water circulation path 14 is for agitating the treated water by suctioning and discharging the treated water in the tank by the pump 14P. Instead of this, a normal stirring device can be provided.
[0011]
Next, an operation method of the wastewater treatment apparatus having the above configuration will be described. First, FIG. 2 and FIG. 3 show the operation method when the inflow of raw water is the planned amount of water in the wastewater treatment apparatus. The wastewater is treated intermittently by aerating and aerobically aerobic. An example is shown.
[0012]
A predetermined amount of raw water flows into the processing tank 10 from the raw water inflow path 11, and the pump 14P of the processing water circulation path 14 operates to circulate the processing water in the processing tank 10 to stir the processing water in the tank. At the same time, the pump 13P of the treated water discharge path 13 is operated to discharge the treated water in the treatment tank 10 from the membrane separation device 12. Then, the aeration operation (aerobic operation) by the aeration path 15 shown in FIG. 2 and the non-aeration operation (anaerobic operation) shown in FIG. 3 are alternately performed. That is, the aerobic treatment and the anaerobic treatment of the drainage are alternately performed by intermittently operating the blower 15B of the aeration path 15 at predetermined intervals. In this operation method (intermittent aeration method), the nitrogen removal rate can be improved and the advanced water purification treatment can be performed by appropriately setting the time allocation between the aerobic operation and the anaerobic operation.
[0013]
Further, by alternately performing the aerobic operation and the anaerobic operation, it is possible to remove deposits (cake layer) on the membrane separation device 12 by aeration treatment during the aerobic operation, and to perform stable operation for a long period of time. be able to.
[0014]
The suction and discharge of the treatment water from the membrane separation device 12 is desirably performed intermittently, and is preferably stopped at a time ratio of about 1/5 to 1/10 during the operation time. Further, it is preferable that the permeation flow rate of the membrane is usually set in the range of 0.24 to 0.4 m per day.
[0015]
FIG. 4 shows an example of an operation state when the amount of water is smaller than the planned amount of water. The above-described intermittent aeration method is performed in a state where a predetermined amount of the treated water in the treatment tank 10 is withdrawn from the treated water discharge path 13. While the inflow raw water is being processed, the pump 16 </ b> P is operated to extract the sludge concentrated at the bottom of the tank from the sludge discharge path 16. Thereby, since the excess sludge can be extracted in a concentrated state, the sludge can be easily treated.
[0016]
Further, in the membrane separation device 12, in order to guarantee the performance of the membrane, it is necessary to wash the membrane with a chemical solution at an appropriate time. For example, the membrane separation device 12 is operated by a low water flow operation method shown in FIG. Can be easily done when
[0017]
That is, as shown in FIG. 5, in the operation at the time of the low water amount shown in FIG. 4 described above, one unit of the membrane separation device 12 provided with a plurality of units is pulled up on the water surface, and The chemical solution in the chemical solution adjusting tank 31 is injected through the path 32 and the pump 32P, and the film is washed for a predetermined time, for example, about 1 hour. Thereafter, the membrane separation device 12 may be returned to the treated water to start discharging the treated water.
[0018]
As shown in the present embodiment, the wastewater treatment device does not require a sedimentation tank because solid-liquid separation is performed by a membrane separation device, so not only maintenance and management is easy, but also construction and removal can be performed quickly. The transfer can be easily performed. Further, by unitizing the membrane separation device and the aeration device, construction and removal can be performed quickly.
[0019]
Furthermore, the sludge generation amount can be reduced by the high concentration MLSS, and nitrogen can be removed by the intermittent aeration method. In addition, membrane cleaning can be performed on the spot with simple operations, and automation according to the amount of raw water inflow is also possible. In addition, the volume of excess sludge can be reduced by extracting the treated water to a certain extent through a membrane when extracting excess sludge, and by using an ultraviolet sterilizer as a post-treatment device, it is safe and sophisticated. The quality of treated water can be obtained.
[0020]
Further, in the present invention, a plurality of processing tanks as described above may be provided. For example, FIG. 6 shows a case where the inside of the treatment water tank 51 is partitioned by an overflow weir 52 to form a first treatment tank 60 and a second treatment tank 70. A first inflow path 61 and a second inflow path 71, a first drainage path 63 and a second drainage path 73 for discharging the processing water in the processing tanks 60 and 70 through the membrane separation devices 62 and 72, respectively; The first circulation path 64 and the second circulation path 74 for extracting the treated water in the tanks 60 and 70 and circulating the treated water in the respective treatment tanks 60 and 70 to agitate the treated water; A first introduction path 65 for introducing the treated water in one treatment tank into the other treatment tank using the path of the two circulation paths 74, a second introduction path 75 formed by the overflow weir 52, Aerating air is introduced into the processing tanks 60 and 70 As one aeration path 66 and the second aeration path 76, a first sludge passage 67 and the second sludge passage 77 to derive the sludge of the treatment tank 60 and 70 are provided, respectively.
