JPH01197591A - Soil conditioning - Google Patents
Soil conditioningInfo
- Publication number
- JPH01197591A JPH01197591A JP2222688A JP2222688A JPH01197591A JP H01197591 A JPH01197591 A JP H01197591A JP 2222688 A JP2222688 A JP 2222688A JP 2222688 A JP2222688 A JP 2222688A JP H01197591 A JPH01197591 A JP H01197591A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- chelating agent
- plants
- acidic
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002689 soil Substances 0.000 title claims abstract description 49
- 230000003750 conditioning effect Effects 0.000 title 1
- 239000002738 chelating agent Substances 0.000 claims abstract description 19
- 230000002378 acidificating effect Effects 0.000 claims abstract description 17
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 15
- 239000004480 active ingredient Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 239000013043 chemical agent Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052742 iron Inorganic materials 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 abstract description 2
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 abstract 1
- 241000196324 Embryophyta Species 0.000 description 13
- 229910052683 pyrite Inorganic materials 0.000 description 8
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 8
- 239000011028 pyrite Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- -1 iron ions Chemical class 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000008635 plant growth Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- SHWNNYZBHZIQQV-UHFFFAOYSA-J EDTA monocalcium diisodium salt Chemical compound [Na+].[Na+].[Ca+2].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O SHWNNYZBHZIQQV-UHFFFAOYSA-J 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241000209504 Poaceae Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- NFMAZVUSKIJEIH-UHFFFAOYSA-N bis(sulfanylidene)iron Chemical compound S=[Fe]=S NFMAZVUSKIJEIH-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 231100000676 disease causative agent Toxicity 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- OQKCUQQTEDLJJP-UHFFFAOYSA-N methyl N-[(2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)carbonyl]-beta-alaninate Chemical compound COC(=O)CCNC(=O)C1=CC(=O)NC(=O)N1 OQKCUQQTEDLJJP-UHFFFAOYSA-N 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003463 sulfur Chemical class 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は酸′左硫酸塩土壌における土壌改良工法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a soil improvement method for acidic sulfate soil.
（従来の技術およびその問題点）
従来、海岸の干拓地盤とか洪積世のｆＩ隆地１台地の中
に含まれる古い地震時代の連成粘土層を掘削しで、道路
建設とか、農地、宅地造成等各種の開発工事を実施して
いるが、これ等の土壌には楊めて酸性の強い地層が現わ
れることかある。この土壌はいわゆる酸性硫酸塩土壌い
われ、通常の酸性土壌がｐＨ４程度のところｐＨ３以下
、極端にはｐＨＩオターを示すこともある位楊めて強い
酸性を示す土壌である。(Conventional technology and its problems) Traditionally, the interlocking clay layer from the old earthquake era, which is included in the reclaimed land of the coast or the fI upland plateau of the diluvial era, is excavated for road construction, farmland, residential land development, etc. A variety of development works are being carried out, but in some cases highly acidic strata may appear in the soil. This soil is so-called acidic sulfate soil, and is extremely acidic, with a pH of 3 or lower, where normal acidic soils have a pH of about 4, and in extreme cases can even show a pH of 0.
このような土壌地帯において金属類のパイプ等の埋設施
設とか、樹木の植栽、草種の播種等の緑化工事を施工す
ると金属類は早期に腐植し施設の耐用年数が極端に低下
したつ、緑化工事により導入した樹木、草種等の植物が
枯死したつ、活着不良となる等積々の問題か生じでいた
。If you bury metal pipes or perform greening work such as planting trees or sowing grass in such soil areas, the metals will quickly rot and the service life of the facility will be drastically reduced. Trees, grasses, and other plants introduced during greening work were causing a number of problems, such as withering and failure to take root.
この極めで強い酸性の原因は、地中深く嫌気状態で存在
していた土層か開発行為によって露頭を現わし、急激な
酸化を始めることにあり、即ち、連成粘土層等に多量に
含まれる鉄（Ｆｅ）と硫黄（Ｓ）かパイライト（黄鉄鉱
・Ｆｅ５２）を生成しており、これの酸性生成物として
硫酸ができる結果、土壌のｐＨを上記のように極めて強
い酸性とすることにある。The cause of this extremely strong acidity is that the soil layer that existed deep underground in an anaerobic state comes out into the open through development activities and begins to oxidize rapidly. Iron (Fe) and sulfur (S) or pyrite (pyrite/Fe52) are produced, and sulfuric acid is produced as an acidic product of this, which makes the pH of the soil extremely acidic as shown above. .
