JP3050430B2 - Membrane treatment method for organic acid-containing fermentation waste liquid - Google Patents
Membrane treatment method for organic acid-containing fermentation waste liquidInfo
- Publication number
- JP3050430B2 JP3050430B2 JP3249691A JP24969191A JP3050430B2 JP 3050430 B2 JP3050430 B2 JP 3050430B2 JP 3249691 A JP3249691 A JP 3249691A JP 24969191 A JP24969191 A JP 24969191A JP 3050430 B2 JP3050430 B2 JP 3050430B2
- Authority
- JP
- Japan
- Prior art keywords
- membrane
- waste liquid
- organic acid
- containing fermentation
- fermentation waste
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、有機酸含有発酵廃液の
膜処理方法に関し、詳しくは、有機酸含有発酵廃液に含
まれる有機酸を膜によつて阻止して、透過液中の有機酸
濃度を低減する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating an organic acid-containing fermentation effluent with a membrane, and more particularly, to a method for preventing an organic acid contained in an organic acid-containing fermentation effluent by a membrane to prevent the organic acid contained in the permeated liquid. It relates to a method for reducing the concentration.
【０００２】[0002]
【従来の技術】発酵廃液は、従来、蒸発法によつて濃縮
し、その濃縮液を肥料として利用する一方、蒸留液は活
性汚泥処理した後、河川等に放流されている。しかし、
このような発酵廃液の処理方法によれば、廃液を蒸発さ
せるときに悪臭を生じるのみならず、エネルギー消費が
大きいという問題がある。そこで、従来から、かかる発
酵廃液を膜によつて処理する方法が種々提案されている
ものの、いずれの方法も低分子量の有機酸に由来するＢ
ＯＤ阻止率が低い。従つて、発酵廃液の膜処理の実用化
のためには、この点の改善が急務とされている。2. Description of the Related Art Conventionally, fermentation waste liquid has been concentrated by an evaporation method, and the concentrated liquid is used as fertilizer. On the other hand, distillate has been subjected to activated sludge treatment and then discharged to rivers and the like. But,
According to such a method for treating fermentation waste liquid, there is a problem that not only a bad odor is generated when the waste liquid is evaporated, but also energy consumption is large. Therefore, although various methods for treating such fermentation waste liquor with a membrane have been conventionally proposed, all of the methods are based on B originating from a low molecular weight organic acid.
Low OD rejection. Therefore, improvement of this point is urgently required for practical use of membrane treatment of fermentation waste liquid.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、従来の発酵
廃液の膜処理における上記した問題を解決するためにな
されたものであつて、発酵廃液に含まれる有機酸を有効
に阻止して、膜透過液中の有機酸濃度を大幅に低減し得
る方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional membrane treatment of fermentation waste liquor, and effectively inhibits organic acids contained in the fermentation waste liquor. It is an object of the present invention to provide a method capable of greatly reducing the concentration of an organic acid in a membrane permeate.
【０００４】[0004]
【課題を解決するための手段】本発明による有機酸含有
発酵廃液の膜処理方法は、有機酸含有発酵廃液の膜処理
方法において、有機酸含有発酵廃液のpHを６以上に調整
して膜処理することを特徴とする。本発明において、有
機酸含有発酵廃液とは、廃糖蜜等を主原料として酵母等
の菌体の培養等を行なつた後、菌体を遠心分離や膜処理
等にて除去した廃液をいう。かかる廃液は、廃糖蜜に由
来するメラノイジン系の色素成分や菌体の生産した有機
酸等を含んでいる。従つて、かかる廃液は酸性であり、
pHが３〜５程度の範囲にあるので、廃液中の大部分の有
機酸は解離していない。According to the present invention, there is provided a membrane treatment method for an organic acid-containing fermentation waste liquid, wherein the pH of the organic acid-containing fermentation waste liquid is adjusted to 6 or more. It is characterized by doing. In the present invention, the organic acid-containing fermentation waste liquid refers to a waste liquid obtained by culturing cells such as yeasts using molasses or the like as a main raw material and removing the cells by centrifugation or membrane treatment. The waste liquid contains a melanoidin-based pigment component derived from molasses, an organic acid produced by cells, and the like. Therefore, such effluent is acidic,
Since the pH is in the range of about 3 to 5, most of the organic acids in the waste liquid are not dissociated.
【０００５】しかし、本発明に従つて、廃液のpHを６以
上、好ましくは７以上、更に好ましくは８以上のアルカ
リ性とすることによつて、廃液中の有機酸を解離させる
ことができ、本発明に従つて、膜によつて有効に阻止さ
れる。このような廃液のpHの調整は、例えば、水酸化ナ
トリウム、水酸化カリウム、水酸化カルシウム等のアル
カリにて行なうことができる。However, according to the present invention, by setting the pH of the waste liquid to be at least 6, preferably at least 7, more preferably at least 8, the organic acid in the waste liquid can be dissociated. According to the invention, it is effectively blocked by the membrane. Such pH adjustment of the waste liquid can be performed with an alkali such as sodium hydroxide, potassium hydroxide, calcium hydroxide, or the like.
【０００６】本発明においては、上記のように解離させ
た有機酸を相互の荷電の反発によつて効率よく膜によつ
て阻止するために、用いる膜は負荷電性の膜であること
が必要である。かかる負荷電性の膜としては、ポリスル
ホン、ポリエーテルスルホン、ポリエーテルケトン、ポ
リアミド、ポリイミド、ポリオレフイン等の有機重合体
や、セラミツク、多孔質ガラス等の無機物質にカルボキ
シル基やスルホン酸基等を導入した膜を好ましい例とし
て挙げることができる。In the present invention, the film used must be a negatively charged film in order to efficiently block the dissociated organic acids by the repulsion of mutual charges by the film. It is. Such negatively-chargeable membranes include organic polymers such as polysulfone, polyethersulfone, polyetherketone, polyamide, polyimide, and polyolefin, and carboxyl groups and sulfonic acid groups introduced into inorganic substances such as ceramics and porous glass. A preferred example can be cited as a preferred example.
【０００７】かかる膜の有する孔径は、それが大きすぎ
るときは、発酵廃液の膜処理において有機酸が膜を透過
して阻止されず、他方、余りに小さいときは、有機酸は
阻止されるものの、透過液量が少なすぎるので、実用的
でない。本発明によれば、膜としては、通常、分画分子
量が３０００以下の限外濾過膜や、或いは食塩の阻止率
が９9.９％以下の逆浸透膜を例示することができる。When the pore size of such a membrane is too large, the organic acid does not pass through the membrane in the membrane treatment of the fermentation waste liquid and is not blocked. On the other hand, when the pore size is too small, the organic acid is blocked. It is not practical because the amount of permeate is too small. According to the present invention, examples of the membrane generally include an ultrafiltration membrane having a cut-off molecular weight of 3000 or less and a reverse osmosis membrane having a salt rejection of 99.9% or less.
【０００８】更に、膜の構造は、非対称膜でも均質膜で
もよく、また、複合膜でもよい。また、かかる膜を備え
たモジユールも何ら限定されるものではなく、例えば、
チユーブラー型、中空糸スパイラル型、プレートアンド
フレーム型、回転平膜、モノリス型等、いずれでもよ
い。The structure of the membrane may be an asymmetric membrane, a homogeneous membrane, or a composite membrane. Also, the module provided with such a membrane is not limited at all, for example,
Any of a tumbler type, a hollow fiber spiral type, a plate and frame type, a rotating flat membrane, a monolith type and the like may be used.
【０００９】[0009]
【発明の効果】以上のように、本発明の方法によれば、
有機酸含有発酵廃液のpHを６以上に調整すると共に、負
荷電性の膜にて処理することによつて、従来、得ること
が困難であつた有機酸濃度が大幅に低減された膜透過液
を得ることができる。As described above, according to the method of the present invention,
By adjusting the pH of the organic acid-containing fermentation waste liquor to 6 or more and treating it with a negatively-charged membrane, the concentration of organic acids, which had been difficult to obtain conventionally, has been greatly reduced. Can be obtained.
【００１０】[0010]
【実施例】以下に実施例を挙げて本発明を説明するが、
本発明はこれら実施例により何ら限定されるものではな
い。 実施例１ pH５のイースト製造廃液を水酸化ナトリウムにてpHを５
〜７に調整し、これをスルホン酸基を有する荷電性複合
膜を備えた膜モジユール（日東電工（株）製ＮＴＲ−７
４１０−Ｓ４）を用いて処理した。処理条件は、圧力１
０Kgf/cm2 、液温２５℃、濃縮液流量２０リツトル／分
とした。平均透過流束は約９リツトル／m2・時であつ
た。EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited by these examples. Example 1 A pH 5 yeast effluent was adjusted to pH 5 with sodium hydroxide.
~ 7, and this was adjusted to a membrane module provided with a chargeable composite membrane having a sulfonic acid group (NTR-7 manufactured by Nitto Denko Corporation).
410-S4). The processing conditions are pressure 1
0 kgf / cm 2 , a liquid temperature of 25 ° C., and a flow rate of the concentrated liquid of 20 liter / min. The average flux was about 9 liters / m 2 · hr.
【００１１】廃液及び膜透過液中の有機酸をキヤピラリ
ーカラムガスクロマトグラフイーにて分析した。結果を
表１に示す。The organic acid in the waste liquid and the membrane permeate was analyzed by capillary column gas chromatography. Table 1 shows the results.
【００１２】[0012]
【表１】 [Table 1]
【００１３】表１に示す結果から明らかなように、エタ
ノールのような中性低分子量有機化合物の膜透過液中の
濃度は、廃液のpHを調整しても実質的に変化ないが、有
機酸は、廃液のpHを６以上とすることによつて有効に低
減させることができ、更に、７以上とすることによつて
半分以下に低減させることができる。 実施例２ 実施例１と同じ廃液のpHを6.４に調整し、膜透過液のpH
をそのままとし、又は１０に調整した以外は、実施例１
と同様にして膜処理した。廃液及び膜透過液中の有機酸
の濃度の分析結果を表２に示す。As is clear from the results shown in Table 1, the concentration of the neutral low molecular weight organic compound such as ethanol in the permeate does not substantially change even if the pH of the waste liquid is adjusted. Can be effectively reduced by setting the pH of the waste liquid to 6 or more, and further reduced to half or less by setting the pH of the waste liquid to 7 or more. Example 2 The same waste liquid pH as in Example 1 was adjusted to 6.4, and the pH of the membrane permeate was adjusted.
Example 1 except that
The film treatment was performed in the same manner as described above. Table 2 shows the analysis results of the concentrations of the organic acids in the waste liquid and the membrane permeate.
【００１４】[0014]
【表２】 [Table 2]
【００１５】本発明に従つて、膜透過液のpHをアルカリ
性とすることよつて、膜透過液中の有機酸濃度を一層低
減させることができる。According to the present invention, by making the pH of the membrane permeate alkaline, the concentration of the organic acid in the membrane permeate can be further reduced.
Claims (2)
て、有機酸含有発酵廃液のpHを６以上に調整し、負荷電
性の膜にて処理することを特徴とする有機酸含有発酵廃
液の膜処理方法。1. A method for membrane-treating an organic acid-containing fermentation waste liquor, wherein the pH of the organic acid-containing fermentation effluent is adjusted to 6 or more and treated with a negatively charged membrane. Membrane treatment method.
とする請求項１記載の有機酸含有発酵廃液の膜処理方
法。2. The method according to claim 1, wherein the pH of the membrane permeate is adjusted to 8 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3249691A JP3050430B2 (en) | 1991-09-27 | 1991-09-27 | Membrane treatment method for organic acid-containing fermentation waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3249691A JP3050430B2 (en) | 1991-09-27 | 1991-09-27 | Membrane treatment method for organic acid-containing fermentation waste liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0584490A JPH0584490A (en) | 1993-04-06 |
| JP3050430B2 true JP3050430B2 (en) | 2000-06-12 |
Family
ID=17196772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3249691A Expired - Lifetime JP3050430B2 (en) | 1991-09-27 | 1991-09-27 | Membrane treatment method for organic acid-containing fermentation waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3050430B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2734386B2 (en) * | 1994-12-20 | 1998-03-30 | 日本電気株式会社 | String reader |
| JP4048279B2 (en) * | 2004-02-24 | 2008-02-20 | 独立行政法人産業技術総合研究所 | Fermentation ethanol separation and purification system |
| KR100861418B1 (en) * | 2008-01-14 | 2008-10-08 | 주식회사 부강테크 | Method for recovering carbon source using byproducts and carbon source using the same method |
| EP2401066B1 (en) * | 2009-02-25 | 2017-10-25 | Council of Scientific & Industrial Research | A polybenzimidazole based premembrane for deacidification; a process for the preparation of the membrane from the premembrane and a process of deacidification |
-
1991
- 1991-09-27 JP JP3249691A patent/JP3050430B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0584490A (en) | 1993-04-06 |
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