JP2017019702A - Method for producing liquid fertilizer - Google Patents

Method for producing liquid fertilizer Download PDF

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JP2017019702A
JP2017019702A JP2015140609A JP2015140609A JP2017019702A JP 2017019702 A JP2017019702 A JP 2017019702A JP 2015140609 A JP2015140609 A JP 2015140609A JP 2015140609 A JP2015140609 A JP 2015140609A JP 2017019702 A JP2017019702 A JP 2017019702A
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methane fermentation
liquid fertilizer
liquid
ash
fermentation residue
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幸子 中嶋
Sachiko Nakajima
幸子 中嶋
政宏 斉藤
Masahiro Saito
政宏 斉藤
智裕 庄
Tomohiro SHO
智裕 庄
智 小倉
Satoshi Ogura
智 小倉
昭博 中嶋
Akihiro Nakajima
昭博 中嶋
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Mitsui Engineering and Shipbuilding Co Ltd
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    • 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
    • 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
    • Y02W10/20—Sludge processing
    • 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
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/20—Waste processing or separation
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)
  • Fertilizers (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing liquid fertilizer capable of producing liquid fertilizer having an improved balance of N, P and K.SOLUTION: The method for producing liquid fertilizer according to the present invention is characterized in that when liquid fertilizer is produced from a digested liquid obtained by methane fermentation of a fermentation material, the digested liquid is subjected to solid-liquid separation, the methane fermentation residue is separated, the methane fermentation residue is burned and the ash obtained thereby is added to the digestive liquid after the methane fermentation residue has been separated, and mixed. Preferably, by the addition of ash, the liquid fertilizer is supplemented with phosphorus.SELECTED DRAWING: Figure 1

Description

本発明は、Ｎ、Ｐ、Ｋのバランスが改善された液肥の製造方法に関する。   The present invention relates to a method for producing liquid fertilizer in which the balance of N, P, and K is improved.

特許文献１には、メタン発酵後の消化液を液肥として利用する技術が開示されている。   Patent Document 1 discloses a technique of using digested liquid after methane fermentation as liquid fertilizer.

特開２００８−２５３８７５号公報JP 2008-253875 A

飼料作物用の一般的な肥料として、例えば窒素（Ｎ）、リン（Ｐ）及びカリウム（Ｋ）の濃度がすべて８％であり、含有比率が１：１：１であるもの等が用いられている。   As a general fertilizer for forage crops, for example, nitrogen (N), phosphorus (P) and potassium (K) are all 8% in concentration and the content ratio is 1: 1: 1. Yes.

しかるに、特に糞尿や敷料を含む有機性廃棄物をメタン発酵した場合、得られる消化液のＮ、Ｐ、Ｋのバランスを見ると、Ｐが不足する傾向があることがわかった。   However, in particular, when organic waste containing manure and bedding was subjected to methane fermentation, it was found that there was a tendency for P to be insufficient when the balance of N, P, and K in the resulting digestive juice was observed.

市販のＰ成分を添加する手法では、コスト高となる問題がある。   The method of adding a commercially available P component has a problem of high cost.

そこで、本発明の課題は、Ｎ、Ｐ、Ｋのバランスが改善された液肥を製造することができる液肥の製造方法を提供することにある。   Then, the subject of this invention is providing the manufacturing method of the liquid fertilizer which can manufacture the liquid fertilizer in which the balance of N, P, and K was improved.

また本発明の他の課題は、以下の記載によって明らかとなる。   Other problems of the present invention will become apparent from the following description.

上記課題は、以下の各発明によって解決される。   The above problems are solved by the following inventions.

（請求項１）
発酵原料をメタン発酵させて得られた消化液から液肥を製造する際に、
前記消化液を固液分離してメタン発酵残渣を分離し、
前記メタン発酵残渣を燃焼させて得られた灰を、前記メタン発酵残渣が分離された後の前記消化液に添加し、混合することを特徴とする液肥の製造方法。 (Claim 1)
When producing liquid fertilizer from digestive juice obtained by methane fermentation of fermentation raw materials,
Solid digestion of the digestive juice to separate methane fermentation residue,
A method for producing liquid fertilizer, comprising adding the ash obtained by burning the methane fermentation residue to the digested liquid after the methane fermentation residue is separated and mixing the ash.

（請求項２）
前記灰の添加により、前記液肥のリンを補填することを特徴とする請求項１記載の液肥の製造方法。 (Claim 2)
The method for producing liquid fertilizer according to claim 1, wherein phosphorus is added to the liquid fertilizer by adding the ash.

（請求項３）
前記発酵原料が、糞尿、敷料、エネルギー作物、残飼、食品残渣、農作物残渣、汚泥から選ばれた１種又は２種以上を含むことを特徴とする請求項１又は２記載の液肥の製造方法。 (Claim 3)
The method for producing liquid fertilizer according to claim 1 or 2, wherein the fermentation raw material contains one or more selected from manure, bedding, energy crops, remnants, food residues, agricultural crop residues, and sludge. .

本発明によれば、Ｎ、Ｐ、Ｋのバランスが改善された液肥を製造することができる液肥の製造方法を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the liquid fertilizer which can manufacture the liquid fertilizer in which the balance of N, P, and K was improved can be provided.

本発明の液肥の製造方法を実施するための液肥の製造システムの一例を説明する図The figure explaining an example of the manufacturing system of the liquid fertilizer for enforcing the manufacturing method of the liquid fertilizer of this invention

本発明の液肥の製造方法は、発酵原料をメタン発酵させて得た消化液から液肥を製造する。その際、消化液を固液分離してメタン発酵残渣を分離回収する。固液分離手段は、格別限定される訳ではないが、例えば脱水機等が用いられる。   The method for producing liquid fertilizer according to the present invention produces liquid fertilizer from a digested liquid obtained by subjecting a fermentation raw material to methane fermentation. At that time, the digested liquid is separated into solid and liquid to separate and recover the methane fermentation residue. The solid-liquid separation means is not particularly limited, but for example, a dehydrator or the like is used.

前記メタン発酵残渣を必要により乾燥し、燃焼させて得られた灰の一部又は全部を、メタン発酵残渣が分離された後の前記消化液に添加・混合することにより、灰入りの液肥を製造できる。   Manufactured ash-containing liquid fertilizer by adding and mixing part or all of the ash obtained by drying and burning the methane fermentation residue if necessary and mixing it with the digested liquid after separation of the methane fermentation residue it can.

前記灰の添加により、前記液肥で不足しているリンを補填することは好ましいことである。前記発酵原料が、例えば糞尿、敷料、エネルギー作物、残飼、食品残渣、農作物残渣、汚泥から選ばれた１種又は２種以上を含む場合には、メタン発酵して得られる消化液には、Ｐ（リン）が不足し易い。前記灰が添加された液肥は、不足分のＰが補填され、例えばＮ、Ｐ、Ｋが１：１：１に近づき、Ｎ、Ｐ、Ｋバランスが改善される。   It is preferable to supplement phosphorus that is deficient in the liquid fertilizer by adding the ash. In the case where the fermentation raw material contains one or more selected from, for example, manure, litter, energy crops, remnants, food residues, agricultural crop residues, sludge, P (phosphorus) tends to be insufficient. The liquid fertilizer to which the ash is added is supplemented with a deficient amount of P. For example, N, P, and K approach 1: 1: 1, and the N, P, and K balance is improved.

詳述すると、上述した発酵原料、特に糞尿及び敷料を少なくとも含む発酵原料は、消化液が固液分離されて得られたスラリーを液肥として利用する場合に、リンが不足していることが実験的に確認されている。そして、その消化液から分離された固形分が燃焼されて得られた灰は、不足しているＰを含むがゆえに、その灰を消化液に混合すると、Ｐが補填され、例えばＮ、Ｐ、Ｋが１：１：１に近づき、Ｎ、Ｐ、Ｋバランスが改善される。   More specifically, the fermentation raw materials described above, particularly the fermentation raw materials including at least manure and bedding, are experimentally found to be deficient in phosphorus when a slurry obtained by solid-liquid separation of digestive juice is used as liquid fertilizer. Has been confirmed. And, the ash obtained by burning the solid content separated from the digestive liquid contains insufficient P. Therefore, when the ash is mixed with the digestive liquid, P is supplemented, for example, N, P, K approaches 1: 1: 1 and the N, P, K balance is improved.

上述したように発酵原料には糞尿及び敷料が含まれることが好ましい。敷料としては、家畜等の飼育スペースに敷かれて用いられた使用済み敷料が好適であり、稲や小麦等のようなイネ科植物の茎を乾燥させた藁からなるものを好ましく挙げることができる。糞尿としては、例えば、牛、豚、馬等の動物の糞尿を好ましく例示できる。発酵原料が、糞が付着した状態の敷料を含有することは、特に好ましいことである。   As described above, the fermentation raw material preferably contains manure and bedding. As the litter, a spent litter used in a breeding space such as livestock is suitable, and preferably a litter made of dried stalks of a gramineous plant such as rice or wheat can be preferably mentioned. . Preferred examples of manure include animal manure such as cows, pigs and horses. It is particularly preferred that the fermentation raw material contains a bedding with the feces attached.

また、発酵原料がエネルギー作物を含有することも好ましいことである。   It is also preferable that the fermentation raw material contains an energy crop.

エネルギー作物としては、例えば、イネ科、アオイ科、ミズアオイ科、アブラナ科、ヒユ科等の草本バイオマスを好ましく例示できる。イネ科の草本バイオマスとしては、例えば、ネピアグラス、サトウキビ、ギニアグラス、サトウキビ、バミューダグラス、ペレニアルライグラス、ソルガム、とうもろこし（実の部分以外）、イネ、エンバク、スイッチグラス、ジャイアントミスカンサス、エリアンサス等を好ましく例示できる。アオイ科の草本バイオマスとしては、例えばケナフ等を好ましく例示できる。ミズアオイ科の草本バイオマスとしては、例えばホテイアオイ等を好ましく例示できる。アブラナ科の草本バイオマスとしては、例えば菜種等を好ましく例示できる。ヒユ科の草本バイオマスとしては、例えばてん菜等を好ましく例示できる。   As an energy crop, for example, herbaceous biomass such as Gramineae, Mallowaceae, Cyprinaceae, Brassicaceae, Amaraceae can be preferably exemplified. As grass family biomass, for example, napiergrass, sugarcane, guineagrass, sugarcane, Bermudagrass, perennial ryegrass, sorghum, corn (other than the real part), rice, oat, switchgrass, Giant Miscanthus, Elianthus etc. Can be preferably exemplified. Preferred examples of herbaceous biomass of the mallow family include kenaf and the like. Preferred examples of herbaceous biomass in the family Azoaceae include water hyacinth. Preferred examples of the cruciferous herbaceous biomass include rapeseed. Preferred examples of herbaceous biomass include sugar beet.

更にエネルギー作物に関しては、“エネルギー作物としてのススキ属植物への期待”（北海道大学、山田敏彦、日本草地学会誌、５５（３）：２６３−２６９、発行日２００９年１０月）を参照できる。   Furthermore, regarding energy crops, “Expectations for Susuki plants as energy crops” (Hokkaido University, Toshihiko Yamada, Journal of the Japanese Society of Grassland Science, 55 (3): 263-269, published date October 2009) can be referred to.

エネルギー作物として例えば牧草等を用いることも好ましいことである。   It is also preferable to use grass for example as an energy crop.

次に、図面を参照して本発明を実施するための形態について更に詳しく説明する。   Next, embodiments for carrying out the present invention will be described in more detail with reference to the drawings.

図１は、本発明の液肥の製造方法を実施するための液肥の製造システムの一例を示す図である。   FIG. 1 is a diagram showing an example of a liquid fertilizer manufacturing system for carrying out the liquid fertilizer manufacturing method of the present invention.

ここでは、発酵原料が糞尿及び、糞が付着した状態の敷料を含有する場合について説明する。発酵原料は、消化液添加工程１に導入される。ここでは、発酵原料の水分含有量の調整が行われる。例えば、発酵原料に、後述する消化液等を混合し、撹拌することによって、水分含有量の調整を行うことが好ましい。   Here, the case where a fermentation raw material contains manure and the bedding in the state to which feces adhered is demonstrated. The fermentation raw material is introduced into the digestive juice addition step 1. Here, the moisture content of the fermentation raw material is adjusted. For example, it is preferable to adjust the water content by mixing a digestion liquid or the like described later with the fermentation raw material and stirring.

水分含有量の調整が行われた発酵原料は、固形分とスラリーを含み、固形分には敷料を含む。これらの原料は第１の固液分離工程２に導入され、敷料を含む固形分と、糞尿や有機物含有廃液等からなるスラリーとに分離される。   The fermentation raw material whose water content has been adjusted includes a solid content and a slurry, and the solid content includes a bedding. These raw materials are introduced into the first solid-liquid separation step 2 and separated into a solid content including a bedding and a slurry composed of manure, organic matter-containing waste liquid or the like.

固形分は、破砕工程３に導入される。ここでは、敷料を破砕して、断片化する。例えば、発酵原料が、糞が付着した状態の敷料を含有する場合、上述した固液分離により、敷料から糞が剥離されるため、敷料の破砕効率を向上することができる。   The solid content is introduced into the crushing step 3. Here, the litter is crushed and fragmented. For example, in the case where the fermentation raw material contains a bedding in a state where feces are attached, since the feces are separated from the bedding by the solid-liquid separation described above, the crushing efficiency of the bedding can be improved.

断片化された敷料を含む固形分は、混合工程４に導入され、第１の固液分離工程２で分離されたスラリー分と混合される。   The solid content including the fragmented bedding is introduced into the mixing step 4 and mixed with the slurry portion separated in the first solid-liquid separation step 2.

混合工程４を経た発酵原料は、メタン発酵工程５に導入される。ここでは、発酵原料をメタン発酵し、消化液を生成する。かかるメタン発酵に伴って発生するバイオガスを回収する。   The fermentation raw material that has undergone the mixing step 4 is introduced into the methane fermentation step 5. Here, the fermentation raw material is subjected to methane fermentation to produce a digestive juice. The biogas generated with such methane fermentation is recovered.

断片化された敷料は、メタン発酵に際してメタンガスの生成に好適に寄与するが、完全に分解されることはなく、断片としての形状をとどめる。   The fragmented bedding favorably contributes to the production of methane gas during methane fermentation, but is not completely decomposed and remains in the form of fragments.

メタン発酵後の消化液は、第２の固液分離工程６に導入される。ここでは、消化液からメタン発酵残渣を分離する。メタン発酵残渣は、発酵処理された敷料を含有している。   The digested liquid after methane fermentation is introduced into the second solid-liquid separation step 6. Here, the methane fermentation residue is separated from the digestive juice. The methane fermentation residue contains a fermented litter.

メタン発酵残渣が分離された消化液は、殺菌工程７に導入し、殺菌処理を施すことも好ましい。殺菌処理としては、加熱殺菌が好適に用いられる。   It is also preferable that the digestive juice from which the methane fermentation residue is separated is introduced into the sterilization step 7 and sterilized. As the sterilization treatment, heat sterilization is preferably used.

また、メタン発酵残渣が分離された消化液の一部は、上述した消化液添加工程１に返送され、発酵原料の水分含有量の調整に用いることができる。   Moreover, a part of digestive liquid from which the methane fermentation residue was separated is returned to the above-described digestive liquid addition step 1 and can be used for adjusting the water content of the fermentation raw material.

一方、第２の固液分離工程６で得たメタン発酵残渣は、乾燥工程８に導入される。ここでは、メタン発酵残渣に含まれる水分を蒸発させて乾燥する。   On the other hand, the methane fermentation residue obtained in the second solid-liquid separation step 6 is introduced into the drying step 8. Here, the moisture contained in the methane fermentation residue is evaporated and dried.

乾燥工程８において乾燥されたメタン発酵残渣は、成形工程９に導入される。ここでは、メタン発酵残渣を圧縮成形等により成形する。メタン発酵残渣を、例えば、ペレット燃料等に成形することが好ましい。発酵処理された敷料は、燃料としての機能に優れる。成形工程９は適宜省略することができ、直接燃焼工程１０に供されてもよい。メタン発酵残渣の燃料としての保存性や取扱い性を高める観点では、成形工程９による成形を行うことが好ましいが、これに限定されない。   The methane fermentation residue dried in the drying step 8 is introduced into the molding step 9. Here, the methane fermentation residue is formed by compression molding or the like. The methane fermentation residue is preferably formed into, for example, pellet fuel. The fermented litter is excellent in function as a fuel. The molding step 9 can be omitted as appropriate, and may be directly applied to the combustion step 10. From the viewpoint of enhancing the storage stability and handling properties of the methane fermentation residue as a fuel, it is preferable to perform molding by the molding step 9, but the present invention is not limited to this.

また、乾燥工程８において乾燥されたメタン発酵残渣の一部は、敷料として回収することもできる。即ち、発酵処理された敷料は、敷料として好適に再利用することもできる。   Moreover, a part of methane fermentation residue dried in the drying process 8 can also be collect | recovered as a litter. That is, the fermented litter can be suitably reused as a litter.

乾燥工程８または成形工程９を経たメタン発酵残渣は、燃焼工程１０に導入される。ここでは、メタン発酵残渣を燃焼して灰を生成する。   The methane fermentation residue that has undergone the drying process 8 or the molding process 9 is introduced into the combustion process 10. Here, the methane fermentation residue is burned to produce ash.

本発明では、回収した灰を、メタン発酵残渣が分離された後の消化液に添加することにより、得られる液肥のＮ、Ｐ、Ｋバランスの調整を行う。   In this invention, N, P, and K balance of the liquid fertilizer obtained are adjusted by adding the collect | recovered ash to the digestive liquid after a methane fermentation residue is isolate | separated.

また、燃焼工程１０での燃焼により発生する熱を回収することは好ましいことである。メタン発酵残渣に含有される発酵処理された敷料は、上述したメタン発酵に際して一部が分解されているが、十分な燃焼熱を発生することができる。そのため、これを燃焼させることによって、多くの熱を回収することができる。   In addition, it is preferable to recover the heat generated by the combustion in the combustion process 10. Part of the fermented litter contained in the methane fermentation residue is decomposed during the above-described methane fermentation, but can generate sufficient combustion heat. Therefore, a lot of heat can be recovered by burning it.

回収した熱を利用して、前述の液肥の加熱殺菌を行うことも好ましい。図示の例では、回収した熱を利用して、殺菌工程７における加熱殺菌を行うようにしている。また、回収した熱を利用して、該液肥の水分を蒸発させて濃縮を行うこともできる。燃焼により発生する熱は高温であるため、上述した加熱殺菌や濃縮に好適に利用できる。   It is also preferable to sterilize the liquid fertilizer using the recovered heat. In the illustrated example, heat sterilization in the sterilization step 7 is performed using the recovered heat. Moreover, it can also concentrate by evaporating the water | moisture content of this liquid manure using the collect | recovered heat | fever. Since the heat generated by the combustion is high, it can be suitably used for the heat sterilization and concentration described above.

更に、図示するように、燃焼工程１０での燃焼により発生する熱を回収し、乾燥工程８でのメタン発酵残渣の乾燥のための熱源として利用することもできる。またメタン発酵工程５の加温のための熱源として利用することもできる。このように燃焼工程１０での燃焼により発生する熱は当該システム内において多目的に利用できる。   Furthermore, as illustrated, the heat generated by the combustion in the combustion process 10 can be recovered and used as a heat source for drying the methane fermentation residue in the drying process 8. It can also be used as a heat source for heating in the methane fermentation process 5. Thus, the heat generated by the combustion in the combustion process 10 can be used for multiple purposes in the system.

以下に、本発明の実施例について説明するが、本発明はかかる実施例により限定されない。   Examples of the present invention will be described below, but the present invention is not limited to these examples.

（実施例１）
図１に示した液肥の製造システムを用いて、液肥の製造を行った。 Example 1
The liquid fertilizer was manufactured using the liquid fertilizer manufacturing system shown in FIG.

