JP3253355B2 - Powdered activated carbon for water treatment and method for producing the same - Google Patents
Powdered activated carbon for water treatment and method for producing the sameInfo
- Publication number
- JP3253355B2 JP3253355B2 JP16624892A JP16624892A JP3253355B2 JP 3253355 B2 JP3253355 B2 JP 3253355B2 JP 16624892 A JP16624892 A JP 16624892A JP 16624892 A JP16624892 A JP 16624892A JP 3253355 B2 JP3253355 B2 JP 3253355B2
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- powdered activated
- water
- water treatment
- powdered
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は水処理用粉末活性炭及び
その製造方法に関し、より詳細には水中で沈降しにくい
性質を有する水処理用粉末活性炭及びその製造方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powdered activated carbon for water treatment and a method for producing the same, and more particularly to a powdered activated carbon for water treatment having a property of hardly settling in water and a method for producing the same.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】水処理
用に用いられる粉末活性炭は賦活品を粉砕し、これをそ
のままあるいは水で湿潤化して使用されてきた。粉末活
性炭は添加される槽で分散するが、時間が経過すると沈
降する。そのためポンプで移送する際に槽の底部に沈降
して支障をきたしていた。2. Description of the Related Art Powdered activated carbon used for water treatment has been used by pulverizing an activated product, and then crushing the activated product or wetting it with water. The powdered activated carbon disperses in the tank where it is added, but settles out over time. For this reason, when transported by a pump, it settles at the bottom of the tank, causing a problem.
【０００３】そこで従来より、分散性を大きくする方
法、あるいは沈降速度を小さくする方法等が実施または
検討されている。分散性を大きくする方法としては、界
面活性剤を添加する方法が挙げられるが、この方法にお
いては、活性炭の吸着力低下を引き起こしたり、界面活
性剤の有害性のために実施することは困難であった。Therefore, conventionally, a method of increasing the dispersibility, a method of reducing the sedimentation speed, and the like have been implemented or studied. As a method of increasing the dispersibility, a method of adding a surfactant may be mentioned, but in this method, it is difficult to reduce the adsorptive power of activated carbon or to perform the method due to the harmfulness of the surfactant. there were.
【０００４】活性炭の水中における沈降速度は粒子径、
粒子密度及び粒子の表面電荷によって決定されることが
知られている。活性炭を微粉砕して沈降速度を小さくす
る方法においては、活性炭が希薄濃度で使用される場合
には、微粉末にすることで沈降速度を小さくすることが
できるが、高濃度で使用される場合には、水中で凝集し
て二次粒子を形成するため沈降速度を小さくできなかっ
た。The sedimentation velocity of activated carbon in water depends on the particle size,
It is known to be determined by the particle density and the surface charge of the particles. In the method of pulverizing the activated carbon to reduce the sedimentation velocity, when the activated carbon is used at a dilute concentration, the sedimentation velocity can be reduced by making it into a fine powder, but when the activated carbon is used at a high concentration On the other hand, the sedimentation velocity could not be reduced because of aggregation in water to form secondary particles.
【０００５】また、粒子の表面電荷を増大させて沈降速
度を小さくする方法は、活性炭を酸化してその酸性基量
を増加させ、表面電荷を負に帯電させることにより行わ
れる。これにより、水中の粒子の凝集を少なくし、二次
粒子の形成を少なくすることができる。しかし、市販さ
れている各種の粉末活性炭の酸性基量を調べてみると、
通常、１０ミリ等量／１００ｇ以上は得られておらず、
沈降速度を低下させるのには不十分であるというのが現
状である。Further, a method of increasing the surface charge of the particles to reduce the sedimentation velocity is carried out by oxidizing activated carbon to increase the amount of acidic groups and negatively charging the surface charge. Thereby, aggregation of particles in water can be reduced, and formation of secondary particles can be reduced. However, when examining the amount of acidic groups in various commercially available powdered activated carbons,
Usually, 10 milliequivalents / 100 g or more is not obtained,
At present, it is insufficient to reduce the sedimentation velocity.
