JP2013000715A - Method of decomposing and removing scum aggregate generated on surface of sewage in sewage storage tank of building - Google Patents
Method of decomposing and removing scum aggregate generated on surface of sewage in sewage storage tank of building Download PDFInfo
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- JP2013000715A JP2013000715A JP2011137166A JP2011137166A JP2013000715A JP 2013000715 A JP2013000715 A JP 2013000715A JP 2011137166 A JP2011137166 A JP 2011137166A JP 2011137166 A JP2011137166 A JP 2011137166A JP 2013000715 A JP2013000715 A JP 2013000715A
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- 239000010865 sewage Substances 0.000 title claims abstract description 102
- 238000003860 storage Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 29
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 40
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 40
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 38
- 238000000354 decomposition reaction Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000002351 wastewater Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000004480 active ingredient Substances 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 9
- 239000010802 sludge Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 5
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000003925 fat Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007561 laser diffraction method Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- FKLRBKPRLBWRKK-UHFFFAOYSA-N magnesium;oxygen(2-);hydrate Chemical compound O.[O-2].[Mg+2] FKLRBKPRLBWRKK-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
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Abstract
Description
本発明は、ビルピットなどのビルの汚水貯留槽内の汚水表面に生成したスカム凝集体を分解除去する方法に関する。本発明はまた、ビルの汚水貯留槽内の汚水表面に生成したスカム凝集体を分解除去するのに有用なスカム凝集体の分解除去剤にも関する。 The present invention relates to a method for decomposing and removing scum aggregates generated on a sewage surface in a sewage storage tank of a building such as a bill pit. The present invention also relates to a scum aggregate decomposing / removing agent useful for decomposing and removing scum aggregates formed on the surface of sewage in a building sewage storage tank.
ビルと呼ばれる高層建築物の地下には、一般に、ビルピットと呼ばれる汚水貯留槽が設けられている。汚水貯留槽はビルの排水管に接続していて、ビル内の厨房から排出される油脂を含む雑排水やトイレから排出される屎尿などの汚水を一旦貯留し、その汚水の貯留量が一定量を超えると、槽内の汚水を汲み上げて下水管に排出させる。 A sewage storage tank called a building pit is generally provided in the basement of a high-rise building called a building. The sewage storage tank is connected to the drainage pipe of the building and temporarily stores sewage such as miscellaneous drainage containing fats and oils discharged from the kitchen in the building and manure discharged from the toilet. If it exceeds, the sewage in the tank will be pumped and discharged to the sewer.
汚水貯留槽内に貯留されている汚水にはスカムが生成し易い。スカムとは、汚水に浮かんでいる汚泥分解物である。汚水貯留槽内のスカムは、汚水貯留槽の底部に堆積した汚泥が嫌気性細菌によって分解して硫化水素と汚泥分解物とが生成し、その汚泥分解物が硫化水素と共に汚水の表面にまで浮上することによって生成する。スカムが多量に生成すると、スカムが凝集固化したスカム凝集体を形成する。汚水貯留槽内にスカム凝集体が生成すると、蠅などの害虫を大量に発生させる要因となる。また、スカム凝集体が汚水の表面全体を覆って汚水が外気と遮断されると、汚水中の溶存酸素量が少なくなって嫌気性細菌が活性化するため、汚泥の分解によって発生する硫化水素の量が増えて、汚水貯留槽周囲での異臭の原因となる。 Scum is easily generated in the sewage stored in the sewage storage tank. Scum is a sludge decomposition product floating in sewage. The scum in the sewage storage tank decomposes sludge accumulated at the bottom of the sewage storage tank by anaerobic bacteria to produce hydrogen sulfide and sludge decomposition products, and the sludge decomposition products rise to the surface of the sewage water together with hydrogen sulfide. To generate. When a large amount of scum is produced, a scum aggregate formed by agglomeration and solidification of the scum is formed. If scum aggregates are generated in the sewage storage tank, it will cause a large amount of pests such as straw. In addition, if the scum aggregate covers the entire surface of the sewage and the sewage is blocked from the outside air, the amount of dissolved oxygen in the sewage is reduced and the anaerobic bacteria are activated. The amount increases, causing a strange odor around the sewage storage tank.
特許文献１には、ビルピット内でのスカムの生成を抑制する方法として、ビルピット内に貯留される汚水中の汚泥を生物分解するために、ビルピット内の汚水中に微生物製剤を定期的に投与すると共に、ビルピット内の汚水中に空気供給装置により連続的に空気を供給して、前記汚水中の微生物製剤の微生物を活性化する方法が記載されている。 In Patent Document 1, as a method for suppressing the generation of scum in the bill pit, in order to biodegrade the sludge in the sewage stored in the bill pit, a microbial preparation is periodically administered into the sewage in the bill pit. In addition, a method is described in which air is continuously supplied to the wastewater in the building pit by an air supply device to activate microorganisms of the microorganism preparation in the wastewater.
特許文献２には、下水管内での硫化水素の発生を抑制する方法として、下水管内の排水に酸化マグネシウムや水酸化マグネシウムを添加する方法が記載されている。
特許文献３には、河川でのスカムの生成を抑制する方法として、酸化マグネシウム粉末を河川に散布する方法が記載されている。
前記特許文献１乃至３に記載されているのは、ビルピットや下水管などの排水施設あるいは河川でのスカムの生成や硫化水素の発生を抑える方法である。一方、ビルピットなどのビルの汚水貯留槽内の汚水表面に既に生成しているスカム凝集体は、定期的な清掃によって外部に取り出すのが一般的である。しかしながら、この定期的な清掃では、取り出したスカム凝集体を処理する作業が必要となる。従って、汚水貯留槽内の汚水表面に生成したスカム凝集体は、その汚水貯留槽内で分解除去することができれば望ましい。 Patent Documents 1 to 3 describe a method for suppressing generation of scum and generation of hydrogen sulfide in a drainage facility such as a building pit or a sewer pipe or a river. On the other hand, scum aggregates already generated on the sewage surface in a sewage storage tank of a building such as a building pit are generally taken out by regular cleaning. However, this regular cleaning requires an operation for processing the scum aggregates taken out. Therefore, it is desirable that the scum aggregate generated on the surface of the sewage in the sewage storage tank can be decomposed and removed in the sewage storage tank.
本発明者は、スカムの生成や硫化水素の発生の抑制に対して有効であるとされている、水酸化マグネシウム粉末や酸化マグネシウム粉末の供給によるスカム凝集体の分解除去効果を検討した。その結果、スカム凝集体が生成している汚水中に水酸化マグネシウム粉末を供給した場合にはスカム凝集体を効果的に分解除去することができるのに対して、酸化マグネシウム粉末を供給した場合には実用上満足できるレベルではスカム凝集体を分解除去することができないことを新たに見出し、本発明に到達した。
水酸化マグネシウム粉末の供給によってスカム凝集体を分解除去できる理由としては、汚水中に溶解した水酸化マグネシウムがスカム凝集体に含まれる油脂を加水分解することによって、油脂をバインダーとして凝集固化したスカム凝集体が分解し、その分解物が汚水中に沈降するためであると考えられる。一方、酸化マグネシウム粉末は水への溶解度が水酸化マグネシウム粉末と比較して低く、スカム凝集体に含まれる油脂を加水分解する能力が低いため、実用上満足できるレベルではスカム凝集体を分解除去することができないと考えられる。
The present inventor examined the effect of decomposing and removing scum aggregates by supplying magnesium hydroxide powder or magnesium oxide powder, which is said to be effective for suppressing generation of scum and generation of hydrogen sulfide. As a result, when magnesium hydroxide powder is supplied into the sewage in which scum aggregates are produced, scum aggregates can be effectively decomposed and removed, whereas when magnesium oxide powder is supplied. Has newly found that the scum aggregate cannot be decomposed and removed at a level that is practically satisfactory, and has reached the present invention.
The reason why the scum aggregate can be decomposed and removed by supplying the magnesium hydroxide powder is that the magnesium hydroxide dissolved in the sewage hydrolyzes the fats and oils contained in the scum aggregates, thereby coagulating and solidifying the fats and oils as a binder. This is probably because the aggregates decompose and the decomposition products settle in the sewage. On the other hand, magnesium oxide powder has a lower solubility in water than magnesium hydroxide powder and has a low ability to hydrolyze fats and oils contained in scum aggregates, so that scum aggregates are decomposed and removed at a level that is practically satisfactory. It is considered impossible.
従って、本発明は、ビルの排水管に接続する汚水貯留槽内に貯留されていて、表面にスカムの凝集体が生成している汚水の中に水酸化マグネシウム粉末を供給することを特徴とする、ビルの汚水貯留槽内の汚水表面に生成したスカム凝集体の分解除去方法にある。 Accordingly, the present invention is characterized in that magnesium hydroxide powder is supplied into sewage that is stored in a sewage storage tank connected to a drain pipe of a building and in which scum aggregates are formed on the surface. In the method for decomposing and removing scum aggregates formed on the surface of sewage in the sewage storage tank of the building.
上記本発明の方法の好ましい態様は、次の通りである。
（１）水酸化マグネシウム粉末を、汚水表面の面積１ｍ2当たり１０〜１０００ｇの範囲の量にて汚水中に供給する。
（２）水酸化マグネシウム粉末を、水性分散液として汚水中に供給する。
（３）水酸化マグネシウム粉末を、ビルの排水管を介して汚水中に供給する。
Preferred embodiments of the method of the present invention are as follows.
(1) Magnesium hydroxide powder is supplied into sewage in an amount in the range of 10 to 1000 g per 1 m 2 of sewage surface area.
(2) Magnesium hydroxide powder is supplied into waste water as an aqueous dispersion.
(3) Supply magnesium hydroxide powder into sewage through the drainage pipe of the building.
本発明はまた、水酸化マグネシウム粉末を有効成分として含有することを特徴とする、ビルの汚水貯留槽内の汚水表面に生成したスカム凝集体の分解除去剤にもある。 The present invention also resides in a decomposition and removal agent for scum aggregates formed on the surface of sewage in a sewage storage tank of a building, characterized by containing magnesium hydroxide powder as an active ingredient.
本発明のスカム凝集体の分解除去方法を利用することによって、ビルピットなどのビルの汚水貯留槽内の汚水表面に生成したスカム凝集体を、その汚水貯留槽内で効果的に分解除去することができる。 By utilizing the method for decomposing and removing scum aggregates according to the present invention, scum aggregates generated on the surface of sewage in a building sewage storage tank such as a building pit can be effectively decomposed and removed in the sewage storage tank. it can.
本発明のビルの汚水貯留槽内の汚水表面に生成したスカム凝集体の分解除去方法及びスカム凝集体の分解除去剤を、添付図面の図１を参照しながら説明する。
図１は、本発明の実施を想定したビルの汚水貯留槽の一例の模式的断面図である。図１において、汚水貯留槽１は、ビル内にて発生した汚水を汚水貯留槽１に送るための排水管２と、排水ポンプ３とを備えている。排水ポンプ３は、汚水貯留槽１内に貯留されている汚水４の貯留量が一定量を超えると汚水４を汲み上げて下水管に排出する。汚水貯留槽１の底部には汚泥５が堆積しており、汚水４の表面には、多数のスカム６が凝集固化して生成したスカム凝集体７が存在している。
A method for decomposing and removing scum aggregates formed on the surface of sewage in a sewage storage tank of a building of the present invention and a scum aggregate decomposing / removing agent will be described with reference to FIG. 1 of the accompanying drawings.
FIG. 1 is a schematic cross-sectional view of an example of a sewage storage tank of a building assuming the implementation of the present invention. In FIG. 1, the sewage storage tank 1 includes a
本発明において、ビルの汚水貯留槽１の例としては、ビルピット及び浄化槽を挙げることができる。ビルピットは、汚水を貯留する機能のみを有する汚水貯留槽を、浄化槽は、汚水を貯留する機能と、槽内に貯留している汚水を活性汚泥法や生物膜法などの生物学的処理法により浄化する機能とを有する汚水貯留槽を意味する。なお、浄化槽は、ビルピットと比較してスカムは生成しにくいが、一度生成したスカムは生物学的処理法によっては除去することは難しいため、浄化槽においてもスカム凝集体の分解除去が必要となる場合がある。 In the present invention, examples of the building sewage storage tank 1 include a building pit and a septic tank. The bill pit is a sewage storage tank that has only a function of storing sewage, and the septic tank is a function of storing sewage and the sewage stored in the tank by biological treatment methods such as the activated sludge method and the biofilm method. It means a sewage storage tank having a function of purifying. Septic tanks are less likely to produce scum than bill pits, but once scum is difficult to remove by biological treatment methods, it is necessary to disassemble and remove scum aggregates even in septic tanks. There is.
本発明では、表面にスカム凝集体７が生成して汚水４の中に、スカム凝集体の分解除去剤として水酸化マグネシウム粉末を供給する。分解除去剤は、水酸化ナトリウム粉末や水酸化カリウム粉末などのアルカリ金属の水酸化物を含んでいてもよい。但し、分解除去剤中の水酸化マグネシウム粉末の含有量は、好ましくは６０質量％以上、特に好ましくは８０質量％以上である。
In the present invention, scum aggregates 7 are generated on the surface, and magnesium hydroxide powder is supplied into the
本発明で使用する水酸化マグネシウム粉末は、微細な水酸化マグネシウム粒子を造粒機により造粒もしくは自然造粒したものであって、標準篩を使用した篩い分け法による平均粒子径が好ましくは０．０１〜１０ｍｍの範囲、より好ましくは０．０２〜５ｍｍの範囲、特に好ましくは０．０５〜１ｍｍの範囲にある。水酸化マグネシウム粒子のレーザー回折法による平均粒子径は、好ましくは１〜１０μｍの範囲、より好ましくは１〜５μｍの範囲にある。また、水酸化マグネシウム粉末の供給量はスカム凝集体７の生成状況によっても異なるが、汚水表面の面積１ｍ2当たりの量として、好ましくは１０〜１０００ｇの範囲の量、特に好ましくは１０〜５００ｇの範囲の量である。 The magnesium hydroxide powder used in the present invention is obtained by granulating fine magnesium hydroxide particles by a granulator or natural granulation, and the average particle diameter by a sieving method using a standard sieve is preferably 0. The range is 0.01 to 10 mm, more preferably 0.02 to 5 mm, and particularly preferably 0.05 to 1 mm. The average particle diameter of the magnesium hydroxide particles by laser diffraction method is preferably in the range of 1 to 10 μm, more preferably in the range of 1 to 5 μm. Further, the supply amount of the magnesium hydroxide powder varies depending on the production state of the scum aggregate 7, but the amount per 1 m 2 of the sewage surface area is preferably in the range of 10 to 1000 g, particularly preferably 10 to 500 g. The amount of the range.
水酸化マグネシウム粉末は水性媒体に分散させた水性分散液の状態で、すなわち水酸化マグネシウムスラリーとして汚水４の中に供給することが好ましい。水酸化マグネシウムスラリーは水酸化マグネシウム粉末と水とを混合する方法、あるいは酸化マグネシウム粉末と水とを混合して、酸化マグネシウムを水和させる方法により調製することができる。水酸化マグネシウムスラリーは排水管２に接続しているビル内の排水口に投入して、排水管２を介して汚水４の中に供給することができる。
The magnesium hydroxide powder is preferably supplied into the
水酸化マグネシウム粉末を汚水４の中に供給にすると、汚水表面のスカム凝集体７は分解し、その分解物が汚水４の中に沈降することによって、スカム凝集体が消失する。スカム凝集体の分解物は、排水ポンプ３によって、汚水と共に下水管に排出させることができる。
When the magnesium hydroxide powder is supplied into the
本発明の方法によってスカム凝集体を分解除去した後には、スカム凝集体の生成を防止するため、汚水貯留槽内の汚水中に水酸化マグネシウム粉末を定期的に供給することが好ましい。スカム凝集体の生成を防止するための水酸化マグネシウム粉末の供給量は、汚水貯留槽の容量や汚水の貯留量などの条件によっても異なるが、汚水表面の面積１ｍ2での一週間当たりの量として、一般に１０〜５０００ｇの範囲の量、好ましくは５０〜３０００ｇの範囲の量である。水酸化マグネシウム粉末の供給頻度は、一週間に１回乃至２回とすることが好ましい。 After the scum aggregates are decomposed and removed by the method of the present invention, it is preferable to periodically supply magnesium hydroxide powder into the sewage in the sewage storage tank in order to prevent the formation of scum aggregates. The amount of magnesium hydroxide powder supplied to prevent the formation of scum agglomerates varies depending on conditions such as the capacity of the sewage storage tank and the amount of sewage stored, but the amount per week for an area of 1 m 2 on the sewage surface As a rule, the amount is generally in the range of 10 to 5000 g, preferably in the range of 50 to 3000 g. The supply frequency of the magnesium hydroxide powder is preferably once or twice a week.
［実施例１］
汚水表面の面積が約２０ｍ2で、汚水表面の全体がスカム凝集体（厚さ：約１０ｃｍ）で覆われているビルピットを処理対象とした。このビルピット内の汚水中に、水酸化マグネシウム粉末（水酸化マグネシウム粉末の篩い分け法による平均粒子径：０．５ｍｍ、水酸化マグネシウム粒子のレーザー回折法による平均粒子径：４μｍ）が分散している濃度１０質量％の水酸化マグネシウムスラリー１０ｋｇを注入した。なお、水酸化マグネシウムスラリーは、ビルピットに接続している排水口に投入した。水酸化マグネシウムスラリーを注入してから約５分後、ビルピット内の状態を目視観察したところ、スカム凝集体が部分的に分解除去されていて、汚水の水面が部分的に見えるようになっていた。また、残存しているスカム凝集体の厚さはほぼ１ｃｍ以下であり、水酸化マグネシウムスラリー注入前よりもスカム凝集体の厚さは大幅に薄くなっていた。
[Example 1]
A bill pit in which the area of the sewage surface was about 20 m 2 and the entire sewage surface was covered with scum aggregates (thickness: about 10 cm) was used as a treatment target. Magnesium hydroxide powder (average particle size by the sieving method of magnesium hydroxide powder: 0.5 mm, average particle size by the laser diffraction method of magnesium hydroxide particle: 4 μm) is dispersed in the sewage in this building pit. 10 kg of magnesium hydroxide slurry having a concentration of 10% by mass was injected. In addition, the magnesium hydroxide slurry was thrown into the drain outlet connected to the bill pit. About 5 minutes after injecting the magnesium hydroxide slurry, the state inside the building pit was visually observed. As a result, the scum aggregate was partially decomposed and removed, and the water surface of the sewage was partially visible. . Further, the thickness of the remaining scum aggregate was approximately 1 cm or less, and the thickness of the scum aggregate was significantly thinner than before the magnesium hydroxide slurry was injected.
［比較例１］
汚水表面の面積が約２０ｍ2で、汚水表面の全体がスカム凝集体（厚さ：約１０ｃｍ）で覆われているビルピットを処理対象とした。このビルピット内の汚水中に、酸化マグネシウム粉末２ｋｇを直接投入した。酸化マグネシウム粉末を投入してから５分後、ビルピット内の状態を目視観察したところ、汚水の表面全体がスカム凝集体で覆われたままであり、汚水の水面は全く見えなかった。また、スカム凝集体の厚さは、酸化マグネシウム粉末投入前とほぼ変わらなかった。
[Comparative Example 1]
A bill pit in which the area of the sewage surface was about 20 m 2 and the entire sewage surface was covered with scum aggregates (thickness: about 10 cm) was used as a treatment target. 2 kg of magnesium oxide powder was directly charged into the sewage in the building pit. Five minutes after the magnesium oxide powder was added, the state inside the building pit was visually observed. As a result, the entire surface of the sewage remained covered with scum aggregates, and the surface of the sewage was not visible at all. Further, the thickness of the scum aggregate was almost the same as that before the magnesium oxide powder was charged.
１ 汚水貯留槽
２ 排水管
３ 排水ポンプ
４ 汚水
５ 汚泥
６ スカム
７ スカム凝集体
DESCRIPTION OF SYMBOLS 1
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| JP2015188841A (en) * | 2014-03-28 | 2015-11-02 | 宇部マテリアルズ株式会社 | Method of inhibiting malodor of grease trap |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08299949A (en) * | 1995-04-28 | 1996-11-19 | Adeka Eng Kk | Oily material recovering device |
| JP2002113476A (en) * | 2000-10-10 | 2002-04-16 | Sheru Shoji Kk | Method for treating sewage in building pit and air supply device used in this method |
| JP2005211766A (en) * | 2004-01-28 | 2005-08-11 | E System:Kk | Method and apparatus for treating fat and oil scum in wastewater containing fat and oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08299949A (en) * | 1995-04-28 | 1996-11-19 | Adeka Eng Kk | Oily material recovering device |
| JP2002113476A (en) * | 2000-10-10 | 2002-04-16 | Sheru Shoji Kk | Method for treating sewage in building pit and air supply device used in this method |
| JP2005211766A (en) * | 2004-01-28 | 2005-08-11 | E System:Kk | Method and apparatus for treating fat and oil scum in wastewater containing fat and oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2015188841A (en) * | 2014-03-28 | 2015-11-02 | 宇部マテリアルズ株式会社 | Method of inhibiting malodor of grease trap |
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