JPH0230077Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an oxidation date for nitrification and denitrification of organic sludge and organic waste liquids such as sewage and human waste (hereinafter collectively referred to as organic sludge). The improvements were made so that it could be made smaller and nitrification and denitrification treatments could be carried out more efficiently.

In a conventional oxidation date, a partition plate is set up in the center of the bottom of the tank with both ends slightly apart from each end of the tank, and a horizontal circulation path is formed around the partition plate to circulate the flow, supplying water into the tank. At the same time, about half of the length of the circulation waterway is made into an aerobic treatment section where oxygen is dissolved, where nitrification treatment is performed, and the remaining half of the waterway is made into an aerobic treatment section where oxygen is dissolved. The denitrification process was carried out in an anaerobic treatment section where no dissolved nitrogen was dissolved.

However, when processing with an oxidation date, it is necessary to increase the residence time, so the capacity of the tank must be increased, and the water depth must be made shallow to prevent sludge from accumulating at the bottom of the tank. , the recirculation velocity at the water surface and bottom must be approximately the same,
Inevitably, the installation area had to be increased.
Therefore, the area of contact with the atmosphere is large, and the temperature of the organic sewage in the tank decreases due to heat radiation, which has the disadvantage of reducing the efficiency of nitrification and denitrification. This problem is particularly severe in winter, and in order to prevent this, the entire tank is covered with a cover, but since the tank has a large area, the equipment cost increases and the work is very time-consuming. Furthermore, N ₂ gas generated during the denitrification reaction adheres to the scum, causing the scum to float to the water surface and come into contact with the atmosphere. As a result, the scum dries out, loses fluidity, accumulates and rots, becoming a source of bad odors and polluting the water surface.
In addition, the dried scum with reduced fluidity is not crushed and dispersed even when agitated with an aeration device, resulting in sludge with reduced biological activity, which has an adverse effect on the treatment function. Therefore, in this invention, the anaerobic treatment section that performs denitrification treatment does not require the supply of oxygen, so there is no need to expose the water surface to the atmosphere.In fact, it is preferable not to expose the water surface to the atmosphere in order to eliminate the supply of oxygen. In view of this, it is preferable that a vertical circulation path is formed in the tank by arranging partition plates in the horizontal direction within the tank, and that the top of the partition plates in the tank is in contact with the atmosphere, and that oxygen is supplied by an aeration device. The problems of the conventional oxidation date are solved by using an anaerobic treatment section under the anaerobic treatment section and the partition plate, and will be described below with reference to the illustrated embodiment.

Reference numeral 1 designates a long and narrow treatment tank. Inside the tank, a partition plate 2 is provided to separate the upper and lower parts while maintaining intervals 2a, 2b from each of the front and rear ends 1a, 1b. On top of the partition plate is an aerobic treatment section 3 for nitrification. , the lower part is an anaerobic treatment section 4 for denitrification,
At the upstream end of the aerobic treatment section 3, there is provided an aeration device 5 that surrounds the partition plate 2 and is a means for generating a water flow in which the mixed liquid circulates, as well as supplying oxygen to the aerobic treatment section 3.

In this embodiment, the aeration device 5 is a horizontally rotating aeration device that is immersed shallowly under the water surface to circulate the mixed liquid and supply oxygen in one device, such as a Kessner brush, a product handled by the applicant. A famous mammoth rotor or the like can be used. Furthermore, the present invention is not limited to this, and the water flow generating means and the oxygen supplying means may be provided separately. That is, any type of device may be used as long as it generates a circulating water flow within the tank and supplies oxygen to the aerobic treatment section. For example, a pump, a propeller-type water-flow generator, or the like may be used as the means for generating the water flow, and a diffuser-type aeration device may be used as the oxygen supply means. In addition, the partition plate 2 is provided with steps 1' on the inner surfaces of opposite side walls of the treatment tank, and concrete plates, etc., are laid across the steps 1' and 1', and the anaerobic It is preferable to make it removable in order to discharge sand deposited at the bottom of the sand treatment section 4. In addition, since the denitrification rate is generally somewhat faster than the nitrification rate, the installation height of the partition plate 2 is set to be slightly lower than the middle from the bottom of the treatment tank to the water surface. Increases the average flow velocity and effectively prevents sludge from settling at the bottom of the anaerobic treatment section.

