JP2000237787A - Anaerobic treatment device of oil and fat-containing waste water - Google Patents
Anaerobic treatment device of oil and fat-containing waste waterInfo
- Publication number
- JP2000237787A JP2000237787A JP4202399A JP4202399A JP2000237787A JP 2000237787 A JP2000237787 A JP 2000237787A JP 4202399 A JP4202399 A JP 4202399A JP 4202399 A JP4202399 A JP 4202399A JP 2000237787 A JP2000237787 A JP 2000237787A
- Authority
- JP
- Japan
- Prior art keywords
- fat
- treatment
- oil
- fats
- oils
- 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
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
-
- 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
Landscapes
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水、し尿、食品
工場及び畜産などの分野の有機性排水、有機性廃棄物の
嫌気性消化処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for anaerobic digestion of organic wastewater and organic waste in fields such as sewage, human waste, food factories and livestock.
【０００２】[0002]
【従来の技術】油脂含有有機性排水を生物処理する場
合、従来は図２のフローシートに示すような処理を行っ
ていた。ここで、油脂とはトリグリセライドを含んだ油
脂からステアリン酸等の高級脂肪酸までのものすべてを
含んだものを指す。ＣＡＳＥ−１は高濃度油脂含有排水
を油脂分離槽で分離し、その分離水と油脂を含まない有
機性排水を混合し、好気性処理あるいは嫌気性処理＋好
気性処理を行うケースである。ＣＡＳＥ−２は高濃度油
脂を分離せずに他の排水と混合され、総合排水として好
気性処理あるいは嫌気性処理＋好気性処理を行うケース
である。なお図２において、１は高濃度油脂含有排水、
４は油脂を含まない有機性排水、７は処理水、８は油脂
分離槽、９は廃棄油脂、１０は好気性処理槽、１１は嫌
気性処理槽を示す。2. Description of the Related Art Conventionally, when an organic wastewater containing fats and oils is biologically treated, a treatment as shown in a flow sheet of FIG. 2 has been performed. Here, fats and oils refer to those containing everything from fats and oils containing triglycerides to higher fatty acids such as stearic acid. CASE-1 is a case in which a high-concentration oil / fat-containing wastewater is separated in a fat / oil separation tank, and the separated water and an organic wastewater containing no fat / oil are mixed to perform aerobic treatment or anaerobic treatment + aerobic treatment. CASE-2 is a case in which high-concentration fats and oils are mixed with other wastewater without separation, and aerobic treatment or anaerobic treatment + aerobic treatment is performed as comprehensive wastewater. In FIG. 2, reference numeral 1 denotes a high-concentration oil / fat-containing wastewater,
Reference numeral 4 denotes an organic wastewater containing no fat, 7 denotes treated water, 8 denotes a fat / oil separation tank, 9 denotes waste oil / fat, 10 denotes an aerobic treatment tank, and 11 denotes an anaerobic treatment tank.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ＣＡＳ
Ｅ−１の場合、油脂分離槽で分離した油脂の廃棄処理を
行う必要があった。ＣＡＳＥ−２では、油脂含有率が高
い場合は、好気性処理では処理後発生する余剰汚泥の脱
水処理が困難なこと、嫌気性処理では油脂分解に時間が
かかり装置が大きくなるという問題点があった。油脂
は、本来単位重量当りのカロリーが高いため、嫌気性処
理が円滑にできればメタンガス回収率を高めることがで
きる。本発明の目的は、上記問題点を解決するにするこ
とにあり、油脂を含む有機性廃水をできるだけ前処理す
ることでメタン発酵処理におけるガス回収率を高め、安
定したメタン発酵処理を提供することである。SUMMARY OF THE INVENTION However, CAS
In the case of E-1, it was necessary to dispose of the fats and oils separated in the fat and oil separation tank. CASE-2 has a problem that when the fat content is high, it is difficult to dehydrate excess sludge generated after the treatment in the aerobic treatment, and it takes time to decompose the fat and oil in the anaerobic treatment, and the apparatus becomes large. Was. Since fats and oils originally have high calories per unit weight, if the anaerobic treatment can be performed smoothly, the methane gas recovery rate can be increased. An object of the present invention is to solve the above problems, to increase the gas recovery rate in methane fermentation by pretreating organic wastewater containing fats and oils as much as possible, and to provide a stable methane fermentation treatment. It is.
