JPH0975982A - Mixed bed type anaerobic treatment device for organic waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixed bed type anaerobic treatment device for organic waste water enabling to treat SS-containing waste water at high speed and also to make the device compact. SOLUTION: In this mixed bed type anaerobic treatment device for organic waste water, a mixed bed type filling layer 7 in which a carrier 2 and granular sludge 3 are coexisted is filled in the reaction tank 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed bed type anaerobic treatment apparatus for organic wastewater containing a high concentration of suspended solids (SS) such as food industry wastewater and domestic wastewater.

[0002]

2. Description of the Related Art For anaerobic treatment, an upflow anaerobic sludge bed method (UASB) method using granulated sludge (see FIG. 2) formed by aggregating methanogens, and digested sludge as a ceramic pellet carrier. The method of adhering and using this furnace material in a fluidized bed or a fixed bed is adopted.

However, these methods have the function of treating high-load wastewater individually and the advantage of being able to remove SS efficiently, but on the other hand, they are granulated by the accumulation of SS in the reaction tank. There are problems such as sludge flowing out of the tank and deterioration of treated water quality due to passing of treated water through SS.

The organic matter concentration is low and medium (COD: 2).
The SS-containing wastewater of 0 to 2000 mg / l) has a drawback that it takes a long time to start up.

Further, as a conventional example, a hybrid reaction tank comprising a part using granule sludge and a part using a fixed bed of an inorganic carrier was also used, but in this case, a partition for holding the fixed bed is used. Plates and frames are required, which tends to increase the effective volume of the reaction tank.

[0006]

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to be able to anaerobically treat SS-containing wastewater such as food industry wastewater and domestic wastewater at a high speed, and also to make the apparatus compact. , To provide a mixed-bed type anaerobic treatment apparatus for organic wastewater.

[0007]

Means for Solving the Problems The mixed bed type anaerobic treatment apparatus according to the present invention has been devised in order to solve the above-mentioned problems, and a carrier (2) and a granule sludge ( 3) Mixed bed type packed bed (7)
It is characterized by being filled.

The carrier (2) is often made of ceramic pellets, but the carrier (2) is not limited to this. The granulated sludge (3) is an aggregate of methanogens, and a commercially available product can be used.

The mixed bed type packed bed (7) consisting of the carrier (2) and the granulated sludge (3) is, for example,
The (2) is formed by introducing the granulated sludge (3) into the reaction tank (1) and circulating the wastewater into the tower for a required time. The mixed bed type packed bed (7) may be prepared by preparing a mixture of the carrier (2) and granule sludge (3) in advance and filling the mixture into the tank.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be specifically described based on the illustrated embodiments.

In FIG. 1, a reaction tank (1) of about 2 liters is provided.
A mixed bed type packed bed (7) in which a carrier (2) having an effective volume of 65% by volume and a granule sludge (3) having an effective volume of 35% by volume are mixed therein is filled therein. Carrier (2)
Is a cylindrical ceramic pellet having a diameter of 2 mm and a length of 6 mm. The granulated sludge (3) has a diameter of 1 to 3 mm formed by aggregation of methanogens. The mixed bed type packed bed (7) consists of the cylindrical ceramic pellet carrier (2) and then the granulated sludge (3) in the reaction tank.
(1) It is formed by pouring it into the inside and circulating the waste water in the tank for about 1 hour.

While flowing constant temperature water through the jacket (4) of the reaction tank (1), waste water was introduced into the bottom of the reaction tank (1) by a waste water supply pump (5), and a mixed bed type packed bed (7) ) Move up inside. The top water is extracted by the circulation pump (6), combined with the original wastewater, and re-sent to the bottom of the reaction tank (1). The overflow water at the top of the tower is discharged from the top of the tower as treated water. Methane gas and carbon dioxide gas generated by the anaerobic treatment of wastewater are extracted from the top of the tower.

A continuous treatment operation was performed on the refined sugar factory wastewater shown in Table 1. HRT (liquid retention time in the tank) is 1
The water flow rate was increased stepwise so as to be changed from 2 hours to 2 hours. The total COD removal rate and SS removal rate of the treatment liquid were measured. The results are as shown in Table 2.

[0014]

[Table 1]

[Table 2] As is apparent from the above table, SS-containing wastewater having a low organic concentration is a high-speed anaerobic treatment.

[0015]

The mixed bed type anaerobic wastewater treatment apparatus according to the present invention comprises the reaction tank (1) and the carrier (2) and the granulated sludge (3) in a mixed state. Anaerobic treatment of SS-containing wastewater such as industrial wastewater and domestic wastewater can be performed at high speed.

Further, since the mixed bed type waste water treatment device does not perform stratification, for example, when the granule sludge 1 is added to the ceramic pellet carrier 1 in terms of volume ratio, it is only about 1 as a whole, and the compactness of the device can be achieved. .

The effects of the mixed bed type anaerobic wastewater treatment apparatus according to the present invention are summarized in Table 3.

[0018]

[Table 3]

[Brief description of drawings]

FIG. 1 is a schematic view showing a mixed bed type anaerobic treatment apparatus.

FIG. 2 is a schematic view showing granulated sludge.

[Explanation of reference symbols] 1: Reactor 2: Ceramic pellet carrier 3: Granule sludge 7: Mixed bed packed bed

Claims (1)

[Claims] 1. A mixed bed type packed bed (7) in which a carrier (2) and granulated sludge (3) are mixed in a reaction tank (1).
A mixed-bed type anaerobic treatment device for organic wastewater, which is filled with.