JPH01143609A - Concentration device of biosludge - Google Patents

Abstract

PURPOSE:To concentrate sludge with small labor by storing a filter bag with coarse meshes in a filter bag container with a filtered water-outlet below, and controlling the transmission flow velocity of filtered water from the filter bag by a pressure action to the internal circumferential surface of the container when a mixture liquid of sludge is stored. CONSTITUTION:A filter bag with coarse meshes which comes into contact under pressure with a slight gap (g) left with the internal circumferential surface and the internal bottom surface of the container 1 by a water pressure of a mixture liquid of sludge 6 stored is accommodated in a detachable manner within the filter bag container 1 with a filtered water discharge outlet 2 below. Then the flow velocity of filtered water from the filter bag 5 into the slight gap (g) is controlled by the afore-mentioned pressure action to the internal circumferential surface and the internal bottom surface of the container 1 when the mixture liquid of sludge is stored. As a result, a higher cost for equipment required conventionally for a large-size device is not required, and also the filter bag need not be cleaned due to clogging. Sludge can be concentrated with less labor and maintenance cost by extracting and treating sludge from a processing tank intermittently and at an unfixed timing.

Description

[Detailed description of the invention] [Industrial application] The present invention is applicable to activated sludge method, batch activated sludge method, intermittent ILA
The present invention relates to a device for dispersing sludge mixture (activated sludge and other biological sludge) t-7a discharged from a sewage treatment tank in biological treatment such as air treatment.

[Prior art and its problems]

Conventionally, biological sludge...l! In this method, the sludge is first condensed using sandalwood, and then the moisture in the sludge is forcibly sucked out under reduced pressure using a mesh cloth.

In order to carry out such a conventional method, the equipment is large, and the filter cloth must be washed frequently due to clogging, which requires a large amount of equipment and maintenance costs. It is.

[Purpose of the invention]

The purpose of the present invention is, in particular, to activate sludge method, batch activated sludge method,
In biological treatment such as intermittent aeration, there is no need for large equipment costs associated with conventional large equipment, and there is no need for cleaning cloth due to clogging. Our objective is to provide at a low cost a 1a clean device that can compress sludge to iq with extremely low labor and maintenance costs when sludge is sometimes extracted and treated.

(Structure of the Invention) 15. The accommodation device for biological sludge according to the present invention is arranged in a straining bag container having a temporary water outlet in the lower part, and uses water pressure of the sludge mixture to hold the container. Four coarse-grained bags are removably housed in pressure contact with the inner circumferential surface and inner bottom surface with a slight gap left, and the filtering bag is formed by the above-mentioned pressure contact action on the inner surface and inner tm of the container when the sludge mixture is filled. 14 are constructed so that the flow rate of filtrate water permeation from the inside to the wi gap is regulated.

〔Example〕

In FIG. 1 of the embodiment, numeral 1 is a four-bag container with an open top surface, and has a smooth inner circumferential surface, a flat inner bottom, and a small hole or a hole in the lower part. A narrow groove-shaped filtered water outlet 2...2 is provided, and the lower part of the filtered water outlet 2...2 is provided with an appropriate outflow regulating means 3.
via which it is connected to equipment 4 for collecting or discharging the filtered water. 5 is a coarse sanding bag which is removably housed in the storage container 1, and is made of a plain-woven fabric ribbon with a width of about 3 mm, such as that used for "soil for flood defense construction".
It is made along the inner circumferential surface and inner bottom surface of the container 51, and the upper opening can be closed by squeezing the opening.

The above-mentioned coarse-grained filling 5 is stored in the four-bag container 1, and the upper edge of the opening is folded back to the outside of the upper edge of the container 1,
Place 33i! When the sludge mixture 6t- discharged from the tank is allowed to flow in as shown in Fig. 2, the four bags 5 are brought into pressure contact with the inner circumferential surface and inner bottom surface of the container 1 by water pressure, leaving only a small gap g.

Since the bag 4 has a coarse mesh and has good water drainage, it initially allows the sludge to pass through along with the water. However, since these four bags 5 are in pressure contact with the inner circumferential surface and inner bottom surface of the container as described above, the flow rate of permeation from the four bags 5 into the slit g is small and gradually becomes clogged. The sludge acts as a filter, and only almost clear filtered water oozes out, and the sludge in the 4 bags 5 gradually leaks out from the surrounding areas! Reduced to 1u. The initial water that is discharged while containing sludge can be treated (returned to the deaf).

As the above-mentioned suitable outflow control means 3, for example, '
, the pipe line from the filtered water outlet 2 to the discharge equipment 4 is constricted by the valve 3 as shown in Figure IJ2 [M], or the outer bottom surface of the container 1 is flattened under load as shown in Figure 2 CB). As a form of pressure contact on the board surface! i! Can be administered.

The mechanism of filtration and concentration according to the present invention will be described in more detail.
In activated sludge, especially in batch processing, filamentous bacteria and the like grow quite easily, and although the rate of sedimentation is slow, other sludge microorganisms become entangled, creating what is called a sticky sludge mass. As mentioned above, when the sludge mixture 6 discharged from the treatment tank flows into the four bags 5, the sludge mixture 6 is brought into pressure contact with the inner peripheral surface and inner bottom surface of the container 1 due to water pressure. , 4 The water flow passing through the TwJ gap g between the bag 5 and the container 1 is small, and the container 20
The speed of the water flow leaking from the lower part is also regulated as described above. Therefore, the sludge in 4 bags 5 is! The sludge settles quietly without being shaken or disturbed, the sludge intertwines to form a network structure, and no particles are allowed to flow out from inside the four bags 5. In addition, Iu between the straining bag 5 and the container l
Since the JPJig is filled with clear filtered water, more filtered water oozes out from the four bags 5 due to the water pressure difference inside and outside the container and is sucked into the slit g.

Then, when the water level in the 4 bags 5 falls, the 4
The sludge No. 6 returned to the inside upper part of the bag 5 is peeled off from the M1 bag 5 by internal labor. In this way, the sludge layer 6'' is peeled off, so the filtration capacity of the lower part of the 4 bags 5 is regenerated, and it can be used without cleaning.The sludge mixture to be injected from the second time onwards Liquid 6 is slightly at the bottom of the center at 7.
a + The sludge 6' with a low Aa degree is rolled up and rolled up to become 4 thick, the above-mentioned film effect occurs and the 4 bags 5 become clear;
Only the filtered water leaches out, and no sludge particles or gold sludge come out.

By injecting the mixed sludge liquid 6 several times, an appropriate amount of compressed sludge is made in the four bags 5, and the mouth passage at the mouth of the baseball team is pulled up and d
Once the oil is removed from the bag 5t-accommodation 3J1, it can be used as it is as a sludge drying bag.

Approximately 10 to 20 days after drying by air drying, a clay-like dried sludge is obtained that is easily peeled off from the 4 bags 5. This dried sludge can be used as fertilizer as it is, and four bags 5 can be used without washing.

Area 1: Approximately 1m long, inflow water BOD approximately 800 rsv'
L.

Batch treatment is carried out twice a day, and in one inflow A of approximately 3,001 liters, four cylinders with a bottom hole of approximately 251 mm are placed in the upper part of the sludge, and a sensor is detected by the automatic excess sludge discharge device. MLIS3 approx. 5 every time it is determined that sludge removal is necessary.
Approximately 5000/A sludge mixture was drawn out and flowed into the apparatus of the present invention. 6 withdrawals for once every 1.5 days! D.1
The sludge was concentrated at the rate of 1 bag on day 0, and the bags were suspended and air-dried for about 18 days, resulting in concentrated dried sludge 4.5 V4 with a water content of 90%.

〔Effect of the invention〕

According to the device of the present invention, activated sludge method, batch activated sludge method,
In biological treatment such as intermittent aeration, there is no need for large equipment costs associated with conventional large equipment, and there is no need for cleaning cloth due to clogging. In some cases, the sludge is completely extracted and treated, but the sludge can be thickened with extremely little labor and maintenance costs. If the device of the present invention is placed in the space above the wastewater treatment tank, the sludge that flows out from the four coarse bags 5 can be returned to the treatment tank in the initial stage without the need for piping, and the filtrate can also be recycled into the treatment tank. It is also possible to discharge the water as reflux or effluent.

The thickened sludge obtained by the device of the present invention is stored in the storage 32.
The 4 bags 5 can be pulled out from the inside and dried, and the dried items can be used as fertilizer as is, and are also convenient for incineration. Furthermore, after drying, several pieces of dried sludge can be combined into a single bag that can be used for transportation or storage.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional side view of a main part of an embodiment of the apparatus of the present invention, and shows the state before injection of the sludge mixture;
Figure 2 [M] [B] shows the state in which four bags are pressed against the inner peripheral surface and inner bottom surface of the container due to the injection of the sludge mixture.
FIG. 3 shows a state in which the water level in the straining bag is lowered and contracted to form nine sludge layers, and a new sludge mixture is being injected. 1...4 bag storage container, 2...filtered water outlet, 5...4 coarse bags, 6...sludge mixed liquid, g... ...Small gap held between the 4-bag container and the 4-bags. Patent applicant: Tsurumi Seisakusho Co., Ltd.

Claims (1)

[Claims] A strainer bag storage container (1) with a filtration water outlet (2) in the lower part.
), the water pressure of the contained sludge mixture (6) creates a slight gap (g) between the inner peripheral surface and inner bottom surface of the container (1).
) is removably accommodated in a coarse-grained straining bag (5) that is pressed against the sludge mixture, and the strained bag is removed by the pressure applied to the inner circumferential surface and inner bottom surface of the container (1) when the sludge mixture is filled. (5) A biological sludge thickening device characterized by being configured such that the flow rate of permeation of filtered water from the inside to the slit (g) is regulated.