JP2002201472A - METHOD FOR ADJUSTING pH OF SOIL - Google Patents
METHOD FOR ADJUSTING pH OF SOILInfo
- Publication number
- JP2002201472A JP2002201472A JP2000401935A JP2000401935A JP2002201472A JP 2002201472 A JP2002201472 A JP 2002201472A JP 2000401935 A JP2000401935 A JP 2000401935A JP 2000401935 A JP2000401935 A JP 2000401935A JP 2002201472 A JP2002201472 A JP 2002201472A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- gas
- adjusting
- water content
- quicklime
- 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.)
- Abandoned
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、土壌に生石灰を混
合することによって土壌の含水比を低下させる処理など
を行うことによりｐＨが上昇した土壌に対して、そのｐ
Ｈを目的値に低下させるための土壌のｐＨの調整方法に
関する。BACKGROUND OF THE INVENTION The present invention relates to a method for reducing the water content of a soil by mixing quicklime with the soil, for example, for treating a soil whose pH has been increased.
The present invention relates to a method for adjusting soil pH to lower H to a target value.
【０００２】[0002]
【従来の技術】建設、土木分野においては、水分を多く
含む土壌、いわゆる含水比が高い土壌を地盤とする現場
に建物を建設したりする際に、地盤を安定化させるため
に土壌に生石灰を混合することにより土壌の含水比を低
下させる処理を行う。この含水比低下処理は地盤をより
強固にさせることから、耐震設計にかかせないものとし
て、近年では一般的にも認知され、工事の規模に関わら
ずほとんどの現場で必須作業として採用されるケースが
増えている。2. Description of the Related Art In the field of construction and civil engineering, when a building is constructed on a site having a soil containing a large amount of water, that is, a soil having a high water content, ground lime is used to stabilize the ground. The mixture is mixed to reduce the water content of the soil. This water content reduction treatment is generally accepted in recent years as being indispensable for seismic design because it strengthens the ground, and is adopted as an essential work at most sites regardless of the scale of construction Is increasing.
【０００３】高含水比の土壌に生石灰を混合する処理
は、効果的に土壌の水分を取り除き、それによって土壌
の粘性度を低下させて、取り扱いを容易にさせることか
ら、近年、汚染土壌の浄化処理においても取り入れられ
るようになってきた。土壌汚染では、揮発性の有機溶剤
（例えば、トリクロロエチレン）のような汚染物質は土
壌中に侵入したあと、長い時間をかけて土壌間隙中を移
動し、物質が移動し難い比較的粘性度が高い土壌部に留
まる傾向がある。このため、汚染土壌の浄化処理におい
て、含水比の高い汚染された土壌に生石灰を混合するこ
とにより汚染土壌中の有機溶剤を揮発させ、汚染物質を
除去する方法が採用されるケースが増えてきた。[0003] The treatment of mixing quicklime with soil having a high water content effectively removes moisture from the soil, thereby reducing the viscosity of the soil and facilitating the handling thereof. It has also been incorporated in processing. In soil contamination, contaminants such as volatile organic solvents (eg, trichloroethylene) enter the soil and then travel through the interstitial space over a long period of time, making the material difficult to move and relatively viscous. It tends to stay in the soil. For this reason, in the purification treatment of the contaminated soil, a method of removing the pollutants by mixing the quicklime with the contaminated soil having a high water content to volatilize the organic solvent in the contaminated soil has been increased. .
【０００４】しかしながら、土壌に生石灰を混合する
と、土壌のｐＨが上昇するという問題点が生じる。汚染
土壌の浄化処理においては、浄化処理した後の土壌を埋
め戻すことが要求されるケースが増えてきている。こう
した場合、ｐＨが上昇したままの土壌を地中に埋め戻す
ことによって、地下水のｐＨを上昇させるというよう
な、地中の環境への影響が懸念される。またｐＨを下げ
る処理としては、酸性の薬品の添加等が考えられるが、
こうした処理は環境中に存在しない物質を人為的に添加
することによって必要ない物質を土壌中に残してしまう
可能性があったり、さらには薬品を添加することによっ
て生石灰混合によって低下させた土壌の含水比を再度上
昇させていまい土壌の取り扱い性を難しくさせてしま
う。[0004] However, mixing quicklime with soil raises a problem that the pH of soil rises. In the purification treatment of contaminated soil, it has been increasingly required to refill the soil after the purification treatment. In such a case, there is a concern about the influence on the underground environment, such as raising the pH of groundwater by backfilling the soil with the increased pH in the ground. As the treatment for lowering the pH, addition of an acidic chemical is considered,
Such treatments can leave unwanted substances in the soil by artificially adding substances that are not present in the environment, or even reduce the water content of the soil reduced by the addition of quicklime to the addition of chemicals. Raising the ratio again makes handling of soil difficult.
【０００５】このため、生石灰を混合した土壌の取り扱
い性を保ちながらｐＨを環境に影響を与えない中性領域
に下げる技術が必要とされる。[0005] Therefore, there is a need for a technique for lowering the pH to a neutral region that does not affect the environment while maintaining the handleability of soil mixed with quicklime.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記問題点
を解決するために、生石灰混合等によって水酸化カルシ
ウムを含有するｐＨが上昇した土壌に対して、含水比を
上昇させることなく、かつ短時間のうちにｐＨを目的値
まで低下させることが可能な土壌のｐＨの調整方法を提
供することを目的とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made without increasing the water content ratio of soil containing calcium hydroxide having an increased pH due to mixing of quicklime and the like. An object of the present invention is to provide a method for adjusting the pH of soil, which can lower the pH to a target value in a short time.
【０００７】[0007]
【課題を解決するための手段】本発明に係る土壌のｐＨ
の調整方法は、水酸化カルシウム（Ｃａ（ＯＨ）2）を
含有する土壌に、二酸化炭素（ＣＯ2）ガスを含むｐＨ
調整ガスを接触させることにより前記土壌中のＣａ（Ｏ
Ｈ）2と前記ｐＨ調整ガス中のＣＯ2を反応させ、前記土
壌のｐＨを低下させることを特徴とするものである。The pH of the soil according to the present invention
The method for adjusting the pH of soil containing calcium hydroxide (Ca (OH) 2 ) is a method of adjusting the pH containing carbon dioxide (CO 2 ) gas.
By contacting the conditioning gas, Ca (O
H) 2 is reacted with CO 2 in the pH adjusting gas to lower the pH of the soil.
【０００８】[0008]
【発明の実施の形態】本発明に係る土壌のｐＨの調整方
法は、水酸化カルシウム（Ｃａ（ＯＨ）2）を含有する
土壌に、二酸化炭素ガスを含むｐＨ調整ガスを接触させ
ることにより前記土壌中のＣａ（ＯＨ）2と前記ｐＨ調
整ガス中のＣＯ2を反応させ、前記土壌のｐＨを低下さ
せることを特徴とする。BEST MODE FOR CARRYING OUT THE INVENTION The method for adjusting the pH of soil according to the present invention comprises: contacting a soil containing calcium hydroxide (Ca (OH) 2 ) with a pH adjusting gas containing carbon dioxide gas. Ca (OH) 2 therein is reacted with CO 2 in the pH-adjusting gas to lower the pH of the soil.
【０００９】水酸化カルシウム（Ｃａ（ＯＨ）2）を含
有する土壌は、例えば、水分を含有する土壌に生石灰
（ＣａＯ）を混合することにより得られる。水分を含有
する土壌に生石灰（ＣａＯ）を混合すると、下記（１）
の反応式に示すように生石灰と水が反応してＣａ（Ｏ
Ｈ）2が生成する。この生成反応で水が消費されると共
に、この生成反応は発熱反応であるために土壌の温度が
上昇（例えば、１００℃程度）して土壌中の水分の蒸発
が促される。その結果、土壌の含水比を低下させること
ができ、かつ生成したＣａ（ＯＨ）2により土壌のｐＨ
が上昇する。また、水分を含有する土壌中に揮発性の有
機溶剤（例えば、トリクロロエチレン）のような汚染物
質が含まれている場合、このような土壌に対して生石灰
を混合すると、水分の蒸発と併せて有機溶剤の揮発が生
じるため、含水比の低下処理と共に汚染物質の浄化を行
うことが可能である。A soil containing calcium hydroxide (Ca (OH) 2 ) can be obtained, for example, by mixing quicklime (CaO) with a soil containing water. When quicklime (CaO) is mixed with soil containing water, the following (1)
As shown in the reaction equation, quicklime and water react to form Ca (O
H) 2 is produced. Water is consumed in this production reaction, and since this production reaction is an exothermic reaction, the temperature of the soil rises (for example, about 100 ° C.), and the evaporation of water in the soil is promoted. As a result, the water content of the soil can be reduced, and the pH of the soil can be reduced by the generated Ca (OH) 2.
Rises. When contaminants such as volatile organic solvents (for example, trichloroethylene) are contained in soil containing water, if quicklime is mixed into such soil, organic matter will be generated together with evaporation of water. Since the solvent is volatilized, it is possible to purify contaminants together with the treatment for lowering the water content.
【００１０】 ＣａＯ＋Ｈ2Ｏ → Ｃａ（ＯＨ）2＋１５．６Ｋｃａｌ （１） 生石灰の添加量は、水分を含有する土壌１００重量部に
対して５〜２０重量部の範囲内にすることが好ましい。
より好ましい範囲は、水分を含有する土壌１００重量部
に対して７〜１０重量部である。CaO + H 2 O → Ca (OH) 2 +15.6 Kcal (1) The amount of quicklime added is preferably in the range of 5 to 20 parts by weight based on 100 parts by weight of soil containing water.
A more preferred range is 7 to 10 parts by weight based on 100 parts by weight of water-containing soil.
【００１１】Ｃａ（ＯＨ）2を含有する土壌に、大気中
のＣＯ2存在比率を超える濃度で二酸化炭素ガスを含む
ｐＨ調整ガスを接触させると、下記（２）の反応式に示
すように土壌中のＣａ（ＯＨ）2とｐＨ調整ガス中のＣ
Ｏ2が反応する。この反応により土壌中のＯＨイオンが
固定されるため、土壌のｐＨを低下させることができ
る。なお、（２）の反応により水が生成するが、この水
は土壌中に残っているＣａＯと反応し、蒸発するため、
生成水により土壌の含水比が上昇することはほとんどな
い。When a pH-adjusting gas containing carbon dioxide gas is brought into contact with a soil containing Ca (OH) 2 at a concentration exceeding the CO 2 abundance ratio in the atmosphere, the soil becomes as shown in the following reaction formula (2). Ca (OH) 2 in pH and C in pH adjusting gas
O 2 reacts. The OH ions in the soil are fixed by this reaction, so that the pH of the soil can be lowered. In addition, water is generated by the reaction of (2), and this water reacts with CaO remaining in the soil and evaporates.
The generated water hardly increases the water content of the soil.
【００１２】 Ｃａ（ＯＨ）2＋ＣＯ2 → ＣａＣＯ3＋Ｈ2Ｏ （２） ｐＨ調整ガス中の二酸化炭素ガスの濃度は、大気中のＣ
Ｏ2存在比率よりも高くすることが望ましい。ｐＨ調整
ガス中のＣＯ2濃度は、処理効率の観点から、１００％
に近い程よい。これは、ｐＨ調整ガス中のＣＯ2濃度と
反応時間は反比例の関係にあり、ＣＯ2濃度が高いほど
反応時間が速いからである。Ca (OH) 2 + CO 2 → CaCO 3 + H 2 O (2) The concentration of carbon dioxide gas in the pH adjusting gas is C
It is desirable to make it higher than the O 2 abundance ratio. The CO 2 concentration in the pH adjusting gas is 100% from the viewpoint of processing efficiency.
The closer to, the better. This is because the CO 2 concentration in the pH adjusting gas and the reaction time have an inverse relationship, and the higher the CO 2 concentration, the faster the reaction time.
【００１３】ｐＨ調整ガスは、二酸化炭素ガスと併せ
て、窒素ガス、一酸化炭素ガス、酸素ガス、不活性ガス
（例えば、アルゴンガス、ヘリウムガス等）、酸化窒素
ガス（例えば、ＮＯ、ＮＯ2等が挙げられる）、酸化硫
黄ガス（例えば、ＳＯ2、ＳＯ3等が挙げられる）等の他
の種類のガスを含有することができる。ｐＨ調整ガス中
の他のガスの種類は、１種類または２種類以上にするこ
とができる。特に、大気中のＣＯ2存在比率よりも高い
濃度で二酸化炭素ガスを含有する排ガスをｐＨ調整ガス
として使用すると、排ガス中の二酸化炭素を有効活用す
ることができ、省資源及び省エネルギー化につながる。
使用する排ガスの種類は特に限定されないが、二酸化炭
素と併せて窒素酸化物ガスを含有するような自動車排ガ
スや、工業排ガスを利用することができる。窒素酸化物
ガスがｐＨ低下を早めるために処理速度の面から有利で
ある。なお、排ガスには、有機物を燃焼させて得るガス
を使用することができる。The pH adjusting gas may be a nitrogen gas, a carbon monoxide gas, an oxygen gas, an inert gas (eg, an argon gas, a helium gas, etc.), a nitrogen oxide gas (eg, NO, NO 2 ) in addition to the carbon dioxide gas. And other types of gases such as sulfur oxide gas (for example, SO 2 , SO 3 and the like). The types of other gases in the pH adjusting gas can be one or more. In particular, when an exhaust gas containing carbon dioxide gas at a concentration higher than the CO 2 abundance ratio in the atmosphere is used as a pH adjusting gas, carbon dioxide in the exhaust gas can be effectively used, which leads to resource saving and energy saving.
The type of the exhaust gas to be used is not particularly limited, but an automobile exhaust gas or an industrial exhaust gas containing a nitrogen oxide gas in addition to carbon dioxide can be used. Nitrogen oxide gas is advantageous from the viewpoint of the processing speed because it accelerates the pH drop. Note that a gas obtained by burning an organic substance can be used as the exhaust gas.
【００１４】Ｃａ（ＯＨ）2を含有する土壌にｐＨ調整
ガスを間欠的に接触させるよりも連続的に接触させる方
が、処理時間を短縮することができるため、好ましい。
連続接触方法としては、例えば、Ｃａ（ＯＨ）2を含有
する土壌を反応管に充填し、この反応管にｐＨ調整ガス
を流通させる方法を採用することができる。このような
方法によると、土壌とｐＨ調整ガスとの接触頻度を高く
することができるため、短時間のうちに土壌のｐＨを目
的値に低下させることができる。It is preferable to continuously contact the pH-adjusting gas with the soil containing Ca (OH) 2 rather than intermittently, because the treatment time can be shortened.
As the continuous contact method, for example, a method in which soil containing Ca (OH) 2 is filled in a reaction tube and a pH adjusting gas is passed through the reaction tube can be adopted. According to such a method, since the frequency of contact between the soil and the pH adjusting gas can be increased, the pH of the soil can be reduced to the target value in a short time.
【００１５】以上説明した本発明に係る土壌のｐＨ調整
方法によれば、水酸化カルシウム（Ｃａ（ＯＨ）2）を
含有する土壌に、大気中のＣＯ2存在比率を越える濃度
で二酸化炭素（ＣＯ2）ガスを含むｐＨ調整ガスを接触
させることによって、土壌中のＣａ（ＯＨ）2とｐＨ調
整ガス中のＣＯ2を反応させると共に、この反応で生成
される水は土壌中に残るＣａＯとの反応による熱によっ
て蒸発する為、土壌の含水比を上昇させずに短時間のう
ちに土壌のｐＨを目的領域（例えば、中性領域）まで低
下させることができる。According to the above-described method for adjusting the pH of soil according to the present invention, the soil containing calcium hydroxide (Ca (OH) 2 ) is treated with carbon dioxide (CO) at a concentration exceeding the CO 2 abundance ratio in the atmosphere. by contacting the pH adjusted gas containing 2) gas, the reaction of CO 2 in the Ca (OH) 2 and pH adjustment in the gas in the soil, water produced in this reaction with CaO remaining in the soil Since the water is evaporated by the heat of the reaction, the pH of the soil can be reduced to a target region (for example, a neutral region) in a short time without increasing the water content of the soil.
【００１６】特に、水分を含有する土壌に生石灰を混合
することによって土壌の含水比を低下させた後、この生
石灰の混合でアルカリ性側に傾いた土壌にｐＨ調整ガス
を接触させると、土壌中のＣａ（ＯＨ）2とｐＨ調整ガ
ス中のＣＯ2が反応してＣａ（ＯＨ）2がより安定なＣａ
ＣＯ3に変換されると共に、ＣａＣＯ3生成反応で生成し
た水と未反応の生石灰が反応して前記（１）式に従って
Ｃａ（ＯＨ）2が生成し、このＣａ（ＯＨ）2とｐＨ調整
ガス中のＣＯ2が反応してＣａＣＯ3が生成する。よっ
て、土壌の含水比を上昇させることなく、かつ短時間の
うちに、土壌中の水酸化カルシウムと未反応の生石灰を
除去して土壌のｐＨをｐＨが８前後の中性領域まで低下
させることができる。従って、汚染物質の浄化もしくは
粘性低下処理がなされた土壌に対して、その含水比を再
び上昇させることなく、土壌のｐＨを中性領域に低下さ
せることが可能になる。In particular, if the water content of the soil is lowered by mixing quicklime with the soil containing water, and then the pH-adjusting gas is brought into contact with the soil inclined toward the alkaline side by the mixing of the quicklime, the Ca (OH) 2 reacts with CO 2 in the pH adjusting gas to make Ca (OH) 2 more stable Ca
In addition to being converted to CO 3 , the water produced by the CaCO 3 producing reaction reacts with unreacted quicklime to produce Ca (OH) 2 according to the above formula (1), and the Ca (OH) 2 and the pH adjusting gas The CO 2 inside reacts to produce CaCO 3 . Therefore, without increasing the water content of the soil, and in a short time, removing calcium hydroxide and unreacted lime in the soil to lower the pH of the soil to a neutral region where the pH is around 8. Can be. Therefore, it is possible to lower the pH of the soil to a neutral region without increasing the water content ratio again of the soil on which the pollutants have been purified or the viscosity has been reduced.
【００１７】また、本発明に係るｐＨ調整方法におい
て、前記ｐＨ調整ガスとして、大気中のＣＯ2存在比率
を越える濃度で二酸化炭素ガスを含む排ガスを使用する
ことによって、排ガス中の二酸化炭素ガスを有効利用す
ることができるため、より省エネルギーで、かつ省資源
な方法で土壌のｐＨ調整を行うことができる。Further, in the pH adjusting method according to the present invention, by using an exhaust gas containing carbon dioxide gas at a concentration exceeding the CO 2 abundance ratio in the atmosphere as the pH adjusting gas, the carbon dioxide gas in the exhaust gas can be reduced. Since it can be used effectively, the pH of the soil can be adjusted in a more energy-saving and resource-saving manner.
【００１８】[0018]
【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１９】まず、本発明の実施例で使用するｐＨ調整
装置を図１を参照して説明する。図１は、本発明の実施
例で使用するｐＨ調整装置を示す模式図である。First, a pH adjusting device used in an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing a pH adjusting device used in an embodiment of the present invention.
【００２０】円筒型の土壌充填容器１には、ｐＨ調整が
なされる土壌が充填される。土壌充填容器１の下端に
は、漏斗形状をした連結部２が接続されている。連結部
２には、ガスパイプ３が接続されており、このガスパイ
プ３は、ｐＨ調整ガスが充填されているガスボンベ４に
接続されている。The cylindrical soil filling container 1 is filled with soil whose pH is to be adjusted. A connection part 2 having a funnel shape is connected to a lower end of the soil filling container 1. A gas pipe 3 is connected to the connecting portion 2, and the gas pipe 3 is connected to a gas cylinder 4 filled with a pH adjusting gas.