Organic sewage to be treated flows into the anaerobic treatment section through an inflow channel 6, and treated water overflows from a drainage channel 7. This drives the water flow generating means (in the figure, the aeration device 5 also has this function) and generates a circulating water flow in the tank that surrounds the partition plate 2 in the direction of the arrow. 3, aeration device 5
Oxygen is dissolved and nitrification is carried out here, and
When the water passes through the interval 2a to the anaerobic treatment section 4, denitrification treatment is performed.

In this case, in the present invention, since the aerobic treatment section and the anaerobic treatment section are separated by the partition plate 2 and provided above and below, the installation area is reduced by approximately half compared to the conventional system.
At the same time, the heat dissipation area is also roughly halved, so there is less drop in water temperature, and even if a cover is used to prevent odor, prevent water heat dissipation, keep warm in winter, and prevent heavy snowfall, the size of the cover is small, and it is easy to cover. It is also easy to work with.

Furthermore, since the aerobic processing section is in contact with the atmosphere, and the anaerobic processing section is located under the partition plate and does not come into contact with the atmosphere, the environment of each processing section is optimal and the processing efficiency is increased.
In addition, a large amount of scum generated in the anaerobic treatment section moves under the partition plate, so it does not dry out in contact with the atmosphere, and when it floats up through the gap 2b, it is crushed by the aeration device 5 or water flow generating means before it dries. Since it is defoamed and dispersed in the liquid, it hardly exists on the water surface after passing through the aeration device. Therefore,
It eliminates the need for dangerous and unsanitary crushing and removal work of scum, and it also eliminates the need for scum that dries out, reduces fluidity, accumulates and rots, producing bad odors, or even when agitated with an aeration device. This eliminates the possibility of dispersion, resulting in sludge with reduced biological activity, which would adversely affect the treatment function. For this purpose, the aeration device 5 is provided at the upstream end of the aerobic treatment section into which the waste fluid circulates and flows from the anaerobic treatment section, as shown in the figure.

In addition, in order to make the flow velocity of the upper layer and lower layer as uniform as possible in each processing section 3, 4, buffles or flaps 8 for diverting the flow of the upper layer to the lower layer are provided at appropriate locations, and each interval 2a, 2b is turned. The guide wall 9, which accelerates the flow velocity on the inside, is eccentric to the end of the partition plate as shown in the figure, and is provided so that the inlet of the inner flow is wide and the outlet is narrow, to prevent sludge from stagnating or settling due to stagnation of the flow. prevent. Incidentally, the bumps or flaps 8 may be provided integrally with the partition plate, but by providing them at intervals as shown in Figures 2 and 3, it is possible to prevent sludge from stagnation in the bumps or flaps. can.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of one embodiment of the present invention;
The figure shows a longitudinal sectional front view of the same as above, and FIG. 3 shows a longitudinal sectional front view of another embodiment, in which 1 is a treatment tank, 2 is a partition plate, 3 is an aerobic treatment section, and 4 is an anaerobic treatment section. , 5 indicates an aeration device.

Claims (1)

[Claim for Utility Model Registration] A rectangular treatment tank having an inlet for organic sewage and an outlet for treated water, a partition plate that divides the inside of the treatment tank into upper and lower sections except for both ends in the longitudinal direction, and the partition In an oxidation date, comprising a water flow generating means that generates a circulating water flow surrounding a plate, and an aeration device installed above the partition plate and supplying oxygen, the partition plate is inserted from the bottom of the treatment tank. It is installed below the middle to the water surface, and an aeration device above the partition plate is provided at the end of the treatment tank on the upstream side of the circulating water flow, and the area above the partition plate is used as an aerobic nitrification treatment section, An oxidation date characterized in that the inflow channel is connected below a partition plate to form an anaerobic denitrification treatment section below the partition plate.