JPH02180697A - Biological treatment utilizing waste heat in sewage or sludge treatment - Google Patents
Biological treatment utilizing waste heat in sewage or sludge treatmentInfo
- Publication number
- JPH02180697A JPH02180697A JP33464188A JP33464188A JPH02180697A JP H02180697 A JPH02180697 A JP H02180697A JP 33464188 A JP33464188 A JP 33464188A JP 33464188 A JP33464188 A JP 33464188A JP H02180697 A JPH02180697 A JP H02180697A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- heat
- treated water
- temperature
- aeration tank
- 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
- 239000010865 sewage Substances 0.000 title claims abstract description 19
- 239000002918 waste heat Substances 0.000 title claims abstract description 11
- 239000010802 sludge Substances 0.000 title claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000005273 aeration Methods 0.000 claims abstract description 24
- 230000029087 digestion Effects 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 7
- 238000004065 wastewater treatment Methods 0.000 claims description 4
- 239000003415 peat Substances 0.000 claims 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 abstract description 5
- 239000000460 chlorine Substances 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 5
- 239000013535 sea water Substances 0.000 abstract description 4
- 239000013505 freshwater Substances 0.000 abstract description 3
- 241000894006 Bacteria Species 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 244000005700 microbiome Species 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- 238000000855 fermentation Methods 0.000 description 4
- 230000004151 fermentation Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000010840 domestic wastewater Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、生活排水、し尿、下水などの汚水の処理プ
ラント、または同プラントを組込んだ台船において、放
流される処理水の廃熱を利用して、汚水ないし汚泥の生
物学的処理を行なう方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention utilizes the waste heat of treated water discharged in a treatment plant for sewage such as domestic wastewater, human waste, and sewage, or in a barge incorporating the same plant. The present invention relates to a method for biologically treating sewage or sludge.
従来技術およびその問題点
我国の下水道普及率は日増しに高まっているが、一方特
に都市部においては汚水処理場の用地確保がますます困
難になって来ている。この問題を解決する一方法として
、汚水処理を洋上で行なうことが考えられている。Prior art and its problems Although the penetration rate of sewerage systems in Japan is increasing day by day, it is becoming increasingly difficult to secure land for sewage treatment plants, especially in urban areas. One way to solve this problem is to treat wastewater offshore.
ところで、汚水の洋上処理においては、第４図に示すよ
うに、汚水処理プラントを組込んだ台船（５１）が用い
られる。この台船（５１）は、一端から他端に、分配？
！ （５２）と最初沈澱槽（５３）と曝気槽（５４）と
最終沈澱槽（５５）と塩素混和槽（５６）とに、仕切壁
によって区画されている。そして汚水は、陸上施設（５
７）から洋上の貯槽ブイ（５８）および船上のポンプ（
５９）を介して台船（５１）の分配Ｍ （５２）に送入
され、台船の一端から他端へ上記６槽を順次オーバーフ
ローして通過し、無害化された処理水が塩素混和室（５
８）から海へ放流される。By the way, in offshore treatment of sewage, a barge (51) incorporating a sewage treatment plant is used, as shown in FIG. Is this barge (51) distributed from one end to the other?
! (52), a first settling tank (53), an aeration tank (54), a final settling tank (55), and a chlorine mixing tank (56) by a partition wall. The sewage is then disposed of at land facilities (5
7) to the offshore storage tank buoy (58) and the onboard pump (
The treated water is sent to the distribution M (52) of the barge (51) via the barge (59), overflows from one end of the barge to the other end of the barge, passes through the above six tanks, and the detoxified treated water is sent to the chlorine mixing room. (5
8) is discharged into the sea.
上記構成の汚水の洋上処理では、汚水処理プラントを組
込んだ台船（５１）は、当然のことながら洋上に配され
ているため、汚水処理は気象条件、特に海水温度によっ
て大きく影響される。In the above-mentioned offshore treatment of sewage, the barge (51) incorporating the sewage treatment plant is naturally placed on the ocean, so the sewage treatment is greatly influenced by weather conditions, especially seawater temperature.
そこでこの対策として、曝気槽（５４）および最終沈澱
槽（５５）の温度を微生物の増殖しやすい至適温度に維
持するために、ボイラやエンジンの排ガスを利用するこ
とが考えられるが、この場合燃料費が莫大なものとなり
、現実的でない。そのため洋上における汚水処理は、上
記の如き温度維持の困難性が大きな障害になり、未だ実
用化されていない。Therefore, as a countermeasure to this problem, it is possible to use the exhaust gas from the boiler or engine in order to maintain the temperature of the aeration tank (54) and final settling tank (55) at the optimum temperature where microorganisms can easily grow. Fuel costs would be enormous, making it unrealistic. For this reason, offshore wastewater treatment has not yet been put to practical use because of the difficulty in maintaining temperature as described above.
この発明の目的は、上記の如き実情に鑑み、曝気槽およ
び最終沈澱槽の温度を少ない費用で微生物増殖の至適温
度に維持することができるｔり水ないし汚泥の生物学的
処理方法を提供するにある。In view of the above-mentioned circumstances, an object of the present invention is to provide a biological treatment method for wastewater or sludge that can maintain the temperature of an aeration tank and a final settling tank at an optimum temperature for microbial growth at a low cost. There is something to do.
問題点の解決手段
この発明の第１のものは、汚水処理プラントまたは同プ
ラントを組込んだ台船の曝気槽および最終沈澱槽におい
て、これら槽からそれぞれ排出される処理水の廃熱を利
用して、ヒートポンプによって同処理水の温度より高温
の熱を得、この熱によって曝気槽および最終沈澱槽の温
度を所要値に保つことを特徴とする、汚水処理における
廃熱を利用した生物学的処理方法である（以下この発明
を第１発明という）。Means for Solving Problems The first aspect of the present invention is to utilize the waste heat of treated water discharged from each of the aeration tank and final settling tank of a sewage treatment plant or a barge incorporating the same plant. Biological treatment using waste heat in wastewater treatment, characterized by obtaining heat higher than the temperature of the treated water using a heat pump, and using this heat to maintain the temperature of the aeration tank and final settling tank at the required value. (hereinafter, this invention will be referred to as the first invention).
第１発明の方法によって、曝気槽および最終沈澱槽の温
度は、微生物を増殖させるための至適温度に維持される
。By the method of the first invention, the temperatures of the aeration tank and the final settling tank are maintained at optimal temperatures for growing microorganisms.
また、この発明の第２のものは、汚水処理プラントまた
は同プラントを組込んだ台船の汚泥処理用の消化槽にお
いて、四槽から放流される処理水の廃熱を利用して、ヒ
ートポンプによって同処理水の温度より高温の熱を得、
この熱によって消化槽の温度を所要値に保つことを特徴
とする、汚泥処理における廃熱を利用した生物学的処理
方法である（以下この発明を第２発明という）。The second aspect of the present invention is a heat pump that utilizes the waste heat of treated water discharged from four tanks in a sludge treatment digestion tank of a sewage treatment plant or a barge incorporating the same plant. Obtains heat higher than the temperature of the treated water,
This is a biological treatment method using waste heat in sludge treatment, characterized in that the temperature of the digestion tank is maintained at a required value by this heat (hereinafter, this invention will be referred to as the second invention).
第２発明の方法によって、浄化槽の温度は、汚泥の嫌気
的消化のための微生物の増殖に好適な３０〜３７℃に維
持され、汚泥の腐敗発酵が進行させられる。この汚泥腐
敗発酵の結果、汚泥中の有機物が微生物の作用によって
分解されて、メタンガスが発生する。このメタンガスは
、消化槽の加温および攪拌などに使用され、さらに脱水
後の汚泥の乾燥および最終汚泥の焼却処理のための燃料
として使用される。According to the method of the second invention, the temperature of the septic tank is maintained at 30 to 37°C, which is suitable for the growth of microorganisms for anaerobic digestion of sludge, and the putrefaction and fermentation of sludge proceeds. As a result of this sludge putrefaction and fermentation, organic matter in the sludge is decomposed by the action of microorganisms and methane gas is generated. This methane gas is used for heating and stirring the digestion tank, and is further used as a fuel for drying the sludge after dewatering and incinerating the final sludge.
実施例
つぎに、この発明をより具体的に説明するために、この
発明の実施例を挙げる。EXAMPLES Next, examples of the present invention will be described in order to explain the present invention more specifically.
実施例１（第１発明に相当する）
第１図および第２図において、汚水処理プラントを組込
んだ台船（１）が洋上の所要位置に固定されている。台
船（１）は、一端から他端に、分配槽（２）と最初沈澱
槽（３）と曝気槽（４）と最終沈澱槽（５）と塩素混和
槽（６）とに、仕切壁によって区画されている。さらに
台船（１）にはｌＴｉ泥処理用の消化槽（図示省略）が
設けられている。汚水は、陸上施設（７）から洋上の貯
槽ブイ（８）および船上のポンプ（９）を介して台船（
１）の分配槽（２）に送入され、台船の一端から他端へ
上記６槽を順次オーバーフローして通過し、無害化され
た処理水が塩素混和室（８）から海へ放流される。Example 1 (corresponding to the first invention) In FIGS. 1 and 2, a barge (1) incorporating a sewage treatment plant is fixed at a predetermined position on the ocean. The barge (1) has, from one end to the other, a distribution tank (2), an initial settling tank (3), an aeration tank (4), a final settling tank (5), and a chlorine mixing tank (6) with partition walls. It is divided by. Furthermore, the barge (1) is provided with a digestion tank (not shown) for treating lTi mud. Sewage is transported from the onshore facility (7) to the barge (by way of the offshore storage tank buoy (8) and the onboard pump (9)).
The treated water is sent to the distribution tank (2) of 1), sequentially overflows and passes through the above six tanks from one end of the barge to the other, and the detoxified treated water is discharged into the sea from the chlorine mixing room (8). Ru.
曝気槽（４）は断熱材たとえばコンクリート製の外壁（
１０）と、鋼製の内壁（１１）とからなる二重隔壁構造
に構成されている。ただし、外壁（ｌＯ）の頂部は鋼製
であり、内壁（１１）は全体に鋼製である。The aeration tank (4) has a heat insulating material such as a concrete outer wall (
10) and a steel inner wall (11). However, the top of the outer wall (lO) is made of steel, and the inner wall (11) is entirely made of steel.
曝気ｈ５ （４）の外部にはヒートポンプ（１２）が設
置されている。そして曝気槽（４）から排出された処理
水がヒートポンプ（１２）に通され、ついで海へ放流さ
れるか、または後流側の最終沈澱槽へ送られている。ま
た真水または海水が、曝気槽（４）の外壁（１０）と内
壁（１１）の間の壁間部（１３）と、ヒートポンプ（１
２）との間を循環させられている。曝気槽（４）の処理
水の温度および曝気槽（４）の壁間部（Ｉ３）から出る
循環水の温度は、いずれも２０〜２５℃である。上記処
理水および循環水がそれぞれヒートポンプ（１２）に通
され、処理水の温度より高温の熱が循環水に与えられる
。その結果、循環水の温度は４０〜４５℃に昇温され、
この高温循環水が壁間部（１３）に流入して、曝気槽（
４）の温度を微生物の増殖しやすい至適温度に保ってい
る。A heat pump (12) is installed outside the aeration h5 (4). The treated water discharged from the aeration tank (4) is passed through a heat pump (12) and then discharged into the sea or sent to the final settling tank on the downstream side. In addition, fresh water or seawater enters the space between the walls (13) between the outer wall (10) and the inner wall (11) of the aeration tank (4) and the heat pump (1).
2). The temperature of the treated water in the aeration tank (4) and the temperature of the circulating water exiting from the interwall portion (I3) of the aeration tank (4) are both 20 to 25°C. The treated water and the circulating water are each passed through a heat pump (12), and heat higher than the temperature of the treated water is applied to the circulating water. As a result, the temperature of the circulating water is raised to 40-45℃,
This high temperature circulating water flows into the wall space (13) and the aeration tank (
4) The temperature is maintained at an optimal temperature where microorganisms can easily grow.
以上は曝気槽（４）についての構成の説明であるが、最
終沈澱槽（５）の構成も曝気槽（４）のものと全く同じ
であるので、この説明は省略する。The above is a description of the configuration of the aeration tank (4), but since the configuration of the final settling tank (5) is also exactly the same as that of the aeration tank (4), this description will be omitted.
実施例２（第２発明に相当する）
第３図において、汚水処理プラントを組込んだ台船（１
）の汚泥処理用の１段目の消化槽（１４）は、断熱材た
とえばコンクリート製の外壁（２０）と、鋼製の内壁（
２１）とからなる二重隔壁構造に構成されている。消化
槽（１４）の外部にはヒートポンプ（２２）が設置され
ている。そして汚水処理プラントから排出された処理水
がヒートポンプ（２２）に通され、ついで海へ放流され
ている。また真水または海水が、消化槽（１４）の外壁
（２０）と内壁（２１）の間の壁間部（２３）と、ヒー
トポンプ（２２）との間を循環させられている。上記処
理水の温度温度は２０〜２５℃である。上記処理水およ
び循環水がそれぞれヒートポンプ（２２）に通され、処
理水の温度より高温の熱が循環水に与えられる。その結
果、循環水の温度は４０〜４５℃に昇温され、この高温
循環水が壁間部（２３）に流入して消化槽（１４）の温
度を微生物の増殖しやすい至適温度である３０〜３７℃
に保っている。Example 2 (corresponding to the second invention) In Fig. 3, a barge (1
The first-stage digestion tank (14) for sludge treatment in ) has an outer wall (20) made of insulation material, such as concrete, and an inner wall (
21), it has a double partition wall structure. A heat pump (22) is installed outside the digestion tank (14). The treated water discharged from the sewage treatment plant is passed through a heat pump (22) and then discharged into the sea. Further, fresh water or seawater is circulated between the interwall portion (23) between the outer wall (20) and the inner wall (21) of the digestion tank (14) and the heat pump (22). The temperature of the treated water is 20 to 25°C. The treated water and the circulating water are each passed through a heat pump (22), and heat higher than the temperature of the treated water is applied to the circulating water. As a result, the temperature of the circulating water is raised to 40 to 45°C, and this high-temperature circulating water flows into the interwall portion (23) to maintain the temperature of the digestion tank (14) at an optimal temperature at which microorganisms can easily grow. 30-37℃
It is kept in
こうして１段目の消化槽（１４）において上記温度で攪
拌下に汚泥の嫌気処理が約２０日間行なわれた後、汚泥
は２段目の消化槽へ移され、ここで約１０日間静置され
、固相と液相に分離される。１段目の消化槽での汚泥の
腐敗発酵の結果、汚泥中の有機物が微生物の作用によっ
て分解されて、メタンガスが発生する。このメタンガス
を舟いて、消化槽の加温および攪拌が行なわれる。さら
にこのメタンガスを燃料として使用して、脱水後の汚泥
（水分含量８０％以上）の乾燥および最終汚泥の焼却処
分が行なわれる。After anaerobic treatment of the sludge was performed in the first-stage digestion tank (14) at the above temperature with stirring for about 20 days, the sludge was transferred to the second-stage digestion tank, where it was left standing for about 10 days. , separated into solid phase and liquid phase. As a result of the putrefaction and fermentation of the sludge in the first stage digestion tank, the organic matter in the sludge is decomposed by the action of microorganisms and methane gas is generated. This methane gas is used to heat and stir the digestion tank. Furthermore, this methane gas is used as a fuel to dry the dehydrated sludge (water content of 80% or more) and to incinerate the final sludge.
発明の効果
第１発明によれば、曝気槽および最終沈澱槽の温度を、
汚水処理のための微生物の増殖に好適な温度に、少ない
費用で維持することができる。Effects of the invention According to the first invention, the temperature of the aeration tank and the final settling tank is
Temperatures suitable for the growth of microorganisms for wastewater treatment can be maintained at low cost.
また、第２発明によれば、消化槽の温度を汚泥の嫌気的
消化のための微生物の増殖に好適な温度に、少ない費用
で維持することができる。Moreover, according to the second invention, the temperature of the digestion tank can be maintained at a temperature suitable for the growth of microorganisms for anaerobic digestion of sludge at a low cost.
さらに汚泥の腐敗発酵の結果発生したメタンガスを燃料
として用いて、脱水後の汚泥の乾燥および最終汚泥の焼
却処分を行なうことができ、汚泥焼却用の燃料代を大幅
に削減することができる。Furthermore, the methane gas generated as a result of sludge putrefaction and fermentation can be used as fuel to dry the sludge after dewatering and incinerate the final sludge, making it possible to significantly reduce the cost of fuel for sludge incineration.
第１図および第２図はそれぞれ第１発明の実施例を示す
台船の縦断面図および横断面図、第３図は第２発明の実
施例を示す台船の横断面図、第４図は従来技術を示す台
船の縦断面図である。
（１）・・・台船、（４）・・・曝気槽、（５）・・・
最終沈澱槽、（１０） （２０）・・・外壁、（１１）
（２１）・・・内壁、（１２）（２２）・・・ヒート
ポンプ、（１３）（２３）・・・壁間部。
以上1 and 2 are a vertical cross-sectional view and a cross-sectional view of a barge showing an embodiment of the first invention, respectively, FIG. 3 is a cross-sectional view of a barge showing an embodiment of the second invention, and FIG. 1 is a vertical cross-sectional view of a barge showing the prior art. (1)...Barge, (4)...Aeration tank, (5)...
Final settling tank, (10) (20)...Outer wall, (11)
(21)...Inner wall, (12)(22)...Heat pump, (13)(23)...Interwall portion. that's all
Claims (2)
船の曝気槽および最終沈澱槽において、これら槽からそ
れぞれ排出される処理水の廃熱を利用して、ヒートポン
プによって同処理水の温度より高温の熱を得、この熱に
よって曝気槽および最終沈澱槽の温度を所要値に保つこ
とを特徴とする、汚水処理における廃熱を利用した生物
学的処理方法。(1) In the aeration tank and final settling tank of a sewage treatment plant or a barge incorporating the same plant, the waste heat of the treated water discharged from these tanks is used to raise the temperature of the treated water to a higher temperature using a heat pump. 1. A biological treatment method using waste heat in wastewater treatment, which is characterized in that the temperature of an aeration tank and a final settling tank is maintained at a required value using this heat.
船の汚泥処理用の消化槽において、同槽から放流される
処理水の廃熱を利用して、ピートポンプによって同処理
水の温度より高温の熱を得、この熱によって消化槽の温
度を所要値に保つことを特徴とする、汚泥処理における
廃熱を利用した生物学的処理方法。(2) In a sludge treatment digestion tank of a sewage treatment plant or a barge incorporating the same plant, the waste heat of the treated water discharged from the tank is used to raise the temperature of the treated water higher than the temperature of the treated water using a peat pump. A biological treatment method that utilizes waste heat in sludge treatment, which is characterized by obtaining heat and using this heat to maintain the temperature of the digestion tank at a required value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33464188A JPH02180697A (en) | 1988-12-28 | 1988-12-28 | Biological treatment utilizing waste heat in sewage or sludge treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33464188A JPH02180697A (en) | 1988-12-28 | 1988-12-28 | Biological treatment utilizing waste heat in sewage or sludge treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02180697A true JPH02180697A (en) | 1990-07-13 |
Family
ID=18279641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33464188A Pending JPH02180697A (en) | 1988-12-28 | 1988-12-28 | Biological treatment utilizing waste heat in sewage or sludge treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02180697A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999001388A1 (en) * | 1997-07-03 | 1999-01-14 | Skoda J.S. S.R.O. | Method and equipment for off-shore treatment of communal sewage water |
| CN101973663A (en) * | 2010-09-21 | 2011-02-16 | 重庆文理学院 | Stepped water treatment experimental facility and process |
| JP2015142880A (en) * | 2014-01-31 | 2015-08-06 | 株式会社神鋼環境ソリューション | Digester made of steel plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845791A (en) * | 1981-09-12 | 1983-03-17 | Kurushima Group Kyodo Gijutsu Kenkyusho:Kk | Treatment of night soil for purpose of increasing marine product |
| JPS5895597A (en) * | 1981-12-02 | 1983-06-07 | Ebara Infilco Co Ltd | Anaerobic digesting treatment |
| JPS6128496A (en) * | 1984-07-19 | 1986-02-08 | Ataka Kogyo Kk | Platform ship for excretion treatment plant |
-
1988
- 1988-12-28 JP JP33464188A patent/JPH02180697A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845791A (en) * | 1981-09-12 | 1983-03-17 | Kurushima Group Kyodo Gijutsu Kenkyusho:Kk | Treatment of night soil for purpose of increasing marine product |
| JPS5895597A (en) * | 1981-12-02 | 1983-06-07 | Ebara Infilco Co Ltd | Anaerobic digesting treatment |
| JPS6128496A (en) * | 1984-07-19 | 1986-02-08 | Ataka Kogyo Kk | Platform ship for excretion treatment plant |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999001388A1 (en) * | 1997-07-03 | 1999-01-14 | Skoda J.S. S.R.O. | Method and equipment for off-shore treatment of communal sewage water |
| CN101973663A (en) * | 2010-09-21 | 2011-02-16 | 重庆文理学院 | Stepped water treatment experimental facility and process |
| JP2015142880A (en) * | 2014-01-31 | 2015-08-06 | 株式会社神鋼環境ソリューション | Digester made of steel plate |
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