【０００６】また、特開平４−５０１１０号公報には、
活性炭に含有されている全酸性基量が０．５ミリ等量／
ｇ以上である有機ハロゲン系溶剤回収用活性炭が開示さ
れている。これによると、ベーム等の研究に従い、粉末
活性炭１ｇに０．１ＮのＮａＯＨ溶液を加え、２４時振
とうした後０．１Ｎの塩酸で逆滴定する方法により、酸
性基量を測定しているが、本発明者らが同じ条件で市販
の粉末活性炭を測定することによって得られる酸性基量
は、やはり１０ミリ等量／１００ｇ以下であった。ま
た、活性炭の酸性基量が増加すると、親水性が増加する
ことにより疎水性物質の吸着力低下をきたすという問題
があった。[0006] Japanese Patent Application Laid-Open No. 4-50110 discloses that
The total amount of acidic groups contained in the activated carbon is 0.5 milliequivalent /
An activated carbon for recovering an organic halogen-based solvent having a weight of at least g is disclosed. According to this study, according to the study by Behm et al., The amount of acidic groups was measured by adding 0.1 N NaOH solution to 1 g of powdered activated carbon, shaking for 24 hours, and back titrating with 0.1 N hydrochloric acid. The amount of acidic groups obtained by measuring the commercially available powdered activated carbon by the present inventors under the same conditions was also 10 milliequivalents / 100 g or less. In addition, when the amount of acidic groups of the activated carbon increases, there is a problem that the hydrophilicity increases and the adsorptivity of hydrophobic substances decreases.
【０００７】[0007]
【課題を解決するための手段】本発明者は、粉末活性炭
の沈降性と表面構造との関係、さらには全酸性基量と疎
水物質の吸着力との関係について検討し、本発明の完成
に至った。本発明によれば、粒度が１５０μｍ以下の粉
末活性炭に含まれる全酸性基量が１５〜３０ミリ等量／
１００ｇであり、該粉末活性炭の沈降性が４０％以上
（ただし、沈降性は、水中に懸濁した活性炭を２４時間
放置した後、上から３／４の水中に含まれる活性炭を全
活性炭量に対する割合で表した値を示す）である水処理
用粉末活性炭が提供される。Means for Solving the Problems The present inventors have studied the relationship between the sedimentation property of powdered activated carbon and the surface structure, and the relationship between the total amount of acidic groups and the adsorptivity of hydrophobic substances, and completed the present invention. Reached. According to the present invention, the total amount of acidic groups contained in the powdered activated carbon having a particle size of 150 μm or less is 15 to 30 milliequivalents /
100 g, and the sedimentation property of the powdered activated carbon is 40% or more (however, the sedimentation property is determined by allowing the activated carbon suspended in water to stand for 24 hours and then reducing the activated carbon contained in 3/4 of the water from the top to the total activated carbon amount. Powdered activated carbon for water treatment is provided.
【０００８】また、全酸性基量が１０ミリ等量／１００
ｇ以下の粉末活性炭を酸化性雰囲気下で室温〜５００℃
の温度で処理して、粒度が１５０μｍ以下の粉末活性炭
に含まれる全酸性基量が１５〜３０ミリ等量／１００ｇ
であり、該粉末活性炭の沈降性が４０％以上（ただし、
沈降性は、水中に懸濁した活性炭を２４時間放置した
後、上から３／４の水中に含まれる活性炭を全活性炭量
に対する割合で表した値を示す）である水処理用粉末活
性炭を得る水処理用粉末活性炭の製造方法が提供され
る。ここで全酸性基量とは、活性炭に希アルカリ溶液を
加えて長時間振とうした時消費されたアルカリの等量を
いう。この値はベーム等の研究（H. P. Boehm, Adv. Ct
al., 16, 179(1966)）によれば、炭素材料の表面に結合
しているカルボニル基、ラクトン基およびカルボキシル
基の量に画位当するとされている。その具体的な測定法
は次の通りである。The total amount of acidic groups is 10 milliequivalents / 100
g or less of powdered activated carbon in an oxidizing atmosphere at room temperature to 500 ° C.
And the total amount of acidic groups contained in the powdered activated carbon having a particle size of 150 μm or less is 15 to 30 milliequivalents / 100 g
And the sedimentation of the powdered activated carbon is 40% or more (however,
The sedimentation property is as follows: activated carbon suspended in water is allowed to stand for 24 hours, and the activated carbon contained in 3/4 of the water from the top is expressed as a ratio to the total amount of activated carbon. A method for producing powdered activated carbon for water treatment is provided. Here, the total amount of acidic groups refers to an equivalent amount of alkali consumed when a diluted alkali solution is added to activated carbon and shaken for a long time. This value is based on studies by Boehm et al. (HP Boehm, Adv. Ct.
al., 16, 179 (1966)), it is determined that the amount of carbonyl, lactone, and carboxyl groups bound to the surface of the carbon material is equivalent. The specific measuring method is as follows.
【０００９】乾燥した粉末活性炭３．０００ｇを１００
ｍｌの三角フラスコに入れ、０．０３ＮのＮａＯＨ溶液
１００ｍｌを加えて振とう機にて２５℃で７日間振とう
する。その後Ｎ2 雰囲気下で０．４５μｍフィルターを
用いて濾過する。濾液５０ｍｌをビーカーに分取し、Ｎ
2 雰囲気下で０．１Ｎ塩酸溶液を用いてPH滴定する。ｐ
Ｈ７．０における塩酸滴定量（Ａｍｌ）を求める。一
方、５００℃以下の温度で活性炭を灰化し、その灰分を
１００ｍｌ三角フラスコに取り、０．０３ＮのＮａＯＨ
溶液１００ｍｌを加えて同様に振とう後、濾過し、０．
１Ｎ塩酸でｐＨ滴定する（Ｂｍｌ）。全酸性基量Ｃは、 Ｃ＝(B-A)×0.1×f×100/50×100/3 で表される。ここで、Ｃは全酸性基量（mEq.／１００
ｇ) 、ｆは０．１Ｎ塩酸のファクターを示す。3.000 g of dried powdered activated carbon was added to 100
Put in a ml Erlenmeyer flask, add 100 ml of 0.03N NaOH solution and shake with a shaker at 25 ° C. for 7 days. Thereafter, the mixture is filtered using a 0.45 μm filter under an N 2 atmosphere. Dispense 50 ml of the filtrate into a beaker,
PH titration with 0.1N hydrochloric acid solution under 2 atmospheres. p
The hydrochloric acid titer (Aml) at H7.0 is determined. On the other hand, the activated carbon was ashed at a temperature of 500 ° C. or less, and the ash was placed in a 100 ml Erlenmeyer flask, and 0.03 N NaOH was added.
After adding 100 ml of the solution and shaking in the same manner, the mixture was filtered, and the mixture was filtered.
The pH is titrated with 1N hydrochloric acid (Bml). The total amount of acidic groups C is represented by C = (BA) × 0.1 × f × 100/50 × 100/3. Here, C is the total amount of acidic groups (mEq./100
g) and f indicate a factor of 0.1N hydrochloric acid.
【００１０】また、沈降性とは活性炭を水中に懸濁さ
せ、一定時間静置させた後、液面から一定量のスラリー
を採取して濾過する。そして、その量をスラリー中の活
性炭量の当初に懸濁させた活性量に対する％で表示す
る。具体的には次のようにして測定する。乾燥した活性
炭０．５００ｇを２００ｍｌ栓つきメスシリンダーに入
れ、蒸留水で２００ｍｌとし、２５℃の恒温槽内で２４
時間静置する。その後、サイホンを用い、１５０ｍｌ位
置からスラリー１５０ｍｌを採取し、予め１１５℃で恒
量になるまで乾燥して秤量した０．４５μｍフィルター
（Ａｇ）で濾過する。濾過したフィルターを１１５℃で
恒量になるまで乾燥し秤量する（Ｂｇ）。沈降性Ｄは、 Ｄ＝(B-A)×200/150/0.5×100 で表される。ここで、Ｄは沈降性（％）を示し、Ｄが大
きければ浮遊性が良好となる。浄水プロセスにおいて
は、Ｄは実用上４０％以上が必要とされている。[0010] The term "precipitation" means that activated carbon is suspended in water and allowed to stand for a certain period of time, after which a certain amount of slurry is collected from the liquid surface and filtered. Then, the amount is indicated as a percentage of the amount of activated carbon in the slurry relative to the amount of activated carbon initially suspended. Specifically, the measurement is performed as follows. 0.500 g of dried activated carbon is put into a 200-ml graduated cylinder with a stopper, made up to 200 ml with distilled water, and placed in a thermostat at 25 ° C. for 24 hours.
Let stand for a while. Thereafter, using a siphon, 150 ml of the slurry is collected from the 150 ml position, dried at 115 ° C. until a constant weight is obtained, and filtered through a weighed 0.45 μm filter (Ag). The filtered filter is dried at 115 ° C. until constant weight and weighed (Bg). The sedimentability D is represented by D = (BA) × 200/150 / 0.5 × 100. Here, D indicates the sedimentation property (%), and the larger the D, the better the floating property. In the water purification process, D is required to be 40% or more in practical use.
【００１１】本発明における水処理用粉末活性炭は、活
性炭に含まれる全酸性基量が１５〜３０ミリ等量／１０
０ｇであり、好ましくは２０〜３０ミリ等量／１００ｇ
である。全酸性基量が増加するとそれに伴って、ヨード
吸着力が減少するので、活性炭のヨード吸着力が規格を
満たす範囲で増加させることが望ましい。また、これら
の活性炭のヨード吸着力は１０５０ｍｇ／ｇ（JIS K-19
91-1474)以上であることが好ましい。例えば、浄水場で
使用される活性炭にはヨード吸着力９００ｍｇ／ｇある
いは１０００ｍｇ／ｇの規格がある。The activated carbon powder for water treatment in the present invention has a total amount of acidic groups contained in the activated carbon of 15 to 30 milliequivalents / 10.
0 g, preferably 20-30 milliequivalents / 100 g
It is. As the total acidic group content increases, the iodine adsorbing power decreases accordingly. Therefore, it is desirable to increase the iodine adsorbing power of the activated carbon within a range that satisfies the standard. The iodine adsorption of these activated carbons is 1050 mg / g (JIS K-19
91-1474) or more. For example, activated carbon used in water purification plants has a standard of iodine adsorption power of 900 mg / g or 1000 mg / g.
【００１２】本発明の水処理用粉末活性炭の製造に使用
される活性炭は、全酸性基量が１０ミリ等量／１００ｇ
程度以下の粉末活性炭であれば、その種類は特に限定さ
れない。通常の賦活品では全酸性基量が１０ミリ等量／
１００ｇ程度以下であり、沈降性をよくするには全酸性
基量を増加させる必要がある。活性炭としては、例え
ば、おが屑、ヤシ殻等の天然植物、石炭、石油などから
得られる芳香性多環縮合物、フェノール樹脂等の合成樹
脂を、例えば、約４００〜６００℃で炭化し、常法、例
えば約８００〜１１００℃、水蒸気賦活等によって賦活
して得られた活性炭、石炭及び石油からのピッチ、フェ
ノール系、アクリル系、芳香族ポリアミド系並びにセル
ロース系等の繊維を炭化し、常法によって、賦活して得
られた活性炭素繊維等を粉砕した活性炭等が挙げられ
る。この場合の活性炭の粒度としては１５０μｍ程度以
下が好ましい。The activated carbon used for producing the powdered activated carbon for water treatment of the present invention has a total acidic group content of 10 milliequivalents / 100 g.
The type is not particularly limited as long as the powdered activated carbon is less than or equal to about. In a normal activation product, the total amount of acidic groups is 10 milliequivalents /
It is about 100 g or less, and it is necessary to increase the total amount of acidic groups to improve sedimentation. As the activated carbon, for example, natural resins such as sawdust, coconut shells, aromatic polycyclic condensates obtained from coal, petroleum, and the like, and synthetic resins such as phenolic resins are carbonized at about 400 to 600 ° C., for example, by a conventional method. For example, about 800 to 1100 ° C., activated carbon obtained by activation by steam activation or the like, carbonized pitch, phenolic, acrylic, aromatic polyamide-based and cellulose-based fibers from coal and petroleum, and obtained by a conventional method. And activated carbon obtained by pulverizing activated carbon fibers and the like obtained by activation. In this case, the particle size of the activated carbon is preferably about 150 μm or less.
【００１３】本発明の水処理用粉末活性炭の製造方法に
おいて、活性炭を酸化性雰囲気下で室温〜５００℃の温
度で処理する。この場合の酸化性雰囲気とは、空気又
は、酸素あるいはオゾンを含有する雰囲気中である。空
気中では、例えば、２００〜２５０℃程度の温度で、５
〜６０分間程度処理することが好ましく、１０％の酸素
ガスを含有した空気中では２５０〜３３０℃程度の温度
で、５〜６０分間程度処理することが好ましい。２００
℃以下では、炭素材料の反応性が低いため十分酸化でき
ないことがあるが、湿潤化した活性炭を水蒸気混合した
酸素含有ガスで酸化する場合には１００℃以下でも可能
である。５００℃以上の温度では活性炭が燃焼し好まし
くない。In the method for producing powdered activated carbon for water treatment according to the present invention, the activated carbon is treated at a temperature of room temperature to 500 ° C. in an oxidizing atmosphere. The oxidizing atmosphere in this case is an atmosphere containing air or oxygen or ozone. In air, for example, at a temperature of about 200 to 250 ° C., 5
The treatment is preferably carried out for about 60 to about 60 minutes, and more preferably for about 5 to 60 minutes at a temperature of about 250 to 330 ° C. in air containing 10% oxygen gas. 200
If the temperature is lower than 0 ° C, the carbon material may not be sufficiently oxidized due to low reactivity. However, if the wet activated carbon is oxidized with an oxygen-containing gas mixed with steam, the temperature may be lower than 100 ° C. If the temperature is higher than 500 ° C., the activated carbon is undesirably burned.
【００１４】上記のような酸化性雰囲気下で処理するこ
とにより、酸化剤として硝酸、過酸化水素、塩素、硫酸
などの水溶液に活性炭を浸漬した後中和、洗浄して乾燥
する湿式酸化法を用いる場合と比較して、酸化工程が簡
略化することができ、かつ後処理の必要がなく、安価に
かつ工業的に有利に目的とする水処理用粉末活性炭を得
ることができる。By performing the treatment in an oxidizing atmosphere as described above, a wet oxidation method in which activated carbon is immersed in an aqueous solution of nitric acid, hydrogen peroxide, chlorine, sulfuric acid, or the like as an oxidizing agent, neutralized, washed, and dried. Compared with the case where it is used, the oxidation step can be simplified, no post-treatment is required, and the desired powdered activated carbon for water treatment can be obtained inexpensively and industrially advantageously.
【００１５】そして、上記の方法により全酸性基量を増
加させることにより、全酸性基量が１５〜３０ミリ等量
／１００ｇである、吸着力を減少させることなく、沈降
速度の小さい水処理用粉末活性炭が得られる。By increasing the total amount of acidic groups by the above-described method, the total amount of acidic groups is 15 to 30 milliequivalents / 100 g. Powdered activated carbon is obtained.
【００１６】[0016]
【実施例】以下実施例によって本発明を具体的に説明す
るが、本発明はこれによって何等限定されるものではな
い。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.
【００１７】実施例１ 市販の全酸性基量が８．８ミリ等量／１００ｇの水蒸気
賦活粉末活性炭２０ｇを乾燥し、石英管に入れる。大気
２００ｍｌ／分を通じながら１０分で２５０℃に昇温
し、２５０℃で１５分間保持した後冷却して取り出す。Example 1 20 g of a commercially available steam activated powder of activated carbon having a total acidic group content of 8.8 meq / 100 g is dried and placed in a quartz tube. The temperature was raised to 250 ° C. in 10 minutes while passing through the atmosphere at 200 ml / min, kept at 250 ° C. for 15 minutes, cooled, and taken out.
【００１８】実施例２ 市販の全酸性基量が９．６ミリ等量／１００ｇの水蒸気
賦活粉末活性炭２０ｇをポリ袋に入れ、蒸留水２０ｍｌ
加え、よく混合する。５０℃の恒温槽に入れ５日間保持
した後取り出し、１１５℃で乾燥する。Example 2 20 g of a commercially available steam activated powder activated carbon having a total acidic group content of 9.6 milliequivalents / 100 g was placed in a plastic bag, and 20 ml of distilled water was used.
Add and mix well. It is put in a thermostat at 50 ° C., kept for 5 days, taken out, and dried at 115 ° C.
【００１９】実施例３ 市販の全酸性基量が８．０ミリ等量／１００ｇの水蒸気
賦活粉末活性炭２０ｇを乾燥し、石英管に入れる。窒素
で希釈した空気（Ｏ2 濃度１０．５ｖｏｌ．％）２００
ｍｌ／分を通じながら１０分間で３００℃に昇温し、３
００℃で１５分間保持した後、冷却して取り出す。Example 3 20 g of a commercially available steam activated powder activated carbon having a total acidic group content of 8.0 milliequivalents / 100 g is dried and placed in a quartz tube. Air diluted with nitrogen (O 2 concentration 10.5 vol.%) 200
The temperature was raised to 300 ° C. in 10 minutes while passing
After holding at 00 ° C. for 15 minutes, it is cooled and taken out.
【００２０】比較例１ 市販の全酸性基量が１１ミリ等量／１００ｇの水蒸気賦
活粉末活性炭２０ｇを用いた。上記の実施例１〜３及び
比較例で作製した活性炭の沈降性及び全酸性基量を測定
した。その結果を表１示す。Comparative Example 1 20 g of steam activated powder activated carbon having a total acidic group content of 11 milliequivalents / 100 g was used. The sedimentation properties and the total amount of acidic groups of the activated carbons produced in the above Examples 1 to 3 and Comparative Example were measured. Table 1 shows the results.
【００２１】[0021]
【表１】 表１の結果から、実施例１及び２のものは沈降性が８０
％及び８２％であり、沈降速度が極めて小さいことが明
らかとなった。また、実施例３のものは、沈降性が４２
％であるが、浄水プロセスにおいて、実用に供し得る限
界である４０％を越えており、十分に実用に供し得るも
のである。これに対して、比較例のものは、９％であ
り、実用には供し得るものではないことがわかった。[Table 1] From the results shown in Table 1, those of Examples 1 and 2 have a sedimentation property of 80.
% And 82%, which revealed that the sedimentation velocity was extremely low. In Example 3, the sedimentability was 42%.
%, Which exceeds the practically usable limit of 40% in the water purification process, and is sufficiently practical. On the other hand, the ratio in the comparative example was 9%, which was not practically applicable.
【００２２】[0022]
【発明の効果】本発明の水処理用粉末活性炭及びその製
造方法によれば、吸着力の低下がなく、さらに沈降速度
の小さな水処理用粉末活性炭を得ることができ、活性炭
添加槽で毎回全量の活性炭を有効に移送することができ
る。According to the powdered activated carbon for water treatment of the present invention and the method for producing the same, it is possible to obtain the powdered activated carbon for water treatment without lowering the adsorptive power and having a lower sedimentation rate. Activated carbon can be effectively transferred.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−50110（ＪＰ，Ａ) 特開 平４−346814（ＪＰ，Ａ) 特開 昭52−56754（ＪＰ，Ａ) 特開 昭61−250611（ＪＰ，Ａ) 特開 昭56−73542（ＪＰ，Ａ) 特公 昭53−38275（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B01J 20/20 C01B 31/08 C02F 1/28 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-50110 (JP, A) JP-A-4-346814 (JP, A) JP-A-52-56754 (JP, A) JP-A-61-1986 250611 (JP, A) JP-A-56-73542 (JP, A) JP-B-53-38275 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) B01J 20/20 C01B 31 / 08 C02F 1/28
Claims (2)
まれる全酸性基量が１５〜３０ミリ等量／１００ｇであ
り、該粉末活性炭の沈降性が４０％以上（ただし、沈降
性は、水中に懸濁した活性炭を２４時間放置した後、上
から３／４の水中に含まれる活性炭を全活性炭量に対す
る割合で表した値を示す）であることを特徴とする水処
理用粉末活性炭。1. A powdered activated carbon having a particle size of 150 μm or less has a total acidic group content of 15 to 30 milliequivalents / 100 g, and the sedimentation property of the powdered activated carbon is 40% or more (however, the sedimentation property is Powder activated carbon for water treatment, wherein the activated carbon suspended in the water is left for 24 hours, and the activated carbon contained in 3/4 of the water from the top is represented by the ratio to the total amount of activated carbon.)
