JPH02293093A - Sewage treating device by hollow-fiber membrane bundle - Google Patents

Abstract

PURPOSE:To prevent an increase in required power by allowing a liq. mixture contg. flocs treated by a biological treating tank to flow in an inclined pipe to separate solid and liq. CONSTITUTION:Solid matter is separated from raw org. sewage by a sand removing device 1 and a screen 2, and the sewage is introduced into a bioreactor 3 from an inflow pipe 4. The org. sewage is mixed with activated sludge in the bioreactor 3 to form a liq. mixture 5. Air is supplied into the bioreactor 3 from a diffuser pipe 6 at the bottom, hence the org. matter in the sewage introduced into the bioreactor 3 is adsorbed on an aerobic micro-organismic floc, oxidized and decomposed, and the sewage is purified. The treated water contg. activated sludge is sent to the inclined pipe 10 from an outflow pipe 8 by a pump 9. Consequently, the capacity is easily increased or decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention is a biological reaction treatment for aerobically or anaerobically biologically treating wastewater! The present invention relates to a sewage treatment device that combines a bioreactor (bioreactor) and a device for solid-liquid separation of the treated liquid mixture using a hollow fiber membrane bundle.

[Jubei's technology] The solid-liquid separation membranes used in Jubei's sewage treatment equipment are known to use flat membranes and tubular membranes. However, in the solid-liquid separation using the conventional membrane described above, i! There was a problem in that it was necessary to provide an iL flow, which increased the required power. Further, the conventional membrane described above requires ball cleaning or the like in order to peel off and remove the Del layer attached to the membrane surface, making it difficult to control the permeation flow rate.

In order to solve the above conventional problems, the present inventor'! ? For example, a bundle of hollow fiber membranes is freely housed in a mixed liquid that has been subjected to a biological reaction treatment, and the inside of the hollow fiber membrane is intermittently sucked to separate the mixed liquid into a permeated liquid and a concentrated liquid. At the same time,
Control the interval between suction and pause of the intermittent suction mentioned above,
We have developed a wastewater treatment method and device that controls the permeation flow rate.

[Problem B to be solved by the invention] The present invention has been made in order to promote the economical practical application of the sewage treatment equipment developed above, and its purpose is to have a compact overall structure. By this,
Processing capacity can be easily increased or decreased depending on the actual situation,
It is an object of the present invention to provide a sewage treatment device using a hollow fiber membrane bundle, which allows maintenance such as replacing and cleaning the hollow fiber membrane bundle while operating the device.

[Means for Solving the Problems] A sewage treatment device using a hollow fiber membrane bundle of the present invention includes a large number of inclined pipes that diagonally pass through a biological reaction treatment tank that biologically treats sewage aerobically or anaerobically. A hollow fiber membrane bundle is housed in the inclined tube, and a mixed solution containing 7 locks treated in the biological reaction treatment tank is flowed from the upper end to the lower end of the inclined tube, and the hollow fiber membrane bundle is The hollow fiber membrane can be freely removed from the upper end of the inclined tube. The present invention is characterized in that the lower end of the inclined tube is configured to be openable and closable, thereby making it possible to clean the inside of the inclined tube.

[Example 1] Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a sand removal device, and 2 is a screen, which removes solid matter such as earth and sand mixed into the raw wastewater.

3 is a variable capacity bioreactor (biological reaction processing MJ)
The stock solution is configured to flow in through the inflow W4. In this embodiment, the water flows down naturally, but it may be supplied by a pump (not shown) as appropriate. Note that if the raw solution is wastewater containing oil, such as kitchen wastewater, it is introduced into the bioreactor 3 after oil separation.

The inflow amount of the above-mentioned raw solution changes over time, so that the water level of the mixed liquid containing biological flocs in the bioreactor 3, that is, the activated sludge mixed liquid 5, fluctuates between up and down (HWL.LWL). It has become.

A waste air pipe 6 is disposed at the bottom of the bioreactor 3, and is configured to diffuse air sent from an aeration blower 7 into the liquid mixture 5. Reference numeral 8 denotes an outflow pipe, through which the mixed liquid 5 in the bioreactor 3 is discharged by a pump 9. The mixed liquid 5 discharged from the outflow pipe 8 is sent into the inclined pipe 10.

The inclined pipe 10 is arranged so as to cross the inside of the bioreactor 3 in a Kasuri pattern, both ends of which are exposed to the outside from the bioreactor 3, and the inlet for the mixed liquid 5 is located above. , the outlet is located at the bottom. Incidentally, the inclined pipe 10
may be configured in the shape of a honeycomb tube.

A discharge pipe 10a is attached to the lower outlet of the inclined gio so as to protrude inward, so as not to suck in the sediment deposited in the lower end of the inclined pipe 10. Discharge pipe 10
The concentrated liquid discharged from a is returned into the bioreactor 3 by the pump 11.

A large number of hollow fiber membranes 12 are housed within the tilting tube 10 . The hollow fiber Ili12 is made of, for example, a synthetic fiber made of polyethylene or the like with numerous holes of about 0.1 micron in size.
Made of f-fat diameter 0. It is a thread-like hollow tube of about 3 +a+e. The hollow fibers 11112 are not limited to those mentioned above, and may be any hollow fiber membranes that have been used or developed so far.

The upper end of the bundle of hollow fibers [I12] is fixed in an open state in the suction tube 13, as shown in an enlarged view in FIG. Note that the hollow fiber membrane 12 is designed to move freely within the inclined tube 10, and its lower end is closed. This hollow fiber membrane 12 may be folded back into a loop shape and both ends thereof may be fixed to the suction tube 13.

14 is a suction device such as a suction pump, and the above-mentioned suction W1
3 to bring the interior of the hollow fiber membrane 12 into a low pressure state i), solid content,
Only the liquid portion excluding microorganisms, viruses, etc. is transferred to the hollow fiber membrane 12.
Solid-liquid separation is performed by permeating the inside of the liquid.

Reference numeral 15 denotes an intermittent timer, and by appropriately setting the operation time and rest time of the suction device 14, the suction and rest times can be changed.

Next, the operation of the vc position of the above embodiment will be explained.

First, remove sand from the raw solution of organic sewage! 1) and screen 2 to separate solids such as sand and inflow IrI4
Introduced into bioreactor 3 from Bioreactor 3
The organic sewage introduced into the tank becomes an activated sludge mixture 5.

The water level WL of the activated sludge mixture 5 fluctuates up and down according to changes in the amount of inflow from the inflow W4 and the amount of outflow from the outflow ff8.

Since air is supplied into the bioreactor 3 from the dead air pipe 6 at the bottom, the rock solids in the wastewater that have flowed into the bioreactor 3 are adsorbed by the aerobic microorganisms 7 and further oxidized and decomposed to be purified. Ru.

Is the treated water containing activated sludge flowing out through Bomb 9? 8
The inclined pipe 1012 is sent from the inclined pipe 1012.

The mixed liquid that has flowed into the inclined IrI10 is transferred to the hollow fiber IA12.
suction through the minute holes of ly? 13, and the permeate is withdrawn as treated water.

The concentrated liquid that is not sucked by the hollow fiber membrane 12 is transferred to the bomb 11.
is returned to the bioreactor 3 from the discharge pipe 10a.

The suction device fil4 is operated intermittently by an intermittent timer 15 to control the flow rate of the permeate. The intermittent timer 15 is preferably controlled by a computer.

In general, the treatment of organic wastewater such as domestic wastewater is normally carried out continuously, but when the operations are repeated during the drying period, gel etc. adhere to the surface of the hollow fiber membrane 12, causing so-called eye irritation. In this case, stop the flow of the mixed liquid by using the valves 10b and 10c at both ends of the inclined tube 10, remove the cap 16 shown in FIG. 2, and remove the hollow fiber membrane. Replace 12. Moreover, by also removing the lower cap 17, the inside of the slope W10 can be cleaned. The liquid that has wandered out due to this cleaning accumulates in the reservoir tank 18, and is returned to the bioreactor 3 using one pump.

Although the above embodiment was explained using one or two treatments in an aerobic bioreactor, the present invention is not limited to this.
It may also be an anaerobic bioreactor. In this case, the bioreactor must be capped, and extraction and heating required.

[Advantages of the invention 1] Due to the overall compact structure, the processing capacity can be easily increased or decreased depending on the actual situation, and maintenance such as replacing and cleaning the hollow fiber membrane bundle is possible while the device is in operation. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the sewage treatment apparatus of the present invention, and FIG. 2 is a partially enlarged sectional view. DESCRIPTION OF SYMBOLS 1... Sand removal device, 2... Screen, 3... Bioreactor, 4... Inflow pipe, 5... Mixed liquid, 6...
・Decided trachea, 7... Aeration blower, 8... Discharge pipe, 9
Pump, 10 Inclined pipe, 10a Discharge pipe, 10b, 10c Valve, 11 Pump, 1
2... Hollow fiber membrane, 13... Suction tube, 14... Suction pump, 15... Intermittent timer, 16.17... Cap, 18... Reservoir, 19... Pump.

Claims (1)

[Claims] 1. A biological reaction treatment tank for aerobically or anaerobically biologically treating wastewater is provided with a large number of inclined pipes diagonally passing through it, and a hollow fiber membrane bundle is accommodated within the inclined pipes. A mixed solution containing flocs treated by the biological reaction treatment tank is flowed from the upper end of the inclined tube toward the lower end, and the interior of the hollow fiber membrane is brought into a low pressure state to allow the liquid portion of the mixed solution to permeate. A sewage treatment device using a hollow fiber membrane bundle characterized by solid-liquid separation. 2. The sewage treatment apparatus using a hollow fiber membrane bundle according to claim 1, wherein the hollow fiber membrane is housed in a manner that it can be freely taken out from the upper end of the inclined pipe. 3. The sewage treatment apparatus using a hollow fiber membrane bundle according to claim 1 or 2, wherein the lower end of the inclined pipe is configured to be openable and closable, thereby making it possible to clean the inside of the inclined pipe.