JPH0118038B2 - - Google Patents
Info
- Publication number
- JPH0118038B2 JPH0118038B2 JP57110868A JP11086882A JPH0118038B2 JP H0118038 B2 JPH0118038 B2 JP H0118038B2 JP 57110868 A JP57110868 A JP 57110868A JP 11086882 A JP11086882 A JP 11086882A JP H0118038 B2 JPH0118038 B2 JP H0118038B2
- Authority
- JP
- Japan
- Prior art keywords
- organic
- organic sludge
- coal ash
- fertilizer
- moisture content
- 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 26
- 239000010883 coal ash Substances 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 229910052902 vermiculite Inorganic materials 0.000 claims description 5
- 239000010455 vermiculite Substances 0.000 claims description 5
- 235000019354 vermiculite Nutrition 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000003895 organic fertilizer Substances 0.000 claims description 3
- 239000010451 perlite Substances 0.000 claims 1
- 235000019362 perlite Nutrition 0.000 claims 1
- 239000003337 fertilizer Substances 0.000 description 11
- 238000009264 composting Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000002689 soil Substances 0.000 description 8
- 239000002361 compost Substances 0.000 description 7
- 239000008187 granular material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 239000010800 human waste Substances 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 208000005156 Dehydration Diseases 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002595 cold damage Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010902 straw 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Landscapes
- Fertilizers (AREA)
Description
本発明は、下水処理、し尿処理のさいに生ずる
有機性汚泥を原料とする有機肥料の製造方法の改
良に関するものである。
一般に、下水汚泥、し尿汚泥等の有機性汚泥
は、投棄や焼却されているが、捨て場所がなく、
また費用もかかり、さらに環境汚染の原因ともな
るなどの問題がある反面、有機質成分を多量に含
有するので、これを堆肥化により肥料として有効
利用することができれば、前記問題を解消できる
と共に、近代農業における有機物不足に基づく地
力の低下を改善することが可能となる。しかしな
がら、下水汚泥、し尿汚泥等の有機性汚泥は、一
般に脱水性が悪く、遠心脱水処理等によつても80
％前後の水分を含有するため、このまゝでは水分
が多すぎて堆肥化することが困難である。すなわ
ち、有機性汚泥を好気性発酵させて堆肥化するさ
いには、嫌気性状態になることを避け、通気性を
改善するために有機性汚泥の含水率を50〜65％位
にまで低下させる必要があり、従来は水分調整材
として籾殻、稲わら、おが屑、バーク（樹皮）な
どの農産廃棄物が用いられてきた。しかし、これ
らの副資材は常時安定した入手が難しく、また難
分解性であるため、堆肥化後も分解せず、土壌還
元した場合、作物に有害な影響を及ぼす欠点があ
つた。また、前述の80％前後の含水率を有する有
機性汚泥ケーキをさらに加熱乾燥、圧搾等による
二次脱水処理を施して所望の含水率にまで低下さ
せることも可能ではあるが、経済性に乏しいとい
う避けがたい欠点があつた。
本発明は、かかる現状に鑑み、含水率が75〜85
％程度の有機性汚泥ケーキとバーミキユライト、
パーライト等の孔質鉱物粒とを混合して造粒し、
これに、石炭灰を被覆して、通気しながら急速堆
肥化することにより、入手が困難で欠点の多かつ
た副資材の欠点が改善され、しかも保水性、保肥
性に富み、植物性長促進効果の優れた有機肥料を
安価に製造し得る有機肥料の製造方法の提供を可
能ならしめるものにして、以下本発明を詳細に説
明することとする。
本発明における有機性汚泥ケーキは、下水処
理、し尿処理等のさいに生ずる有機性汚泥を高分
子凝集剤添加による遠心脱水処理等によつて含水
率を75〜85％程度となしたものであつて、加熱乾
燥、圧搾等の二次脱水処理を施していないもので
ある。
前記有機性汚泥ケーキに添加、混合する孔質鉱
物粒は、バーミキユライト、パーライト等の孔質
で、保気性、保水性に優れた粒状物であつて、そ
の一例であるバーミキユライトについて詳削に説
明するに、その組成は次表に示すようにシリカ、
マグネシア、アルミナを主成分とし、焼成により
５〜15倍に膨張せられて比重0.08〜0.2、保水性
（容水量）350〜600重量％程度を有するものであ
る。バーミキユライトはその毛細組織により高い
保水性、
The present invention relates to an improvement in a method for producing organic fertilizer using organic sludge produced during sewage treatment and human waste treatment as a raw material. Generally, organic sludge such as sewage sludge and human waste sludge is dumped or incinerated, but there is no place to dispose of it.
In addition, there are problems such as being expensive and causing environmental pollution, but since it contains a large amount of organic components, if it could be effectively used as fertilizer by composting, it would be possible to solve the above problems and modernize It becomes possible to improve the decline in soil fertility due to lack of organic matter in agriculture. However, organic sludge such as sewage sludge and human waste sludge generally has poor dewatering properties, and even when centrifugal dewatering treatment etc.
% of water, so it is difficult to compost it as it is due to too much water. In other words, when organic sludge is aerobically fermented and composted, the moisture content of organic sludge is reduced to around 50-65% in order to avoid an anaerobic state and improve aeration. Conventionally, agricultural wastes such as rice husks, rice straw, sawdust, and bark have been used as moisture regulating materials. However, these auxiliary materials are difficult to obtain consistently and are difficult to decompose, so they do not decompose even after composting, and when returned to the soil, they have the disadvantage of having a detrimental effect on crops. Additionally, it is possible to further reduce the moisture content to the desired level by subjecting the organic sludge cake, which has a moisture content of around 80%, to a secondary dehydration treatment such as heating drying or squeezing, but this is not economically viable. There was an unavoidable drawback. In view of the current situation, the present invention provides a solution with a water content of 75 to 85.
% organic sludge cake and vermiculite,
Mix with porous mineral grains such as pearlite and granulate,
By covering this with coal ash and rapidly composting it while aerating, the drawbacks of secondary materials that are difficult to obtain and have many drawbacks can be improved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below, as it makes it possible to provide a method for producing organic fertilizers that can produce organic fertilizers with excellent promotion effects at low cost. The organic sludge cake of the present invention is made by processing organic sludge generated during sewage treatment, human waste treatment, etc. by centrifugal dehydration treatment with the addition of a polymer flocculant to a moisture content of approximately 75 to 85%. It has not been subjected to secondary dehydration treatment such as heat drying or pressing. The porous mineral particles added to and mixed with the organic sludge cake are porous granules such as vermiculite and pearlite that have excellent air and water retention properties. To explain in detail, its composition is as shown in the following table: silica,
It has magnesia and alumina as its main components, expands 5 to 15 times by firing, has a specific gravity of 0.08 to 0.2, and has a water retention capacity (water capacity) of about 350 to 600% by weight. Vermiculite has high water retention due to its capillary structure,
【表】
保肥性、保気性、保温性を有しており、堆肥化の
さい、水分調整材として機能するだけでなく、肥
料分布域の拡大、作物根量の増大、土壌保水性の
増大、通気透水性の促進、肥効の持続などの土壌
改良効果をも備えている。
また、有機性汚泥ケーキと孔質鉱物粒との造粒
物を被覆する石炭灰は、SiO2とAl2O3を主成分と
し、土壌の主成分と同じであるから何らの悪影響
を及ぼさないのみならず、植物の必須元素の一つ
であるホウ素を多量に含んでおり、堆肥化にさい
して減少するにしても肥料として充分なホウ素を
含んでいるので、有効なホウ素供給源となり得
る。石炭灰の組成の一例を次表に示す。石炭灰の
代表的なものに火力[Table] It has fertilizer retention, air retention, and heat retention properties, and not only functions as a moisture regulator during composting, but also expands the fertilizer distribution area, increases crop root mass, and increases soil water retention. It also has soil improvement effects such as promoting air permeability and sustaining fertilizer effects. In addition, the coal ash that covers the granules of organic sludge cake and porous mineral particles has SiO 2 and Al 2 O 3 as its main components, which are the same as the main components of soil, so it does not have any adverse effects. In addition, it contains a large amount of boron, which is one of the essential elements for plants, and even if it decreases during composting, it still contains enough boron to be used as fertilizer, so it can be an effective source of boron. An example of the composition of coal ash is shown in the table below. Thermal power is a typical example of coal ash.
【表】
発電所で多量に生ずる石炭灰があり、これは用途
がないため、埋立処分されており、汚泥の発生量
に対して無尽蔵ともいえ、安定供給が可能であ
る。
前記の孔質鉱物、石炭灰は有機性汚泥ケーキと
混合または被覆して有機性汚泥の含水量を減少せ
しめ、堆肥化の発酵に適切な含水量とする。有機
性汚泥ケーキとの混合、被覆方法としては、先ず
有機性汚泥ケーキと孔質鉱物とを混合造粒し、こ
れに石炭灰を被覆する。造粒方法としては、例え
ば混合造粒機にて混合造粒して数mm程度の大きさ
の粒状とすることが望ましい。
このように有機性汚泥ケーキと孔質鉱物との造
粒物に石炭灰を被覆して形成したものに発酵済み
堆肥（水分率：35〜40％）を混ぜたりして全水分
率を50〜65％程度に調整し、これを連続式堆肥化
装置内に投入して、絶えず通気しながら、時々す
き返えすと、有機性汚泥ケーキ中の有機成分は好
気性菌にて急速に分解され、24〜48時間で発酵熱
は70℃程度にも達し、１〜２週間の滞留により堆
肥化が終了する。このようにして生成した肥料成
分の一部は、孔質鉱物中に吸収され、保持される
ので、保肥効果は非常に優れたものとなる。
本発明によれば、孔質鉱物と石炭灰とを有機性
汚泥ケーキの堆肥化に先立つて添加することによ
つて、有機肥料としての効果は助長され、次のよ
うな優れた効果がもたらされる。
(1) 耕土が柔らかになり、しかも弾力性が増し、
耕作しやすくなる。
(2) 添加の孔質鉱物、有機物により通気性、透水
性が増進される。
(3) 有機物が増えるため、空気の流通が良く、し
かも湿度の変化が少ないため、土壌微生物の有
効増殖が図られる。
(4) 熱吸収が良くなり、地温が高くなる。
(5) 肥料の一時流出が防げ、肥効の持続性が良好
となる。
(6) よつて、病害虫、冷害に強く、品質と味は良
くなり、増収も図られる。
以下、本発明を実施例によつて、さらに詳しく
述べることとする。
実施例
下水処理場より発生した混合生汚泥を嫌気性消
化した後の消化汚泥に高分子凝集剤を加え、遠心
脱水機にて脱水して得られた有機性汚泥ケーキ
（含水率：80％）200Kgに比重0.08のバーミキユラ
イト粒８Kgを加えて混合造粒機に造粒し、次いで
石炭灰40Kgを前記造粒機内に入れ、前記粒状物を
石炭灰で被覆した。これと発酵済み堆肥（含水
率：38％）40Kgとを混合し、連続式堆肥化装置に
入れ、通風しながら発酵させると、30時間で70℃
程度に達し、２〜３日に１回程度のすき返しを行
ない、10日で堆肥化を終えた。得られた堆肥は次
のような組成を有する。
含水率30〜40％ シリカ（SiO2）40〜50％
有機物25〜30％ アルミナ（Al2O2）５〜６％
総窒素（Ｔ−Ｎ）２〜３％ カルシウム（CaO）
2.5〜3.5％ 総リン酸（Ｔ−Ｐ）１〜２％ 苦土
（MgO）４〜５％カリウム（K2O）0.8〜１％
ホウ素(B)500〜600ppm PH７〜８
この堆肥は、保存性に富み、植物生長促進効果
も優れたものであつた。[Table] A large amount of coal ash is generated at power plants, and as it has no use, it is disposed of in landfills.It is said to be inexhaustible compared to the amount of sludge generated, and a stable supply is possible. The porous mineral, coal ash, is mixed with or coated with the organic sludge cake to reduce the water content of the organic sludge, making it suitable for fermentation in composting. As a method for mixing and coating with an organic sludge cake, first, the organic sludge cake and porous mineral are mixed and granulated, and then coated with coal ash. As for the granulation method, it is desirable to mix and granulate the mixture using, for example, a mixing granulator to form granules with a size of several mm. Fermented compost (moisture content: 35-40%) is mixed with the granulated material of organic sludge cake and porous minerals coated with coal ash to bring the total moisture content to 50-50%. When the organic sludge cake is adjusted to about 65% and placed in a continuous composting device, with constant ventilation and occasional plowing, the organic components in the organic sludge cake are rapidly decomposed by aerobic bacteria. The fermentation heat reaches around 70℃ in 24 to 48 hours, and composting is completed after 1 to 2 weeks of retention. A part of the fertilizer components thus produced are absorbed and retained in the porous minerals, resulting in an extremely excellent fertilizer retention effect. According to the present invention, by adding porous minerals and coal ash to the organic sludge cake prior to composting, the effect as an organic fertilizer is enhanced, and the following excellent effects are brought about. . (1) Cultivated soil becomes softer and more elastic,
It becomes easier to cultivate. (2) Added porous minerals and organic matter improve air permeability and water permeability. (3) Since organic matter increases, air circulation is good, and humidity changes are small, so soil microorganisms can grow effectively. (4) Heat absorption improves, raising soil temperature. (5) Temporary runoff of fertilizer is prevented and the sustainability of the fertilizer effect is improved. (6) As a result, it is resistant to pests and cold damage, has better quality and taste, and increases yield. Hereinafter, the present invention will be described in more detail with reference to Examples. Example Organic sludge cake obtained by adding a polymer flocculant to the digested sludge after anaerobically digesting mixed raw sludge generated from a sewage treatment plant and dewatering it using a centrifugal dehydrator (moisture content: 80%) 8 kg of vermiculite particles with a specific gravity of 0.08 were added to 200 kg and granulated in a mixing granulator, and then 40 kg of coal ash was placed in the granulator, and the granules were covered with coal ash. Mix this with 40kg of fermented compost (moisture content: 38%), put it in a continuous composting device, ferment it with ventilation, and it will reach 70℃ in 30 hours.
When the compost reached a certain level, the compost was completed in 10 days by re-ploughing once every 2 to 3 days. The obtained compost has the following composition. Moisture content 30~40% Silica ( SiO2 ) 40~50%
Organic matter 25-30% Alumina (Al 2 O 2 ) 5-6%
Total nitrogen (T-N) 2-3% Calcium (CaO)
2.5-3.5% Total phosphoric acid (T-P) 1-2% Magnesium (MgO) 4-5% Potassium ( K2O ) 0.8-1%
Boron (B) 500-600 ppm PH 7-8 This compost had excellent preservability and an excellent effect on promoting plant growth.
Claims (1)
バーミキユライト、パーライト等の孔質鉱物粒と
を混合して造粒し、これに石炭灰を被覆して、通
気しながら急速堆肥化することを特徴とする有機
肥料の製造方法。1 Organic sludge cake with a moisture content of about 75 to 85% is mixed with porous mineral particles such as vermiculite and perlite, granulated, coated with coal ash, and rapidly composted while aerated. A method for producing organic fertilizer characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57110868A JPS593089A (en) | 1982-06-29 | 1982-06-29 | Manufacture of organic fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57110868A JPS593089A (en) | 1982-06-29 | 1982-06-29 | Manufacture of organic fertilizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS593089A JPS593089A (en) | 1984-01-09 |
| JPH0118038B2 true JPH0118038B2 (en) | 1989-04-03 |
Family
ID=14546718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57110868A Granted JPS593089A (en) | 1982-06-29 | 1982-06-29 | Manufacture of organic fertilizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS593089A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0718168B2 (en) * | 1988-01-26 | 1995-03-01 | 上毛緑産工業株式会社 | Vegetation base formation method in slope greening work |
| JPH0723614B2 (en) * | 1988-03-08 | 1995-03-15 | 上毛緑産工業株式会社 | Method of forming vegetation base in slope greening work |
| JPH0761882A (en) * | 1993-06-16 | 1995-03-07 | Nippon Gijutsu Kaihatsu Center:Kk | Method for composing organic substance |
| JP4875809B2 (en) * | 2001-08-10 | 2012-02-15 | 双葉グリーン土木株式会社 | Sludge fertilizer |
| JP5980474B2 (en) * | 2010-09-27 | 2016-08-31 | エムシー・ファーティコム株式会社 | Method for promoting phosphate absorption of crops and method for producing phosphate absorption promoting material using fertilizer made from fertilizer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5243606A (en) * | 1975-10-03 | 1977-04-05 | Sasaki Noki Kk | Auxilialy wheel for agricultural tractor |
| JPS5742785A (en) * | 1980-08-29 | 1982-03-10 | Takasaki Kasei Kk | Soil conditioner based on activated sludge and preparation of same |
-
1982
- 1982-06-29 JP JP57110868A patent/JPS593089A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5243606A (en) * | 1975-10-03 | 1977-04-05 | Sasaki Noki Kk | Auxilialy wheel for agricultural tractor |
| JPS5742785A (en) * | 1980-08-29 | 1982-03-10 | Takasaki Kasei Kk | Soil conditioner based on activated sludge and preparation of same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS593089A (en) | 1984-01-09 |
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