JP2000000591A - Method for purifying sewage of sewerage or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for purifying sewage of sewerage or the like so as to still more effectively achieve sewage purifying effect. SOLUTION: In a method for purifying sewage of sewerage or the like constituted so as to pass microorganisms effective for purifying sewage through a sedimentation basin 15, a part of microorganisms in the sedimentation basin 15 are returned to the stage before an equipment including a sand sedimentation basin 3. Further, oxygen is supplied on the way of the return of effective microorganisms and the effective microorganisms are may be returned through an equipment piping or in the vicinity of the outside thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the purification of sewage by, for example, returning some of the effective microorganisms that have flowed into a final sedimentation basin in a sewage treatment plant to a stage preceding the sedimentation basin for input and utilization. And a method for purifying sewage such as sewage.

[0002]

2. Description of the Related Art For example, in a sewage treatment system, as shown in FIG. 6, rainwater or domestic wastewater flows into a water extraction station (pump station) through a pipe, and sewage from the water extraction station flows through a pipe (inflow channel) 1. The dust flows into the sand basin 3, where relatively large dust is removed by the dust remover 5 and the sand is settled. The sewage from the settling basin 3 is guided to the next preliminary reaction tank (preliminary aeration tank) 9 → the first settling basin 11 → the reaction tank (aeration tank) 13 via the inflow water tank 7, and is introduced into the reaction tank 13. Purification treatment is performed by activated sludge containing microorganisms, air supply, and stirring. The sewage is then sent to the final sedimentation basin 15 where purification of the sewage is carried out by microorganisms guided together with the sewage from the reaction tank 13. Since the microorganisms contributing to the purification remain as effective microorganisms, a part of them is led to the concentration tank 17. At the same time, it is returned to the reaction tank 13 and supplied to contribute to purification. The description of the processing system after the aeration tank 17 is omitted here.

[0003]

The effective microorganisms in the final sedimentation basin 15 are only returned to the reaction tank 13 one stage before the sedimentation basin 15 so far, so that the purification effect of the sewage is generally improved. It was not effective one by one, and the countermeasure was desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a method for purifying sewage and other sewage in which sewage is more effectively purified.

[0005]

Means for Solving the Problems In order to finely solve the above problems, the invention according to claim 1 is directed to a method for purifying sewage such as sewage in which effective microorganisms for purifying sewage pass through a sedimentation pond. It is characterized in that a part of the microorganisms in the pond is returned to a stage before the equipment including the sand basin.

According to a second aspect of the present invention, in the first aspect, oxygen is supplied while returning the effective microorganisms.

[0007] The invention described in claim 3 is claim 1 or 2.
In the above, the effective microorganisms are returned through the inside or outside of the facility piping.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows a preferred embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an inflow channel, 3 denotes a sand basin, and a gate 4 is provided in the sand basin 3 so as to be able to move up and down. . Reference numeral 5 denotes a dust remover, of which type is a conveyer scooping type or the like. Reference numeral 7 denotes an inflow water tank, into which sewage from the sand basin 3 flows, and the water tank 7 has a gate 8. 9 is a preliminary reaction tank (preliminary aeration tank), 11 is a first settling tank, and 13 is a reaction tank (aeration tank).

Reference numeral 15 denotes a final sedimentation basin, and 17 denotes a concentration tank.
The final sedimentation basin 15 is provided with a pit 16 so as to send a part of the effective microorganisms to a concentration tank 17 as shown by an arrow A. By the way, in this embodiment, the effective microorganisms remaining in the pit 16 are returned to the preceding stage of the inflow channel 1 and introduced together with the sludge as shown by the arrow B. An air (or oxygen) supply means 21 is provided on the return path 20 in order to return the effective microorganisms in an active state. The stirring means may be configured at the same time. The return pump is not shown.

[0010] Note that the like a virtual line arrow _{B 1} gate 4
It may be returned after or before. Further, it may be returned from the settling basin 3 as a virtual line arrow B ₂ in front or rear position near the gate in the flow path between the inflow water tank 5. All of these arrows B, B ₁ , and B ₂ , or a combination of two or more of them, or alternatively, may be implemented. The return to the reaction tank 13 may be performed at the same time as indicated by a virtual arrow C. The range of the new return in this embodiment is a range indicated by an arrow X in FIG. 1, the rear is in front of the inflow water tank 7, and the front is not specified.

Reference numeral 23 denotes an air introduction means, and
To promote air purification by introducing air into the
Reference numeral 4 denotes a new microorganism (seed fungus) supply means, which is newly introduced into the inflow channel 1. Further, the effective microorganisms from the reaction tank 13 may be returned through the above-described route. The novel microorganism supply means 24 may be capable of supplying microorganisms of the genus Paillus which frequently inhabit human waste and the like.

FIG. 2 shows the final sedimentation basin 15 viewed from above. Sludge discharge pipes 26 are respectively taken out of the plurality of sedimentation basins 15 and connected to return pipes 28 via switching valves 27. On the other hand, a sludge introduction pipe 29 to the concentration tank 17 is connected via the valve 27. Switching valve 27
Is for switching the sludge flow in the direction of the return pipe 28 and the direction of the sludge introduction pipe 29.

FIG. 3 shows another return method in which sludge mixed with effective microorganisms from a sedimentation tank is returned to a manhole 31 through a return pipe 32. The return pipe 32 in this case passes through the pipe 33 from the manhole 31, as shown by the solid line in FIG. 3 and the solid line in FIG. The return pipe 2 may pass through the outside of the pipe 33 as shown by a virtual line in FIG.

The inflow pipe 36 to the water treatment facility 35 is
In addition to the straight one, as shown in the plan view of FIG. 5, there is a detoured one. In this case, the return pipe 37 can be connected through a relatively short distance due to the detour.

The sludge flowing into the water treatment facility or the pipe at the preceding stage is charged with + or-ions, and when the sludge flows into a sedimentation basin or the like, it is adsorbed by a magnet and immediately settles. May be promoted.
In this case, an ultrasonic vibration may be applied in addition to the electromagnetic attraction by the magnet. This ultrasonic vibration is performed after or before the action by the magnet or simultaneously with the action by the magnet.

In the water treatment equipment as in the above embodiment,
The method of producing calcined charcoal for general use and other purposes will be described here as an additional example. That is, the materials used as raw materials are grasses such as weeds, sunflowers and lotus roots, stems such as hinoki and kenaf, stems, leaves, leaves and stems of magnetic mugwort,
These are selected as desired, formed into fine chips, mixed with mud (sludge may be used) or sand, etc. (sometimes sawdust is mixed at the same time) so as to have an appropriate viscosity, and then passed through a molding machine. .

The molding machine is provided with a number of parallel throttle holes in the body, and inserts a pushing means from the rear of the hole to sequentially extrude the viscous agent to the front of the hole like an incense stick. The molded article thus obtained is cut into pieces (there is no need to cut the pieces) and then steamed (smoked). Activated carbon having an innumerable number of ultrafine pores can be effectively produced by steaming. These products are used for water and air purification. Incidentally, stone materials such as barley stone may be mixed in the middle.

FIG. 7 shows an example of an additional proposal. In this example, in consideration of the fact that the pipe 51 connecting between the manholes 50... The pipes are forcibly removed for protection of piping. That is, C is a fresh air feeding side, and D is an internal gas outlet side. On the fresh air feeding side C, a first house 52 is erected on the manhole 50 and has a structure in which air can be freely taken. Means 53 for neutralizing and passing an external gas in the first house 52;
A first fan 54 for sucking and discharging the neutralized component is provided. On the discharge side of the first fan 54, a first carrier 55 is set, in which a mold removing biomaterial or the like is loaded. According to these, the outside air is sucked and discharged while being neutralized and mold-removed by driving the first fan 54, and is guided from the manhole 50 into the pipe 51.

On the other hand, a similar second house 60 is also provided upright on the internal gas outlet side D to suck and remove the air fed in with the internal gas. That is, 6
Reference numeral 1 denotes a second carrier impregnated with activated carbon, and 62 denotes an exhaust fan.

The suction / exhaust system of the first fan 54 and the like may be configured in place of the second fan 56 and the like shown by phantom lines. The same applies to the internal gas outlet side D. Further, when the manholes 50 and 50 are considerably apart from each other, a provisionally buried hole 63 may be provided as shown by a virtual line to cope with exhaust. Furthermore, manholes 50 and 5
For manholes other than 0, a valve mechanism (apparatus) that unilaterally restricts in the exit direction may be set.

[0021]

According to the present invention, there is provided a method for purifying sewage or the like in which effective microorganisms for purifying sewage are passed through a sedimentation basin as described above, wherein a part of the microorganisms in the sedimentation basin includes a sand basin. Since it is configured to return to an earlier stage, it is possible to provide a method of purifying sewage such as sewage, in which the effect of purifying sewage is more effectively performed.

[Brief description of the drawings]

FIG. 1 is a schematic view of a water treatment facility according to an embodiment of the present invention.

FIG. 2 is an explanatory plan view showing a method of returning sludge from a plurality of sedimentation basins and introducing sludge into an aeration tank.

FIG. 3 is a schematic vertical sectional view showing a method of bringing returned sludge into a manhole.

FIG. 4 is a schematic sectional view of FIG. 3;

FIG. 5 is a plan view showing an example of returning sludge to a sewage introduction path by a bypass pipe.

FIG. 6 is a schematic diagram showing a conventional water treatment system.

FIG. 7 is a schematic view showing a plan for extracting gas in a pipe between manholes.

[Explanation of symbols]

1 ... piping (inflow water channel) 3 ... sand basin 5 ... dust remover 7 ...
Inflow channel 9… Preliminary reaction tank (preliminary aeration tank) 11…
First settling basin 13 ... Reaction tank (aeration tank) 15 ... First settling basin 17 ... Concentration tank

Claims (3)

[Claims] 1. A method for purifying sewage or other sewage in which effective microorganisms for purifying sewage are passed through a sedimentation basin.
A method for purifying sewage or other sewage, characterized in that a part of the microorganisms in the sedimentation basin is returned to a stage before the equipment including the sand basin. 2. The method for purifying sewage such as sewage according to claim 1, wherein oxygen is supplied during the return of the effective microorganisms. 3. The method for purifying sewage such as sewage according to claim 1, wherein the effective microorganisms are returned through the inside or outside of the facility piping.