[0021]
The first inflow path 61 and the second inflow path 71 are branched downstream of the screen 2 provided in the raw water inflow path 1, and the first and second drainage paths 63 and 73 are provided for post-processing such as an ultraviolet sterilizer. They meet at the entrance of the device 3. Further, the first sludge route 67 and the second sludge route 77 join at the entrance of the sludge storage tank 4, and the excess sludge in the sludge storage tank 4 is dehydrated by the sludge treatment equipment 5 and is converted into the container 6 a. The sewage from the screen 2 is also processed by the sewage processor 7 and transferred to the container 6b. In addition, a pump (P) and a valve are provided at necessary positions of each path, and a blower (B) is provided in each of the aeration paths 66 and 76. In addition, the spouting portions of both aeration paths 66 and 76 and their installation positions are formed in the same manner as described above, and thus detailed description is omitted.
[0022]
In such a two-tank type apparatus, as shown in FIG. 7, an operation method based on the intermittent aeration method similar to FIGS. 2 and 3 can be performed.
[0023]
That is, a predetermined amount of raw water flows into the first processing tank 60 and the second processing tank 70 from the first inflow path 61 and the second inflow path 71, respectively. The treated water in the treatment tanks 60 and 70 is circulated and stirred in the respective treatment layers, and the treated water in the treatment tanks from the first drain passage 63 and the second drain passage 73 is passed through the membrane separation devices 62 and 27. And discharge. Then, the aeration operation by the first aeration path 66 and the second aeration path 76 is performed intermittently in both the processing tanks 60 and 70.
[0024]
Note that FIG. 7 shows a state in which the processing tank 60 is performing an anaerobic operation and the processing tank 70 is performing an aerobic operation, and the valves 61V and 71V of the first and second inflow paths 61 and 71 and the first and second valves. The valves 64V and 74V of the two circulation paths 64 and 74 are open, respectively, and the pumps 63P and 73P of the first and second drain paths 63 and 73 and the pumps 64P and 74P of the first and second circulation paths 64 and 74 are operating. In the first and second aeration paths 66 and 76, the blower 76B of the second aeration path 76 is operating.
[0025]
As described above, by performing the anaerobic operation and the aerobic operation separately for the two treatment tanks 60 and 70 and performing the treatment by the intermittent aeration method, it is possible to perform the advanced water purification treatment as described above. In addition, you may make it the both processing tanks 60 and 70 perform an anaerobic operation or an aerobic operation simultaneously.
[0026]
FIG. 8 shows an example of an operation state when the amount of water is small in the above operation state. In one of the first treatment tank 60 and the second treatment tank 70, the drainage treatment is performed by the intermittent aeration method, and the other is performed. The processing tank is in a standby state.
[0027]
For example, when the first processing tank 60 is to be in a standby state, in the second processing tank 70, the raw water flows in from the second inflow path 71 and the second circulation path 74 circulates the processing water in the tank. The aeration by the second aeration path 76 is performed intermittently, and the above-mentioned intermittent aeration method of discharging the treated water in the second processing tank 70 from the second drainage path 73 through the membrane separation device 72 is performed.
[0028]
Then, in the first treatment tank 60, the treated water in the first treatment tank 60 is discharged to some extent from the first drainage passage 63 through the membrane separation device 62 to concentrate the sludge, and then the pump 67P of the first sludge passage 67 is concentrated. Is operated to pull out excess sludge in the tank or to perform maintenance work such as cleaning of the membrane separation device 62.
[0029]
FIG. 9 shows another operation method at the time of the planned water volume. An anaerobic operation is performed in one processing tank, for example, the first processing tank 60, and an aerobic operation is performed in the second processing tank 70 that is the other processing tank. In addition, an example is shown in which wastewater treatment is performed by a circulation method in which a part of the treatment water in the second treatment tank 70 is circulated to the first treatment tank 60.
[0030]
First, a predetermined amount of raw water flows from the first inflow path 61 into the first treatment tank 60 performing the anaerobic operation, and a part of the treated water derived from the second treatment tank 70 via the valve 74V is used. The pump 64P circulates and flows through the first introduction path 65, the valve 65V, and the first circulation path 64. At the same time, the treated water in the first treatment tank 60 is discharged from the membrane separation device 62 via the pump 63P and the first drainage channel 63.
[0031]
Further, the treated water in the first treatment tank 60 overflows into the overflow weir 52 (the second introduction path 75) and flows into the second treatment tank 70 that is performing the aerobic operation. As described above, a part of the treated water in the inside is circulated to the first treatment tank 60 via the first introduction path 65 and the first circulation path 64, and the remaining part is passed through the second circulation path 74 by the pump 74P. The water is circulated through the second processing tank 70 to stir the inside of the tank. At the same time, the aeration process is performed by the blower 76B in the second aeration path 76, and the treated water is discharged from the second drain path 73 and the pump 73P via the membrane separation device 72.
[0032]
In such wastewater treatment by the circulation method, since the nitrogen removal rate is determined by the circulation rate of the treated water from the second treatment tank 70 to the first treatment tank 60, it is not possible to expect a removal rate of a certain degree or more. Stable operation can be performed with a simple operation of setting the rate appropriately.
[0033]
The anaerobic operation in the first processing tank 60 and the aerobic operation in the second processing tank 70 are switched for an appropriate period, for example, every day, so that the membrane is separated by the aeration process during the aerobic operation. The deposits (cake layer) on the devices 62 and 72 can be removed.
[0034]
Therefore, the intermittent aeration method shown in FIG. 7 and this circulation method can be selected depending on the management level. If a stable operation state with a certain nitrogen removal rate is desired, the circulation method should be performed at a high nitrogen level. When removal is necessary, the above-mentioned intermittent aeration method may be adopted.
[0035]
【The invention's effect】
As described above, according to the waste water treatment equipment operating method of the present invention, is capable of a high degree of wastewater treatment with a simple apparatus configuration can be carried out construction and removal quickly.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an example of a wastewater treatment device of the present invention.
FIG. 2 is an explanatory diagram showing a state of aerobic operation at a planned water volume.
FIG. 3 is an explanatory diagram showing a state of anaerobic driving.
FIG. 4 is an explanatory diagram showing an operation state when the amount of water is low.
FIG. 5 is an explanatory diagram showing a state of the membrane separation device during cleaning.
FIG. 6 is a system diagram showing an example of a two-tank type wastewater treatment apparatus.
FIG. 7 is an explanatory diagram showing an example of an operation state of the two-tank type wastewater treatment apparatus at a planned water volume.
FIG. 8 is an explanatory diagram showing an operation state when the amount of water is low.
FIG. 9 is an explanatory diagram showing another operation state of the two-tank type wastewater treatment apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Raw water inflow path, 2 ... Screen, 3 ... Post-processing device, 4 ... Sludge storage tank, 5 ... Sludge treatment equipment, 7 ... Slag treatment equipment, 10 ... Treatment tank, 11 ... Raw water inflow path, 12 ... Membrane separation Apparatus, 13: treated water discharge path, 14: treated water circulation path, 15: aeration path, 16: sludge derivation path, 60, 70: first and second treatment tanks

Claims (3)

In a method of operating a wastewater treatment apparatus in which raw water flows into a treatment tank for purifying sewage wastewater and discharges treated water in the treatment tank through a membrane separation device, the amount of raw water flowing in the wastewater treatment apparatus is equal to the planned amount of water in the wastewater treatment apparatus. Sometimes, a predetermined amount of raw water flows into the treatment tank from the raw water inflow path, and the treated water in the treatment tank is stirred from the treated water discharge path through the membrane separation device while the treated water in the treatment tank is stirred by the treated water stirring means. A wastewater treatment device characterized by performing aeration operation by an aeration route at a predetermined interval and extracting excess sludge in a treatment tank from a sludge discharge route when an inflow amount of raw water is smaller than a planned water amount . Driving method . In a method for operating a wastewater treatment apparatus in which raw water flows into a treatment tank for purifying sewage wastewater and discharges treated water in the treatment tank through a membrane separation device, the treatment tank is provided with a first treatment tank and a second treatment tank. partitioned into the bath, when the inflow of raw water planning water waste water treatment apparatus, both treatment tank is allowed to flow respectively raw water of a predetermined amount from the water inlet path, each of the processing tank by the first and second treated water stirring means While each of the treated water is being stirred, the treated water is discharged from the first and second treated water discharge paths through the membrane separation device in each treatment tank, and the aeration operation by the first and second aeration paths is performed in a predetermined manner. Performed at intervals, when the inflow of raw water is smaller than the planned water volume, the aeration operation is performed at a predetermined interval in one of the first treatment tank and the second treatment tank, and excess sludge in one of the other treatment tanks is removed. It is particularly important to remove How the operation of the wastewater treatment device according to. In operation at a low water flow where the inflow of raw water is smaller than the planned water flow, one of the membrane separation devices provided in the treatment tank is pulled up on the water surface, and the chemical solution adjustment tank is placed in the pulled up membrane separation device. The method for operating a wastewater treatment apparatus according to claim 1, wherein the membrane is washed by injecting a chemical solution in the inside .

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