JP2000271598A - Anaerobic treatment method of organic sludge - Google Patents
Anaerobic treatment method of organic sludgeInfo
- Publication number
- JP2000271598A JP2000271598A JP11080007A JP8000799A JP2000271598A JP 2000271598 A JP2000271598 A JP 2000271598A JP 11080007 A JP11080007 A JP 11080007A JP 8000799 A JP8000799 A JP 8000799A JP 2000271598 A JP2000271598 A JP 2000271598A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- acid fermentation
- treatment
- anaerobic
- organic sludge
- 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.)
- Pending
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000855 fermentation Methods 0.000 claims abstract description 51
- 230000004151 fermentation Effects 0.000 claims abstract description 51
- 239000002253 acid Substances 0.000 claims abstract description 44
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003513 alkali Substances 0.000 claims abstract description 18
- 230000029087 digestion Effects 0.000 claims abstract description 10
- 230000003381 solubilizing effect Effects 0.000 claims abstract description 6
- 238000000354 decomposition reaction Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000002708 enhancing effect Effects 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 101100219325 Phaseolus vulgaris BA13 gene Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は有機性汚泥の処理方
法、特に有機性汚泥の嫌気性消化による処理方法に関す
るものである。The present invention relates to a method for treating organic sludge, and more particularly to a method for treating organic sludge by anaerobic digestion.
【０００２】[0002]
【従来の技術】有機性汚泥の処理方法としては、好気性
消化により有機性汚泥の減容化を図る方式もあるが、従
来から嫌気性消化方式が多用されている。なぜなら、嫌
気性消化方式は処理費用が安価であり、かつエネルギー
として有用なメタン等のバイオガスを回収できるという
利点があるからである。2. Description of the Related Art As a method for treating organic sludge, there is a method for reducing the volume of organic sludge by aerobic digestion, but an anaerobic digestion method has been frequently used. This is because the anaerobic digestion method has the advantages that the processing cost is low and that biogas such as methane useful as energy can be recovered.
【０００３】[0003]
【発明が解決しようとする課題】このように有機性汚泥
の嫌気性消化は従来から多用されてきた技術であるが、
上述したような利点を有する一方、分解に長時間を要す
ることや、分解率そのものにも限界があり、エネルギー
回収の面からも満足のいく状況ではないという課題が残
されていた。As described above, anaerobic digestion of organic sludge is a technique that has been frequently used.
While having the above-mentioned advantages, there is a problem that the decomposition takes a long time and the decomposition rate itself is limited, and the situation is not satisfactory in terms of energy recovery.
【０００４】本発明の目的は、これらの課題を克服し、
有機性汚泥の分解率を高めて汚泥処分費を低減すること
ができ、かつエネルギー回収（メタン等のバイオガス生
成量）の面でも有効な、有機性汚泥の嫌気性消化による
処理方法を提供することにある。[0004] It is an object of the present invention to overcome these problems,
Provided is a method for treating organic sludge by anaerobic digestion, which can increase the decomposition rate of organic sludge and reduce sludge disposal costs, and is also effective in terms of energy recovery (amount of biogas such as methane). It is in.
【０００５】[0005]
【課題を解決するための手段】本発明者は上述の課題を
解決すべく検討した結果、下記の手段により上記目的を
達成できることを見いだし、本発明を完成した。すなわ
ち本発明の有機性汚泥の嫌気性処理方法は、有機性汚泥
をアルカリ処理し、次いで酸発酵処理することを特徴と
するものである。The present inventor has studied to solve the above-mentioned problems, and as a result, has found that the above-mentioned object can be achieved by the following means, and has completed the present invention. That is, the anaerobic treatment method of the organic sludge of the present invention is characterized by treating the organic sludge with an alkali, followed by an acid fermentation treatment.
【０００６】[0006]
【発明の実施の形態】本発明において、好ましくは、ア
ルカリ処理工程はｐＨ１１以上のアルカリ条件下で汚泥
を化学的に可溶化する工程からなり、酸発酵処理工程は
ｐＨ１１以下の条件下で汚泥を生物的に可溶化する工程
からなる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, preferably, the alkali treatment step comprises a step of chemically solubilizing sludge under alkaline conditions of pH 11 or more, and the acid fermentation treatment step preferably comprises sludge treatment under conditions of pH 11 or less. It comprises a biologically solubilizing step.
【０００７】また上記の酸発酵処理工程は、ｐＨの異な
る複数の槽からなり、第１段目の酸発酵槽のｐＨを９〜
１１に維持することが好ましく、ほぼｐＨ１０に維持す
ることが特に好ましい。The above-mentioned acid fermentation treatment step comprises a plurality of tanks having different pHs.
It is preferably maintained at 11 and particularly preferably at about pH 10.
【０００８】また上記の酸発酵処理工程において、第１
段目の酸発酵槽に後段の嫌気性消化後の分離汚泥および
／または活性汚泥を添加することが好ましい。これは、
酸発酵処理工程の第１槽目をｐＨ１１以下に調整すると
ともに、種菌を供給して酸発酵を進行しやすくするため
である。In the above-mentioned acid fermentation treatment step, the first
It is preferable to add the separated sludge after the anaerobic digestion in the second stage and / or the activated sludge to the second stage acid fermentation tank. this is,
This is because the first tank in the acid fermentation treatment step is adjusted to have a pH of 11 or less and a seed fungus is supplied to facilitate the acid fermentation.
【０００９】すなわち図１に示すように、汚泥の生物的
可溶化はｐＨが高いほど進行しやすいが、酸発酵活性は
ｐＨ１０のときが最も高いことに基づくものである。That is, as shown in FIG. 1, the biological solubilization of sludge is more likely to proceed as the pH is higher, but the acid fermentation activity is based on the highest pH at pH 10.
【００１０】したがって、酸発酵処理工程の第１槽目
（第１酸発酵槽）をｐＨ１０程度に制御することが好ま
しく、第２槽目（第２酸発酵槽）以降では、酸発酵の進
行とともにｐＨが徐々に低下し、後段のメタン発酵槽に
流入する時点でｐＨ７程度になるよう酸発酵処理工程の
ｐＨ条件を管理することが好ましい。[0010] Therefore, it is preferable to control the pH of the first tank (first acid fermentation tank) of the acid fermentation treatment step to about pH 10, and from the second tank (second acid fermentation tank) onwards, the acid fermentation proceeds. It is preferable to control the pH conditions of the acid fermentation treatment step so that the pH gradually decreases and becomes about pH 7 when flowing into the methane fermentation tank at the subsequent stage.
【００１１】なお、アルカリ処理工程の温度については
特に上限はないが、酸発酵処理工程の温度については７
０℃程度が限界である。There is no particular upper limit on the temperature of the alkali treatment step, but the temperature of the acid fermentation treatment step is 7 ° C.
The limit is about 0 ° C.
【００１２】また、本発明の嫌気性処理は、通常、酸発
酵処理およびそれに続くメタン発酵処理からなる。そし
て、本発明の嫌気性処理のあとに、活性汚泥処理するこ
とも好ましい。The anaerobic treatment of the present invention usually comprises an acid fermentation treatment followed by a methane fermentation treatment. And it is also preferable to perform an activated sludge treatment after the anaerobic treatment of the present invention.
【００１３】[0013]
【実施例】以下に実施例を挙げて本発明をさらに詳しく
説明するが、本発明はこれによって何ら限定されるもの
ではない。図２は、本発明の有機性汚泥の嫌気性処理方
法の一実施の形態を示す処理フローである。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. FIG. 2 is a process flow showing one embodiment of the anaerobic treatment method for organic sludge of the present invention.
【００１４】図２の処理フローに示すように、活性汚泥
処理の余剰汚泥１は、アルカリ処理工程において、アル
カリ処理装置２に導入され、苛性ソーダなどのアルカリ
剤３の添加により化学的に可溶化される。As shown in the processing flow of FIG. 2, the excess sludge 1 in the activated sludge treatment is introduced into an alkali treatment device 2 in an alkali treatment step, and is chemically solubilized by the addition of an alkaline agent 3 such as caustic soda. You.
【００１５】アルカリ処理された汚泥４は、酸発酵処理
工程に送られ、メタン発酵の分離汚泥５（または図示し
てない活性汚泥）が導入される第１酸発酵槽６において
槽内ｐＨ約１０の条件下で酸発酵処理が行われる。The alkali-treated sludge 4 is sent to an acid fermentation treatment step, and the pH in the first acid fermentation tank 6 into which the separated sludge 5 of methane fermentation (or activated sludge (not shown)) is introduced is about 10%. The acid fermentation treatment is performed under the following conditions.
【００１６】次いで第２酸発酵槽７にてｐＨ７程度まで
ｐＨを下げた後、汚泥はメタン発酵槽８に流入して処理
される。なお、メタン発酵槽８のｐＨは、有機酸の消費
に伴いｐＨが上昇するため、酸１１により中性付近に維
持することが好ましい。Next, after the pH is lowered to about pH 7 in the second acid fermentation tank 7, the sludge flows into the methane fermentation tank 8 for treatment. The pH of the methane fermenter 8 is preferably maintained near neutrality with the acid 11 because the pH rises with the consumption of the organic acid.
【００１７】〈実施例１〉実施例１では、図２の処理フ
ローに従って、活性汚泥処理の余剰汚泥を用いて嫌気性
消化処理を行った。<Example 1> In Example 1, anaerobic digestion treatment was performed using excess sludge of activated sludge treatment according to the processing flow of FIG.
【００１８】〈比較例１〉比較例１では、アルカリ処理
後にｐＨ中性で酸発酵処理を行った。すなわち、実施例
１と同様に活性汚泥処理の余剰汚泥を用いてアルカリ処
理を行った後に、汚泥をｐＨ中性の酸発酵槽による酸発
酵処理および実施例１と同様のメタン発酵処理をおこな
った。従って、比較例１では、ｐＨ約１０の酸発酵槽
（実施例１の第１酸発酵槽）ははぶかれている。Comparative Example 1 In Comparative Example 1, an acid fermentation treatment was performed at pH neutral after alkali treatment. That is, after performing the alkali treatment using the excess sludge of the activated sludge treatment as in Example 1, the sludge was subjected to an acid fermentation treatment in a pH-neutral acid fermentation tank and a methane fermentation treatment as in Example 1. . Therefore, in Comparative Example 1, the acid fermentation tank having a pH of about 10 (the first acid fermentation tank in Example 1) was broken.
【００１９】〈比較例２〉比較例２では、アルカリ処理
を行わずにｐＨ中性で酸発酵処理を行った。すなわち、
実施例１と同様の活性汚泥処理の余剰汚泥をアルカリ処
理を行わずに、ｐＨ中性の酸発酵処理およびメタン発酵
処理をおこなった。従って、比較例２では、アルカリ処
理およびｐＨ約１０の酸発酵槽（実施例１の第１酸発酵
槽）ははぶかれている。Comparative Example 2 In Comparative Example 2, an acid fermentation treatment was carried out at a neutral pH without performing an alkali treatment. That is,
Excess sludge of the activated sludge treatment similar to that in Example 1 was subjected to pH-neutral acid fermentation treatment and methane fermentation treatment without performing alkali treatment. Therefore, in Comparative Example 2, the acid fermentation tank having the alkali treatment and the pH of about 10 (the first acid fermentation tank of Example 1) was broken.
【００２０】実施例１並びに比較例１及び比較例２の処
理条件と処理結果を表１および表２に示す。Tables 1 and 2 show the processing conditions and results of Example 1 and Comparative Examples 1 and 2.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【発明の効果】以上説明したように、本発明の有機性汚
泥の嫌気性処理方法によれば、有機性汚泥の分解率が向
上するため汚泥処分費を低減することができ、かつエネ
ルギー回収（メタン等のバイオガス生成量）の面でも優
れた効果を奏する。As described above, according to the anaerobic treatment method for organic sludge of the present invention, the decomposition rate of organic sludge is improved, so that sludge disposal costs can be reduced and energy recovery ( It is also excellent in terms of the amount of biogas produced such as methane.
【図１】酸発酵処理工程における汚泥の液化および有機
酸の生成量に及ぼすｐＨの影響を示すグラフである。FIG. 1 is a graph showing the effect of pH on sludge liquefaction and organic acid production in an acid fermentation treatment step.
【図２】本発明の有機性汚泥の嫌気性処理方法の一実施
例を示す処理フローである。FIG. 2 is a process flow showing one embodiment of an organic sludge anaerobic treatment method of the present invention.
【符号の説明】 １： 活性汚泥処理の余剰汚泥 ２： アルカリ処理装置 ３： アルカリ剤 ４： アルカリ処理された汚泥 ５： メタン発酵の分離汚泥 ６： 第１酸発酵槽 ７： 第２酸発酵槽 ８： メタン発酵槽 ９： バイオガス １０： 分離水 １１： 酸[Description of Signs] 1: Excess sludge of activated sludge treatment 2: Alkali treatment device 3: Alkali agent 4: Alkali-treated sludge 5: Separated sludge of methane fermentation 6: First acid fermentation tank 7: Second acid fermentation tank 8: Methane fermentation tank 9: Biogas 10: Separated water 11: Acid
───────────────────────────────────────────────────── フロントページの続き (72)発明者 米山 豊 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 (72)発明者 鈴木 隆幸 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 Ｆターム(参考） 4D059 AA05 BA13 BF14 BK12 DA01 EB05 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Yoneyama 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation (72) Inventor Takayuki Suzuki 11-1 Haneda Asahi-cho, Ota-ku, Tokyo EBARA F-term (reference) 4D059 AA05 BA13 BF14 BK12 DA01 EB05
Claims (5)
発酵処理することを特徴とする有機性汚泥の嫌気性処理
方法。1. An anaerobic treatment method for organic sludge, comprising subjecting organic sludge to alkali treatment and then to acid fermentation treatment.
カリ条件下で汚泥を化学的に可溶化する工程からなり、
酸発酵処理工程がｐＨ１１以下の条件下で汚泥を生物的
に可溶化する工程からなることを特徴とする請求項１に
記載の有機性汚泥の嫌気性処理方法。2. The alkaline treatment step comprises a step of chemically solubilizing sludge under alkaline conditions of pH 11 or more,
The anaerobic treatment method for organic sludge according to claim 1, wherein the acid fermentation treatment step comprises a step of biologically solubilizing the sludge under the condition of pH 11 or less.
からなり、第１段目の酸発酵槽のｐＨを９〜１１に維持
することを特徴とする請求項１または請求項２に記載の
有機性汚泥の嫌気性処理方法。3. The method according to claim 1, wherein the acid fermentation treatment step comprises a plurality of tanks having different pHs, and the pH of the first acid fermentation tank is maintained at 9 to 11. Anaerobic treatment method of organic sludge.
離汚泥および／または活性汚泥を添加することを特徴と
する請求項３に記載の有機性汚泥の嫌気性処理方法。4. The method for anaerobically treating organic sludge according to claim 3, wherein the separated sludge after anaerobic digestion and / or activated sludge is added to the first-stage acid fermentation tank.
くメタン発酵処理からなることを特徴とする請求項１〜
４のいずれか１項に記載の有機性汚泥の嫌気性処理方
法。5. The anaerobic treatment comprises an acid fermentation treatment followed by a methane fermentation treatment.
4. The method for anaerobic treatment of organic sludge according to any one of 4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11080007A JP2000271598A (en) | 1999-03-24 | 1999-03-24 | Anaerobic treatment method of organic sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11080007A JP2000271598A (en) | 1999-03-24 | 1999-03-24 | Anaerobic treatment method of organic sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000271598A true JP2000271598A (en) | 2000-10-03 |
Family
ID=13706285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11080007A Pending JP2000271598A (en) | 1999-03-24 | 1999-03-24 | Anaerobic treatment method of organic sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000271598A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6773597B2 (en) * | 2000-10-06 | 2004-08-10 | Able Co., Ltd. | Method and apparatus for reducing excess sludge |
| JP2006231334A (en) * | 2004-05-31 | 2006-09-07 | Osaka Gas Co Ltd | Organic waste processing method and organic waste processing apparatus |
| JP2006247601A (en) * | 2005-03-14 | 2006-09-21 | Tokyo Gas Co Ltd | Methane generation method and methane generator |
| US7560027B2 (en) | 2002-07-03 | 2009-07-14 | Jfe Engineering Corporation | Method for treating wastewater and sludge |
| CN104445849A (en) * | 2014-12-12 | 2015-03-25 | 济南大学 | Method for producing short-chain fatty acid employing combined pretreatment of activated sludge |
-
1999
- 1999-03-24 JP JP11080007A patent/JP2000271598A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6773597B2 (en) * | 2000-10-06 | 2004-08-10 | Able Co., Ltd. | Method and apparatus for reducing excess sludge |
| US7560027B2 (en) | 2002-07-03 | 2009-07-14 | Jfe Engineering Corporation | Method for treating wastewater and sludge |
| JP2006231334A (en) * | 2004-05-31 | 2006-09-07 | Osaka Gas Co Ltd | Organic waste processing method and organic waste processing apparatus |
| JP2006247601A (en) * | 2005-03-14 | 2006-09-21 | Tokyo Gas Co Ltd | Methane generation method and methane generator |
| CN104445849A (en) * | 2014-12-12 | 2015-03-25 | 济南大学 | Method for producing short-chain fatty acid employing combined pretreatment of activated sludge |
| CN104445849B (en) * | 2014-12-12 | 2016-04-20 | 济南大学 | A kind of combined pretreatment active sludge produces the method for short chain fatty acid |
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