JP3100604B2 - Water type wastewater treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an over-water type sewage treatment apparatus suitable for purifying sewage in relatively shallow water bodies such as lakes and marshes having a water depth of, for example, about several tens cm to 2 m.

[Prior Art] Various methods have been known for purification of lakes, rivers, and rivers. The present applicant has filed a patent application filed on April 6, 1990 by enclosing a peripheral portion of a housing with a float. Providing a filter medium inside the housing, providing a draft tube penetrating the inside of the housing and the filter medium, floating the device in which the diffuser tube is inserted in the draft tube above the water surface, sending air from the diffuser tube to the draft tube, A technology for purifying water used by an air lift pump with a filter medium has been proposed.

[Problems to be Solved by the Invention] The above proposal is effective, but in a relatively shallow water area such as a lake or marsh, for example, about several tens cm to 2 m,
Sludge and the like may accumulate, and the sludge and the like may be wound up by the draft tube, and the purification action may be hindered.

An object of the present invention is to provide a water-based sewage treatment apparatus for preventing sludge from rolling up and purifying sewage in relatively shallow water bodies such as lakes and marshes.

Means for Solving the Problems According to the present invention, in a water-based sewage treatment apparatus for purifying sewage in a water area having a relatively shallow water depth, a cylinder placed on the water bottom and having an upper edge projecting above the water surface A central pipe is erected at the bottom of the container-shaped main body, the lower part of the central pipe is communicated with the outer periphery of the upper part of the main body by a plurality of inflow pipes arranged radially, and the main body is filled with a filter medium by providing a gap from the bottom. A plurality of through-holes are formed in the outer periphery of the main body in the gap portion, and an air diffuser is inserted into the central tube to a portion near the bottom.

The main body is provided with a plurality of screw jack-type support legs on the outer circumference of the cylinder, and a relatively large-diameter disk that can support the device on sludge is attached to the lower end of the jack. It is preferable that the upper handle can be adjusted up and down by operating the handwheel.

Further, it is preferable that the filter medium is constituted by, for example, densely assembling cylindrical main bodies obtained by removing the bottom of a container having the trade name of Yakult and removing them at random.

[Operation] In the above-mentioned overwater type sewage treatment apparatus, when air is supplied from the air diffuser, a plurality of air particles floating from the air diffuser pass through a plurality of inflow pipes radially arranged by an air lift pump action. Then, the sewage near the water surface is sucked into the central pipe, guided to the filter medium, purified, and discharged from the through-hole of the main body.

Therefore, without rolling up sludge on the bottom of the water,
Sewage can be purified.

Further, the aeration action is limited to only the oxygen supplied from the air diffuser, and no disturbance occurs. Therefore,
The SS trapping property, which is a characteristic of the cylindrical filter medium, is increased, and the formation of a biofilm is facilitated. Then, the waste retention time (STR) becomes long, and the organic matter is totally oxidized.

Further, by adjusting the air supply amount, the dissolved oxygen concentration can be kept low on average, the oxygen utilization efficiency can be increased, and the BOD treatment efficiency can be increased.

Then, oxygen is supplied to the water around the device, and the self-cleaning action of the environment is promoted.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 4, the main body 1 of the processing apparatus A is shown.
Is formed in a cylindrical container shape, and on the axis of the bottom 2,
A central tube or draft tube 5 slightly lower than the upper edge of the main body 1 is provided upright. The lower part of the draft tube 5 is provided on the outer surface of the main body 1 with a plurality of (eight in the illustrated example) inflow pipes 6 arranged radially at equal circumferences.
It is connected to an inflow port 3 provided near the bottom of the WL.

Between the lower part of the main body 1 and the draft tube 5,
The lower receiving net 7 is stretched by providing a gap C with the bottom 2,
An upper holding net 8 is stretched between an upper portion of the main body 1 and a slightly lower portion of an upper edge of the draft tube 5, and a space between the two nets 7 and 8 is filled with a filter medium 9. The filter medium 9 is formed by densely assembling cylindrical bodies except for the bottom of a container having a trade name of Yakult, for example, and arranging them at random. A plurality of outlets 4 are provided on the outer periphery of the gap C of the main body 1.

The draft tube 5 has an air diffuser 10 near the bottom.
The air diffuser 10 is connected via a hose 11 to an air compressor (not shown) provided on land.

On the other hand, on the outer periphery of the main body 1, a plurality of (three in the illustrated example) screw jack-type support legs indicated by reference numeral 12 are provided in a circumferentially equidistant manner. The support legs 12 include nuts 13a and 13b fixed to the main body 1, a screw shaft 14 screwed to the nuts 13a and 13b, and a relatively large-diameter disk 15 provided at the lower end of the screw shaft 14. And a handwheel 16 provided at the upper end of the screw shaft 14,
The position of the upper edge of the main body 1 can be adjusted up and down by operating the handwheel 16.

 Next, the operation will be described mainly with reference to FIG.

The device A is hung on the bottom of the water, and the main body 1 is stably supported on the sludge on the bottom of the water by the three disks 15.

Next, the handwheel 16 is operated to position the upper edge of the draft tube 5 so as to be substantially flush with the water surface WL.

Next, the air diffuser 10 is connected to an air compressor on land via a hose 11, and air is supplied by the air compressor. However, the air compressor may be provided not in the land but in the main body 1 and driven by, for example, a solar cell. Then, due to the air lift pumping action of a large number of air particles B floating from the lower end opening of the diffuser pipe 10, sewage near the water surface WL is drawn into the draft tube from the inflow port 3 through the inflow pipe 6 as shown by arrows a and b. Is done. The sucked sewage is sucked upward and guided to the filter medium 9 side from the upper edge of the draft tube 5 as shown by an arrow c. It is preferable that the upper end of the draft tube 5 be located slightly above the water surface WL so that the head of water passing through the filter medium is enlarged. The guided sewage is purified while passing through the filter medium 9 and is discharged from the discharge port 4.

Therefore, sludge on the bottom of the water is not wound up in the draft tube.

Further, the aeration effect is limited to only oxygen supplied from the air diffuser 10, and no disturbance occurs.

Therefore, the SS-capturing property of the cylindrical filter medium is increased, the formation of a biofilm is facilitated, and the organic matter is totally oxidized.

In addition, by controlling the amount of air supply to keep the dissolved oxygen concentration low, the oxygen use efficiency increases, and the BOD treatment efficiency increases.

[Effects of the Invention] Since the present invention is configured as described above,
It is possible to efficiently purify sewage in relatively shallow water bodies, such as lakes and marshes, without rolling up sludge on the bottom of the water.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a longitudinal sectional view, FIG. 3 is a top view excluding a filter medium and the like, and FIG. It is a side view around. A: treatment apparatus, C: gap, 1: body, 4: discharge port, 5: draft tube, 6: inflow pipe, 9: filter medium, 10: diffuser pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 3/06 C02F 3/22 C02F 7/00

Claims (1)

(57) [Claims] An overwater type sewage treatment apparatus for purifying sewage in a water area having a relatively shallow water depth, wherein a central pipe is provided at the bottom of a cylindrical container-shaped main body which is mounted on a water bottom and has an upper edge protruding above the water surface. The center pipe is communicated with the upper periphery of the main body by a plurality of inflow pipes in which the lower part of the central pipe is arranged radially. An overwater type sewage treatment apparatus characterized in that a plurality of through-holes are formed, and an air diffuser is inserted into the central pipe to a portion near the bottom thereof.