JPH0137197B2 - - Google Patents
Info
- Publication number
- JPH0137197B2 JPH0137197B2 JP60053729A JP5372985A JPH0137197B2 JP H0137197 B2 JPH0137197 B2 JP H0137197B2 JP 60053729 A JP60053729 A JP 60053729A JP 5372985 A JP5372985 A JP 5372985A JP H0137197 B2 JPH0137197 B2 JP H0137197B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- phosphorus
- aeration
- released
- 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.)
- Expired
Links
- 239000010802 sludge Substances 0.000 claims description 80
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 56
- 229910052698 phosphorus Inorganic materials 0.000 claims description 56
- 239000011574 phosphorus Substances 0.000 claims description 56
- 238000005273 aeration Methods 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 229920000137 polyphosphoric acid Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000009103 reabsorption Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000000852 hydrogen donor Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (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〕
この発明は有機物およびリンを含む汚水の処理
方法、特に余剰汚泥からのリンの漏出を少なくす
ることのできる汚水処理方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for treating sewage containing organic matter and phosphorus, and particularly to a method for treating sewage that can reduce leakage of phosphorus from excess sludge.
〔従来の技術〕
汚水を返送汚泥と混合して嫌気処理したのち、
曝気処理を行うと、汚水中に含まれるBODが除
去されるとともに、リンが除去されて汚泥中に濃
縮される。ところが汚泥中に濃縮されたリンは、
汚泥を嫌気性にすることにより液中へ放出され
る。このため嫌気性下に貯留した汚泥をそのまま
脱水処理すると、高濃度のリンを含む濾液が生
じ、その処理が必要になる。[Conventional technology] After mixing wastewater with returned sludge and subjecting it to anaerobic treatment,
When aeration is performed, BOD contained in wastewater is removed, as well as phosphorus, which is concentrated in sludge. However, the phosphorus concentrated in sludge
It is released into the liquid by making the sludge anaerobic. For this reason, if sludge stored under anaerobic conditions is directly dehydrated, a filtrate containing a high concentration of phosphorus will be generated, which will need to be treated.
このような点を解決するために、汚水を返送汚
泥と混合し、嫌気処理して汚泥中のリンを放出さ
せたのち、曝気処理して汚泥中にリンの摂り込み
を行い、固液分離した活性汚泥の一部を返送する
とともに、余剰汚泥を２〜18時間曝気処理して、
放出されたリンを再び摂り込んだのち、脱水処理
する方法が提案されている（特公昭59−40079
号）。 In order to solve this problem, sewage was mixed with returned sludge, treated anaerobically to release the phosphorus in the sludge, and then treated with aeration to incorporate phosphorus into the sludge, resulting in solid-liquid separation. A portion of the activated sludge is returned, and the excess sludge is aerated for 2 to 18 hours.
A method has been proposed in which the released phosphorus is re-ingested and then dehydrated (Special Publication No. 59-40079).
issue).
このような方法において、汚泥中の放出可能リ
ン量は汚泥中のポリリン酸量に相当し、通常の下
水の脱リン汚泥では２〜４％対MLSS程度である
が、その約50％以上が放出されると、再曝気処理
の時間を２〜18時間内で適当に選んでも、放出さ
れたリンのすべてを吸収することができない。こ
のため脱水までに時間がかかつたり、有機物が混
入したり、あるいは嫌気性になつたりして、放出
可能リン量の50％以上が放出されてしまうと、脱
水濾液中のリンを低くすることができず、水処理
系へ戻るリン量を少なくできないという問題点が
あつた。
In this method, the amount of releasable phosphorus in the sludge corresponds to the amount of polyphosphoric acid in the sludge, which is about 2 to 4% vs. MLSS in normal sewage dephosphorization sludge, but more than 50% of it is released. Therefore, even if the re-aeration treatment time is appropriately selected within the range of 2 to 18 hours, all of the released phosphorus cannot be absorbed. Therefore, if 50% or more of the releasable amount of phosphorus is released due to dehydration taking a long time, organic matter being mixed in, or becoming anaerobic, it is necessary to lower the phosphorus content in the dehydration filtrate. There was a problem that the amount of phosphorus returned to the water treatment system could not be reduced.
この発明は以上のような問題点を解決するため
のもので、放出可能リン量の50％以上が放出され
た場合でも、放出されたリンの大部分を再吸収
し、水処理系へ戻るリンの量を少なくし、水処理
系におけるリン除去率を高くすることができる汚
水処理方法を提案することを目的としている。 This invention is intended to solve the above-mentioned problems. Even if more than 50% of the releasable phosphorus is released, most of the released phosphorus can be reabsorbed and the phosphorus returned to the water treatment system can be reduced. The purpose of this study is to propose a wastewater treatment method that can reduce the amount of phosphorus and increase the removal rate of phosphorus in a water treatment system.
この発明は、汚水を返送汚泥と混合し嫌気処理
して汚泥中のリンを放出させたのち、曝気処理し
て汚泥中のリンの摂り込みを行い、固液分離した
活性汚泥の一部を返送するとともに、余剰汚泥に
初沈汚泥を添加し、曝気処理して放出されたリン
を再び摂り込んだのち、脱水処理することを特徴
とする汚水処理方法である。
In this invention, sewage is mixed with returned sludge, treated anaerobically to release phosphorus in the sludge, and then treated with aeration to incorporate phosphorus in the sludge, and a part of the activated sludge separated into solid and liquid is returned. At the same time, this sewage treatment method is characterized in that initial settling sludge is added to surplus sludge, phosphorus released through aeration treatment is re-ingested, and then dewatering treatment is performed.
以下図面によりこの発明を説明する。 The present invention will be explained below with reference to the drawings.
第１図はこの発明の一実施態様を示す系統図で
ある。第１図において、１は嫌気槽、２は曝気
槽、３は沈殿槽、４は貯留槽、５は汚泥曝気槽、
６は脱水機である。 FIG. 1 is a system diagram showing one embodiment of the present invention. In Figure 1, 1 is an anaerobic tank, 2 is an aeration tank, 3 is a settling tank, 4 is a storage tank, 5 is a sludge aeration tank,
6 is a dehydrator.
処理法は、原水７と返送汚泥８を嫌気槽１に導
入して混合し、30分〜４時間緩やかに攬拌しなが
ら嫌気性下に保つと、汚泥中に蓄えられたリンを
エネルギー源として原水中のBODが汚泥に摂り
入れられ、リンが放出される。また返送汚泥中に
混入する硝酸性たは亜硝酸性の窒素NO3 -、
NO2 -は原水のBODを水素供与体として汚泥によ
り脱窒される。 The treatment method is to introduce raw water 7 and return sludge 8 into an anaerobic tank 1, mix them, and keep the mixture under anaerobic conditions with gentle stirring for 30 minutes to 4 hours.Then, the phosphorus stored in the sludge is used as an energy source. BOD in raw water is taken up by sludge and phosphorus is released. In addition, nitrate or nitrite nitrogen NO 3 - mixed in the returned sludge,
NO 2 - is denitrified by sludge using BOD of raw water as a hydrogen donor.
このようにして嫌気処理した液を曝気槽２に導
入して通気し、60分〜12時間曝気処理を行うと、
通常の呼吸によりBODが酸化され、放出したリ
ンや流入したリンが汚泥中に摂り入れられ、エネ
ルギー源として汚泥の体内に蓄えられる。また液
中のアンモニア性窒素は硝酸性または亜硝酸性窒
素に酸化される。 When the anaerobically treated liquid is introduced into the aeration tank 2, aerated, and aerated for 60 minutes to 12 hours,
BOD is oxidized through normal respiration, and the released phosphorus and inflow phosphorus are taken into the sludge and stored within the sludge as an energy source. Also, ammonia nitrogen in the liquid is oxidized to nitrate or nitrite nitrogen.
曝気処理を終つた液を沈殿槽３において固液分
離を行い、上澄水を処理水９として放流する一
方、分離した活性汚泥10の一部を返送汚泥８とし
て嫌気槽１へ返送し、残余の余剰汚泥１１を脱水
処理する。 The aerated liquid is subjected to solid-liquid separation in the settling tank 3, and the supernatant water is discharged as treated water 9, while a part of the separated activated sludge 10 is returned to the anaerobic tank 1 as return sludge 8, and the remaining Excess sludge 11 is dehydrated.
余剰汚泥１１は貯留槽４で貯留した後、汚泥曝
気槽５において曝気処理するが、このとき汚泥曝
気槽５に初沈汚泥１２を添加して余剰汚泥と混合
し曝気を行う。初沈汚泥１２は汚泥曝気の際の
BOD源となるもので、嫌気槽１の前に設置され
る最初沈殿槽から排出される汚泥である。添加す
る初沈汚泥は多いほど良いが、少ない場合でもそ
れなりの効果はある。 After the surplus sludge 11 is stored in the storage tank 4, it is aerated in the sludge aeration tank 5. At this time, the initial settling sludge 12 is added to the sludge aeration tank 5, mixed with the surplus sludge, and aerated. Initial settling sludge 12 is the result of sludge aeration.
This is the BOD source and is the sludge discharged from the initial settling tank installed before the anaerobic tank 1. The more initial settling sludge added, the better, but even if it is small, it will still have some effect.
生物脱リン法では、液中のリンを微生物が菌体
内に摂取し、ポリリン酸を合成するため、その際
エネルギ源が必要である。ポリリン酸の50％程度
が放出され、それを再摂取し、再びポリリン酸を
合成する程度のエネルギは菌体内に予め貯蔵して
いるポリベータヒドロキシブチレン等の貯蔵有機
物によつてまかなわれると推定される。 In the biological dephosphorization method, microorganisms ingest phosphorus in the liquid into their cells and synthesize polyphosphoric acid, which requires an energy source. It is estimated that about 50% of polyphosphoric acid is released, and the energy required to re-uptake it and synthesize polyphosphoric acid again is provided by stored organic substances such as polybeta-hydroxybutylene stored in advance within the bacterial body. Ru.
ところが放出リン量が50％を越えると、多くの
場合ポリリン酸を再び合成するためのエネルギ源
が不足するため、不足分は外部から添加する必要
がある。初沈汚泥１２は微生物が放出されたリン
を吸収してポリリン酸を合成するためのエネルギ
源として作用するものと推定される。 However, when the amount of released phosphorus exceeds 50%, there is often a shortage of energy sources to resynthesize polyphosphoric acid, so it is necessary to add the missing amount from the outside. It is presumed that the initial settling sludge 12 acts as an energy source for microorganisms to absorb released phosphorus and synthesize polyphosphoric acid.
貯留槽４で放出可能リン量の50％以上を放出し
た余剰汚泥は汚泥曝気槽５において初沈汚泥１２
を添加して曝気すると、放出されたリンの大部分
が再び吸収される。汚泥曝気槽５における曝気時
間は２時間以上、好ましくは３時間以上、特に好
ましくは５時間以上であり、７時間でほぼ完全に
リンが吸収され、それ以上曝気しても効果の改善
はないが、26時間程度までは曝気可能である。そ
れより長い曝気は吸収されたリンを再び放出させ
るので好ましくない。 Excess sludge that has released 50% or more of the releasable phosphorus amount in the storage tank 4 is sent to the sludge aeration tank 5 as primary settling sludge 12.
When added with aeration, most of the released phosphorus is reabsorbed. The aeration time in the sludge aeration tank 5 is 2 hours or more, preferably 3 hours or more, particularly preferably 5 hours or more. Phosphorus is almost completely absorbed in 7 hours, and further aeration will not improve the effect. , it is possible to aerate for up to about 26 hours. Longer aeration is undesirable since it causes the absorbed phosphorus to be released again.
汚泥曝気槽５でリンを吸収した汚泥は脱水機６
で脱水処理し、汚泥ケーキ１３は排出し、分離液
１４は嫌気槽１または曝気槽２に返送し、再び処
理を行う。このとき分離液１４に含まれるリンの
量は少ないので、水処理系へ戻るリンの量は少な
く、水処理系におけるリン除去率が高くなる。 The sludge that has absorbed phosphorus in the sludge aeration tank 5 is sent to the dehydrator 6
The sludge cake 13 is discharged, and the separated liquid 14 is returned to the anaerobic tank 1 or the aeration tank 2 and processed again. At this time, since the amount of phosphorus contained in the separated liquid 14 is small, the amount of phosphorus returned to the water treatment system is small, and the phosphorus removal rate in the water treatment system is increased.
以上の処理において、曝気槽２における曝気処
理としては、活性汚泥処理のほか、硝化脱窒処理
その他の好気性生物処理を行つてもよい。また貯
留槽４は嫌気性下に余剰汚泥を貯留するものでよ
いが、必要により曝気を行つてもよい。 In the above treatment, as the aeration treatment in the aeration tank 2, in addition to activated sludge treatment, nitrification and denitrification treatment and other aerobic biological treatment may be performed. The storage tank 4 may store excess sludge under anaerobic conditions, but may be aerated if necessary.
余剰汚泥としてはリン放出率50％以上のものが
好ましいが、50％未満のものでもよい。初沈汚泥
１２は汚泥曝気槽５に直接添加しないで、さらに
前の段階で添加してもよいが、添加後曝気までの
時間が長いと大部分のリンが放出されて好ましく
ないため、汚泥曝気槽５またはその直前で添加す
るのが好ましい。脱水機６としてはベルトプレス
型脱水機その他公知のものが使用できる。 The surplus sludge preferably has a phosphorus release rate of 50% or more, but may have a phosphorus release rate of less than 50%. The initial settling sludge 12 may not be added directly to the sludge aeration tank 5, but may be added at an earlier stage, but if the time after addition until aeration is long, most of the phosphorus will be released, which is undesirable. It is preferable to add it at or just before tank 5. As the dehydrator 6, a belt press type dehydrator or other known dehydrator can be used.
以下、実施例について説明する。 Examples will be described below.
BOD120mg／、全P5mg／の下水を第１図の
方法により処理した。まず返送汚泥率50％（対流
入原水）で原水７と返送汚泥８を嫌気槽１に導入
して1.5時間の滞留時間で嫌気性下に攬拌して嫌
気処理し、次いで曝気槽２において、３時間曝気
処理した。曝気槽２における溶存酸素は３〜５
mg／、MLSSは2000mg／であつた。混合液を
沈殿槽３において2.5時間滞留させて固液分離を
したところ、処理水BODは５mg／、全Ｐは0.4
〜0.5mg／であり、余剰汚泥のSSは5800mg／
であつた。 Sewage with 120 mg of BOD and 5 mg of total P was treated by the method shown in Figure 1. First, raw water 7 and return sludge 8 are introduced into the anaerobic tank 1 with a return sludge ratio of 50% (relative to inflow raw water), and are anaerobically stirred for a residence time of 1.5 hours for anaerobic treatment, then in the aeration tank 2, Aeration treatment was performed for 3 hours. Dissolved oxygen in aeration tank 2 is 3-5
mg/, MLSS was 2000 mg/. When the mixed liquid was allowed to stay in settling tank 3 for 2.5 hours and separated into solid and liquid, the BOD of the treated water was 5 mg/, and the total P was 0.4.
~0.5mg/, and the SS of surplus sludge is 5800mg/
It was hot.
上記余剰汚泥をメスシリンダにとり、嫌気性下
に緩やかに攬拌して汚泥からリンを放出させ、そ
の放出量(A)を調べるとともに、６時間半後(B)、10
時間後(C)、25時間後(D)、93時間後(E)にそれぞれ混
合液を採つて曝気し、リンの吸収を調べた結果を
第２図のグラフに示す。 The excess sludge was taken into a graduated cylinder and gently stirred under anaerobic conditions to release phosphorus from the sludge.
After hours (C), 25 hours (D), and 93 hours (E), the mixture was sampled and aerated, and the absorption of phosphorus was examined. The results are shown in the graph of FIG.
第２図の結果より、ＢおよびＣではリンの放出
率は27％および47％で、それらは曝気により100
％再吸収されているが、ＤおよびＥではリンの放
出率は75％および100％で、再吸収率は96％およ
び86％となり、完全に再吸収できないことがわか
る。 From the results in Figure 2, the phosphorus release rates in B and C are 27% and 47%, and they are 100% higher due to aeration.
However, in D and E, the phosphorus release rate is 75% and 100%, and the reabsorption rate is 96% and 86%, indicating that it cannot be completely reabsorbed.
次に貯留槽４で嫌気的に100時間貯留した余剰
汚泥（MLSS5020mg／、リン放出率約100％）
を単独で曝気した場合(F)、および上記余剰汚泥と
初沈汚泥（SS9200mg／）を１：１（容量比）で
混合して曝気した場合(G)について、液中のリン濃
度の変化を調べた結果を第３図のグラフに示す。 Next, surplus sludge was stored anaerobically in storage tank 4 for 100 hours (MLSS 5020mg/, phosphorus release rate approximately 100%)
Changes in the phosphorus concentration in the liquid are calculated for the case (F) where the above surplus sludge and initial settling sludge (SS9200mg/) are mixed at a ratio of 1:1 (volume ratio) and aerated (G). The results of the investigation are shown in the graph of Figure 3.
第３図の結果により、Ｆではリンの再吸収率は
86％であるのに対し、Ｇでは100％であり、初沈
汚泥添加により放出したリンを完全に再吸収でき
ることがわかる。 According to the results shown in Figure 3, the reabsorption rate of phosphorus is
While it is 86%, it is 100% in G, which shows that the phosphorus released by adding initial settling sludge can be completely reabsorbed.
本発明によれば、余剰汚泥に初沈汚泥を添加し
て曝気するようにしたので、放出可能リン量の50
％以上が放出された場合でも、放出されたリン量
の大部分を再吸収でき、水処理系へ戻るリンの量
を少なくし、水処理系におけるリン除去率を高く
することができる。
According to the present invention, since initial settling sludge is added to surplus sludge and aeration is performed, 50% of the amount of releasable phosphorus is
% or more, most of the released phosphorus can be reabsorbed, reducing the amount of phosphorus returned to the water treatment system and increasing the phosphorus removal rate in the water treatment system.
また余剰汚泥に添加する初沈汚泥は高濃度の有
機物を含むため、少量の添加で効率よくリンの再
吸収を行うことができるとともに、別途処理すべ
き初沈汚泥をこの段階で処理できるので、全体と
して効率のよい処理を行うことができる。 In addition, since the initial settling sludge added to surplus sludge contains a high concentration of organic matter, it is possible to efficiently reabsorb phosphorus with a small amount of addition, and the initial settling sludge that should be treated separately can be treated at this stage. Overall, efficient processing can be performed.
第１図はこの発明の実施態様を示す系統図、第
２図および第３図は実施例における結果を示すグ
ラフである。
１：嫌気槽、２：曝気槽、３：沈殿槽、４：貯
留槽、５：汚泥曝気槽、６：脱水機。
FIG. 1 is a system diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are graphs showing results in the example. 1: Anaerobic tank, 2: Aeration tank, 3: Sedimentation tank, 4: Storage tank, 5: Sludge aeration tank, 6: Dehydrator.
Claims (1)
のリンを放出させたのち、曝気処理して汚泥中に
リンの摂り込みを行い、固液分離した活性汚泥の
一部を返送するとともに、余剰汚泥に初沈汚泥を
添加し、曝気処理して放出されたリンを再び摂り
込んだのち、脱水処理することを特徴とする汚水
処理方法。 ２ 余剰汚泥の曝気処理が放出可能なリンの50％
以上を放出した余剰汚泥について行うものである
特許請求の範囲第１項記載の汚水処理方法。 ３ 初沈汚泥の添加が汚泥曝気槽またはその直前
で行うものである特許請求の範囲第１項または第
２項記載の汚水処理方法。[Scope of Claims] 1. Sewage is mixed with returned sludge, treated anaerobically to release phosphorus in the sludge, and then subjected to aeration treatment to incorporate phosphorus into the sludge, resulting in solid-liquid separation of the activated sludge. This sewage treatment method is characterized by returning the sludge, adding primary settling sludge to surplus sludge, re-ingesting the phosphorus released through aeration treatment, and then dewatering the sludge. 2. 50% of the phosphorus that can be released by aeration treatment of surplus sludge
The sewage treatment method according to claim 1, which is carried out on surplus sludge discharged. 3. The sewage treatment method according to claim 1 or 2, wherein the addition of the initial settling sludge is carried out in or immediately before the sludge aeration tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5372985A JPS61212396A (en) | 1985-03-18 | 1985-03-18 | Treatment of sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5372985A JPS61212396A (en) | 1985-03-18 | 1985-03-18 | Treatment of sewage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61212396A JPS61212396A (en) | 1986-09-20 |
| JPH0137197B2 true JPH0137197B2 (en) | 1989-08-04 |
Family
ID=12950916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5372985A Granted JPS61212396A (en) | 1985-03-18 | 1985-03-18 | Treatment of sewage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61212396A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4528175B2 (en) * | 2005-03-22 | 2010-08-18 | メタウォーター株式会社 | Treatment method of organic sludge |
| JP2013119081A (en) * | 2011-12-09 | 2013-06-17 | Kobelco Eco-Solutions Co Ltd | Treatment method and treatment apparatus for phosphorus-containing wastewater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940079A (en) * | 1982-08-31 | 1984-03-05 | 横浜ゴム株式会社 | High-pressure hose |
-
1985
- 1985-03-18 JP JP5372985A patent/JPS61212396A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940079A (en) * | 1982-08-31 | 1984-03-05 | 横浜ゴム株式会社 | High-pressure hose |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61212396A (en) | 1986-09-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |