JPH0462241A - Method of corrosion-proof for sewerage facilities - Google Patents
Method of corrosion-proof for sewerage facilitiesInfo
- Publication number
- JPH0462241A JPH0462241A JP17015290A JP17015290A JPH0462241A JP H0462241 A JPH0462241 A JP H0462241A JP 17015290 A JP17015290 A JP 17015290A JP 17015290 A JP17015290 A JP 17015290A JP H0462241 A JPH0462241 A JP H0462241A
- Authority
- JP
- Japan
- Prior art keywords
- sewage pipe
- sewage
- sulfuric acid
- corrosion
- water
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000010865 sewage Substances 0.000 claims abstract description 30
- 239000003518 caustics Substances 0.000 claims abstract description 7
- 238000005536 corrosion prevention Methods 0.000 claims description 15
- 238000005273 aeration Methods 0.000 claims description 14
- 230000003628 erosive effect Effects 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000010800 human waste Substances 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 28
- 239000004567 concrete Substances 0.000 abstract description 13
- 238000005260 corrosion Methods 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 9
- 239000004568 cement Substances 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract description 3
- 238000007865 diluting Methods 0.000 abstract description 2
- 241000894006 Bacteria Species 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000004709 Chlorinated polyethylene Substances 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
Landscapes
- Sewage (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、下水道施設の防食方法に関し、特に、貯留さ
れる汚水から発生する侵蝕性物質により、下水管路、汚
泥槽、し尿槽、曝気槽等の下水道施設が化学作用を受け
て侵食されること防止する下水道施設の防食方法に関す
る。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a corrosion prevention method for sewage facilities, and in particular, the present invention relates to a corrosion prevention method for sewage facilities. This invention relates to a corrosion prevention method for sewage facilities, which prevents sewage facilities such as tanks from being eroded by chemical action.
〈従来の技術〉
下水管路、汚泥槽、し尿槽、曝気槽等の下水道施設、特
に鉄筋コンクリートにより建造されるこれらの下水道施
設は、貯留する一般家庭排水や工場用排水などの汚水中
に含まれる、種々の侵食性物質により化学作用を受けて
侵食される。この侵食作用の一例として、イオウ細菌に
よる侵食をあげることができる。これは、嫌気性細菌の
作用により汚水中の硫酸塩が分解されて硫化水素が生成
し、これが気中部に放散して気中部に存在する好気性イ
オウ細菌の作用により硫酸となって管路や槽の表面に凝
縮した水分に吸収され、この硫酸がコンクリート中のセ
メントと反応してこれらの下水道施設を侵食する。<Conventional technology> Sewerage facilities such as sewage pipes, sludge tanks, human waste tanks, aeration tanks, etc., especially these sewerage facilities constructed of reinforced concrete, contain wastewater contained in stored general household wastewater, industrial wastewater, etc. , is eroded by the chemical action of various erosive substances. An example of this erosive action is sulfur bacteria. This is because sulfate in wastewater is decomposed by the action of anaerobic bacteria and hydrogen sulfide is produced, which is diffused into the air and becomes sulfuric acid by the action of aerobic sulfur bacteria present in the air, causing damage to pipes and pipes. Absorbed by water condensing on the surface of the tank, this sulfuric acid reacts with the cement in the concrete and erodes these sewer facilities.
このような下水道施設の侵食を防止するための方法とし
て、コンクリートの表面に、エポキシやポリエステル等
の樹脂によってコーティングを施す防食方法が一般的に
知られている。As a method for preventing such erosion of sewage facilities, a corrosion prevention method in which the surface of concrete is coated with a resin such as epoxy or polyester is generally known.
〈発明が解決しようとする課題〉
しかしながら、かかる従来のコーティングを施す防食方
法では、その耐久性に限界があり、例えば、１０年程度
でその防食効果がなくなるので、その後は、コンクリー
トが腐食するにまかせざるをえず、また、再度コーティ
ングを施すとしても、コーティングを施すべき施設の洗
浄に手間がかがるとともに、洗浄及び再コーテイングの
作業中は、これらの施設を使用することができなくなる
という課題があった。<Problems to be Solved by the Invention> However, with such conventional corrosion prevention methods that apply coatings, there is a limit to their durability. Moreover, even if re-coating is to be applied, it will take time to clean the facilities where the coating should be applied, and these facilities will be unable to be used during the cleaning and re-coating work. There was an issue.
そこで、本発明は、上記課題を解消すべくなされたもの
で、コーティングを施す必要がなく、シたがってコーテ
ィングの耐久性に左右されずに恒久的に防食効果を保持
できるので、下水道施設の維持管理が容易であるととも
に、施設の使用が中断されることのない、下水道施設の
防食方法を提供することを目的とする。Therefore, the present invention has been made to solve the above problems, and since there is no need to apply a coating and the anticorrosive effect can be maintained permanently without being affected by the durability of the coating, it is possible to maintain the sewage facility. The purpose of the present invention is to provide a corrosion prevention method for sewage facilities that is easy to manage and does not interrupt the use of the facility.
〈課題を解決するための手段〉
本発明は、上記目的に鑑みてなされたものであり、その
要旨は、貯留する汚水から気中部に放散される硫化水素
やこれから生成する硫酸等の侵食性物質によって、下水
管路、汚泥槽、し原種、曝気槽等の下水道施設の、気中
部表面が侵食されることを防ぐ防食方法であって、前記
下水道施設の気中部表面に、継続的あるいは間欠的に散
水して洗浄し、該洗浄箇所に発生又は付着した侵食性物
質を除去あるいは希釈することによって施設の侵食を防
止する下水道施設の防食方法にある。<Means for Solving the Problems> The present invention has been made in view of the above-mentioned objects, and its gist is to eliminate corrosive substances such as hydrogen sulfide released into the air from accumulated wastewater and sulfuric acid generated from this. This is a corrosion prevention method for preventing erosion of the surface of the aerial part of sewage facilities such as sewage pipes, sludge tanks, raw materials, aeration tanks, etc. The present invention provides a corrosion prevention method for a sewage facility, which prevents corrosion of the facility by spraying water on the area to clean it and removing or diluting erosive substances generated or attached to the cleaning area.
ここで散水に用いる洗浄水は、水道水の他、雨水や下水
の処理水等を用いてもよい。The cleaning water used for watering here may be tap water, rainwater, treated sewage water, or the like.
〈作用〉
本発明では、下水管路、汚泥槽、し原種、曝気槽等の下
水道施設の、気中部表面に発生又は付着した侵食性物質
を、散水することによって除去し、あるいは希釈して侵
食性物質が施設を侵食しない程度の濃度にし、この散水
を常時あるいは間欠的に行なう。<Function> In the present invention, erosive substances generated or adhered to the surface of the aerial parts of sewage facilities such as sewage pipes, sludge tanks, seedlings, and aeration tanks are removed by sprinkling water or diluted to prevent erosion. Watering should be done constantly or intermittently to maintain a concentration of pollutants that will not corrode the facility.
〈実施例〉
次に、添付図面を参照し、本発明の実施例を詳細に説明
する。<Embodiments> Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
第１図では、本発明の防食方法に用いる散水器！１１．
１２が、コンクリート族の下水管１０に予め設けられた
アンカー等からなる支持部材１３を介して支持され、下
水管１０内の気中部１４における侵食性物質が付著しや
すい箇所の付近、すなわち下水管１０の上部と、天側部
付近に配置されている。本実施例は、第２図に示すよう
に、コンクリート族の下水管１０において、気中部１４
に放散された硫化水素がイオウ細菌の作用によりさらに
硫酸に変化して、これがコンクリート族の下水管１０を
侵食する場合の防食方法を示すもので、Ａ及びＢで示す
結露の多い領域あるいは乾湿がくり返され、侵食性物質
が濃縮される領域が特に侵食されやすいということが知
られている。したがって、これらの領域への散水を集中
して行なうことができるように、前述のように散水装置
１１が下水管１０の上部における天井部付近の軸方向に
１本、下水管ｌＯの両側部である汚水貯留部１５と気中
部１４との境界部付近の軸方向にそれぞれ１本づつ配置
されている。散水装置１１゜１２は、洗浄水をポンプ等
によって輸送する供給管と、これに連通した散水用の多
数の孔を設けている散水器とによって構成され、これら
は通常の散水装置の技術によって製作されるものである
ゆまた。散水装置１１．１２の供給管は、上水、雨水あ
るいは下水の処理水等の洗浄水を配送する供給装置に連
通して、これらを給送する。Figure 1 shows a water sprinkler used in the corrosion prevention method of the present invention! 11.
