JPH038496A - Treatment of septic tank sludge - Google Patents
Treatment of septic tank sludgeInfo
- Publication number
- JPH038496A JPH038496A JP4115690A JP4115690A JPH038496A JP H038496 A JPH038496 A JP H038496A JP 4115690 A JP4115690 A JP 4115690A JP 4115690 A JP4115690 A JP 4115690A JP H038496 A JPH038496 A JP H038496A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- septic tank
- separated
- treatment
- 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.)
- Granted
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 95
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 230000002378 acidificating effect Effects 0.000 claims abstract description 5
- 230000000717 retained effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000012528 membrane Substances 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 abstract description 2
- 230000003381 solubilizing effect Effects 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005063 solubilization Methods 0.000 description 12
- 230000007928 solubilization Effects 0.000 description 12
- 238000003756 stirring Methods 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000010800 human waste Substances 0.000 description 3
- 229920006317 cationic polymer Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、浄化槽より排出される浄化槽汚泥の新規な処
理方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel method for treating septic tank sludge discharged from a septic tank.
従来、し尿単独浄化槽及び合併浄化槽から排出される浄
化槽汚泥は、し尿処理施設で処理しなければならないこ
とが、法律（浄化槽法）できまっているが、近年の浄化
槽汚泥の発生量の急増につれ、し尿処理施設だけでは対
応しきれず、浄化槽汚泥専用処理施設が建設される例が
多くなっている。Traditionally, the law (septic tank law) stipulates that septic tank sludge discharged from human waste-only septic tanks and combined septic tanks must be treated at a human waste treatment facility, but as the amount of septic tank sludge generated has increased rapidly in recent years, human waste Treatment facilities alone cannot cope with the problem, and in many cases, treatment facilities exclusively for septic tank sludge are being constructed.
従来の浄化槽汚泥専用処理方式は、搬入された浄化槽汚
泥を濃縮脱水あるいは直接、脱水機で脱水したのち、分
離液を活性汚泥処理するというものであった。The conventional treatment system exclusively for septic tank sludge involves concentrating and dehydrating imported septic tank sludge or directly dewatering it in a dehydrator, and then subjecting the separated liquid to activated sludge treatment.
しかしながら、上記の処理方法は、浄化槽汚泥の脱水ケ
ーキの発生量が極めて多量であり、脱水ケーキの乾燥、
焼却設備の建設費、運転費が高額であり、また、乾燥、
焼却しない場合も、埋立てすべき量が非常に多く、埋立
地の寿命が短くなり、また輸送コストがかさむという欠
点があった。However, the above treatment method generates an extremely large amount of dehydrated cake of septic tank sludge, and
The construction and operating costs of incineration equipment are high, and drying and
Even when the waste is not incinerated, there are disadvantages in that the amount to be landfilled is very large, the life of the landfill is shortened, and transportation costs are high.
そこで、本発明の目的は、上記のような問題点を解消し
、浄化槽汚泥処理に伴って発生する汚泥の脱水ケーキ量
を大幅に減少させて、脱水機、乾燥焼却設備の建設費、
スペース及び運転経費を大きく節減することが可能な新
規な処理方法を提供することにある。SUMMARY OF THE INVENTION Therefore, the purpose of the present invention is to solve the above-mentioned problems, to significantly reduce the amount of dewatered sludge cake generated in septic tank sludge treatment, and to reduce the construction costs of dehydrators and drying and incineration equipment.
The object of the present invention is to provide a new processing method that allows for significant savings in space and operating costs.
上記目的を達成するために、本発明では、浄化槽汚泥を
濃縮したのち、該濃縮汚泥を、アルカリ又は鉱酸を添加
してアルカリ性条件下又は酸性条件下で加温滞留せしめ
たのち、前記汚泥濃縮工程からの分離水とともに、好気
性生物処理工程に供給して生物処理することを特徴とす
る浄化槽汚泥の処理方法としたものである。In order to achieve the above object, in the present invention, after concentrating septic tank sludge, the concentrated sludge is heated and retained under alkaline or acidic conditions by adding alkali or mineral acid, and then the sludge is concentrated. This is a method for treating septic tank sludge, which is characterized by supplying separated water from the process to an aerobic biological treatment process for biological treatment.
そして、上記の浄化槽汚泥の処理方法において、アルカ
リ又は酸を添加する加温滞留工程に、好気性生物処理工
程に後続する固液分離工程で分離した汚泥の一部を供給
することができる。In the above method for treating septic tank sludge, a part of the sludge separated in the solid-liquid separation step subsequent to the aerobic biological treatment step can be supplied to the heating retention step in which an alkali or acid is added.
上記のアルカリ性条件としてはｐＨ１０以上、特に１２
以上が好ましく、また酸性条件としてはｐ）１３以下、
特に２以下が好ましい。The above alkaline conditions include a pH of 10 or higher, especially 12
The above is preferable, and the acidic conditions are p) 13 or less,
In particular, 2 or less is preferable.
次に、本発明を第１図を参照しながらより詳しく説明す
る。第１図は、本発明の処理方法の一実施態様を示す工
程図である。Next, the present invention will be explained in more detail with reference to FIG. FIG. 1 is a process diagram showing one embodiment of the treatment method of the present invention.
浄化槽汚泥処理施設に搬入される浄化槽汚泥ｌを沈殿槽
、加圧浮上、遠心濃縮機などによる汚泥ａ縮工程２（図
示例は沈殿槽）において濃縮する。この際汚泥の濃縮を
促進するため、カチオンポリマなどの凝集剤２１を添加
してもよい。The septic tank sludge carried into the septic tank sludge treatment facility is concentrated in a sludge a reduction process 2 (the illustrated example is a settling tank) using a settling tank, pressurized flotation, centrifugal thickener, etc. At this time, a flocculant 21 such as a cationic polymer may be added to promote the concentration of sludge.
しかして、濃縮された浄化槽汚泥（以下濃縮汚泥と記す
）３の一部を分岐して、汚泥可溶化槽５に供給し、Ｎａ
ＯＨなどのアリカリ剤または）ＩＣ１などの強酸６を添
加し、ヒーター７で加温しながら、所定時間攪拌滞留さ
せる。この結果、汚泥ＳＳが可溶化し微生物が資化可能
なりＯＤに変わる。アルカリ剤の添加量は、汚泥可溶化
槽５のｐＨが１０以上、特に１２以上になるように設定
するのが良く、また、酸の場合は可溶化槽５のｐＨが３
以下、特に２以下になるように酸を注入すると、汚泥３
が可溶化しやすくなる。Thus, a part of the concentrated septic tank sludge (hereinafter referred to as concentrated sludge) 3 is branched and supplied to the sludge solubilization tank 5, and Na
An alkali agent such as OH or a strong acid 6 such as IC1 is added, and while heating with a heater 7, the mixture is stirred and retained for a predetermined time. As a result, the sludge SS becomes solubilized, becomes assimilated by microorganisms, and turns into OD. The amount of alkaline agent added is preferably set so that the pH of the sludge solubilization tank 5 is 10 or more, especially 12 or more, and in the case of acid, the pH of the solubilization tank 5 is 3 or more.
Below, if acid is injected so that the concentration is particularly 2 or less, sludge 3
becomes easier to solubilize.
また、汚泥可溶化槽５の温度を５０℃以上、好ましくは
８０〜１００℃とすると、さらに汚泥の可溶化が促進さ
れる。なお−可溶化槽５の滞留時間は、汚泥の性状に応
じて、あらかじめ実験し、決定することができるが、通
常は、５〜４８ｈｒ程度の範囲で、充分な可溶化が進行
する。Further, when the temperature of the sludge solubilization tank 5 is set to 50°C or higher, preferably 80 to 100°C, solubilization of the sludge is further promoted. Although the residence time in the solubilization tank 5 can be determined in advance through experiments depending on the properties of the sludge, sufficient solubilization usually proceeds within a range of about 5 to 48 hours.
しかして、可溶化種流出汚泥８を、前記の汚泥濃縮工程
での分離液９とともに、生物処理槽１０（通常の活性汚
泥法、生物学的硝化脱窒法などが適用される）に供給し
、分離液９および可溶化汚泥８中に含まれるＢＯＤ成分
を充分生物学的に除去する。１１は曝気装置である。な
お、もちろん、除渣し尿を、この生物処理槽１０に供給
して、合併処理することも、可能である。Then, the solubilized species effluent sludge 8 is supplied to a biological treatment tank 10 (to which a normal activated sludge method, biological nitrification and denitrification method, etc. are applied) together with the separated liquid 9 from the sludge concentration step, BOD components contained in the separated liquid 9 and the solubilized sludge 8 are sufficiently biologically removed. 11 is an aeration device. Of course, it is also possible to supply the filtered human urine to this biological treatment tank 10 and perform combined treatment.
生物処理槽１０から流出する活性汚泥スラリは、ＯＦ膜
などの任意の固液分離工程１２で固液分離され、清澄処
理水１３と分離汚泥１４とになる。The activated sludge slurry flowing out from the biological treatment tank 10 is separated into solid and liquid in an arbitrary solid-liquid separation process 12 such as an OF membrane, and becomes clarified treated water 13 and separated sludge 14.
分離汚泥１４の大部分１５は、生物処理槽１０に返送さ
れ、余剰汚泥相当量１６が、汚泥濃縮工程２の前に供給
される。なお、余剰汚泥１６の童を、さらに減少させる
には、分離汚泥１４の一部１７を汚泥可溶化槽５にリサ
イクルさせるのが好ましい。The majority 15 of the separated sludge 14 is returned to the biological treatment tank 10, and an amount equivalent to surplus sludge 16 is supplied before the sludge concentration step 2. In addition, in order to further reduce the amount of excess sludge 16, it is preferable to recycle a portion 17 of the separated sludge 14 to the sludge solubilization tank 5.
一方濃縮汚泥３の他部３′は、汚泥可溶化槽４に供給せ
ずに、そのまま、汚泥脱水工程（遠心脱水、ベルトプレ
ス、スクリュープレス、フィルタプレスから選ばれる）
１８に供給し、脱水ケーキ１９と脱水分離液２０に分
離する。脱水分離液２０は、生物処理槽１０に供給して
、処理する。On the other hand, the other part 3' of the thickened sludge 3 is not supplied to the sludge solubilization tank 4, but is directly subjected to a sludge dewatering process (selected from centrifugal dewatering, belt press, screw press, and filter press).
18 and separated into a dehydrated cake 19 and a dehydrated separated liquid 20. The dehydrated separated liquid 20 is supplied to the biological treatment tank 10 for treatment.
以上述べたように、本発明によれば、浄化槽汚泥に、ア
ルカリ又は酸を添加し、加温滞留させることによって、
浄化槽汚泥中の８８分を可溶化して、微生物が資化でき
るＢＯＤに変換せしめ、このＢＯＤを生物処理工程でＣ
Ｏ□と８２０に分解させることができる。As described above, according to the present invention, by adding alkali or acid to septic tank sludge and allowing it to stay heated,
The 88% in septic tank sludge is solubilized and converted into BOD that can be assimilated by microorganisms, and this BOD is converted to carbon in the biological treatment process.
It can be decomposed into O□ and 820.
以下、本発明の実施例を記載するが、本発明はこの実施
例に限定されるものではない。Examples of the present invention will be described below, but the present invention is not limited to these Examples.
実施例１ 第１図の工程図に従って、本発明の実証実験を行った。Example 1 A demonstration experiment of the present invention was conducted according to the process diagram shown in FIG.
