JPH11197686A - Method for storing activated sludge - Google Patents
Method for storing activated sludgeInfo
- Publication number
- JPH11197686A JPH11197686A JP822398A JP822398A JPH11197686A JP H11197686 A JPH11197686 A JP H11197686A JP 822398 A JP822398 A JP 822398A JP 822398 A JP822398 A JP 822398A JP H11197686 A JPH11197686 A JP H11197686A
- Authority
- JP
- Japan
- Prior art keywords
- activated sludge
- sludge
- trehalose
- stored
- activity
- 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
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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排水処理に使用す
る活性汚泥について、活性を維持したまま長期保存でき
る活性汚泥の保存方法に関する。[0001] The present invention relates to a method for storing activated sludge which can be stored for a long period of time while maintaining the activity of activated sludge used for wastewater treatment.
【０００２】[0002]
【従来の技術】排水中の窒素，有機物，重金属等の生物
排水処理法に用いられる活性汚泥の保存方法としては、
乾燥法（凍結乾燥，常圧乾燥，噴霧乾燥等）、凍結法
（冷凍庫保存，液体窒素保存等）などの方法がある。こ
のうち乾燥法は、微生物の受けるダメージが大きく、微
生物活性の低下を招き易いという問題点がある。一方、
凍結法は、保存菌体の容積（重量）が大きくなり、保管
・運搬に不便であるという問題点がある。2. Description of the Related Art Activated sludge used for biological wastewater treatment of nitrogen, organic matter, heavy metals, and the like in wastewater is preserved as follows.
There are methods such as a drying method (freeze drying, normal pressure drying, spray drying, etc.) and a freezing method (freezer storage, liquid nitrogen storage, etc.). Among them, the drying method has a problem that the microorganisms are greatly damaged and the microbial activity is easily reduced. on the other hand,
The freezing method has a problem that the volume (weight) of the preserved cells increases, which is inconvenient for storage and transportation.
【０００３】[0003]
【発明が解決しようとする課題】本発明者らは、上記問
題点に鑑み、保管・運搬に有利な乾燥保存法において、
微生物の受けるダメージを極力小さくし、微生物活性の
低下を招かず、そして活性汚泥の活性を維持した状態で
保存できる方法を開発すべく鋭意検討した。その結果、
本発明者らは、活性汚泥にトレハロースを存在させて乾
燥処理を行うことにより、かかる問題点が解決されるこ
とを見い出した。本発明は、かかる見地より完成された
ものである。DISCLOSURE OF THE INVENTION In view of the above problems, the present inventors have proposed a dry preservation method advantageous for storage and transportation.
We studied diligently to develop a method that minimizes damage to microorganisms, does not cause a decrease in microbial activity, and can preserve activated sludge while maintaining the activity. as a result,
The present inventors have found that such a problem can be solved by performing a drying treatment in the presence of trehalose in activated sludge. The present invention has been completed from such a viewpoint.
【０００４】[0004]
【課題を解決するための手段】すなわち、本発明は、ト
レハロースの存在下、活性汚泥を乾燥処理して保存する
ことを特徴とする活性汚泥の保存方法を提供するもので
ある。本発明では、活性汚泥に、上記トレハロースを粉
体又は水溶液の状態で添加することが好ましく、また、
活性汚泥について、上記トレハロースが１重量％以上含
有するように添加してあることが好ましい。ここで、ト
レハロースとは、分子式Ｃ12Ｈ22Ｏ11の２糖類の１つで
あり、２分子のＤ−グルコースがその還元性基同士で結
合した化合物であり、本発明では該トレハロース及びそ
の誘導体が含まれる。なお、結合様式については、特に
制限されるものではない。That is, the present invention provides a method for storing activated sludge, comprising drying and storing activated sludge in the presence of trehalose. In the present invention, it is preferable to add the trehalose to the activated sludge in the form of powder or an aqueous solution,
The activated sludge is preferably added so that the above-mentioned trehalose is contained in an amount of 1% by weight or more. Here, trehalose is one of disaccharides having a molecular formula of C 12 H 22 O 11 , and is a compound in which two molecules of D-glucose are bonded to each other via a reducing group. In the present invention, trehalose and its derivative Is included. Note that there is no particular limitation on the bonding mode.
【０００５】本発明では上記のような乾燥処理すること
によって、活性汚泥を長期間保存しても活性の低下が少
なく、また、保管・運搬等に有利な状態で活性汚泥を保
存することができる。そして、本発明によれば、活性汚
泥が必要な場合、例えば緊急性を有するような場合であ
っても、速やかに供給あるいは提供することが可能であ
り、活性汚泥を長期間にわたって保存，ストックしてお
くことができる。以下、本発明について、詳細に説明す
る。In the present invention, by performing the above-mentioned drying treatment, even if the activated sludge is stored for a long period of time, the activity is less reduced, and the activated sludge can be stored in a state advantageous for storage and transportation. . According to the present invention, when activated sludge is required, for example, even in an emergency, the activated sludge can be promptly supplied or provided, and the activated sludge can be stored and stocked for a long period of time. Can be kept. Hereinafter, the present invention will be described in detail.
【０００６】[0006]
【発明の実施の形態】本発明は、トレハロースの存在
下、活性汚泥を乾燥処理して保存することを特徴とする
活性汚泥の保存方法である。実施の形態 本発明において、保存処理の対象となる活性汚泥は、生
物排水処理装置の活性汚泥槽内から採取したもの、ある
いは余剰汚泥のいずれでもよい。具体的には、し尿処理
場，下水処理場，電力排水処理装置，化学工業排水処理
装置等の活性汚泥が挙げられる。この活性汚泥は、好気
性処理法に用いられる好気性汚泥，嫌気性処理法に用い
られる嫌気性汚泥のいずれでもよい。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a method for storing activated sludge, comprising drying and storing activated sludge in the presence of trehalose. BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, activated sludge to be subjected to a preservation treatment may be either one collected from an activated sludge tank of a biological wastewater treatment device or excess sludge. Specific examples include activated sludge from a human waste treatment plant, a sewage treatment plant, an electric wastewater treatment device, and a chemical industry wastewater treatment device. This activated sludge may be any of aerobic sludge used in the aerobic treatment method and anaerobic sludge used in the anaerobic treatment method.
【０００７】本発明の保存方法では、上記のような活性
汚泥をトレハロースの存在下に、乾燥処理することによ
り、保存中の活性低下が少なく、かつ、保管性や運搬性
にも優れた乾燥汚泥を調製（作成）する。保存処理する
活性汚泥は、フロック状の懸濁状態のものが好ましい
が、その他、活性汚泥を粒状，繊維状等の担体に担持さ
せた状態でも保存処理を行うことができる。ここで、担
体としては、活性汚泥を付着，包括等の方法により担持
できるものであれば特に制限はなく、付着担体や包括担
体等が広く用いられる。このうち付着担体としては、具
体的には、例えば砂，活性炭，セラミック等が挙げられ
る。一方、包括担体としては、具体的には、例えばポリ
ビニルアルコール（ＰＶＡ），ポリエチレングリコール
（ＰＥＧ）等が挙げられる。[0007] In the storage method of the present invention, the activated sludge as described above is dried in the presence of trehalose, so that the reduced activity during storage is small, and the dried sludge is excellent in storage and transportability. Is prepared (created). The activated sludge to be subjected to the preservation treatment is preferably in a floc-like suspended state, but the preservation treatment can also be performed in a state in which the activated sludge is supported on a granular or fibrous carrier. Here, the carrier is not particularly limited as long as the activated sludge can be supported by a method such as attachment and inclusion, and an attachment carrier and an inclusion carrier are widely used. Among them, specific examples of the adhesion carrier include sand, activated carbon, and ceramic. On the other hand, specific examples of the entrapping carrier include polyvinyl alcohol (PVA) and polyethylene glycol (PEG).
【０００８】活性汚泥は、排水処理装置から採取したま
まの状態でも処理できるが、自然沈降させるか、あるい
は、汚泥脱水機や遠心分離機等を用いて脱水，濃縮させ
ることが好ましい。保存処理に用いる活性汚泥の濃度
は、好ましくは１，０００ｍｇ／ｌ以上、さらに好まし
くは２０，０００〜１００，０００ｍｇ／ｌである。[0008] Activated sludge can be treated as it is collected from a wastewater treatment apparatus, but it is preferable that the activated sludge be naturally settled or dewatered and concentrated using a sludge dewatering machine or a centrifugal separator. The concentration of the activated sludge used for the preservation treatment is preferably 1,000 mg / l or more, more preferably 20,000 to 100,000 mg / l.
【０００９】本発明においては、トレハロースは種々の
状態で活性汚泥に添加することができ、特に制限される
ものではないが、好ましくは粉体又は水溶液の状態で活
性汚泥に添加する。この場合、添加するトレハロースの
量は、乾燥処理後の活性汚泥中の濃度として、トレハロ
ースが１重量％以上含有するように添加することが好ま
しく、３〜１０重量％の範囲内にすることがさらに好ま
しい。In the present invention, trehalose can be added to the activated sludge in various states, and is not particularly limited, but is preferably added to the activated sludge in the form of a powder or an aqueous solution. In this case, the amount of trehalose to be added is preferably such that the concentration of trehalose in the activated sludge after the drying treatment is 1% by weight or more, and more preferably in the range of 3 to 10% by weight. preferable.
【００１０】トレハロースを添加した活性汚泥は、凍結
乾燥，Ｌ−乾燥，常圧乾燥（風乾），噴霧乾燥等の微生
物の保存法として採用されているのと同様の方法によっ
て、乾燥処理できる。本発明において、乾燥処理後の菌
体の保存は好ましくは１０℃以下、より好ましくは４℃
以下で行うが、保存菌体の運搬に際しては、２〜３日間
の運搬であれば１０〜３０℃での保存（保管）も許容さ
れる。上記本発明の活性汚泥の保存方法によれば、トレ
ハロースを添加することにより活性を維持した状態で活
性汚泥を乾燥保存できるようにしたので、活性低下が少
なく、保管・運搬に有利な状態で活性汚泥を保存するこ
とができる。The activated sludge to which trehalose has been added can be subjected to drying treatment by freeze drying, L-drying, atmospheric drying (air drying), spray drying, or the like, which is the same as that employed for preserving microorganisms. In the present invention, storage of the cells after the drying treatment is preferably 10 ° C. or less, more preferably 4 ° C.
As will be described below, when transporting the preserved cells, storage (storage) at 10 to 30 ° C. is also permitted if transported for 2 to 3 days. According to the method for storing activated sludge of the present invention, the activated sludge can be dried and stored while maintaining the activity by adding trehalose, so that the activity is reduced and the activity is reduced in a state advantageous for storage and transportation. Sludge can be stored.
【００１１】他の実施の形態 本発明に係る活性汚泥の保存方法は、上記実施の形態に
限らず、本発明の技術的思想の範囲において、種々変形
が可能である。例えば、活性汚泥を乾燥処理する際、ト
レハロースを存在させるには、上記したような活性汚泥
にトレハロースを添加する場合の他、活性汚泥をトレハ
ロースの溶液等に混ぜることなども可能であり、特に制
限されることなく実施できる。以下、実施例により本発
明をより詳細に説明するが、本発明はこれらの実施例に
よって何ら制限されるものではない。 Other Embodiments The method for storing activated sludge according to the present invention is not limited to the above-described embodiment, but can be variously modified within the technical idea of the present invention. For example, when the activated sludge is dried, the presence of trehalose is not limited to the case where trehalose is added to the activated sludge as described above, and it is also possible to mix the activated sludge with a trehalose solution or the like. It can be implemented without being done. Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００１２】[0012]
【実施例】実施例１〜２、比較例１〜４及び参考例１ 本実施例１及び２では、活性汚泥として、アンモニア含
有排水の処理に用いられる硝化汚泥を使用して本発明の
効果を確認した。そして、添加物質であるトレハロース
の効果を調べるため、添加物質としてスキムミルクを用
いた比較例１及び２、添加物質なしの比較例３及び４、
さらに保存処理をしない場合を参考例１として併せて実
験を行った。EXAMPLES Examples 1 and 2, Comparative Examples 1 to 4 and Reference Example 1 In Examples 1 and 2, the effects of the present invention were obtained by using nitrifying sludge used for treating ammonia-containing wastewater as activated sludge. confirmed. Then, in order to examine the effect of trehalose as an additive, Comparative Examples 1 and 2 using skim milk as an additive, Comparative Examples 3 and 4 without an additive,
Further, an experiment was conducted together with the case where no preservation treatment was performed as Reference Example 1.
【００１３】硝化汚泥中には硝化細菌が存在し、排水中
のアンモニア及び亜硝酸を硝酸に酸化する働きを有す
る。電力排水処理装置から採取した硝化汚泥（汚泥濃度
２，０００ｍｇ／ｌ）１０ｍｌを遠心分離により回収し
た。回収した汚泥をトレハロース水溶液，スキムミルク
水溶液又は蒸留水（添加物質なし）のいずれか１ｍｌに
再懸濁し、凍結乾燥処理又は常圧乾燥処理を行った。ス
キムミルクは乾燥障害防止剤として、乾燥保存法の添加
物質として用いられる物質である。添加するトレハロー
ス水溶液の濃度は３．５％とし、スキムミルク水溶液の
濃度は、一般に微生物の保存に用いられる２０％とし
た。Nitrifying sludge contains nitrifying bacteria and has a function of oxidizing ammonia and nitrite in wastewater to nitric acid. 10 ml of nitrifying sludge (sludge concentration: 2,000 mg / l) collected from the electric power wastewater treatment device was collected by centrifugation. The collected sludge was resuspended in 1 ml of any of a trehalose aqueous solution, a skim milk aqueous solution, or distilled water (with no added substance), and subjected to a freeze-drying treatment or a normal-pressure drying treatment. Skim milk is a substance used as an additive for a dry preservation method as an agent for preventing drying disorders. The concentration of the trehalose aqueous solution to be added was 3.5%, and the concentration of the skim milk aqueous solution was 20%, which is generally used for storing microorganisms.
【００１４】実施例１，比較例１及び３で行った凍結乾
燥では、再懸濁した汚泥を冷凍庫（−８０℃）で予備凍
結し、凍結乾燥機を用いて凍結乾燥処理した。一方、実
施例２，比較例２及び４で行った常圧乾燥では、再懸濁
した汚泥をペトリ皿に移して、送風下で自然乾燥させ
た。凍結乾燥及び常圧乾燥を行った汚泥は、４℃で保存
した。乾燥処理後、３月間保存した汚泥の硝化活性を測
定し、乾燥処理を行っていない参考例１の未処理の汚泥
の活性と比較した。硝化活性の測定方法を以下に示す。In the freeze drying performed in Example 1 and Comparative Examples 1 and 3, the resuspended sludge was pre-frozen in a freezer (-80 ° C.) and freeze-dried using a freeze dryer. On the other hand, in the normal-pressure drying performed in Example 2 and Comparative Examples 2 and 4, the resuspended sludge was transferred to a Petri dish and air-dried under ventilation. The sludge that had been freeze-dried and dried under normal pressure was stored at 4 ° C. After the drying treatment, the nitrification activity of the sludge stored for 3 months was measured and compared with the activity of the untreated sludge of Reference Example 1 not subjected to the drying treatment. The method for measuring the nitrification activity is described below.
【００１５】凍結乾燥汚泥（実施例１，比較例１及び
３）、常圧乾燥汚泥（実施例２，比較例２及び４）及び
未処理の汚泥（参考例１）を、それぞれ１０ｍｌのアン
モニア含有水に再懸濁し、好気条件，２８℃で反応させ
た。アンモニア含有水は、アンモニア態窒素としてＮＨ
4 −Ｎを１５０〜１８０ｍｇ／ｌ、栄養素としてＮａＨ
ＣＯ3 を0.５ｇ／ｌ、Ｋ2 ＨＰＯ4 を0.０５ｇ／ｌ、Ｍ
ｇＳＯ4 ・７Ｈ2 Ｏを0.００１ｇ／ｌ、ＣａＣｌ2 ・２
Ｈ2 Ｏを0.００５ｇ／ｌ及びＮａＣｌを１５．３ｇ／ｌ
含む合成排水である。Each of the freeze-dried sludge (Example 1, Comparative Examples 1 and 3), the atmospheric pressure dried sludge (Example 2, Comparative Examples 2 and 4) and the untreated sludge (Reference Example 1) contains 10 ml of ammonia. It was resuspended in water and reacted at 28 ° C. under aerobic conditions. Ammonia-containing water is NH 3 as ammonia nitrogen.
150-180 mg / l of 4- N, NaH as a nutrient
CO 3 0.5 g / l, K 2 HPO 4 0.05 g / l, M
gSO 4 · 7H 2 O and 0.001g / l, CaCl 2 · 2
0.005 g / l of H 2 O and 15.3 g / l of NaCl
Synthetic wastewater containing.
【００１６】反応開始時（０時間）及び２０時間のアン
モニア濃度からアンモニア減少速度（硝化活性）を算出
し、保存汚泥の硝化活性を比較した。結果を表１に示
す。The ammonia reduction rate (nitrification activity) was calculated from the ammonia concentration at the start of the reaction (0 hour) and at 20 hours, and the nitrification activity of the stored sludge was compared. Table 1 shows the results.
【００１７】[0017]
【表１】 [Table 1]
【００１８】上記表１に示すように、トレハロースを添
加して乾燥処理を行った実施例１及び２の硝化汚泥で
は、凍結乾燥，常圧乾燥のいずれの場合にも、アンモニ
アの減少が見られ、硝化菌が活性を保持していることが
確認できた。これに対して、比較例１及び２のスキムミ
ルクを添加した汚泥、及び、比較例３及び４の何も添加
しなかった汚泥では、アンモニアの減少が見られず、硝
化菌の性能が失われていることがわかった。そして、ト
レハロースを添加した汚泥の硝化活性は、参考例１の未
処理の硝化汚泥の活性を１００としたとき、凍結乾燥汚
泥で約３５、常圧乾燥汚泥で約４５といずれも高レベル
の活性であった。以上の結果より、トレハロースを添加
した実施例１及び２では、活性を維持した状態で汚泥を
乾燥保存できることがわかった。As shown in Table 1, in the nitrified sludges of Examples 1 and 2 in which trehalose was added and dried, ammonia was reduced in both freeze-drying and normal-pressure drying. It was confirmed that the nitrifying bacteria retained the activity. On the other hand, in the sludge to which the skim milk of Comparative Examples 1 and 2 was added, and the sludge to which none of Comparative Examples 3 and 4 were added, no decrease in ammonia was observed, and the performance of nitrifying bacteria was lost. I knew it was there. The nitrification activity of the sludge to which trehalose was added was as high as about 35 for freeze-dried sludge and about 45 for normal-pressure dried sludge, where the activity of the untreated nitrified sludge of Reference Example 1 was 100. Met. From the above results, it was found that in Examples 1 and 2 to which trehalose was added, the sludge could be dried and stored while maintaining the activity.
【００１９】[0019]
【発明の効果】本発明は、排水処理に使用する活性汚泥
について、活性を維持したまま長期保存することができ
る。すなわち、本発明の活性汚泥の保存方法によれば、
トレハロースを添加することにより活性を維持した状態
で活性汚泥を乾燥保存できるようにしたので、活性低下
が少なく、保管・運搬に有利な状態で活性汚泥を保存す
ることができ、その産業上の意義は極めて大きい。According to the present invention, activated sludge used for wastewater treatment can be stored for a long time while maintaining its activity. That is, according to the method for storing activated sludge of the present invention,
By adding trehalose, activated sludge can be dried and stored while maintaining its activity, so that its activity is small and activated sludge can be stored in a state that is advantageous for storage and transportation, and its industrial significance. Is extremely large.
Claims (3)
処理して保存することを特徴とする活性汚泥の保存方
法。1. A method for storing activated sludge, comprising drying and storing activated sludge in the presence of trehalose.
は水溶液の状態で添加することを特徴とする請求項１記
載の活性汚泥の保存方法。2. The method for storing activated sludge according to claim 1, wherein the trehalose is added to the activated sludge in the form of a powder or an aqueous solution.
ースの濃度が、１重量％以上となるように添加すること
を特徴とする請求項２記載の活性汚泥の保存方法。3. The method for preserving activated sludge according to claim 2, wherein the concentration of the trehalose in the activated sludge after the drying treatment is added so as to be 1% by weight or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP822398A JP3556818B2 (en) | 1998-01-20 | 1998-01-20 | How to store activated sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP822398A JP3556818B2 (en) | 1998-01-20 | 1998-01-20 | How to store activated sludge |
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| JPH11197686A true JPH11197686A (en) | 1999-07-27 |
| JP3556818B2 JP3556818B2 (en) | 2004-08-25 |
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| JP822398A Expired - Fee Related JP3556818B2 (en) | 1998-01-20 | 1998-01-20 | How to store activated sludge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350037C (en) * | 2006-03-30 | 2007-11-21 | 山东大学 | Prodn. process of dry aerobic granulated sludge specially for degrading toxic organics |
| CN102680424A (en) * | 2011-03-17 | 2012-09-19 | 尹军 | Determination method for trehalose contentin activated sludge |
| WO2015145866A1 (en) * | 2014-03-27 | 2015-10-01 | 三菱重工業株式会社 | Laundry wastewater biological treatment preparation, and device and method for treating laundry wastewater by using same |
| WO2016092990A1 (en) * | 2014-12-11 | 2016-06-16 | 三菱重工業株式会社 | Process for producing freeze-dried sludge |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6716289B2 (en) * | 2016-03-03 | 2020-07-01 | 三菱重工業株式会社 | Wastewater treatment capacity improver, manufacturing method thereof, wastewater treatment method and wastewater treatment equipment |
-
1998
- 1998-01-20 JP JP822398A patent/JP3556818B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350037C (en) * | 2006-03-30 | 2007-11-21 | 山东大学 | Prodn. process of dry aerobic granulated sludge specially for degrading toxic organics |
| CN102680424A (en) * | 2011-03-17 | 2012-09-19 | 尹军 | Determination method for trehalose contentin activated sludge |
| WO2015145866A1 (en) * | 2014-03-27 | 2015-10-01 | 三菱重工業株式会社 | Laundry wastewater biological treatment preparation, and device and method for treating laundry wastewater by using same |
| JP2015188815A (en) * | 2014-03-27 | 2015-11-02 | 三菱重工業株式会社 | Biological treatment formulation for cleaning effluent, apparatus and method for treating cleaning effluent using the same |
| EP3098204A4 (en) * | 2014-03-27 | 2017-05-17 | Mitsubishi Heavy Industries, Ltd. | Laundry wastewater biological treatment preparation, and device and method for treating laundry wastewater by using same |
| US10259733B2 (en) | 2014-03-27 | 2019-04-16 | Mitsubishi Heavy Industries, Ltd. | Laundry wastewater biological treatment preparation, and device and method for treating laundry wastewater by using same |
| WO2016092990A1 (en) * | 2014-12-11 | 2016-06-16 | 三菱重工業株式会社 | Process for producing freeze-dried sludge |
| JP2016112481A (en) * | 2014-12-11 | 2016-06-23 | 三菱重工業株式会社 | Freeze-dried sludge production process |
| EP3168198A4 (en) * | 2014-12-11 | 2017-06-14 | Mitsubishi Heavy Industries, Ltd. | Process for producing freeze-dried sludge |
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| Publication number | Publication date |
|---|---|
| JP3556818B2 (en) | 2004-08-25 |
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