JPS635837Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for biologically nitrifying and denitrifying organic wastewater such as human waste.

In conventional biological nitrification and denitrification equipment using the nitrification liquid circulation method, the nitrification liquid in the nitrification tank is circulated to the denitrification tank by a mechanical circulation pump such as a centrifugal pump installed outside the tank. Since this circulation pump is used for long periods of continuous operation, it often breaks down. As a result, not only did a spare pump become necessary, but maintenance was also troublesome, and its power efficiency was also problematic.

The object of the present invention is to provide an effective device that can solve the problems of the conventional devices.

In other words, the present invention allows the nitrified liquid in the nitrification tank to be forcibly circulated to the denitrification section by sending the nitrogen gas generated in the denitrification section to the draft tube, or to force the liquid in the denitrification section to the nitrification section. A draft tube that communicates the denitrification section with the nitrification section forms a liquid transfer path, and the nitrogen gas generated in the denitrification section is collected and transferred to the draft tube. This is a biological nitrification and denitrification device equipped with a nitrogen gas supply mechanism including a blower for supplying nitrogen gas to the lower part.

The first embodiment of the present invention will be explained with reference to the drawings.
In the figure, a single treatment tank 11 is connected to partition walls 5 and 6.
The treatment tank 11 is partitioned into a denitrification section 8 and a nitrification section 9, and an L-shaped draft tube 3 is provided in the treatment tank 11 to communicate the upper part of the denitrification part 8 and the lower part of the nitrification part 9. It is installed by penetrating the wall 6. Further, a booster blower 1 is disposed outside the processing tank 11 to feed nitrogen gas generated in the denitrification section 8 to the lower part of the draft tube 3. Although not shown, the nitrification unit 9 is provided with an air supply mechanism for aeration processing.

In the figure, reference numeral 2 denotes a flow meter, 4 denotes a flow control valve, 7 denotes an exhaust port, and 10 denotes an inlet pipe.

Therefore, when the nitrogen gas above the denitrification section 8 is sucked into the booster blower 1, the pressure is increased, and then sent to the draft tube 3, the nitrifying liquid in the draft tube 3 contains bubbles and its apparent specific gravity becomes small. The liquid is pushed up by an amount corresponding to the difference in specific gravity with the outside liquid and flows into the denitrification section 8 from the upper part of the draft tube 3, and the nitrified liquid in the nitrification section 9 is sucked into the draft tube 3. Note that the liquid in the denitrification section 8 rises through the gap between the partition walls 5 and 6 and flows into the nitrification section 9.

In order to adjust the amount of water pumped by the draft tube 3, that is, the amount of nitrified liquid circulated, it is sufficient to adjust the opening degree of the flow rate control valve 4 while reading the indicated value of the flow meter 2 (the amount of water pumped is determined by the flow rate of nitrogen gas). ).

In this way, in the example shown in FIG. 1, the nitrifying liquid is forcibly circulated to the denitrification section 8 by the draft tube 3. Note that the reason why the partition walls 5 and 6 are provided is to prevent the circulated nitrifying liquid from being returned to the nitrifying section 9 by the short pass.

Next, the example in FIG. 2 is a case in which the liquid in the denitrification section 8 is forcibly transferred to the nitrification section 9, contrary to the example in FIG. It is designed to flow into the denitrification section 8 through the. In the figure, 13 and 14 are partition walls.

In addition, in the example in Fig. 1, the draft tube 3
Most of the nitrogen gas sent to the denitrification section 8
The remaining part passes through the gap between the partition walls 5 and 6 and enters the nitrification section 9 together with the liquid, and is discharged from the exhaust port 7 to the outside of the system. In addition, in the example shown in FIG. 2, nitrogen gas is directly released from the draft tube 3 to the nitrification section 9.
Most of it circulates from above the partition wall 13 to the denitrification section 8, and the remainder passes through the lower part of the partition wall 14 together with the liquid and is discharged out of the system as in the example in FIG. In addition,
In FIGS. 1 and 2, reference numeral 15 denotes an exhaust valve for extracting nitrogen from above the denitrification section 8 as desired.

In addition, in each of the above embodiments, the denitrification section and the nitrification section are
Although it is formed by providing a partition wall within a single processing tank, it goes without saying that each may be formed using separate processing tanks.

As described above, the device of the present invention is configured to circulate liquid through a draft tube using nitrogen gas instead of the conventional mechanical pump, and is extremely simple in structure. The draft tube used as a liquid pumping device has no driving parts, so there is no failure, and the power for pumping liquid is provided by the blower, so the power efficiency is high, and there are no moving parts in the processing tank, so maintenance is easy. This provides practical benefits such as:

[Brief explanation of the drawing]

FIG. 1 is a system explanatory diagram showing an embodiment of the present invention, and FIG. 2 is a system explanatory diagram showing another embodiment of the present invention. 1... Boost blower, 2... Flow meter, 3... Draft tube, 4... Flow rate control valve, 5, 6... Partition wall, 7... Exhaust port, 8... Denitrification section, 9... Nitrification Part, 10... feeding pipe, 11... processing tank, 12...
...Partition plate, 13, 14...Partition wall, 15...Exhaust valve.

Claims (1)

[Claims for Utility Model Registration] 1. In a biological nitrification and denitrification device using a nitrification liquid circulation system, which has a nitrification part and a denitrification part, a liquid transfer path is provided in a draft tube that communicates the denitrification part and the nitrification part. What is claimed is: 1. A biological nitrification and denitrification device comprising a nitrogen gas supply mechanism including a blower for collecting nitrogen gas generated in the denitrification section and delivering it to the lower part of the draft tube. 2. The apparatus according to claim 1, wherein the draft tube is arranged to suck the nitrified liquid in the nitrification section from below and discharge it to the denitrification section from above. 3. The denitrification section and the nitrification section are separated by a partition wall provided in a single treatment tank, and the gas phase sections of each are separated from each other by the partition wall. The device according to claim 2 of the utility model registration claim.