なお、以下の説明において、具体的な収支バランスは、発酵原料１００ｔを処理する場合を基準とする。   In the following description, the specific balance of payment is based on the case where the fermentation raw material 100t is processed.

まず、糞が付着した状態の敷料を含有する発酵原料１００ｔを、消化液添加工程１に導入した。消化液添加工程１において発酵原料１００ｔを消化液８５ｔで希釈した。   First, the fermentation raw material 100t containing the litter with the feces attached thereto was introduced into the digestive fluid addition step 1. In the digestive fluid addition step 1, the fermentation raw material 100t was diluted with the digestive fluid 85t.

次いで、希釈後の発酵原料１８５ｔを、第１の固液分離工程２に導入し、洗浄水２．５ｔを使用しながら、固液分離を行った。これにより、敷料を含む固形分と、スラリー分とを得た。   Next, the diluted fermentation raw material 185t was introduced into the first solid-liquid separation step 2, and solid-liquid separation was performed using 2.5t of washing water. As a result, a solid content including a litter and a slurry content were obtained.

敷料を含む固形分は、破砕工程３に導入して断片化した。断片化された敷料は、混合工程４に導入され、第１の固液分離工程２で分離されたスラリー分と混合した。   The solid content including the bedding was introduced into the crushing step 3 and fragmented. The fragmented litter was introduced into the mixing step 4 and mixed with the slurry portion separated in the first solid-liquid separation step 2.

混合工程４を経た発酵原料を、メタン発酵工程５に導入した。ここでは、発酵原料をメタン発酵し、４ｔのバイオガスを回収した。かかる発酵に伴って消化液１８３．５ｔを得た。   The fermentation raw material which passed through the mixing process 4 was introduced into the methane fermentation process 5. Here, the fermentation raw material was subjected to methane fermentation, and 4 t of biogas was recovered. Along with this fermentation, 183.5 t of digestive juice was obtained.

メタン発酵後の消化液１８３．５ｔを、第２の固液分離工程６に導入し、メタン発酵残渣３２ｔと、メタン発酵残渣が分離された消化液１５１．５ｔとに分離した。メタン発酵残渣は、発酵処理された敷料を含有している。   The digested liquid 183.5t after methane fermentation was introduced into the second solid-liquid separation step 6, and separated into a methane fermentation residue 32t and a digested liquid 151.5t from which the methane fermentation residue was separated. The methane fermentation residue contains a fermented litter.

メタン発酵残渣が分離された消化液の一部８５ｔは、上述した消化液添加工程１に返送した。   A portion 85t of the digestive liquid from which the methane fermentation residue was separated was returned to the digestive liquid addition step 1 described above.

残りの消化液６６．５ｔは殺菌工程７に導入し、殺菌処理を施した。   The remaining 66.5 t of digestive juice was introduced into the sterilization step 7 and sterilized.

一方、第２の固液分離工程６で得たメタン発酵残渣３２ｔは、乾燥工程８に導入され、水分を蒸発させて乾燥することにより、１４ｔになった。   On the other hand, the methane fermentation residue 32t obtained in the second solid-liquid separation step 6 was introduced into the drying step 8 and evaporated to dry the moisture, resulting in 14t.

一部の乾燥されたメタン発酵残渣を敷料（２ｔ）として回収した。残りのメタン発酵残渣１２ｔを成形工程９に導入し、ペレット状に成形した。このペレット状のメタン発酵残渣１２ｔを、燃焼工程１０に導入して燃焼し、灰２．２ｔを得た。   A portion of the dried methane fermentation residue was recovered as a bedding (2t). The remaining methane fermentation residue 12t was introduced into the molding step 9 and molded into a pellet. This pellet-like methane fermentation residue 12t was introduced into the combustion process 10 and burned to obtain 2.2t of ash.

得られた灰２．２ｔを、上述した消化液６６．５ｔに添加することにより、得られる液肥６８．７ｔのＮ、Ｐ、Ｋバランスの調整を行った。消化液、灰、及び灰添加後の消化液（液肥）におけるＮ、Ｐ、Ｋバランスを表１に示した。   By adding the obtained ash 2.2t to the above-mentioned digestive juice 66.5t, the N, P, K balance of the obtained liquid manure 68.7t was adjusted. Table 1 shows the N, P, and K balance in the digestive fluid, ash, and the digested fluid (liquid fertilizer) after ash addition.

Figure 2017019702
Figure 2017019702

＜評価＞
表１に示すように、調整前の消化液は、窒素及びカリウムに対して、リンの含有量が比較的小さい。 <Evaluation>
As shown in Table 1, the digestive liquid before the adjustment has a relatively small phosphorus content relative to nitrogen and potassium.

一方、発酵原料をメタン発酵させた後のメタン発酵残渣を燃焼させて得た灰は、リンを多く含んでいる。   On the other hand, the ash obtained by burning the methane fermentation residue after subjecting the fermentation raw material to methane fermentation contains a large amount of phosphorus.

前記消化液に前記灰を添加した調整後の液肥は、リンの不足が補填され、窒素、リン及びカリウムの各含有量（／重量）の比率（Ｎ、Ｐ、Ｋ）が、調整前と比較して１：１：１に近づくことがわかる。   The liquid fertilizer after the addition of the ash to the digestive liquid is compensated for the lack of phosphorus, and the ratio (N, P, K) of each content (/ weight) of nitrogen, phosphorus and potassium is compared with that before the adjustment. It turns out that it approaches 1: 1: 1.

即ち、調整前の消化液における窒素、リン及びカリウムの各含有量間の標準偏差は、４２．９であるのに対して、灰添加後の液肥における窒素、リン及びカリウムの各含有量間の標準偏差は、４１．５であり、ゼロに近づいている。   That is, the standard deviation between the contents of nitrogen, phosphorus and potassium in the digestive juice before adjustment is 42.9, while the contents of nitrogen, phosphorus and potassium in the liquid fertilizer after ash addition are between The standard deviation is 41.5, approaching zero.

得られた液肥における窒素、リン及びカリウムの各濃度（−ｗｅｔ）は、０．１０重量％、０．１２重量％及び０．２３重量％であった。   Each concentration (-wet) of nitrogen, phosphorus and potassium in the obtained liquid fertilizer was 0.10% by weight, 0.12% by weight and 0.23% by weight.

１：消化液添加工程
２：第１の固液分離工程
３：破砕工程
４：混合工程
５：メタン発酵工程
６：第２の固液分離工程
７：殺菌工程
８：乾燥工程
９：成形工程
１０：燃焼工程 1: Digestive liquid addition process 2: First solid-liquid separation process 3: Crushing process 4: Mixing process 5: Methane fermentation process 6: Second solid-liquid separation process 7: Sterilization process 8: Drying process 9: Molding process 10 : Combustion process

Claims (3)

発酵原料をメタン発酵させて得られた消化液から液肥を製造する際に、
前記消化液を固液分離してメタン発酵残渣を分離し、
前記メタン発酵残渣を燃焼させて得られた灰を、前記メタン発酵残渣が分離された後の前記消化液に添加し、混合することを特徴とする液肥の製造方法。 When producing liquid fertilizer from digestive juice obtained by methane fermentation of fermentation raw materials,
Solid digestion of the digestive juice to separate methane fermentation residue,
A method for producing liquid fertilizer, comprising adding the ash obtained by burning the methane fermentation residue to the digested liquid after the methane fermentation residue is separated and mixing the ash. 前記灰の添加により、前記液肥のリンを補填することを特徴とする請求項１記載の液肥の製造方法。   The method for producing liquid fertilizer according to claim 1, wherein phosphorus is added to the liquid fertilizer by adding the ash. 前記発酵原料が、糞尿、敷料、エネルギー作物、残飼、食品残渣、農作物残渣、汚泥から選ばれた１種又は２種以上を含むことを特徴とする請求項１又は２記載の液肥の製造方法。   The method for producing liquid fertilizer according to claim 1 or 2, wherein the fermentation raw material contains one or more selected from manure, litter, energy crops, remnants, food residues, agricultural crop residues, and sludge. .
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