JPH10180300A - Treatment of heavy metal-containing sludge or mud - Google Patents
Treatment of heavy metal-containing sludge or mudInfo
- Publication number
- JPH10180300A JPH10180300A JP8356254A JP35625496A JPH10180300A JP H10180300 A JPH10180300 A JP H10180300A JP 8356254 A JP8356254 A JP 8356254A JP 35625496 A JP35625496 A JP 35625496A JP H10180300 A JPH10180300 A JP H10180300A
- Authority
- JP
- Japan
- Prior art keywords
- mud
- sludge
- heavy metal
- fibrous material
- added
- 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
Landscapes
- Fire-Extinguishing Compositions (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、重金属を含有する汚泥
又は泥土の処理方法に関する。さらに詳しくは、本発明
は、重金属を含有するヘドロ・スラッジ類や掘削泥土
を、容易かつ効率的に、しかも安全に処理して、処理土
からの重金属の溶出を確実に防止することができる重金
属を含有する汚泥又は泥土の処理方法に関する。The present invention relates to a method for treating sludge or mud containing heavy metals. More specifically, the present invention provides a heavy metal capable of easily and efficiently and safely treating sludge and sludge or excavated mud containing heavy metal to prevent elution of heavy metal from the treated soil. The present invention relates to a method for treating sludge or mud containing.
【０００２】[0002]
【従来の技術】ヘドロ・スラッジ類や掘削泥土は、数カ
月間中間処理場で自然脱水したり、石灰又はセメント系
の固化剤を混合し、あるいは水溶性高分子化合物や高吸
水性樹脂を混合して処理されている。これらの処理土
は、埋立てや地盤工事などに有効に利用されている。し
かし、ヘドロ・スラッジ類や掘削泥土は、重金属を含有
する場合があり、土壌汚染防止法においても、カドミウ
ム、銅、鉛などの重金属が防除事業の対象とされてい
る。したがって、このような重金属を含有する汚泥や泥
土を処理土として埋立てなどに利用するに当たっては、
処理土中の重金属の溶出を防止する処理を施す必要があ
る。従来、重金属を含有するヘドロ・スラッジ類や掘削
泥土中の重金属溶出防止法として、溶融法、セメント固
化法、酸又はその他の溶媒による抽出法、薬剤処理法な
どが多数提案されているが、設備、運転管理、処理コス
トなどの面からも満足でき、容易かつ効率的に汚泥や泥
土を処理して、処理土からの重金属の溶出を確実に防止
し得る処理方法は未だ開発されていない。BACKGROUND ART Sludge and sludge and excavated mud are naturally dehydrated in an intermediate treatment plant for several months, mixed with a lime or cement type solidifying agent, or mixed with a water-soluble polymer compound or a superabsorbent resin. Has been processed. These treated soils are effectively used for landfills and ground works. However, sludge sludge and excavated mud may contain heavy metals, and the Soil Contamination Prevention Law also targets heavy metals such as cadmium, copper, and lead. Therefore, when using such sludge or mud containing heavy metals as landfill for treatment,
It is necessary to perform a treatment for preventing the elution of heavy metals in the treated soil. Conventionally, many methods have been proposed to prevent the elution of heavy metals in sludge and sludge containing excavated mud, such as melting, cement solidification, extraction with acids or other solvents, and chemical treatment. No treatment method has yet been developed that is satisfactory in terms of operation management, treatment cost, etc., and that can easily and efficiently treat sludge and mud and reliably prevent heavy metals from being eluted from treated soil.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、重金属を含
有するヘドロ・スラッジ類や掘削泥土を、容易かつ効率
的に、しかも安全に処理して、処理土からの重金属の溶
