JP4529667B2 - Purification method and additive for contaminated soil and contaminated water - Google Patents

Description

  The present invention relates to a contaminated soil / polluted water purification method and an additive for purifying contaminated soil / polluted water contaminated with an organic halogen compound by anaerobic microorganisms.

  In recent years, as a purification method to purify contaminated soil and contaminated water contaminated with organic halogen compounds with anaerobic microorganisms, organic acids such as lactose and polylactic acid esters, which are electron donors, are added to the contaminated soil and contaminated water. (See, for example, Patent Documents 1 and 2).

And according to such a conventional technique, it becomes possible to purify contaminated soil and contaminated water by the reductive dehalogenation reaction by anaerobic microorganisms.
JP 2003-251331 A Japanese Patent No. 3538643

  However, there is a problem that the conventional purification method for contaminated soil and contaminated water has a slow purification rate. Moreover, since the conventional additive is expensive, there also exists a problem that the purification cost is high.

  The present invention has been made in view of the above points, and provides a method for purifying contaminated soil and contaminated water and an additive capable of improving the purification rate of contaminated soil and contaminated water and reducing the purification cost. The purpose is to do.

In order to solve the above problems, the present invention has been contaminated soil and contaminated water contaminated by organic halogen compounds, have a degrading activity of the organic halogen compounds, anaerobic microorganisms present in the contaminated soil and the contaminated water A method for purifying contaminated soil and / or contaminated water, wherein gluconic acid derivatives such as gluconic acid and gluconate, gluconic acid amide, gluconic acid ester, and gluconic anhydride are added to the contaminated soil and / or the contaminated water. Of these, an additive containing at least one of them is added.

In order to solve the above problems, the present invention has been contaminated soil and contaminated water contaminated by organic halogen compounds, have a degrading activity of the organic halogen compound is present in said contaminated soil and the contaminated water anaerobic A method for purifying contaminated soil and / or contaminated water to be purified by a microorganism, wherein the contaminated soil and / or the contaminated water contains glucones such as gluconic acid and gluconate, gluconate amide, gluconate ester, gluconate anhydride, etc. An additive containing at least one of acid derivatives is added as a hydrogen donor, and the anaerobic microorganism is activated by an organic acid generated in an anaerobic environment .

In order to solve the above problems, the present invention has been contaminated soil and contaminated water contaminated by organic halogen compounds, have a degrading activity of the organic halogen compound is present in said contaminated soil and the contaminated water anaerobic A method for purifying contaminated soil and / or contaminated water to be purified by a microorganism, wherein the contaminated soil and / or the contaminated water contains glucones such as gluconic acid and gluconate, gluconate amide, gluconate ester, gluconate anhydride, etc. An additive containing at least one of acid derivatives is added as a hydrogen donor, and the anaerobic microorganism is activated by an organic acid generated in an anaerobic environment without aeration .

The additive preferably contains at least one or more of sodium gluconate, potassium gluconate, and calcium gluconate as a main component, and also contains a nitrogen source and a phosphorus source. The weight ratio (%) of C: N: P contained in the additive is preferably 34: 3: 0.3. Moreover, in the said purification method, it is preferable to add a pH adjuster to at least 1 among contaminated soil, contaminated water, and an additive.

  Moreover, this invention is an additive used for the purification method of said contaminated soil and contaminated water, It is characterized by the above-mentioned.

  According to the present invention, it is possible to improve the purification speed of contaminated soil / contaminated water and reduce the purification cost.

  Hereinafter, the best mode for carrying out the method for purifying contaminated soil and contaminated water according to an embodiment of the present invention will be described.

  First, in purifying contaminated soil and contaminated water contaminated with an organic halogen compound by anaerobic microorganisms, the present invention provides gluconic acid and gluconate, gluconic acid amide, and gluconic acid ester to contaminated soil and / or contaminated water. And an additive containing at least one of gluconic acid derivatives such as gluconic acid anhydride.

  In the present invention having the above structure, the organic halogen compound is a compound in which hydrogen of an aliphatic hydrocarbon or aromatic hydrocarbon is substituted with a halogen (for example, fluorine, chlorine, bromine, iodine, etc.). Examples of the compound include aliphatic organic chlorine compounds such as tetrachloroethylene (PCE), trichloroethylene (TCE), cis-1,2-dichloroethylene (cis-1,2-DCE), and vinyl chloride (VC).

  The above-mentioned anaerobic microorganisms are anaerobic microorganisms having the activity of decomposing organic halogen compounds. Examples of such anaerobic microorganisms include the genus Methanobacterium, the genus Methanosarcina, and the methanolobus ( Anaerobic archaea such as Methanolobus, Acetobacterium, Desulfobacterium, Desulfomonile, Dehalospirillum, Dehalobacter, Dehalobacter (Dehalobacter) Examples include the genus Dehalobacterium, the genus Dehalococcoides, and the genus Clostridium.

  Moreover, said additive contains at least 1 or more types among gluconic acid and a gluconic acid derivative, improves the decomposition activity of the organic halogen compound by an anaerobic microorganism, and accelerates | stimulates the dehalogenation reaction of an organic halogen compound. Function as a hydrogen donor. That is, tetrachloroethylene (PCE), which is an organic halogen compound, acquires growth energy (ATP) by a reductive dehalogenation reaction using hydrogen as an electron donor and PCE as an electron acceptor. “Organic halogen respiration (dehalogenated respiration) ) Fungus "to be decomposed into trichlorethylene (TCE). Furthermore, trichlorethylene (TCE) is decomposed into cis-1,2-dichloroethylene (cis-1,2-DCE) and finally detoxified by being decomposed into ethylene. Since the supply of hydrogen is indispensable for activating the anaerobic microorganism, an additive containing gluconic acid and a gluconic acid derivative as a hydrogen donor is added to the contaminated soil / contaminated groundwater. Examples of the gluconic acid derivative include gluconate, gluconate amide, gluconate, gluconic anhydride, etc. Among these gluconate derivatives, gluconate is preferable.

  As said additive, while containing at least 1 or more types among sodium gluconate, potassium gluconate, and calcium gluconate as a main component, what contains a nitrogen source and a phosphorus source is preferable, and contains a pH adjuster. It may be a thing.

Sodium gluconate (hereinafter referred to as “sodium gluconate”) has very low toxicity as recognized as a food additive, and is widely used for industrial purposes such as chelating agents, so it is very inexpensive. It is. For this reason, sodium gluconate is excellent in safety and excellent in reducing purification costs. Furthermore, the molecular formula of sodium gluconate is C ₆ H ₁₁ O ₇ Na, which is also excellent in that it is readily decomposed and absorbed as a carbon source for growing anaerobic microorganisms.

  Further, the nitrogen source and the phosphorus source are nutrient sources necessary for growing anaerobic microorganisms together with the carbon source, and it is preferable to use a mixture of sodium gluconate and a nitrogen source and a phosphorus source as the additive. . The mixing ratio of the nitrogen source and the phosphorus source is such that nitrogen (N) is 1/10 to 1/20 of the carbon (C) of sodium gluconate, and phosphorus (P) is the carbon (C) of sodium gluconate. The amount is 1/100 to 1/200. However, when nitrogen or phosphorus is contained in advance in the groundwater to be purified, only sodium gluconate may be added. The weight ratio (%) of C: N: P contained in the additive is preferably 34: 3: 0.3. At this time, materials used as a nitrogen source and a phosphorus source are not particularly limited. For example, urea is used as a nitrogen source, potassium dihydrogen phosphate is used as a phosphorus source, and each is 6% with respect to sodium gluconate, If 1% is mixed, the blending ratio (weight ratio) of C: N: P is 34 (%): 3 (%): 0.3 (%).

  Moreover, when the additive containing a hydrogen donor is added to the contaminated soil / contaminated groundwater as described above, it may be acidified due to the nature of the contaminated soil / contaminated groundwater. Therefore, in such a case, in order to maintain neutral conditions, it is preferable to add a pH adjuster to the contaminated soil / contaminated groundwater. The pH adjuster may be added to the additive as well as the contaminated soil / contaminated groundwater. Examples of such pH adjusters include alkali metal compounds, alkaline earth metal compounds, and the like, for example, potassium phosphate, calcium phosphate, calcium sulfate, magnesium oxide, bennite, zeolite, limestone, slaked lime, quicklime, etc. It may be added as a solution or as a powder. As a water-soluble pH adjuster, in addition to sodium phosphate, sodium hydroxide, and sodium carbonate, for example, a pH buffer solution in which sodium hydrogen phosphate and potassium hydrogen phosphate are mixed may be used.

  Examples of the present invention will be described below.

