JP3262210B2 - Treatment method for water containing organic matter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating organic matter-containing water, and more particularly to a method for treating organic matter-containing water by adding a cement-based solidifying material or activated carbon to water containing organic matter to facilitate the treatment. .

[0002]

2. Description of the Related Art As a method for purifying water containing organic substances, an activated sludge method mainly comprising biological treatment is conventionally known.
The outline of the activated sludge method is shown below. FIG. 1 shows a flow chart of a typical activated sludge method. As shown in FIG.
Sewage containing organic matter is first passed through a screen to remove large foreign matter such as dust. Next, fine sand and the like are removed in the sand basin and flow into the first sedimentation basin 1. First
In the sedimentation basin 1, sewage is ventilated. As a result, microorganisms start to propagate and flocs float. This is called activated sludge and is mainly composed of bacteria and protozoa.

Subsequently, the activated sludge is sent to an aeration tank 2.
Here, by being mixed with the organic matter-containing water and passing air e,
Organic matter in the organic matter-containing water is oxidized by microorganisms. Some of the oxidized organic matter is taken up by microorganisms, absorbed by flocs, and reduced in concentration. Next, the activated sludge mixture discharged from the aeration tank 2 is sent to the second sedimentation basin 3, where it is separated into supernatant water and sludge. The supernatant water becomes treated water,
The sludge is returned to the aeration tank 1 as returned sludge a. By continuously performing this operation, the organic matter in the wastewater is purified.

[0004]

However, in such a conventional method for treating water containing organic matter, the organic matter is taken up by the microorganisms in the activated sludge and the excess sludge is added as the microorganisms increase. b occurs. Therefore, sludge treatment of the excess sludge b is required, and there are the following problems. That is, the organic matter-containing water is discarded in the sludge treatment plant 4 through solid-liquid separation → concentration → dehydration → drying → incineration → cement solidification, etc. Around that time, there was an odor problem.
Thereby, the inventor studied a method of treating the organic substance-containing water. As a result, water containing organic matter contains "cement-based solidifying material and quicklime" and "activated carbon or zeolite."
And "fluidized bed boiler ash" were added directly, and it was found that the organic matter was precipitated and solidified at the same time as the deodorization of water, and the odor of the precipitate was hardly found. Thus, the present invention was completed.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for deodorizing water containing organic substances and precipitating and solidifying organic substances at low cost. Another object of the present invention is to obtain a method for efficiently deodorizing water containing organic substances and precipitating and solidifying organic substances at low cost.

[0006]

According to the first aspect of the present invention, a cement-based solidifying material, quicklime, and fluidized-bed boiler ash are added to water containing an organic substance, and activated carbon is added to the water containing the organic substance. Alternatively, in the method of treating organic-containing water to which zeolite is added, the amount of addition to the water containing the organic substance is such that the cement-based solidifying material is 20 to 2% by weight, the quicklime is 20 to 2% by weight, The total amount of the solidified material and quicklime added is 32 to 4% by weight based on the water containing organic matter, while the total amount of activated carbon, zeolite and fluidized-bed boiler ash is 50% based on the water containing organic matter. ~ 1
This is a method for treating organic substance-containing water by weight.

In this case, a deodorizing solidifying material obtained by mixing a cement-based solidifying material and quick lime with activated carbon, zeolite and a fluidized-bed boiler ash may be added to water containing organic matter. Here, “cement-based solidifying material / quick lime” in the deodorizing solidifying material (hereinafter sometimes referred to as solidifying material side)
The mixing ratio with "activated carbon / zeolite / fluidized bed boiler ash" (hereinafter, also referred to as adsorbent side) will be described. For example, when "activated carbon / zeolite" is used, the mixing ratio is preferably about 5: 1, and when only "fluidized bed boiler ash" is used, it is preferably about 1: 1. In any case, if the mixing ratio of the adsorbent side to the solidifying material side is small, the solidification strength of the precipitate increases, and if the mixing ratio of the adsorbent side is large, the deodorizing and organic substance adsorption effects increase.

[0008] When "activated carbon / zeolite" and "fluidized bed boiler ash" are mixed and used, the ratio is in the range of 10: 1 to 1:10 depending on the mixing ratio of the materials in the adsorbent side. fluctuate. However, when the amount of organic matter is large and it is difficult to solidify, the ratio of the solidified material may be increased. In order to further enhance the deodorizing and organic substance adsorption effects, the ratio of the adsorbent may be increased. The above is not limited to the case where the deodorized solidified material is prepared in advance and added to the organic substance-containing water, but the solidified material side and the adsorbent side are added at the same time, or the case where any one is added first. Is basically applicable.

[0009]

In the method for treating organic matter-containing water according to the first aspect of the present invention, a cement-based solidifying material and quick lime are added to water containing organic matter, and then activated carbon or zeolite is further added. Add floor boiler ash. Alternatively, a deodorizing and solidifying material obtained by mixing them is added. The deodorizing solidified material is produced by adding activated carbon or zeolite, and further a fluidized bed boiler ash, to a cement solidified material and quick lime.

When the deodorizing and solidifying material is added to water containing an organic substance, the amount of the solidifying material such as a cement-based solidifying material is appropriately determined according to the content of the organic substance to be treated.

When the cement-based solidifying agent and quick lime are added together, the cement-based solidifying agent is 20 to 2% by weight and the quick-lime is 20 to 2% by weight based on the organic substance-containing water. The addition amount of the deodorizing material as a whole made of lime and quicklime is 32 to 4% by weight based on the water containing organic substances.
And With this composition, even if the organic matter is relatively large as compared with the simple substance, it can be appropriately solidified. In any case, if the amount of each material on the solidified material side with respect to the organic substance-containing water is small, sufficient solidification of the precipitate cannot be achieved.
Conversely, a large amount of this addition is uneconomical.

Further, the amount of addition of the adsorbent such as activated carbon is
It can be appropriately determined according to the odor intensity and the organic substance content of the organic substance-containing water to be treated. However, activated carbon alone is 15% by weight or less, especially 10 to 10% by weight, based on water containing organic matter.
It is preferable to add 0.2% by weight, and in the case of zeolite alone, it is preferable to add 15% by weight, particularly preferably 10 to 0.2% by weight. Further, in the case of a fluidized bed boiler ash alone, it is preferable to add 75% by weight or less, particularly 50 to 1% by weight.

When both activated carbon and zeolite are added, the content of activated carbon is 13% by weight or less, especially 7 to 0.1%.
On the other hand, the amount of zeolite is 13% by weight or less, especially 7 to 0.1% by weight, and the total amount of the adsorbent composed of activated carbon and zeolite is 15% by weight or less based on the organic substance-containing water. In particular, the content is preferably 10 to 0.2% by weight.

When the activated carbon and / or zeolite and the fluidized-bed boiler ash are added together, the total amount of the activated carbon and the zeolite is 10% by weight or less.
In particular, the content of the fluidized-bed boiler ash is set to 55% by weight or less, particularly 40 to 1% by weight, and the total amount of activated carbon, zeolite, and fluidized-bed boiler ash on the adsorbent side is set to 5 to 0.1% by weight. The content is set to 50 to 1% by weight based on the organic substance-containing water. By this blending, it is possible to sufficiently deodorize and precipitate organic substances. In any case, if the amount of each material on the adsorbent side relative to the organic substance-containing water is small, the deodorization of the organic substance-containing water and the precipitation of the organic substances are insufficient. Conversely, a large amount of this addition is uneconomical.

Activated carbon and / or zeolite have a large specific surface area and are therefore effective for deodorizing organic-containing water and removing organic substances by adsorption of malodorous substances and organic substances. Further, the fluidized-bed boiler ash contains a large amount of unburned carbon, and thus is effective for deodorizing organic-containing water and removing organic substances by absorbing malodorous substances and organic substances. In addition,
Since fluidized-bed boiler ash is generated as industrial waste,
It can be obtained at low cost. The general composition of the fluidized bed boiler ash is shown in Table 1 below.

[0016]

[Table 1]

In the method of the present invention, there is no particular limitation on the order of addition of the cement-based solidification material and / or quicklime (solidification material side) and activated carbon, zeolite and / or fluidized-bed boiler ash (adsorption material side). For example, even if they are added simultaneously, any of them may be added first. As described above, the addition ratio of each additive is preferably appropriately determined in the above range according to the content of the organic substance and the degree of the odor. According to the method of the present invention, by simply adding these additives to the organic substance-containing water, the malodorous substances and the organic substances are adsorbed and naturally precipitated and solidified, so that the organic substance-containing water can be treated efficiently.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically with reference to the following examples. In the following, the composition of the fluidized-bed boiler ash used is as shown in Table 2.

[0019]

[Table 2]

<Examples 1 to 17 and Comparative Examples 1 to 6> Each additive was added to sewage (water containing organic substances) generated in a beer factory at a ratio shown in Table 3 and mixed. Measure the strength of the odor and the uniaxial compressive strength of the precipitate,
The results are shown in the same table. The measurement of the uniaxial compressive strength was performed as follows. That is, a predetermined amount of an additive was added to the sample organic substance-containing water and mixed with a mixer until the water became uniform. This was put into a vinyl chloride pipe with an inner diameter of 5 cm and a height of 1 m (the bottom was covered with a vinyl chloride plate), and the temperature was 20 ± 3.
It was allowed to stand (cured) for 3 days in a room at ℃. The precipitate was demolded as follows.

That is, a vinyl chloride pipe was cut at a height of 15 cm, and the sediment was shaved while being pulled out of the pipe. When the height reached 10 cm, the mold was completely removed. Then, a uniaxial compression test was performed according to “JIS A1216 (uniaxial compression test method for soil)”. The odor sensory test of the precipitate was performed by the following method. That is,
The sample removed in the same manner as above was loosened and 11 × 14 cm
And surrounded all sides with a 16 cm high acrylic plate, and then smelled from above. And
The following four grades were evaluated.

XX: Strong smell X: Clear smell O: Weak smell A: Almost no smell The supernatant was also subjected to the same odor sensory test as the precipitate. At this time, turbidity was evaluated by the following three steps. ×: cloudy △: slightly cloudy ◎: transparent

[0023]

[Table 3]

As is clear from Table 3, the one to which activated carbon, zeolite and / or fluidized-bed boiler ash were added had almost no odor of the precipitate and no odor and no turbidity of the supernatant (Example 1). To 17). On the other hand, with the cement-based solidifying material and / or quicklime alone, the precipitate and the supernatant gave off a bad smell, and the turbidity of the supernatant remained unchanged (Comparative Examples 1 to 3). Conversely, without the addition of cement-based solidifying material and / or quicklime,
The precipitate hardly solidified and could not be handled as a solid even if deodorized by addition of activated carbon or the like (Comparative Examples 4 to 5).
6).

[0025]

According to the method for treating organic-containing water according to the present invention, there is no generation of offensive odor sludge unlike the activated sludge method, and the organic-containing water can be easily and efficiently reduced at low cost. Odor and organic matter can be precipitated and solidified.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a typical activated sludge method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First sedimentation tank 2 Aeration tank 3 Second sedimentation tank 4 Sludge treatment plant a Returned sludge b Surplus sludge e Air

Continuing from the front page (72) Inventor Hiroyuki Matsuda 1-1, Donanmachi, Yawatanishi-ku, Kitakyushu-shi, Fukuoka Prefecture Inside the Cement Development Center of Mitsubishi Materials Corporation (56) References JP-A-4-180884 (JP, A) JP-A-57-174134 (JP, A) JP-A-8-206700 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 1/28 C02F 11/00

Claims (1)

(57) [Claims] 1. A cement-based solidifying material in water containing organic matter,
Quick lime and fluidized bed boiler ash were added respectively,
An organic substance-containing water treatment method in which activated carbon or zeolite is added to the organic substance-containing water. The amount of the organic substance-containing water is 20 to 2% by weight of cement-based solidifying material and 20% of quicklime. ~ 2% by weight,
The total addition amount of the cement-based solidifying material and quicklime is 32 to 4% by weight based on the water containing organic matter, while the total addition amount of activated carbon, zeolite and fluidized-bed boiler ash is based on water containing organic matter. , 50 to 1% by weight of organic matter-containing water treatment method.