12 is supported via a support member 13 consisting of an anchor or the like provided in advance on the concrete sewer pipe 10, and is placed near a location where corrosive substances are likely to accumulate in the air part 14 of the sewer pipe 10, that is, at the bottom. They are arranged at the top of the water pipe 10 and near the top side. In this embodiment, as shown in FIG. 2, in a concrete sewer pipe 10, an air section 14
This shows a method for preventing corrosion when the hydrogen sulfide released in the water is further changed into sulfuric acid by the action of sulfur bacteria, which corrodes the concrete sewer pipe 10. It is known that areas that are repeatedly attacked and where erosive substances are concentrated are particularly susceptible to erosion. Therefore, in order to be able to spray water in these areas in a concentrated manner, as mentioned above, one water sprinkler 11 is installed in the axial direction near the ceiling at the top of the sewer pipe 10, and one on both sides of the sewer pipe IO. One each is arranged in the axial direction near the boundary between a certain wastewater storage section 15 and the air section 14. The water sprinkling devices 11 and 12 are composed of a supply pipe for transporting washing water using a pump or the like, and a water sprinkler that is connected to the supply pipe and has a number of holes for water sprinkling, and these are manufactured using ordinary water sprinkling device technology. Yumata is something that will be done. The supply pipes of the sprinkler devices 11, 12 communicate with a supply device for distributing cleaning water, such as tap water, rainwater or treated sewage water.
なお、これら散水装置１１，１２や前記支持部材１３は
、ステンレス等の耐食性のよい材料で作成されているの
で、下水管１０内において容易に腐食しない。Note that these water sprinklers 11 and 12 and the support member 13 are made of a material with good corrosion resistance, such as stainless steel, so that they do not easily corrode inside the sewer pipe 10.
上記構成からなる散水装置１１．１２に給送された洗浄
水は、継続的に、あるいは間欠的に、下水管１０の気中
部１４に接する内表面に散水される。このようにして、
下水管１０の内表面に凝結した水分に溶は込んだ硫酸の
濃度が、所定のｐＨ値を超えて高くなる前に、この硫酸
を内表面から洗い流すか、又は希釈して、硫酸と、コン
クリート族の下水管１０中に存するセメントとの反応を
防ぎ、下水管１０を防食する。The cleaning water fed to the water sprinkler 11, 12 having the above configuration is continuously or intermittently sprinkled on the inner surface of the sewer pipe 10 that is in contact with the air section 14. In this way,
Before the concentration of sulfuric acid dissolved in water condensed on the inner surface of the sewer pipe 10 rises above a predetermined pH value, this sulfuric acid is washed away from the inner surface or diluted to remove the sulfuric acid and the concrete. This prevents reaction with cement existing in the sewer pipe 10 of the group, and protects the sewer pipe 10 from corrosion.
第３図〜第５図は、本発明による防食方法をコンクリー
ト族の曝気槽２０に用いた実施例を示すものである。曝
気槽２０では、曝気処理の前に汚水を中和するために硫
酸が用いられ、したがって処理水中に多量の硫酸塩が含
まれている。このため、スプラッシュゾーン２１上方の
表面２２に付着した水分に、イオウ細菌の作用によって
生成した硫酸が溶は込み、これによってコンクリートが
侵食される。ここでスプラッシュゾーン２１とは、曝気
によって生じる飛沫領域である。また、曝気槽２０には
、従来より、曝気によって発生する泡を消去する目的で
、スプラッシュゾーン２１の上方に、下水の処理水等を
散水する消泡装置２３が取付けられている。消泡装置２
３は、第４図に示すように、給水管２４と、放水口２５
と、放水口２５の先端にヒンジ２６を介して取付けられ
た重り２７とによって構成され、放水口２５の角度や重
り２７の重さを調節することによって、散水の方向と強
さを任意にセットすることができる。したがって、第５
図に示すように、消泡装置２３による散水の方向を、消
泡のために使用するときよりも上方にセットして、スプ
ラッシュゾーン上方のコンクリートの表面２２を洗浄で
きるようにすれば、本発明の防食方法に用いる散水装置
として転用することができる。この場合、例えば、約３
０分間隔で、約５分間、間欠的に、前記コンクリートの
表面２２の洗浄を行なうことが好ましい。3 to 5 show examples in which the corrosion prevention method according to the present invention is applied to an aeration tank 20 for concrete. In the aeration tank 20, sulfuric acid is used to neutralize the wastewater before aeration treatment, and therefore the treated water contains a large amount of sulfate. Therefore, sulfuric acid produced by the action of sulfur bacteria dissolves into the moisture adhering to the surface 22 above the splash zone 21, thereby corroding the concrete. Here, the splash zone 21 is a region of splashes generated by aeration. Furthermore, a defoaming device 23 is conventionally attached to the aeration tank 20 above the splash zone 21 for spraying treated sewage water or the like for the purpose of eliminating foam generated by aeration. Defoaming device 2
3 is a water supply pipe 24 and a water outlet 25 as shown in FIG.
and a weight 27 attached to the tip of the water outlet 25 via a hinge 26, and by adjusting the angle of the water outlet 25 and the weight of the weight 27, the direction and intensity of watering can be arbitrarily set. can do. Therefore, the fifth
As shown in the figure, if the direction of water sprinkling by the defoaming device 23 is set higher than when used for defoaming so that the concrete surface 22 above the splash zone can be cleaned, the present invention It can be used as a watering device for anti-corrosion methods. In this case, for example, about 3
Preferably, the concrete surface 22 is cleaned intermittently for approximately 5 minutes at 0 minute intervals.
なお、該表面に、超高分子ポリエチレン、クロルスルフ
ォン化ゴム、Ｅ Ｐ ＤＭ、塩素化ポリエチレン等のシ
ート２４を貼り付けておけば、防食効果をさらに高める
ことができる。Note that if a sheet 24 made of ultra-high molecular polyethylene, chlorosulfonated rubber, EPDM, chlorinated polyethylene, or the like is attached to the surface, the anticorrosion effect can be further enhanced.
また、本発明の防食方法は、各種材料から構築される施
設が、様々な侵食性物質によって侵食されることに対し
、これを防ぐために用いられる。Further, the corrosion prevention method of the present invention is used to prevent facilities constructed from various materials from being eroded by various corrosive substances.
すなわち、上述したような、コンクリート製の下水道施
設が、イオウ細菌の作用を受けて生成する硫酸により侵
食される場合に限って用いられるものではない。That is, it is not used only when concrete sewerage facilities as described above are attacked by sulfuric acid produced by the action of sulfur bacteria.
〈発明の効果〉
本発明の下水道施設の防食方法は、下水道施設の気中部
表面に散水し、該表面の侵蝕性物質を洗浄することによ
って防食するので、下水道施設の維持管理が容易である
とともに、その防食効果が恒久的であるので施設の寿命
が長くなり、かつ維持管理のための作業によって施設の
使用が中断されないという効果をもたらす。<Effects of the Invention> The corrosion prevention method for sewage facilities of the present invention prevents corrosion by spraying water on the surface of the aerial part of the sewage facility and washing corrosive substances on the surface, so that maintenance and management of the sewage facility is easy. Since the anti-corrosion effect is permanent, the lifespan of the facility is extended, and the use of the facility is not interrupted by maintenance work.
第１図は、本発明の防食方法を用いて下水管を防食する
状況を示す説明図、第２図は、イオウ細菌の作用により
生成する硫酸によって、下水管が侵食される状況を示す
説明図、第３図は、曝気槽と、曝気槽に取り付けられ消
泡装置とを示す概略図、第４図は、消泡装置の詳細図、
第５図は、本発明の防食方法を用いて曝気槽を防食する
状況を示す説明図である。
１０・・下水管、１１・・散水装置、１４・・気中部、
２０・・曝気槽、２３・・消泡装置。
第１図
第２図Figure 1 is an explanatory diagram showing a situation in which a sewer pipe is protected against corrosion using the corrosion prevention method of the present invention, and Figure 2 is an explanatory diagram showing a situation in which a sewer pipe is corroded by sulfuric acid produced by the action of sulfur bacteria. , FIG. 3 is a schematic diagram showing an aeration tank and a defoaming device attached to the aeration tank, and FIG. 4 is a detailed diagram of the defoaming device.
FIG. 5 is an explanatory diagram showing a situation in which an aeration tank is protected against corrosion using the corrosion protection method of the present invention. 10... Sewer pipe, 11... Water sprinkler, 14... Aerial part,
20...Aeration tank, 23...Defoaming device. Figure 1 Figure 2
Claims (1)
槽、し尿槽、曝気槽等の下水道施設における気中部の侵
食を防止する防食方法であって、前記下水道施設の気中
部に位置する表面に散水し、該表面の侵食性物質を洗浄
することを特徴とする下水道施設の防食方法。A corrosion prevention method for preventing erosion of the aerial parts of sewage facilities such as sewage pipes, sludge tanks, human waste tanks, aeration tanks, etc. due to erosive substances generated from sewage, the method comprising: A corrosion prevention method for sewage facilities, which comprises spraying water to wash away corrosive substances on the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17015290A JPH0462241A (en) | 1990-06-29 | 1990-06-29 | Method of corrosion-proof for sewerage facilities |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17015290A JPH0462241A (en) | 1990-06-29 | 1990-06-29 | Method of corrosion-proof for sewerage facilities |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0462241A true JPH0462241A (en) | 1992-02-27 |
Family
ID=15899647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17015290A Pending JPH0462241A (en) | 1990-06-29 | 1990-06-29 | Method of corrosion-proof for sewerage facilities |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0462241A (en) |
-
1990
- 1990-06-29 JP JP17015290A patent/JPH0462241A/en active Pending
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