Ｓ Ｓ １５０００ ｍｇ／ ｉ 、 Ｂ ＯＤ ６０
００ｍｇ／ ｆ！の浄化槽汚泥に、カチオンポリマー（
エバグロースＣ１０４Ｇ）を５０ｍｇ／Ａ添加し、２４
ｈｒ沈降濃縮した結果、汚泥濃度２．８％の濃縮汚泥を
得た。SS 15000 mg/i, BOD 60
00mg/f! A cationic polymer (
Added 50mg/A of Evagrowth C104G), 24
As a result of hr sedimentation and concentration, thickened sludge with a sludge concentration of 2.8% was obtained.
この濃縮汚泥の７割を分取し、ＮａＯＨを添加して、ｐ
Ｈ１３，０、温度９０℃に加温しつつ、４８ｈｒ攪拌し
ながら滞留せしめた結果、汚泥ＳＳの７０〜７５％が可
溶化し、液状化した。70% of this thickened sludge is separated, NaOH is added, and p
As a result of heating the sludge to a temperature of 90° C. and retaining it with stirring for 48 hours, 70 to 75% of the sludge SS was solubilized and liquefied.
一方、ＨＣＩを添加して、ｐＨ１，５にし、温度９０℃
に加温しつつ、４８ｈｒ攪拌しながら滞留せしめた結果
、汚泥ＳＳの６０〜６３％が可溶化した。次に、ＮａＯ
Ｈで可溶化させた汚泥と、沈殿濃縮工程の上澄水の両者
を、滞留時間５日、ＭＬＳ３５０００ｍｇ／ｊｌ！の活
性汚泥曝気槽に供給して生物処理したのち、限外濾過膜
で固液分離したところ、ＳＳは０、Ｂ ＯＤ １０〜２
５ｍｇ／ Ｒの清澄処理水を得た。生物処理槽から発生
する余剰汚泥量は、浄化槽汚泥処理量１ｍ°／日当り、
０．８〜１．２ｋｇ５ｓ／日であった。Meanwhile, HCI was added to adjust the pH to 1.5, and the temperature was 90°C.
As a result, 60 to 63% of the sludge SS was solubilized as a result of being allowed to stagnate while stirring for 48 hours. Next, NaO
Both the sludge solubilized with H and the supernatant water from the precipitation/concentration process were collected at a residence time of 5 days and an MLS of 35,000 mg/jl! After biological treatment by supplying the activated sludge to an aeration tank, solid-liquid separation was performed using an ultrafiltration membrane, SS was 0, and BOD was 10-2.
Clear treated water of 5 mg/R was obtained. The amount of excess sludge generated from the biological treatment tank is the amount of septic tank sludge treated per 1 m°/day,
It was 0.8-1.2kg5s/day.
第２図に、浄化槽汚泥の濃縮汚泥をアルカリ性加熱処理
したときのｐＨと余剰汚泥発生量の関係を示す。加熱温
度は９０℃、攪拌時間は４８ｈ「一定とした。FIG. 2 shows the relationship between the pH and the amount of surplus sludge generated when concentrated sludge of septic tank sludge is subjected to alkaline heat treatment. The heating temperature was kept constant at 90° C. and the stirring time was kept constant for 48 hours.
第２図から、ｐＨ１０以上が効果的なことが判る。From FIG. 2, it can be seen that a pH of 10 or higher is effective.
一方、ＨＣＩで可溶化した汚泥と沈殿濃縮工程上澄水の
両者を前記と同一条件の生物処理槽に供給して、生物処
理したところ限外濾過膜分離水の水質はＳＳ Ｏｍｇ
／１１ＢＯＤ ８〜１５ｍｇ／ｌであり、余剰汚泥発
生量は、浄化槽汚泥処理量１ ｍ” ／日当り、１ 、
４〜１．８ｋｇ ｓｓ／日であった。On the other hand, when both the sludge solubilized with HCI and the supernatant water from the precipitation concentration process were supplied to a biological treatment tank under the same conditions as above and subjected to biological treatment, the water quality of the ultrafiltration membrane separated water was SS Omg.
/11 BOD 8 to 15 mg/l, and the amount of surplus sludge generated is septic tank sludge processing amount 1 m"/day, 1,
It was 4 to 1.8 kg ss/day.
第３ｒ５Ａに、浄化槽汚泥の濃縮汚泥を酸性で加熱した
ときのｐｌ（と余剰汚泥発生量の関係を示す。Part 3r5A shows the relationship between pl (when concentrated sludge of septic tank sludge is heated in an acidic environment and the amount of surplus sludge generated).
加熱温度は９０℃、攪拌時間は４８ｈｒ一定とした。The heating temperature was constant at 90° C. and the stirring time was constant at 48 hours.
第３図から酸処理ｐＨは３以上が効果的であることが認
められる。From FIG. 3, it is recognized that acid treatment pH of 3 or more is effective.
この結果、汚泥脱水工程に供給される汚泥の固形物量は
ＮａＯＨによる可溶化の場合５．３〜５．７ｋｇ５ｓ／
ｍ’浄化槽汚泥、ＨＣＩによる可溶化の場合、５．９〜
６ 、３ｋｇ ｓｓ／ ｍ”・浄化槽汚泥となった。As a result, the amount of solid matter in the sludge supplied to the sludge dewatering process is 5.3 to 5.7 kg5s/in the case of solubilization with NaOH.
m' Septic tank sludge, in the case of solubilization by HCI, 5.9 ~
6.3kg ss/m” septic tank sludge.
一方、本発明によらず、従来方式のように、濃縮汚泥の
全量を汚泥脱水工程に供給して処理した場合の、脱水工
程への流入固形物置は１６〜１６ 、５ｋｇ ｓｓ／
ｍ’・浄化槽であり、本発明に比べ、約２．６倍も多量
であり、脱水ケーキ発生量は約２．８倍となった。On the other hand, when the entire amount of thickened sludge is supplied to the sludge dewatering process and treated as in the conventional method without using the present invention, the amount of solids flowing into the dewatering process is 16 to 16,5 kg ss/
The amount of dehydrated cake generated was approximately 2.8 times that of the present invention.
〔発明の効果〕 本発明によれば、次のような効果を生ずる。〔Effect of the invention〕 According to the present invention, the following effects are produced.
■ 浄化槽汚泥の脱水ケーキ発生量が、従来方式の約１
／３に減少する。この結果、汚泥脱水機の設備費、運転
経費が大きく低減する。■ The amount of dehydrated cake generated from septic tank sludge is approximately 1
/3. As a result, equipment costs and operating costs for the sludge dewatering machine are significantly reduced.
■ 脱水ケーキを埋立て処分する場合、ケーキの輸送コ
ストが安く、また、埋立て量が少いため、埋立地の寿命
が延びる。■ When disposing of dehydrated cake in a landfill, the cost of transporting the cake is low, and the amount of waste to be landfilled is small, extending the life of the landfill.
■ 脱水ケーキを乾燥あるいは焼却する場合も、乾燥、
焼却設備の設備費、スペース、運転経費が大きく低減す
る。また、燃却灰の発生量も減少するので、処分が容易
になる。■ When drying or incinerating dehydrated cake,
Equipment costs, space, and operating costs for incineration equipment are greatly reduced. Additionally, the amount of combustion ash generated is reduced, making disposal easier.
第１図は、本発明の処理方法の１例を示す工程図であり
、第２図及び第３図は、ｐＨと余剰汚泥発生量の関係を
示すグラフである。
１・・・浄化槽汚泥、２・・・沈殿槽、３・・・濃縮汚
泥、５・・・汚泥可溶化槽、６・・・薬剤添加、７・・
・ヒーター、８・・・流出汚泥、９・・・分離液、１０
・・・生物処理槽、１１・・・曝気装置、１２−・・固
液分離工程、１３・・・清澄処理水、１４・・・分離汚
泥、１８−・・汚泥脱水工程、１９・・・脱水ケーキ、FIG. 1 is a process diagram showing an example of the treatment method of the present invention, and FIGS. 2 and 3 are graphs showing the relationship between pH and the amount of excess sludge generated. 1... Septic tank sludge, 2... Sedimentation tank, 3... Thickened sludge, 5... Sludge solubilization tank, 6... Chemical addition, 7...
・Heater, 8... Effluent sludge, 9... Separated liquid, 10
... Biological treatment tank, 11 ... Aeration device, 12 - Solid-liquid separation process, 13 - Clear treated water, 14 - Separated sludge, 18 - Sludge dewatering process, 19... dehydrated cake,
Claims (1)
リ又は鉱酸を添加してアルカリ性条件下又は酸性条件下
で加温滞留せしめたのち、前記汚泥濃縮工程からの分離
水とともに、好気性生物処理工程に供給して生物処理す
ることを特徴とする浄化槽汚泥の処理方法。２、前記ア
ルカリ又は酸を添加する加温滞留工程に、前記好気性生
物処理工程に後続する固液分離工程で分離した汚泥の一
部を供給することを特徴とする請求項１記載の浄化槽汚
泥の処理方法。1. After concentrating the septic tank sludge, alkali or mineral acid is added to the concentrated sludge and the concentrated sludge is heated and retained under alkaline or acidic conditions. A method for treating septic tank sludge, characterized by supplying it to a treatment process and subjecting it to biological treatment. 2. The septic tank sludge according to claim 1, wherein a part of the sludge separated in the solid-liquid separation step subsequent to the aerobic biological treatment step is supplied to the heating retention step in which the alkali or acid is added. processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2041156A JPH0632836B2 (en) | 1989-03-20 | 1990-02-23 | Treatment method of septic tank sludge |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6598589 | 1989-03-20 | ||
| JP1-65985 | 1989-03-20 | ||
| JP2041156A JPH0632836B2 (en) | 1989-03-20 | 1990-02-23 | Treatment method of septic tank sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH038496A true JPH038496A (en) | 1991-01-16 |
| JPH0632836B2 JPH0632836B2 (en) | 1994-05-02 |
Family
ID=26380717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2041156A Expired - Fee Related JPH0632836B2 (en) | 1989-03-20 | 1990-02-23 | Treatment method of septic tank sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632836B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6570086B1 (en) | 2000-06-06 | 2003-05-27 | Mitsubishi Denki Kabushiki Kaisha | Cooling structure of communication device |
| JP2008170477A (en) * | 2007-01-05 | 2008-07-24 | Yamaha Corp | Electronic keyboard instrument exterior structure |
| JP2019198804A (en) * | 2018-05-14 | 2019-11-21 | 株式会社神鋼環境ソリューション | Waste water treatment method, and waste water treatment device |
| US12343410B2 (en) | 2019-10-24 | 2025-07-01 | The Procter & Gamble Company | Multilayer dissolvable solid article containing coating composition and process for making the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4911813A (en) * | 1972-04-12 | 1974-02-01 | ||
| JPS5936597A (en) * | 1982-08-26 | 1984-02-28 | Mitsubishi Kakoki Kaisha Ltd | Treatment of night soil |
-
1990
- 1990-02-23 JP JP2041156A patent/JPH0632836B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4911813A (en) * | 1972-04-12 | 1974-02-01 | ||
| JPS5936597A (en) * | 1982-08-26 | 1984-02-28 | Mitsubishi Kakoki Kaisha Ltd | Treatment of night soil |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6570086B1 (en) | 2000-06-06 | 2003-05-27 | Mitsubishi Denki Kabushiki Kaisha | Cooling structure of communication device |
| JP2008170477A (en) * | 2007-01-05 | 2008-07-24 | Yamaha Corp | Electronic keyboard instrument exterior structure |
| JP2019198804A (en) * | 2018-05-14 | 2019-11-21 | 株式会社神鋼環境ソリューション | Waste water treatment method, and waste water treatment device |
| US12343410B2 (en) | 2019-10-24 | 2025-07-01 | The Procter & Gamble Company | Multilayer dissolvable solid article containing coating composition and process for making the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0632836B2 (en) | 1994-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |