JPH04100598A - Sewage-type wastewater treatment method - Google Patents
Sewage-type wastewater treatment methodInfo
- Publication number
- JPH04100598A JPH04100598A JP21576990A JP21576990A JPH04100598A JP H04100598 A JPH04100598 A JP H04100598A JP 21576990 A JP21576990 A JP 21576990A JP 21576990 A JP21576990 A JP 21576990A JP H04100598 A JPH04100598 A JP H04100598A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- treatment
- nitrification
- mlss
- solid
- 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
- 238000004065 wastewater treatment Methods 0.000 title 1
- 239000010802 sludge Substances 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000926 separation method Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000005189 flocculation Methods 0.000 claims abstract description 8
- 230000016615 flocculation Effects 0.000 claims abstract description 8
- 239000002351 wastewater Substances 0.000 claims abstract description 6
- 239000010800 human waste Substances 0.000 claims description 22
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 239000011574 phosphorus Substances 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract 3
- 230000003311 flocculating effect Effects 0.000 abstract 1
- 239000010865 sewage Substances 0.000 abstract 1
- 238000005273 aeration Methods 0.000 description 7
- 239000012528 membrane Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、し尿系汚水の処理方法に係り、特に、し尿の
生物処理汚泥と浄化槽汚泥の処理方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for treating human waste, and particularly to a method for treating biologically treated human waste sludge and septic tank sludge.
便所水洗化の普及に伴い浄化槽が増加しているが、その
結果し尿処理施設に搬入されるし尿系汚水として汲取し
尿が減少し、浄化槽汚泥が増加している。そのような施
設では、浄化槽汚泥はほとんどし尿と同一の処理装置で
混合処理されている。With the spread of toilet flushing, the number of septic tanks is increasing, but as a result, the amount of human waste that is collected as human waste water that is transported to human waste treatment facilities is decreasing, and the amount of septic tank sludge is increasing. In such facilities, septic tank sludge is mostly mixed and treated with human waste in the same processing equipment.
ところで、浄化槽汚泥の汚濁成分は浮遊物が主であり、
し尿と異なり、溶解性汚濁物質の濃度が低い。このよう
な浄化槽汚泥をし尿と混合し、し尿と同一の技術思想で
処理を行うのは合理的でない。By the way, the pollutant components of septic tank sludge are mainly suspended matter.
Unlike human waste, it has a low concentration of soluble pollutants. It is not reasonable to mix such septic tank sludge with human waste and treat it using the same technical concept as human waste.
そこで、本発明は、し尿と浄化槽汚泥を全量同一装置で
処理する従来技術の欠点を改良し、それぞれを合理的に
処理するし尿系汚水の処理方法を提供することを目的と
する。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to improve the drawbacks of the conventional technology in which human waste and septic tank sludge are completely treated in the same device, and to provide a method for treating human waste wastewater that rationally processes each of them.
上記目的を達成するために、本発明では、し尿を実質的
に無希釈の高ＭＬＳＳの硝化脱窒処理工程、低ＭＬＳＳ
の硝化脱窒処理工程及び凝集処理工程で処理する方法に
おいて、前記硝化脱窒処理工程で発生する余剰汚泥又は
該余剰汚泥と凝集処理工程でのり集汚泥を、浄化槽から
の汚泥と混合したのち、該混合汚泥を固液分離し、分離
水を前記低ＭＬＳＳ処理工程に導入することを特徴とす
るし尿系汚水の処理方法としたものである。In order to achieve the above object, the present invention provides a substantially undiluted high MLSS nitrification and denitrification treatment process for human waste, a low MLSS
In the method of processing in the nitrification and denitrification treatment step and the flocculation treatment step, after mixing the excess sludge generated in the nitrification and denitrification treatment step or the surplus sludge and the collected sludge in the flocculation treatment step with the sludge from the septic tank, This method of treating night soil wastewater is characterized in that the mixed sludge is separated into solid and liquid, and the separated water is introduced into the low MLSS treatment step.
上記処理方法において、高ＭＬＳＳの硝化脱窒処理工程
と低ＭＬＳＳの硝化脱窒処理工程との間に機械的固液分
離工程を配するのが良く、また、浄化槽からの汚泥を混
合した混合汚泥は、酸化処理又は硝化脱窒処理をしたの
ちに固液分離するのがよい。In the above treatment method, it is preferable to arrange a mechanical solid-liquid separation step between the high MLSS nitrification denitrification treatment step and the low MLSS nitrification denitrification treatment step, and also to use mixed sludge mixed with sludge from the septic tank. It is preferable to carry out solid-liquid separation after oxidation treatment or nitrification-denitrification treatment.