=== In-house test ===
First, in this laboratory test, VOC (volatile organic chlorine compound) actual contaminated soil and local groundwater were used as test samples, and an additive containing sodium gluconate as a hydrogen donor was used. The culture conditions at that time were stationary culture at 25 ° C. and stirring at a rate of once a week. The VOC concentration analysis was conducted by sampling the headspace gas and analyzing the VOC by GC (Dry-ELCD), and then periodically crushing the specimen to perform physicochemical analysis such as pH, ORP, and TOC. In this laboratory test, the decomposition rate of VOC was compared between the case where sodium gluconate was added alone and the case where a mixture of nitrogen source and phosphorus source was added to sodium gluconate. In addition, the addition density | concentration of the additive was shown by weight% with respect to the total amount of soil and groundwater. The test results are shown in FIG.

  FIG. 1 is a graph showing the results of this laboratory test, (a) is a graph showing the decomposition rate of VOC when sodium gluconate is added alone, and (b) is a graph showing the nitrogen source and phosphorus in sodium gluconate. It is a graph which shows the decomposition | disassembly rate of VOC at the time of adding what mix | blended the source | sauce.

  As shown in FIG. 1 (a), when sodium gluconate is added to the above test sample alone, PCE and TCE which are VOCs are decomposed within one week after the addition of sodium gluconate. cis-1,2-DCE. The cis-1,2-DCE was completely decomposed after 145 days.

  On the other hand, as shown in FIG. 1 (b), when a mixture of a nitrogen source and a phosphorus source in sodium gluconate was added to the above test sample, compared with the case where sodium gluconate was added alone, In particular, the decomposition rate of cis-1,2-DCE was increased.

  That is, the period until cis-1,2-DCE falls below the environmental standard value was about 145 days when sodium gluconate was added alone, but the nitrogen source and phosphorus source were added to sodium gluconate. When the blend was added, it was 120 days. By blending a nitrogen source and a phosphorus source, the number of days of degradation of cis-1,2-DCE was shortened by about one month.

=== Injection concentration and injection method ===
Next, an injection concentration and an injection method when the additive is injected into the ground in the original position will be described.

  Since the additive of this example contains sodium gluconate as a main component, it has a high solubility in water (solubility of sodium gluconate: 59 g / 100 ml) and is easily decomposed. For this reason, when an additive is injected into the ground in a high concentration state, the additive is decomposed and a high concentration of hydrogen is supplied to inhibit the growth of anaerobic microorganisms. Therefore, it is necessary to dilute the additive when injecting into the ground. In the case of excavation purification, the excavated soil containing the anaerobic microorganisms is cured by slurrying or mud. The additive concentration in this case is such that the pore water concentration is approximately 0.04 to 1.3%.

  FIG. 2 is a graph showing the relationship between the amount of additive added and the change over time in the VOC concentration, and the additive concentration is expressed in weight% with respect to the total amount of soil and groundwater. (A) shows the VOC change in the control group, (b) shows the VOC change at the addition concentration of 0.025%, (c) the addition concentration 0.05%, (d) the addition concentration 0.1%, (E) shows a change in VOC at an addition concentration of 0.2%, (f) shows an addition concentration of 0.4%, and (g) shows a change in VOC at an addition concentration of 1%. As the additive, one containing not only sodium gluconate but also a nitrogen source and a phosphorus source was used (hereinafter referred to as “Na + gluconate Na + N, P”).

  As shown in FIG. 2, in the case of the control group to which no additive was added, even if 120 days had elapsed since the addition of the additive, none of the VOC concentrations fell below the environmental standard value ( (See FIG. 2 (a)). On the other hand, when the addition concentration is 0.025%, 0.05%, 0.1%, 0.2%, 0.4%, the standard is All defined VOC concentrations were below the environmental standard value (see FIGS. 2B to 2F). Even in the case of 1%, after about 150 days, the VOC concentrations were all below the environmental standard value (see FIG. 2 (g)).

  Although there is no environmental standard value for VC, it is said that it is more toxic than PCE and TCE, so it is desirable to decompose as much as possible (in this example, as a temporary standard value for VC concentration, Less than 0.005 mg / l). At addition concentrations of 0.025%, 0.05%, 0.1%, and 0.2%, it was confirmed that they were decomposed to the detection limit by 120 days, but 0.4% and 1.0%. Then, VC was detected after 150 days, and the purification rate tended to be slower as the addition concentration increased. The addition concentration of 0.025% to 1% corresponds to approximately 0.04 to 1.3% in terms of groundwater concentration, and it can be said that the VOC purification effect is recognized within this range. However, addition of 0.5% or more has a slow purification rate. From the above, when injecting the additive into the ground in the original position, it is desirable to inject the additive diluted by about 0.04 to 1.0%.

  By the way, as a method of diluting the additive as described above, the following dilution method is efficient. That is, a high concentration solution of 30% is first prepared and diluted with tap water and stored. The diluted solution can be stored for about one week. The 30% concentration solution thus prepared is diluted to an appropriate concentration (0.04 to 1.0%) with pumped water or groundwater and poured into the ground. When diluted with pumped water or groundwater, the low-concentration diluted solution may be decomposed immediately, so it is desirable to inject it into the ground within the same day. By performing dilution in two stages as described above, a small injection tank can be used.

  Moreover, as an injection | pouring method for inject | pouring an additive into the ground of an original position, there exists the method of (A)-(D), for example. First, there is a method in which (A) an additive is dissolved in ground water or industrial water, and this solution is continuously injected into an injection well installed in an aquifer of a purification target range contaminated with VOC, and the aquifer is filled with the solution. is there. In addition, (B) the injection well installed in the aquifer in the purification target area is suspended by filling the water-permeable pack with the additive, so that the additive is dissolved in the groundwater passing through the injection well and diffused into the ground. There is also a way to make it. The number and shape of the additive pack are adjusted so that the concentration of the diffused additive in the groundwater is 0.025 to 1%. Periodically replace packs filled with additives. Furthermore, there is a method in which (C) the additive solution is pressed into the aquifer in the range to be purified by a grout apparatus or the like. The solution injected by this method gradually dilutes and diffuses due to the flow of groundwater in the aquifer. In addition, the density | concentration of the additive solution to press-fit is adjusted so that the density | concentration of the diffused additive may be 0.025 to 1% in the ground. Further, (D) in the ground having relatively poor water permeability, there are the following methods. That is, in the shallow aquifer, the aquifer to be purified and the additive solution are mixed by shallow mixing mechanical stirring or high-pressure jet stirring, while in the deep aquifer, by deep-mixing mechanical stirring or high-pressure jet stirring. In this method, the aquifer to be purified and the additive solution are mixed. The shallow layer mixing machine includes a backhoe with a stirring attachment, and the deep layer mixing machine includes an auger. Examples of the high-pressure jet stirring method include CCP (Chemical-Churning-Pile). In this construction method, an additive is mixed with the ground by spraying from a monitor attached to the tip of a rod, and rotating and pulling up.

=== Addition of pH adjusting agent ===
Next, the addition of a pH adjuster will be described. As a form of adding the pH adjuster to the ground, there are a case where the additive is added to the ground at the same time (initial addition) and a case where the additive is added after the additive is added (separate addition). .

<Initial addition of pH adjuster>
Since the organic acid is generated in the process of anaerobically decomposing the additive of this example, the pH is inclined to the acidic side. When the pH is inclined toward the acidic side, the microbial activity is inhibited, and thus it takes a long time to purify the VOC. Therefore, when diluting the additive in water, it is desirable to adjust the pH to 8 to 9 in advance (initial addition).

  The material used for pH adjustment is disodium hydrogen phosphate, and the amount added is equivalent to 15 to 30% of the amount of additive added. Disodium hydrogen phosphate aqueous solution is weakly alkaline and easy to handle, and phosphoric acid can be used as a nutrient for anaerobic microorganisms.

  Furthermore, in the present Example, the laboratory test was implemented about the purification effect of this pH adjuster. The test results are shown in FIG. In this laboratory test, disodium hydrogen phosphate and dipotassium hydrogen phosphate were mixed, and adjusted to pH 7 and pH 8 were added to the ground simultaneously with the additives. Thus, by mixing disodium hydrogen phosphate and dipotassium hydrogen phosphate, a pH buffering effect can be expected as compared with the case where disodium hydrogen phosphate is used alone.

  FIG. 3 is a graph showing the change over time in the VOC concentration when the pH adjuster was initially added. (A) shows the VOC change in the control group, and (b) is the pH adjuster added group (pH: 7). ) Shows the change in VOC, and (c) shows the change in VOC in the pH adjuster addition group (pH: 8).

  As shown in FIG. 3, in the case of the control group in which an additive (Na + N gluconate, P: 0.2%) is added but no pH adjuster is added, the VOC concentration is below the reference value. It took about 120 days (4 months) after the additive was added (see FIG. 3A). On the other hand, in the case of the pH adjuster addition section in which the pH adjuster was added together with the additive, the VOC concentration became below the reference value after about 60 days (2 months) (FIG. 3 (b) ) And (c)).

  From this, it can be said that by adding the pH adjuster, the period until the VOC concentration becomes equal to or lower than the reference value is shortened by about two months, and the VOC purification rate is improved.

  In addition, FIG. 4 is a graph which shows the pH change in each test section. As shown in FIG. 4, when pH adjustment was not performed, that is, when no pH adjuster was added, the pH after 14 days had dropped to 6.0. In contrast, when the pH was adjusted, that is, when the pH adjusting agents (pH 7 and 8) were initially added, the pH showed a value of 6.3 or more.

  By the way, in this laboratory test, a mixed solution of disodium hydrogen phosphate and dipotassium hydrogen phosphate was used in order to provide pH buffering capacity. In addition, it is possible to use only disodium hydrogen phosphate which is an alkaline agent. In that case, the addition amount of the pH adjusting agent is such that the pH becomes 8-9 when the additive is diluted with water, and as a measure of such addition amount, it corresponds to 15-30% of the additive addition amount. Amount.

<Additional addition of pH adjuster>
Moreover, as a pH adjustment method, when adding an additive to the ground of an in-situ, it may add separately after adding an additive other than adding simultaneously with this. That is, depending on the ground, there is soil with a high pH of the ground itself or a high pH buffering capacity, and it may not be necessary to mix a pH adjusting agent in advance. Therefore, the pH of groundwater is monitored during microbial treatment, and when the pH falls below 6.3, a pH adjuster is added separately to adjust the pH to around neutral (7.0 to 7.5). Return to Table 1 shows the relationship between the addition amount of the additive and the VOC decomposition rate, and the influence of the addition of the pH adjusting agent.

  Table 1 is a table showing the relationship between the addition amount of the additive and the VOC decomposition rate, and the influence of the addition of the pH adjusting agent. As shown in Table 1, when the additive amount is 0.025%, 0.05%, 0.1%, cis-1,2-DCE is less than the environmental standard value after 60 days (<0 0.04 mg / l), on the other hand, VC was below the reference value after 90 days (<0.005 mg / l).

  On the other hand, when the addition amount of the additive is 0.2% and 0.4%, 120 days (0.2% addition) and 145 days or more (0. 4% addition) was required, both of which were long. However, if the pH adjustment as described above is performed in the addition section where the additive amount is 0.2%, the concentrations of cis-1,2-DCE and VC are below the environmental standard value in 60 days. .

  In addition, FIG. 5 is a graph which shows the pH change by the difference in the addition amount of an additive. As shown in FIG. 5, in Table 1, when the period until the reference value or less is short (60 days or 90 days), that is, when the additive amount is other than 0.2% and 0.4% In any case, when 30 days passed, pH showed a value of 6.3 or more. From the above, in order to improve the VOC purification rate, it is preferable to adjust the pH to be 6.3 or higher.

=== Comparison with conventional examples ===
Finally, a comparison between the additive of the present example (containing sodium gluconate) and the additive of the conventional example (containing lactose: trade name “EDC”) is shown.

  FIG. 6 is a graph showing the change over time of the VOC concentration in the present example and the conventional example. (A) shows the change over time of the PCE concentration, and (b) shows the change over time of the TCE concentration. In the same figure, the control group is the one with no additive added, and the additive containing the nitrogen source and phosphorus source is added, and the additive not containing the nitrogen source and phosphorus source is added. This is the test area.

  As shown in FIG. 6, in the case of the control group to which no additive was added, the concentrations of PCE and TCE did not change so much and did not fall below the environmental standard value. Further, when the conventional additive (lactose content: trade name “EDC”) is added, the concentrations of PCE and TCE are about 0.1 mg / kg after 7 days from the addition of the additive. 1 and high concentration values of about 10 mg / l, both of which do not satisfy the environmental standard value.

  On the other hand, when the additive of this example (containing sodium gluconate) was added, after about 3 days had passed since the additive was added, PCE was below the environmental standard value (≦ 0.01 mg / l) (see FIG. 6A). Similarly, TCE was below the environmental standard value (≦ 0.03 mg / l) (see FIG. 6B).

  As described above, when the additive of this example (containing sodium gluconate) is used, the VOC purification rate is higher than when the additive of conventional example (containing lactose: trade name “EDC”) is used. Further improve.

  Further, the additive of the present example is extremely inexpensive, whereas the additive of the conventional example (containing lactose: trade name “EDC”) is expensive. Therefore, when the additive of the present example is used, the purification cost is further reduced as compared with the case of using the additive of the conventional example.

It is a graph which shows the laboratory test result in one Example of this invention, (a) is a graph which shows the VOC decomposition | disassembly rate at the time of adding sodium gluconate alone, (b) is a nitrogen source and a gluconate soda. It is a graph which shows the VOC decomposition | disassembly rate at the time of adding what mix | blended the phosphorus source. It is a graph which shows the relationship between the addition amount of an additive and a time-dependent change of a VOC density | concentration, (a) shows the VOC change of a control group, (b) is an addition density | concentration 0.025%, (c) is an addition density | concentration. 0.05%, (d) is 0.1% added concentration, (e) is 0.2% added concentration, (f) is 0.4% added concentration, (g) is VOC change of 1% added concentration. Show. It is a graph which shows a time-dependent change of the VOC density | concentration at the time of adding a pH adjuster initially, (a) shows the VOC change of a control group, (b) shows the VOC change of a pH adjuster addition group (pH: 7). (C) shows the VOC change in the pH adjuster addition group (pH: 8). It is a graph which shows the pH change of each test section in one Example of this invention. It is a graph which shows the pH change by the difference in the addition amount of the additive in one Example of this invention. It is a graph which shows a time-dependent change of the VOC density | concentration in a present Example and a prior art example, (a) shows a time-dependent change of PCE density | concentration, (b) shows a time-dependent change of TCE density | concentration.

Claims (7)

It has been contaminated soil and contaminated water contaminated by organic halogen compounds, have a degrading activity of the organic halogen compound, in the purification method of the contaminated soil and contaminated water purifying by anaerobic microorganisms present in the contaminated soil and the contaminated water There,
An additive containing at least one or more gluconic acid derivatives such as gluconic acid and gluconate, gluconic acid amide, gluconic acid ester, and gluconic acid anhydride is added to the contaminated soil and / or the contaminated water. Purification method for contaminated soil and water. It has been contaminated soil and contaminated water contaminated by organic halogen compounds, have a degrading activity of the organic halogen compound, in the purification method of the contaminated soil and contaminated water purifying by anaerobic microorganisms present in the contaminated soil and the contaminated water There,
An additive containing at least one of gluconic acid derivatives such as gluconic acid and gluconate, gluconic acid amide, gluconic acid ester, and gluconic acid anhydride in the contaminated soil and / or the contaminated water as a hydrogen donor. In addition, a method for purifying contaminated soil and contaminated water, wherein the anaerobic microorganism is activated by an organic acid generated in an anaerobic environment . It has been contaminated soil and contaminated water contaminated by organic halogen compounds, have a degrading activity of the organic halogen compound, in the purification method of the contaminated soil and contaminated water purifying by anaerobic microorganisms present in the contaminated soil and the contaminated water There,
An additive containing at least one of gluconic acid derivatives such as gluconic acid and gluconate, gluconic acid amide, gluconic acid ester, and gluconic acid anhydride in the contaminated soil and / or the contaminated water as a hydrogen donor. In addition, a method for purifying contaminated soil and contaminated water, wherein the anaerobic microorganism is activated by an organic acid generated in an anaerobic environment without aeration . In the purification method of the contaminated soil and contaminated water according to any one of claims 1 to 3 ,
The additive is
A method for purifying contaminated soil and contaminated water, comprising at least one or more of sodium gluconate, potassium gluconate, and calcium gluconate as a main component, and a nitrogen source and a phosphorus source. In the purification method of the contaminated soil and contaminated water according to claim 4 ,
The weight ratio (%) of C: N: P contained in the additive is:
The method for purifying contaminated soil / polluted water, wherein the ratio is 34: 3: 0.3. In the purification method of the contaminated soil and contaminated water according to claims 1 to any one of 5,
A method for purifying contaminated soil and contaminated water, comprising adding a pH adjuster to at least one of the contaminated soil, the contaminated water, and the additive. Additives used in purifying method contaminated soil and contaminated water according to any one of claims 1 to 6.

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