【００２１】（実施例１） ＜生石灰の混合＞含水比が６６．４％で、かつｐＨが
７．６の土壌１００重量部に対して生石灰１０重量部を
混合し、反応熱により上昇した土壌温度が室温に戻って
から土壌の含水比及びｐＨを測定し、その結果を下記表
１に示す。なお、土壌の含水比は、下記（３）式により
算出される。(Example 1) <Mixing of quicklime> Soil of 106.4 parts by weight of quicklime was mixed with 100 parts by weight of soil having a water content of 66.4% and a pH of 7.6, and the soil was heated by reaction heat. After the temperature returned to room temperature, the water content and pH of the soil were measured, and the results are shown in Table 1 below. The water content of the soil is calculated by the following equation (3).
【００２２】 土壌の含水比（％）＝（Ｗ1／Ｗ2）×１００ （３） 但し、（３）式において、Ｗ1は土壌中の水分重量
（ｇ）で、Ｗ2は土壌中の固形分重量（ｇ）を示す。Soil moisture content (%) = (W 1 / W 2 ) × 100 (3) In the equation (3), W 1 is the weight of water in the soil (g), and W 2 is the weight of the soil. Indicates the solid content weight (g).
【００２３】また、土壌のｐＨは、下記に説明する方法
で測定される。The soil pH is measured by the method described below.
【００２４】ＪＳＦＴ２２１に準じ、粒径を考慮して適
量の試料を清浄なビーカーに入れ、試料の炉乾燥質量に
対する水の質量比が２〜３になるように蒸留水を加え
る。それを攪拌棒でときほぐし、懸濁液の状態にして３
０分以上静置する。その後、ビーカー内の試料液のｐＨ
をｐＨ計で測定する。According to JSFT221, an appropriate amount of a sample is placed in a clean beaker in consideration of the particle size, and distilled water is added so that the mass ratio of the sample to the oven-dried mass becomes 2-3. Unravel it with a stirrer to make a suspension.
Let stand for at least 0 minutes. Then, the pH of the sample solution in the beaker
Is measured with a pH meter.
【００２５】＜ｐＨ調整＞生石灰混合後の土壌をｐＨ調
整装置の土壌充填容器１に充填すると共に、ｐＨ調整ガ
スとして二酸化炭素ガスを用意した。ガスボンベ４内の
二酸化炭素ガスをガスパイプ３を通じて連結部２へ送
り、二酸化炭素ガスを土壌充填容器１の下端から上端側
に流通させた。二酸化炭素ガスの流通は、流通速度を１
分間に２．０Ｌとして６０分間行った。その後、土壌充
填容器１から土壌を取り出し、含水比及びｐＨを測定
し、その結果を下記表１に併記する。<Adjustment of pH> The soil after the quicklime was mixed was filled in the soil filling container 1 of the pH adjustment device, and carbon dioxide gas was prepared as a pH adjustment gas. The carbon dioxide gas in the gas cylinder 4 was sent to the connecting part 2 through the gas pipe 3, and the carbon dioxide gas was circulated from the lower end to the upper end of the soil filling container 1. The circulation rate of carbon dioxide gas is 1
Performed for 60 minutes at 2.0 L per minute. Thereafter, the soil was taken out of the soil filling container 1, the water content and the pH were measured, and the results are shown in Table 1 below.
【００２６】（実施例２〜３）実施例１と同様にして生
石灰の混合を行った土壌に対して、下記表１に示す組成
のｐＨ調整ガスを用いること以外は前述した実施例１と
同様な方法により土壌のｐＨ調整を行い、土壌の含水比
及びｐＨを測定し、その結果を下記表１に併記する。(Examples 2 and 3) The same as Example 1 except that a pH adjusting gas having the composition shown in Table 1 below was used for soil mixed with quicklime as in Example 1. The pH of the soil was adjusted by various methods, the water content and the pH of the soil were measured, and the results are shown in Table 1 below.
【００２７】（実施例４）実施例１と同様にして生石灰
の混合を行った土壌に対して、下記表１に示す組成を有
する排ガスをｐＨ調整ガスとして用いること以外は前述
した実施例１と同様な方法により土壌のｐＨ調整を行
い、土壌の含水比及びｐＨを測定し、その結果を下記表
１に併記する。Example 4 The same procedure as in Example 1 was carried out except that flue gas having the composition shown in Table 1 below was used as a pH adjusting gas for soil mixed with quicklime in the same manner as in Example 1. The pH of the soil was adjusted by the same method, and the water content and the pH of the soil were measured. The results are shown in Table 1 below.
【００２８】（比較例１）実施例１と同様にして生石灰
の混合を行った土壌に対して、下記表１に示す組成の大
気をｐＨ調整ガスとして用いること以外は前述した実施
例１と同様な方法により土壌のｐＨ調整を行い、土壌の
含水比及びｐＨを測定し、その結果を下記表１に併記す
る。(Comparative Example 1) The same as Example 1 described above, except that the air having the composition shown in Table 1 below was used as a pH adjusting gas for soil mixed with quicklime as in Example 1. The pH of the soil was adjusted by various methods, the water content and the pH of the soil were measured, and the results are shown in Table 1 below.
【００２９】（比較例２）実施例１と同様にして生石灰
の混合を行った。この土壌１００重量部に対して濃度が
１２ｍｏｌ／Ｌの塩酸水溶液０．０３重量部をスプレー
散布した後、土壌の含水比及びｐＨを測定し、その結果
を下記表１に併記する。Comparative Example 2 Quick lime was mixed in the same manner as in Example 1. After spraying 0.03 parts by weight of a 12 mol / L aqueous hydrochloric acid solution to 100 parts by weight of the soil, the water content and pH of the soil were measured, and the results are also shown in Table 1 below.
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１から明らかなように、大気中のＣＯ2
存在比率を超える濃度で二酸化炭素ガスを含むｐＨ調整
ガスをＣａ（ＯＨ）2含有土壌に接触させる実施例１〜
４のｐＨ調整方法によると、生石灰の混合により低下し
た含水比を上昇させることなく、生石灰混合後の土壌の
ｐＨを短時間のうちにｐＨが８前後の中性領域に低下さ
せることができる。As is clear from Table 1, CO 2 in the atmosphere
Example 1 in which a pH-adjusting gas containing carbon dioxide gas at a concentration exceeding the abundance ratio is brought into contact with Ca (OH) 2 -containing soil
According to the pH adjusting method of No. 4, the pH of the soil after the mixing of quick lime can be reduced to a neutral region where the pH is around 8 in a short time without increasing the water content reduced by the mixing of quick lime.
【００３２】これに対し、Ｃａ（ＯＨ）2含有土壌に大
気を接触させる比較例１のｐＨ調整方法によると、実施
例と同様な処理時間では生石灰混合後の土壌のｐＨがほ
とんど低下しないことがわかる。また、Ｃａ（ＯＨ）2
含有土壌に塩酸水溶液を噴霧する比較例２のｐＨ調整方
法によると、生石灰混合後の土壌のｐＨが低下するもの
の、塩酸水溶液中の水分により土壌の含水比が再び上昇
することがわかる。On the other hand, according to the pH adjusting method of Comparative Example 1 in which the air is brought into contact with the Ca (OH) 2 -containing soil, the pH of the soil after mixing with quick lime hardly decreases during the same treatment time as in the example. Understand. In addition, Ca (OH) 2
According to the pH adjustment method of Comparative Example 2 in which the aqueous solution of hydrochloric acid is sprayed on the soil containing the solution, although the pH of the soil after the mixing of quicklime decreases, the water content of the soil increases again due to the water in the aqueous solution of hydrochloric acid.
【００３３】なお、前述した実施例においては、土壌を
充填した土壌充填容器の下方からｐＨ調整ガスを導入し
たが、土壌充填容器の上方からｐＨ調整ガスを導入した
り、あるいは土壌充填容器を水平に配置し、土壌充填容
器の一端からｐＨ調整ガスを導入しても良い。In the above-described embodiment, the pH adjusting gas is introduced from below the soil-filled container filled with soil. However, the pH-adjusting gas is introduced from above the soil-filled container, or the soil-filled container is placed horizontally. And a pH adjusting gas may be introduced from one end of the soil filling container.
【００３４】[0034]
【発明の効果】本発明に係る土壌のｐＨの調整方法によ
れば、Ｃａ（ＯＨ）2を含有する土壌のｐＨを、含水比
を上昇させずに低下させることができるため、粘性低下
処理並びに汚染物質の浄化処理のような土壌処理を効率
良く行うことができる等の顕著な効果を奏する。従っ
て、本発明に係る土壌のｐＨの調整方法は、環境対策に
有効な技術であり、工業的な価値は大である。According to the method of adjusting the pH of soil according to the present invention, the pH of soil containing Ca (OH) 2 can be reduced without increasing the water content, and therefore the viscosity reduction treatment and It has a remarkable effect that soil treatment such as purification of pollutants can be performed efficiently. Therefore, the method for adjusting soil pH according to the present invention is an effective technique for environmental measures, and has great industrial value.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の実施例で使用するｐＨ調整装置を示す
模式図。FIG. 1 is a schematic diagram showing a pH adjusting device used in an embodiment of the present invention.
１…土壌充填容器、 ２…連結部、 ３…ガスパイプ、 ４…ガスボンベ。 1 ... soil filling container, 2 ... connecting part, 3 ... gas pipe, 4 ... gas cylinder.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｅ０２Ｄ 3/00 １０１ Ｆターム(参考） 2D043 CA01 EA04 EA10 4D002 AA09 BA03 DA05 DA12 4D004 AA41 AB06 CA15 CA35 CC01 CC12 DA02 DA09 4H026 AA01 AA03 AB04 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) E02D 3/00 101 F-term (Reference) 2D043 CA01 EA04 EA10 4D002 AA09 BA03 DA05 DA12 4D004 AA41 AB06 CA15 CA35 CC01 CC12 DA02 DA09 4H026 AA01 AA03 AB04
Claims (3)
含有する土壌に、二酸化炭素（ＣＯ2）ガスを含むｐＨ
調整ガスを接触させることにより前記土壌中のＣａ（Ｏ
Ｈ）2と前記ｐＨ調整ガス中のＣＯ2を反応させ、前記土
壌のｐＨを低下させることを特徴とする土壌のｐＨの調
整方法。Claims: 1. A soil containing calcium hydroxide (Ca (OH) 2 ) containing carbon dioxide (CO 2 ) gas
By contacting the conditioning gas, Ca (O
H) 2 and the reacting the CO 2 in the pH adjustment in the gas, pH adjusters method of soil, characterized in that lowering the pH of the soil.
は、水分を含有する土壌に生石灰を混合することにより
得られることを特徴とする請求項１記載の土壌のｐＨの
調整方法。2. The method for adjusting the pH of soil according to claim 1, wherein the soil containing calcium hydroxide is obtained by mixing quicklime with a soil containing water.
特徴とする請求項１記載の土壌のｐＨの調整方法。3. The method according to claim 1, wherein the pH adjusting gas is an exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000401935A JP2002201472A (en) | 2000-12-28 | 2000-12-28 | METHOD FOR ADJUSTING pH OF SOIL |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000401935A JP2002201472A (en) | 2000-12-28 | 2000-12-28 | METHOD FOR ADJUSTING pH OF SOIL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002201472A true JP2002201472A (en) | 2002-07-19 |
Family
ID=18866303
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000401935A Abandoned JP2002201472A (en) | 2000-12-28 | 2000-12-28 | METHOD FOR ADJUSTING pH OF SOIL |
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| Country | Link |
|---|---|
| JP (1) | JP2002201472A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020025925A (en) * | 2018-08-10 | 2020-02-20 | 五洋建設株式会社 | Landfill method of waste disposal site |
-
2000
- 2000-12-28 JP JP2000401935A patent/JP2002201472A/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020025925A (en) * | 2018-08-10 | 2020-02-20 | 五洋建設株式会社 | Landfill method of waste disposal site |
| JP7075310B2 (en) | 2018-08-10 | 2022-05-25 | 五洋建設株式会社 | Landfill method for waste disposal site |
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