JPS6257696A - Treatment by methane fermentation of waste liquid of pulp condensate - Google Patents
Treatment by methane fermentation of waste liquid of pulp condensateInfo
- Publication number
- JPS6257696A JPS6257696A JP60195179A JP19517985A JPS6257696A JP S6257696 A JPS6257696 A JP S6257696A JP 60195179 A JP60195179 A JP 60195179A JP 19517985 A JP19517985 A JP 19517985A JP S6257696 A JPS6257696 A JP S6257696A
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- fermentation
- gas
- methane
- condensate
- 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
- 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
この発明は、クラ７１へパルプ！ｌｌ造工程において、
蒸解釜から出るブロー蒸気のコンデンセー１〜や、使用
済み蒸解液の回収に使用される濃縮装置から出る蒸発蒸
気のコンデンセートなどの廃液（この明細書全体を通し
て、これら廃液をパルプコンデンセート廃液と総称する
）をメタン発酵により処理する方法に関し、さらに詳し
くは、同廃液処理の前に予め同廃液をメタン発酵に適し
た性状に調整しておく前処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is applicable to Kula 71 Pulp! In the manufacturing process,
Waste liquids such as blown vapor condensate 1~ from the digester and evaporated vapor condensate from the concentrator used to recover used cooking liquor (throughout this specification, these waste liquids are collectively referred to as pulp condensate waste liquid) The present invention relates to a method for treating waste liquid by methane fermentation, and more specifically, to a pretreatment method in which the waste liquid is adjusted in advance to properties suitable for methane fermentation before the waste liquid is treated.
従来技術およびその問題点
一般に、パルプコンデンセート廃液は、硫化水素、メチ
ルメルカプタン、ジメチル硫黄、ジメチル硫黄などの多
量の臭気成分（総硫黄弁として２００〜４０００１）Ｉ
）Ｉｎ）を含み、かつメタノールを主成分とする多量の
有機成分（ＣＯＤ測定値として２０００〜１２０００ｐ
ｐｍ）を含む廃液であって、バルブ製造の全廃液の１０
〜３０％の割合を占める。したがって同廃液は右機汚濁
物の発生源となっており、−その有効な処理方法が切望
されている。Prior art and its problems In general, pulp condensate waste liquid contains a large amount of odor components such as hydrogen sulfide, methyl mercaptan, dimethyl sulfur, and dimethyl sulfur (200 to 40,000 l as total sulfur valve).
) In) and a large amount of organic components mainly composed of methanol (2000 to 12000 p as COD measurement value)
10% of the total wastewater from valve manufacturing.
It accounts for ~30%. Therefore, this waste liquid is a source of right machine pollutants, and an effective treatment method is desperately needed.
従来、バルブコンデンセート廃液は、その臭気対策を主
眼とし、スチームストリッピングやエアストリッピング
などで処理され、ストリッピングされた臭気成分は燃焼
処理され、ストリッピング残留液は活性汚泥法に付され
て、その中の有機成分が処理されていた。Conventionally, valve condensate waste liquid has been treated with steam stripping, air stripping, etc., with the main focus on odor control, the stripped odor components are treated by combustion, and the stripped residual liquid is subjected to an activated sludge method. The organic components inside had been treated.
しかし、上記処理はいずれもストリッピング操作である
ため、高価な蒸気を消費し、またエアストリッピングに
おいてはエア供給用コンプレッサの駆動電力を消費し、
処理コストがはなはだ高くつくうらみがあった。しかも
この処理方法では、上記のように高い出費が必要である
にも拘らず、それに見合う有用な副産物は何も得られな
かった。However, since all of the above processes are stripping operations, they consume expensive steam, and air stripping consumes power to drive the air supply compressor.
There was a concern that processing costs would be extremely high. Moreover, this treatment method did not yield any useful by-products commensurate with the high expenditures mentioned above.
そこで本発明者らは、パルブコンデンセー１−廃液をメ
タン発酵により処理すれば、高価な蒸気や電力を消費す
ることなく、有用なメタンを生成することができるとい
う着想のもとに、種々検討を重ねた。Therefore, the present inventors conducted various studies based on the idea that useful methane could be produced without consuming expensive steam or electricity by treating pulp condensate 1 waste liquid by methane fermentation. layered.
一般にバルブコンデンセート廃液は蒸解液蒸発時の飛沫
同伴に由来するアルカリ成分を含み、また硫化水素など
の硫黄化合物をアルカリ塩として含むため、ａｌ１９．
５〜１０．５のアルカリ性を示す。またこれらアルカリ
成分ないしアルカリ塩や硫黄化合物はメタン発酵に対し
阻害成分として作用する。In general, valve condensate waste liquid contains alkaline components derived from droplets entrained during evaporation of cooking liquor, and also contains sulfur compounds such as hydrogen sulfide as alkali salts.
Shows alkalinity of 5 to 10.5. Furthermore, these alkaline components, alkali salts, and sulfur compounds act as inhibitory components for methane fermentation.
他方、メタン発酵はメタノールを資化するバクテリアを
用いて行なわれ、このバクテリアの好ましい発酵条件は
、温度３０〜４０℃、ｐＨ５。On the other hand, methane fermentation is carried out using bacteria that assimilate methanol, and the preferred fermentation conditions for this bacteria are a temperature of 30 to 40°C and a pH of 5.
２〜６．３である。It is 2 to 6.3.
したがってバルブコンデンセート廃液を直接メタン発酵
に付すことはできず、予めそのｐＨ値をメタン発酵の至
適範囲に調整し、かつ阻害成分を除去しておく必要があ
る。Therefore, the valve condensate waste liquid cannot be directly subjected to methane fermentation, and it is necessary to adjust its pH value to an optimum range for methane fermentation in advance and to remove inhibiting components.
ただしｐＨ値の調整を中和剤の添加によって行なったの
では処理コス１〜の節減が果たせず、また酸性廃液の添
加によった場合にはその含有物質がやはり発酵の阻害成
分として作用するうらみがある。However, if the pH value is adjusted by adding a neutralizing agent, it will not be possible to reduce the processing cost by 1 or more, and if acidic waste liquid is added, the substances contained therein will still act as fermentation inhibiting components. There is.
この発明は、上記のような実情に鑑みて創案せられ、ロ
ス１〜的に右利に実施できしかも有用な副産物を効率よ
く生成することのできるパルブコンデンし−ト廃液の処
理方法を提供することを目的とする。The present invention was devised in view of the above-mentioned circumstances, and provides a method for treating pulp condensate waste liquid that can be carried out to reduce losses and efficiently generate useful by-products. With the goal.
問題点の解決手段
この発明は、パルブコンデンレー１〜廃液をメタン発酵
により処理するに当り、処理前の廃液をまず二酸化炭素
ないし煙道ガスのような二酸化炭素含有ガスに直接接触
させ、ついでメタン発酵により生じた発酵ガスに直接接
触させて、廃液をメタン発酵に適した性状に調整する方
法である。Means for Solving the Problems This invention provides a method for treating waste liquid from pulp condensate 1 through methane fermentation, by first bringing the waste liquid before treatment into direct contact with carbon dioxide or a carbon dioxide-containing gas such as flue gas, and then exposing it to methane. This is a method of adjusting the properties of waste liquid to be suitable for methane fermentation by bringing it into direct contact with the fermentation gas produced by fermentation.
すなわち、この発明は、アルカリ性のバルブコンデンセ
ート廃液の中和に発酵ガス中の二酸化炭素を使用し、か
つ同廃液中の発酵阻害成分の除去に同ガス中のメタンを
使用して、メタン発酵によるパルプコンデンセート廃液
処理の前に、予め同廃液をメタン発酵に適した性状に調
整しておくものである。That is, this invention uses carbon dioxide in fermentation gas to neutralize alkaline valve condensate waste liquid, and uses methane in the gas to remove fermentation-inhibiting components in the waste liquid, thereby producing pulp by methane fermentation. Before processing condensate waste liquid, the waste liquid is adjusted in advance to properties suitable for methane fermentation.
この発明は、バルブコンデンセート廃液のアルカリ成分
含有量が多い場合に、特に有効に実施される。This invention is particularly effectively carried out when the valve condensate waste liquid has a high alkaline component content.
メタン発酵は、上述のとおり、メタノールを資化するバ
クテリアを用いて行なわれ、このバクテリアの好ましい
発酵条件は、温度３０〜４０℃、１）１１５．２〜６．
３である。そしてメタン発酵により生じた発酵ガスはメ
タンのほかに二酸化炭素を含む。As mentioned above, methane fermentation is carried out using bacteria that assimilate methanol, and the preferred fermentation conditions for this bacteria are: temperature 30-40°C, 1) 115.2-6.
It is 3. The fermentation gas produced by methane fermentation contains carbon dioxide in addition to methane.
この発明に前処理によって、通常、廃液のｐＨは４．５
〜８．１の範囲に調整され、廃液中の硫黄化合物の含有
間は総硫黄分として３５０ＦＩＤｍ以下に低減される。By pre-treatment in this invention, the pH of the waste liquid is usually 4.5.
-8.1, and the content of sulfur compounds in the waste liquid is reduced to 350 FIDm or less as a total sulfur content.
そして発酵の結果、バルブコンデンセート廃液中の有機
成分の８５〜９５％が発酵ガスに変換され、得られた発
酵ガスは燃料として有効に利用される。As a result of fermentation, 85 to 95% of the organic components in the valve condensate waste liquid are converted into fermentation gas, and the obtained fermentation gas is effectively used as fuel.
発明の作用効果
この発明によれば、バルブコンデンセート廃液をメタン
発酵により処理するに当り、処理前の廃液をまず二酸化
炭素ないし煙道ガスのような二酸化炭素含有ガスに直接
接触させ、ついでメタン発酵により生じた発酵ガスを処
理前の廃液に直接接触させるので、アルカリ性のバルブ
コンデンセート廃液を二酸化炭素の吸収により中和し、
かつ同廃液中の発′ＭｌｌＩｌ害成分を同ガス中のメタ
ンによって同ガス中に移行させることができる。したが
ってこの発明によれば、バルブコンデンセート廃液をそ
のメタン発酵による廃液処理の前に、予めメタン発酵に
適した性状に調整しておくことができ、その結果上記廃
液処理をコスト的に有利に実施できる上に、燃料として
有効利用できる副産物すなわちメタンガス含有発酵ガス
を効率よく生成することができる。Effects of the Invention According to the present invention, when treating valve condensate waste liquid by methane fermentation, the waste liquid before treatment is first brought into direct contact with carbon dioxide or a carbon dioxide-containing gas such as flue gas, and then the waste liquid is brought into direct contact with carbon dioxide or a carbon dioxide-containing gas such as flue gas. Since the generated fermentation gas is brought into direct contact with the waste liquid before treatment, the alkaline valve condensate waste liquid is neutralized by absorption of carbon dioxide.
In addition, the harmful components generated in the waste liquid can be transferred into the gas by the methane in the gas. Therefore, according to the present invention, the properties of the valve condensate waste liquid can be adjusted in advance to be suitable for methane fermentation before the waste liquid treatment by methane fermentation, and as a result, the waste liquid treatment can be carried out cost-effectively. Moreover, it is possible to efficiently generate a by-product, ie, methane gas-containing fermentation gas, which can be effectively used as a fuel.
実 施 例
以下、この発明の実施例について図面に基づいて具体的
に説明する。Embodiments Hereinafter, embodiments of the present invention will be specifically described based on the drawings.
図面において、ｐ）１１０を超えるバルブコンデンセー
ト廃液は、まずライン（１９）によって予備スクラバー
（２０）に導入されて、ここでライン（２１）から来る
二酸化炭素、煙道ガスなどと直接接触される。ついで同
廃液はライン（２２）によって廃液タンク（２３）に送
られ、ここからポンプ（２４）を有するライン（１）に
ｊ：ってスクラバー（２）に送られ、ここでライン（３
）によって導かれた発酵ガスと直接接触される。その結
果、同廃液は発酵ガス中の二酸化炭素を吸収して中和さ
れ、その閣値は６〜７になる。また同廃液中の硫黄化合
物は、発酵ガス中のメタンにより同ガス中に移行され、
廃液から除去される。こうしてバルブコンデンセート廃
液は発酵ガスによっ（前処理される。In the figure, the valve condensate effluent above p) 110 is first introduced by line (19) into the pre-scrubber (20) where it is brought into direct contact with carbon dioxide, flue gas etc. coming from line (21). The waste liquid is then sent by line (22) to a waste tank (23) and from there into line (1) with a pump (24) to a scrubber (2), where it is sent to a scrubber (2) where it is pumped into line (3).
) is brought into direct contact with the fermentation gases guided by the As a result, the waste liquid absorbs carbon dioxide in the fermentation gas and is neutralized, resulting in a value of 6 to 7. In addition, sulfur compounds in the waste liquid are transferred into the fermentation gas by methane,
removed from waste fluid. The valve condensate waste is thus pretreated with fermentation gas.
発酵ガスはスクラバー（２）において二酸化炭素を除去
されかつ硫黄化合物を吸収した後、スクラバー（２）か
らライン（１５）によって冷却器（４）に送られ、ここ
で同伴水蒸気が凝縮除去される。そして、生じた凝縮水
はライン（５）によって前処理後の廃液に加えられる。After the fermentation gas has been stripped of carbon dioxide and absorbed sulfur compounds in the scrubber (2), it is sent from the scrubber (2) by line (15) to the cooler (4), where the entrained water vapor is condensed out. The resulting condensed water is then added to the pretreated waste liquid via line (5).
ついで発酵ガスは必要に応じて＋１５２硫処理された後
、ボイラや焼却炉の燃料として有効利用される。The fermentation gas is then treated with +152 sulfur if necessary, and then effectively used as fuel for boilers and incinerators.
他方、前処理後のバルブコンデンセート廃液は、ライン
（６）によってスクラバー（２）からシールタンク（７
）に送られ、さらにライン（８）によって混合槽（１０
）に送られる。同槽（１０）にはライン（１１）から窒
素、燐などの発酵に必要な栄養剤が添加され、さらに後
述する発酵槽（１４）からの戻り液がライン（１２）に
よって送られる。そして同槽（１０）内の液全体が撹拌
器（９）にＪ−って混合される。On the other hand, the pretreated valve condensate waste is transferred from the scrubber (2) to the seal tank (7) via the line (6).
) and is further sent to the mixing tank (10
) will be sent to. Nutrients necessary for fermentation, such as nitrogen and phosphorus, are added to the tank (10) through a line (11), and a return liquid from a fermentation tank (14), which will be described later, is sent through a line (12). Then, the entire liquid in the tank (10) is mixed in the stirrer (9).
混合液は混合槽（１０）からポンプ（１３）を有するラ
イン（１６）によって発酵槽（１４）に送られ、所要発
酵条件下でメタン発酵に付される。この結果パルプコン
デンセート廃液中の有機成分の９０％がメタンガスに変
換される９、また前処理後もなお廃液中に残存した硫黄
化合物は、生成したメタンガスによって発酵処理液から
ストリッピングＵられる。したがってライン（１１）に
よって発酵槽（１４）から出た処理液は、硫黄化合物に
起因する臭気を全く感じさせない。The mixed liquid is sent from the mixing tank (10) to the fermenter (14) by a line (16) having a pump (13) and subjected to methane fermentation under the required fermentation conditions. As a result, 90% of the organic components in the pulp condensate waste liquid are converted to methane gas9, and the sulfur compounds remaining in the waste liquid even after the pretreatment are stripped from the fermentation liquid by the generated methane gas. Therefore, the treated liquid discharged from the fermenter (14) through the line (11) does not have any odor caused by sulfur compounds.
発酵４ｆｌ （１４）で発生した発酵ガスはライン（１
８）によってシールタンク（１）に送られ、ついで前述
したようにライン（３）によってスクラバー（２）に導
かれ、パルブコンデンｔ？−１−廃液との直接接触に供
される。The fermentation gas generated in the fermentation 4 fl (14) is transferred to the line (1
8) to the seal tank (1) and then, as mentioned above, guided by the line (3) to the scrubber (2) where the pulp condensate t? -1- Subjected to direct contact with waste liquid.
この実施例ではスクラバー（２）と発酵槽（１４）の間
に閉ループが構成されているので、同ループ内において
炭酸ガスは条件によって液中のＣＯ３−一やＨＣＯ３−
のような陰イオンの形態と発酵ガス中のガス形態とをと
り、常に一定間が循環するようになされている。したが
ってメタン発酵に大きく影響するｐ１１＠、アルカリ度
などの発酵条件を常に一定に保持することが容易となり
、装置の安定運転がなされる。In this embodiment, a closed loop is constructed between the scrubber (2) and the fermenter (14), so within the loop, carbon dioxide gas is converted to CO3-1 or HCO3-1 in the liquid depending on the conditions.
It takes the form of anions such as , and the form of gas in fermentation gas, and a certain amount of time is constantly circulated. Therefore, it becomes easy to maintain constant fermentation conditions such as p11@ and alkalinity, which greatly affect methane fermentation, and stable operation of the apparatus is achieved.
なお、この実施例では混合槽（１０）と発酵槽（１４）
の間に液循環ループが構成されているが、発酵槽（１４
）から出た処理液を処理前のバルブコンデンセート廃液
と合流してスクラバー（２）に供給し、発酵槽（１４）
とスクラバー（２）の間に液循環ループを構成してもよ
い。In addition, in this example, a mixing tank (10) and a fermentation tank (14)
A liquid circulation loop is constructed between the fermenters (14
) is combined with the valve condensate waste liquid before treatment, and is supplied to the scrubber (2), and then to the fermenter (14).
A liquid circulation loop may be configured between the scrubber and the scrubber (2).
図面はこの発明の実施例を示すフローシートである。 以上 The drawing is a flow sheet showing an embodiment of the invention. that's all
Claims (1)
に当り、処理前の廃液をまず二酸化炭素ないし煙道ガス
のような二酸化炭素含有ガスに直接接触させ、ついでメ
タン発酵により生じた発酵ガスに直接接触させて、廃液
をメタン発酵に適した性状に調整する方法。In treating pulp condensate waste liquid by methane fermentation, the waste liquid before treatment is first brought into direct contact with carbon dioxide or a carbon dioxide-containing gas such as flue gas, and then brought into direct contact with fermentation gas generated by methane fermentation. A method of adjusting waste liquid to properties suitable for methane fermentation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60195179A JPS6257696A (en) | 1985-09-03 | 1985-09-03 | Treatment by methane fermentation of waste liquid of pulp condensate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60195179A JPS6257696A (en) | 1985-09-03 | 1985-09-03 | Treatment by methane fermentation of waste liquid of pulp condensate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6257696A true JPS6257696A (en) | 1987-03-13 |
| JPH0462799B2 JPH0462799B2 (en) | 1992-10-07 |
Family
ID=16336762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60195179A Granted JPS6257696A (en) | 1985-09-03 | 1985-09-03 | Treatment by methane fermentation of waste liquid of pulp condensate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6257696A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011218298A (en) * | 2010-04-09 | 2011-11-04 | Ihi Corp | Anaerobic treatment facility and anaerobic treatment method |
| JP2014030827A (en) * | 2013-11-21 | 2014-02-20 | Ihi Corp | Anaerobic treatment facility and anaerobic treatment method |
-
1985
- 1985-09-03 JP JP60195179A patent/JPS6257696A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011218298A (en) * | 2010-04-09 | 2011-11-04 | Ihi Corp | Anaerobic treatment facility and anaerobic treatment method |
| JP2014030827A (en) * | 2013-11-21 | 2014-02-20 | Ihi Corp | Anaerobic treatment facility and anaerobic treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0462799B2 (en) | 1992-10-07 |
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