JPH02211299A - Anaerobic digestion of sludge - Google Patents
Anaerobic digestion of sludgeInfo
- Publication number
- JPH02211299A JPH02211299A JP63229756A JP22975688A JPH02211299A JP H02211299 A JPH02211299 A JP H02211299A JP 63229756 A JP63229756 A JP 63229756A JP 22975688 A JP22975688 A JP 22975688A JP H02211299 A JPH02211299 A JP H02211299A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- anaerobic digestion
- days
- anaerobic
- digestion
- 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 62
- 230000029087 digestion Effects 0.000 title claims abstract description 41
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 23
- 241000894006 Bacteria Species 0.000 claims abstract description 22
- 239000010801 sewage sludge Substances 0.000 claims abstract description 5
- 238000011282 treatment Methods 0.000 abstract description 13
- 230000007928 solubilization Effects 0.000 abstract description 7
- 238000005063 solubilization Methods 0.000 abstract description 7
- 238000001238 wet grinding Methods 0.000 abstract description 3
- 210000002421 cell wall Anatomy 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 230000000813 microbial effect Effects 0.000 abstract 1
- 244000005700 microbiome Species 0.000 abstract 1
- 230000014759 maintenance of location Effects 0.000 description 8
- 239000011324 bead Substances 0.000 description 5
- 235000019621 digestibility Nutrition 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 210000001621 ilium bone Anatomy 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002062 proliferating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野〕
本発明は、下水汚泥、農水産廃棄物等の有機性汚泥を嫌
気性消化する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 anaerobically digesting organic sludge such as sewage sludge and agricultural and fishery waste.
下水処理場において発生する初沈汚泥、余剰汚泥、消化
汚泥等は、そのまま脱水後、焼却されたり廃棄されるこ
ともあるが、近年、嫌気性消化法により処理されること
が多くなった。嫌気性消化法は、嫌気状態でいわゆるメ
タン菌を増殖させることにより汚泥中の有機物を主とし
てメタンガスに分解させ、汚泥固形物の減量を行うもの
である。汚泥の嫌気性消化処理は、燃料として利用可能
なメタンガスが得られること、消費エネルギーが少ない
こと、病原菌の死滅率が高いこと、消化済み汚泥の処分
が容易なことなど、多くの利点を持つ。しかしながら、
メタン菌の増殖がきわめて遅いため、処理に長時口を要
するという問題があった。たとえば活性汚泥槽から発生
する余剰汚泥をこの方法で処理する場合、アルカリ処理
、熱処理、超音波処理など汚泥を可溶化する前処理を施
した場合においても、５０％前後の消化率（有機物分解
率）を達成するのに１５〜２０日という長い滞留日数が
必要であった。また、それ以上滞留日数を延ばしても、
達成可能な消化率は約４５％が上限であった。Initial settling sludge, surplus sludge, digested sludge, etc. generated in sewage treatment plants are sometimes incinerated or disposed of after dehydration, but in recent years, they have been increasingly treated using anaerobic digestion methods. The anaerobic digestion method is a method in which organic matter in sludge is mainly decomposed into methane gas by growing so-called methane bacteria in an anaerobic state, thereby reducing the amount of sludge solids. Anaerobic digestion of sludge has many advantages, including the production of methane gas that can be used as fuel, low energy consumption, high kill rate of pathogenic bacteria, and easy disposal of digested sludge. however,
Since methane bacteria grow extremely slowly, there is a problem in that it takes a long time for treatment. For example, when surplus sludge generated from an activated sludge tank is treated using this method, the digestibility rate (organic matter decomposition rate ) required a long residence time of 15-20 days. Furthermore, even if the stay is extended beyond that period,
The upper limit of achievable digestibility was about 45%.
同様の問題は、製あんなと農水産物加工工場からの廃棄
物、家畜糞床、帯体処理廃棄物、魚腸骨などを嫌気性消
化処理しようとする場合にもあり、したがって、これら
の分野における嫌気性消化法の普及率はまだ極めで低い
。Similar problems arise when trying to anaerobically digest waste from manufacturing plants and agricultural and fishery product processing factories, livestock manure beds, band treatment waste, fish iliac bones, etc. The penetration rate of anaerobic digestion is still extremely low.
上述のように、従来の嫌気性消化法は能率が悪く、その
ため大型の消化槽を必要とし、固形物の減量効果も満足
できるものではなかった。As mentioned above, the conventional anaerobic digestion method is inefficient, requires a large digestion tank, and has an unsatisfactory effect on reducing solids.
そこで本発明は、従来の嫌気性消化法における上述の問
題点を解決し、より短時日でより高い消化率を達成でき
るよう、嫌気性消化法を改良することを目的とするもの
である。Therefore, the present invention aims to solve the above-mentioned problems in the conventional anaerobic digestion method and to improve the anaerobic digestion method so that a higher digestibility can be achieved in a shorter time.
本発明が提供する嫌気性消化法は、有機性汚泥に可溶化
処理を施し、可溶化した汚泥を、下水汚泥中に存在しｐ
Ｈ７，８〜８．５で旺盛に増殖するメタン菌（以下、好
アルカリ性高速メタン菌という）を主要メタン菌叢とし
て存在させた嫌気性消化槽に供給し、Ｉ’Ｈを７．８〜
８．５、滞留日数を５日以下とする条件下に、種汚泥の
返送を行うことなく嫌気性消化することを特徴とする。The anaerobic digestion method provided by the present invention performs solubilization treatment on organic sludge and converts the solubilized sludge into a
Methane bacteria (hereinafter referred to as alkaliphilic fast methane bacteria) that proliferate vigorously at H7, 8 to 8.5 are supplied to an anaerobic digester in which the main methane flora is present, and I'H is increased to 7.8 to 8.5.
8.5. The sludge is characterized by anaerobic digestion without returning the seed sludge under conditions where the retention period is 5 days or less.
以下、本発明の嫌気性消化法について更に詳しく説明す
る。The anaerobic digestion method of the present invention will be explained in more detail below.
本発明の方法において嫌気性消化の前処理として行う可
溶化処理は、湿式ミル処理、超音波処理、熱処理など、
汚泥中機生物の細胞壁破砕に有効なことが知られている
周知の方法を適宜採用して行うことができる。In the method of the present invention, the solubilization treatment performed as a pretreatment for anaerobic digestion includes wet mill treatment, ultrasonic treatment, heat treatment, etc.
This can be carried out by suitably employing any well-known method known to be effective for disrupting the cell walls of organisms in sludge.
しかしながら、中でも好ましい方法は湿式ミル処理であ
る。この処理は、水中に懸濁している固形物に主として
剪断摩擦力を作用させることにより固形物の微細化を行
う処理であって、具体的には、回転円筒式ミル、振動ボ
ールミル、遠心式ボールミル、媒体攪拌式ミル、コロイ
ドミル等を用いて高度の摩砕を行うものである。However, the preferred method is wet milling. This process is a process in which solids are pulverized by mainly applying shearing frictional force to the solids suspended in water. , a media stirring type mill, a colloid mill, etc. are used to perform high-level grinding.
湿式ミル処理の中でも、媒体攪拌式ミルは処理効果の点
で最もすぐれているので、特に好ましい。この媒体攪拌
式ミルは、円筒状容器に挿入しＩ；攪拌用ディスクを高
速で回転させることによって容器内の小ボール・ビーズ
を激しく攪拌し、ビーズ間に剪断摩擦力を生じさせて摩
砕を行うものであって、用途に応じて大小様々なビーズ
が使われるが、汚泥可溶化に好ましいビーズは、粒径が
０．０５〜１１１１１のものである。その場合、攪拌用
ディスクの回転数は１０００〜３０００ｒｐｍ （周速
１０〜３０ ｍ／５ｅｅ）程度、被処理汚泥の滞留時間
は通常の汚泥を処理する場合で５〜６０分程度が適当で
ある。Among the wet milling methods, the media agitation mill is particularly preferred because it has the best processing effect. This media stirring type mill is inserted into a cylindrical container and rotates a stirring disk at high speed to violently stir the small balls and beads in the container, creating a shearing frictional force between the beads and grinding them. Beads of various sizes are used depending on the purpose, but beads with a particle size of 0.05 to 11111 are preferred for sludge solubilization. In that case, the rotational speed of the stirring disk is approximately 1000 to 3000 rpm (circumferential speed 10 to 30 m/5ee), and the residence time of the sludge to be treated is approximately 5 to 60 minutes when ordinary sludge is treated.
可溶化処理を施した後の汚泥の嫌気性消化処理は、単一
の嫌気性消化槽において次のようにして行われる。Anaerobic digestion of sludge after solubilization is performed in a single anaerobic digestion tank as follows.
可溶化した汚泥は、アルカリを加えてｐｉ−１を７．８
〜８．５に調整して消化槽に供給する。あるいは、消化
槽にアルカリを継続的に注入して、槽内汚泥のＤＨを上
記範囲内に維持する。通常、下水汚泥中のメタン菌の増
殖に好適なｐｌ（は８未満の弱アルカリ性とされている
が、酸生成菌とメタン菌とを共存させる単一槽消化の場
合、ｐＨは７〜７．６が適当とされており、したがって
、本発明の消化法においてｐＨは従来よりもかなり高い
値に設定される。これにより、汚泥成分の可溶化が更に
進み、メタン発酵を生じ易くなる。ただし、８．５より
も高いｐＨにすることは、可溶化促進の点では有利でも
、旺盛に増殖するメタン菌の十分量を槽内に蓄積させる
ことが困難になるので、好ましくない。The solubilized sludge has a pi-1 of 7.8 by adding alkali.
Adjust to ~8.5 and feed to the digester. Alternatively, alkali is continuously injected into the digestion tank to maintain the DH of the sludge in the tank within the above range. Normally, the pH value suitable for the growth of methane bacteria in sewage sludge is considered to be weakly alkaline, less than 8, but in the case of single-tank digestion in which acid-producing bacteria and methane bacteria coexist, the pH is 7 to 7. 6 is considered appropriate, and therefore, in the digestion method of the present invention, the pH is set to a much higher value than conventional ones.This further advances the solubilization of sludge components and makes it easier to cause methane fermentation.However, Although setting the pH higher than 8.5 is advantageous in promoting solubilization, it is not preferable because it becomes difficult to accumulate a sufficient amount of actively proliferating methane bacteria in the tank.
上述のようにｐｉ−１が高い状態の汚泥中で旺盛に増殖
する好アルカリ性高速メタン菌は、通常の下水汚泥や従
来の嫌気性消化槽からの消化汚泥の中には少ないが、嫌
気性消化槽の運転開始に当たりたとえば次のような馴養
期間を設けることにより、槽内メタン菌菌叢の大部分を
占めるものとすることができる。すなわち、種汚泥とす
る消化汚泥を下水処理場から採取して消化槽に入れ、有
機性汚泥の供給を開始する。ｐ）（が上記高い範囲に保
たれるよう、継続的にアルカリを添加する。As mentioned above, alkaliphilic fast methane bacteria that proliferate vigorously in sludge with high pi-1 are rare in normal sewage sludge and digested sludge from conventional anaerobic digestion tanks, but in anaerobic digestion. By providing, for example, the following acclimatization period at the start of operation of the tank, it is possible to make the methane bacteria occupy the majority of the flora in the tank. That is, digested sludge, which is used as seed sludge, is collected from a sewage treatment plant and put into a digestion tank, and the supply of organic sludge is started. p) Continuously add alkali so that (p) is kept within the above-mentioned high range.
滞留日数を約１０日以上とする運転条件をしばらく（た
とえば２週間程度）続けた後、徐々に滞留日数を短くし
、最終的に滞留日数を５〜２日程度まで短くする。この
間、消化槽から排出される汚泥を種汚泥として返送する
ことはしない。これにより、好アルカリ性高速メタン菌
が優位に、且つ高い菌数で存在する嫌気性消化槽を用意
することができる。上述のような滞留日数を徐々に短く
する馴養期間を設けることなしに、かつ種汚泥返送を行
いながら、所定のｐＨに馴化させるだけの馴養を行った
のでは、好アルカリ性高速メタン菌の゛′濃縮パは遅く
、かつ低い水準にとどまる。After continuing the operating conditions such that the residence time is approximately 10 days or more (for example, about 2 weeks), the residence time is gradually shortened, and finally the residence time is reduced to approximately 5 to 2 days. During this time, the sludge discharged from the digestion tank will not be returned as seed sludge. Thereby, it is possible to prepare an anaerobic digestion tank in which alkaliphilic fast methane bacteria are predominant and present in a high number of bacteria. If acclimation was carried out to the specified pH level without providing an acclimatization period to gradually shorten the retention period as described above and by returning the seed sludge, the alkaliphilic fast methane bacteria would Concentrates are slow and remain at a low level.
馴養が終わった後は、引続き被処理汚泥を供給して正常
運転としての嫌気性消化を開始することができる。After acclimatization is completed, anaerobic digestion can be started as normal operation by continuing to supply the sludge to be treated.
この処理において、滞留日数は５日を越えないようにす
る。特に好ましい滞留日数は、２〜３日である。滞留日
数がこれより長ずざると、槽内メタン菌のうち好アルカ
リ性高速メタン菌が占める割合が低下し、消化率の低下
を招く。また、従来の嫌気性消化法において普通に行わ
れている種汚泥の供給（消化汚泥の一部を返送する）も
、槽内の好アルカリ性高速メタン菌の比率低下を招くの
で行わない。本発明の消化法においては、用いるメタン
菌が増殖旺盛な好アルカリ性高速メタン菌であるため、
上述のような短い滞留日数でしかも種汚泥の供給なしに
運転を続けても、高率の消化を可能にする十分な菌数を
槽内に維持することができる。In this process, the number of days of residence should not exceed 5 days. A particularly preferred residence time is 2 to 3 days. If the retention period is longer than this, the ratio of alkaliphilic fast methane bacteria to the methane bacteria in the tank will decrease, leading to a decrease in digestibility. In addition, the supply of seed sludge (returning a portion of the digested sludge), which is commonly done in conventional anaerobic digestion methods, is not carried out because it causes a decrease in the proportion of alkaliphilic fast methane bacteria in the tank. In the digestion method of the present invention, the methane bacteria used are alkaliphilic fast methane bacteria that proliferate vigorously.
Even if the operation is continued for a short retention period as described above and without supplying seed sludge, a sufficient number of bacteria can be maintained in the tank to enable high-rate digestion.
都市下水処理場より採取した余剰汚泥および混合汚泥（
余剰汚泥と初沈汚泥との混合物）について、本発明によ
る嫌気性消化とその比較実験を行なった。汚泥の組成お
よび実験条件は次のとおりである。なお、滞留日数はい
ずれも３日であり、種汚泥の返送はしていない。Excess sludge and mixed sludge collected from urban sewage treatment plants (
Anaerobic digestion according to the present invention and comparative experiments were conducted on a mixture of excess sludge and initial settling sludge. The composition of the sludge and the experimental conditions are as follows. The retention period was 3 days in each case, and the seed sludge was not returned.
汚泥組成：
ＴＳ（％’） ＶＳ（％）
余剰汚泥 ３．９ ３．２混合汚泥
４．１ ３．３実験条件：
可溶化処理峯 消化槽内Ｈ
ａ（比較例） なし 無調整（６，３〜６．８）
ｂ（比較例） あり 同上
Ａ（実施例） あり ８．０（カセイソーダで調
整）葺 可溶化処理は、媒体撹拌式ミル・パールミル（
アシザワ株式会社、型式ＰＭＩＳＴＳ）をビーズ径０
、２ ａｍ、ディスク回転敦ｘ ３０ ｏｒｐｍ、 Ｍ
速度６ｍ／ｓｅｃで用いて行い、滞留時間は５分とした
。Sludge composition: TS (%') VS (%) Surplus sludge 3.9 3.2 Mixed sludge
4.1 3.3 Experimental conditions: Solubilized Mine Ha in the digestion tank (comparative example) None No adjustment (6.3 to 6.8)
b (comparative example) Yes Same as above A (example) Yes 8.0 (adjusted with caustic soda)
Ashizawa Co., Ltd., model PMISTS) with bead diameter 0
, 2 am, disk rotation rate x 30 orpm, M
The speed was 6 m/sec, and the residence time was 5 minutes.
消化槽：完全混合型
実験開始時の馴養は、下水処理場から採取した消化汚泥
を最初の種汚泥に用いて次のようにして行なった。Digestion tank: Completely mixed type Acclimation at the start of the experiment was carried out as follows using digested sludge collected from a sewage treatment plant as the initial seed sludge.
最初の２週間：滞留日数１０日
次の２週間：滞留Ｈ数５日
最後の２週間：滞留日数３日
馴養終了後ｌＯ日日間消化率、ガス発生量およびガス中
メタン濃度を測定した。測定値の平均値を表１および表
２に示す。First two weeks: Retention days 10 days Next two weeks: Retention H number 5 days Last two weeks: Retention days 3 days After acclimatization, the daily digestibility, gas generation amount, and methane concentration in the gas were measured. The average values of the measured values are shown in Tables 1 and 2.
表１ 汚泥二余剰汚泥
条件ａ 条件す
消化率（％） １９ ２８ガス発生
量（ｆｉ／ＶＳ−ｔｇ） １６０ ２４０ガス中メ
タン濃度（％） ６５ ６０条条件
表２ 汚泥：Ｉ！ｉ合汚泥
条件ａ 条件ｂ 条件Ａ
消化率（％）２３ ３５ ４８ガス発生量（Ｉ
Ｉ／ＶＳ−ｋｇ） １７０ ２８０ ３７０ガス
中メタン濃度（％） ６３ ６２ ７３〔
発明の効果〕
本発明の嫌気性消化法によれば、上述のように極めて短
い滞留日数で従来の最高の水準と同等またはそれ以上の
高い消化率を達成することができるから、従来と比べて
消化槽の単位体積当たりの処理能力の大幅な向上、ある
いは消化槽の著しい小型化が可能になるとともに、消化
汚泥発生量が減少してその後処理が容易になるという、
顕著な効果が奏される。Table 1 Sludge 2 Surplus Sludge Condition a Condition Digestion Efficiency (%) 19 28 Gas Generation Amount (fi/VS-tg) 160 240 Methane Concentration in Gas (%) 65 60 Condition Table 2 Sludge: I! i Combined sludge condition a Condition b Condition A Digestion rate (%) 23 35 48 Gas generation amount (I
I/VS-kg) 170 280 370 Methane concentration in gas (%) 63 62 73 [
[Effects of the Invention] According to the anaerobic digestion method of the present invention, as mentioned above, it is possible to achieve a high digestion rate equal to or higher than the highest level of the conventional method with an extremely short residence time. It is said that it will be possible to significantly improve the processing capacity per unit volume of the digester, or to significantly downsize the digester, and to reduce the amount of digested sludge generated, making subsequent treatment easier.
A remarkable effect is produced.
Claims (1)
水汚泥中に存在しｐＨ７．８〜８．５で旺盛に増殖する
メタン菌を主要メタン菌叢として存在させた嫌気性消化
槽に供給し、ｐＨを７．８〜８．５、滞留日数を５日以
下とする条件下に、種汚泥の返送を行うことなく嫌気性
消化することを特徴とする汚泥の嫌気性消化法。Organic sludge is solubilized and the solubilized sludge is placed in an anaerobic digestion tank in which methane bacteria, which exist in sewage sludge and proliferate vigorously at pH 7.8 to 8.5, is present as the main methane flora. A method for anaerobic digestion of sludge, characterized in that anaerobic digestion is carried out without returning seed sludge under the conditions of supplying sludge with a pH of 7.8 to 8.5 and a residence time of 5 days or less.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63229756A JPH02211299A (en) | 1988-09-16 | 1988-09-16 | Anaerobic digestion of sludge |
| DE3919176A DE3919176A1 (en) | 1988-09-16 | 1989-06-12 | Anaerobic breakdown of sludge - by solubilisation of sludge, feeding to anaerobic putrefaction tank etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63229756A JPH02211299A (en) | 1988-09-16 | 1988-09-16 | Anaerobic digestion of sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02211299A true JPH02211299A (en) | 1990-08-22 |
| JPH0470079B2 JPH0470079B2 (en) | 1992-11-09 |
Family
ID=16897189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63229756A Granted JPH02211299A (en) | 1988-09-16 | 1988-09-16 | Anaerobic digestion of sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02211299A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02211298A (en) * | 1988-09-16 | 1990-08-22 | Fujita Corp | Anaerobic digestion of sludge |
| JPH06206092A (en) * | 1993-01-08 | 1994-07-26 | Kajima Corp | Treatment of waste liquid |
| JPH10323687A (en) * | 1997-05-23 | 1998-12-08 | Nkk Corp | Method for removing phosphorus in waste water |
| JP2000070989A (en) * | 1998-09-03 | 2000-03-07 | Nkk Corp | Method and apparatus removing nitrogen in waste water |
| JP2000070987A (en) * | 1998-09-03 | 2000-03-07 | Nkk Corp | Method and apparatus for removing phosphorus in waste water |
| JP2000167597A (en) * | 1998-12-10 | 2000-06-20 | Japan Sewage Works Agency | Anaerobic digestion of organic sludge |
| JP2018183735A (en) * | 2017-04-25 | 2018-11-22 | 株式会社竹中工務店 | Processing method of biomass |
| CN114956320A (en) * | 2022-05-12 | 2022-08-30 | 红菌生物(广东)有限公司 | Method for rapidly enriching marine anaerobic ammonium oxidation bacteria |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02211298A (en) * | 1988-09-16 | 1990-08-22 | Fujita Corp | Anaerobic digestion of sludge |
-
1988
- 1988-09-16 JP JP63229756A patent/JPH02211299A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02211298A (en) * | 1988-09-16 | 1990-08-22 | Fujita Corp | Anaerobic digestion of sludge |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02211298A (en) * | 1988-09-16 | 1990-08-22 | Fujita Corp | Anaerobic digestion of sludge |
| JPH0470078B2 (en) * | 1988-09-16 | 1992-11-09 | Fujita Kk | |
| JPH06206092A (en) * | 1993-01-08 | 1994-07-26 | Kajima Corp | Treatment of waste liquid |
| JPH10323687A (en) * | 1997-05-23 | 1998-12-08 | Nkk Corp | Method for removing phosphorus in waste water |
| JP2000070989A (en) * | 1998-09-03 | 2000-03-07 | Nkk Corp | Method and apparatus removing nitrogen in waste water |
| JP2000070987A (en) * | 1998-09-03 | 2000-03-07 | Nkk Corp | Method and apparatus for removing phosphorus in waste water |
| JP2000167597A (en) * | 1998-12-10 | 2000-06-20 | Japan Sewage Works Agency | Anaerobic digestion of organic sludge |
| JP2018183735A (en) * | 2017-04-25 | 2018-11-22 | 株式会社竹中工務店 | Processing method of biomass |
| CN114956320A (en) * | 2022-05-12 | 2022-08-30 | 红菌生物(广东)有限公司 | Method for rapidly enriching marine anaerobic ammonium oxidation bacteria |
| CN114956320B (en) * | 2022-05-12 | 2023-09-22 | 红菌生物(广东)有限公司 | Method for rapidly enriching marine anaerobic ammonia oxidizing bacteria |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0470079B2 (en) | 1992-11-09 |
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