JP2015065834A - Method for producing ethanol from paper waste products - Google Patents
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 239000010893 paper waste Substances 0.000 title abstract description 3
- 239000010802 sludge Substances 0.000 claims abstract description 43
- 238000000855 fermentation Methods 0.000 claims abstract description 42
- 230000004151 fermentation Effects 0.000 claims abstract description 42
- 108010059892 Cellulase Proteins 0.000 claims abstract description 27
- 229940106157 cellulase Drugs 0.000 claims abstract description 27
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- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 229940041514 candida albicans extract Drugs 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 3
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- 241000222120 Candida <Saccharomycetales> Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 241001635236 Hemaris Species 0.000 description 2
- 241000907547 Mucor fragilis Species 0.000 description 2
- 108010059820 Polygalacturonase Proteins 0.000 description 2
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- 235000007201 Saccharum officinarum Nutrition 0.000 description 2
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- 150000002402 hexoses Chemical class 0.000 description 2
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- 239000002440 industrial waste Substances 0.000 description 2
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 2
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 2
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- 238000006386 neutralization reaction Methods 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
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- 239000005995 Aluminium silicate Substances 0.000 description 1
- 241000233788 Arecaceae Species 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
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- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 1
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- JVTNITZKZIQWTG-UHFFFAOYSA-N diazanium sulfate heptahydrate Chemical compound [NH4+].[NH4+].O.O.O.O.O.O.O.[O-]S([O-])(=O)=O JVTNITZKZIQWTG-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
Description
本発明は、製紙製造工程で発生する製紙廃棄物からエタノールを製造する方法に関するものである。 The present invention relates to a method for producing ethanol from papermaking waste generated in a papermaking process.
現在、ブラジルやアメリカなどで行われているエタノールの製造は、トウモロコシやサトウキビから得られた６炭糖を主成分とする糖液を、酵母（Ｓ．ｃｅｒｅｖｉｓｉａｅ）を用いる発酵法により行われる。トウモロコシやサトウキビは生産が容易で加工がしやすく豊富な糖が得られ、酵母は高濃度の糖存在下で優れた成長能力を持ち、エタノール生産収率も高い。しかし食料を燃料に替えるという倫理観の問題に始まり、食料としての供給の減少などの重大な問題を抱えている。このような背景から、未利用なバイオマス資源である農産廃棄物（稲わら、もみ殻など）、林産廃棄物（間伐材、廃木材）や産業廃棄物（ＰＳなど）からエタノールを高収率で得る研究が進められている。
未利用なバイオマス資源である農産廃棄物からのエタノール生産は、成分であるセルロースやヘミセルロースなどを分解・発酵させてエタノールを生産する微生物が利用される。
Currently, ethanol production performed in Brazil, the United States, and the like is performed by fermentation using yeast (S. cerevisiae) with a sugar solution mainly composed of hexose obtained from corn and sugarcane. Corn and sugarcane are easy to produce, easy to process, and abundant sugars are obtained. Yeast has excellent growth ability in the presence of high concentrations of sugar and has a high ethanol production yield. However, it begins with the ethical problem of replacing food with fuel, and has serious problems such as a decline in the supply of food. Against this background, ethanol is produced in high yields from unused biomass resources such as agricultural waste (rice straw, rice husk, etc.), forest waste (thinned wood, waste wood) and industrial waste (PS, etc.). Research to gain is underway.
Ethanol production from agricultural waste, which is an unused biomass resource, uses microorganisms that produce ethanol by decomposing and fermenting components such as cellulose and hemicellulose.
しかし、これらＳ．ｃｅｒｅｖｉｓｉａｅを代表するエタノール発酵微生物を用いて５炭糖の代表であるキシロースからエタノール発酵は不可能であり、キシロース発酵酵母であるＣａｎｄｉｄａ ｓｈｅａｔａｅやＰｉｃｈｉａ ｓｔｉｐｉｔｉｓにおいても培養が難しい、副生成物が生成する、エタノール耐性が低い、発酵阻害物質により強く発酵が阻害されるなど多くの問題を抱えている。さらに、組換え微生物（例えば、特許文献１、２）を用いた場合には、高いエタノール生産性を達成できるものの、組換え菌を使用する際の安全性の問題や倫理的問題を解決していく必要がある。 However, these S.P. Ethanol fermentation is impossible from xylose, which is a representative of pentoses, using ethanol-fermenting microorganisms that represent cerevisiae, and by-products are produced that are difficult to cultivate in xandose-fermenting yeasts such as Candida sheatae and Pichia stipitis. It has many problems such as low ethanol resistance and strong inhibition of fermentation by fermentation inhibitors. Furthermore, when recombinant microorganisms (for example, Patent Documents 1 and 2) are used, although high ethanol productivity can be achieved, the problems of safety and ethical problems when using recombinant bacteria are solved. We have to go.
これらのことから、本発明者らエタノール微生物として考えられていなかった糸状菌、特にケカビの検索を行い、全く新しいキシロース発酵糸状菌を発見すると共に、この微生物を用いて我が国の主要な未利用バイオマスとして稲わらからのバイオエタノール製造システムの開発を行ってきた(特許文献３)。 From these facts, the present inventors searched for filamentous fungi, which were not considered as ethanol microorganisms, especially fungi, and found completely new xylose-fermenting filamentous fungi. As a bioethanol production system from rice straw (Patent Document 3).
製紙製造事業所から排出されるペーパースラッジやスクリーンテールなど製紙廃棄物は、高水分含量で有り、バイオマス成分である糖質(セルロースとヘミセルロース)を含み、さらに、 リグニンおよび無機分を多量に含んでいる。この成分中の糖質を有効利用し生物変換によりエタノールを製造するためには、セルロースおよびヘミセルロース成分を加水分解する酵素群の分泌と、加水分解液中の５炭糖および６炭糖ともに効率よくエタノールへ変換することが望まれる。しかし、一般の発酵瀬微生物
Ｓ．ｃｅｒｅｖｉｓｉａｅは、セルロース分解酵素（セルラーゼ）を分泌せず、さらに、５炭糖を資化できるものの発酵性を有しない。また、キシロース発酵酵母であるＣａｎｄｉｄａ ｓｈｅａｔａｅやＰｉｃｈｉａ ｓｔｉｐｉｔｉｓは、５炭糖は発酵するもののセルラーゼ等は分泌しない。さらに、セルラーゼを多量に分泌する糸状菌Ｔｒｉｃｈｏｄｅｒｍａ ｒｅｓｓｅｉやＡｃｒｅｍｏｎｉｕｍ ｃｅｌｌｕｌｏｌｙｔｉｃｕｓはエタノール発酵能を有していない。
Paper waste such as paper sludge and screen tails discharged from paper manufacturing establishments has a high moisture content, includes carbohydrates (cellulose and hemicellulose) as biomass components, and also contains a large amount of lignin and inorganic components. Yes. In order to produce ethanol by bioconversion using the carbohydrates in this component effectively, both the secretion of enzymes that hydrolyze the cellulose and hemicellulose components and the pentose and hexose in the hydrolyzed solution are both efficient. It is desirable to convert to ethanol. However, general fermented microorganism S. cerevisiae does not secrete cellulolytic enzyme (cellulase), and can assimilate pentose, but has no fermentability. In addition, Candida sheatae and Pichia stititis, which are xylose-fermenting yeasts, ferment pentose but do not secrete cellulase or the like. Furthermore, the filamentous fungi Trichoderma ressei and Acremonium cellulolyticus that secrete a large amount of cellulase do not have ethanol fermentation ability.
そこで、近年、セルラーゼおよびキシロース代謝酵素遺伝子を組換えたＳ．ｃｅｒｅｖｉｓｉａｅやＺ．ｐａｌｍａｅ、地球環境産業技術研究機構（ＲＩＴＥ）による組換えコリネ菌などが開発されてきているが、遺伝子組換え菌であることからカルタヘナル法の適用を受けて規制が厳しく、さらに、実際の製造において拡散防止などの設備を必要とする製造施設に多大なコストが負担となり商業化されていない。 Therefore, in recent years, S. cerevisiae having cellulase and xylose metabolizing enzyme genes recombined has been developed. cerevisiae and Z. Recombinant corynebacteria have been developed by Palmae, Institute for Global Environmental Industrial Technology (RITE), but since it is a genetically engineered bacterium, regulations are severe under the application of the Cartagenal Act, and actual production In manufacturing facilities that require equipment such as diffusion prevention, large costs are incurred and are not commercialized.
一方、同時糖化発酵（ＳＳＦ）システムおよび糖化発酵同時進行（ＣＢＰ）システムは、現在、我が国で進められているエタノール製造において、次世代型のエタノール製造技術であり、２０２０年を目標に実用化が進められている。
一般の発酵微生物と市販の酵素剤を混合し、一つの発酵槽内で糖化と発酵を同時に行う同時糖化発酵システムは、市販の酵素剤を利用するため、酵素製造に関する経費が増大し、エタノール製造コストが向上することが問題である。
On the other hand, the simultaneous saccharification and fermentation (SSF) system and the simultaneous saccharification and fermentation (CBP) system are next-generation ethanol production technologies currently being promoted in Japan and will be put into practical use with the goal of 2020. It is being advanced.
A simultaneous saccharification and fermentation system that mixes general fermenting microorganisms with commercially available enzyme agents and simultaneously performs saccharification and fermentation in one fermentor uses commercially available enzyme agents, which increases the costs associated with enzyme production and produces ethanol. The problem is that the cost increases.
木質系バイオマス由来のセロルース繊維を含む製紙廃棄物からのエタノール生産を実用化させるためには、セルラーゼを分泌生産し、さらに、キシロースも発酵できる野性の菌株を見出すことも必要である。そこで、発明者らは、当研究室に保存している接合菌ライブラリーからセルラーゼを分泌生産すると共に、キシロースも発酵できる菌株の検索を行い、有用な接合菌株を見出した。さらに、該接合菌のみを用いた糖化発酵同時進行システムを構築した。また、該接合菌と市販のセルラーゼ剤を組み合わせた同時糖化発酵システムを構築した。さらに、前記システムでペーパースラッジからエタノール製造を行う際に問題となる夾雑物の処理法を見出し、本発明を完成させるに至った。
以下、本発明を詳細に説明する。
In order to put ethanol production from papermaking waste containing cellulosic fiber derived from woody biomass into practical use, it is also necessary to find a wild strain capable of secreting and producing cellulase and fermenting xylose. Therefore, the inventors searched for a strain capable of secreting and producing cellulase from a zygote library stored in this laboratory and also fermenting xylose, and found a useful zygote. Furthermore, a saccharification and fermentation simultaneous progress system using only the zygomycete was constructed. Moreover, the simultaneous saccharification and fermentation system which combined this zygote and the commercially available cellulase agent was constructed | assembled. Furthermore, the present invention has been completed by finding a method for treating foreign matters that cause problems when ethanol is produced from paper sludge using the above system.
Hereinafter, the present invention will be described in detail.
本発明において使用される接合菌株は、ペーパースラッジからエタノールの生産する能力を有する接合菌門・接合菌綱・ケカビ目に属するカビであり、ムコール（Ｍｕｃｏｒ）、リゾムコール（Ｒｈｉｚｏｍｕｃｏｒ）などに属するカビが挙げられる。具体的には、例えば以下のような種を示すことができる。 The mating strains used in the present invention are molds belonging to the order of the zygomycota, zygomycetes, and fungi that have the ability to produce ethanol from paper sludge. Molds belonging to Mucor, Rhizomucor, etc. Can be mentioned. Specifically, for example, the following species can be shown.
ムコール・アンビグス（Ｍｕｃｏｒ ａｍｂｉｇｕｕｓ）
ムコール・シイルシネロイデェス（Ｍｕｃｏｒ ｃｉｒｃｉｎｅｌｌｏｉｄｅｓ）
ムコール・フラギリス（Ｍｕｃｏｒ ｆｒａｇｉｌｉｓ）
ムコール・ヘマリス（Ｍｕｃｏｒ ｈｉｅｍａｌｉｓ）
ムコール・イナエクイスポラス（Ｍｕｃｏｒ ｉｎａｅｑｕｉｓｐｏｒｕｓ）
ムコール・オブロンジエリプティカス（Ｍｕｃｏｒ ｏｂｌｏｎｇｉｅｌｌｉｐｔｉｃｕｓ）
ムコール・ラセモサス（Ｍｕｃｏｒ ｒａｃｅｍｏｓｕｓ）
ムコール・レクルバス（Ｍｕｃｏｒ ｒｅｃｕｒｖｕｓ）
ムコール・サトゥルニナス（Ｍｏｃｏｒ ｓａｔｕｒｎｉｎｕｓ）
ムコール・サブティリススミウス（Ｍｏｃｏｒ ｓｕｂｔｉｌｉｓｓｍｕｓ）
リゾムコール・プシルス（Ｒｈｉｚｏｍｕｃｏｒ ｐｕｓｉｌｌｕｓ）
Mucor ambiguus
Mucor circinoroides
Mucor fragilis
Mucor hemaris
Mucor inaequisporus
Mucor oblongiellipticus (Mucor oblongielliticus)
Mucor racemosus
Mucor recrubus
Mucor Saturninus
Mucor subtilissum
Rhizomucor pusillus
上記のケカビ目のカビは、湿気の多い有機物上に出現する、ごく普通のカビである。これら微生物の、土壌、河川、あるいは湖沼などの材料からの単離・同定法は公知である。たとえば単離および同定方法については以下のような文献を参照することができる。
カビ：”The Genera of Hyphomycetes from soil”， G.L.Barron, Baltimore, Maryland, Williams and Wilkins(1968)．
”Compendium of soil Fungi”， K.H.
Domsh, W. Gams, T. Anderson, New York, Academic Press(1980)．
The above moldy mold is an ordinary mold that appears on wet organic matter. Methods for isolating and identifying these microorganisms from materials such as soil, rivers, and lakes are well known. For example, the following documents can be referred to for isolation and identification methods.
Mold: “The Genera of Hyphomycetes from soil”, GL Barron, Baltimore, Maryland, Williams and Wilkins (1968).
“Compendium of soil Fungi”, KH
Domsh, W. Gams, T. Anderson, New York, Academic Press (1980).
より具体的には、以下の微生物菌株を示すことができる。
ムコール・アンビグス（ＮＢＲＣ６７４２）
ムコール・シイルシネロイデェス（ＮＢＲＣ４５７２，４５５４，４５６９，４５７４，５３８２，５７７４，３０４７０，４５６３，６７４６）
ムコール・フラギリス（ＮＢＲＣ９４０２）
ムコール・ヘマリス（ＮＢＲＣ９４００，９４０７，６７５４）
ムコール・イナエクイスポラス（ＮＢＲＣ８６３５）
ムコール・オブロンジエリプティカス（ＮＢＲＣ９２５８）
ムコール・ラセモサス（ＮＢＲＣ６７４５）
ムコール・レクルバス（ＮＢＲＣ８０９３）
ムコール・サトゥルニナス（ＮＢＲＣ９５６２）
ムコール・サブティリススミウス（ＮＢＲＣ６７５５）
リゾムコール・プシルス（ＮＢＲＣ４５７８）
これらのカビは、野生株または変異株のいずれの株も用いることができる。また、これらのカビは、単独または混合して使用することができる。
More specifically, the following microbial strains can be shown.
Mucor Ambigs (NBRC6742)
Mucor Sierine Roydes (NBRC4572, 4554, 4569, 4574, 5382, 5774, 30470, 4563, 6746)
Mucor Fragilis (NBRC9402)
Mucor Hemaris (NBRC 9400, 9407, 6754)
Mucor Inaquisporus (NBRC8635)
Mucor Oblongi Ellipticus (NBRC9258)
Mucor Racemosas (NBRC 6745)
Mucor Recrubus (NBRC8093)
Mucor Saturninas (NBRC 9562)
Mucor Subtilis Sumius (NBRC 6755)
Rhizomukor Psils (NBRC4578)
These molds can be used either wild-type or mutant. These molds can be used alone or in combination.
上記の菌株は、独立行政法人製品評価技術基盤機構 バイオテクノロジー本部 生物遺伝資源部門（ＮＢＲＣ）
発行の微生物カタログ第１版（２００５年）に記載されており、それぞれのアクセション番号をもとにＮＢＲＣなどのセルバンクから入手することができる。
The above strains are from the National Institute of Product Evaluation Technology Biotechnology Headquarters Biogenetic Resources Division (NBRC)
It is described in the published microorganism catalog 1st edition (2005) and can be obtained from cell banks such as NBRC based on the respective accession numbers.
上記したケカビ目の接合菌株は、エンド−β−グルカナーゼを分泌し、エタノールの発酵生産のみならず、セルラーゼも分泌生産することができる。 The above-mentioned conjugated fungus is capable of secreting endo-β-glucanase and producing not only ethanol fermentation but also cellulase.
上記したセルラーゼの分泌生産能を利用してエタノールの製造を行う場合、ペーパースラッジやペーパースラッジテールなど製紙廃棄物からのエタノール製造を糖化発酵同時進行で行うシステムを構築することができる。 When ethanol is produced using the secretory production ability of cellulase described above, it is possible to construct a system for producing ethanol from papermaking waste such as paper sludge and paper sludge tail simultaneously with saccharification and fermentation.
接合菌門・接合菌綱・ケカビ目に属するカビとセルラーゼ剤を用いて、同時糖化発酵により製紙廃棄物からエタノールを製造することができる。
ここで用いられるセルラーゼ剤は特に限定されず、市販のセルラーゼ剤を用いればよい。セルラーゼ剤は複数組み合わせでカクテルとすることができ、例えば、アクセラーゼ・メイセラーゼ・ペクチナーゼのセルラーゼカクテルなどが挙げられる。
Ethanol can be produced from papermaking waste by simultaneous saccharification and fermentation using fungi belonging to the zygomycetes, zygomycetes, fungi and cellulase agents.
The cellulase agent used here is not particularly limited, and a commercially available cellulase agent may be used. The cellulase agent can be used as a cocktail by combining a plurality of cellulase agents, and examples thereof include cellulase cocktails of accelerators, mecerases, and pectinases.
ペーパースラッジからのエタノール製造を同時糖化発酵システムまたは糖化発酵同時進行システムで行う場合、前処理として、ペーパースラッジ中の凝集剤、填料、炭酸カルシウムなどの夾雑物を減らしておくことが好ましい。前処理として水洗処理、塩酸処理およびそれらの組み合わせ処理が挙げられる。塩酸処理には処理後の中和処理も含まれる。 When ethanol production from paper sludge is performed by a simultaneous saccharification and fermentation system or a simultaneous saccharification and fermentation system, it is preferable to reduce impurities such as flocculant, filler, and calcium carbonate in the paper sludge as a pretreatment. Examples of the pretreatment include water washing treatment, hydrochloric acid treatment and a combination treatment thereof. The hydrochloric acid treatment includes a neutralization treatment after the treatment.
本発明のセルラーゼの分泌能を有するエタノール発酵微生物を使用することから、同時糖化発酵においては、使用酵素の添加量の軽減に繋がり、製造コストの削減が可能である。
また、糖化発酵同時進行の場合、本発明のセルラーゼの分泌能を有するエタノール発酵微生物のみを発酵槽へ投入し、ペーパースラッジへの糖化と発酵を行うことから、酵素製造に係わるコストは必要としない。
すなわち、本発明により、ペーパースラッジのような産業廃棄物を含む未利用セルロース系バイオマスからバイオ燃料として利用されているエタノールを安価に製造することが可能となる。
Since the ethanol-fermenting microorganism having the secretory ability of the cellulase of the present invention is used, in the simultaneous saccharification and fermentation, the amount of the enzyme used is reduced, and the production cost can be reduced.
In the case of simultaneous progress of saccharification and fermentation, only the ethanol-fermenting microorganism having the ability to secrete the cellulase of the present invention is introduced into the fermentor, and saccharification and fermentation into paper sludge are performed, so that no cost for enzyme production is required. .
That is, according to the present invention, ethanol used as biofuel can be produced at low cost from unused cellulosic biomass containing industrial waste such as paper sludge.
本発明について、以下の実施例に基づきさらに詳細に説明するが、本発明は以下の実施例に制限されるものではない。 The present invention will be described in more detail based on the following examples, but the present invention is not limited to the following examples.
［実施例１］
硫酸アンモニウム（０．７５％）、リン酸水素二カリウム（０．３５％）、塩化カルシウム（０．１％）、硫酸マグネシウム・７水和物（０．０７５％）、酵母エキス（０．５％）、ｐＨ７．５の液体培地に、グルコース（２％）を含む寒天プレートで、ケカビ目の接合菌株を２８℃で３〜５日培養した後、寒天プレートを粉砕し生理食塩液に懸濁させた。
生ペーパースラッジ（５％）を含有する上記の２５ｍＬに、上記懸濁液１ｍＬを加え、２８℃、１２０時間嫌気下で振とう培養した。
[Example 1]
Ammonium sulfate (0.75%), dipotassium hydrogen phosphate (0.35%), calcium chloride (0.1%), magnesium sulfate heptahydrate (0.075%), yeast extract (0.5% ) After culturing the conjugated fungus mold at 28 ° C. for 3 to 5 days on an agar plate containing glucose (2%) in a pH 7.5 liquid medium, the agar plate is crushed and suspended in physiological saline. It was.
1 mL of the above suspension was added to the above 25 mL containing raw paper sludge (5%), and cultured with shaking at 28 ° C. for 120 hours under anaerobic conditions.
培養終了後、定性濾紙(Ａｄｖａｎｔｅｃ製、Ｎｏ．１３１)を用いて濾過を行うことにより菌体を除去し、各培養液の培養上清液を調製した。濾紙上に得られた菌体は、蒸留水で十分洗浄した後、９０℃で２４時間乾燥させた後、重量を測定し、乾燥菌体重量を求めた。一方、ガスクロマトグラフィーにより、培養により得られた培養液中のエタノールを定量した。
ペーパースラッジ発酵能を有するケカビによるエタノール生産を表１に示す。また、ペーパースラッジ発酵能を有するケカビによるペーパースラッジからのエタノール生産とセルラーゼ（エンド−β−グルカナーゼ）生産を表２に示す。
After completion of the culture, the cells were removed by filtration using qualitative filter paper (manufactured by Advantec, No. 131), and a culture supernatant of each culture was prepared. The bacterial cells obtained on the filter paper were sufficiently washed with distilled water and then dried at 90 ° C. for 24 hours, and then the weight was measured to obtain the dry bacterial cell weight. On the other hand, ethanol in the culture solution obtained by culture was quantified by gas chromatography.
Table 1 shows ethanol production by fungi having paper sludge fermentation ability. Table 2 shows ethanol production and cellulase (endo-β-glucanase) production from paper sludge by fungi having paper sludge fermentation ability.
［実施例２］
＜同時糖化発酵によるペーパースラッジからのエタノール製造＞
硫酸アンモニウム（０．７５％）、リン酸水素二カリウム（０．３５％）、硫酸マグネシウム・７水和物（０．０７５％）、酵母エキス（０．５％）、ｐＨ５．５の液体培地に、セルラーゼカクテル（１Ｌ中のタンパクとして、アクセラーゼ１．３９３ｇ、メイセラーゼ０．９４３、ペクチナーゼ０．６４６４ｇを含有）３ｇ（タンパク／Ｌ）およびペーパースラッジ１００ｇ／Ｌの培地で、ムコール・シイルシネロイデェス（ＮＢＲＣ４５６３）を２８℃で振とう培養した。その結果を図１に示す。
[Example 2]
<Ethanol production from paper sludge by simultaneous saccharification and fermentation>
In a liquid medium of ammonium sulfate (0.75%), dipotassium hydrogen phosphate (0.35%), magnesium sulfate heptahydrate (0.075%), yeast extract (0.5%), pH 5.5 , Cellulase cocktail (contains 1.393 g of accelerator, 0.943 g of mecerase, 0.6464 g of pectinase as protein in 1 L) and 3 g (protein / L) of paper sludge and 100 g / L of paper sludge. NBRC4563) was cultured with shaking at 28 ° C. The result is shown in FIG.
ムコール・シイルシネロイデェス（ＮＢＲＣ４５６３）とペーパースラッジの加水分解に対して最適化したセルラーゼカクテル剤を用いて生ペーパースラッジを原料として同時糖化発酵システムを実施した結果、培養７２時間目に得られたエタノール濃度は８．９ｇ／Ｌ、発酵効率６１％、このときの最大エタノール生産性は０．１２３ｇ／Ｌ／ｈであった。 As a result of the simultaneous saccharification and fermentation system using raw paper sludge as raw material using Mucor Silycineerodes (NBRC4563) and cellulase cocktail optimized for paper sludge hydrolysis, it was obtained at 72 hours in culture. The ethanol concentration was 8.9 g / L, the fermentation efficiency was 61%, and the maximum ethanol productivity at this time was 0.123 g / L / h.
［実施例３］
＜ペーパースラッジの前処理＞
（１）生ペーパースラッジ中のセルロースに付着している無機・有機成分を水洗した。
具体的には、生ペーパースラッジ １ｋｇを２０Ｌの洗浄容器に入れ、そこへ１０Ｌの蒸留水を加え、常温で４８時間ゆっくり撹拌した。このペーパースラッジ懸濁液を、ガーゼを３枚重ねたザルでこし取り、再度、５Ｌの蒸留水で２４時間以上洗浄した。再度、水で洗浄したペーパースラッジを、ガーゼを重ねたザルでこし取り、得られた固形物を試料とした。
ペーパースラッジ中の各成分の水洗前後の変化を表３に示した。
[Example 3]
<Pretreatment of paper sludge>
(1) The inorganic and organic components adhering to the cellulose in the raw paper sludge were washed with water.
Specifically, 1 kg of raw paper sludge was put into a 20 L washing container, 10 L of distilled water was added thereto, and the mixture was slowly stirred at room temperature for 48 hours. This paper sludge suspension was scraped with a colander with three sheets of gauze and washed again with 5 L of distilled water for 24 hours or more. Again, the paper sludge washed with water was scraped with a colander piled with gauze, and the resulting solid was used as a sample.
Table 3 shows the change of each component in the paper sludge before and after washing.
生ペーパースラッジを水洗することにより無機・有機成分が約９％減少する一方、発酵糖が約９％増加した。 By washing raw paper sludge with water, inorganic and organic components decreased by about 9%, while fermented sugar increased by about 9%.
（２）生ペーパースラッジを１Ｎ塩酸水溶液に浸した後、中和・水洗した。
具体的には、生ペーパースラッジ１ｋｇを２０Ｌの洗浄容器に入れ、そこへ５Ｌの１Ｎ塩酸を加え、常温で４８時間ゆっくり撹拌した。このペーパースラッジ懸濁液を、ガーゼを３枚重ねたザルでこし取り、得られた固形物を再び１０Ｌの容器に入れ、そこへ２Lの蒸留水を加え２４時間ゆっくり撹拌しながら１Ｎの水酸化ナトリウム水溶液を加え中和した。中和したペーパースラッジ懸濁液を再びガーゼを重ねたザルでこし取り、再度、５Ｌの蒸留水で２４時間以上洗浄した。再度、ガーゼを重ねたザルでこし取り、得られた固形物を試料とした。
ペーパースラッジ中の各成分の塩酸処理前後の変化を表４に示した。
(2) The raw paper sludge was immersed in a 1N hydrochloric acid aqueous solution and then neutralized and washed with water.
Specifically, 1 kg of raw paper sludge was put in a 20 L washing container, 5 L of 1N hydrochloric acid was added thereto, and the mixture was slowly stirred at room temperature for 48 hours. The paper sludge suspension is scraped with a colander with three sheets of gauze, and the obtained solid is put again into a 10 L container, 2 L of distilled water is added thereto, and 1N hydroxide is added while slowly stirring for 24 hours. A sodium aqueous solution was added for neutralization. The neutralized paper sludge suspension was rubbed again with a gauze-coated colander and washed again with 5 L of distilled water for 24 hours or more. Again, it was scraped with a colander piled with gauze, and the resulting solid was used as a sample.
Table 4 shows the changes of each component in the paper sludge before and after hydrochloric acid treatment.
生ペーパースラッジを塩酸に浸漬後、水洗することにより無機成分が約３０％減少する一方、発酵糖が約２１％増加した。 When the raw paper sludge was immersed in hydrochloric acid and washed with water, the inorganic components decreased by about 30%, while the fermented sugar increased by about 21%.
（３）塩酸処理したペーパースラッジを用いて糖化発酵同時進行を行った結果を図２に示す。
培養２４時間目までエタノール生産量は急激に増加し、培養７２時間目に１８ｇ／Ｌのエタノールを得ることに成功した。このときの最大収率は、約７０％、最大エタノール生産性は０．４８ｇ／Ｌ／ｈに達した。この結果から、生のペーパースラッジ中には製紙製造工程で使用される填料（炭酸カルシウム、カオリン）、界面活性剤、インクなど多くの不純物が含まれ、特に、カルシウム塩が生物変換反応の妨げになっていることが明かとなった。
(3) The results of simultaneous saccharification and fermentation using paper sludge treated with hydrochloric acid are shown in FIG.
The ethanol production increased rapidly until 24 hours of culture, and 18 g / L of ethanol was successfully obtained at 72 hours of culture. The maximum yield at this time was about 70%, and the maximum ethanol productivity reached 0.48 g / L / h. From this result, raw paper sludge contains many impurities such as fillers (calcium carbonate, kaolin), surfactants, and inks used in the paper manufacturing process. In particular, calcium salts interfere with biotransformation reactions. It became clear that
［実施例４］
＜同時糖化発酵によるペーパースラッジテールからのエタノール製造＞
硫酸アンモニウム（０．７５％）、硫酸アンモニウム・７水和物 ０．０７５％）、リン酸水素二カリウム（０．３５％）、塩化カルシウム・２水和物（０．１％）、硫酸マグネシウム・7水和物（０．０７５％）、酵母エキス（０．５％）、ｐＨ５．５の液体培地に、ペーパースラッジテール８０ｇ／Ｌの培地で、ムコール・シイルシネロイデェス（ＮＢＲＣ４５６３）を２８℃で振とう培養した。その結果を図２に示す。
[Example 4]
<Ethanol production from paper sludge tail by simultaneous saccharification and fermentation>
Ammonium sulfate (0.75%), Ammonium sulfate heptahydrate 0.075%), Dipotassium hydrogen phosphate (0.35%), Calcium chloride dihydrate (0.1%), Magnesium sulfate Hydrate (0.075%), yeast extract (0.5%), pH 5.5 in a liquid medium, paper sludge tail 80 g / L medium, mucor syle cineroides (NBRC4563) at 28 ° C. Cultured with shaking. The result is shown in FIG.
ムコール・シイルシネロイデェス（ＮＢＲＣ４５６３）のみを用いた糖化発酵同時進行により、８０ｇ／Ｌの抄紙工程から排出されるペーパーテールの直接エタノール生産を実施した結果、最終的に得られたエタノールは２７．５ｇ／Ｌであり、発酵収率は８５％に達した。 As a result of the direct ethanol production of the paper tail discharged from the papermaking process of 80 g / L by simultaneous progress of saccharification and fermentation using only Mucor cyllineroides (NBRC4563), the final ethanol obtained was 27. The fermentation yield reached 85%.
本発明により、製紙業界から排出される製紙廃棄物の問題点である化石燃料の多量消費、それに伴う炭酸ガスの発生を軽減でき、さらに、備蓄性の燃料であるエタノールを安価かつ効率よく製造することが可能となる。この分野において、エタノール製造の実用化は、エタノールの発酵効率の向上とコスト削減に係っている。本発明に使用されるカビは、セルラーゼの分必能を有していることから、バイオマスであるペーパースラッジの発酵処理に必要な酵素添加量の軽減あるいは酵素無添加状態でエタノールを生産でき、大幅なコスト削減が可能である。 According to the present invention, a large amount of fossil fuel, which is a problem of papermaking waste discharged from the paper industry, can be reduced, and the generation of carbon dioxide gas accompanying it can be reduced. It becomes possible. In this field, the practical use of ethanol production is related to the improvement of ethanol fermentation efficiency and cost reduction. Since the mold used in the present invention has the necessary ability of cellulase, ethanol can be produced in a state where the amount of enzyme addition required for the fermentation treatment of paper sludge as biomass is reduced or no enzyme is added. Cost reduction is possible.
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