JP2003251394A - Wastewater treatment apparatus and wastewater treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wastewater treatment method low in cost and reducing the total amount of a contained hardly degradable substance. <P>SOLUTION: This wastewater treatment apparatus is constituted so as to treat wastewater using microorganisms capable of microbially decomposing a specific compound, and equipped with a difference data acquiring part for acquiring difference data showing the difference between the value corresponding to the concentration of the specific compound before treatment and the value corresponding thereto after treatment and an addition part for adding at least one of microorganisms and nutrients therefor to a treatment tank when the difference specified by the difference data acquired in the difference data acquiring part is not more than a predetermined value. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wastewater treatment apparatus and a wastewater treatment method. In particular, the present invention relates to a wastewater treatment device and a wastewater treatment method for treating wastewater using microorganisms.

[0002]

2. Description of the Related Art Generally, for the decomposition of organic substances in industrial wastewater,
Activated sludge treatment has been carried out, but recently, compounds that cannot be decomposed by conventional activated sludge treatment, for example, biodegradable chelating agents such as EDTA, organochlorine compounds such as trihalomethane, and nonylphenol derivatives. The emission of various surfactants has become a social problem.
These compounds are difficult to biodegrade with conventional activated sludge, especially at high concentrations (eg, 200 ppm or more). Wastewater containing such a hardly biodegradable substance generally has a high COD value, and the most common treatment method is a dilution method in which it is diluted to below the emission control value and discharged.

[0003]

However, the dilution method is costly for water and does not reduce the total amount of hardly biodegradable substances discharged. Therefore, there is a demand for a wastewater treatment method that is low in cost and essentially reduces the total amount of the hardly biodegradable substances contained therein.

Therefore, an object of the present invention is to provide a wastewater treatment apparatus and a wastewater treatment method which can solve the above problems. This object is achieved by a combination of features described in independent claims of the invention. The dependent claims define further advantageous specific examples of the present invention.

[0005]

That is, according to the first aspect of the present invention, there is provided a wastewater treatment device for treating wastewater by using microorganisms capable of degrading specific microorganisms, which is suitable for the concentration of a specific compound before treatment. When the difference specified by the difference information acquisition unit that acquires difference information indicating the difference between the value to be processed and the processed value and the difference information acquired by the difference information acquisition unit is less than or equal to a predetermined value And an addition unit for adding at least one of the microorganisms and nutrients for the microorganisms to the treatment tank.

According to a second aspect of the present invention, there is provided a wastewater treatment method for treating wastewater using a microorganism capable of degrading a specific compound, wherein the value corresponds to the concentration of the specific compound before the treatment,
The difference showing the difference from the value after the treatment is investigated, and when the difference is less than or equal to a predetermined value, at least one of the microorganism and the nutrient for the microorganism is added to the treatment tank.

According to a third aspect of the present invention, there is provided a wastewater treatment device for treating wastewater using microorganisms capable of degrading specific microorganisms, the value corresponding to the concentration of the specific compound before treatment,
Difference information acquisition unit that acquires the difference information indicating the difference between the value after processing, and the difference specified by the difference information acquired by the difference information acquisition unit is a predetermined value or less, for microorganisms And an addition unit for adding the nutrients of 1. to the treatment tank.

According to a fourth aspect of the present invention, there is provided a wastewater treatment method for treating wastewater using a microorganism capable of degrading a specific compound, the value corresponding to the concentration of the specific compound before the treatment,
The difference showing the difference from the value after the treatment is investigated, and when the difference is less than or equal to a predetermined value, the nutrient for microorganisms is added to the treatment tank.

According to a fifth aspect of the present invention, there is provided a wastewater treatment device for treating wastewater using microorganisms capable of degrading specific microorganisms, the value corresponding to the concentration of the specific compound before the treatment,
Difference information acquisition unit that acquires the difference information indicating the difference between the value after processing, and the difference specified by the difference information acquired by the difference information acquisition unit, when the microorganism is less than or equal to a predetermined value, An addition unit for adding to the treatment tank.

According to a sixth aspect of the present invention, there is provided a wastewater treatment method for treating wastewater using a microorganism capable of degrading a specific compound, the value corresponding to the concentration of the specific compound before the treatment,
The difference indicating the difference from the value after the treatment is investigated, and when the difference is less than or equal to a predetermined value, the microorganism is added to the treatment tank.

The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the claimed invention, and the features described in the embodiments Not all combinations are essential to the solution of the invention.

The wastewater treatment apparatus according to the present invention is an apparatus for decomposing the hardly biodegradable substance contained in the wastewater by using microorganisms, and generally reduces the COD concentration of the wastewater. Specifically, the wastewater treatment equipment has a C content of 200 ppm to several thousand ppm.
Reduce COD value of wastewater with OD value by half or 100p
It is reduced to about pm.

The specific compound of the present invention means a compound which is hardly decomposed by conventional activated sludge, for example, a decomposition rate of 25%.
Hereinafter, it means a compound of 15% or less, preferably 10% or less. Examples include non-biodegradable chelating agents, organochlorine compounds, and nonylphenol-based surfactants. Above all, application to a hardly biodegradable chelating agent is preferable.

Examples of the waste water containing the hardly biodegradable chelate include industrial cleaning water, photographic waste water, waste water of pulp industry and plating industry, and the like. In particular, application to wastewater treatment in the electroless plating industry is preferable.

Examples of the hardly biodegradable chelating agent include E
Organic aminocarboxylic acids such as DTA (ethylenediaminetetraacetic acid), DTPA (diethylenetriaminepentaacetic acid), PDTA (1,3-propanediaminetetraacetic acid).
Especially, the case of EDTA is particularly effective. The substance is not limited to such a biodegradable substance, and any substance having a high COD value can be applied.

With respect to the concentration corresponding to the concentration of the specific compound, the concentration of the specific compound itself can be determined by various analytical methods such as liquid chromatography, but the COD value can be substituted. is there. Since the automatic analysis is possible in a short time, measuring the COD value is the most preferable method.

As a device for measuring the COD value, for example, OD-1000 / 1100 manufactured by COS Co., Ltd., HORIB
Commercially available devices such as CODA-211 / 212 manufactured by A and Hiranuma fully automatic COD measuring device COD-1500 manufactured by Hitachi High-Technologies Co., Ltd. are included, but are not limited thereto.
Any device that can measure the value may be used.

The concentration is preferably measured by measuring the concentration at both the inlet and outlet of each processing tank. In the case of a two-tank type processing tank, the first tank inlet, the first tank outlet (the same as the second tank inlet),
It is desirable to measure at three locations at the outlet of the second tank. The method of treating with a plurality of treatment tanks is a preferable mode because it is easy to optimize the microorganisms in each treatment tank, and as a result, the decomposition treatment can be performed in a small space in a short time. Particularly, a two-tank type processing tank is preferable.

The microorganisms to be added include, for example, Bacillus editoridas.
idus), Bacillus subtilis (Bacillus
subtilis), Bacillus megaterium (Ba)
Cillus megaterium, Bacillus sphaericus
s), Bacillus genus Bacillus such as Natto (JP-A-6-
(Described in No. 296990). The microorganism may be Pseudomonas of the genus Pseudomonas (described in JP-A-58-43782) or Alcaligenes of the genus Alcaligenes (described in JP-A-58-43782). Further, Agrobacterium of the genus Agrobacterium may be used. It may also be Mesophyllobacter editor Vidas (described in JP-A-8-289778).

In the treatment tank for treating the waste liquid, the dry weight of the microorganism is 100 g to 50 kg per 1 cubic meter of the waste water.
Is added. More preferably, 500 g to 5000 g of dry weight of microorganisms are added per cubic meter of wastewater. In the present embodiment, the microorganism may be added directly or may be added in a state of being immobilized on a carrier. Here, the carrier is a medium for immobilizing microorganisms, such as activated carbon particles, carbon fibers, or polymer gel. The use of a carrier is more preferable because the activity of the microorganism is higher. Further, instead of the microorganism, a degrading enzyme in the microorganism may be added.

As a method of entrapping and immobilizing microorganisms, various known methods can be used. Most commonly,
Method of immobilizing synthetic polymer in hydrous gel
No. 263575). Further, a method of immobilizing on activated carbon particles (described in JP-A-11-77074) or a method of immobilizing on carbon fiber cloth (JP-A-11-2)
No. 07379)).

The capacity of the treatment tank for treating wastewater varies depending on the amount of wastewater. For example, the retention time of the waste water in the treatment tank is adjusted to be about 0.2 to 20 days. Particularly, it is preferable to adjust the retention time of the waste water in the treatment tank to about 0.5 to 5 days. A plurality of treatment tanks may be provided. By providing a plurality of treatment tanks, wastewater can be treated more efficiently and in a short time in a small space.

The wastewater treatment device adds the nutrients of the microorganism to the treatment tank when the ability of decomposing the microorganism is lowered. Specifically, the wastewater treatment device is a carbon source suitable for the growth of microorganisms,
A nutrient consisting of a nitrogen source or an organic nutrient source inorganic salt is added to the treatment tank. As an organic nutrient source, for example, polypeptone,
Yeast extract, meat extract, molasses, etc. are added. As the inorganic nutrient source, for example, various phosphates and magnesium salts are added. For example, the wastewater treatment device has a capacity of 0.001 to 5
wt% / volume of organic nutrient source and 0.1% of the organic nutrient source
Add ~ 1 wt% / volume of inorganic nutrient source. More preferably, the wastewater treatment apparatus adds 0.01 to 1 wt% / volume of an organic nutrient source and 0.1 to 1 wt% / volume of an inorganic nutrient source of the organic nutrient source.

Further, the wastewater treatment device may add microorganisms themselves instead of the nutrients. The types of microorganisms added here are the same as those of the microorganisms added in advance, and thus the description thereof will be omitted. In the wastewater treatment device, the microorganism may be added while being immobilized on the carrier, or the microorganism may be directly added without being immobilized on the carrier.

Here, the waste water treatment apparatus adds microorganisms of 10 g or more and 50 kg or less in dry weight to the treatment tank per 1 cubic meter of waste water. More preferably, the wastewater treatment device is
20 g or more of dry weight per cubic meter of wastewater 500
0 g or less of microorganisms are added to the treatment tank.

The wastewater treatment equipment adds nutrients or microorganisms while stirring the inside of the treatment tank. For example, when the nutrients or microorganisms are liquid, the wastewater treatment apparatus adds the nutrients from the solution tank or container by a liquid feed pump or manually while performing aeration in the treatment tank or stirring with a stirrer. When the nutrients or microorganisms are solids such as powders, the wastewater treatment device inputs the nutrients through the input hopper and the transportation device. In this way, by adding nutrients or microorganisms while the wastewater treatment equipment is stirring in the treatment tank,
Microorganisms or nutrients are more evenly dispersed in the treatment tank.

Further, the wastewater treatment apparatus may add both nutrients and microorganisms to the treatment tank. In the most preferable form, the wastewater treatment device is used for several days after adding the nutrients to COD.
Check the change in the value, and add the microorganism if the degree of decrease in the activity of the microorganism is not recovered. At this time, the wastewater treatment device may dilute the wastewater if the reduction of the COD value is not recovered even if the microorganism is further added. As a result, the wastewater treatment device can reliably discharge the wastewater having a reduced COD value. Next, a wastewater treatment apparatus having a two-tank type treatment tank will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a wastewater treatment apparatus 10 according to this embodiment. The wastewater treatment device 10 includes a regulating tank 10
0, the first COD measuring unit 110, and the first processing tank 20.
0, the second COD measuring unit 250, and the second processing tank 30.
0, the third COD measuring unit 350, the sludge tank 400,
And a diluting unit 460.

The adjusting tank 100 adjusts the wastewater and transfers it to the first processing tank 200. For example, the adjustment tank 100 adjusts the flow rate, pH, and temperature of the wastewater so as to be suitable for the microorganism contained in the first treatment tank 200.

First processing tank 200 and second processing tank 30
The capacity of 0 depends on the amount of waste water. For example, the capacities of the first treatment tank 200 and the second treatment tank 300 are such that the residence time of the wastewater is about 0.2 to 20 days for the first treatment tank 200 and the second treatment tank 300 in total. Adjusted. In particular, the capacities of the first treatment tank 200 and the second treatment tank 300 are such that the residence time of the waste water is 0.5 to 5 days for the first treatment tank 200 and the second treatment tank 300 in total. It is preferably adjusted. The wastewater is moved to the second treatment tank 300 when it stays in the first treatment tank 200 for a predetermined period, and is moved to the sludge tank 400 when it stays for a further predetermined period.

First processing tank 200 and second processing tank 30
At 0, microorganisms are added. The added microorganism decomposes the hardly biodegradable substance contained in the wastewater.

The microorganisms contained in the first treatment tank 200 are acclimated to wastewater having a higher concentration than the microorganisms contained in the second treatment tank 300. For example, the first processing tank 200 is
It contains microorganisms acclimated to wastewater with a COD concentration of 0.5 g / l to 20 g / l. On the other hand, the second processing tank 300
Contains microorganisms acclimated to wastewater having a COD concentration of 0.3 g / l to 14 g / l. In the present embodiment, the first
The microorganisms contained in the treatment tank 200 of Bacillus are
editabidus-1 with polypeptone 0.5
%, Yeast extract 0.1%, Cu-EDTA 0.1%, 1
A conditioned medium was obtained by carrying out stationary culture at 37 ° C. for 7 days in a culture solution of / 30 M phosphate buffer (500 ml), pH 6.0. The microorganisms contained in the second treatment tank 300 are
Bacillus editabidus-1, polypeptone 0.5%, yeast extract 0.1%, Cu-EDT
A 0.01%, 1/30 M phosphate buffer 500 ml, p
It is acclimated by performing static culture in a culture solution of H6.0 at 37 degrees for 7 days. In the present embodiment, the microorganism is added while being immobilized on the carrier.

The first COD measuring section 110 is used in the adjusting tank 10.
Before the wastewater is transferred from 0 to the first treatment tank 200, the COD concentration of the wastewater is measured. The first COD measurement unit 110 is
For example, it is installed near the inlet of the waste water of the first treatment tank 200. Further, the first COD measuring unit 110 may be installed in the adjusting tank 100, and COD of the wastewater before the addition of the microorganisms.
It may be arranged at a position where the concentration can be measured.

The second COD measuring section 250 measures the COD concentration of the waste water immediately before the waste water is transferred from the first treatment tank 200 to the second treatment tank 300. The second COD measurement unit 250 is installed, for example, in the vicinity of the waste water inlet of the second treatment tank 300. In addition, the second COD measuring unit 250 is
May be installed in the treatment tank 200 or the second treatment tank 300, and is placed at a position where the COD concentration of the wastewater can be measured immediately before or immediately after the wastewater is transferred from the first treatment tank 200 to the second treatment tank 300. If you have.

The third COD measuring section 350 measures the COD concentration of the waste water when the waste water is transferred from the second treatment tank 300 to the sludge tank 400. Third COD measuring unit 350
Is installed near the outlet of the waste water of the second treatment tank 300. In addition, the third COD measuring unit 350 is used in the second processing tank 3
00 or the sludge tank 400, as long as the COD concentration of the waste water after being treated in the second treatment tank 300 can be measured.

The first processing tank 200 is further provided with an addition section 21.
0, a pH adjusting unit 220, a stirring unit 230, and a filter 240. The pH adjuster 220 measures the pH of the wastewater in the first treatment tank 200 and adjusts it to a preset pH value. Here, the pH adjusting unit 220
Is a p suitable for the microorganism added to the first treatment tank 200.
Adjust to H. The pH adjuster 220 has, for example, a pH of 6.
The waste water in the first treatment tank 200 is adjusted so as to be about 0. The stirring unit 230 stirs the waste water in the first processing tank 200. The stirring unit 230 may stir the wastewater with a mechanical device. In the present embodiment, the stirring unit 230
Stirs the wastewater by aeration. Filter 24
0 separates the waste water from the carrier and the waste water in which the microorganisms are immobilized in the first treatment tank 200.

The adding section 210 adds the nutrients of the microorganism to the first treatment tank 200 when the ability of decomposing the microorganism is lowered. Specifically, when the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 is lower than a predetermined value, the adding unit 210 determines that the COD concentration is lower than the predetermined value. Then, a nutrient consisting of a carbon source, a nitrogen source or an organic nutrient inorganic salt suitable for the growth of microorganisms is added to the first treatment tank 200. As the organic nutrient source, for example, polypeptone, yeast extract, meat extract, molasses, etc. are added. As the inorganic nutrient source, for example, various phosphates and magnesium salts are added. Here, the addition unit 210 is
An organic nutrient source of 0.001 to 5 wt% / volume and an inorganic nutrient source of 0.1 to 1 wt% / volume of the organic nutrient source are added. More preferably, the addition part 210 is 0.01 to 1 w.
t% / volume of organic nutrient source and 0.1 to 100% of the organic nutrient source.
Add 1 wt% / volume of inorganic nutrient source.

Further, the addition section 210 is arranged such that after adding the nutrients of the microorganism, the first C is kept for a certain period of time, for example, after 30 days.
The COD concentration measured by the OD measuring unit 110 and the second CO
When the difference from the COD concentration measured by the D measurement unit 250 is lower than a predetermined value, the microorganism itself that decomposes the hardly biodegradable substance contained in the wastewater is added to the first treatment tank 200.

In this case, the addition section 210 adds 10 g or more and 50 kg or less of dry weight of microorganisms to the first treatment tank 200 per cubic meter of wastewater. More preferably,
The addition unit 210 uses a dry weight of 20 g or more and 5000 g or less of microorganisms per cubic meter of wastewater in the first treatment tank 20.
Add to 0.

That is, in the present embodiment, first, the addition section 210 adds the nutrients to the first treatment tank 200. Then, after a certain period of time has passed, the COD concentration measured by the first COD measuring unit 110 and the second COD measuring unit 2 are further measured.
When the difference from the measured COD concentration of 50 is lower than a predetermined value, the microorganism is added to the first treatment tank 200, but instead of this, the nutrient is not added, and When the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 is lower than a predetermined value, the microorganism is added to the first treatment tank 200. You may.

The COD concentration measured by the first COD measuring section 110 and the second C before the addition of the nutrients
The “predetermined value” as a comparison target for the difference with the COD concentration measured by the OD measurement unit 250, the COD concentration measured by the first COD measurement unit 110 after adding the nutrient, and the second C measured by the COD measuring unit 250
The “predetermined value” as a comparison target for the difference with the OD concentration may be the same value or different values.

The second processing tank 300 includes an addition section 310,
pH adjuster 320, agitator 330, and filter 340
Have and. The addition unit 310 adds the nutrients of the microorganisms to the second treatment tank 300 when the ability of decomposing the microorganisms in the second treatment tank 300 decreases. Specifically, the addition unit 31
0 is suitable for the growth of microorganisms when the difference between the COD concentration measured by the second COD measuring unit 250 and the COD concentration measured by the third COD measuring unit 350 is lower than a predetermined value. A nutrient composed of a carbon source, a nitrogen source or an organic nutrient source inorganic salt is added to the second treatment tank 300.

Further, the addition section 310, even after adding the nutrients of the microorganisms, shows the difference between the COD concentration measured by the second COD measurement section 250 and the COD concentration measured by the third COD measurement section 350. When it is lower than a predetermined value, the microorganism itself that decomposes the organic aminocarboxylic acid contained in the wastewater is added to the first treatment tank 200.

Since the nutrients and microorganisms to be added to the second treatment tank 300 are almost the same as the nutrients and microorganisms to be added to the first treatment tank 200, the description thereof will be omitted.
Further, the pH adjusting unit 320, the stirring unit 330, and the filter 3
Regarding the operation and configuration of 40, the pH adjusting unit 2 is also provided.
The operations and configurations of the stirring unit 230, the stirring unit 230, and the filter 240 are almost the same, and thus the description thereof is omitted.

The sludge tank 400 stores the sludge contained in the second treatment tank 300, and drains the supernatant of the waste water to the outside. Further, the sludge tank 400 may complement the decomposition processing in the first processing tank 200 and the second processing tank 300. That is, the sludge tank 400 may decompose and remove organic substances and inorganic substances that could not be treated in the first treatment tank 200 and the second treatment tank 300.

Further, the sludge tank 400 has an adjusting section 420, an aeration section 430, and a drainage pump 450. Adjustment unit 4
20 injects into the sludge tank 400 a neutralizing agent for neutralizing the wastewater, a nutrient for the microorganisms in the sludge tank 400, and the like. Aeration section 43
0 is aeration. The drainage pump 450 drains the supernatant of the wastewater in the sludge tank 400 to the outside. Drainage pump 450
May have a drainage inspection unit. The drainage inspection unit inspects the amount of the liquid content drained by the drainage pump 450. The diluting unit 460 dilutes the wastewater drained by the drainage pump 450 with dilution water.

FIG. 1 exemplifies a two-tank type decomposition tank. Of course, if the COD in the waste water to be treated is low, one tank type may be used and a tank having a sufficiently large capacity can be set. In such cases, it may be a single tank.

FIG. 2 is a flow chart showing the wastewater treatment method according to this embodiment. Here, a wastewater treatment method for the first treatment tank 200 will be described. First, the wastewater treatment device 10 calculates the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 (S100). Next, the wastewater treatment device 10
When the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 is lower than a predetermined value (S10
2) Add nutrients to the first treatment tank 200 (S10)
4).

Next, the wastewater treatment device 10 calculates the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 (S1).
06). The wastewater treatment device 10 regularly performs the operation of S106 until a predetermined period of time elapses after the nutrient is added (S108). The wastewater treatment device 10 includes a first COD measuring unit 11 when a predetermined period of time has passed since the nutrient was added.
The COD concentration measured by 0 and the second COD measuring unit 250
It is determined whether the difference from the measured COD concentration is lower than a predetermined value (S110). Wastewater treatment device 10
When it is determined that the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 is lower than a predetermined value,
Microorganisms are added to the first treatment tank 200 (S112).

Next, the wastewater treatment apparatus 10 calculates the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 (S1).
14). The wastewater treatment device 10 periodically performs the operation of S114 until a predetermined period has elapsed since the microorganism was added (S116). The wastewater treatment device 10 uses the first COD measurement unit 1 when a predetermined period has passed since the microorganism was added.
COD concentration measured by 10 and the second COD measuring unit 25
It is determined whether the difference between 0 and the measured COD concentration is lower than a predetermined value (S118). Next, the wastewater treatment device 10 measures the COD measured by the first COD measuring unit 110.
When it is determined that the difference between the concentration and the COD concentration measured by the second COD measuring unit 250 is lower than a predetermined value, the wastewater is diluted (S120).

On the other hand, S102, S110, and S118
In the wastewater treatment device 10, the first COD measuring unit 1
COD concentration measured by 10 and the second COD measuring unit 25
When it is determined that the difference between 0 and the measured COD concentration is equal to or more than the predetermined value, the process jumps to S100.

Since the wastewater treatment method for the second treatment tank 300 is the same as the wastewater treatment method for the first treatment tank 200, its explanation is omitted.

FIG. 3 shows S100 and S10 in FIG.
6 is a flowchart showing detailed operations of S6 and S114. The first COD measurement unit 110 measures the COD concentration of wastewater (S200). Next, the waste water is treated in the first treatment tank 20.
Moved to 0. The 1st processing tank 200 decomposes | disassembles the organic substance contained in wastewater using a microorganism (S202). Next, the second COD measuring unit 250 measures the COD concentration of wastewater (S204). Next, the wastewater treatment device 10 uses S200.
At, the difference between the COD concentration measured by the first COD measuring unit 110 and the COD concentration measured by the second COD measuring unit 250 at S204 is calculated (S206). Next, the present invention will be described using examples.

(Example 1) Table 1 shows the composition of 500 ml of a culture solution of a microorganism containing a copper complex of EDTA. EDTA
500 ml of the culture solution containing the copper complex of 1. is sterilized in an autoclave at 120 ° C. for 20 minutes. Then, the sterilized culture solution was inoculated with the microorganism Bacillus editabidus-1 and statically cultured at 37 ° C. for 7 days.

Table 2 shows the composition of the model waste liquid for electroless plating. As the waste water, a model waste liquid having the composition shown in Table 2 was prepared. The COD concentration of this model waste liquid was 300 ppm. The model waste liquid shown in Table 2 was put into a 2 L beaker, and the beaker bottom was replenished with the model waste liquid at a rate of 20 ml / hour while gently stirring. The overflowed model effluent was collected periodically for COD analysis.
Microorganisms acclimated with the culture solution having the composition shown in Table 1, that is, Ba
Cillus editabidus-1 was added to 400 mg dry weight of the model effluent.

Table 3 shows that after the addition of the microorganism, 10 days, 20 days,
The COD concentration of the discharged liquid after 30 days and 60 days is shown. In the wastewater treatment apparatus 10 according to this embodiment, the COD concentration of the input liquid, that is, the COD concentration measured by the first COD measuring unit 110, and the COD concentration of the discharge liquid, that is, the second COD measuring unit 2
Nutrients are added to the wastewater when the difference from the measured COD concentration of 50 is less than 200 ppm. Here, the wastewater treatment device 10 comprises 20 g of yeast extract and polypeptone 2
0 g and nutrients are added to the wastewater. As shown in Table 3, since the difference between the COD concentration of the input liquid and the COD concentration of the discharge liquid was 180 ppm after 60 days had passed, the nutrient was added to the model waste liquid.

Table 4 shows that immediately after addition of nutrients, 10 days, 20 days,
The COD concentration of the effluent after 30 days and 60 days is shown. As shown in Table 4, the COD concentration of the discharged liquid decreased again. That is, the added microorganisms were reactivated by adding nutrients.

(Example 2) In Example 1, the microorganism itself was added to the model waste liquid, but instead of this, in Example 2, the microorganism supported on the polymer gel (KP Pearl Kansai Paint) was added. . Further, in Example 1, the nutrient was added when the ability of the microorganism to decompose EDTA decreased, but in Example 2, the loaded microorganism was added instead. Other compositions of the culture solution and the model waste solution are the same as in Example 1, and thus the description thereof is omitted. As the carrier for supporting the microorganism, a spherical entrapping immobilization carrier having a particle diameter of 3 mm was used.

Table 5 shows that after the addition of the microorganism, 10 days, 20 days,
The COD concentration of the discharged liquid after 30 days and 60 days is shown. From the COD concentration of the effluent shown in Table 3 of Example 1, the COD concentration of the effluent shown in Table 5 is lower than the COD concentration of the effluent shown in Table 3 of Example 1, indicating that the microorganism itself. COD is more efficiently reduced in the present experiment in which the supported microorganisms are added than in the method in which COD is added, which is a preferred embodiment. As shown in Table 5, after 60 days, the difference between the COD concentration of the input liquid and the COD concentration of the discharge liquid was 1
Since it was 92 ppm, the supported microorganism was added to the model waste liquid.

Table 6 shows that 20 days immediately after the addition of the microorganism, 20 days
The COD concentration of the effluent after days, 30 days, and 60 days is shown. As shown in Table 6, the COD concentration of the discharged liquid decreased again.

Although the present invention has been described using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements can be added to the above-described embodiment. A mode in which such changes or improvements are added may be included in the technical scope of the present invention.
It is clear from the description of the claims.

[0063]

As is apparent from the above description, according to the present invention, it is possible to provide a wastewater treatment method which is low in cost and reduces the total amount of hardly biodegradable substances contained therein.

[Brief description of drawings]

FIG. 1 is a schematic view of a wastewater treatment device 10.

FIG. 2 is a flowchart showing a wastewater treatment method according to the present embodiment.

3 is S100, S106, and S11 in FIG.
4 is a flowchart showing a detailed operation of No. 4.

[Table 1] 500 culture medium of microorganism containing copper complex of EDTA
It is a table showing composition of ml.

[Table 2] A table showing the composition of a model waste liquid of electroless plating.

[Table 3] 10 days, 20 days, 30 days, 60 after addition of microorganisms
It is a table which shows the COD density | concentration of the discharged liquid which passed.

Table 4 is a table showing the COD concentration of the discharged liquid 10 days, 20 days, 30 days, and 60 days after the addition of nutrients.

[Table 5] 10 days, 20 days, 30 days, 60 after addition of microorganisms
It is a table which shows the COD density | concentration of the discharged liquid which passed.

Table 6 is a table showing the COD concentration of the discharged liquid 10 days, 20 days, 30 days, and 60 days after the addition of the microorganism.

[Explanation of symbols]

10 Wastewater treatment equipment 100 adjusting tank 110 First COD measurement unit 200 First treatment tank 210 Addition Department 220 pH adjuster 230 Stirrer 240 filters 250 Second COD measuring unit 300 Second treatment tank 310 Addition Department 320 pH adjuster 330 Stirrer 340 filter 350 Third COD measurement unit

[Procedure amendment]

[Submission date] May 28, 2002 (2002.5.2)
8)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

A resolution means for] That is, according to a first embodiment of the present invention, there is provided a waste water treatment apparatus for treating wastewater using a particular compound degradable microorganisms, the concentration specified compound before treatment The difference information acquisition unit that acquires difference information indicating the difference between the corresponding value and the processed value, and the difference specified by the difference information acquired by the difference information acquisition unit are less than or equal to a predetermined value. In this case, an addition unit for adding at least one of the microorganisms and nutrients for the microorganisms to the treatment tank is provided.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

According to a third aspect of the invention, there is provided a waste water treatment apparatus for treating wastewater using a particular compound degradable microorganisms, and values corresponding to the concentration the specific compound before treatment,
Difference information acquisition unit that acquires the difference information indicating the difference between the value after processing, and the difference specified by the difference information acquired by the difference information acquisition unit is a predetermined value or less, for microorganisms And an addition unit for adding the nutrients of 1. to the treatment tank.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

According to a fifth aspect of the present invention, there is provided a waste water treatment apparatus for treating wastewater using a particular compound degradable microorganisms, and values corresponding to the concentration the specific compound before treatment,
Difference information acquisition unit that acquires the difference information indicating the difference between the value after processing, and the difference specified by the difference information acquired by the difference information acquisition unit, when the microorganism is less than or equal to a predetermined value, An addition unit for adding to the treatment tank.

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Claims (2)

[Claims] 1. A wastewater treatment device for treating wastewater using microorganisms capable of degrading specific microorganisms, the difference information indicating a difference between a value corresponding to the concentration of a specific compound before the treatment and the value after the treatment. And a difference information acquisition unit that acquires the difference information specified by the difference information acquired by the difference information acquisition unit is less than or equal to a predetermined value, at least one of the microorganisms and nutrients for the microorganisms. A wastewater treatment device, comprising: 2. A wastewater treatment method for treating wastewater using a microorganism capable of degrading a specific compound, wherein a difference indicating a difference between a value corresponding to the concentration of the specific compound before the treatment and the value after the treatment is provided. The wastewater treatment method is characterized in that at least one of the microorganisms and nutrients for the microorganisms is added to a treatment tank when the difference is equal to or less than a predetermined value.