次に、本発明を、その一実施態様について示した第１図
の工程図を用いて説明する。Next, the present invention will be explained using the process diagram of FIG. 1 showing one embodiment thereof.
第１図において、し尿１は無希釈で、１００００〜１５
０００ｍｇ／ｊ！のＭＬＳＳ濃度で硝化脱窒処理の行わ
れている高ＭＬＳＳ処理工程２に流入し、し尿中の窒素
の大部分が脱窒されたのち、固液分離工程３に導入され
、濃縮汚泥４と分離水５に分離される。濃縮汚泥４の大
部分は返送汚泥６として高ＭＬＳＳ処理工程２に返送さ
れ、残部は余剰汚泥７として好気的条件にある浄化槽汚
泥処理工程８に導入される。分離水５は、２０００〜８
０００Ｂ／１のＭＬ Ｓ Ｓ！度で硝化脱窒の行われて
いる低ＭＬＳＳ処理工程９に導入され、硝化脱窒処理が
行われたのち、固液分離工程１０に導入され、濃縮汚泥
１１と分離水１４に分離される。濃縮汚泥１１０大部分
は返送汚泥１２として低ＭＬＳＳ処理工程９に返送され
、残部は余剰汚泥１３として浄化槽汚泥処理工程８ある
いは高ＭＬＳＳ処理工程２に移送される。In Figure 1, human waste 1 is undiluted and has a concentration of 10,000 to 15
000mg/j! The waste flows into the high MLSS treatment process 2 where nitrification and denitrification treatment is carried out at an MLSS concentration of It is separated into water 5. Most of the thickened sludge 4 is returned to the high MLSS treatment step 2 as return sludge 6, and the remainder is introduced as excess sludge 7 to the septic tank sludge treatment step 8 under aerobic conditions. Separated water 5 is 2000-8
000B/1 ML SS! The sludge is introduced into a low MLSS treatment step 9 where nitrification and denitrification are performed at a high temperature, and after the nitrification and denitrification treatment is performed, it is introduced into a solid-liquid separation step 10 where it is separated into concentrated sludge 11 and separated water 14. Most of the thickened sludge 110 is returned to the low MLSS treatment process 9 as return sludge 12, and the remainder is transferred to the septic tank sludge treatment process 8 or the high MLSS treatment process 2 as surplus sludge 13.
固液分離工程３．１０の分離装置としては、高ＭＬＳＳ
処理工程３の流出液に対しては遠心分離機、膜分離装置
などの機械式分離装置がよく、低ＭＬＳＳ処理工程９に
対しては沈殿槽が推奨される。なお、固液分離工程３は
なるべく設けるのが好ましいが、かならずしも設ける必
要はなく、その場合には低ＭＬＳＳ工程９に希釈水を導
入するようにする。As the separation device for solid-liquid separation step 3.10, high MLSS
Mechanical separators such as centrifuges and membrane separators are suitable for the effluent of the treatment step 3, and a settling tank is recommended for the low MLSS treatment step 9. Although it is preferable to provide the solid-liquid separation step 3 as much as possible, it is not always necessary to provide it, and in that case, dilution water is introduced into the low MLSS step 9.
分離水１４中に残留するリン、ＣＯＤ成分は、凝集処理
工程１５で、硫酸バンド、塩化第２鉄などの凝集剤によ
って凝集されたのち、固液分離工程１６に導入され、凝
集汚泥１７と分離水１８に分離される。凝集汚泥１７は
浄化槽汚泥処理工程８に移送される。浄化槽汚泥１９は
浄化槽汚泥処理工程８において、余剰汚泥７．１３、又
は該余剰汚泥７．１３と凝集汚泥１７とともに混合し、
必要により曝気して生物学的酸化処理するか、生物学的
硝化脱窒処理したのち、固液分離工程２１に導入される
。同工程２１において、混合汚泥２０は分離濃縮あるい
は直接脱水される。分離水２２は低ＭＬＳＳ処理工程９
に導入され、分離水２２中に残留する汚濁成分が除去さ
れる。Phosphorus and COD components remaining in the separated water 14 are flocculated by a flocculant such as sulfuric acid or ferric chloride in a coagulation treatment step 15, and then introduced into a solid-liquid separation step 16 where they are separated from flocculated sludge 17. It is separated into water 18. The flocculated sludge 17 is transferred to a septic tank sludge treatment step 8. The septic tank sludge 19 is mixed with the surplus sludge 7.13, or the surplus sludge 7.13 and the flocculated sludge 17 in the septic tank sludge treatment step 8,
After being subjected to aeration and biological oxidation treatment or biological nitrification and denitrification treatment if necessary, it is introduced into the solid-liquid separation step 21. In the same step 21, the mixed sludge 20 is separated and concentrated or directly dehydrated. Separated water 22 is low MLSS treatment step 9
The pollutants remaining in the separated water 22 are removed.
このように処理することにより、浄化槽汚泥は、し尿の
生物処理における余剰汚泥と一緒に処理されるたｔ、浄
化槽汚泥をし尿と一緒に生物処理する従来方法に比べ、
処理装置を縮小でき合理的に処理できる。By processing in this way, septic tank sludge is treated together with excess sludge in the biological treatment of human waste, and compared to the conventional method of biologically treating septic tank sludge together with human waste,
Processing equipment can be downsized and processing can be done rationally.
以下、本発明を実施例により具体的に説明するが、本発
明はこれらの実施例に限定されない。EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.
実施例１
第２図に示す本発明の装置の工程図に従って行った本発
明の実施例について説明する。Example 1 An example of the present invention carried out according to the process diagram of the apparatus of the present invention shown in FIG. 2 will be described.
（１）装置
高ＭＬＳＳ処理工程 脱窒槽Ａ２３、１５ｍ３硝化槽
Ａ２４、２０ｆｆＩ３
ＵＦ膜分離装置３、チューブラ型ポリ
オレフィン膜
・低ＭＬＳＳ処理工程 硝化槽Ｂ２６、２ｍ３脱窒槽
Ｂ２７、５ｍ’
再曝気槽２８、 １ｍ３
沈殿槽１０、 ３ｆｆ１３
・凝集処理工程 凝集処理槽１５．１．０ｍ’ＵＦ
膜分離装置１６、チューブラ型ポ
リオレフィン膜
・浄化槽汚泥処理槽８、１５ｍ３
（２） 方 法
し尿膜入量１、 ５に１／日
浄化槽汚泥投入量１９、 ５ｋｌｌ１日循環水量２５
、 １５０ ｍ’／日返送汚泥量 高ＭＬＳ
Ｓ処理工程６、５ｍ３７日〃 低ＭＬＳＳ 〃
１２．１２〃実施装置に供したし尿及び浄化槽汚泥の性
状を第１表に、処理結果を第２表に示烹。(1) Equipment high MLSS treatment process Denitrification tank A23, 15m3 Nitrification tank A24, 20ffI3 UF membrane separation device 3, tubular polyolefin membrane/low MLSS treatment process Nitrification tank B26, 2m3 Denitrification tank B27, 5m' Re-aeration tank 28, 1m3 Sedimentation tank 10, 3ff13 ・Flocculation treatment process Flocculation treatment tank 15.1.0m'UF
Membrane separation device 16, tubular type polyolefin membrane/septic tank sludge treatment tank 8, 15m3 (2) Method Altoic membrane input 1, 5 to 1/day Septic tank sludge input 19, 5kll daily circulating water amount 25
, 150 m'/day Return sludge volume High MLS
S treatment process 6.5m 37 days 〃 Low MLSS 〃
12.12 The properties of human waste and septic tank sludge submitted to the implementation equipment are shown in Table 1, and the treatment results are shown in Table 2.
なお、本発明実施例において、浄化槽汚泥処理槽の曝気
風量を調整し、槽内Ｄ○を０．０〜０、５ ｍｇ／ １
に維持することによって硝化脱窒を行うことができ、流
入無機性窒素の７０％を除去することができた。In addition, in the embodiment of the present invention, the aeration air volume of the septic tank sludge treatment tank was adjusted, and the tank internal D○ was 0.0 to 0.5 mg/1.
By maintaining the temperature at
第 表 ］ｔＪ−ｚ 注１） 零 零−２ 従来方式は、し尿と浄化槽汚泥を それぞれ５に１／日（合計１０ｋｌ Ｚ日）づつ、高ＭＬＳＳ処理工程 に直接混合投入し、順次低ＭＬＳ Ｓ処理工程、凝集処理工程で処理 を行ったときの実施例である。No. table ]tJ-z Note 1) zero Zero-2 The conventional method removes human waste and septic tank sludge. 1/day in 5 each (total 10kl) Z days) each time, high MLSS treatment process directly mixed into the Processed with S treatment process and agglomeration treatment process This is an example when performing the following.
低ＭＬＳＳ処理工程容積は本発明、 従来法とも同じである。The low MLSS processing process volume of the present invention, This is the same as the conventional method.
実施例２
次に、浄化槽汚泥処理槽の曝気条件のみを変えて、他の
条件は実施例１と同様にして実験した。Example 2 Next, an experiment was conducted in the same manner as in Example 1 except that only the aeration conditions of the septic tank sludge treatment tank were changed.
曝気条件を変えたときの浄化槽汚泥処理槽の水質（脱水
分離水）を第３表に示す。浄化槽汚泥処理槽は、Ｄｏが
１．２〜２．２ ｍｇ／ Ｉ！になるように十分曝気し
た場合も浄化槽汚泥処理槽の曝気風量を槽内各流入汚泥
の混合攪拌が行われるのみの風量にした場合（槽内ＤＯ
Ｏｍｇ／β）でも、また槽内で硝化脱窒が同時に行われ
るようにした風量にした場合（槽内Ｄ○ ０，１〜０、
３ ｍｇ／ １ ）でも、低ＭＬＳＳ処理工程、凝集処
理工程分離水水質にはほとんど変化がなかった。Table 3 shows the water quality (dehydrated separated water) of the septic tank sludge treatment tank when the aeration conditions were changed. The septic tank sludge treatment tank has a Do of 1.2 to 2.2 mg/I! Even when sufficient aeration is carried out so that
Omg/β), and when the air volume is set so that nitrification and denitrification are performed simultaneously in the tank (D○ in the tank 0, 1 to 0,
Even at 3 mg/1), there was almost no change in the quality of the separated water in the low MLSS treatment process and flocculation treatment process.
第 ３
表
注）本−３無機性−Ｎ＝ Ｎｆｌａ−Ｎ＋Ｎ０ｘ−Ｎ〔
発明の効果〕
し尿、浄化槽汚泥を同一のプロセスで処理する従来方式
に比べ、本発明では次のような実用的効果を得ることが
できる。Table 3 Note) Book-3 Inorganic-N= Nfla-N+N0x-N [
Effects of the Invention] Compared to the conventional method in which human waste and septic tank sludge are treated in the same process, the present invention can provide the following practical effects.
（１）高ＭＬＳＳ処理工程では、汚泥発生量が高く、発
熱量の高いし尿のみを処理するので、高ＭＬ Ｓ Ｓｌ
１度、高水温を維持できるたｔ１処理槽単位容積あたり
の処理量を大幅に向上することができる。これによって
プロセス全体の水槽容積を縮小することができる。(1) In the high MLSS treatment process, only human waste that generates a high amount of sludge and has a high calorific value is processed.
By maintaining a high water temperature once, the throughput per unit volume of the t1 treatment tank can be significantly improved. This allows the tank volume of the entire process to be reduced.
（２）高ＭＬＳＳ処理工程に後続する固液分離工程にか
かる水量負荷を従来方式よりも大幅に少なくできるので
、建設費、維持管理費を低減することができる。(2) Since the water load required for the solid-liquid separation process subsequent to the high MLSS treatment process can be significantly reduced compared to conventional systems, construction costs and maintenance costs can be reduced.
第１図は、本発明の処理方法の概要を示す工程図、第２
図は、実施例に用いた装置の工程図である。
１・・・し尿、２・・・高ＭＬＳＳ処理工程、３・・・
固液分離工程、４・・・濃縮汚泥、５・・・分離水、６
・・・返送汚泥、７・・・余剰汚泥、８・・・浄化槽汚
泥処理工程、９・・・低ＭＬＳＳ処理工程、１０・・・
固液分離工程、１１・・・濃縮汚泥、１２．１３・・・
返送汚泥、１３’・・・余剰汚泥、１４・・・分離水、
１５・・・凝集分離工程、１６・・・固液分離工程、１
７・・・凝集汚泥、１８・・・分離水、１９・・・浄化
槽汚泥、２０・・・混合汚泥、２１・・・固液分離工程
、２２・・・分離水、２３・・・脱窒槽Ａ１２４・・・
硝化槽Ａ１２５・・・循環水、２６・・硝化槽Ｂ、２７
・・・脱窒槽Ｂ１２８・・・雨曝気槽、２９・・・アル
コール、３０・・・無機凝集剤、３１・・・脱水ケーキFIG. 1 is a process diagram showing an overview of the treatment method of the present invention, and FIG.
The figure is a process diagram of the apparatus used in the example. 1... Human waste, 2... High MLSS treatment process, 3...
Solid-liquid separation step, 4... Thickened sludge, 5... Separated water, 6
...Return sludge, 7... Surplus sludge, 8... Septic tank sludge treatment process, 9... Low MLSS treatment process, 10...
Solid-liquid separation step, 11...Thickened sludge, 12.13...
Returned sludge, 13'...excess sludge, 14...separated water,
15... Coagulation separation step, 16... Solid-liquid separation step, 1
7... Coagulated sludge, 18... Separated water, 19... Septic tank sludge, 20... Mixed sludge, 21... Solid-liquid separation process, 22... Separated water, 23... Denitrification tank A124...
Nitrification tank A125...Circulating water, 26...Nitrification tank B, 27
... Denitrification tank B128 ... Rain aeration tank, 29 ... Alcohol, 30 ... Inorganic flocculant, 31 ... Dehydrated cake
Claims (1)
工程、低ＭＬＳＳの硝化脱窒処理工程及び凝集処理工程
で処理する方法において、前記硝化脱窒処理工程で発生
する余剰汚泥又は該余剰汚泥と凝集処理に程での凝集汚
泥を、浄化槽からの汚泥と混合したのち、該混合汚泥を
固液分離し、分離水を前記低ＭＬＳＳ処理工程に導入す
ることを特徴とするし尿系汚水の処理方法。 ２、前記高ＭＬＳＳの硝化脱窒処理工程と低ＭＬＳＳの
硝化脱窒処理工程との間に機械的固液分離工程を配した
ことを特徴とする請求項１記載のし尿系汚水の処理方法
。 ３、前記混合汚泥は酸化処理又は硝化脱窒処理をしたの
ち固液分離することを特徴とする請求項１又は２記載の
し尿系汚水の処理方法。[Scope of Claims] 1. A method for treating human waste in a substantially undiluted high MLSS nitrification and denitrification treatment step, a low MLSS nitrification and denitrification treatment step, and a flocculation treatment step, in which: After mixing the generated surplus sludge or the surplus sludge and flocculated sludge during the flocculation treatment with sludge from the septic tank, the mixed sludge is separated into solid and liquid, and the separated water is introduced into the low MLSS treatment process. Characteristic method for treating human waste wastewater. 2. The method for treating night soil wastewater according to claim 1, characterized in that a mechanical solid-liquid separation step is arranged between the high MLSS nitrification denitrification treatment step and the low MLSS nitrification denitrification treatment step. 3. The method for treating night soil wastewater according to claim 1 or 2, wherein the mixed sludge is subjected to oxidation treatment or nitrification-denitrification treatment and then subjected to solid-liquid separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2215769A JPH0655317B2 (en) | 1990-08-17 | 1990-08-17 | Treatment method for human waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2215769A JPH0655317B2 (en) | 1990-08-17 | 1990-08-17 | Treatment method for human waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04100598A true JPH04100598A (en) | 1992-04-02 |
| JPH0655317B2 JPH0655317B2 (en) | 1994-07-27 |
Family
ID=16677924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2215769A Expired - Lifetime JPH0655317B2 (en) | 1990-08-17 | 1990-08-17 | Treatment method for human waste |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0655317B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56129096A (en) * | 1980-03-14 | 1981-10-08 | Kubota Ltd | Disposal of night soil type sludge |
| JPS5851995A (en) * | 1981-09-25 | 1983-03-26 | Ebara Infilco Co Ltd | Treatment of night soil |
-
1990
- 1990-08-17 JP JP2215769A patent/JPH0655317B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56129096A (en) * | 1980-03-14 | 1981-10-08 | Kubota Ltd | Disposal of night soil type sludge |
| JPS5851995A (en) * | 1981-09-25 | 1983-03-26 | Ebara Infilco Co Ltd | Treatment of night soil |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0655317B2 (en) | 1994-07-27 |
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