JPH054160B2 - - Google Patents
Info
- Publication number
- JPH054160B2 JPH054160B2 JP19517785A JP19517785A JPH054160B2 JP H054160 B2 JPH054160 B2 JP H054160B2 JP 19517785 A JP19517785 A JP 19517785A JP 19517785 A JP19517785 A JP 19517785A JP H054160 B2 JPH054160 B2 JP H054160B2
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- fermentation
- pulp
- 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.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 62
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 60
- 238000000855 fermentation Methods 0.000 claims description 57
- 230000004151 fermentation Effects 0.000 claims description 57
- 239000002699 waste material Substances 0.000 claims description 53
- 150000003464 sulfur compounds Chemical class 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000011282 treatment Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 25
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001447 alkali salts Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- -1 dimethyl disulfur Chemical compound 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000126 substance 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
- 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
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、クラフトパルプ製造工程におい
て、蒸解釜から出るブロー蒸気のコンデンセート
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
よる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] Industrial Application Field The present invention is used in the kraft pulp manufacturing process to condensate blown steam from a digester or condensate evaporated steam from a concentrator used to recover used cooking liquor. (Throughout this specification, these waste liquids are collectively referred to as pulp condensate waste liquid) by methane fermentation. This relates to a pretreatment method that must be adjusted.
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
ルジ硫黄などの多量の臭気成分（総硫黄分として
200〜4000ppm）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
2000〜12000ppm）を含む廃液であつて、パルプ
製造の全廃液の10〜30％の割合を占める。したが
つて同廃液は有機汚濁物の発生源となつており、
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 (as a total sulfur content) such as hydrogen sulfide, methyl mercaptan, dimethyl sulfur, and dimethyl disulfur.
200 to 4000 ppm) and a large amount of organic components, mainly methanol (as measured by COD).
2,000 to 12,000 ppm), which accounts for 10 to 30% of the total waste liquid from pulp manufacturing. Therefore, the waste liquid is a source of organic pollutants.
There is a strong need for an effective treatment method.
従来、パルプコンデンセート廃液は、その臭気
対策を主眼とし、スチームストリツピングやエア
ストリツピングなどで処理され、ストリツピング
された臭気成分は燃焼処理され、ストリツピング
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, pulp condensate waste liquid has been treated with steam stripping, air stripping, etc. with the focus on odor control, the stripped odor components are treated by combustion, and the stripping residual liquid is subjected to the activated sludge method. The organic components inside had been treated.
しかし、蒸気処理はいずれもストリツピング操
作であるため、高価な蒸気を消費し、またエアス
トリツピングにおいてはエア供給用コンプレツサ
の駆動電力を消費し、処理コストがはなはだ高く
つくうらみがあつた。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つ
た。 However, since all steam treatments involve stripping operations, expensive steam is consumed, and air stripping consumes electric power to drive the air supply compressor, making treatment costs extremely high. Moreover, with this processing method,
Despite the high costs mentioned above,
No useful by-products were obtained.
そこで本発明者らは、パルプコンデンセート廃
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 if pulp condensate waste liquid was treated by methane fermentation, useful methane could be generated without consuming expensive steam or electricity. .
一般にパルプ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、PH9.5〜10.5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, pulp 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, so it exhibits alkalinity with a pH of 9.5 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℃、PH5.2〜6.3であ
る。 On the other hand, methane fermentation is carried out using bacteria that utilize methanol, and the preferred fermentation conditions for this bacteria are a temperature of 30 to 40°C and a pH of 5.2 to 6.3.
したがつてパルプ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, pulp condensate waste liquid cannot be directly subjected to methane fermentation, and it is necessary to adjust its pH value to an optimal 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つて行な
つたのでは処理コストの節減が果たせず、また酸
性廃液の添加によつ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 is not possible to reduce the processing cost, and if the pH value is adjusted by adding an acidic waste liquid, the substances contained therein act as inhibitors of fermentation. I'm jealous.
この発明は、上記のような実情に鑑みて創案せ
られ、コスト的に有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スコン
デンセー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 an object of the present invention is to provide a method for treating pulse condensate waste liquid that can be carried out cost-effectively and efficiently generate useful by-products.
問題点の解決手段
この発明は、パルプ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、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
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 Problems This invention, when treating pulp condensate waste liquid by methane fermentation, brings the fermentation gas generated by methane fermentation into direct contact with the waste liquid before treatment to adjust the properties of the waste liquid to be suitable for methane fermentation. It's a method.
すなわち、この発明は、アルカリ性のパルプコ
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 the fermentation gas to neutralize alkaline pulp 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.
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℃、PH
5.2〜6.3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 a temperature of 30 to 40°C, a pH of
It is 5.2-6.3. The fermentation gas produced by methane fermentation contains carbon dioxide in addition to methane.
この発明の前処理によつて、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
の含有量は総硫黄成分として350ppm以下に低減
される。そして発酵の結果、パルプコンデンセー
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。 By the pretreatment of this invention, the pH of the waste liquid is usually reduced to
The content of sulfur compounds in the waste liquid is reduced to 350 ppm or less as a total sulfur component. As a result of fermentation, 85 to 95% of the organic components in the pulp condensate waste liquid are converted into fermentation gas, and the obtained fermentation gas is effectively used as fuel.
またこの発明の好ましい実施態様においては、
発酵ガスと廃液の接触の前に、廃液に酸またはア
ルカリが添加されて、廃液のアルカリ度が発酵に
適した範囲に調整される。酸としては塩酸や硫酸
などが用いられ、アルカリとしてはＫ、Naのよ
うなアルカリ金属ないしCa、Mgのようなアルカ
リ土類金属の水酸化物ないし炭酸塩などが用いら
れる。 In a preferred embodiment of this invention,
Before contacting the fermentation gas with the waste liquid, an acid or alkali is added to the waste liquid to adjust the alkalinity of the waste liquid to a range suitable for fermentation. Hydrochloric acid, sulfuric acid, etc. are used as the acid, and hydroxides or carbonates of alkali metals such as K and Na, or alkaline earth metals such as Ca and Mg are used as the alkali.
発明の作用効果
この発明によれば、パルプ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、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、アルカリ性のパルプコンデンセート
廃液を発酵ガス中の二酸化炭素の吸収により中和
し、かつ同廃液中の発酵阻害成分を同ガス中のメ
タンによつて同ガス中に移行させることができ
る。したがつてこの発明によれば、パルプコンデ
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 pulp condensate waste liquid is treated by methane fermentation, the fermentation gas generated by methane fermentation is brought into direct contact with the waste liquid before treatment, so that the alkaline pulp condensate waste liquid is removed from the fermentation gas. It is neutralized by absorption of carbon dioxide, and the fermentation-inhibiting components in the waste liquid can be transferred into the gas by the methane in the gas. Therefore, according to the present invention, the pulp condensate waste liquid can be adjusted in advance to properties suitable for methane fermentation before the waste liquid is treated by methane fermentation, and as a result, the waste liquid treatment can be made cost-effective. In addition to being practical, it is possible to efficiently produce 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.
実施例 １
第１図において、PH10のパルプコンデンセート
廃液はライン１によつてスクラバー２に供給さ
れ、ここでライン３によつ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PH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。こうしてパルプコンデンセート
廃液は発酵ガスによつて前処理される。Example 1 In FIG. 1, pulp condensate waste with a pH of 10 is fed by line 1 to a scrubber 2 where it is brought into direct contact with the fermentation gas conducted by line 3. As a result, the waste liquid absorbs carbon dioxide in the fermentation gas and is neutralized, resulting in a pH value of 6.
It will be ~7. In addition, sulfur compounds in the waste liquid are transferred into the fermentation gas by methane and removed from the waste liquid. The pulp condensate waste liquid 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によつて冷却器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によつて前処理後の廃液に
加えられる。ついで発酵ガスは必要に応じて脱硫
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。 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 via a line 15 to the cooler 4;
Here, the entrained water vapor is condensed and removed. The resulting condensed water is then added via line 5 to the pretreated waste liquid. The fermentation gas is then desulfurized if necessary, and then effectively used as fuel for boilers and incinerators.
他方、前処理後のパルプコンデンセート廃液
は、ライン６によつてスクラバー２からシールタ
ンク７に送られ、さらにライン８によつて混合槽
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１
２によつて送られる。そして同槽１０内の液全体
が攪拌器９によつて混合される。 On the other hand, the pretreated pulp condensate waste liquid is sent from the scrubber 2 to the seal tank 7 via line 6, and further sent to the mixing tank 10 via line 8. Nutrients necessary for fermentation such as nitrogen and phosphorus are added to the tank 10 from a line 11, and return liquid from a fermentation tank 14, which will be described later, is added to the line 11.
Sent by 2. Then, the entire liquid in the tank 10 is mixed by 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によつて発酵槽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。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
つて発酵処理液からストリツピングせられる。し
たがつてライン１７によつて発酵槽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 by a line 16 with a pump 13 to a fermenter 14, where it is 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 gas. Further, 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 17 has no odor caused by sulfur compounds.
発酵槽１４で発生した発酵ガスはライン１８に
よつてシールタンク７に送られ、ついで前述した
ようにライン３によつてスクラバー２に導かれ、
パルプコンデンセート廃液との直接接触に供され
る。 The fermentation gas generated in the fermenter 14 is sent to the seal tank 7 via line 18 and then guided to the scrubber 2 via line 3 as described above.
Subjected to direct contact with pulp condensate 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つて液中のCO3 --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、常に一定量が循環するように
なされている。したがつてメタン発酵に大きく影
響するPH値、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 CO 3 -- or CO 3 in the liquid depending on the conditions.
It takes the form of anions such as HCO 3 - and the gas form of fermentation gas, and a constant amount is always circulated. Therefore, it becomes easy to maintain constant fermentation conditions such as pH value and alkalinity, which greatly affect methane fermentation, and stable operation of the device 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パルプコンデンセ
ート廃液と合流してスクラバー２に供給し、発酵
槽１４とスクライバー２の間に液循環ループを構
成してもよい。 In addition, in this embodiment, the mixing tank 10 and the fermentation tank 14
A liquid circulation loop is constructed between the fermenter 14 and the scriber 2, where the treated liquid from the fermenter 14 is combined with the unprocessed pulp condensate waste liquid and supplied to the scrubber 2. may be configured.
実施例 ２
第２図において、パルプコンデンセート廃液
は、スクライバー２に供給される前に、ライン２
６によつてアルカリ度調整槽２５に導入され、こ
こでライン２７から来る酸またはアルカリ液と混
合され、同廃液のアルカリ度が調整される。酸と
しては塩酸や硫酸などが用いられ、アルカリとし
てはＫ、Naのようなアルカリ金属ないしCa、
Mgのようなアルカリ土類金属の水酸化物ないし
炭酸塩などが用いられる。Example 2 In FIG. 2, the pulp condensate waste liquid is passed through the line 2
6 into the alkalinity adjustment tank 25, where it is mixed with the acid or alkali liquid coming from the line 27, and the alkalinity of the waste liquid is adjusted. The acids used include hydrochloric acid and sulfuric acid, and the alkalis include alkali metals such as K and Na, Ca,
Hydroxides or carbonates of alkaline earth metals such as Mg are used.
この実施例は、パルプコンデンセート廃液中の
アルカリ金属またはアルカリ土類金属の水酸化
物、炭酸塩等のアルカリ度寄与成分の濃度を調整
して、後続の発酵工程におけるアルカリ度を発酵
に適した範囲に予備調整しておくために、特に有
効に実施される。以降は実施例１と同じに処理さ
れる。 In this example, the concentration of alkalinity contributing components such as alkali metal or alkaline earth metal hydroxides and carbonates in the pulp condensate waste liquid is adjusted to maintain the alkalinity in the subsequent fermentation process within a range suitable for fermentation. This is particularly effective for making preliminary adjustments. The subsequent processing is the same as in the first embodiment.
第１図および第２図はこの発明の実施例を示す
フローシートである。
FIGS. 1 and 2 are flow sheets showing an embodiment of the present invention.
Claims (1)
り処理するに当り、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て、廃液をメ
タン発酵に適した性状に調整する方法。 ２ 前記性状が、廃液のPHが4.5〜8.1の範囲であ
り、廃液中の硫黄化合物の含有量が総硫黄分とし
て350ppm以下である、特許請求の範囲第１項記
載の方法。 ３ 発酵ガスと廃液の接触の前に、廃液に酸また
はアルカリを添加して、廃液のアルカリ度を発酵
に適した範囲に調整する、特許請求の範囲第１ま
たは２項記載の方法。[Scope of Claims] 1. A method in which pulp condensate waste liquid is treated by methane fermentation, in which fermentation gas generated by methane fermentation is brought into direct contact with the waste liquid before treatment to adjust the properties of the waste liquid to be suitable for methane fermentation. 2. The method according to claim 1, wherein the property is that the pH of the waste liquid is in the range of 4.5 to 8.1, and the content of sulfur compounds in the waste liquid is 350 ppm or less as a total sulfur content. 3. The method according to claim 1 or 2, wherein before the fermentation gas and the waste liquid come into contact, an acid or alkali is added to the waste liquid to adjust the alkalinity of the waste liquid to a range suitable for fermentation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60195177A JPS6253795A (en) | 1985-09-03 | 1985-09-03 | Treatment of pulp condensate waste liquid by methane fermentation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60195177A JPS6253795A (en) | 1985-09-03 | 1985-09-03 | Treatment of pulp condensate waste liquid by methane fermentation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6253795A JPS6253795A (en) | 1987-03-09 |
| JPH054160B2 true JPH054160B2 (en) | 1993-01-19 |
Family
ID=16336725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60195177A Granted JPS6253795A (en) | 1985-09-03 | 1985-09-03 | Treatment of pulp condensate waste liquid by methane fermentation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6253795A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03137994A (en) * | 1989-10-23 | 1991-06-12 | Akua Runesansu Gijutsu Kenkyu Kumiai | Treatment of wastewater containing sulfur compound |
| JP2006320844A (en) * | 2005-05-19 | 2006-11-30 | Japan Organo Co Ltd | Method and apparatus for treating waste water |
| JP2007319842A (en) * | 2006-06-05 | 2007-12-13 | Sumitomo Heavy Industries Environment Co Ltd | Method for removing odor of effluent and apparatus therefor |
| JP2011200792A (en) * | 2010-03-25 | 2011-10-13 | Kobelco Eco-Solutions Co Ltd | Apparatus and method for anaerobic treatment |
| JP5471748B2 (en) * | 2010-04-09 | 2014-04-16 | 株式会社Ｉｈｉ | Anaerobic treatment facility and anaerobic treatment method |
| JP5781874B2 (en) * | 2011-09-14 | 2015-09-24 | 水ｉｎｇ株式会社 | Method and apparatus for anaerobic treatment of pulp mill wastewater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60195178A (en) * | 1984-03-16 | 1985-10-03 | Yoshinari Masuyama | Anti-freeze and dust-preventing agent |
-
1985
- 1985-09-03 JP JP60195177A patent/JPS6253795A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60195178A (en) * | 1984-03-16 | 1985-10-03 | Yoshinari Masuyama | Anti-freeze and dust-preventing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6253795A (en) | 1987-03-09 |
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