このような強酸性土壌の改良方法の従来の方法は、土壌
中に生成される硫酸の量に見合った石灰を土壌に混入す
るとか、過酸化水素により強制酸化する方法か一部実施
されているが極めて大量の石灰の投入か必要であったり
、また強制酸化したのち石灰で中程する必要があり、工
程か２種に亘る等実際の改良工法として実施が困難なも
のか多い。Conventional methods for improving highly acidic soil include mixing lime into the soil in an amount commensurate with the amount of sulfuric acid produced in the soil, or forcing oxidation with hydrogen peroxide. However, it is often difficult to implement as an actual improvement method, as it requires the input of an extremely large amount of lime, and it requires forced oxidation followed by intermediate treatment with lime, which involves two different processes.
本発明者等は従来の上記酸性硫酸塩土壌の改良方法につ
いて、その原因物質であるパイライト（ＦｅＳ２）の除
去方法について研究を重ね、金１類と極めて安定な水溶
′ｉ錯塩をつくるキレート剤に着目し試験を重ねた結果
、極めて有効にパイライトの鉄とキレート剤が水溶性錯
塩を形成し、硫黄（硫酸イオン）はキレート剤の一部と
結合し、流失または不活性の物質となるとの知見を得て
本発明に到達した。The present inventors have conducted extensive research on methods for removing pyrite (FeS2), which is the causative agent of the above-mentioned conventional methods for improving acidic sulfate soil, and developed a chelating agent that forms extremely stable water-soluble complex salts with Class 1 gold. As a result of repeated tests, we found that the iron in pyrite and the chelating agent form a water-soluble complex salt very effectively, and the sulfur (sulfate ion) binds with a portion of the chelating agent, causing it to be washed away or become an inert substance. As a result, the present invention was achieved.
（問題点を解決する為の手段）
即ち本発明は、酸性硫酸塩土壌においてキレート剤を有
効成分とする薬剤を該土壌に接触せしめることを特徴と
する土壌改良工法である。(Means for Solving the Problems) That is, the present invention is a soil improvement method characterized by bringing a chemical agent containing a chelating agent as an active ingredient into contact with acidic sulfate soil.
本発明を更に詳細に実施例をあげながら説明する。The present invention will be explained in more detail by giving examples.
本発明に使用できるキレート剤はＥＤＴＡ、Ｎ１八等各
種のものか使用できるか、特にＥＤＴＡのナトリウムタ
イプ、カルシウムタイプといわれるものか有効である。The chelating agents that can be used in the present invention include various chelating agents such as EDTA and N18, and sodium and calcium EDTA types are particularly effective.
これ等のキレート剤を使用して具体的に土壌改良を実施
する方法としでは次のような方法である。Specific methods for soil improvement using these chelating agents are as follows.
（実施例１）
地震調査の結果、あるいは現地土層の生成状況の調査に
より酸性硫酸塩土壌の予想される土層に鉄バイブ等の金
」バイブを埋設する場合、予め掘削しで形成された溝あ
るいは穿孔の壁面の土壌を調査してパイライトの含有Ｎ
を測定する。このパイライトの鉄イオン量をキレート化
するに相当するキレート剤を掘削溝壁あるいは鉄バイブ
等埋設した上に埋戻す土壌に散布等の手段を用いて接触
せしめる。このようにするとキレート−Ｍｌは金属イオ
ンと１＝１のモル比で水溶性の詔塩を形成し、硫酸イオ
ン等の陰イオンを遊刈させる。この遊離硫酸イオン等は
キレート剤が鉄等の金属イオンを配位結合する時放出す
る陽イオン（Ｎａ” 、 Ｃａ＋２等）により中和及び
除去される。従って埋設された鉄バイブ等は酸性硫酸塩
土壌等によっても腐食することなく永続的にその機能を
維持することかできる。(Example 1) When burying a gold vibrator such as an iron vibrator in a soil layer that is predicted to be acidic sulfate soil based on the results of an earthquake survey or a survey of the formation status of the local soil layer, Examine the soil on the walls of trenches or boreholes to determine the N content of pyrite.
Measure. A chelating agent equivalent to chelating the amount of iron ions in this pyrite is brought into contact with the soil of the excavated trench wall or the buried iron vibrator, etc., by means of spraying or the like. In this way, chelate-Ml forms a water-soluble sulfur salt with a metal ion in a molar ratio of 1=1, and frees anions such as sulfate ions. These free sulfate ions are neutralized and removed by cations (Na'', Ca+2, etc.) released when the chelating agent coordinates metal ions such as iron. Therefore, buried iron vibs, etc. It can maintain its function permanently without being corroded by soil etc.
（実施例２）
他の実施例としては前記実施例１と同様に酸性硫酸塩土
壌か予想される土壌においで植物を導入して緑地等を形
成する場合、平坦地とか緩傾斜の軟質土壌であれば植物
の生育基盤となる土壌を耕起したのち、現地土壌のパイ
ライト含量を調査測定し、この鉄イオンに相当するキレ
ート剤を散布等の手段を用いて接触せしめる。例えば、
植物（草本）の生育に必要な土壌層を表層２０ｃｍとす
ると、改良を必要とする土壌量２００ ｋｑ／ｍ２（見
掛は比重１として）この場所の含有鉄量が６０００ Ｐ
ＰＭとすると、１２００に９／ｍ２．これをキレートす
るに要するキレート剤は３ 、 １ ｋｇ／ｍ２どなる
。（通常はこの理論値の前後２．０〜４ 、０ ｋｑ／
ｍ２を散布する）これを現地土壌に散布し土壌改良を実
施するのである。(Example 2) As another example, similar to Example 1, when plants are introduced into soil that is expected to be acidic sulfate soil to form a green space, etc. After plowing the soil, which serves as a base for plant growth, if any, the pyrite content of the local soil is investigated and measured, and a chelating agent corresponding to this iron ion is brought into contact with the soil by means such as spraying. for example,
Assuming that the soil layer necessary for the growth of plants (herbaceous plants) is the surface layer of 20 cm, the amount of soil that requires improvement is 200 kq/m2 (apparent specific gravity is 1), and the iron content in this location is 6000 P.
PM is 9/m2 to 1200. The amount of chelating agent required to chelate this is 3.1 kg/m2. (Usually around this theoretical value 2.0 to 4,0 kq/
m2) is sprayed on the local soil to improve the soil.
また植物を導入しようとする基盤が急傾斜しでおり、な
おかつ硬震工壌である場合、法面に寒。Also, if the foundation you are trying to introduce plants into is steeply sloped and has hard-earth soil, the slope will be cold.
溝、突起物ネット等の壬レート剤の土壌への浸透促進処
理を施したのち、上記と同様にキレート剤を散布し、土
壌と接触せしめる。After performing a treatment to promote the penetration of the chelating agent into the soil using grooves, projection nets, etc., the chelating agent is sprayed in the same manner as above and brought into contact with the soil.
以上のように酸゛１硫ｖｉ塩土壌にキレート剤を散布処
理したの５、現地で２０〜３０ｍｍの降雨そまつか、又
はこれに相当する水を散布したのち、植物を播種（種子
吹付工、ｆ！子付のネット状緑化基体の施工）、または
植栽により導入する。As mentioned above, after spraying the chelating agent on the acid monosulfate soil5, we sprayed water after 20 to 30 mm of rainfall at the site or the equivalent amount, and then sowed plants (seed sprayer, etc.). f!Construction of a net-shaped greening substrate with children) or by planting.
現地での実際の試験結果では現地にあける施工前のｐＨ
は２．４であったか、キレート斉りを４．０４７ｍ２散
布すると以下の表の通りとなった。Actual test results at the site show that the pH level before construction at the site
was 2.4, and when 4.047 m2 of chelate was sprayed, the results were as shown in the table below.
×普通の植物の生育するｐＨは５．０〜７．５といわれ
ている。×The pH at which normal plants grow is said to be 5.0 to 7.5.
以上のようにすると導入した植物は健全に生育し、従来
長Ｍ開放＝（数年間）したのちでしか植物の導入かでき
なかった酸゛ｉ硫酸塩土壌においてｂ′ｆＮ天に裸地化
後短期間で植物を導入することかできるようになった。By doing the above, the introduced plants will grow healthily, and in the acidic sulfate soil, where conventionally plants could only be introduced after opening the soil for several years, after the soil was denuded to the b'fN sky. It became possible to introduce plants in a short period of time.
特に上記の土１！１改良処理したのち、植物の導入に際
しての播種工において石灰質材料等の遊離した硫酸イオ
ンを中和する材料とか、植物の発芽生育基盤を形成する
材料等を用いて厚層（２〜３ｃｌＴ１程度）の植土基盤
を形成する方法（有機客土吹付工法）を実施すればより
確実に植物を導入することかできる。In particular, after the above-mentioned soil 1! Plants can be introduced more reliably by implementing a method (organic soil spraying method) of forming a planting soil base of about 2 to 3 clT1.
（発明の効果）
本発明は以上のように酸性硫酸塩土壌においてキレート
剤を散布等の手段を用いてパイライトと接触せしめ、パ
イライトの鉄イオンをキレート剤と結合ざぜで水溶性の
錯塩として除去すると同時に、主レート剤と鉄等の金属
イオンを配位する際に放出する陽イオンが一硫酸イオン
と結合して中和除去されるという土壌改良工法であるか
ら、従来のように長期間放置したり、強制的に酸化させ
てハイライトを早期に硫酸化させて石灰等で中和させる
等２工程（こ亘るなとの効率の悪い方法しかなく、鉄バ
イブ等の金属埋設物の腐植防止あるいは裸地面の植物導
入方法等に困難であった点を大幅（こ改善した画期的な
工法である。従って本発明の実施により地下埋設の鉄バ
イブ等の腐植を防止し、その機能を永続的にすることが
でき、また植物の導入に当って、本発明の土壌改良工法
を実施すれば、導入した植物の種苗は枯死することなく
健全な発芽、生育をすることかできる。(Effects of the Invention) As described above, the present invention enables a chelating agent to be brought into contact with pyrite in acidic sulfate soil using means such as spraying, and iron ions in pyrite are removed as water-soluble complex salts by combining with the chelating agent. At the same time, since this is a soil improvement method in which the cations released when coordinating the main rate agent with metal ions such as iron combine with monosulfate ions and are neutralized and removed, they cannot be left for a long period of time like in the past. There are only two inefficient methods, such as forcing oxidation to sulfate highlights early and neutralizing them with lime, etc. This is an epoch-making method that has greatly improved the difficulty of introducing plants into bare ground.Therefore, by implementing the present invention, it is possible to prevent humus on underground iron vibrators, etc., and permanently maintain their functions. Furthermore, if the soil improvement method of the present invention is carried out when introducing plants, the seeds and seedlings of the introduced plants can germinate and grow in a healthy manner without dying.
Claims (1)
る土壌改良工法。[Scope of Claim] A soil improvement method characterized by bringing a chemical agent containing a chelating agent as an active ingredient into contact with acidic sulfate soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63022226A JPH0684498B2 (en) | 1988-02-01 | 1988-02-01 | Revegetation method on acid sulfate soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63022226A JPH0684498B2 (en) | 1988-02-01 | 1988-02-01 | Revegetation method on acid sulfate soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01197591A true JPH01197591A (en) | 1989-08-09 |
| JPH0684498B2 JPH0684498B2 (en) | 1994-10-26 |
Family
ID=12076887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63022226A Expired - Fee Related JPH0684498B2 (en) | 1988-02-01 | 1988-02-01 | Revegetation method on acid sulfate soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0684498B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113439497A (en) * | 2021-06-17 | 2021-09-28 | 广西壮族自治区自然资源生态修复中心 | Method for stripping and recycling soil on hooked plough layer of land for hilly and mountain construction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4859087A (en) * | 1971-11-27 | 1973-08-18 | ||
| JPS4890847A (en) * | 1972-03-02 | 1973-11-27 | ||
| JPS5169057A (en) * | 1974-12-03 | 1976-06-15 | Teikoku Hormone Mfg Co Ltd | Jukinzokuosendojono kaizenhoho |
| JPS52107964A (en) * | 1976-02-27 | 1977-09-10 | Sumitomo Cement Co | Process for treating polluted soil with heavy metals |
-
1988
- 1988-02-01 JP JP63022226A patent/JPH0684498B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4859087A (en) * | 1971-11-27 | 1973-08-18 | ||
| JPS4890847A (en) * | 1972-03-02 | 1973-11-27 | ||
| JPS5169057A (en) * | 1974-12-03 | 1976-06-15 | Teikoku Hormone Mfg Co Ltd | Jukinzokuosendojono kaizenhoho |
| JPS52107964A (en) * | 1976-02-27 | 1977-09-10 | Sumitomo Cement Co | Process for treating polluted soil with heavy metals |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113439497A (en) * | 2021-06-17 | 2021-09-28 | 广西壮族自治区自然资源生态修复中心 | Method for stripping and recycling soil on hooked plough layer of land for hilly and mountain construction |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0684498B2 (en) | 1994-10-26 |
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| LAPS | Cancellation because of no payment of annual fees |