出を確実に防止することができる、重金属を含有する汚
泥又は泥土の処理方法を提供することを目的としてなさ
れたものである。DISCLOSURE OF THE INVENTION The present invention aims to easily and efficiently and safely treat sludge and sludge containing heavy metals and excavated mud to prevent elution of heavy metals from the treated soil. It is an object of the present invention to provide a method for treating sludge or mud containing a heavy metal.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記の課
題を解決すべく鋭意研究を重ねた結果、重金属を含有す
る汚泥又は泥土に、有機性繊維物質とリン酸又はその塩
を加えて混練することにより、容易に重金属を固定化し
て、処理土からの重金属の溶出を確実に防止し得ること
を見いだし、この知見に基づいて本発明を完成するに至
った。すなわち、本発明は、（１）重金属を含有する汚
泥又は泥土に、有機性繊維物質とリン酸又はその塩を加
えて混練し、汚泥又は泥土中の重金属を固定化すること
を特徴とする重金属を含有する汚泥又は泥土の処理方
法、を提供するものである。さらに、本発明の好ましい
態様として、（２）有機性繊維物質が、おが屑である第
(１)項記載の重金属を含有する汚泥又は泥土の処理方
法、（３）有機性繊維物質が、椰子屑（Ｃｏｉｒ ｐｉ
ｔｈ）である第(１)項記載の重金属を含有する汚泥又は
泥土の処理方法、及び、（４）リン酸又はその塩が、正
リン酸又はそのナトリウム塩である第(１)項記載の重金
属を含有する汚泥又は泥土の処理方法、を挙げることが
できる。Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have added an organic fiber substance and phosphoric acid or a salt thereof to sludge or mud containing heavy metals. It has been found that by kneading, the heavy metal can be easily fixed and the elution of the heavy metal from the treated soil can be reliably prevented, and the present invention has been completed based on this finding. That is, the present invention is characterized in that (1) an organic fiber substance and phosphoric acid or a salt thereof are added to sludge or mud containing heavy metal and kneaded to fix the heavy metal in the sludge or mud. And a method for treating sludge or mud containing the same. Furthermore, as a preferred embodiment of the present invention, (2) the organic fiber substance is a sawdust
(1) The method for treating sludge or mud containing a heavy metal according to the item (3), (3) the organic fiber substance is a coconut refuse (Coir pi)
(3) The method for treating sludge or mud containing the heavy metal according to (1), which is (th), and (4) the phosphoric acid or its salt is orthophosphoric acid or its sodium salt. A method for treating sludge or mud containing a heavy metal can be used.
【０００５】[0005]
【発明の実施の形態】本発明方法は、建設工事、土木工
事、浚渫工事などにおいて発生する重金属を含有するヘ
ドロ・スラッジ類や掘削泥土の処理に適用することがで
きる。本発明方法により処理することができる重金属と
しては、例えば、銅、亜鉛、鉛、カドミウム、マンガ
ン、鉄、ニッケル、コバルト、ヒ素、アンチモン、錫、
ビスマス、クロム、水銀、モリブデン、タングステン、
バナジウムなどを挙げることができる。本発明方法にお
いては、重金属を含有する汚泥又は泥土に、有機性繊維
物質とリン酸又はその塩を加えて混練する。本発明方法
において使用する有機性繊維物質としては、例えば、椰
子屑（Ｃｏｉｒ ｐｉｔｈ）、メカニカルパルプ、ケミ
カルパルプ、再生パルプ、木綿、おが屑、ジュート、大
麻、亜麻、ラミー、マニラ麻、サイザル麻、パイナップ
ル繊維、バナナ繊維、カポック、綿、しゅろ繊維、い草
などの天然有機性繊維物質、レーヨン、アセテートなど
の再生有機性繊維物質、ポリエステル、ポリアミド、ア
クリル、ポリビニルアルコール、ポリオレフィン、ポリ
ウレタンなどの合成有機性繊維物質などを挙げることが
できる。これらの中で、天然有機性繊維物質を好ましく
用いることができ、椰子屑及びおが屑を特に好ましく用
いることができる。椰子屑とは、ココヤシの実の中果皮
より繊維を採取したあとに残される、通常淡褐色ないし
暗褐色の短繊維状ないし粉状物質であり、その性状など
は、Ａｌａｎ Ｗ．Ｍｅｅｒｏｗによって、「Ｔｒｏｐ
ｉｃＬｉｎｅ」第６巻、第２号、１〜４頁（１９９３
年）に紹介されているが、多量のリグニンおよびセルロ
ースを含有し、吸水性を有する多孔性の物質である。本
発明方法においては、有機性繊維物質は、１種を単独で
使用することができ、２種以上を組み合わせて使用する
ことができる。本発明方法において、有機性繊維物質の
添加量は、重金属を含有する汚泥又は泥土１００重量部
に対して０.１〜５０重量部であることが好ましく、０.
５〜１０重量部であることがより好ましい。有機性繊維
物質の添加量が重金属を含有する汚泥又は泥土１００重
量部に対して０.１重量部未満であると、汚泥又は泥土
中の重金属を安定して固定化することが困難となるおそ
れがある。有機性繊維物質の添加量は、汚泥又は泥土１
００重量部に対して５０重量部であれば重金属の固定化
のためには十分であり、５０重量部を超える添加は通常
は不必要である。また、汚泥又は泥土１００重量部に対
して５０重量部を超える有機性繊維物質を添加すると、
混練が容易でなくなるおそれがある。DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention can be applied to the treatment of sludge and sludge containing heavy metals generated in construction works, civil works, dredging works and the like and excavated mud. Heavy metals that can be treated by the method of the present invention include, for example, copper, zinc, lead, cadmium, manganese, iron, nickel, cobalt, arsenic, antimony, tin,
Bismuth, chromium, mercury, molybdenum, tungsten,
Vanadium and the like can be mentioned. In the method of the present invention, an organic fiber substance and phosphoric acid or a salt thereof are added to sludge or mud containing a heavy metal and kneaded. Organic fiber materials used in the method of the present invention include, for example, coconut waste (Coir pit), mechanical pulp, chemical pulp, recycled pulp, cotton, sawdust, jute, hemp, flax, ramie, manila hemp, sisal hemp, pineapple fiber , Banana fiber, kapok, cotton, tallow fiber, natural organic fiber material such as rush, regenerated organic fiber material such as rayon, acetate, etc., synthetic organic fiber such as polyester, polyamide, acrylic, polyvinyl alcohol, polyolefin, polyurethane, etc. Substances and the like can be mentioned. Among these, natural organic fiber substances can be preferably used, and coconut dust and sawdust can be particularly preferably used. Coconut dust is short-fibrous or powdery substance, usually light brown or dark brown, remaining after collecting fibers from the mesocarp of coconut palm. According to Meerow, "Trop
icLine ", Vol. 6, No. 2, pp. 1-4 (1993)
This is a porous material that contains a large amount of lignin and cellulose and has water absorption. In the method of the present invention, one kind of the organic fiber substance can be used alone, or two or more kinds can be used in combination. In the method of the present invention, the addition amount of the organic fiber substance is preferably 0.1 to 50 parts by weight, and more preferably 0.1 to 50 parts by weight based on 100 parts by weight of the sludge or mud containing the heavy metal.
More preferably, it is 5 to 10 parts by weight. If the amount of the organic fiber substance is less than 0.1 part by weight based on 100 parts by weight of the sludge or mud containing heavy metal, it may be difficult to stably fix the heavy metal in the sludge or mud. There is. The amount of organic fiber substance added is sludge or mud 1
50 parts by weight relative to 00 parts by weight is sufficient for immobilizing heavy metals, and addition exceeding 50 parts by weight is usually unnecessary. Further, when an organic fiber substance exceeding 50 parts by weight is added to 100 parts by weight of sludge or mud,
Kneading may not be easy.
【０００６】本発明方法において使用するリン酸として
は、例えば、正リン酸（Ｈ3ＰＯ4）、次亜リン酸（Ｈ3
ＰＯ2）、メタ亜リン酸（ＨＰＯ2）、ピロ亜リン酸（Ｈ
4Ｐ2Ｏ5）、正亜リン酸（Ｈ3ＰＯ3）、次リン酸（Ｈ4Ｐ
2Ｏ6）、メタリン酸（ＨＰＯ3）、ピロリン酸（Ｈ4Ｐ2
Ｏ7）、三リン酸（Ｈ5Ｐ3Ｏ10）、その他の縮合リン酸
などを挙げることができ、リン酸の塩としては、これら
のリン酸のナトリウム塩、カリウム塩、アンモニウム塩
などを挙げることができる。これらの中で、正リン酸
（Ｈ3ＰＯ4）、リン酸二水素ナトリウム（ＮａＨ2Ｐ
Ｏ4）及びリン酸水素二ナトリウム（Ｎａ2ＨＰＯ4）を
好適に使用することができる。本発明方法において、リ
ン酸又はその塩は、１種を単独で使用することができ、
２種以上を組み合わせて使用することができる。本発明
方法において、リン酸又はその塩の添加量は、重金属を
含有する汚泥又は泥土１００重量部に対して０.１〜２
０重量部であることが好ましく、０.５〜１０重量部で
あることがより好ましい。リン酸又はその塩の添加量が
重金属を含有する汚泥又は泥土１００重量部に対して
０.１重量部未満であると、汚泥又は泥土中の重金属を
安定して固定化することが困難となるおそれがある。リ
ン酸又はその塩の添加量は、汚泥又は泥土１００重量部
に対して２０重量部であれば重金属の固定化のためには
十分であり、２０重量部を超える添加は通常は不必要で
ある。本発明方法においては、重金属を含有する汚泥又
は泥土に、有機性繊維物質とリン酸又はその塩を加えた
のち、混練する。有機性繊維物質とリン酸又はその塩を
加えた汚泥又は泥土を混練する方法には特に制限はな
く、処理すべき汚泥又は泥土の性状及び量に応じて適当
な建設機械などを選択することができる。このような機
械としては、例えば、パワーショベル、ドラグショベ
ル、バックホウなどを挙げることができる。本発明方法
によれば、汚泥又は泥土中に存在する重金属が、そのま
ま有機性繊維物質の表面及び繊維構造内部に吸着されて
固定化されるほかに、汚泥又は泥土中に存在する重金属
が、水難溶性のリン酸塩となって有機性繊維物質の表面
及び繊維構造内部に吸着されて固定化されるので、汚泥
又は泥土中の重金属を安定して確実に固定化することが
できる。[0006] As the phosphate used in the method of the present invention, for example, orthophosphoric acid (H 3 PO 4), hypophosphorous acid (H 3
PO 2 ), metaphosphorous acid (HPO 2 ), pyrophosphorous acid (H
4 P 2 O 5 ), orthophosphorous acid (H 3 PO 3 ), hypophosphoric acid (H 4 P
2 O 6 ), metaphosphoric acid (HPO 3 ), pyrophosphoric acid (H 4 P 2
O 7 ), triphosphoric acid (H 5 P 3 O 10 ), and other condensed phosphoric acids. Examples of the phosphoric acid salts include sodium, potassium, and ammonium salts of these phosphoric acids. Can be mentioned. Among these, orthophosphoric acid (H 3 PO 4 ), sodium dihydrogen phosphate (NaH 2 P)
O 4 ) and disodium hydrogen phosphate (Na 2 HPO 4 ) can be suitably used. In the method of the present invention, phosphoric acid or a salt thereof may be used alone,
Two or more can be used in combination. In the method of the present invention, the amount of phosphoric acid or a salt thereof is 0.1 to 2 parts by weight based on 100 parts by weight of sludge or mud containing heavy metals.
It is preferably 0 parts by weight, more preferably 0.5 to 10 parts by weight. If the amount of phosphoric acid or a salt thereof is less than 0.1 part by weight based on 100 parts by weight of sludge or mud containing heavy metals, it becomes difficult to stably fix heavy metals in sludge or mud. There is a risk. An addition amount of phosphoric acid or a salt thereof of 20 parts by weight per 100 parts by weight of sludge or mud is sufficient for immobilization of heavy metals, and addition in excess of 20 parts by weight is usually unnecessary. . In the method of the present invention, an organic fiber substance and phosphoric acid or a salt thereof are added to sludge or mud containing a heavy metal and then kneaded. There is no particular limitation on the method of kneading the sludge or mud added with the organic fiber substance and phosphoric acid or a salt thereof, and it is possible to select an appropriate construction machine according to the properties and amount of the sludge or mud to be treated. it can. Examples of such a machine include a power shovel, a drag shovel, and a backhoe. According to the method of the present invention, in addition to the heavy metal present in the sludge or mud being adsorbed and fixed on the surface of the organic fiber material and the inside of the fiber structure as it is, the heavy metal present in the sludge or mud is protected from water Since it becomes a soluble phosphate and is adsorbed and fixed on the surface of the organic fiber material and the inside of the fiber structure, it is possible to stably and reliably fix heavy metals in sludge or mud.
【０００７】[0007]
【実施例】以下に、実施例を挙げて本発明をさらに詳細
に説明するが、本発明はこれらの実施例によりなんら限
定されるものではない。 実施例１ 含水率が５６.７重量％で、鉛３０.４mg／kg−ＤＳ（乾
燥固形物）、カドミウム３.８mg／kg−ＤＳ、クロム２.
５mg／kg−ＤＳ、全水銀０.４mg／kg−ＤＳ、ヒ素５.７
mg／kg−ＤＳ、銅２０.９mg／kg−ＤＳ及び亜鉛４７.１
mg／kg−ＤＳを含有する浚渫泥土５０ｇを、容量５００
mlのポリビーカーに採り、おが屑０.５ｇ及び正リン酸
１.０ｇを添加して、スパーテルを用いて十分に混練し
た。この処理土について環境庁告示４６号試験に準じて
溶出試験を行ったところ、鉛の溶出量は０.１２mg／リ
ットルであり、カドミウムの溶出量は０.０３mg／リッ
トルであった。 実施例２ おが屑の添加量を１.５ｇとした以外は、実施例１と同
じ操作を繰り返した。鉛の溶出量は０.０５mg／リット
ルであり、カドミウムの溶出量は０.０２mg／リットル
であった。 実施例３ おが屑の添加量を２.５ｇとした以外は、実施例１と同
じ操作を繰り返した。鉛の溶出量も、カドミウムの溶出
量も、いずれも０.０１mg／リットル以下であった。 比較例１ おが屑０.５ｇ及び正リン酸１.０ｇの代わりに、おが屑
０.５ｇのみを添加した以外は、実施例１と同じ操作を
繰り返した。鉛の溶出量は０.４３mg／リットルであ
り、カドミウムの溶出量は０.１０mg／リットルであっ
た。 比較例２ おが屑の添加量を１.５ｇとした以外は、比較例１と同
じ操作を繰り返した。鉛の溶出量は０.１５mg／リット
ルであり、カドミウムの溶出量は０.０５mg／リットル
であった。 比較例３ おが屑の添加量を２.５ｇとした以外は、比較例１と同
じ操作を繰り返した。鉛の溶出量は０.０８mg／リット
ルであり、カドミウムの溶出量は０.０３mg／リットル
であった。 比較例４ おが屑０.５ｇ及び正リン酸１.０ｇの代わりに、正リン
酸１.０ｇのみを添加した以外は、実施例１と同じ操作
を繰り返した。鉛の溶出量は０.７２mg／リットルであ
り、カドミウムの溶出量は０.１１mg／リットルであっ
た。 比較例５ 正リン酸の添加量を２.５ｇとした以外は、比較例４と
同じ操作を繰り返した。鉛の溶出量は０.４６mg／リッ
トルであり、カドミウムの溶出量は０.０７mg／リット
ルであった。 比較例６ 正リン酸の添加量を４.０ｇとした以外は、比較例４と
同じ操作を繰り返した。鉛の溶出量は０.１２mg／リッ
トルであり、カドミウムの溶出量は０.０３mg／リット
ルであった。 比較例７ 実施例１と同じ泥土５０ｇを、容量５００mlのポリビー
カーに採り、おが屑及び正リン酸を添加せずに、スパー
テルを用いる混練のみを行ったのち、実施例１と同様に
して溶出試験を行ったところ、鉛の溶出量は１.２４mg
／リットルであり、カドミウムの溶出量は０.１６mg／
リットルであった。実施例１〜３及び比較例１〜７の結
果を第１表に示す。EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. Example 1 Lead 30.4 mg / kg-DS (dry solid), cadmium 3.8 mg / kg-DS, chromium 2.
5 mg / kg-DS, total mercury 0.4 mg / kg-DS, arsenic 5.7
mg / kg-DS, copper 20.9 mg / kg-DS and zinc 47.1
mg / kg-DS containing 50 g of dredged mud
The mixture was placed in a ml beaker, 0.5 g of sawdust and 1.0 g of orthophosphoric acid were added, and the mixture was sufficiently kneaded using a spatula. When a dissolution test was performed on this treated soil in accordance with the Environment Agency Notification No. 46 test, the lead elution amount was 0.12 mg / l and the cadmium elution amount was 0.03 mg / l. Example 2 The same operation as in Example 1 was repeated, except that the amount of sawdust added was 1.5 g. The elution amount of lead was 0.05 mg / l, and the elution amount of cadmium was 0.02 mg / l. Example 3 The same operation as in Example 1 was repeated, except that the amount of sawdust added was 2.5 g. Both the elution amount of lead and the elution amount of cadmium were 0.01 mg / liter or less. Comparative Example 1 The same operation as in Example 1 was repeated, except that only 0.5 g of sawdust was added instead of 0.5 g of sawdust and 1.0 g of orthophosphoric acid. The elution amount of lead was 0.43 mg / l, and the elution amount of cadmium was 0.10 mg / l. Comparative Example 2 The same operation as in Comparative Example 1 was repeated, except that the amount of sawdust added was 1.5 g. The elution amount of lead was 0.15 mg / l, and the elution amount of cadmium was 0.05 mg / l. Comparative Example 3 The same operation as in Comparative Example 1 was repeated, except that the amount of sawdust added was 2.5 g. The elution amount of lead was 0.08 mg / l, and the elution amount of cadmium was 0.03 mg / l. Comparative Example 4 The same operation as in Example 1 was repeated, except that only 1.0 g of orthophosphoric acid was added instead of 0.5 g of sawdust and 1.0 g of orthophosphoric acid. The elution amount of lead was 0.72 mg / liter, and the elution amount of cadmium was 0.11 mg / liter. Comparative Example 5 The same operation as in Comparative Example 4 was repeated, except that the amount of orthophosphoric acid was changed to 2.5 g. The elution amount of lead was 0.46 mg / liter, and the elution amount of cadmium was 0.07 mg / liter. Comparative Example 6 The same operation as in Comparative Example 4 was repeated, except that the amount of orthophosphoric acid was changed to 4.0 g. The elution amount of lead was 0.12 mg / l, and the elution amount of cadmium was 0.03 mg / l. Comparative Example 7 50 g of the same mud as in Example 1 was taken in a polybeaker having a capacity of 500 ml, and only kneading using a spatula was performed without adding sawdust and orthophosphoric acid. The lead elution amount was 1.24 mg.
/ Liter and the elution amount of cadmium is 0.16 mg / liter.
Liters. Table 1 shows the results of Examples 1 to 3 and Comparative Examples 1 to 7.
【０００８】[0008]
【表１】 [Table 1]
【０００９】泥土におが屑及び正リン酸を加えて混練し
た実施例１〜３においては、溶出試験における鉛及びカ
ドミウムの溶出量が少なく、特に泥土１００重量部に対
しておが屑５重量部と正リン酸２重量部を加えた実施例
３では、鉛の溶出量及びカドミウムの溶出量がともに
０.０１mg／リットル以下となった。これに対して、お
が屑のみを加えた比較例１〜３及び正リン酸のみを加え
た比較例４〜６においては、おが屑も正リン酸も加えな
かった比較例７に比べると鉛及びカドミウムの溶出量は
少なくなっているが、おが屑と正リン酸を加えた実施例
に比べると鉛及びカドミウムの溶出量が多く、おが屑と
正リン酸を併用する本発明の処理方法が重金属の固定化
に優れた効果を有することが分かる。 実施例４ 含水率が６１.１重量％で、鉛１８.３mg／kg−ＤＳ（乾
燥固形物）、カドミウム１.５mg／kg−ＤＳ、クロム０.
８mg／kg−ＤＳ、全水銀２.５mg／kg−ＤＳ、ヒ素３.３
mg／kg−ＤＳ、銅７.９mg／kg−ＤＳ及び亜鉛２８.４mg
／kg−ＤＳを含有する浚渫泥土５０ｇを、容量５００ml
のポリビーカーに採り、Ｃｏｉｒ ｐｉｔｈをコーヒー
ミルで乾式粉砕して得られた椰子屑０.５ｇ及び正リン
酸１.０ｇを添加して、スパーテルを用いて十分に混練
した。この処理土について環境庁告示４６号試験に準じ
て溶出試験を行ったところ、鉛の溶出量は０.０６mg／
リットルであり、カドミウムの溶出量は０.０２mg／リ
ットルであった。 実施例５ 椰子屑の添加量を１.５ｇとした以外は、実施例４と同
じ操作を繰り返した。鉛の溶出量も、カドミウムの溶出
量も、いずれも０.０１mg／リットル以下であった。 実施例６ 椰子屑の添加量を２.５ｇとした以外は、実施例４と同
じ操作を繰り返した。鉛の溶出量も、カドミウムの溶出
量も、いずれも０.０１mg／リットル以下であった。 比較例８ 椰子屑０.５ｇ及び正リン酸１.０ｇの代わりに、椰子屑
０.５ｇのみを添加した以外は、実施例４と同じ操作を
繰り返した。鉛の溶出量は０.１４mg／リットルであ
り、カドミウムの溶出量は０.０７mg／リットルであっ
た。 比較例９ 椰子屑の添加量を１.５ｇとした以外は、比較例８と同
じ操作を繰り返した。鉛の溶出量は０.１０mg／リット
ルであり、カドミウムの溶出量は０.０３mg／リットル
であった。 比較例１０ 椰子屑の添加量を２.５ｇとした以外は、比較例８と同
じ操作を繰り返した。鉛の溶出量は０.０５mg／リット
ルであり、カドミウムの溶出量は０.０２mg／リットル
であった。 比較例１１ 椰子屑０.５ｇ及び正リン酸１.０ｇの代わりに、正リン
酸１.０ｇのみを添加した以外は、実施例４と同じ操作
を繰り返した。鉛の溶出量は０.６３mg／リットルであ
り、カドミウムの溶出量は０.０８mg／リットルであっ
た。 比較例１２ 正リン酸の添加量を２.５ｇとした以外は、比較例１１
と同じ操作を繰り返した。鉛の溶出量は０.３８mg／リ
ットルであり、カドミウムの溶出量は０.０５mg／リッ
トルであった。 比較例１３ 正リン酸の添加量を４.０ｇとした以外は、比較例１１
と同じ操作を繰り返した。鉛の溶出量は０.０９mg／リ
ットルであり、カドミウムの溶出量は０.０２mg／リッ
トルであった。 比較例１４ 実施例４と同じ泥土５０ｇを、容量５００mlのポリビー
カーに採り、椰子屑及び正リン酸を添加せずに、スパー
テルを用いる混練のみを行ったのち、実施例４と同様に
して溶出試験を行ったところ、鉛の溶出量は０.８１mg
／リットルであり、カドミウムの溶出量は０.１０mg／
リットルであった。実施例４〜６及び比較例８〜１４の
結果を第２表に示す。In Examples 1 to 3 in which sawdust and orthophosphoric acid were added to the mud and kneaded, the amount of lead and cadmium dissolved in the elution test was small, and in particular, 5 wt. In Example 3 in which 2 parts by weight of the acid was added, the elution amount of lead and the elution amount of cadmium were both 0.01 mg / liter or less. On the other hand, in Comparative Examples 1 to 3 in which only sawdust was added and in Comparative Examples 4 to 6 in which only orthophosphoric acid was added, lead and cadmium were compared with Comparative Example 7 in which neither sawdust nor orthophosphoric acid was added. Although the elution amount is small, the elution amount of lead and cadmium is large compared to the example in which sawdust and orthophosphoric acid are added, and the treatment method of the present invention using both sawdust and orthophosphoric acid is used for immobilizing heavy metals. It turns out that it has an excellent effect. Example 4 A water content of 61.1% by weight, lead 18.3 mg / kg-DS (dry solid), cadmium 1.5 mg / kg-DS, chromium 0.1%.