下の粉末活性炭を酸化性雰囲気下で室温〜５００℃の温
度で処理して、粒度が１５０μｍ以下の粉末活性炭に含
まれる全酸性基量が１５〜３０ミリ等量／１００ｇであ
り、該粉末活性炭の沈降性が４０％以上（ただし、沈降
性は、水中に懸濁した活性炭を２４時間放置した後、上
から３／４の水中に含まれる活性炭を全活性炭量に対す
る割合で表した値を示す）である水処理用粉末活性炭を
得ることを特徴とする水処理用粉末活性炭の製造方法。2. A method for treating a powdered activated carbon having a total acidic group content of 10 milliequivalents / 100 g or less in an oxidizing atmosphere at a temperature of room temperature to 500 ° C. to obtain a total acidic group contained in the powdered activated carbon having a particle size of 150 μm or less. The amount is 15 to 30 milliequivalents / 100 g, and the sedimentation of the powdered activated carbon is 40% or more (however, the sedimentation is determined by leaving the activated carbon suspended in water for 24 hours, A powdered activated carbon for water treatment, wherein the activated carbon contained in the powder is expressed as a ratio to the total amount of activated carbon).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16624892A JP3253355B2 (en) | 1992-06-24 | 1992-06-24 | Powdered activated carbon for water treatment and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16624892A JP3253355B2 (en) | 1992-06-24 | 1992-06-24 | Powdered activated carbon for water treatment and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06367A JPH06367A (en) | 1994-01-11 |
| JP3253355B2 true JP3253355B2 (en) | 2002-02-04 |
Family
ID=15827865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16624892A Expired - Fee Related JP3253355B2 (en) | 1992-06-24 | 1992-06-24 | Powdered activated carbon for water treatment and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3253355B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10004054A1 (en) * | 2000-02-01 | 2001-08-23 | Judo Wasseraufbereitung | Preventing precipitation of calcium and magnesium salts in water by treatment with activated carbon which has been surface-modified with functional groups stabilizing the water hardness |
| JP4517700B2 (en) * | 2004-03-30 | 2010-08-04 | 東レ株式会社 | Water purifier |
-
1992
- 1992-06-24 JP JP16624892A patent/JP3253355B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06367A (en) | 1994-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Removal of copper from aqueous solution by carbon nanotube/calcium alginate composites | |
| DE69736214T2 (en) | mercury adsorbent | |
| Li et al. | Removal of Cu2+ ions from aqueous solutions by carbon nanotubes | |
| JP2000500113A (en) | Method for producing hollow silica particles | |
| CN104941584B (en) | Heavy metal ion SiO in a kind of adsorbed water body2/ C composite and its application | |
| DE2451019A1 (en) | METHOD OF MANUFACTURING ACTIVATED CARBON BALLS | |
| JP2007296463A (en) | Hydroxyapatite silica composite porous adsorbent and its manufacturing method | |
| WO2018047010A1 (en) | Biochar-based material and method of its preparation | |
| CN114753186B (en) | Paper deacidification composite material with high-stability suspension dispersion in fluorocarbon medium and preparation method and application thereof | |
| JP5744940B2 (en) | Method for treating radioactive Cs-contaminated water, radioactive Cs adsorbent and method for producing the same | |
| JP3253355B2 (en) | Powdered activated carbon for water treatment and method for producing the same | |
| CN107583620B (en) | Chitosan-based metal ion adsorbent and preparation method thereof | |
| Anbia et al. | The examination of surface chemistry and porosity of carbon nanostructured adsorbents for 1-naphthol removal from petrochemical wastewater streams | |
| JP4115150B2 (en) | Production method of molecular sieve activated carbon | |
| CN114177892A (en) | Carbon nano tube composite adsorbent and preparation method thereof | |
| WO2018210410A1 (en) | Removal of silanols from water | |
| Rungrodnimitchai et al. | The functionalization of activated carbon by oxidation | |
| US3944687A (en) | Method of preparing purifying agents consisting of activated siliceous porous mineral substances | |
| EP0037321A1 (en) | Process for making adsorbent materials for analyzing or treating liquids and materials so obtained | |
| CN115916698A (en) | Activated carbon and method for producing same | |
| JPS60132644A (en) | Adsorbent and its preparation | |
| JPH06106161A (en) | Activated carbon water purifier | |
| JP2901212B2 (en) | Activated carbon for removing organic halogen compounds | |
| Liu et al. | Preparing high-loaded potassium cobalt hexacyanoferrate/silica composite for radioactive wastewater treatment | |
| JP3376431B2 (en) | Method for producing activated carbon from waste tires |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20011023 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |