JPH0741255B2 - Wastewater treatment equipment - Google Patents
Wastewater treatment equipmentInfo
- Publication number
- JPH0741255B2 JPH0741255B2 JP20295987A JP20295987A JPH0741255B2 JP H0741255 B2 JPH0741255 B2 JP H0741255B2 JP 20295987 A JP20295987 A JP 20295987A JP 20295987 A JP20295987 A JP 20295987A JP H0741255 B2 JPH0741255 B2 JP H0741255B2
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- anaerobic
- tank
- aerobic
- section
- 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 - Lifetime
Links
- 238000004065 wastewater treatment Methods 0.000 title claims description 40
- 239000007788 liquid Substances 0.000 claims description 29
- 238000001914 filtration Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 3
- 244000005700 microbiome Species 0.000 description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 7
- 229910017604 nitric acid Inorganic materials 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、排水処理装置に係わり、特に生物的脱窒素法
を用いた排水処理装置に関する。The present invention relates to wastewater treatment equipment, and more particularly to wastewater treatment equipment using a biological denitrification method.
第４図は、生物的脱窒素法を用いた従来の排水処理装置
の一例を示すもので、この排水処理装置は、原水槽11、
嫌気性処理槽13,沈澱槽15,好気性処理槽17,沈澱槽19,ポ
ンプ槽21および砂濾過槽23を水平方向に配置して構成さ
れており、嫌気性処理槽13には、原水槽11からの原水が
ポンプ25により供給され、また、沈澱槽15およびポンプ
槽21からの処理液がそれぞれポンプ27,29により循環さ
れている。FIG. 4 shows an example of a conventional wastewater treatment equipment using the biological denitrification method.
An anaerobic treatment tank 13, a sedimentation tank 15, an aerobic treatment tank 17, a precipitation tank 19, a pump tank 21 and a sand filtration tank 23 are horizontally arranged, and the anaerobic treatment tank 13 includes a raw water tank. Raw water from 11 is supplied by a pump 25, and treatment liquids from the settling tank 15 and the pump tank 21 are circulated by pumps 27 and 29, respectively.
また、好気性処理槽17には、沈澱槽19内の処理液がポン
プ31により循環され、ポンプ槽21内の処理液は、ポンプ
33によりタンク35を介して砂濾過槽23に移送されてい
る。Further, in the aerobic treatment tank 17, the treatment liquid in the precipitation tank 19 is circulated by the pump 31, and the treatment liquid in the pump tank 21 is pumped.
It is transferred to the sand filter tank 23 by the tank 33 via the tank 35.
このような排水処理装置では、原水中に含まれるアンモ
ニアは、好気性処理槽17内の好気性微生物により酸化さ
れ、硝酸とされ、酸化された硝酸は、ポンプ29により処
理液とともに嫌気性処理槽13に運搬され、この嫌気性処
理槽13において、嫌気性微生物により窒素ガスに還元さ
れる。In such a wastewater treatment apparatus, ammonia contained in raw water is oxidized by aerobic microorganisms in the aerobic treatment tank 17 to be nitric acid, and the oxidized nitric acid is treated by the pump 29 together with the treatment liquid in the anaerobic treatment tank. It is transported to 13 and is reduced to nitrogen gas by anaerobic microorganisms in this anaerobic treatment tank 13.
しかしながら、このような従来の排水処理装置では、嫌
気性処理槽13内の嫌気性微生物の汚泥令が長く、また、
フロック径が小さいため、表面積の大きい沈澱槽15,19
を設ける必要があり装置のスペースが非常に大きくなる
という問題があった。However, in such a conventional wastewater treatment equipment, the sludge age of anaerobic microorganisms in the anaerobic treatment tank 13 is long, and
Precipitation tank with large surface area due to small flock diameter 15,19
However, there is a problem that the space of the apparatus becomes very large.
本発明は、上記のような問題を解決したもので、従来よ
り大幅に装置の小型化を図ることのできる排水処理装置
を提供することを目的とする。The present invention solves the above problems, and an object of the present invention is to provide a wastewater treatment device that can be made much smaller than conventional devices.
