JPH0232037B2 - - Google Patents
Info
- Publication number
- JPH0232037B2 JPH0232037B2 JP60071719A JP7171985A JPH0232037B2 JP H0232037 B2 JPH0232037 B2 JP H0232037B2 JP 60071719 A JP60071719 A JP 60071719A JP 7171985 A JP7171985 A JP 7171985A JP H0232037 B2 JPH0232037 B2 JP H0232037B2
- Authority
- JP
- Japan
- Prior art keywords
- weir body
- river
- framed
- purification treatment
- weir
- 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
- 239000000919 ceramic Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000008187 granular material Substances 0.000 claims description 13
- 238000000746 purification Methods 0.000 claims description 12
- 239000004927 clay Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 19
- 241000894006 Bacteria Species 0.000 description 17
- 239000010802 sludge Substances 0.000 description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 241001148470 aerobic bacillus Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 230000008635 plant growth Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 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
Description
【発明の詳細な説明】
本発明は、比較的高水深の河川等を対象に、そ
の浄化を行なうための改良された河川等の浄化処
理装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved river purification treatment apparatus for purifying rivers and the like having relatively high water depths.
従来から、比較的流量の大きい高水深系の河川
等の流水、例えば、有機系汚濁物質を含有する流
水の浄化処理法としては、例えば、河川の水路を
遮断する位置に、砂利等を収納したバケツトを設
け、この砂利に汚濁物質を吸着させ清浄化を行な
うことが知られている。 Conventionally, as a purification treatment method for flowing water such as deep rivers with relatively large flow rates, for example, running water containing organic pollutants, for example, gravel is stored in a position that blocks the river channel. It is known that a bucket is provided to adsorb pollutants to the gravel for cleaning.
しかし、このような砂利等を基材とする処理法
では、該砂利等自体の汚濁物質に対する吸着能が
小さいだけでなく、吸着後は何等処置されない状
態で蓄積しやがて離脱することになるので、河川
の清浄化効果は極めて少ないものとなり実用上問
題となるものであつた。 However, in such treatment methods that use gravel as a base material, not only does the gravel itself have a small adsorption capacity for pollutants, but after adsorption, the pollutants accumulate without any treatment and eventually fall off. The river cleaning effect was extremely small, posing a practical problem.
本発明はこのような従来の装置における欠点の
解消のためなされたものであつて、活性汚泥菌の
直径よりも大なる気孔径をもつ新規なポーラス状
セラミツクスに活性汚泥菌を固着させて濾材を構
成するとともに、該濾材を綱体等で枠組された堰
体に充てんさせ、該堰体の存在により河川の流れ
を変更させて該河川中の溶存酸素を増加させ、も
つて、被処理流体と前記セラミツクスに固着させ
た活性汚泥菌とを接触させることにより、活性汚
泥菌の増殖を促進するとともに、該堰体上に植物
の育成を助成させ、且つ、前記活性汚泥菌の生物
同化作用により河川等の流体の浄化を行ない、更
に、清浄化後においても流体の増量された溶存酸
素により河川の下層流の自然浄化を実施させる装
置を提供することを目的とし、その要旨とすると
ころは、河川の水路を流体と前記セラミツクスに
固着させた活性汚泥菌とを接触させることにより
河川等の浄化を行なう装置を提供することを目的
とし、その要旨とするところは、河川等の水路を
遮断する位置に設けられ、河底等に接し、且つ高
さを少なくとも前記河川等の水面よりも高く設定
された単数又は複数個の綱体で枠組された堰体
と、前記堰体内部に充てんされる、粘土を主成分
とし、これに気孔形成用材料を添加して焼成して
なるポーラス状セラミツクス粒状物とからなる河
川等の浄化処理装置にある。 The present invention was made in order to eliminate the drawbacks of conventional devices, and it uses a filter medium by fixing activated sludge bacteria to a new porous ceramic having a pore diameter larger than the diameter of the activated sludge bacteria. At the same time, the filter medium is filled in a weir body framed by a rope etc., and the presence of the weir body changes the flow of the river and increases dissolved oxygen in the river, thereby increasing the amount of dissolved oxygen in the fluid to be treated. By bringing the activated sludge bacteria fixed on the ceramics into contact with the activated sludge bacteria, the growth of the activated sludge bacteria is promoted, and the growth of plants on the weir body is supported. The purpose is to provide a device that purifies fluids such as rivers and other fluids, and furthermore, allows the lower flow of rivers to be naturally purified by the increased amount of dissolved oxygen in the fluid even after cleaning. The purpose is to provide a device for purifying rivers, etc. by bringing fluid into contact with activated sludge bacteria fixed on the ceramics, and the gist of the device is to clean the waterways of rivers, etc. A weir body framed by one or more rope bodies, which is installed in a riverbed, etc., and whose height is set at least higher than the water surface of the river, etc., and the inside of the weir body is filled. A purification treatment device for rivers, etc. is made of porous ceramic granules which are mainly composed of clay and are made by adding a pore-forming material and firing the clay.
以下、本発明の実施例を、添付図面に基づき具
体的に説明する。 Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
すなわち、第１図、第２図において、比較的高
水深系の河川Ｒ等を対象として、その水路を遮断
するように立設させた水処理用の堰体１は、ステ
ンレス線や亜鉛引き鉄線等の綱体から枠組され、
河底等と接するように固定具２２を用いて単数或
は流体の流量や水質を考慮して複数個として設置
されている。 That is, in Figures 1 and 2, the water treatment weir body 1, which is erected to block the waterway of relatively deep river R, etc., is made of stainless steel wire or galvanized wire. It is framed from rope bodies such as
They are installed either singly or in a plurality in consideration of fluid flow rate and water quality using fixtures 22 so as to be in contact with the riverbed or the like.
そして、この堰体１内には、ポーラスなセラミ
ツクス粒状物Ｃを充てんしてなる。 The weir body 1 is filled with porous ceramic particles C.
すなわち、このセラミツクス粒状物Ｃは、粘土
を主成分とし、これに気孔形成用材料、例えばオ
ガクズやモミガラ、ウレタン粉末等を添加して焼
成してなるポーラス状構造からなり、且つ、流水
等と接しても容易に変形或は粉末化しない硬度を
有し、しかも活性汚泥菌を定着させるのに必要な
表面積は前記処理部２内１m3充てんした場合
600000m2と広大であり、更に、該セラミツクス粒
状物Ｃは、活性汚泥菌を構成する一連の菌体、例
えば、好気性菌、中間菌、嫌気性菌等を各々培養
させるのに適した酸素の供給路を多枝的に有する
ポーラス状な形状となつている。 That is, the ceramic granules C have a porous structure made by mainly containing clay and adding pore-forming materials, such as sawdust, rice hulls, urethane powder, etc., and firing the mixture. It has a hardness that does not easily deform or turn into powder even when it is used, and the surface area necessary for establishing activated sludge bacteria is 1 m 3 in the processing section 2.
The ceramic granular material C has an area of 600,000 m 2 and is equipped with oxygen suitable for culturing a series of bacterial cells that make up activated sludge bacteria, such as aerobic bacteria, intermediate bacteria, and anaerobic bacteria. It has a porous shape with multiple supply channels.
なお、このセラミツクス粒状物Ｃの原料を粘土
と硅石とを混合して構成し、これに気孔形成用材
料を添加して焼成し、ポーラス状のセラミツクス
Ｃとなして前述のように充てん材として使用する
こともできる。 The raw material for this ceramic granule C is made up of a mixture of clay and silica stone, and a pore-forming material is added thereto and fired to form porous ceramic C, which is used as a filler as described above. You can also.
なお、前記水処理用堰体１は、被処理河川の巾
や深さ或は水質又は水流の強弱等を考慮して適宜
の形状に成形されるが、実使用時においては、該
堰体１の高さは少なくとも水面W.Lより高く設定
する。 The water treatment weir body 1 is formed into an appropriate shape taking into account the width, depth, water quality, strength of water flow, etc. of the river to be treated, but in actual use, the weir body 1 The height of is set at least higher than the water surface WL.
そして、前記堰体１の具体的な形状としては、
例えば、第１図、第２図にて示したように、底部
を巾広となした断面が半ダ円形状のものを製作し
使用してもよく、又、第３図のように円筒状に枠
組されたもの、第４図のように、その断面が半円
形状に枠組されたもの、又、第５図イに示すよう
に断面が矩形状なもの、更に、同図ロに示すよう
にその外枠に別体からなるアングル３等で補強し
たもの等を使用することもできる。 The specific shape of the weir body 1 is as follows:
For example, as shown in Figs. 1 and 2, a semi-circular cross section with a wide bottom may be manufactured and used, or a cylindrical one as shown in Fig. 3 may be used. As shown in Figure 4, the cross section is semicircular, and as shown in Figure 5 A, the cross section is rectangular. It is also possible to use a structure in which the outer frame is reinforced with a separate angle 3 or the like.
更に、第６図、第７図として示すように、前記
堰体１の底部に、石塊、レンガ或は砂利等の重量
物Ｗを内装し、該堰体１を河川に対し安定状態と
させた後、該重量物Ｗ上の堰体上部に、前記ポー
ラス状セラミツクス粒状物Ｃを充てんするように
してもよい。 Furthermore, as shown in FIGS. 6 and 7, a heavy object W such as a stone block, brick, or gravel is placed at the bottom of the weir body 1 to keep the weir body 1 in a stable state against the river. After that, the upper part of the weir body above the heavy object W may be filled with the porous ceramic particles C.
次に、本発明の装置に係る作用について説明す
ると、先ず、河川の上流側から流れてくる汚濁物
質を含む流体は、通常、水平流として前記堰体１
近傍まで流れてくるが、該水路を遮断するように
設けられた堰体１と、その内部に充てんされたポ
ーラス状セラミツクス粒状物Ｃにより、その流れ
を乱流、垂直流等の混在する流動状態と変更し
て、堰体１の通孔から内部のセラミツクス粒状物
Ｃと接触し、セラミツクス粒状物Ｃに固着されて
いる活性汚泥菌の生物同化作用等に伴い清浄化さ
れ河川の前方方向へと流下していくのである。 Next, to explain the operation related to the device of the present invention, first, fluid containing pollutants flowing from the upstream side of a river normally flows horizontally into the weir body 1.
However, due to the weir body 1 installed to block the waterway and the porous ceramic particles C filled inside the weir body 1, the flow is kept in a mixed flow state such as turbulent flow and vertical flow. The sludge comes into contact with the ceramic granules C inside through the through holes of the weir body 1, is purified by the bioassimilation of activated sludge bacteria fixed on the ceramic granules C, and moves forward in the river. It flows down.
この際、前記のように、流体を堰体１近傍で乱
流、垂直流等の流動状態とさせることにより流体
中の溶存酸素を増加させるとともに、該流体の構
成成分と、前記セラミツクス粒状物およびその表
面に固着されている活性汚泥菌とを均等に接触さ
せるようになし、且つ、前記媒体１の高さを図示
したように、流体の水面W.Lよりも高く設定する
ことにより、該流体全体の清浄化処理を実施でき
るようにさせ、もつて、前記堰体１内の活性汚泥
菌、すなわち、該堰体１内のセラミツクス粒状物
Ｃ表面に生息する好気性菌、該中間部の中間菌、
該奥面の嫌気性菌の作用により一工程で前記被処
理流体の清浄化を実施し、且つ、前記溶存酸素の
増大化により活性汚泥菌の増殖を促す相乗作用を
行わせるものとなる。 At this time, as described above, by bringing the fluid into a fluid state such as turbulent flow or vertical flow near the weir body 1, dissolved oxygen in the fluid is increased, and the constituent components of the fluid and the ceramic particles and By uniformly contacting the activated sludge bacteria fixed on the surface of the medium 1, and by setting the height of the medium 1 higher than the water surface WL of the fluid as shown in the figure, the entire fluid is By making it possible to carry out the cleaning treatment, the activated sludge bacteria in the weir body 1, that is, the aerobic bacteria living on the surface of the ceramic granules C in the weir body 1, the intermediate bacteria in the intermediate part,
The action of the anaerobic bacteria on the inner surface cleans the fluid to be treated in one step, and the increase in dissolved oxygen creates a synergistic effect that promotes the growth of activated sludge bacteria.
又、この溶存酸素の増大化に伴つて、例えば、
水面W.L上へ露出している堰体１上へ植物Ｐの成
育に必要な養分等を培養させることができるの
で、この養分を基に前記堰体１上へ図示のように
植物Ｐの自然育成を促し、この植物Ｐ等の吸着機
能によつて間接的に流体中の汚濁物質を浄化させ
ることも可能となる。 Also, with this increase in dissolved oxygen, for example,
Nutrients necessary for the growth of plants P can be cultured on the weir body 1 exposed above the water surface WL, so that the plants P can be naturally grown on the weir body 1 based on these nutrients as shown in the figure. It also becomes possible to indirectly purify pollutants in the fluid through the adsorption function of the plants P and the like.
更に、前記セラミツクス粒状物Ｃに固着された
活性汚泥菌等を主体に清浄化された後、放流され
た流体は、該流体の増大された溶存酸素量によつ
て、河川下層流に対する自然浄化作用を促進させ
ることになるのである。 Furthermore, after being purified mainly by activated sludge bacteria etc. fixed to the ceramic granules C, the discharged fluid has a natural purification effect on the lower river flow due to the increased amount of dissolved oxygen in the fluid. This will promote
なお、第５図ロで示したように、例えば矩形状
の堰体１周端面に、更に、厚肉のアングル３を取
付けた場合は、河川の流れの強さや、変流等に対
する補強体として働き、該堰体１の清浄化処理機
能を保持するものとなる。 As shown in Fig. 5B, for example, if a thick angle 3 is attached to the end surface of the rectangular weir body 1, it can be used as a reinforcement against the strength of the river flow, current changes, etc. This serves to maintain the cleaning function of the weir body 1.
以上のように、本発明に係る河川等の浄化処理
装置は、河川等の水路を遮断する位置に設けら
れ、河底等と接し、且つその高さを少なくとも前
記河川等の水面よりも高く設定された単数又は複
数個の綱体で枠組された水処理用の堰体と、前記
堰体内に充てんされるポーラス状セラミツクス粒
状物とからなるものであるから、汚濁物質等を含
有する河川の流体は、該水路を遮断する位置に、
単数、或は複数個設けられた水処理用の堰体によ
り、水平状態の流れから乱流、垂直流等の流動状
態に変更され、前記堰体内の前記ポーラス状セラ
ミツクス粒状物に固着させた活性汚泥菌等により
極めて高い効率で清浄化処理されるものとなる。 As described above, the river purification treatment apparatus according to the present invention is installed at a position that blocks a waterway such as a river, is in contact with the riverbed, etc., and has its height set at least higher than the water surface of the river etc. The structure consists of a weir body for water treatment framed by one or more rope bodies, and porous ceramic particles filled in the weir body, so that river fluid containing pollutants etc. is at a position that blocks the waterway,
The flow state is changed from a horizontal state to a turbulent flow, a vertical flow, etc. by one or more weir bodies for water treatment, and the activity is fixed to the porous ceramic granules in the weir body. The sludge bacteria and the like can be used to clean the sludge with extremely high efficiency.
又、その構造は簡便な形状の堰体と、活性汚泥
菌の定着に好適なポーラス状セラミツクス粒状物
との組合せからなるので、各種河川に対して容易
に設置でき、且つ、処理後の流体は溶存酸素量の
増化に伴つて更に河川の自然浄化を促し、高度処
理されることになるので、広く再使用に供するこ
とができるものとなるのである。 In addition, its structure consists of a combination of a simple-shaped weir body and porous ceramic granules suitable for the colonization of activated sludge bacteria, so it can be easily installed in various rivers, and the fluid after treatment is As the amount of dissolved oxygen increases, the natural purification of the river is further promoted and the water is highly processed, making it widely reusable.
第１図、第２図は、本発明に係る河川等の浄化
処理装置の使用状態を示す説明図、第３図、第４
図、第５図イ，ロ、第６図、第７図は同各々別の
堰体構成を示す説明図である。
１…堰体、２…固定具、３…アングル、Ｃ…ポ
ーラスセラミツクス粒状物、Ｐ…植物、Ｒ…河
川、Ｗ…重量物。
FIGS. 1 and 2 are explanatory diagrams showing the usage status of the river purification treatment apparatus according to the present invention, and FIGS.
