JP2008013638A - Method of treating oils and fats-containing waste water and its treatment apparatus - Google Patents

Method of treating oils and fats-containing waste water and its treatment apparatus Download PDF

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JP2008013638A
JP2008013638A JP2006185192A JP2006185192A JP2008013638A JP 2008013638 A JP2008013638 A JP 2008013638A JP 2006185192 A JP2006185192 A JP 2006185192A JP 2006185192 A JP2006185192 A JP 2006185192A JP 2008013638 A JP2008013638 A JP 2008013638A
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oil
fat
waste
solidifying agent
fats
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Toshiyuki Hashimoto
寿之 橋本
Kiyoko Tanaka
聖子 田中
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Hiroshima Prefecture
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/74Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of treating oils and fats-containing waste water which can separate waste oils and fats from oils and fats-containing waste water collected in a grease trap to obtain a waste oils and fats solidified substance with good handling properties by an easy recovery operation. <P>SOLUTION: The method of treating oils and fats-containing waste water comprises adding at least one oils and fats solidifying agent selected from the group consisting of stearic acid, 12-hydroxystearic acid, and paraffin to the waste oils and fats separated from the oils and fats-containing waste water collected in the grease trap 5, heating the resulting mixture at a temperature of not lower than the melting point of the oils and fats solidifying agent, then introducing the heated mixture into cooling water, and cooling and solidifying the above waste oils and fats to obtain the waste oils and fats solidified substance 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、厨房や食品工場などから出る含油脂廃水から廃油脂を分離して固化物として回収する含油脂廃水の処理方法、及びそれに用いられる処理装置に関する。   TECHNICAL FIELD The present invention relates to a method for treating oil-containing fat wastewater that separates and collects waste oil-and-fat from oil-containing fat and wastewater discharged from kitchens, food factories, and the like, and a treatment apparatus used therefor.

給食センター、ホテル、旅館、レストラン又は一般食堂などの業務用の厨房や食肉センター、食品・水産加工場などから出る廃水には、生ゴミや動植物性油脂等が多く含まれている。これらの生ゴミや動植物性油脂等がそのまま下水に流出しないようにする目的でグリーストラップを設置することが義務付けられている。   Wastewater from kitchens for commercial purposes such as lunch centers, hotels, inns, restaurants, or general restaurants, meat centers, food / fishery processing plants, and the like contains a large amount of raw garbage, animal and vegetable oils and fats, and the like. It is obliged to install a grease trap for the purpose of preventing such raw garbage, animal and vegetable oils and fats from flowing into sewage as they are.

一般的にグリーストラップでは、廃水に含まれる生ゴミ等はストレーナーで捕集され、さらに廃水はグリーストラップ内で比重差により廃油脂と水分とに分離される。また、スライド板・仕切板を設けることにより、グリーストラップ内に流入してくる廃水の速度を低下させて廃油脂と水分の分離状態を保つようにしている。   In general, in the grease trap, garbage etc. contained in the wastewater is collected by a strainer, and the wastewater is further separated into waste oil and water by the difference in specific gravity in the grease trap. In addition, by providing a slide plate / partition plate, the speed of waste water flowing into the grease trap is reduced to keep the separated state of waste oil and water.

グリーストラップに溜まった含油脂廃水を回収する方法として、例えば、定期的に清掃業者に依頼して手作業で回収する方法があるが、悪臭などにより作業環境が劣悪であるため問題があった。   As a method for collecting the oil-containing fat wastewater collected in the grease trap, for example, there is a method of periodically requesting a cleaning company and manually collecting it, but there is a problem because the working environment is poor due to bad odors and the like.

特開2001−162274号公報(特許文献1)には、回収槽の上部に浮遊する廃油を含有する混濁水を、揚水ポンプを用いて回収することのできる浮上油自動回収装置が記載されている。この浮上油自動回収装置を用いることにより、グリーストラップ内の浮上廃油を手作業で回収する操作がいらないので手間がかからないとともに、周辺の悪臭・配管詰まり等が大幅に低減できるとされている。しかしながら、回収された廃油脂はその形状により運搬する際の取り扱いが困難であり、廃棄物として処分する際にも労力がかかり問題があった。   Japanese Patent Laid-Open No. 2001-162274 (Patent Document 1) describes a floating oil automatic recovery device that can recover turbid water containing waste oil floating above the recovery tank using a pump. . By using this floating oil automatic recovery device, there is no need for manual recovery of the floating waste oil in the grease trap, so there is no need for trouble, and it is said that the bad odor and clogging of the pipes can be greatly reduced. However, the recovered waste oil and fat is difficult to handle when transported due to its shape, and there is a problem in that it takes effort when disposing it as waste.

また、特開昭55−106298号公報(特許文献2)には、12−ヒドロキシステアリン酸を廃食用油に適量添加し、加熱溶解後、冷却することを特徴とする廃食用油の固形化処理方法について記載されている。しかしながら、このような固形化処理方法は、廃食用油に12−ヒドロキシステアリン酸を直接添加する方法であり、グリーストラップに溜まった含油脂廃水のように水分が多く存在する場合に応用する例はなかった。   JP-A-55-106298 (Patent Document 2) adds a suitable amount of 12-hydroxystearic acid to waste edible oil, heat-dissolves, and then cools the solidified treatment of waste edible oil. The method is described. However, such a solidification method is a method in which 12-hydroxystearic acid is directly added to waste edible oil, and an example of application when there is a lot of water such as oil-containing fat wastewater collected in a grease trap is There wasn't.

特開2001−162274号公報JP 2001-162274 A 特開昭55−106298号公報JP 55-106298 A

本発明は上記課題を解決するためになされたものであり、グリーストラップに溜まった含油脂廃水から廃油脂を分離し、取り扱い性が良好で回収作業が容易な廃油脂固化物を得ることのできる含油脂廃水の処理方法を提供することを目的とするものである。また、そのような処理装置を提供することを目的とするものである。   The present invention has been made in order to solve the above-mentioned problems, and can separate waste oil from the oil-containing fat waste water collected in the grease trap, thereby obtaining a solidified waste oil that is easy to handle and easy to collect. It aims at providing the processing method of oil-containing fat wastewater. It is another object of the present invention to provide such a processing apparatus.

上記課題は、グリーストラップに溜まった含油脂廃水から分離した廃油脂に油脂固化剤を添加することにより前記廃油脂を固化させて廃油脂固化物を得ることを特徴とする含油脂廃水の処理方法を提供することによって解決される。   The above-mentioned problem is a method for treating oil-containing fat wastewater, wherein the oil-and-fat solidified product is obtained by solidifying the waste oil-and-fat by adding an oil-and-fat solidifying agent to waste oil and fat separated from the oil-and-fat wastewater collected in the grease trap. Solved by providing.

このとき、油脂固化剤を添加し、加熱してから冷却することが好適であり、油脂固化剤の融点以上に加熱された廃油脂を冷却水中に投入して冷却することが好適である。加熱された廃油脂の温度と冷却水の温度との差が20〜100℃の範囲にあることが好適であり、油脂固化剤が、融点が40〜100℃の範囲にある脂肪族化合物であることが好適である。また、油脂固化剤がステアリン酸、12−ヒドロキシステアリン酸及びパラフィンからなる群から選択されることが好適であり、廃油脂固化物のヘキサン抽出分が60〜100重量%の範囲にあることも好適である。   At this time, it is preferable to add an oil and fat solidifying agent and heat and then cool, and it is preferable to cool waste water and fat heated to the melting point or higher of the oil and fat solidifying agent in cooling water. It is preferable that the difference between the temperature of the heated waste oil and the temperature of the cooling water is in the range of 20 to 100 ° C, and the oil solidifying agent is an aliphatic compound having a melting point in the range of 40 to 100 ° C. Is preferred. In addition, it is preferable that the oil / fat solidifying agent is selected from the group consisting of stearic acid, 12-hydroxystearic acid and paraffin, and that the hexane extract of the waste oil / fat solidified product is in the range of 60 to 100% by weight. It is.

さらに上記課題は、グリーストラップに溜まった含油脂廃水から廃油脂を分離する分離手段と、前記廃油脂を油脂固化剤の存在下に該油脂固化剤の融点以上まで加熱する加熱手段と、加熱された廃油脂を冷却して固化させる冷却手段からなることを特徴とする含油脂廃水の処理装置を提供することによっても解決される。   Further, the above-mentioned problems include separation means for separating waste oil and fat from oil-containing fat and wastewater collected in a grease trap, heating means for heating the waste oil and fat to the melting point of the oil and fat solidifying agent in the presence of the oil and fat solidifying agent, and heating. The problem can also be solved by providing an oil-containing fat wastewater treatment apparatus comprising cooling means for cooling and solidifying the waste oil and fat.

上記含油脂廃水の処理装置において、加熱手段がヒーターと攪拌装置を備えた加熱槽であり、冷却手段が攪拌装置を備えた冷却水槽であることが好適であり、加熱槽の容量に対する冷却水槽の容量が2倍以上であることも好適である。   In the oil-containing fat wastewater treatment apparatus, the heating means is preferably a heating tank provided with a heater and a stirring device, and the cooling means is preferably a cooling water tank provided with a stirring device, and the cooling water tank with respect to the capacity of the heating tank It is also preferable that the capacity is twice or more.

本発明の含油脂廃水の処理方法によれば、グリーストラップに溜まった含油脂廃水から廃油脂を分離し、取り扱い性が良好で回収作業が容易な廃油脂固化物を得ることができる。また、得られた廃油脂固化物の含水率が低いので燃料として好適に使用することができる。   According to the method for treating oil-containing fat wastewater of the present invention, waste oil and fat can be separated from the oil-containing fat wastewater collected in the grease trap, and a solidified product of waste oil and fat that is easy to handle and easy to collect can be obtained. Moreover, since the water content of the obtained waste fat-solidified product is low, it can be suitably used as a fuel.

以下、図面を参照しながら本発明をより具体的に説明する。図1は本発明で用いられる含油脂廃水の処理装置の一例を示した断面図であり、グリーストラップに溜まった含油脂廃水から廃油脂を分離する分離手段と、前記廃油脂を脂肪族系油脂固化剤の存在下に該油脂固化剤の融点以上まで加熱する加熱手段と、加熱された廃油脂を冷却して固化させる冷却手段を備えたものである。   Hereinafter, the present invention will be described more specifically with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a processing apparatus for oil-containing fat wastewater used in the present invention. Separation means for separating waste oil and fat from oil-containing fat wastewater accumulated in a grease trap, and the waste oil and fat are converted into aliphatic oil and fat. It comprises a heating means for heating to the melting point or higher of the oil / fat solidifying agent in the presence of the solidifying agent, and a cooling means for cooling and solidifying the heated waste oil / fat.

図1に示されるように、厨房などの流し口2から流出した廃油脂を含む廃水は、廃水導入管3を通り、生ゴミ等の固形分がストレーナー4により捕集されてから、グリーストラップ5に溜められる。グリーストラップ5では、比重差により上層に油脂分が浮上し、下層の水分のみが排出管24を通って排出されるようになっている。   As shown in FIG. 1, the wastewater containing waste oil and fat flowing out from the sink 2 such as a kitchen passes through the wastewater introduction pipe 3, and solids such as garbage are collected by the strainer 4, and then the grease trap 5 Can be stored. In the grease trap 5, the oil and fat components float to the upper layer due to the difference in specific gravity, and only the lower layer moisture is discharged through the discharge pipe 24.

本発明の処理装置1における分離手段では、含油脂廃水から廃油脂が分離される。図1の例では、グリーストラップ5に溜まった含油脂廃水のうち、上層の油脂分の多い部分がポンプ等(図示せず)を用いて吸い上げられて含油脂廃水吸入管6を通って廃油脂分離槽7に送られ、廃油脂分離槽7内で比重差により廃油脂と水分とが分離する。廃油脂分離槽7内で分離した水分は廃油脂分離槽7から導出される。導出された廃水は廃水返送管19を通ってグリーストラップ5に送られてもよいし、廃水供給管17を通って冷却水槽13へ送られて冷却水として利用してもよい。廃水の導出をくり返すことによって廃油脂分離槽7内で分離・蓄積された廃油脂は加熱槽9に送られる。本発明の処理方法では、グリーストラップ5内で比重により分離された含油脂廃水に対して、このような分離手段を用いてさらに廃油脂と水分とを分離する操作を行う。この操作を行うことにより、得られる廃油脂の含水率を減らすことができる。動物性油脂などでは、室温で固体のものもあるので、分離を容易にするために廃油脂分離槽7にヒーターを設けてもよい。   In the separation means in the processing apparatus 1 of the present invention, the waste oil and fat is separated from the oil-containing fat and wastewater. In the example of FIG. 1, of the oil-containing fat waste water collected in the grease trap 5, the upper oil-rich portion is sucked up using a pump or the like (not shown) and passed through the oil-containing fat waste water suction pipe 6. It is sent to the separation tank 7, and the waste oil and fat are separated from each other by the specific gravity difference in the waste oil and fat separation tank 7. The water separated in the waste oil separation tank 7 is led out from the waste oil separation tank 7. The derived waste water may be sent to the grease trap 5 through the waste water return pipe 19, or may be sent to the cooling water tank 13 through the waste water supply pipe 17 and used as cooling water. The waste oil and fat separated and accumulated in the waste oil and fat separation tank 7 by repeating the derivation of the waste water is sent to the heating tank 9. In the treatment method of the present invention, the operation of further separating waste oil and water from the oil-containing fat waste water separated by specific gravity in the grease trap 5 using such a separation means is performed. By performing this operation, it is possible to reduce the water content of the waste oil obtained. Some animal fats and oils are solid at room temperature, so a heater may be provided in the waste oil separation tank 7 to facilitate separation.

本発明の処理方法では、含油脂廃水から分離した廃油脂に油脂固化剤を添加する操作を行う。廃油脂に油脂固化剤が混合されることにより、油脂固化剤とともに廃油脂が固化することになる。上記油脂固化剤を添加するタイミングは特に限定されず、添加してから廃油脂を攪拌してもよいし、攪拌中に添加してもよいが、廃油脂を攪拌しながら油脂固化剤を添加することが好ましい。油脂固化剤を添加する操作は手作業で行ってもよいし、一定量の油脂固化剤を自動で添加することのできる手段を備えていてもよい。油脂固化剤を添加する手段を備えていることが容易に操作できるため好ましい。   In the treatment method of the present invention, an operation of adding an oil solidifying agent to waste oil separated from oil-containing fat wastewater is performed. By mixing the fat and oil solidifying agent with the waste fat and oil, the waste fat and oil is solidified together with the fat and oil solidifying agent. The timing for adding the oil solidifying agent is not particularly limited, and the added fat or oil may be added while stirring the waste oil or fat. It is preferable. The operation of adding the oil solidifying agent may be performed manually, or a means capable of automatically adding a certain amount of oil solidifying agent may be provided. It is preferable to provide a means for adding an oil solidifying agent because it can be easily operated.

本発明で用いられる油脂固化剤は、融点が40〜100℃の範囲にある脂肪族化合物であることが好ましい。油脂固化剤の融点が40℃未満の場合、得られる廃油脂固化物15の形状安定性が良好でないおそれがあり、より好適には60℃以上である。一方、油脂固化剤の融点が100℃を超える場合、加熱・攪拌時に油脂固化剤が融解せず廃油脂との混合がうまくいかないおそれがあり、より好適には90℃以下である。好適な油脂固化剤としては、ステアリン酸、12−ヒドロキシステアリン酸、パラフィン等を例示することができる。これらのうちでもコストが低く、得られる廃油脂固化物15と水との分離性が良好であり、さらに得られる廃油脂固化物15の粒径が大きいことなどから、パラフィンがより好適である。   The oil solidifying agent used in the present invention is preferably an aliphatic compound having a melting point in the range of 40 to 100 ° C. When the melting point of the fat solidifying agent is less than 40 ° C, the shape stability of the obtained waste fat solidified product 15 may not be good, and more preferably 60 ° C or higher. On the other hand, when the melting point of the fat / oil solidifying agent exceeds 100 ° C., the fat / oil solidifying agent may not be melted during heating / stirring and mixing with the waste oil / fat may not be successful, and is preferably 90 ° C. or lower. Examples of suitable oil and fat solidifying agents include stearic acid, 12-hydroxystearic acid, paraffin and the like. Among these, the cost is low, the separability between the obtained waste oil solidified product 15 and water is good, and the particle size of the obtained waste fat solidified product 15 is large, and paraffin is more preferable.

廃油脂の水分量や油脂固化剤の種類などによっても異なるが、本発明における油脂固化剤の添加量は、廃油脂100重量部に対して1〜30重量部であることが好ましい。油脂固化剤の添加量が1重量部未満の場合、得られる廃油脂固化物15の形状安定性が損なわれるおそれがあり、より好適には3重量部以上である。一方、油脂固化剤の添加量が30重量部を超える場合、処理コストが増加することとなり、より好適には20重量部以下である。   Although it varies depending on the moisture content of the waste oil and fat and the kind of the fat and oil solidifying agent, the addition amount of the fat and oil solidifying agent in the present invention is preferably 1 to 30 parts by weight per 100 parts by weight of the waste oil and fat. When the addition amount of the fat / oil solidifying agent is less than 1 part by weight, the shape stability of the obtained waste oil / fat solidified product 15 may be impaired, and more preferably 3 parts by weight or more. On the other hand, when the addition amount of the fat and oil solidifying agent exceeds 30 parts by weight, the processing cost increases, and it is more preferably 20 parts by weight or less.

本発明の処理装置1における加熱手段では、廃油脂を油脂固化剤の存在下に該油脂固化剤の融点以上まで加熱する。上記廃油脂分離槽7で分離された廃油脂を加熱槽9に導入し、油脂固化剤の存在下に該油脂固化剤の融点以上まで加熱する。加熱槽9はヒーター11と攪拌装置10を備えていることが好ましく、このことにより加熱槽9内で油脂固化剤が偏らないように廃油脂を加熱・攪拌することができる。また、廃油脂を加熱・攪拌することによって、油脂分と水分とを十分に分離することができるので、ヘキサン抽出分の高い廃油脂固化物を得ることができる。   In the heating means in the processing apparatus 1 of the present invention, the waste oil and fat is heated to the melting point or higher of the oil and fat solidifying agent in the presence of the oil and fat solidifying agent. Waste oil and fat separated in the waste oil and fat separation tank 7 is introduced into a heating tank 9 and heated to the melting point or higher of the fat and oil solidifying agent in the presence of the oil and fat solidifying agent. It is preferable that the heating tank 9 includes a heater 11 and a stirring device 10, whereby waste oil and fat can be heated and stirred so that the oil and fat solidifying agent is not biased in the heating tank 9. In addition, by heating and stirring the waste oil and fat, the oil and fat content and moisture can be sufficiently separated, so that a waste oil and fat solidified product having a high hexane extract can be obtained.

本発明の処理方法では、廃油脂に油脂固化剤を添加した後に加熱してから冷却することが好ましい。冷却されることにより廃油脂が固化して廃油脂固化物15が得られる。本発明の処理装置1における冷却手段は、加熱された廃油脂を冷却して固化させるものであり、図1の例では、冷却水が満たされた冷却水槽13が用いられている。油脂固化剤の融点以上に加熱された廃油脂を冷却水槽13内の冷却水中に投入して冷却することが好ましく、このことにより効率良く固化させることができる。上記冷却手段は攪拌装置14を備えていることが好ましく、このことにより均一に冷却できるとともに廃油脂固化物15の形状のバラツキを低減させることができる。   In the treatment method of the present invention, it is preferable to cool after heating after adding an oil solidifying agent to waste oil. By being cooled, the waste oil / fat is solidified to obtain a solidified product 15 of the waste oil / fat. The cooling means in the treatment apparatus 1 of the present invention cools and solidifies the heated waste oil and fat, and in the example of FIG. 1, a cooling water tank 13 filled with cooling water is used. It is preferable to cool waste oil and fat heated to the melting point or higher of the oil and fat solidifying agent into the cooling water in the cooling water tank 13 for cooling. The cooling means is preferably provided with a stirring device 14, which can cool uniformly and reduce variations in the shape of the waste oil solidified product 15.

冷却する際に用いる冷却水の温度は特に限定されないが、加熱槽9により加熱された廃油脂の温度と冷却水槽13内の冷却水の温度との差が20〜100℃の範囲にあることが好ましい。温度差が20℃未満の場合、迅速に廃油脂を固化できないおそれがあるとともに、得られた廃油脂固化物15の形状のバラツキが大きくなるおそれがあり、より好適には30℃以上である。一方、温度差は通常100℃以下であるが、コストや安全性の観点からは、より好適には90℃以下である。   Although the temperature of the cooling water used when cooling is not particularly limited, the difference between the temperature of the waste oil heated by the heating tank 9 and the temperature of the cooling water in the cooling water tank 13 may be in the range of 20 to 100 ° C. preferable. When the temperature difference is less than 20 ° C., the waste oil / fat may not be rapidly solidified, and the variation of the shape of the obtained waste oil / fat solidified product 15 may increase, and is more preferably 30 ° C. or more. On the other hand, the temperature difference is usually 100 ° C. or less, but more preferably 90 ° C. or less from the viewpoint of cost and safety.

廃油脂の温度と冷却水の温度との差を上述にあるような温度範囲にするためには、加熱槽9の容量に対する冷却水槽13の容量が2倍以上であることが好ましい。冷却水槽13の容量が2倍未満の場合、冷却水の温度が上昇し、迅速に廃油脂を固化できないおそれがあるとともに、得られた廃油脂固化物15の形状のバラツキが大きくなるおそれがあり、より好適には5倍以上である。また、通常、冷却槽の容量は100倍以下である。   In order to make the difference between the temperature of the waste oil and the temperature of the cooling water within the above-described temperature range, the capacity of the cooling water tank 13 with respect to the capacity of the heating tank 9 is preferably twice or more. When the capacity of the cooling water tank 13 is less than twice, the temperature of the cooling water rises, and there is a possibility that the waste oil / fat cannot be quickly solidified, and the variation in the shape of the obtained waste oil / fat solidified product 15 may be increased. More preferably, it is 5 times or more. Moreover, the capacity | capacitance of a cooling tank is 100 times or less normally.

冷却水槽13に冷却水を供給する方法は特に限定されず、連続的に供給してもよいし、冷却水槽13内の冷却水の温度が上昇したり、汚濁負荷が高くなるたびごとに供給してもよい。冷却水としては、冷却水貯蔵槽21から冷却水供給管23により冷却水20を供給してもよいし、水道水を直接供給してもよい。廃油脂分離槽7内で分離した水分を廃水供給管17より供給してもよい。また、グリーストラップ5内の下層にある水分を揚水して供給してもよい。   The method of supplying the cooling water to the cooling water tank 13 is not particularly limited, and may be supplied continuously or whenever the temperature of the cooling water in the cooling water tank 13 rises or the pollution load increases. May be. As the cooling water, the cooling water 20 may be supplied from the cooling water storage tank 21 through the cooling water supply pipe 23, or tap water may be directly supplied. The water separated in the waste oil separation tank 7 may be supplied from the waste water supply pipe 17. Further, the water in the lower layer in the grease trap 5 may be pumped and supplied.

上述の方法により得られた廃油脂固化物15を回収する方法は特に限定されず、網などを用いて手作業で回収してもよいし、粗濾過することにより回収してもよい。また、ベルトコンベア等を備えた自動回収装置を用いて廃油脂固化物15を回収してもよい。廃油脂固化物15の回収後に残った冷却水槽13中の冷却水は、そのまま再利用してもよいし、グリーストラップ5に排出してもよい。   The method for recovering the waste oil solidified product 15 obtained by the above-described method is not particularly limited, and may be recovered manually using a net or may be recovered by coarse filtration. Moreover, you may collect | recover the waste oil-fat solidified material 15 using the automatic collection | recovery apparatus provided with the belt conveyor. The cooling water in the cooling water tank 13 remaining after the recovery of the waste oil solidified material 15 may be reused as it is or may be discharged to the grease trap 5.

また、本発明の処理装置1は、回収された廃油脂固化物15を脱水する脱水手段を備えていることが好ましい。脱水して廃油脂固化物15の含水率を減らすことにより、燃料として好適に使用することができる。脱水により生じた水分は、そのまま排出してもよいし、グリーストラップ5へ送ってもよい。脱水する方法は特に限定されず、網等を用いて水切りしてもよいし、乾燥機等で乾燥してもよい。   Moreover, it is preferable that the processing apparatus 1 of this invention is equipped with the spin-drying | dehydration means which spin-dry | dehydrates the collect | recovered waste fat and oil solids 15. By dehydrating and reducing the water content of the waste oil solidified product 15, it can be suitably used as a fuel. The water generated by the dehydration may be discharged as it is or may be sent to the grease trap 5. The method of dehydrating is not particularly limited, and may be drained using a net or the like, or may be dried with a dryer or the like.

グリーストラップ5内の下層にある廃水は、排出管24より排出される。本発明の処理方法により含油脂廃水が廃油脂固化物15として回収されるので、排出管24から廃油脂が流出することなく環境負荷を低減させることができる。   The waste water in the lower layer in the grease trap 5 is discharged from the discharge pipe 24. Since the oil-containing fat wastewater is recovered as the waste oil solidified product 15 by the treatment method of the present invention, the environmental burden can be reduced without the waste oil or fat flowing out from the discharge pipe 24.

本発明の処理方法により得られる廃油脂固化物15のヘキサン抽出分が60〜100重量%の範囲にあることが好ましい。ここで、廃油脂固化物15のヘキサン抽出分とは、ヘキサンを用いて抽出されるものの割合を示しており、廃油脂固化物15に含まれる油脂の割合に概ね相当する。このヘキサン抽出分が高い場合は、通常、廃油脂固化物15の含水率が低い。廃油脂固化物15のヘキサン抽出分が60重量%未満の場合、得られる廃油脂固化物15の含水率が高くなり総発熱量が低下することが多く、燃料としての性能が低下するおそれがあり、より好適には70重量%以上である。   It is preferable that the hexane extraction part of the waste oil solidified material 15 obtained by the processing method of this invention exists in the range of 60 to 100 weight%. Here, the hexane extract of the waste oil solidified product 15 indicates a ratio of what is extracted using hexane, and roughly corresponds to the ratio of the fat contained in the waste fat solidified product 15. When this hexane extract is high, the water content of the waste oil solidified product 15 is usually low. When the hexane extract of the waste oil solidified product 15 is less than 60% by weight, the water content of the obtained waste fat solidified material 15 is increased and the total calorific value is often lowered, and the performance as a fuel may be lowered. More preferably, it is 70% by weight or more.

本発明の処理方法において、含油脂廃水から分離された直後の廃油脂に比べて、廃油脂固化物15からのヘキサン抽出分が10重量%以上大きいことが好ましい。このことにより、含水率の低い廃油脂固化物15を得ることができる。ヘキサン抽出分の増加は、20重量%以上であることがより好ましく、30重量%以上であることがさらに好ましい。   In the treatment method of the present invention, it is preferable that the hexane extract from the waste oil solidified product 15 is larger by 10% by weight or more than the waste oil immediately after being separated from the oil-containing fat wastewater. Thereby, the waste oil-fat solidified product 15 having a low water content can be obtained. The increase in hexane extract is more preferably 20% by weight or more, and further preferably 30% by weight or more.

本発明の処理方法により得られた廃油脂固化物15は、含水率が低く、また、窒素、りん、硫黄及び金属元素等を含んでいない油脂固化剤を用いているため、燃焼する際に有害物質等が発生することの少ない固形燃料として好適に使用することができる。   The waste oil solidified product 15 obtained by the treatment method of the present invention has a low water content and uses an oil solidifying agent that does not contain nitrogen, phosphorus, sulfur, metal elements, and the like. It can be suitably used as a solid fuel with less generation of substances and the like.

以下、試験例を用いて本発明をさらに説明する。本試験例は、本発明の処理方法についてのモデル試験を行ったものである。   Hereinafter, the present invention will be further described using test examples. In this test example, a model test for the processing method of the present invention was performed.

試験例1
擬似廃油(植物油:ラード:水=1:1:2)20gを攪拌しながら80℃まで加熱し、油脂固化剤としてパラフィン(融点68−70℃)0.2g、0.4g、1g及び2gをそれぞれ添加した。パラフィンが混合されたこれら擬似廃油を25℃の冷却水200g中に投入し、得られた固化物の形状、及びろ紙への染み出しを観察した。得られた結果を表1にまとめて示す。
Test example 1
20 g of simulated waste oil (vegetable oil: lard: water = 1: 1: 2) is heated to 80 ° C. while stirring, and 0.2 g, 0.4 g, 1 g and 2 g of paraffin (melting point: 68-70 ° C.) are used as an oil solidifying agent. Each was added. These simulated waste oils mixed with paraffin were put into 200 g of cooling water at 25 ° C., and the shape of the obtained solidified product and the seepage of the filter paper were observed. The obtained results are summarized in Table 1.

試験例2
豚骨ラーメン販売店に設置されているグリーストラップに溜まった含油脂廃水の上層を汲み上げて廃油脂分離槽中で比重差により廃油脂を分離した。この廃油脂20gをビーカーで攪拌しながら80℃まで加熱し、パラフィン1gを添加した。パラフィンが混合された廃油脂を25℃の攪拌している冷却水200g中に投入したところ、直径約5mmの廃油脂固化物が得られた。得られた廃油脂固化物のヘキサン抽出分を測定したところ、87.2%であり、総発熱量を熱研式発熱量計により測定したところ、33300J/gであった。得られた結果を表2にまとめて示す。
Test example 2
The upper layer of the oil-impregnated waste water collected in the grease trap installed at the pork bone ramen dealer was pumped up, and the waste oil was separated by the specific gravity difference in the waste oil separation tank. 20 g of this waste oil and fat was heated to 80 ° C. with stirring in a beaker, and 1 g of paraffin was added. When the waste oil mixed with paraffin was put into 200 g of cooling water stirred at 25 ° C., a solidified waste oil with a diameter of about 5 mm was obtained. The amount of hexane extracted from the obtained waste oil solidified product was measured and found to be 87.2%, and the total calorific value was measured by a thermal laboratory calorimeter to be 33300 J / g. The obtained results are summarized in Table 2.

試験例3
パラフィンをステアリン酸に変更した以外は試験例2と同様にして廃油脂固化物を得た。得られた結果を表2にまとめて示す。
Test example 3
A waste oil solidified product was obtained in the same manner as in Test Example 2 except that the paraffin was changed to stearic acid. The obtained results are summarized in Table 2.

試験例4
パラフィンを12−ヒドロキシステアリン酸に変更した以外は試験例2と同様にして廃油脂固化物を得た。得られた結果を表2にまとめて示す。
Test example 4
Waste oil and fat solidified product was obtained in the same manner as in Test Example 2 except that the paraffin was changed to 12-hydroxystearic acid. The obtained results are summarized in Table 2.

試験例5
油脂固化剤を用いなかったこと以外は試験例2と同様にして廃油脂固化物を得た。得られた結果を表2にまとめて示す。
Test Example 5
A waste oil solidified product was obtained in the same manner as in Test Example 2 except that the oil solidifying agent was not used. The obtained results are summarized in Table 2.

試験例6
分離された廃油脂に対して油脂固化剤を添加せず、また加熱・攪拌せずにそのまま分析した。得られた結果を表2にまとめて示す。
Test Example 6
The oil and fat solidifying agent was not added to the separated waste oil and fat, and analysis was performed without heating and stirring. The obtained results are summarized in Table 2.

Figure 2008013638
Figure 2008013638

Figure 2008013638
Figure 2008013638

表2からわかるように、油脂固化剤を用いなかった試験例5及び試験例6では得られた廃油脂固化物の形状安定性が良好ではなかった。特に加熱・攪拌をしなかった試験例6では、得られた廃油脂固化物のヘキサン抽出割合が51.5重量%であり、含水率が高いことがわかる。これに対し、廃油脂100重量部に対して油脂固化剤を5重量部用いた試験例2〜4では、得られた廃油脂固化剤の形状安定性が良好であった。また、ヘキサン抽出割合がいずれも80重量%を超えており、試験例6よりも含水率がかなり低いことがわかる。さらに、試験例6では総発熱量が28900J/gであるのに対し、試験例2〜4ではいずれも32300J/gを超えているため、石炭・コークスと同程度以上の総発熱量を示しており、燃料としての利用が可能である。   As can be seen from Table 2, the shape stability of the obtained waste oil solidified product was not good in Test Example 5 and Test Example 6 in which the oil fat solidifying agent was not used. In Test Example 6 in which heating and stirring were not performed, the hexane extraction ratio of the obtained waste oil solidified product was 51.5% by weight, indicating that the water content was high. On the other hand, in Test Examples 2 to 4 using 5 parts by weight of the fat / oil solidifying agent with respect to 100 parts by weight of the waste oil / fat, the shape stability of the obtained waste oil / fat solidifying agent was good. Moreover, all the hexane extraction ratio exceeds 80 weight%, and it turns out that the moisture content is considerably lower than Test Example 6. Furthermore, in Test Example 6, the total calorific value is 28900 J / g, whereas in Test Examples 2 to 4 both exceed 32300 J / g, indicating a total calorific value equal to or higher than that of coal / coke. It can be used as fuel.

本発明の含油脂廃水の処理装置の実施態様を示す説明図である。It is explanatory drawing which shows the embodiment of the processing apparatus of the oil containing fat wastewater of this invention.

符号の説明Explanation of symbols

1 処理装置
2 流し口
3 廃水導入管
4 ストレーナー
5 グリーストラップ
6 含油脂廃水吸入管
7 廃油脂分離槽
8 バルブ
9 加熱槽
10 攪拌装置
11 ヒーター
12 バルブ
13 冷却水槽
14 攪拌装置
15 廃油脂固化物
16 バルブ
17 廃水供給管
18 バルブ
19 廃水返送管
20 冷却水
21 冷却水貯蔵槽
22 バルブ
23 冷却水供給管
24 排出管
DESCRIPTION OF SYMBOLS 1 Processing apparatus 2 Sink 3 Waste water introduction pipe 4 Strainer 5 Grease trap 6 Oil containing fat waste water suction pipe 7 Waste oil fat separation tank 8 Valve 9 Heating tank 10 Stirring apparatus 11 Heater 12 Valve 13 Cooling water tank 14 Stirring apparatus 15 Waste oil solidified substance 16 Valve 17 Waste water supply pipe 18 Valve 19 Waste water return pipe 20 Cooling water 21 Cooling water storage tank 22 Valve 23 Cooling water supply pipe 24 Discharge pipe

Claims (10)

グリーストラップに溜まった含油脂廃水から分離した廃油脂に油脂固化剤を添加することにより前記廃油脂を固化させて廃油脂固化物を得ることを特徴とする含油脂廃水の処理方法。   A method for treating oil-containing fat wastewater, comprising solidifying the waste oil / fat by adding an oil / fat solidifying agent to waste oil / fat separated from oil-containing fat / oil wastewater collected in a grease trap. 前記油脂固化剤を添加し、加熱してから冷却する請求項1記載の含油脂廃水の処理方法。   The method for treating oil-containing fat wastewater according to claim 1, wherein the fat-solidifying agent is added, heated and then cooled. 前記油脂固化剤の融点以上に加熱された廃油脂を冷却水中に投入して冷却する請求項2記載の含油脂廃水の処理方法。   The method for treating oil-containing fat wastewater according to claim 2, wherein waste oil heated to a temperature equal to or higher than the melting point of the oil-solidifying agent is charged into cooling water and cooled. 加熱された廃油脂の温度と冷却水の温度との差が20〜100℃の範囲にある請求項3記載の含油脂廃水の処理方法。   The method for treating oil-containing fat wastewater according to claim 3, wherein the difference between the temperature of the heated waste oil and fat and the temperature of the cooling water is in the range of 20 to 100 ° C. 前記油脂固化剤が、融点が40〜100℃の範囲にある脂肪族化合物である請求項1〜4のいずれか記載の含油脂廃水の処理方法。   The method for treating oil-containing fat wastewater according to any one of claims 1 to 4, wherein the oil-solidifying agent is an aliphatic compound having a melting point in the range of 40 to 100 ° C. 前記油脂固化剤がステアリン酸、12−ヒドロキシステアリン酸及びパラフィンからなる群から選択される少なくとも1種である請求項5記載の含油脂廃水の処理方法。   6. The method for treating oil-containing fat wastewater according to claim 5, wherein the fat-solidifying agent is at least one selected from the group consisting of stearic acid, 12-hydroxystearic acid and paraffin. 前記廃油脂固化物のヘキサン抽出分が60〜100重量%の範囲にある請求項1〜6のいずれか記載の含油脂廃水の処理方法。   The method for treating oil-containing fat wastewater according to any one of claims 1 to 6, wherein the waste oil-and-fat solidified product has a hexane extract content in the range of 60 to 100% by weight. グリーストラップに溜まった含油脂廃水から廃油脂を分離する分離手段と、前記廃油脂を油脂固化剤の存在下に該油脂固化剤の融点以上まで加熱する加熱手段と、加熱された廃油脂を冷却して固化させる冷却手段からなることを特徴とする含油脂廃水の処理装置。   Separation means for separating waste oil and fat from the oil-containing fat waste water accumulated in the grease trap, heating means for heating the waste oil and fat to the melting point of the fat and oil solidifying agent in the presence of the oil and fat solidifying agent, and cooling the heated waste oil and fat An oil-containing fat wastewater treatment apparatus comprising cooling means for solidifying the oily fat. 前記加熱手段がヒーターと攪拌装置を備えた加熱槽であり、前記冷却手段が攪拌装置を備えた冷却水槽である請求項8記載の含油脂廃水の処理装置。   The apparatus for treating oil-containing fat wastewater according to claim 8, wherein the heating means is a heating tank provided with a heater and a stirring device, and the cooling means is a cooling water tank provided with a stirring device. 前記加熱槽の容量に対する前記冷却水槽の容量が2倍以上である請求項9記載の含油脂廃水の処理装置。   The apparatus for treating oil-containing fat wastewater according to claim 9, wherein the capacity of the cooling water tank is more than twice the capacity of the heating tank.
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JP2016161338A (en) * 2015-02-27 2016-09-05 株式会社荏原製作所 Waste oil solidified body manufacturing method and device
CN106675788A (en) * 2016-12-29 2017-05-17 嘉兴市绿能环保科技有限公司 Multi-point sealing heating standing separation treatment process for waste kitchen oil

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016161338A (en) * 2015-02-27 2016-09-05 株式会社荏原製作所 Waste oil solidified body manufacturing method and device
CN105779138A (en) * 2016-04-27 2016-07-20 广东工业大学 Curing agent and application thereof
CN106675788A (en) * 2016-12-29 2017-05-17 嘉兴市绿能环保科技有限公司 Multi-point sealing heating standing separation treatment process for waste kitchen oil

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