本発明にかかわる排水処理装置は、円筒状の排水処理槽
と、この排水処理槽の下部に配置される嫌気性処理部
と、前記排水処理槽の上部に配置される好気性処理部
と、前記排水処理槽の中央部に配置され下端を前記嫌気
性処理部に開口するとともに上端開口を前記好気性処理
部の液面よりも上方に位置される筒状の固液分離部と、
前記好気性処理部と嫌気性処理部との間に配置され好気
性処理部と嫌気性処理部とを濾材を介して連通する濾材
部と、前記好気性処理部と前記嫌気性処理部との間に配
置され前記好気性処理部の処理液を濾過する濾過部と、
前記嫌気性処理部に開口する原水供給管と、前記濾過部
で濾過された濾過液を排水処理槽から外部に排出する排
出管とを備えたものである。The wastewater treatment apparatus according to the present invention includes a cylindrical wastewater treatment tank, an anaerobic treatment unit arranged at a lower portion of the wastewater treatment tank, an aerobic treatment unit arranged at an upper portion of the wastewater treatment tank, and A cylindrical solid-liquid separation unit arranged at the center of the wastewater treatment tank and having a lower end opened to the anaerobic treatment unit and an upper end opening located above the liquid surface of the aerobic treatment unit,
Of the aerobic treatment section and the anaerobic treatment section, a filter medium section that communicates the aerobic treatment section and the anaerobic treatment section through a filter medium, the aerobic treatment section and the anaerobic treatment section A filter unit disposed between the filters for filtering the treatment liquid of the aerobic treatment unit,
It is provided with a raw water supply pipe opening to the anaerobic treatment unit and a discharge pipe for discharging the filtrate filtered by the filtration unit from the waste water treatment tank to the outside.
本発明においては、原水は、原水供給管により排水処理
槽の下部の嫌気性処理部に導かれた後、固液分離部を通
り、排水処理槽の上部の好気性処理部に導かれる。一
方、好気性処理部の一部の処理液は、濾材部を通り嫌気
性処理部に循環され、また、一部は、濾過部で濾過され
た後、排出管から排出処理槽外に排出される。In the present invention, the raw water is guided by the raw water supply pipe to the anaerobic treatment section in the lower part of the wastewater treatment tank, then passes through the solid-liquid separation section, and is introduced to the aerobic treatment section in the upper part of the wastewater treatment tank. On the other hand, a part of the treatment liquid in the aerobic treatment part is circulated to the anaerobic treatment part through the filter medium part, and a part of the treatment liquid is filtered by the filtration part and then discharged from the discharge pipe to the outside of the discharge treatment tank. It
そして、原水中に含まれるアンモニアは、好気性処理部
内の好気性微生物により酸化され、硝酸とされ、酸化さ
れた硝酸は、嫌気性処理部において、嫌気性微生物によ
り窒素ガスに還元される。Then, the ammonia contained in the raw water is oxidized by aerobic microorganisms in the aerobic treatment section to be nitric acid, and the oxidized nitric acid is reduced to nitrogen gas by the anaerobic microorganisms in the anaerobic treatment section.
以下、本発明の詳細を図面に示す一実施例について説明
する。An embodiment of the present invention will be described below in detail with reference to the drawings.
第１図および第２図は、本発明の排水処理装置の一実施
例を示すもので、図において符号41は、円筒状の排水処
理槽を示している。FIG. 1 and FIG. 2 show an embodiment of the wastewater treatment equipment of the present invention, in which reference numeral 41 indicates a cylindrical wastewater treatment tank.
この排水処理槽41の下部には、嫌気性処理部43が配置さ
れている。この嫌気性処理部43には、嫌気性微生物を付
着させるための浮遊型の濾材45が多数収容されている。
この濾材45は、比較的比重が大きく、また、大径のもの
が望ましく、例えば、第３図に示すように、鉄心47の周
りを樹脂49で覆った球体が用いられる。An anaerobic treatment section 43 is arranged below the wastewater treatment tank 41. The anaerobic treatment section 43 accommodates a large number of floating type filter media 45 for adhering anaerobic microorganisms.
The filter medium 45 preferably has a relatively large specific gravity and a large diameter. For example, as shown in FIG. 3, a sphere having an iron core 47 covered with a resin 49 is used.
排水処理槽41の上部には、好気性処理部51が配置されて
おり、この好気性処理部51には、この好気性処理部51
に、ブロアー52からの空気を供給するための空気供給管
53が配置されている。An aerobic treatment unit 51 is arranged above the wastewater treatment tank 41, and the aerobic treatment unit 51 includes the aerobic treatment unit 51.
, An air supply pipe for supplying air from the blower 52
53 are arranged.
排水処理槽41の中央部には、円筒部材54により、固液分
離部56が形成されている。円筒部材54は、下端を嫌気性
処理部43に開口されており、また、上端開口を好気性処
理部51の液面よりも上方に位置されている。At the center of the wastewater treatment tank 41, a solid-liquid separating section 56 is formed by the cylindrical member 54. The cylindrical member 54 has a lower end opened to the anaerobic treatment section 43, and an upper end opening located above the liquid surface of the aerobic treatment section 51.
好気性処理部51と嫌気性処理部43との間には、好気性処
理部51と嫌気性処理部43とを連通する扇状の濾材部55が
配置されており、この濾材部55には、比較的粒径の大き
い濾材57が多数収容されている。これ等の濾材57は、金
網あるいは格子状の支持部材59上に載置されている。Between the aerobic treatment section 51 and the anaerobic treatment section 43, a fan-shaped filter medium section 55 that connects the aerobic treatment section 51 and the anaerobic treatment section 43 is arranged, and in the filter medium section 55, A large number of filter media 57 having a relatively large particle size are accommodated. These filter media 57 are placed on a wire mesh or grid-like support member 59.
さらに、好気性処理部51と嫌気性処理部43との間には、
好気性処理部51の処理液を濾過する扇状の濾過部61が配
置されている。この濾過部61には、砂，アンスラサイト
等の比較的粒径の小さい濾材63が収容されており、これ
等の濾材63は、底壁65上に載置されている。また、濾材
部55と濾過部61との間は、隔壁67により分離されてい
る。Furthermore, between the aerobic treatment unit 51 and the anaerobic treatment unit 43,
A fan-shaped filter unit 61 for filtering the treatment liquid of the aerobic treatment unit 51 is arranged. The filtering portion 61 accommodates filter media 63 having a relatively small particle size such as sand and anthracite, and these filter media 63 are placed on the bottom wall 65. Further, the filter material portion 55 and the filter portion 61 are separated by a partition wall 67.
嫌気性処理部43には、原水供給管69が開口しており、ま
た、底部に溜まった汚泥を引き抜くための引き抜き管70
が開口している。この引き抜き管70には、開閉弁71が配
置されている。A raw water supply pipe 69 is opened in the anaerobic treatment section 43, and a withdrawal pipe 70 for withdrawing sludge accumulated at the bottom is provided.
Is open. An on-off valve 71 is arranged in the drawing pipe 70.
また、固液分離部56には、この固液分離部56に上向流を
生じさせるための上向流発生装置73が配置されている。
この上向流発生装置73は、モータ75により回転される回
転軸77に沿ってファン79を固着して構成されている。Further, the solid-liquid separation unit 56 is provided with an upward flow generator 73 for generating an upward flow in the solid-liquid separation unit 56.
The upflow generator 73 is configured by fixing a fan 79 along a rotating shaft 77 rotated by a motor 75.
さらに、濾過部61には、この濾過部61で濾過された濾過
液を排水処理槽41から外部に排出する排出管81が開口し
ている。Further, a drain pipe 81 for discharging the filtered liquid filtered by the filtering unit 61 from the waste water treatment tank 41 to the outside is opened in the filtering unit 61.
以上のように構成された排水処理装置では、原水は、原
水供給管69により排水処理槽41の下部の嫌気性処理部43
に導かれた後、固液分離部56を通りながら固液分離さ
れ、排水処理槽41の上部の好気性処理部51に導かれる。In the waste water treatment apparatus configured as described above, raw water is supplied from the raw water supply pipe 69 to the anaerobic treatment section 43 under the waste water treatment tank 41.
Then, the solid-liquid separation is performed while passing through the solid-liquid separation unit 56, and the solid-liquid separation is guided to the aerobic treatment unit 51 above the wastewater treatment tank 41.
一方、好気性処理部51の一部の処理液は、濾材部55を通
り嫌気性処理部43に循環され、また、一部は、濾過部61
で濾過された後、排出管81から排水処理槽41外に排出さ
れる。On the other hand, a part of the treatment liquid of the aerobic treatment section 51 passes through the filter medium section 55 and is circulated to the anaerobic treatment section 43, and a part thereof is filtered by the filtration section 61.
After being filtered by, it is discharged from the drainage pipe 81 to the outside of the wastewater treatment tank 41.
そして、原水中に含まれるアンモニアは、好気性処理部
51内の好気性微生物により酸化され、硝酸とされ、酸化
された硝酸は、嫌気性処理部43において、嫌気性微生物
により窒素ガスに還元される。And the ammonia contained in the raw water is aerobic treatment part.
The nitric acid that has been oxidized by the aerobic microorganisms in 51 to form nitric acid, and the oxidized nitric acid is reduced to nitrogen gas by the anaerobic microorganisms in the anaerobic treatment section 43.
しかして、以上のように構成された排水処理装置では、
排水処理槽41の下部に嫌気性処理部43を、上部に好気性
処理部51を設けるとともに、固液分離部56によりこれ等
を連通し、さらに、嫌気性処理部43と好気性処理部51と
の間に濾材部55および濾過部61を設けたので、従来水平
方向に配置されていた嫌気性処理槽，好気性処理槽，沈
澱槽等を垂直方向に配置することが可能となり、設置面
積を従来の30％程度の面積にすることが可能となる。Then, in the wastewater treatment equipment configured as described above,
An anaerobic treatment section 43 is provided in the lower part of the waste water treatment tank 41, and an aerobic treatment section 51 is provided in the upper part thereof, and these are communicated with each other by a solid-liquid separation section 56, and further, the anaerobic treatment section 43 and the aerobic treatment section 51. Since the filter material part 55 and the filter part 61 are provided between the and, it becomes possible to vertically arrange the anaerobic treatment tank, the aerobic treatment tank, the precipitation tank, etc. which were conventionally arranged in the horizontal direction, and the installation area It is possible to reduce the area to about 30% of the conventional one.
また、以上のように構成された排水処理装置では、汚泥
発生量が減少し、また、撹拌機の動力が減少するため、
ランニングコストを、例えば、従来の70％程度とするこ
とが可能となる。Further, in the wastewater treatment device configured as described above, the amount of sludge generated is reduced, and the power of the stirrer is also reduced,
The running cost can be reduced to, for example, about 70% of the conventional value.
さらに、以上のように構成された排水処理装置では、固
液分離部56を設けたので、比較的浮遊物質が多い場合に
も、安定した処理を行なうことが可能となる。Furthermore, since the solid-liquid separation unit 56 is provided in the waste water treatment apparatus configured as described above, it is possible to perform stable treatment even when the amount of suspended solids is relatively large.
なお、以上述べた実施例では、嫌気性処理部43に濾材45
を収容した例について説明したが、本発明はかかる実施
例に限定されるものではなく、濾材を必ずしも収容しな
くても良いことは勿論である。In the embodiment described above, the anaerobic treatment section 43 has a filter medium 45.
However, the present invention is not limited to such an embodiment, and it goes without saying that the filter medium does not necessarily have to be accommodated.
以上述べたように、本発明では、排水処理装置を、円筒
状の排水処理槽と、この排水処理槽の下部に配置される
嫌気性処理部と、排水処理槽の上部に配置される好気性
処理部と、排水処理装置の中央部に配置され下端を嫌気
性処理部に開口するとともに上端開口を好気性処理部の
液面よりも上方に位置される筒状の固液分離部と、好気
性処理部と嫌気性処理部との間に配置され好気性処理部
と嫌気性処理部とを濾材を介して連通する濾材部と、好
気性処理部と嫌気性処理部との間に配置され好気性処理
部の処理液を濾過する濾過部と、嫌気性処理部に開口す
る原水供給管と、濾過部で濾過された濾過液を排水処理
槽から外部に排出する排出管とにより構成したので、従
来より大幅に装置に小型化を図ることができるという利
点がある。As described above, in the present invention, the wastewater treatment device is provided with a cylindrical wastewater treatment tank, an anaerobic treatment section arranged at the lower part of the wastewater treatment tank, and an aerobic property arranged at the upper part of the wastewater treatment tank. A treatment section and a cylindrical solid-liquid separation section which is arranged in the center of the wastewater treatment equipment and whose lower end is opened to the anaerobic treatment section and whose upper end opening is located above the liquid surface of the aerobic treatment section, A filter medium part that is arranged between the aerobic treatment part and the anaerobic treatment part and connects the aerobic treatment part and the anaerobic treatment part through a filter medium, and is arranged between the aerobic treatment part and the anaerobic treatment part. Since it is composed of a filtration part for filtering the treatment liquid of the aerobic treatment part, a raw water supply pipe opening to the anaerobic treatment part, and a discharge pipe for discharging the filtrate filtered by the filtration part from the wastewater treatment tank to the outside. However, there is an advantage that the size of the device can be significantly reduced as compared with the conventional one.
第１図は本発明の排水処理装置の一実施例を示す縦断面
図、第２図は第１図のII−II線に沿う横断面図、第３図
は嫌気性処理部に配置される濾材を示す縦断面図、第４
図は従来の排水処理装置を示す配管系統図である。 41……排水処理槽、43……嫌気性処理部、51……好気性
処理部、55……濾材部、56……固液分離部、61……濾過
部、69……原水供給管、73……移送管、81……排出管。FIG. 1 is a longitudinal sectional view showing an embodiment of the wastewater treatment equipment of the present invention, FIG. 2 is a transverse sectional view taken along line II-II of FIG. 1, and FIG. 3 is arranged in an anaerobic treatment section. Fourth longitudinal sectional view showing the filter medium, fourth
FIG. 1 is a piping system diagram showing a conventional wastewater treatment device. 41 ... Wastewater treatment tank, 43 ... Anaerobic treatment section, 51 ... Aerobic treatment section, 55 ... Filter material section, 56 ... Solid-liquid separation section, 61 ... Filtration section, 69 ... Raw water supply pipe, 73 …… Transfer pipe, 81 …… Discharge pipe.
Claims (1)
下部に配置される嫌気性処理部と、前記排水処理槽の上
部に配置される好気性処理部と、前記排水処理槽の中央
部に配置され下端を前記嫌気性処理部に開口するととも
に上端開口を前記好気性処理部の液面よりも上方に位置
される筒状の固液分離部と、前記好気性処理部と嫌気性
処理部との間に配置され好気性処理部と嫌気性処理部と
を濾材を介して連通する濾材部と、前記好気性処理部と
前記嫌気性処理部との間に配置され前記好気性処理部の
処理液を濾過する濾過部と、前記嫌気性処理部に開口す
る原水供給管と、前記濾過部で濾過された濾過液を排水
処理槽から外部に排出する排出管とを備えたことを特徴
とする排水処理装置。1. A cylindrical drainage treatment tank, an anaerobic treatment unit arranged at the bottom of the drainage treatment tank, an aerobic treatment unit arranged at the upper part of the drainage treatment tank, and A cylindrical solid-liquid separation part, which is arranged in the central part and has a lower end opened to the anaerobic treatment part and an upper end opening located above the liquid surface of the aerobic treatment part, the aerobic treatment part and anaerobic The aerobic treatment part and the anaerobic treatment part, which are arranged between the aerobic treatment part and the anaerobic treatment part, and are arranged between the aerobic treatment part and the anaerobic treatment part. A filtration unit for filtering the treatment liquid of the treatment unit, a raw water supply pipe opening to the anaerobic treatment unit, and a discharge pipe for discharging the filtrate filtered by the filtration unit from the wastewater treatment tank to the outside are provided. Wastewater treatment equipment characterized by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20295987A JPH0741255B2 (en) | 1987-08-14 | 1987-08-14 | Wastewater treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20295987A JPH0741255B2 (en) | 1987-08-14 | 1987-08-14 | Wastewater treatment equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6447496A JPS6447496A (en) | 1989-02-21 |
| JPH0741255B2 true JPH0741255B2 (en) | 1995-05-10 |
Family
ID=16465996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20295987A Expired - Lifetime JPH0741255B2 (en) | 1987-08-14 | 1987-08-14 | Wastewater treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0741255B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000060839A (en) * | 1999-03-19 | 2000-10-16 | 안세영 | Package type domestic and industrial wastewater treatment system |
| JP2010269203A (en) * | 2009-05-19 | 2010-12-02 | Nikkiso Co Ltd | Waste water treatment apparatus and control method thereof |
-
1987
- 1987-08-14 JP JP20295987A patent/JPH0741255B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6447496A (en) | 1989-02-21 |
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