JPH07275885A - Granule recovery apparatus - Google Patents

Abstract

PURPOSE:To prevent the lowering of the concn. of granules in a reactor and to keep the original treatment capacity of the reactor, in performing the decomposition treatment of org. industrial waste water by anaerobic bacteria, by separating and regenerating granules flowing out along with treated water to again return the same to the reactor. CONSTITUTION:The treated water containing granules overflowing from an ascending flow type anaerobic treatment reactor A passes through the screen 5 of a granule separation means 2 to be stored in the bottom part of a box body 4 and subsequently drained from a drain pipe 7. The granules caught by the screen 5 pass through the opening part 8a of a base stand 8 to be recovered in the granule recovery tank 9 of a granule return means 3. The granules are subjected to stirring treatment along with a part of the treated water introduced from a treated water introducing line 12 and the fine pulverization of granules or the removal of the gas or oil component bonded to the granules is performed and, thereafter, the granules are returned to the reactor A by a return pump 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recovering granules used in a UASB reactor (upflow anaerobic treatment reactor) for decomposing organic industrial wastewater with anaerobic microorganisms.

[0002]

2. Description of the Related Art Conventionally, UA has been used as an apparatus for biologically treating organic industrial wastewater (raw water) containing a high concentration of organic substances.
There is an upflow anaerobic treatment reactor (UASB reactor) using the SB method (upflow anaerobic sludge bed method). As shown in FIG. 3, this upflow type anaerobic treatment reactor is provided with a gas-solid separation means c inside a rectangular treatment container a to which an inflow pipe b for introducing raw water is connected. In addition, a treated water outflow portion d and an exhaust pipe e are provided on the upper portion thereof, and when the raw water introduced from the inflow pipe b is passed in an upward flow, the organic matter contained in the raw water is converted into methane. The methane is fermented and decomposed by anaerobic microorganisms such as producing bacteria, and the decomposed treated water and biogas are further separated into treated water, biogas and anaerobic microorganisms by the gas-solid separation means c, and then treated water. Is overflowed from the upper end of the processing container a and flows out, and the biogas is extracted from the exhaust pipe e and used as fuel or the like.

[0003]

By the way, the anaerobic microorganisms are propagated in and out of particles called granules having a diameter of about 1 to 3 mm and are housed in the processing container a. After being decomposed, it is separated by gas-solid separation means c to prevent outflow. However, as shown in Fig. 2, depending on the type of raw water, oil or gas may adhere strongly to the granules, or the granules themselves may become enlarged and take gas into the inside, so that the granules may become volatile. In some cases, the liquid passed through the solid-liquid separation means c, floated up, and flowed out of the reactor together with the treated water, so that the amount of granules in the reactor decreased and the treatment capacity deteriorated.

Therefore, the present invention has been devised in order to effectively solve the above problems, and its purpose is to effectively recover and recycle the granules that have flowed out together with the treated water. It is intended to provide a novel granule recovery device capable of preventing a reduction in the processing capacity of a flow type anaerobic treatment reactor.

[0005]

In order to achieve the above object, the present invention provides an upflow anaerobic treatment reactor containing organic industrial wastewater containing granular granules containing anaerobic microorganisms such as methanogenic bacteria. In the granule recovery apparatus for decomposing into biogas and treated water by supplying to, and separating the granules flowing out together with the treated water from the treated water into the upflow anaerobic treatment reactor again.
It comprises a granule separating means for separating granules in the treated water, and a granule returning means for regenerating the granules separated by the granule separating means and returning the granules into the upflow anaerobic treatment reactor. The returning means is a stirrer for stirring the granules separated by the granule separating means, and a pressure pump for returning the granules stirred by the stirrer into the upward flow anaerobic treatment reactor. It consists of and.

[0006]

The present invention is constructed as described above,
The granules flowing out of the reactor together with the treated water are separated by the granule separating means and then returned to the upflow anaerobic treatment reactor by the returning means again, so the amount of granules in the reactor decreases. As a result, it is possible to prevent deterioration of the processing capacity of the reactor. Further, the granules separated by the granule separating means are stirred by the stirrer of the granule returning means to physically remove the adhering gas and oil content, and then further enlarge the granules by the pressure pump. Since it is atomized and returned to the inside of the reactor, it is not immediately floated and discharged.

[0007]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the granule collecting apparatus 1 according to the present invention. As shown in the figure, this granule collecting apparatus 1 is used by being attached to the conventional upflow type anaerobic treatment reactor A as described above, and its constitution is granule separation for separating granules in treated water. It comprises a means 2 and a granule returning means 3 for regenerating the granules separated by the granule separating means 2 and returning them to the upflow anaerobic treatment reactor A.

The granule separating means 2 is provided with a screen 5 having an opening of about 0.8 to 4 mm inclined on one side surface of a box body 4 provided on the upper part of the granule returning means 3. The open end of the outflow pipe 6 for flowing the treated water flowing out from the upward flow type anaerobic treatment reactor A is located at the upper end portion. The box body 4 is a treated water container, and a drain pipe 7 for draining the accumulated treated water is connected to the bottom of the container body. On the other hand, the granule returning means 3 is provided in the base 8 for supporting the granule separating means 2, and the screen 5 is provided.
It is composed of a granule collection tank 9 for collecting the granules falling from the side, an agitator 10 provided in the granule collection tank 9, and a return pump 11, and is collected in the granule collection tank 9. The granules are returned from the granule recovery line 14 into the upflow anaerobic treatment reactor A by the return pump 11. In addition, a treated water introducing line 12 for introducing a part of the treated water drained from the box body 4 and a drain 13 for draining the liquid in the tank 9 are connected to the granule recovery tank 9, which is required. According to the requirements, treated water can be supplied and drained. A gas vent valve 15 is provided in the granule recovery line 14 so that the gas in the granule recovery line 14 can be vented if necessary.

Next, the operation of this embodiment will be described.

First, the treated water containing granules overflowing from the upward flow type anaerobic treatment reactor A flows from the outflow pipe 6 to the upper end side of the screen 5 of the granule separating means 2 and passes through the screen 5. After being collected at the bottom of the box body 4, it is drained from the drain pipe 7. On the other hand, the granules captured by the screen 5 of the granule separating means 2 slide down on the screen 5 and pass through the opening 8a of the base 8 and the inside of the granule collecting tank 9 of the granule returning means 3. And a part of the treated water introduced from the treated water introduction line 12 together with the stirrer 1
It is stirred at 0 for a predetermined time. As a result, the granules to which the gas or oil adheres are atomized or the adhered gas or oil is removed. And this granule
It is extracted from the granule collection tank 9 by the return pump 11, passes through the granule collection line 14,
After returning to the upflow type anaerobic treatment reactor A together with newly flowing raw water, the decomposition treatment of organic substances is performed again here.

As described above, according to the present invention, the granules flowing out together with the treated water are separated and regenerated and returned to the reactor A again, so that the amount of granules in the reactor A does not decrease, and the above-mentioned upflow anaerobic system is used. It is possible to prevent a decrease in the processing capacity of the sexual processing reactor. still,
The granules flowing out together with the treated water are once exposed to the air in the granule separating means 2,
The time is extremely short, and since only a few anaerobic microorganisms growing on the surface layer are affected, there is almost no effect on the original processing capacity of granules. Also,
The screen 5 may have any structure as long as it can capture only the granules flowing out together with the treated water and allow it to fall freely, and may be a bar screen in which rods are arranged in parallel or a grid-like net. Further, in order to maximize the processing capacity of the regenerated granules, a PH adjusting device or the like may be additionally provided.

[0013]

In summary, according to the present invention, since the granules flowing out together with the treated water can be separated and regenerated and returned to the reactor again, the concentration of the granules in the reactor is not lowered and the reactor It is possible to exhibit excellent effects such as maintaining the original processing capacity.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a state of granules flowing out together with treated water.

FIG. 3 is a perspective view showing a configuration of a conventional upflow anaerobic treatment reactor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granule recovery device 2 Granule separation means 3 Granule return means 10 Stirrer 11 Return pump A Upflow anaerobic treatment reactor

Claims (2)

[Claims] 1. An organic industrial wastewater is supplied to an upflow-type anaerobic treatment reactor containing granular granules containing anaerobic microorganisms such as methanogenic bacteria and decomposed into biogas and treated water, In a granule recovery device for separating the granules flowing out together with the treated water from the treated water and returning the granules again into the upward flow anaerobic treatment reactor, a granule separation means for separating the granules in the treated water and And a granule returning means for regenerating the granules separated by the granule separating means and returning the granules into the upflow anaerobic treatment reactor. 2. The returning means is a stirrer for stirring the granules separated by the granule separating means, and a returning pump for returning the granules stirred by the stirrer into the upflow anaerobic treatment reactor. The granule collecting apparatus according to claim 1, wherein the granule collecting apparatus comprises: