JPS6223596Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sewage treatment device that uses diffused energy to generate a circulating flow of sewage into an aerated area and a non-aerated area to treat sewage.

Recently, the oxidation date method, which treats wastewater by circulating it, has been attracting attention because it can perform denitrification treatment as well as BOD removal, but there has been no method that generates sufficient circulation flow and has high oxygen dissolution efficiency.

This invention solves the above-mentioned drawbacks, uses the energy of the aeration device to generate a circulating flow, and is extremely efficient in circulating sewage to the aerated and non-aerated areas, resulting in effective sewage treatment without causing sludge accumulation. The purpose is to provide a sewage treatment device that can perform the following tasks.

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

As shown in FIG. 1, a circulation waterway 3 is formed inside the aeration tank 1 so that a circulating flow is generated in one direction by a partition wall 2. 5, aeration areas 6 and non-aeration areas 7 are formed alternately.

As shown in FIG. 2, the aeration area 6 is connected to the non-aerated area 7 on the upstream side at the lower side on the upstream side, and is partitioned by a partition wall 4 (the same applies below the lower communication wall) projecting above the water surface on the upper side, On the other hand, the downstream side is partitioned off by a partition wall 5 below the water surface (the same applies below the submerged weir) which communicates with the non-aerated area 7 on the downstream side. Moreover, in the aeration zone 6, as shown in FIGS. 1 and 2, an aeration device 8 that blows out fine air bubbles is installed, so that the air lift effect in the zone causes As a result, an upward flow occurs, and the sewage flows over the partition wall 5 on the downstream side and flows into the non-aerated area 7 on the downstream side, and at the same time, the sewage flows in from below the partition wall 4 on the upstream side. Therefore, in addition to the aeration function, the aeration zone 7 also functions as an air lift pump, and is formed so that a circulation flow as shown by arrow A is generated throughout the aeration tank 1. Here, a small opening (not shown) is provided at the bottom of the lower end of the partition wall 5 below the water surface to circulate a portion of the sewage, thereby preventing sludge from accumulating in this area where a dead space for flow occurs. can. Also,
If a height adjustment valve (not shown) is provided at the upper end of the partition wall 5 below the water surface, the flow rate of wastewater can be adjusted.

In addition, a scum scraper 9 that is driven intermittently or continuously is arranged on the upstream side of the water surface of the partition wall 4 that protrudes above the water surface, so that the scum that has been collected in the downward communication buttful can be discharged to the outside of the tank. It's summery.

Incidentally, it is preferable that the wastewater to be treated flows into a non-aerated area 7 on the downstream side of the aerated area 6, as shown in FIG. When flowing into this position, the circulating wastewater that has passed through the aeration area 6 and has been nitrated is mixed with the inflowing wastewater, and denitrification treatment can be performed in the non-aeration area 7. The wastewater introduced for such treatment is denitrified, dephosphoroused, and COD removed while being alternately circulated through the non-aerated area 7 and the aerated area 6 by the circulation flow generated using the aeration energy as described above. etc. are carried out and treated, but a part of the aeration mixture is led to the settling tank 10,
After the precipitation treatment, the supernatant liquid is discharged, and the settled sludge is returned to the aeration tank 1 again. In this way, wastewater is circulated using the energy generated by aeration, so it is possible to save energy, and since it is a circulating type, short circuits can also be prevented. Further, the scum floating on the water surface is retained by a downward communicating baffle 4 projecting above the water surface, and is effectively discharged out of the tank by a scum scraper 9 disposed at this retention position. Note that a defoaming device may be provided at this location. Furthermore, since the partition walls 4 and 5 that partition the aeration tank 1 cross the circulation waterway 3 as shown in FIG. 1, the strength of the tank 1 wall is significantly improved.

FIG. 3 shows another embodiment of this invention, showing an aeration tank 1 in which a large number of aeration zones N and non-aeration zones A are provided alternately. That is, there is a partition wall 2 inside the aeration tank 1.
Circulation waterway 3 that generates circulation flow in one direction
Moreover, this circulation waterway 3 is alternately partitioned by partition walls (straight weir) 5 and partition walls (downward communication buttful) 4 similar to the above embodiment. An aeration device 8 is arranged in the aeration area A formed every other area partitioned in this way, and aeration areas N and non-aeration areas A are formed alternately. Therefore, the wastewater that has flowed into the aeration tank 1 is circulated alternately between the aeration area N and the non-aeration area A as shown by the arrows, and is effectively treated in the same manner as in the above embodiment.

As described above, according to this invention, wastewater is efficiently circulated between the aerated area and the non-aerated area by using the diffused energy, so that it has extremely excellent effects such as extremely effective wastewater treatment.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of this invention, FIG. 2 is a sectional view taken along line A--A in FIG. 1, and FIG. 3 is a plan view of another embodiment. 1...Aeration tank, 3...Circulation waterway, 4...Partition wall (downward communication buttuful), 5...Partition wall (sinkhole),
6,N...Aeration area, 7,A...Non-aeration area.

Claims (1)

[Scope of utility model registration request] An aeration tank that generates a circulating flow in one direction in the form of a circulation path, an aeration area and a non-aeration area that are alternately partitioned into this aeration tank, and an aeration area with the upstream side of the aeration area communicating with the lower part and the upper part above the water surface. A sewage treatment device comprising: a partition wall that protrudes from and partitions the aeration area; and a partition wall that partitions the downstream side of the aeration area below the water surface in an upwardly communicating manner.