JPH0149559B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in an upflow type adherent biofilm reaction device for the purpose of culturing anaerobic microorganisms at high concentrations.

[Conventional technology]

Conventionally, anaerobic biofilm reactors have been used, for example, in "Recent Trends in Anaerobic Treatment ()" (P.43-P.55, Yuhei Inamori, "Water and Wastewater" (Vol. 24 No. 2 (1982)). , Ryuichi Sudo) and “Water and Wastewater” (Vol.25 No.10)
(1983), “Current status and future trends of anaerobic treatment of organic wastewater” (P.3-P.21, Yuhei Inamori, Ryuichi Sudo), forming a biofilm. Hydraulic Residence Time (HRT) of Wastewater by
and sludge retention time (SRT), and as a result, it is possible to maintain a high biological concentration in the reactor even at short HRT, making it possible to tolerate high volume loads. .

This reactor has a solid-gas-liquid separator installed above the interior to separate metabolic gas, sludge, and treated water.

[Problem that the invention seeks to solve]

However, such a reactor has the disadvantage that it requires a long period of 3 to 9 months because the growth rate of anaerobic organisms is slow and biofilm formation is required. Regarding anaerobic organisms, especially methane bacteria,
The secretion of extracellular adhesive substances, which are thought to play an important role in biofilm formation, is extremely low, which is the cause of the delay in biofilm formation.

Therefore, if anaerobic bacteria are not attached to the carrier or self-agglomerated, sludge flocs from these bacteria will be easily floated by the upward flow rate and increase in metabolic gas. It will leak out. In order to prevent this, a sludge separator is installed, or if only a clarification zone is installed, the part where the settled sludge is returned to the reactor has an upward flow, so the sludge flows into the separator by convection. However, it is not efficiently circulated within the reactor.

[Purpose of the invention]

The present invention was made in order to solve such conventional problems, and its purpose is to prevent the sludge that floats due to the rise in metabolic gas and the upward flow rate from flowing out of the reactor, thereby preventing the reaction from occurring. The purpose is to efficiently circulate the parts.

[Means for solving problems]

The sedimentation separation mechanism in the anaerobic bioreactor according to the present invention includes an inclined partition plate arranged at the top of the upflow type attached biofilm reaction device, a gas lift tube formed at the top of the partition plate, and A gravity settling tank is formed on the side of the partition plate, and an opening is provided at the bottom of the partition plate to allow the settled sludge to flow down.

[Action of the invention]

In the present invention, the sludge flocs that have risen from the reaction section due to metabolic gas and upward flow velocity are floated along the partition plate, flow into the clarification zone through the gas lift tube, and flow into the gas lift tube. The generated turbulence separates the gas bubbles attached to the sludge flocs, and the sludge flocs separated from the gas settle by gravity in the clarification zone. The sludge that has settled along the partition plate is removed by the gentle circulation flow in the clarification zone that is generated when the sludge mixture containing gas bubbles rises and passes through the gas lift tube. It passes through the lower part and returns to the reaction section again.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a first embodiment of the invention.

In the figure, 1 is an upflow type attached biofilm reactor,
A known reactor 2 is formed in the lower part, and a sludge settling mechanism 3 is provided in the upper part.

The sludge settling mechanism 3 includes a pair of partition plates 4, 4 which are disposed opposite each other in a substantially V-shape, and a pair of gas lift tubes 5, 5 which are formed in opposition to and connected to the upper part of the partition plate 4. , a pair of plates 7 located above the gas lift tubes 5, 5 and arranged facing each other so as to be wider than the gas lift tubes 5, 5;
A clearing zone 6 constituted by 7 and a partition plate 4
a gravity settling tank 8 formed on the side of the gravity settling tank 8; a large number of inclined plates 10 disposed at the outlet 9 above the gravity settling tank 8; It is constituted by a sludge return opening 11 formed between the lower part and the reactor 1.

Further, above the sludge settling mechanism 3, a gas reservoir 12 and a treated water receiver 13 are provided, similar to the known upward flow type attached biofilm reaction device. The generated methane gas is stored in the gas reservoir 12, and the treated water receiver 13 has a clarification zone 6 and a large number of inclined plates 1.
The treated water that has passed through the outlet 9 flows out from the outlet 9.

Next, the operation of this embodiment configured as described above will be explained.

As shown by the arrow A from the reactor 2, the sludge flocs that float after the rise of metabolic gas and the adhesion of gas bubbles rise along the partition plates 4, 4, and pass through the gas lift tubes 5, 5 to the clarification zone 6. flows into.
The turbulent flow generated within the gas lift tubes 5, 5 separates the gas bubbles adhering to the sludge floes. The sludge flocs in the mixed liquor separated from the gas settle by gravity in the clarification zone 6.

The sludge flocs settling from the clarification zone 6 are moved through the gravity settling tank 8 by the downward flow caused by the circulating flow generated by the upward passage of the mixed liquid containing gas bubbles through the gas lift tubes 5, 5. ,4
It settles along. Further, among the sludge flocs settling from the clarification zone 6, fine flocs that settle slowly due to gravity are prevented from flowing out by a large number of inclined plates 10 provided at the outlet 9, and are guided to the gravity settling tank 8. Ru.

In this way, the sludge flocs that have settled at the bottom of the partition plates 4, 4 are moved between the partition plate 4 and the wall surface of the reactor 1 as shown by arrow B due to the slow circulation flow generated in the clarification zone 6. It is pushed back into the reactor 2 from the interval 11.

The treated water flows out from the outlet 9 provided with a large number of inclined plates 10 and is discharged to the outside of the reactor 1 from the treated water receiver 13. The methane gas separated in the clarification zone 6 is stored in a gas reservoir 12 and is used as fuel or the like via a line.

In the above embodiment, a case was explained in which one set of partition plates 4, 4 and gas lift tubes 5, 5 were used, but for example, as shown in FIG. 2, two sets of partition plates 4, 4 and gas lift tube 5 were used. , 5 may be provided. Further, the partition plate 4 and the gas lift tube 5 may be one piece as shown in FIG. 3, for example. Furthermore, in the present invention, the upflow type attached biofilm reaction apparatus may be of either an expanded bed method or a filter bed method.

〔Effect of the invention〕

As described above, the present invention arranges an inclined partition plate above an upflow type attached biofilm reaction device, forms a gas lift tube in the upper part of the partition plate, and forms a clarification zone in the upper part of the partition plate. A gravity settling tank is formed on the side of the partition plate, and an opening is provided at the bottom of the partition plate to allow the settling sludge to flow down.
The sludge flocs that have risen due to metabolic gases or upward flow are efficiently separated into gas and sludge in the clarification zone, and the sludge flocs are gravity-sedimented by the circulating flow and returned to the reactor. becomes possible.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a main part showing a first embodiment of the invention, Fig. 2 is a partially cutaway perspective view showing a second embodiment of the invention, and Fig. 3 is a sectional view of a third embodiment of the invention. FIG. DESCRIPTION OF SYMBOLS 1... Upflow type attached biofilm reactor, 2... Reactor, 3... Sludge settling mechanism, 4... Partition plate, 5...
Gas lift tube, 6... Clarification zone, 7...
Plate body, 8... Gravity settling tank, 9... Outlet, 10...
... inclined plate, 11 ... opening, 12 ... gas reservoir,
13... Treated water receiver.

Claims (1)

[Claims] 1. In an anaerobic biological reactor in which a clarification zone, a gas reservoir, and a treated water receiver are provided in the upper part of an upflow type attached biofilm reaction device, an inclined partition plate is used as an upflow type attached biofilm reaction device. Arranged above the attached biofilm reactor, a gas lift tube is formed at the top of the partition plate, a clarification zone is formed above it, a gravity settling tank is formed at the side of the partition plate, and a gas lift tube is formed at the bottom of the partition plate. 1. A sedimentation separation mechanism in an anaerobic biological reaction device, characterized by having an opening through which settling sludge flows down. 2. The sedimentation separation mechanism in an anaerobic biological reaction apparatus according to claim 1, wherein the partition plate has a pair of plates facing each other in a substantially V-shape. 3. The sedimentation separation mechanism in an anaerobic biological reaction apparatus according to claim 1, wherein the gas lift tube has a pair of plates connected to each other so as to face each other at the upper part of a partition plate. 4. The clarification zone formed in the upper part of the gas lift tube is constructed by disposing a pair of plates facing each other so as to be wider than the gas lift tube. Sedimentation separation mechanism in an anaerobic biological reactor. 5. A large number of inclined plates are arranged above the gravity settling tank to prevent fine flocs, etc. that are not separated by gravity settling from flowing out of the reactor. A sedimentation separation mechanism in the anaerobic biological reaction device according to item 1. 6. The sedimentation separation mechanism in an anaerobic biological reaction device according to claim 1, wherein the upflow type attached biofilm reaction device is an anaerobic treatment device using an expanded bed method or a filter bed method.