FIG. 5A, FIG. 5B, FIG. 6, and FIG. 7 are explanatory diagrams showing different structures of the weir body. 1... Weir body, 2... Fixture, 3... Angle, C... Porous ceramic granule, P... Plant, R... River, W... Heavy object.
Claims (1)
底等と接し、且つその高さを少なくとも前記河川
等の水面よりも高く設定された単数又は複数個の
綱体で枠組された水処理用の堰体と、 前記堰体内部に充てんされる、粘土を主成分と
し、これに気孔形成用材料を添加して焼成してな
るポーラス状セラミツクス粒状物と、 からなる河川等の浄化処理装置。 ２ 前記堰体が円筒状に枠組されてなる特許請求
の範囲第１項記載の河川等の浄化処理装置。 ３ 前記堰体が断面矩形状に枠組されてなる特許
請求の範囲第１項記載の河川等の浄化処理装置。 ４ 前記堰体が断面半円形状に枠組されてなる特
許請求の範囲第１項記載の河川等の浄化処理装
置。 ５ 前記堰体に対して、更にアングルを外装して
なる特許請求の範囲第１項記載の河川等の浄化処
理装置。 ６ 前記堰体の底部に、石塊、レンガ等の重量物
を内装し、該重量物の堰体上部にポーラス状セラ
ミツクス粒状物を充てんしてなる特許請求の範囲
第１項記載の河川等の浄化処理装置。[Scope of Claims] 1. One or more rope bodies installed in a position to block a waterway such as a river, in contact with the riverbed, etc., and whose height is set at least higher than the water surface of the river, etc. A river consisting of a framed weir body for water treatment, and porous ceramic granules made of clay as a main component and sintered with a pore-forming material added thereto, which is filled inside the weir body. Purification treatment equipment such as. 2. The purification device for rivers, etc. according to claim 1, wherein the weir body is framed in a cylindrical shape. 3. The apparatus for purifying a river or the like as set forth in claim 1, wherein the weir body is framed with a rectangular cross section. 4. The river purification treatment apparatus according to claim 1, wherein the weir body is framed with a semicircular cross section. 5. The river purification treatment apparatus according to claim 1, further comprising an angle mounted on the weir body. 6. A river, etc. according to claim 1, wherein a heavy object such as a stone block or brick is placed in the bottom of the weir body, and the upper part of the weir body of the heavy object is filled with porous ceramic granules. Purification treatment equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60071719A JPS61230787A (en) | 1985-04-04 | 1985-04-04 | Contact type waste water treatment apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60071719A JPS61230787A (en) | 1985-04-04 | 1985-04-04 | Contact type waste water treatment apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61230787A JPS61230787A (en) | 1986-10-15 |
| JPH0232037B2 true JPH0232037B2 (en) | 1990-07-18 |
Family
ID=13468609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60071719A Granted JPS61230787A (en) | 1985-04-04 | 1985-04-04 | Contact type waste water treatment apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61230787A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614876Y2 (en) * | 1987-04-02 | 1994-04-20 | 株式会社エスアイシ−エンジニアリング | Microbial contact material |
| JPH0630775B2 (en) * | 1987-07-28 | 1994-04-27 | 株式会社エスアイシ−エンジニアリング | Sewage purification device with contact material for microorganisms |
| JP2533297Y2 (en) * | 1990-02-28 | 1997-04-23 | 充弘 藤原 | Water purification device |
| CN106630282A (en) * | 2016-12-26 | 2017-05-10 | 航天凯天环保科技股份有限公司 | Method for treating biogas slurry in USR (up-flow solid reactor) methane tank |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681184A (en) * | 1979-12-03 | 1981-07-02 | Masato Hara | Sewage purifying filter bed utilizing kokaseki |
-
1985
- 1985-04-04 JP JP60071719A patent/JPS61230787A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681184A (en) * | 1979-12-03 | 1981-07-02 | Masato Hara | Sewage purifying filter bed utilizing kokaseki |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61230787A (en) | 1986-10-15 |
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