JPS609593B2 - Cathodic protection method for floating activated carbon adsorption equipment - Google Patents
Cathodic protection method for floating activated carbon adsorption equipmentInfo
- Publication number
- JPS609593B2 JPS609593B2 JP53036731A JP3673178A JPS609593B2 JP S609593 B2 JPS609593 B2 JP S609593B2 JP 53036731 A JP53036731 A JP 53036731A JP 3673178 A JP3673178 A JP 3673178A JP S609593 B2 JPS609593 B2 JP S609593B2
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- anode
- adsorption device
- carbon adsorption
- cathodic protection
- 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
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 52
- 238000001179 sorption measurement Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 14
- 238000004210 cathodic protection Methods 0.000 title description 5
- 238000005260 corrosion Methods 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000008151 electrolyte solution Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000013535 sea water Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Treatment Of Liquids With Adsorbents In General (AREA)
- Prevention Of Electric Corrosion (AREA)
Description
【発明の詳細な説明】
本発明は、活性炭によって電解質溶液中の不純物を除去
する装置、たとえば各種廃水処理装置、上・下水処理装
置などに使用される金属製処理槽内面およびこれの付属
部材の腐食を防止する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner surface of a metal treatment tank used in devices for removing impurities in an electrolyte solution using activated carbon, such as various wastewater treatment devices, water treatment and sewage treatment devices, and its attached members. The present invention relates to a method for preventing corrosion of.
従来、吸着剤に活性炭を使用して液体中の不純物を除去
する方法としては、金属製処理槽に粉末あるいは粒状活
性炭を充填する、いわゆる固定層吸着法あるいは移動層
吸着法が一般に行なわれている。Conventionally, methods for removing impurities in liquids using activated carbon as an adsorbent have generally been carried out by filling a metal treatment tank with powdered or granular activated carbon, the so-called fixed bed adsorption method or moving bed adsorption method. .
これらの方法において、活性炭を吸着剤として使用する
ことは吸着装置のメンテナンスの面からみるとかならず
しも適当とはいえない。それは、活性炭の持っている電
気的性質（たとえば電気比抵抗が非常に小さく、電位が
鉄より貴である。）によって浄化される溶液がさらに腐
食性が増加することが知られているからである。したが
って、従来はこのような腐食性の強い液体から金属製処
理内面および付属部材を保護するために塗装あるいは樹
脂ラィニング等による防食処理が行なわれているが、塗
覆装の劣化が激しいために十分な防食効果を期待するこ
とができないのが現状である。In these methods, it is not always appropriate to use activated carbon as an adsorbent from the viewpoint of maintenance of the adsorption device. This is because it is known that the electrical properties of activated carbon (for example, its electrical resistivity is very low and its potential is nobler than that of iron) make the solution being purified even more corrosive. . Therefore, anti-corrosion treatment such as painting or resin lining has been conventionally carried out to protect the metal inner surfaces and attached parts from such highly corrosive liquids, but since the coating deteriorates rapidly, it is not enough. At present, it is not possible to expect a significant anti-corrosion effect.
また、本発明者らは他の防食方法として、上記活性炭が
充填された金属製処理槽内面に不溶性陽極棒を捜入して
電気防食を適用することを試みたが、好結果を得ること
はできなかつた。一方、近年、工業の大型化とともに製
品の要求水準が上るにしたがって、ＣＯＤ、８０Ｄの除
去あるいは脱色等を活性炭の吸着剤によって大量に処理
することが必要となった。このような吸着処理において
、ネックとなっているのは原液中に含まれる懸濁固型物
によって吸着層が閉塞されらるということである。In addition, as another corrosion prevention method, the present inventors attempted to apply cathodic protection by inserting an insoluble anode rod into the inner surface of the metal processing tank filled with the activated carbon, but they were unable to obtain good results. I couldn't. On the other hand, in recent years, as industries have become larger and the required standards of products have increased, it has become necessary to remove COD and 80D or decolorize them in large quantities using activated carbon adsorbents. The bottleneck in such adsorption treatment is that the adsorption layer is clogged by suspended solids contained in the raw solution.
本発明者らはかかる現状に鑑み、活性炭を使用する吸着
装置において防食と吸着の両面を同時に満足させるべく
鋭意研究の結果本発明に到達した。In view of the current situation, the present inventors have arrived at the present invention as a result of intensive research in order to simultaneously satisfy both corrosion prevention and adsorption in an adsorption device using activated carbon.
すなわち、本発明の要旨とするところは、活性炭を使用
して電解質溶液中の不純物を除去する吸着装置において
、前記溶液中に粒状活性炭を浮遊させると共に、活性炭
の粒子が通り抜けられない程度の電流流出孔を有する繊
維状の絶縁製保護材で被覆され、さらにその外側に電流
流出用の開□窓を有する合成樹脂製の保護パイプによっ
て囲まれた線状不溶性陽極を金属製処理槽内面に対向し
て設置し、前記陽極を正極とし、上記処理槽を負極とし
て通電することを特徴とする浮遊式活性炭吸着装置の電
気防食方法である。That is, the gist of the present invention is to provide an adsorption device that uses activated carbon to remove impurities in an electrolyte solution, in which granular activated carbon is suspended in the solution and a current flows out to an extent that the activated carbon particles cannot pass through. A linear insoluble anode, which is covered with a fibrous insulating protective material with holes and surrounded by a synthetic resin protective pipe with an opening for current flow on the outside, faces the inner surface of the metal processing tank. This is a method for cathodic protection of a floating activated carbon adsorption device, characterized in that the anode is installed as a positive electrode, and the treatment tank is used as a negative electrode and is energized.
つぎに、本発明の防食方法を実施例に基づいて説明する
。Next, the corrosion prevention method of the present invention will be explained based on examples.
第１図は、本発明方法が適応された活性炭吸着装置の断
面概略図であり、第２図は、そのＡ−Ａ断面図である。FIG. 1 is a schematic cross-sectional view of an activated carbon adsorption device to which the method of the present invention is applied, and FIG. 2 is a cross-sectional view taken along line A-A.
円筒状の鋼製処理槽１の内部は複数の格子状仕切り板２
によって多段に仕切られている。線状の不溶性陽極３が
各仕切り板２の格子目を貫通し、処理槽１の内面に対向
して設置されている。The interior of the cylindrical steel processing tank 1 has a plurality of grid-like partition plates 2.
It is divided into multiple stages by. A linear insoluble anode 3 passes through the grid of each partition plate 2 and is installed facing the inner surface of the processing tank 1.
この陽極３の鞍水部は活性炭粒子が通り抜けられない程
度の電流流出孔を有する絶縁性の保護材４、たとえばガ
ラス繊維チューブによって被覆され、さらにその外側は
電流流出用の関口窓５を有する合成樹脂製の保護パイプ
６で囲まれている。前記保護材４とパイプ６との空間部
には電極７が捜入され、適宜の位置で陽極３に電気的に
接続固定され、陽極の電圧降下を少なくしている。この
電線７は処理槽上部より外部に取り出され図示されてい
ない電気防食用直流電源装置の直流出力の正極側に接続
されし負極側は電線によって処理槽に接続されている。
未処理液（海水）は、処理槽下部の取り入れ口８から導
入され、上部取り出し口９よりオーバーフロウさせてい
る。The saddle part of the anode 3 is covered with an insulating protective material 4, such as a glass fiber tube, which has current outflow holes large enough to prevent activated carbon particles from passing through, and the outer side of the anode 3 is covered with a synthetic protective material 4 having a gate window 5 for current outflow. It is surrounded by a protective pipe 6 made of resin. An electrode 7 is inserted into the space between the protective material 4 and the pipe 6, and is electrically connected and fixed to the anode 3 at an appropriate position to reduce the voltage drop at the anode. This electric wire 7 is taken out from the upper part of the processing tank and connected to the positive electrode side of the DC output of a DC power supply for cathodic protection (not shown), and the negative electrode side is connected to the processing tank by an electric wire.
Untreated liquid (seawater) is introduced from the intake port 8 at the bottom of the treatment tank, and is allowed to overflow from the top outlet 9.
その流速は活性炭の粒子が処理槽上部より流れ出さない
程度、たとえば粒子の形状が６００〜７００〃での場合
で９ｍ／ｈぐらいであり、また活性炭は処理液に対する
密度が０．５夕／ｃｃぐらいになるように浮遊させられ
ている。一方「防食効果確認のために２０Ｃｘ５０肋の
無防食用テストピースと防食用テストピースが処理槽内
に２組設置されている。以上のような「海水処理槽にお
いて、下記の防食設計条件によって稼動された。The flow rate is such that the activated carbon particles do not flow out from the upper part of the processing tank, for example, about 9 m/h when the particle shape is 600 to 700 mm, and the density of the activated carbon relative to the processing liquid is 0.5 mm/cc. It is suspended in such a way that it becomes about. On the other hand, in order to confirm the anti-corrosion effect, two sets of 20C x 50 ribs non-corrosion test piece and anti-corrosion test piece are installed in the treatment tank. It was done.
陽 極−３０×１３，５００の白金メッキチタン線４本
。Anode - 4 platinum-plated titanium wires measuring 30 x 13,500.
陽極発生電流−１０Ａ／本
防食面積−６３０め、
防食電流密度−６仇ｈＡ／〆
５７日後に行なったテストピースの秤量と、これに基づ
く防食率の算出結果はつぎの表のとおりである。Anode generated current: -10A/Main corrosion protection area: -630m, Corrosion protection current density: -6mA/〆The following table shows the weighing of the test piece carried out after 57 days and the calculation results of the corrosion protection rate based on this.
この表から明らかなように、本発明における処理槽の侵
食度は一般に文献等で知られている鉄鋼（海水中）の平
均侵食度０．１２側／Ｙに比較して、約２．牙音もの大
きな値を示し、活性炭を使用する海水処理槽内が非常に
腐食性の強い環境であることが確認された。As is clear from this table, the erosion degree of the treatment tank in the present invention is about 2.2 mm compared to the average erosion degree of steel (in seawater) of 0.12/Y, which is generally known in the literature. The noise level was extremely high, confirming that the inside of a seawater treatment tank that uses activated carbon is a highly corrosive environment.
しかしながら、このような環境に対しても本発明の方法
を実施した場合は、防食電流密度が６仇ｈＡ／あと一般
の海水中の鉄鋼に対する電流密度（８０〜１０印ｈＡ／
の）よりきびしい設計条件にもかかわらず防食率が平均
９６．６％と非常に良好な結果が得られた。However, if the method of the present invention is carried out in such an environment, the corrosion protection current density will be 6 hA/hA/, and the current density for steel in general seawater (80-10 mA/hA/
Despite the more severe design conditions (2013), very good results were obtained with an average corrosion protection rate of 96.6%.
この理由は、本発明における浮遊環境が一般の海水中に
おける鋼の状態に比べて一種の停滞環境であるので陰分
極の進行に流速、酸素等の影響をあまり受けないことに
よるものと考えられる。以上、説明したように、本発明
の方法によれば、電解質溶液を処理する活性炭吸着装置
における処理槽内面の腐食に対し、電気防食の適応を可
能にすると共に、活性炭を浮遊させるようにしたので懸
濁固型物等による詰まり問題はなくなった。The reason for this is thought to be that the floating environment in the present invention is a kind of stagnant environment compared to the state of steel in general seawater, so the progress of cathode polarization is not affected much by flow rate, oxygen, etc. As explained above, according to the method of the present invention, it is possible to apply cathodic protection against corrosion of the inner surface of a treatment tank in an activated carbon adsorption device for treating an electrolyte solution, and also to suspend activated carbon. This eliminates the problem of clogging caused by suspended solids.
また、陽極が活性炭と接触することがないので防食電流
を最も効果的に供給することができるため、きわめて経
済的な防食をおこなうことができる。Furthermore, since the anode does not come into contact with the activated carbon, the anticorrosion current can be supplied most effectively, so that corrosion protection can be carried out extremely economically.
第１図は、本発明方法が適応された活性炭吸着装置の断
面概略図であり、第２図は、そのＡ−Ａ断面図である。
１・・・・・・鋼製処理槽、２・・・・・・仕切り板、
３・・・・・・不溶性陽極、４・・・・・・保護材、６
・・・・・・保護パイプ、８……取り入れ口、９・・・
・・・取り出し口。弟ノ図第２図FIG. 1 is a schematic cross-sectional view of an activated carbon adsorption device to which the method of the present invention is applied, and FIG. 2 is a cross-sectional view taken along line A-A. 1... Steel processing tank, 2... Partition plate,
3... Insoluble anode, 4... Protective material, 6
...Protection pipe, 8...Intake port, 9...
...Ejection port. Little brother drawing 2
Claims (1)
吸着装置において、前記溶液中に粒状活性炭を浮遊させ
ると共に、活性炭の粒子が通り抜けられない程度の電流
流出孔を有する繊維状の絶縁性保護材で被覆され、さら
にその外側に電流流出用の開口窓を有する合成樹脂製の
保護パイプによって囲まれた線状不溶性陽極を金属製処
理槽内面に対して設置し、前記陽極を正極とし、上記処
理槽を負極として通電することを特徴とした浮遊式活性
炭吸着装置の電気防食方法。1. In an adsorption device that uses activated carbon to remove impurities in an electrolyte solution, a fibrous insulating protective material that suspends granular activated carbon in the solution and has current flow holes large enough to prevent activated carbon particles from passing through. A linear insoluble anode surrounded by a protective pipe made of synthetic resin and having an opening window for current flow on the outside thereof is installed on the inner surface of the metal processing tank, and the anode is used as the positive electrode, and the above-mentioned A method for electrolytic corrosion protection of a floating activated carbon adsorption device, characterized by applying electricity to the treatment tank as a negative electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53036731A JPS609593B2 (en) | 1978-03-31 | 1978-03-31 | Cathodic protection method for floating activated carbon adsorption equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53036731A JPS609593B2 (en) | 1978-03-31 | 1978-03-31 | Cathodic protection method for floating activated carbon adsorption equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54128953A JPS54128953A (en) | 1979-10-05 |
| JPS609593B2 true JPS609593B2 (en) | 1985-03-11 |
Family
ID=12477869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53036731A Expired JPS609593B2 (en) | 1978-03-31 | 1978-03-31 | Cathodic protection method for floating activated carbon adsorption equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS609593B2 (en) |
-
1978
- 1978-03-31 JP JP53036731A patent/JPS609593B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54128953A (en) | 1979-10-05 |
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