JPH072240B2 - Oil treatment method for sewage sludge - Google Patents
Oil treatment method for sewage sludgeInfo
- Publication number
- JPH072240B2 JPH072240B2 JP62069636A JP6963687A JPH072240B2 JP H072240 B2 JPH072240 B2 JP H072240B2 JP 62069636 A JP62069636 A JP 62069636A JP 6963687 A JP6963687 A JP 6963687A JP H072240 B2 JPH072240 B2 JP H072240B2
- Authority
- JP
- Japan
- Prior art keywords
- sewage sludge
- sludge
- treatment
- reaction
- metal compound
- 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.)
- Expired - Lifetime
Links
- 239000010801 sewage sludge Substances 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 238000005187 foaming Methods 0.000 claims description 21
- 150000001341 alkaline earth metal compounds Chemical class 0.000 claims description 9
- 239000010802 sludge Substances 0.000 description 19
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 14
- 239000000047 product Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 150000001339 alkali metal compounds Chemical class 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 239000008346 aqueous phase Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000007795 chemical reaction product Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 239000002518 antifoaming agent Substances 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- -1 fatty acid alkali metal salt Chemical class 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 本発明は、下水汚泥の油化処理方法に関するものであ
る。Description: TECHNICAL FIELD The present invention relates to an oil treatment method for sewage sludge.
下水処理場から排出される汚泥（下水汚泥）は、全国で
年間約5000万m3（含水率98％）という莫大な量であり、
年々増加の傾向にある。従来、このような下水汚泥の処
理に関しては、その80％前後が脱水後、埋立処分されて
いるが、しかし、この場合には埋立地確保の問題があ
り、都市化の発展により、この埋立地確保は年々困難に
なってきている。また、下水汚泥は焼却処理することも
可能であり、この方法は、その処理生成物が被処理原料
である下水汚泥の量に比して著しく減容化された焼却灰
であり、被処理原料の減容化という点からは非常に有効
な方法である。しかしながら、この方法の場合、下水汚
泥中の水分の蒸発に多大の熱エネルギーを要するため
に、ランニングコストが高く、経済的でないという問題
を有している。このような現状に対し、本発明者らは、
特願昭60−279679号において、下水汚泥の液化処理方法
を提案している。この方法は、下水汚泥中の有機物をア
ルカリ性条件下、高められた温度において、該温度の飽
和水蒸気圧以上の加圧下で加熱反応処理した後、得られ
た反応処理生成物を冷却処理するというものである。し
かしながら、この方法は、触媒としてアルカリ金属化合
物を使用していることから、生汚泥、例えば、初汚生汚
泥や混合生汚泥に対して、油化反応中に発泡現象が観察
された。このような発泡現象は、油化処理物の分離性を
悪化させるばかりではなく、ガスラインに侵入して、圧
力制御性を著しく阻害するので、実用上、大変な問題で
ある。The amount of sludge discharged from sewage treatment plants (sewage sludge) is about 50 million m 3 (water content 98%) nationwide, which is a huge amount.
It is increasing every year. Conventionally, about 80% of such sewage sludge has been dehydrated and then landfilled, but in this case there is a problem of securing landfills, and due to the development of urbanization, this landfill Securing has become difficult every year. In addition, sewage sludge can also be incinerated, and this method is an incineration ash whose treated product is significantly reduced in volume compared to the amount of sewage sludge that is the raw material to be treated. It is a very effective method in terms of volume reduction. However, in the case of this method, a large amount of heat energy is required to evaporate the water in the sewage sludge, so that there is a problem that the running cost is high and it is not economical. With respect to such a current situation, the present inventors have
Japanese Patent Application No. 60-279679 proposes a liquefaction treatment method for sewage sludge. In this method, the organic matter in the sewage sludge is subjected to a heat reaction treatment under alkaline conditions at an elevated temperature under a pressure higher than the saturated steam pressure of the temperature, and then the obtained reaction treatment product is subjected to a cooling treatment. Is. However, in this method, since an alkali metal compound is used as a catalyst, a foaming phenomenon was observed during the oilification reaction for raw sludge, for example, primary sludge and mixed raw sludge. Such a foaming phenomenon not only deteriorates the separability of the oil-treated product, but also penetrates into the gas line to significantly impair the pressure controllability, which is a serious problem in practical use.
本発明は、前記下水汚泥の油化処理に見られる油化処理
物の発泡の問題を解決することを目的とする。An object of the present invention is to solve the problem of foaming of an oil-treated product which is found in the oil treatment of sewage sludge.
本発明によれば、発泡性下水汚泥を油化処理するに際
し、処理中の発泡を抑制するに十分な量のアルカリ土類
金属化合物を添加した後、反応温度150〜350℃、その反
応温度における飽和水蒸気圧以上の条件下で該発泡性下
水汚泥を油化させることを特徴とする下水汚泥の油化処
理方法が提供される。According to the present invention, in the oil treatment of the foamable sewage sludge, after adding an alkaline earth metal compound in an amount sufficient to suppress foaming during the treatment, the reaction temperature is 150 to 350 ° C., at that reaction temperature. There is provided a method for oil treatment of sewage sludge, which comprises oiling the foamable sewage sludge under conditions of saturated steam pressure or higher.
本発明において被処理原料として用いる発泡性下水汚泥
としては、通常の下水処理場から排出される各種の汚泥
があり、このようなものには、例えば、最初沈殿池汚泥
や、余剰汚泥及びそれらの混合汚泥等が包含される。Examples of the foamable sewage sludge used as a raw material to be treated in the present invention include various sludges discharged from an ordinary sewage treatment plant, and such sludges include, for example, first settling tank sludge and excess sludge and those sludges. Mixed sludge and the like are included.
なお、本発明で言う発泡性下水汚泥とは、前記の下水汚
泥のうち、乾燥有機物基準で、脂肪分を少なくとも８重
量％含むもので、この下水汚泥に対し、炭酸ナトリウム
などのアルカリ金属化合物を外部から触媒として添加
し、または添加しないで、150〜350℃で油化処理を行う
ときに、反応温度が150℃をこえると、油化処理中の反
応物から泡が生じ、これが飛散する発泡現象を示す下水
汚泥を意味するものである。The foamable sewage sludge referred to in the present invention is one of the above sewage sludge containing at least 8% by weight of fat, based on the dry organic matter, and an alkali metal compound such as sodium carbonate is added to the sewage sludge. When oiling treatment is carried out at 150-350 ° C with or without external catalyst addition, if the reaction temperature exceeds 150 ° C, bubbles will be generated from the reaction product during the oilification treatment, and this will scatter. It means sewage sludge that shows a phenomenon.
下水汚泥の油化処理は、下水汚泥をそのまま又はアルカ
リ金属化合物を添加して高温高圧下に保持することによ
り行われる。ところが、本発明者らの研究によれば、特
定の下水汚泥を油化処理する場合、油化反応中に発泡現
象が観察された。この現象は、汚泥中に多く含まれてい
る脂肪分と汚泥中に含まれるアルカリ金属化合物又は外
部から加えたアルカリ金属化合物との間で脂肪酸のアル
カリ金属塩、すなわち、石鹸が形成されたためと考えら
れる。発泡現象は、油化反応生成物の分離性を悪化させ
るばかりでなく、ガスラインに侵入し、圧力制御性を著
しく阻害するので、実用上、大変な問題である。このよ
うな現象を防止するために、本発明では、発泡防止剤と
して、酸化カルシウム、水酸化カルシウム、炭酸カルシ
ウム、炭酸マグネシウム等のアルカリ土類金属化合物を
添加する。これは、アルカリ土類金属化合物の添加によ
り、汚泥中の脂肪分と非発泡性の金属石鹸を形成させる
ものである。この場合、アルカリ土類金属化合物の使用
量は、下水汚泥の発泡を抑制するに十分な量であればよ
く、一般には、下水汚泥１重量部（乾燥固形物基準）に
対して、通常、0.01〜0.5重量部の割合である。The oil treatment of the sewage sludge is performed by keeping the sewage sludge as it is or by adding an alkali metal compound under high temperature and high pressure. However, according to the studies by the present inventors, when the specific sewage sludge is subjected to the oil treatment, a foaming phenomenon was observed during the oilification reaction. This phenomenon is considered to be due to the formation of a fatty acid alkali metal salt, that is, soap, between the fat content contained in the sludge and the alkali metal compound contained in the sludge or the alkali metal compound added from the outside. To be The foaming phenomenon not only deteriorates the separability of the oilification reaction product, but also penetrates into the gas line and significantly impairs the pressure controllability, which is a serious problem in practical use. In order to prevent such a phenomenon, in the present invention, an alkaline earth metal compound such as calcium oxide, calcium hydroxide, calcium carbonate or magnesium carbonate is added as an antifoaming agent. This is to form a non-foaming metal soap with the fat content in the sludge by adding the alkaline earth metal compound. In this case, the amount of the alkaline earth metal compound used may be an amount sufficient to suppress foaming of the sewage sludge, and generally 0.01 part with respect to 1 part by weight of the sewage sludge (on a dry solid basis). ~ 0.5 parts by weight.
なお、本発明においては、アルカリ土類金属化合物は、
あくまでも油化処理物の発泡防止剤として添加されるも
ので、油化処理効率を向上させる触媒として添加される
ものではない。In the present invention, the alkaline earth metal compound is
It is added only as an antifoaming agent for the oil-treated product, and is not added as a catalyst for improving the oil-treatment efficiency.
即ち、本発明においては、その発泡性下水汚泥の油化処
理は、既にアルカリ金属化合物を含み、外部からのアル
カリ金属化合物を添加しなくても十分高効率で油化反応
が進行し、アルカリ土類金属化合物を添加しても、その
油化処理効率に格別の向上が見られない発泡性下水汚泥
や、発泡性汚泥に外部からアルカリ金属化合物を加えた
ことにより、十分に高効率や油化反応が進行し、アルカ
リ土類金属を添加しても、その油化処理効率に格別の向
上が見られない発泡性下水汚泥を対象とするもので、ア
ルカリ土類金属化合物によって油化処理効率が著しく向
上するような発泡性下水汚泥を対象とするものではな
い。本発明では、油化処理効率の向上の点からは、アル
カリ土類金属化合物の添加の必然性の全くない発泡性下
水汚泥に対し、アルカリ土類金属化合物を添加すること
により、従来の油化処理物に見られた発泡問題を解決し
たものである。That is, in the present invention, the oiling treatment of the foamable sewage sludge has already contained an alkali metal compound, and the oilification reaction proceeds with sufficiently high efficiency without adding an alkali metal compound from the outside, and alkaline earth Even if a metal compound is added, there is no particular improvement in the oilification treatment efficiency. By adding an alkali metal compound from the outside to the foaming sewage sludge or foaming sludge, it is possible to obtain sufficiently high efficiency and oil conversion. This is intended for effervescent sewage sludge in which the reaction progresses and even if alkaline earth metal is added, there is no particular improvement in the oilification treatment efficiency. It is not intended for the foamable sewage sludge that is significantly improved. In the present invention, from the viewpoint of improving the oilification treatment efficiency, by adding an alkaline earth metal compound to the foamable sewage sludge that does not necessarily require the addition of an alkaline earth metal compound, a conventional oilification treatment is performed. It is a solution to the foaming problem found in objects.
本発明における反応処理は高温高圧下で実施されるが、
この場合、反応温度は150〜350℃で十分であり、反応圧
力は、その反応温度における飽和水蒸気圧以上、例え
ば、250℃の場合、50kg/cm2、300℃の場合、90kg/cm2以
上であればよい。この時、反応温度での保持時間（反応
時間）は、150〜250℃の場合、60分以上、250℃以上の
場合、60分以内であれば良いが、水相に移行する有機物
量を減らすためには、なるべく高い温度で長時間反応さ
せることが望ましい。但し、反応温度を高くすること
や、長い時間反応を行わせるということは、イニシャル
コストの増大をまねくので、反応温度は300℃以下、保
持時間は60分以下が妥当である。The reaction treatment in the present invention is carried out under high temperature and high pressure,
In this case, the reaction temperature of 150 to 350 ° C. is sufficient, and the reaction pressure is equal to or higher than the saturated vapor pressure at the reaction temperature, for example, 250 ° C. is 50 kg / cm 2 , and 300 ° C. is 90 kg / cm 2 or more. If At this time, the holding time (reaction time) at the reaction temperature is 60 minutes or more in the case of 150 to 250 ° C, and 60 minutes or less in the case of 250 ° C or more, but the amount of organic substances transferred to the water phase is reduced Therefore, it is desirable to react at a temperature as high as possible for a long time. However, since raising the reaction temperature or allowing the reaction to proceed for a long time leads to an increase in the initial cost, it is appropriate that the reaction temperature is 300 ° C. or less and the holding time is 60 minutes or less.
本発明において、圧力は、下水汚泥からの水蒸気による
自己発生圧を利用することができるが、必要に応じ、例
えば、窒素ガス、炭酸ガス、アルゴンガス等を用いて加
圧することもできる。In the present invention, as the pressure, the self-generated pressure of water vapor from the sewage sludge can be used, but if necessary, for example, nitrogen gas, carbon dioxide gas, argon gas or the like can be used for pressurization.
本発明においては、前記のようにして得られた反応処理
生成物を冷却処理するが、そこで得られた冷却処理生成
物は、相分離性の良好なもので、上部の水性相と下部の
スラリー相とに容易に分離される。この生成物の相分離
性の良いこと及び水性相の透明度の高いことは、本発明
の大きな特徴の１つである。この冷却処理生成物の分離
処理には、通常の固液分離手段が適用されるが、一般に
は、スラリー相と水性相との間の密度差を利用した分離
手段、例えば、前記静置による重力分離の他、遠心分離
等を採用することができる。In the present invention, the reaction-treated product obtained as described above is subjected to a cooling treatment. The cooling-treated product obtained there has a good phase separation property and has an upper aqueous phase and a lower slurry. Easily separated into phases. The good phase separation of this product and the high transparency of the aqueous phase are one of the major features of the present invention. A usual solid-liquid separation means is applied to the separation treatment of this cooling treatment product, but generally, a separation means utilizing the density difference between the slurry phase and the aqueous phase, for example, gravity by the stationary state. Besides separation, centrifugation or the like can be adopted.
本発明において、生成される油状物質は、下水汚泥中に
初めから含まれていた無機物等と共にスラリー相を形成
する。このスラリー相から液状の油状物質を分離回収す
るには、通常の固液分離手段が用いられるが、油状物質
の回収率を高めるためには、スクリュウプレスや加圧濾
過等の加圧を伴った固液分離処理や、遠心分離等の加重
を伴った固液分離処理に付すのがよい。この場合、必要
に応じ、温度30〜100℃程度の加熱を併用することがで
きる。In the present invention, the produced oily substance forms a slurry phase together with the inorganic substances originally contained in the sewage sludge. An ordinary solid-liquid separation means is used to separate and collect the liquid oily substance from the slurry phase, but in order to increase the recovery rate of the oily substance, it is accompanied by pressurization such as a screw press or pressure filtration. It is preferable to perform solid-liquid separation treatment or solid-liquid separation treatment with weighting such as centrifugation. In this case, if necessary, heating at a temperature of about 30 to 100 ° C can be used together.
本発明によれば、従来産業廃棄物として取り扱われてい
た下水汚泥を、液体燃料（発熱量約8000kcal/kg）とし
て有用な油状物質に交換させることができる。しかも、
この場合、油状物質の収率は、乾燥有機物基準で40〜50
％もの高い値に達する。その上、本発明では、水相に移
行する有機物の割合が少なく、かつ透明性が高いので、
下水処理場の水処理工程に与える影響も少ないと言え
る。さらに、本発明においては、油化反応中の発泡現象
を防止できるため、反応生成物の分離性の向上及び圧力
制御性の向上等が期待でき、実用上、非常に有利であ
る。この油化反応時の発泡現象並びに発泡防止方法は本
発明者らが初めて見出した意外な事実である。それ故、
本発明の下水汚泥処理方法は、技術的、経済的に非常有
利な方法であるということができる。According to the present invention, sewage sludge conventionally treated as industrial waste can be replaced with an oily substance useful as a liquid fuel (heat generation amount of about 8000 kcal / kg). Moreover,
In this case, the yield of oily substance is 40-50% based on dry organic matter.
It reaches as high as%. Moreover, in the present invention, since the proportion of organic substances that migrate to the aqueous phase is low and the transparency is high,
It can be said that the impact on the water treatment process of the sewage treatment plant is small. Further, in the present invention, since the foaming phenomenon during the oilification reaction can be prevented, improvement of the separability of the reaction product and improvement of the pressure controllability can be expected, which is very advantageous in practical use. The foaming phenomenon and the method for preventing foaming during the oilification reaction are surprising facts discovered by the present inventors for the first time. Therefore,
It can be said that the sewage sludge treatment method of the present invention is a technically and economically very advantageous method.
次に、本発明を実施例によりさらに詳細に説明する。 Next, the present invention will be described in more detail with reference to examples.
参考例１ 下水汚泥として、標準活性汚泥法の処理場から排出され
た混合生汚泥の脱水ケーキを選び、試験に用いた。この
汚泥は高分子凝集剤を添加された後、ベルトプレスにて
脱水されたものである。その代表的な性状は表−１の通
りである。Reference Example 1 As the sewage sludge, a dehydrated cake of mixed raw sludge discharged from the treatment plant of the standard activated sludge method was selected and used for the test. The sludge is dehydrated by a belt press after adding a polymer flocculant. Typical properties are shown in Table 1.
上記脱水汚泥100gに、あらかじめ炭酸ナトリウムを乾燥
固形物に対し0.05重量部添加し、内容量300mlのオート
クレーブに充填し、300℃まで加熱した。この際、圧力
はあらかじめ窒素ガスで120kg/cm2まで加圧しておき、
温度上昇に伴う圧力増加を圧力調整弁を用いて、120kg/
cm2に制御した。しかし、温度が200℃を越えるころか
ら、圧力制御性が悪くなり、一定値とならなかった。そ
の後、反応は温度が300℃に到達後ただちに100℃以下ま
で冷却し、終了させた。 To 100 g of the above dehydrated sludge, 0.05 part by weight of sodium carbonate was added in advance to the dry solid matter, and the autoclave having an inner volume of 300 ml was filled and heated to 300 ° C. At this time, the pressure is previously pressurized to 120 kg / cm 2 with nitrogen gas,
Pressure increase due to temperature rise is adjusted to 120 kg /
Controlled to cm 2 . However, when the temperature exceeded 200 ° C, the pressure controllability deteriorated and it did not become a constant value. After that, the reaction was cooled to 100 ° C. or lower immediately after the temperature reached 300 ° C. and terminated.
温度が室温まで下がってから、オートクレーブを開けた
ところ、発泡現象が観察され、その泡は一部ガスライン
にまで侵入しており、この泡が圧力制御性を著しく悪化
させていたものと考えられた。When the autoclave was opened after the temperature had dropped to room temperature, a foaming phenomenon was observed, and some of the bubbles had penetrated into the gas line, and it is probable that the bubbles significantly deteriorated the pressure controllability. It was
さらに、反応生成物を静置分離したところ、スラリー相
と水性相とがきれいに分離せず、プロダクト分離性もこ
の発泡現象により、阻害されることが明らかとなった。
しかしながら、油化反応そのものは円滑に進行し、オイ
ル収率は約40％に達した。Furthermore, when the reaction product was separated by standing, it became clear that the slurry phase and the aqueous phase were not separated cleanly, and the product separation property was also hindered by this foaming phenomenon.
However, the oilification reaction itself proceeded smoothly and the oil yield reached about 40%.
参考例２ 下水汚泥として、参考例１とは異なる複数の処理場から
汚泥脱水ケーキを採取し、試験に用いた。これらの汚泥
はすべて高分子凝集剤を添加された後、ベルトプレスに
て脱水されたものである。これらの汚泥に対し、参考例
１と同様の油化処理を行ない、表−２に示す結果を得
た。但し、反応前に炭酸ナトリウムの添加は行わなかっ
たが、この場合にも、油化反応は円滑に進行した。Reference Example 2 As sewage sludge, sludge dewatering cake was collected from a plurality of treatment plants different from Reference Example 1 and used for the test. All of these sludges were dehydrated by a belt press after adding a polymer flocculant. The sludge was subjected to the same oil treatment as in Reference Example 1 to obtain the results shown in Table-2. However, although sodium carbonate was not added before the reaction, the oilification reaction proceeded smoothly also in this case.
上表に示したごとく、汚泥中の脂肪分が、乾燥有機固形
物当たりで８％以上含まれる汚泥の場合、油化反応中に
発泡現象が観察された。 As shown in the above table, when the fat content in the sludge was 8% or more based on the dry organic solid matter, the foaming phenomenon was observed during the oilification reaction.
実施例１ 参考例２の汚泥Ｅに、あらかじめ炭酸カルシウムを乾燥
固形物に対し0.05重量部及び0.2重量部添加し、油化実
験を行った。この後の操作は参考例１と同様である。Example 1 To sludge E of Reference Example 2, 0.05 parts by weight and 0.2 parts by weight of calcium carbonate were previously added to the dry solid matter, and an oiling experiment was conducted. The subsequent operation is the same as in Reference Example 1.
その結果、0.05重量部と0.2重量部において、油状物質
の生成量は、無添加の時と比べて、特に差が認められ
ず、炭酸カルシウムは実質上触媒としての作用を何ら示
さなかった。発泡現象に関しては、0.05重量部の時は観
察されたが、0.2重量部においては、全く発泡は見られ
なかった。この結果より、炭酸カルシウム等のアルカリ
土類金属化合物を適切に添加すれば、油化反応中の発泡
現象は防止できることが明らかとなった。As a result, at 0.05 parts by weight and 0.2 parts by weight, there was no particular difference in the production amount of the oily substance as compared with the case of no addition, and calcium carbonate showed substantially no action as a catalyst. The foaming phenomenon was observed at 0.05 parts by weight, but no foaming was observed at 0.2 parts by weight. From this result, it was revealed that the foaming phenomenon during the oilification reaction can be prevented by appropriately adding an alkaline earth metal compound such as calcium carbonate.
実施例２ 参考例１において、乾燥固形物100重量に対し、炭酸ナ
トリウム0.05重量部を油化処理用触媒として、炭酸カル
シウムを0.2重量部とともに下水汚泥に添加した以外は
同様にして実験を行った。この場合には、発泡現象は観
察されなかった。また、この場合の油状物質の生成量
は、炭酸カルシウムの添加によって実質上向上せず、炭
酸カルシウムは触媒として作用せず、発泡防止剤として
のみ作用していることが確認された。Example 2 An experiment was conducted in the same manner as in Reference Example 1 except that 0.05 part by weight of sodium carbonate was used as a catalyst for oil treatment and 0.2 part by weight of calcium carbonate was added to sewage sludge with respect to 100 parts by weight of dried solid matter. . In this case, no bubbling phenomenon was observed. Further, it was confirmed that the amount of the oily substance produced in this case was not substantially improved by the addition of calcium carbonate, and calcium carbonate did not act as a catalyst but acted only as an antifoaming agent.
フロントページの続き (72)発明者 小木 知子 茨城県筑波郡谷田部町小野川16番３ 工業 技術院公害資源研究所内 (72)発明者 中村 忠 茨城県筑波郡谷田部町小野川16番３ 工業 技術院公害資源研究所内 (72)発明者 鈴木 明 茨城県筑波郡谷田部町小野川16番３ 工業 技術院公害資源研究所内 (56)参考文献 特開 昭61−238399（ＪＰ，Ａ) 特開 昭61−66789（ＪＰ，Ａ) 特開 昭61−225280（ＪＰ，Ａ) 実開 昭60−262888（ＪＰ，Ｕ)Front page continuation (72) Inventor Tomoko Ogi 16-3 Onogawa, Yatabe-cho, Tsukuba-gun, Ibaraki Institute of Pollution Resources, Institute of Industrial Technology (72) Tadashi Nakamura 16-3 Onogawa, Yatabe-cho, Tsukuba-gun, Ibaraki Pollution resources In-Lab (72) Inventor Akira Suzuki 16-3 Onogawa, Yatabe-cho, Tsukuba-gun, Ibaraki Inside Institute for Pollution Resources, Industrial Technology Institute (56) Reference JP-A-61-238399 (JP, A) JP-A-61-66789 (JP) , A) Japanese Unexamined Patent Publication No. 61-225280 (JP, A) Actually developed 60-262888 (JP, U)
Claims (1)
理中の発泡を抑制するに十分な量のアルカリ土類金属化
合物を添加した後、反応温度150〜350℃、その反応温度
における飽和水蒸気圧以上の条件下で該発泡性下水汚泥
を油化させることを特徴とする下水汚泥の油化処理方
法。1. When an expandable sewage sludge is oiled, after adding an amount of an alkaline earth metal compound sufficient to suppress foaming during the process, a reaction temperature of 150 to 350 ° C. and saturation at the reaction temperature are obtained. A method for oil treatment of sewage sludge, which comprises liquefying the foamable sewage sludge under conditions of steam pressure or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62069636A JPH072240B2 (en) | 1987-03-24 | 1987-03-24 | Oil treatment method for sewage sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62069636A JPH072240B2 (en) | 1987-03-24 | 1987-03-24 | Oil treatment method for sewage sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63235396A JPS63235396A (en) | 1988-09-30 |
| JPH072240B2 true JPH072240B2 (en) | 1995-01-18 |
Family
ID=13408548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62069636A Expired - Lifetime JPH072240B2 (en) | 1987-03-24 | 1987-03-24 | Oil treatment method for sewage sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH072240B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01270999A (en) * | 1988-04-25 | 1989-10-30 | Agency Of Ind Science & Technol | Liquefaction treatment process of sewage |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60262888A (en) * | 1984-06-08 | 1985-12-26 | Agency Of Ind Science & Technol | Liquefaction of wooden biomass |
| JPS6166789A (en) * | 1984-09-11 | 1986-04-05 | Agency Of Ind Science & Technol | Liquefaction of cellulosic biomass under supercritical conditions |
| JPS61225280A (en) * | 1985-03-30 | 1986-10-07 | Agency Of Ind Science & Technol | Liquefaction of cellulose-containing biomass |
| JPH0780000B2 (en) * | 1985-04-15 | 1995-08-30 | オルガノ株式会社 | Sludge oiling device |
-
1987
- 1987-03-24 JP JP62069636A patent/JPH072240B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63235396A (en) | 1988-09-30 |
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