JPS60183095A - Preparation of carrier for fluidized bed biological treatment apparatus - Google Patents

Abstract

PURPOSE:To enhance the adhesiveness and inhabiting capacity of a microorganism, by adding 5-15pts.wt. of water to 100pts.wt. of perfectly saponified polyvinyl alcohol at 20-80 deg.C under stirring to form a granular fluidized bed carrier with a particle size of 5-15mm.. CONSTITUTION:5-15pts.wt. of water is added to 100pts.wt. of perfectly saponified polyvinyl alcohol at 20-80 deg.C under stirring to obtain a granular fluidized bed carrier with a particle size of 5-15mm.. The size of a carrier granule is set to 5-15mm. so as to be capable of easily separating activated sludge floc formed by waste water treatment by a screen. Concretely, 10pts.wt. of water is sprayed to 100pts.wt. of perfectly saponified polyvinyl alcohol (a polymerization degree is 1,000-2,500 and a saponification degree is 98mol% or more) at 20-80 deg.C under a stirring speed of 500-1,000rpm in a Henschel mixer and the resulting mixture is granulated for 5-20min to obtain a granular carrier with a particle size of 5-15mm..

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a fluid carrier for an aerobic or sickle gas biological treatment device used for the treatment of domestic wastewater, human waste or industrial wastewater.

Fixed beds (catalytic oxidation) or moving beds (rotating disks) are used in wastewater biological oxidative decomposition treatment equipment, but fluidized beds have the advantage of being overly attached with microbial films. Although it is known that this technique can increase the habitat surface area for microorganisms without clogging the cancer bed, it has not been put into practical use much.

The reason for this is that the carriers tried in the past were made of hydrophobic materials such as polyethylene or polypropylene and had low adhesion to microorganisms, and the foams proposed to improve adhesion were also too light in specific gravity and did not float. This is due to the drawback that it is difficult to fluidize evenly in water. In addition, if hydrophilic activated carbon or sand has a small diameter that easily fluidizes, it is difficult to separate it from the activated sludge flocs, whereas if the diameter is large, the separation from the flocs is good, but the power required for fluidization increases. There were drawbacks.

The present invention relates to a method for producing a hydrophilic synthetic resin-coated carrier that has excellent adhesion and habitability for microorganisms and has a specific gravity suitable for fluidization, and a method for coating this carrier with fine activated carbon powder and making it easy to use. The present invention provides a method for producing a microorganism carrier in which microorganisms that can be activated are preliminarily loaded and dried.

Completely saponified polyvinyl alcohol is the most effective wood-philic synthetic resin.

By utilizing the property of being soluble in hot water and insoluble in cold water, it is possible to form granules in which particles are tightly bound together under heating, and not only to be able to form a shape that cannot be broken in cold water, but also to be biologically difficult to decompose. Since it is a sex, it can be used for long-term use.

Furthermore, this material has strong adhesive properties and the surface of the granules easily melts under heating, making it easy to coat with finely powdered activated carbon, which is difficult to peel off at room temperature6. The activated sludge fluff (2-3 mm) produced as a result of wastewater treatment can be easily separated with a screen.
The particle size is preferably 1 mm or less, and this particle size is selected depending on the granulation and agitation conditions of the material.

In the present invention, the heating temperature of the material is 20 to 80°C, the stirring speed is in the range of 500 to 11,000 rpm, and the material 1
The amount of cold water to add is 5 to 15 fl! The quantity is appropriate.

Example 1 Completely saponified polyvinyl alcohol) Lt (m carbon-containing 1000-2500 rpm) in a Henschel mixer at a temperature of 20-80" O1 with a stirring degree of 500-11000 rpm.
, concentration of 88 mol% or more) lo.

Spray cold water lO heavy acid parts on heavy urban areas, 5 to 20 minutes.
It was possible to obtain a granular carrier having a particle size of 5 to 15IIIO by granulation.

Example 2 The granular carrier obtained in Example 1 was further heated and stirred and added with fine powder activated carbon having a particle size of 200 to 325 mesh or more [-0.
5 to 3 parts were gradually added to obtain a granular carrier coated with finely powdered activated carbon on the surface of the granules.

Example 3 The granular carrier of Example 1 was immersed in a microorganism culture solution useful for each type of wastewater, and then freeze-dried at -20°C for 24 hours to produce a carrier supporting microorganisms.

Example 4 The activated carbon-coated granule carrier of Example 2 was treated in the same manner as in Example 3 to produce a microbial carrier.

1; Distribution When each of the 40 bodies of the present invention is applied to a fluidized bed biological treatment apparatus, there are the following advantages.

In the case of conventional hydrophobic presses, when replenishing the oxygen necessary for aerobic microorganisms, indirect aeration is required to avoid the detachment of the formed microbial film, resulting in poor oxygen dissolution efficiency and problems with biological treatment equipment. Although the efficiency was low, since the microbial film of the press of the present invention has strong adhesion, direct aeration is possible and oxygen supply means are free.

Since the specific gravity of the undeveloped QIJ carrier is close to that of the water to be treated, it is easily fluidized even by direct aeration, and the contact efficiency is improved.

Furthermore, the microorganism-carrying carriers of Examples (3) and (4) can shorten the acclimatization period of the processing equipment to a few days, thereby eliminating the waste of conventional methods where aeration must be carried out even when the factory is shut down. The processing equipment can be operated according to the plant operation.

Note that as the microorganism supported on the surface of the carrier, an anaerobic microbial film such as methane-fermenting bacteria can also be supported.

Lower/Itoliokuji Kanteng' + hlj ■ ・Display of 11P1 1982 Patent TM No. 37272 No. 2, Issued jllll
Name of 1st year animal bed 1 material processing equipment j+, 4 body manufacturing and crushing method 3 Tei 1
You who do 11- = 1 sin system with lf sex 411. M Treasurer 1 person 11 locations
East j: I' m till RJ L% IT "J till"
l 1' It 4 incense 1'=L.

Name Denka Engineering Co., Ltd. 1 Representative Takeshi Miya Tama 4 Agent 5, Supplement 11 - Order 114 = Ike (Voluntary) 6, Supplement 1]
-The number of IJI increases due to N/A 7, Supplement 11 Nori,
j The range of ヰ414' in the specification.

8 Supplement 1 [Contents of: As stated in the attached sheet.

Neichi -1 Shiki's book 1. The scope of the claims is supplemented as follows.

2. Claims (1) Completely saponified polyvinyl alcohol 100i Amount M
To this, 5 to 15 parts of water was added under stirring at a temperature of 20 to 80°C to form a granular fluidized bed 11 with a particle size of 5 to 15 mm.
How to construct a j-body #JI.

(2) Completely saponified polyvinyl alcohol +001<4i
0.5 parts of finely powdered activated carbon was added to granulated human blood with a particle size of 5 to +51% obtained by adding 5 to 15 parts of ice in a stirring oven at a temperature of 20 to 80°C. A method for producing a granular fluidized bed carrier coated with finely powdered activated carbon by adding ~3 parts.

(3) Wastewater to which granules with a particle size of 5 to 15 IIIll obtained by adding 5 to 15 parts of water to 100 parts by weight of completely saponified polyvinyl alcohol under stirring at a temperature of 20 to 80°C are applied. A method for producing a microorganism-adhered scrofulous bed carrier by immersing it in a microbial culture solution useful for the treatment of spores, and then freeze-drying it.

(4) Stir 5 to 15 parts of water to 100 parts of fully corroded polyvinyl alcohol at a temperature of 20 to 80°C.
Particles obtained by adding in de- ¥5 to 15III+
0.5% of fine powder activated carbon is applied to the surface of the 1σ polygon of n under heating and stirring.
Microorganisms useful in the treatment of wastewater should be applied to the granules coated with finely powdered active microorganisms 18-1 which can be reconstituted by adding ~3 mixtures! *After soaking in the bow J, freeze-dry it to make 1 microorganism deposit 1 perturbation bed
How to make one.

Claims (4)

[Claims] (1) A method for producing a granular fluidized bed carrier with a particle size of 5 to IF+am by adding 5 to 15 parts of water to 100 parts of completely saponified polyvinyl alcohol under stirring at a temperature of 20 to 80°C. . (2) Completely saponified polyvinyl alcohol 100 parts by weight are added to the surface of granules with a particle size of 5 to 15 mm obtained by adding 5 to 15 parts of wood under stirring at a temperature of 20 to 80°C. A method for producing mWt granular fluidized bed body covered with fine powder activated carbon by adding 0.5 to 3 parts of fine powder activated carbon having a particle size of 325 mesh or less. (3) Completely saponified polyvinyl alcohol 100 parts of waste water should be treated with granules with a particle size of 5 to 15 m, obtained by adding 5 to 15 parts of water under stirring at a temperature of 20 to 80°C. A method of manufacturing a microorganism 4=J fluidized bed carrier by immersing it in a microorganism culture solution useful for treatment and then freeze-drying it. (4) Completely saponified polyvinyl alcohol 100 parts by weight, add 5 to 15 parts of water to the surface of the granules with a particle size of 5 to 15III11 obtained by adding 5 to 15 parts of water under stirring at a temperature of 20 to 80°C. Finely powdered activated carbon-coated granules obtained by adding 0.5 to 3 parts of finely powdered activated carbon of 325 mesh or less are immersed in a microbial culture solution useful for the treatment of wastewater to which it is applied, and then freeze-dried to produce microorganisms. +Method of manufacturing an IM crybed carrier.