8 mg / kg-DS, total mercury 2.5 mg / kg-DS, arsenic 3.3
mg / kg-DS, copper 7.9 mg / kg-DS and zinc 28.4 mg
/ Kg-DS containing 50 g of dredged mud
And 0.5 g of coconut dust and 1.0 g of orthophosphoric acid obtained by dry-pulverizing Coir pit with a coffee mill were added, and kneaded well using a spatula. When a dissolution test was performed on this treated soil in accordance with the Environment Agency Notification No. 46 test, the lead elution amount was 0.06 mg /
Liter and the elution amount of cadmium was 0.02 mg / liter. Example 5 The same operation as in Example 4 was repeated, except that the added amount of coconut dust was 1.5 g. Both the elution amount of lead and the elution amount of cadmium were 0.01 mg / liter or less. Example 6 The same operation as in Example 4 was repeated, except that the added amount of coconut dust was 2.5 g. Both the elution amount of lead and the elution amount of cadmium were 0.01 mg / liter or less. Comparative Example 8 The same operation as in Example 4 was repeated except that only 0.5 g of coconut dust was added instead of 0.5 g of coconut dust and 1.0 g of orthophosphoric acid. The elution amount of lead was 0.14 mg / l, and the elution amount of cadmium was 0.07 mg / l. Comparative Example 9 The same operation as in Comparative Example 8 was repeated, except that the added amount of the coconut dust was 1.5 g. The elution amount of lead was 0.10 mg / l, and the elution amount of cadmium was 0.03 mg / l. Comparative Example 10 The same operation as in Comparative Example 8 was repeated, except that the addition amount of the coconut dust was 2.5 g. The elution amount of lead was 0.05 mg / l, and the elution amount of cadmium was 0.02 mg / l. Comparative Example 11 The same operation as in Example 4 was repeated, except that only 1.0 g of normal phosphoric acid was added instead of 0.5 g of coconut dust and 1.0 g of normal phosphoric acid. The elution amount of lead was 0.63 mg / l, and the elution amount of cadmium was 0.08 mg / l. Comparative Example 12 Comparative Example 11 was conducted except that the amount of orthophosphoric acid was changed to 2.5 g.
The same operation was repeated. The elution amount of lead was 0.38 mg / liter, and the elution amount of cadmium was 0.05 mg / liter. Comparative Example 13 Comparative Example 11 was conducted except that the amount of orthophosphoric acid was changed to 4.0 g.
The same operation was repeated. The elution amount of lead was 0.09 mg / l, and the elution amount of cadmium was 0.02 mg / l. Comparative Example 14 50 g of the same mud as in Example 4 was taken in a polybeaker having a capacity of 500 ml, and only kneading using a spatula was performed without adding coconut dust and orthophosphoric acid, followed by elution in the same manner as in Example 4. The test showed that the amount of lead eluted was 0.81 mg.
Per liter, and the elution amount of cadmium is 0.10 mg / liter.
Liters. Table 2 shows the results of Examples 4 to 6 and Comparative Examples 8 to 14.
【００１０】[0010]
【表２】 [Table 2]
【００１１】泥土に椰子屑及び正リン酸を加えて混練し
た実施例４〜６においては、溶出試験における鉛及びカ
ドミウムの溶出量が少なく、特に泥土１００重量部に対
して椰子屑３重量部と正リン酸２重量部を加えた実施例
５及び椰子屑５重量部と正リン酸２重量部を加えた実施
例５では、鉛の溶出量及びカドミウムの溶出量がともに
０.０１mg／リットル以下となった。これに対して、椰
子屑のみを加えた比較例８〜１０及び正リン酸のみを加
えた比較例１１〜１３においては、椰子屑も正リン酸も
加えなかった比較例１４に比べると鉛及びカドミウムの
溶出量は少なくなっているが、椰子屑と正リン酸を加え
た実施例に比べると鉛及びカドミウムの溶出量が多く、
椰子屑と正リン酸を併用する本発明の処理方法が重金属
の固定化に優れた効果を有することが分かる。In Examples 4 to 6 in which coconut dust and orthophosphoric acid were added to the mud and kneaded, the amount of lead and cadmium dissolved in the dissolution test was small, and in particular, 3 parts by weight of coconut dust with respect to 100 parts by weight of mud. In Example 5 in which 2 parts by weight of orthophosphoric acid was added, and in Example 5 in which 5 parts by weight of coconut dust and 2 parts by weight of orthophosphoric acid were added, both the elution amount of lead and the elution amount of cadmium were 0.01 mg / liter or less. It became. In contrast, in Comparative Examples 8 to 10 in which only coconut dust was added and in Comparative Examples 11 to 13 in which only orthophosphoric acid was added, lead and lead were not added as compared to Comparative Example 14 in which neither coconut dust nor orthophosphoric acid was added. Although the elution amount of cadmium is small, the elution amount of lead and cadmium is large compared to the example in which coconut dust and orthophosphoric acid are added,
It can be seen that the treatment method of the present invention in which coconut dust and orthophosphoric acid are used in combination has an excellent effect on immobilizing heavy metals.
【００１２】[0012]
【発明の効果】本発明方法によれば、ヘドロ・スラッジ
類や掘削泥土中に存在する重金属が、そのまま有機性繊
維物質の表面及び繊維構造内部に吸着されて固定化され
るほかに、重金属が水難溶性のリン酸塩となって有機性
繊維物質の表面及び繊維構造内部に吸着されて固定化さ
れるので、重金属を含有するヘドロ・スラッジ類や掘削
泥土を容易かつ効率的に、しかも安全に処理して、処理
土からの重金属の溶出を確実に防止することができる。According to the method of the present invention, heavy metals present in sludge and sludge or excavated mud are adsorbed and fixed on the surface of the organic fiber material and the inside of the fiber structure as they are, and the heavy metals are removed. Since it becomes a poorly water-soluble phosphate and is adsorbed and fixed on the surface of the organic fiber material and inside the fiber structure, sludge and sludge containing heavy metals and excavated mud can be easily, efficiently, and safely. By performing the treatment, the elution of the heavy metal from the treated soil can be reliably prevented.
Claims (1)
繊維物質とリン酸又はその塩を加えて混練し、汚泥又は
泥土中の重金属を固定化することを特徴とする重金属を
含有する汚泥又は泥土の処理方法。A sludge or sludge containing a heavy metal, comprising adding an organic fiber substance and phosphoric acid or a salt thereof to a sludge or a sludge containing a heavy metal and kneading the mixture to fix the heavy metal in the sludge or the sludge. Or a method of treating mud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35625496A JP3635833B2 (en) | 1996-12-25 | 1996-12-25 | Method for treating sludge or mud containing heavy metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35625496A JP3635833B2 (en) | 1996-12-25 | 1996-12-25 | Method for treating sludge or mud containing heavy metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10180300A true JPH10180300A (en) | 1998-07-07 |
| JP3635833B2 JP3635833B2 (en) | 2005-04-06 |
Family
ID=18448120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35625496A Expired - Fee Related JP3635833B2 (en) | 1996-12-25 | 1996-12-25 | Method for treating sludge or mud containing heavy metals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3635833B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705880A (en) * | 2019-02-20 | 2019-05-03 | 胡芳 | A kind of chlor-alkali salt sludge recycling technology |
| JP2021038540A (en) * | 2019-09-02 | 2021-03-11 | 初雁興業株式会社 | Dredging system |
-
1996
- 1996-12-25 JP JP35625496A patent/JP3635833B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705880A (en) * | 2019-02-20 | 2019-05-03 | 胡芳 | A kind of chlor-alkali salt sludge recycling technology |
| JP2021038540A (en) * | 2019-09-02 | 2021-03-11 | 初雁興業株式会社 | Dredging system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3635833B2 (en) | 2005-04-06 |
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