【０００４】[0004]
【課題を解決するための手段】本発明者等は、高濃度油
脂含有廃水の嫌気性処理方法について鋭意研究を行い、
高濃度油脂含有有機性排水を先ず前処理として酸発酵処
理し、次いでこの前処理水に油脂を含まない有機性排水
を混合し、この混合排水をメタン発酵処理すれば、油脂
の廃棄処理を行う必要なく、しかも油脂分解時間が短縮
できるため小型の装置で高いＣＯＤ除去率が得られるこ
とを知見し、本発明を完成するに到った。Means for Solving the Problems The present inventors have conducted intensive studies on anaerobic treatment methods for wastewater containing high-concentration fats and oils,
The high-concentration oil-containing organic wastewater is first subjected to an acid fermentation treatment as a pretreatment, and then the pretreatment water is mixed with an organic wastewater containing no oil and fat. The inventors have found that a high COD removal rate can be obtained with a small-sized device because it is unnecessary and the time for decomposing fats and oils can be shortened, and have completed the present invention.
【０００５】すなわち、上記課題は以下の手段で解決さ
れた。 （１）油脂含有排水を生物処理する方法において、高濃
度油脂含有排水を酸発酵処理し、該発酵処理水と油脂を
含まない有機性排水とを混合して、メタン発酵処理する
ことを特徴とする油脂含有排水の嫌気性処理方法。
（２）該酸発酵処理水と油脂を含まない有機性排水とを
混合した、メタン発酵 処理に流入する排水は、その有機物（ＣＯＤｃｒ）中の
油脂含有率（ＣＯＤｃｒベース）を１０％以下にするこ
とを特徴とする前記（１）記載の油脂含有排水の嫌気性
処理方法。That is, the above-mentioned problem has been solved by the following means. (1) A method of biologically treating oil-and-fat-containing wastewater, wherein the high-concentration oil-and-fat-containing wastewater is subjected to acid fermentation treatment, and the fermentation-treated water and organic wastewater containing no oil / fat are subjected to methane fermentation treatment. For anaerobic treatment of waste oil-containing wastewater.
(2) The wastewater flowing into the methane fermentation treatment, in which the acid fermentation treated water and the organic wastewater containing no fats and oils are mixed, has a fat content (CODcr base) in the organic matter (CODcr) of 10% or less. The method for anaerobic treatment of oil / fat-containing wastewater according to the above (1), characterized in that:
【０００６】[0006]
【発明の実施の形態】本発明では、高濃度油脂含有排水
を酸発酵処理し、他の油脂を含まない有機性廃水と混合
することで、メタン発酵処理を安定にすると同時に、メ
タン発酵処理で得られるガス量を増やすことができるよ
うになる。油脂は大きく分けてトリグリセライドを含む
場合、パルチミン酸、ステアリン酸等の高級脂肪酸を含
む場合に分けられる。前者の場合はリパーゼ等の酵素処
理を行い、トリグリセライドをグリセリンと高級脂肪酸
に分解し、さらに高級脂肪酸を酸発酵処理する。後者の
場合は分解処理は必要がなく、高級脂肪酸を酸発酵処理
する。高級脂肪酸の酸発酵処理は、酵素、微生物を用い
た生物学的処理、オゾン処理、酸処理、アルカリ処理等
を用いた物理化学的処理、あるいは物理学的処理を組み
合わせたもの、いずれも使用できる。排水中の油脂含有
量、油脂の種類によって前処理法の内容を選択する。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, wastewater containing high-concentration fats and oils is subjected to acid fermentation treatment and mixed with other organic wastewater containing no fats and oils, thereby stabilizing the methane fermentation treatment and, at the same time, stabilizing methane fermentation treatment. The amount of gas obtained can be increased. Fats and oils are roughly divided into those containing triglycerides and those containing higher fatty acids such as palmitic acid and stearic acid. In the former case, an enzymatic treatment such as lipase is performed to decompose triglyceride into glycerin and higher fatty acids, and then the higher fatty acids are subjected to acid fermentation. In the latter case, no decomposition treatment is required, and the higher fatty acid is subjected to acid fermentation treatment. For the acid fermentation treatment of higher fatty acids, any of biological treatment using enzymes, microorganisms, physicochemical treatment using ozone treatment, acid treatment, alkali treatment, or a combination of physical treatments can be used. . The content of the pretreatment method is selected according to the fat content in the wastewater and the type of fat.
【０００７】前処理された排水は油脂を含まない有機性
排水と混合され、嫌気性処理される。嫌気性処理は上向
流嫌気性汚泥床法（ＵＡＳＢ法）、固定床法、流動床
法、浮遊嫌気性処理法等いずれのものも使用できる。こ
こで重要なことは、高濃度油脂含有排水を酸発酵処理
し、他の油脂を含まない排水と混合した後、メタン発酵
処理することである。酸発酵処理前の高濃度油脂含有排
水と他の油脂を含まない排水をそのまま混合してメタン
発酵処理した場合は、メタン発酵槽で油脂分解過程が律
速段階となり、メタン発酵処理が不安定になる。仮にメ
タン発酵処理の前段で酸発酵処理を行っていても、油脂
と他の炭水化物、蛋白質等を同時に酸発酵すると油脂分
解の効率低下を招き、また油脂濃度が低いため酸発酵処
理の効率低下となる。[0007] The pretreated wastewater is mixed with an oil-free organic wastewater and subjected to anaerobic treatment. As the anaerobic treatment, any of an upward anaerobic sludge bed method (UASB method), a fixed bed method, a fluidized bed method, and a floating anaerobic treatment method can be used. What is important here is that the wastewater containing high-concentration fats and oils is subjected to acid fermentation treatment, mixed with other wastewater containing no fats and oils, and then subjected to methane fermentation treatment. If methane fermentation treatment is performed by directly mixing wastewater containing high-concentration oils and fats before acid fermentation and wastewater that does not contain other oils and fats, the fat and oil decomposition process becomes the rate-determining stage in the methane fermentation tank, and the methane fermentation treatment becomes unstable . Even if the acid fermentation treatment is performed before the methane fermentation treatment, the acid fermentation of fats and oils and other carbohydrates, proteins, etc. at the same time causes a decrease in the efficiency of fat and oil decomposition, and the low concentration of the fats and oils leads to a decrease in the efficiency of the acid fermentation treatment. Become.
【０００８】さらに重要な因子は、高濃度油脂含有排水
の前処理排水と油脂を含まない有機性排水を混合した後
の排水に含まれる有機物中の油脂の割合である。前処理
で１００％油脂を酸発酵処理できないため、メタン発酵
処理で油脂分解を行う必要がある。一般的に、高級脂肪
酸の微生物による分解はβ−酸化により行われるが、分
解速度が遅いため、メタン発酵槽でのメタン菌と油脂分
解の微生物のバランスが重要となる。ここで排水中の有
機物をＣＯＤｃｒで表示し、脂質成分は脂質をクロロホ
ルムに抽出されたもののＣＯＤｃｒ換算した。その結
果、排水中のＣＯＤｃｒの１０％以内に脂質由来のＣＯ
Ｄｃｒ成分を押さえることが必要なことが分かった。An even more important factor is the proportion of fats and oils in the organic matter contained in the wastewater after mixing the pretreatment wastewater containing the high-concentration fats and oils with the organic wastewater containing no fats and oils. Since 100% fats and oils cannot be subjected to acid fermentation treatment by pretreatment, fats and oils must be decomposed by methane fermentation treatment. Generally, higher fatty acids are decomposed by microorganisms by β-oxidation. However, since the decomposition rate is slow, the balance between methane bacteria and oil-decomposing microorganisms in a methane fermentation tank is important. Here, the organic matter in the wastewater is indicated by CODcr, and the lipid component is obtained by extracting the lipid into chloroform and converting it to CODcr. As a result, within 10% of CODcr in the wastewater, lipid-derived CO
It was found that it was necessary to suppress the Dcr component.
【０００９】図面を用いて本発明をより具体的に説明す
ると、図１は本発明の処理方法のフローシートを示すも
ので、高濃度油脂含有排水１は、前処理として酸醗酵処
理槽２で酸醗酵処理され、そこからの酸醗酵処理水３は
油脂を含まない有機性排水４と混合されて混合排水５と
なり、次にメタン醗酵槽６に入って前記したようにメタ
ン発酵処理される。そこで、高級脂肪酸の微生物による
分解の他、油脂分解も行われ、油脂分が少なく、全体と
して有機成分の少ない処理水７を得ることができる。混
合排水５の形成は前記したようにするのが好ましい。The present invention will be described more specifically with reference to the drawings. FIG. 1 shows a flow sheet of the treatment method of the present invention. The acid fermentation treatment is performed, and the acid fermentation treatment water 3 therefrom is mixed with an organic wastewater 4 containing no fat and oil to form a mixed wastewater 5, and then enters a methane fermentation tank 6 where the methane fermentation is performed as described above. Therefore, in addition to decomposition of higher fatty acids by microorganisms, decomposition of fats and oils is also carried out, so that treated water 7 containing less fats and oils and having less organic components as a whole can be obtained. The formation of the mixed wastewater 5 is preferably performed as described above.
【００１０】[0010]
【実施例】以下、本発明を実施例により具体的に説明す
るが、本発明はこれら実施例によって限定されるもので
ない。EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples.
【００１１】実施例１ （有機排水の水質）油脂を含んだ食品工場の有機排水に
ついて、高濃度油脂排水を分離しない場合と分離して前
処理を行った後に油脂を含まない排水と混合した場合の
排水性状を第１表に示す。Example 1 (Water quality of organic wastewater) Regarding organic wastewater containing fats and oils, a case where high-concentration fats and oils wastewater is not separated and a case where it is mixed with wastewater containing no fats and oils after separating and pretreating. Table 1 shows the drainage properties.
【００１２】[0012]
【表１】 [Table 1]
【００１３】注）＊１：「酸醗酵処理前」は、本発明の
処理に導入されてきた排水をいう。 ＊２：油脂由来のＣＯＤｃｒはクロロホルムで抽出され
た油脂をＣＯＤｃｒ測定したものを示す。 （処理工程）ここでの油脂はオレイン酸等の高級脂肪酸
主体であるため、酸発酵処理は固定床リアクタに酸生成
菌を固定化して酸発酵処理を行った。メタン発酵処理は
ＵＡＳＢ処理で行った。反応槽の温度は酸発酵処理、メ
タン発酵処理共に３５℃である。Note: * 1: "Before acid fermentation" refers to wastewater introduced into the treatment of the present invention. * 2: CODcr derived from fats and oils is the result of CODcr measurement of fats and oils extracted with chloroform. (Treatment step) Since the fats and oils here are mainly composed of higher fatty acids such as oleic acid, the acid fermentation treatment was carried out by immobilizing acid-producing bacteria in a fixed-bed reactor. The methane fermentation treatment was performed by UASB treatment. The temperature of the reaction tank is 35 ° C. for both the acid fermentation treatment and the methane fermentation treatment.
【００１４】（処理結果）第２表に実験結果を示す。従
来法では、ＵＡＳＢのＣＯＤｃｒ容積負荷７．５ｋｇ／
ｍ3 ／ｄでＣＯＤｃｒ除去率７０％に対し、本発明の方
法では、ＵＡＳＢのＣＯＤｃｒ容積負荷１５ｋｇ／ｍ3
／ｄでＣＯＤｃｒ除去率９０％であった。このように、
本発明の方法では従来法の２倍のＣＯＤｃｒ容積負荷が
とれると同時にＣＯＤｃｒ除去率も高くなった。(Processing results) Table 2 shows the experimental results. In the conventional method, the UASB CODcr volume load of 7.5 kg /
In contrast to a CODcr removal rate of 70% at m 3 / d, the method of the present invention provides a UASB with a CODcr volume load of 15 kg / m 3.
/ D was a CODcr removal rate of 90%. in this way,
In the method of the present invention, the CODcr volume load was twice that of the conventional method, and the CODcr removal rate was also increased.
【００１５】[0015]
【表２】 [Table 2]
【００１６】[0016]
【発明の効果】本発明によれば、油脂含有有機性廃水を
前処理することによりメタン醗酵におけガス回収率を高
めることができ、安定したメタン醗酵処理を行うことが
できる。また、ＣＯＤ分解率を上げることができ、全体
として処理効率を上げることができた。従来方法のよう
に別に油処理をする必要がなく、排出される油を別に処
理する必要がない。According to the present invention, the gas recovery rate in methane fermentation can be increased by pretreating the organic wastewater containing fats and oils, and a stable methane fermentation treatment can be performed. Further, the COD decomposition rate could be increased, and the processing efficiency as a whole could be increased. There is no need to separately treat oil as in the conventional method, and there is no need to separately treat discharged oil.
【図１】本発明の処理方法のフローシートを示す。FIG. 1 shows a flow sheet of the processing method of the present invention.
【図２】従来の油脂含有有機性排水の生物処理方法のフ
ローシートであり、ＣＡＳＥ−１とＣＡＳＥ−２の場合
を示す。FIG. 2 is a flow sheet of a conventional biological treatment method for an organic wastewater containing fats and oils, showing the case of CASE-1 and CASE-2.
【符号の説明】 １ 高濃度油脂含有排水 ２ 酸醗酵処理槽 ３ 酸醗酵処理水 ４ 油脂を含まない有機性排水 ５ 混合排水 ６ メタン醗酵処理槽 ７ 処理水 ８ 油脂分離槽 ９ 廃棄油脂 １０ 好気性処理槽 １１ 嫌気性処理槽[Description of Signs] 1 Wastewater containing high-concentration fats and oils 2 Acid fermentation treatment tank 3 Acid fermentation treatment water 4 Organic wastewater not containing fats and oils 5 Mixed wastewater 6 Methane fermentation treatment tank 7 Treated water 8 Fat separation tank 9 Waste fats and oils 10 Aerobic Treatment tank 11 Anaerobic treatment tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮 晶子 神奈川県藤沢市本藤沢４丁目２番１号 株 式会社荏原総合研究所内 (72)発明者 渡辺 昭 神奈川県藤沢市本藤沢４丁目２番１号 株 式会社荏原総合研究所内 Ｆターム(参考） 4D004 AA04 AB02 CA18 4D040 AA02 4D059 AA01 AA07 AA08 AA10 BA12 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akiko Miya 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Inside Ebara Research Institute, Ltd. (72) Inventor Akira Watanabe 4-2-2 Motofujisawa, Fujisawa-shi, Kanagawa No. 1 F-term in EBARA Research Institute, Ltd. (reference) 4D004 AA04 AB02 CA18 4D040 AA02 4D059 AA01 AA07 AA08 AA10 BA12
Claims (2)
て、高濃度油脂含有排水を酸発酵処理し、該酸発酵処理
水と油脂を含まない有機性排水とを混合して、メタン発
酵処理することを特徴とする油脂含有排水の嫌気性処理
方法。1. A method for biologically treating an oil / fat-containing wastewater, wherein the high-concentration oil / fat-containing wastewater is subjected to an acid fermentation treatment, and the acid fermentation treated water and an organic wastewater containing no fat / oil are mixed and subjected to methane fermentation treatment. An anaerobic treatment method for wastewater containing oils and fats.
排水とを混合した、メタン発酵処理に流入する排水は、
その有機物（ＣＯＤｃｒ）中の油脂含有率（ＣＯＤｃｒ
ベース）を１０％以下にすることを特徴とする請求項１
記載の油脂含有排水の嫌気性処理方法。2. The wastewater flowing into the methane fermentation treatment, which is a mixture of the acid fermentation treatment water and the organic wastewater containing no fats and oils,
Fat content in the organic matter (CODcr) (CODcr)
2. The method according to claim 1, wherein the base is 10% or less.
An anaerobic treatment method for the oil-and-fat-containing wastewater described in the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4202399A JP2000237787A (en) | 1999-02-19 | 1999-02-19 | Anaerobic treatment device of oil and fat-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4202399A JP2000237787A (en) | 1999-02-19 | 1999-02-19 | Anaerobic treatment device of oil and fat-containing waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000237787A true JP2000237787A (en) | 2000-09-05 |
Family
ID=12624580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4202399A Pending JP2000237787A (en) | 1999-02-19 | 1999-02-19 | Anaerobic treatment device of oil and fat-containing waste water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035594A1 (en) * | 2004-09-28 | 2006-04-06 | Kurita Water Industries Ltd. | Method and apparatus for biologically treating wastewater containing fats and oils |
| JP2006205087A (en) * | 2005-01-28 | 2006-08-10 | Fuji Electric Holdings Co Ltd | Methane fermentation method |
| JP2006224005A (en) * | 2005-02-18 | 2006-08-31 | Osaka Gas Co Ltd | Wastewater treatment system |
| WO2013146853A1 (en) * | 2012-03-30 | 2013-10-03 | 栗田工業株式会社 | Method for treating fat-containing wastewater |
-
1999
- 1999-02-19 JP JP4202399A patent/JP2000237787A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035594A1 (en) * | 2004-09-28 | 2006-04-06 | Kurita Water Industries Ltd. | Method and apparatus for biologically treating wastewater containing fats and oils |
| JP2006205087A (en) * | 2005-01-28 | 2006-08-10 | Fuji Electric Holdings Co Ltd | Methane fermentation method |
| JP4543947B2 (en) * | 2005-01-28 | 2010-09-15 | 富士電機ホールディングス株式会社 | Methane fermentation treatment method |
| JP2006224005A (en) * | 2005-02-18 | 2006-08-31 | Osaka Gas Co Ltd | Wastewater treatment system |
| WO2013146853A1 (en) * | 2012-03-30 | 2013-10-03 | 栗田工業株式会社 | Method for treating fat-containing wastewater |
| JP2013208559A (en) * | 2012-03-30 | 2013-10-10 | Kurita Water Ind Ltd | Method for treating oil-and-fat-containing wastewater |
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