JPS58112100A - Dehydration of excess sludge - Google Patents
Dehydration of excess sludgeInfo
- Publication number
- JPS58112100A JPS58112100A JP56211081A JP21108181A JPS58112100A JP S58112100 A JPS58112100 A JP S58112100A JP 56211081 A JP56211081 A JP 56211081A JP 21108181 A JP21108181 A JP 21108181A JP S58112100 A JPS58112100 A JP S58112100A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- flocculant
- added
- inorganic flocculant
- dehydrated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 34
- 230000018044 dehydration Effects 0.000 title description 6
- 238000006297 dehydration reaction Methods 0.000 title description 6
- 238000000034 method Methods 0.000 claims abstract description 17
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 6
- 238000002407 reforming Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 238000011282 treatment Methods 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical group [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 4
- 239000000920 calcium hydroxide Substances 0.000 abstract description 4
- 235000011116 calcium hydroxide Nutrition 0.000 abstract description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 4
- 235000011121 sodium hydroxide Nutrition 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 abstract 2
- 125000000129 anionic group Chemical group 0.000 abstract 1
- 239000010815 organic waste Substances 0.000 abstract 1
- 230000008719 thickening Effects 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 description 7
- 229920006318 anionic polymer Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical class [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、有機性廃水を生物処理する際に発生する余剰
汚泥の脱水方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dewatering excess sludge generated during biological treatment of organic wastewater.
有機性廃水を処理する場合、活性汚泥法あるいは窒素分
の多い廃水では脱窒素活性汚泥法などの生物処理方法が
採用されている。これらの生物処理においては余剰汚泥
が発生し、これは濃縮後脱水処理されるが、脱水に当っ
ては脱水助剤として乾燥固形物当りＦ ｅ ＣＱ ３を
３〜１５％、Ｃａ （ＯＨ） ２を１０〜３０％添加し
たり、あるいはＣａ （ＯＨ） ａの代りに高分子凝集
、剤を０．３〜α５％添加したのち脱水機によ抄脱水し
ている−のが一般であった。しかしながら、かかる従来
法においては脱水ケーキの含水率が高く、脱水ケーキ量
も多量になり、脱水機の型式にも制限があるなどの欠点
があった。When treating organic wastewater, biological treatment methods such as activated sludge method or denitrification activated sludge method are used for wastewater with a high nitrogen content. In these biological treatments, excess sludge is generated, which is concentrated and then dehydrated. During dewatering, 3 to 15% of FeCQ3 and Ca(OH)2 are used as dehydration aids per dry solid. It was common to add 10 to 30% of Ca (OH) a, or add 0.3 to 5% of a polymer flocculating agent instead of Ca (OH) a, and then perform paper dehydration using a dehydrator. However, such conventional methods have drawbacks such as a high moisture content of the dehydrated cake, a large amount of dehydrated cake, and restrictions on the type of dehydrator.
本発明は、脱水性の悪い余剰汚泥を脱水容易な性状に改
質することによって、脱水機の型式に制限を受けること
なく、脱水ケーキの含水率を大幅に低下させ、脱水ケー
キ置をも減少させることを目的とするものである。The present invention significantly reduces the water content of the dehydrated cake and reduces the need for dewatering cake by modifying surplus sludge with poor dewatering properties to make it easy to dehydrate. The purpose is to
本発明は、有機性廃水を生物処理した際に発生した余剰
汚泥を濃縮し、この濃縮汚泥に無機凝集剤を添加してｐ
Ｈ１，５〜４．０にて３分以上攪拌混合して汚泥を改質
したのち、アルカリ剤を添加して−を４〜６に調整し、
次いで高分子凝集剤を添加して脱水することを特徴とす
る本のである。The present invention concentrates surplus sludge generated when organic wastewater is biologically treated, and adds an inorganic flocculant to this thickened sludge.
After modifying the sludge by stirring and mixing at H1.5 to 4.0 for 3 minutes or more, add an alkaline agent and adjust - to 4 to 6.
This book is characterized in that a polymer flocculant is then added for dehydration.
さらに本発明の一実施態様を図面を参照しながら説明す
れば、まず原水たる有機性廃水は返送汚泥と共に活性汚
泥蛤理され、分離された余剰汚泥は濃縮工程にて濃縮さ
れる。この濃縮された余剰汚泥は、改質工程に導かれて
塩化第２鉄や硫酸アルｌニウムなどの無機凝集剤を添加
しｐｔ（１，５〜４．０、好ましくはｐＨｔｓ〜２５に
して３分以上攪拌混合する。ここでは無機凝集剤の添加
によって…は低下するが、場合によっては…が１．５〜
４．Ｏｆでに低下しない場合があるから、硫噌その他の
鉱酸を併用して−を所定範囲にまで低下させる。この改
質に要する時間は３分以上必要であって、それ以内では
改質効果は全くみられない。このような改質工程を経た
汚泥は、消石灰、苛性ソーダなどのアルカリ剤添加によ
ってｐＨ４〜６に調整し、さらにノニオン系又はアニオ
ン系の高分子凝集剤を添加して凝集させ、脱水機へ導い
て脱水する。Further, one embodiment of the present invention will be described with reference to the drawings. First, organic wastewater as raw water is subjected to activated sludge treatment together with returned sludge, and the separated excess sludge is concentrated in a concentration step. This concentrated surplus sludge is led to a reforming process where an inorganic flocculant such as ferric chloride or aluminum sulfate is added to adjust the pt (1.5 to 4.0, preferably pHts to 25) to 3. Stir and mix for at least 1 minute.Here, the addition of an inorganic flocculant lowers the..., but in some cases...
4. Since there are cases in which the value of - is not lowered within a certain range, sulfur and other mineral acids are used in combination to lower the value of - to a predetermined range. The time required for this modification is 3 minutes or more, and no modification effect is observed within that time. The sludge that has undergone such a reforming process is adjusted to pH 4 to 6 by adding an alkaline agent such as slaked lime or caustic soda, and is then coagulated by adding a nonionic or anionic polymer flocculant, and then led to a dehydrator. Dehydrate.
上記のうち気質工程は極めて重要な工程であって、従来
法においては塩化第２鉄と消石灰が同時に添加されてお
り、また塩化第２鉄のみ添加の場合でも−は４以上にお
いて凝集処理されるから、汚泥の改質は全くみられない
が、上記の如く本発明では例えば塩化第２鉄のみ添加の
場合でも…を１．５〜４．０にして３分以上攪拌混合す
ることによって汚泥は脱水容易な性状に改質されるので
ある。Among the above, the tempering process is an extremely important process, and in the conventional method, ferric chloride and slaked lime are added at the same time, and even when only ferric chloride is added, - is agglomerated at 4 or more. However, as mentioned above, in the present invention, even when only ferric chloride is added, the sludge can be improved by adjusting the... to 1.5 to 4.0 and stirring and mixing for more than 3 minutes. It is modified to make it easier to dehydrate.
したがって、脱水機には種々の型式があるが、いずれの
脱水機を用いても脱水速度は向上し、しかも脱水ケーキ
の含水率は大幅に低下し、また脱水ケーキ量も減少し、
さらに脱水ケーキの乾燥・焼却に要する燃料も大幅に剛
域することができる。Therefore, although there are various types of dehydrators, the dehydration speed improves no matter which one is used, and the moisture content of the dehydrated cake decreases significantly, and the amount of dehydrated cake also decreases.
Furthermore, the fuel required for drying and incinerating the dehydrated cake can be significantly reduced.
次に実施例を示す。Next, examples will be shown.
実施例 １
下水を生物処理した際に発生した余剰汚泥を２５００υ
１ｔに濃縮したものを対象にした。Example 1 Excess sludge generated during biological treatment of sewage was collected at 2500μ
The target was one concentrated to 1 ton.
従来法として、この濃縮余剰汚泥に乾燥固形物当りＦ
ｅ Ｃ４１３を１０％添加したときの−は４．８′″Ｃ
あや、これにＣａ （ＯＨ） ｇをα５％添加して…を
７としたのち、アニオン系高分子凝集剤を０．３幅添加
して真空脱水した。As a conventional method, this concentrated surplus sludge contains F per dry solid matter.
e When 10% of C413 is added, - is 4.8'''C
After adding α5% of Ca (OH) g to this to make it 7, 0.3 width of anionic polymer flocculant was added and vacuum dehydration was performed.
これに対して本発明方法として、同じ濃縮余剰汚泥にＦ
ｅ ＣＱ ３を１０％添加し、これにＨ２ＳＯ，を１
０％添加して−を２０にし、２０分間攪拌後ＣＩ （Ｏ
Ｈ） ｚを８％添加して−を５．１に調整後アニオン系
高分子凝集剤を０．３％添加して上記従来法と同一の真
空脱水機で脱水した。On the other hand, in the method of the present invention, F
e Add 10% CQ 3 and add 1 H2SO,
CI (O
H) 8% of z was added to adjust - to 5.1, then 0.3% of an anionic polymer flocculant was added, and water was dehydrated using the same vacuum dehydrator as in the conventional method.
これらの結果を次表に示したが、本発明方法によれば、
従来法よりも濾過速度を１．５倍程度高くとれ、しかも
脱水ケーキの含水率は５噂程度低くすることができた。These results are shown in the table below, and according to the method of the present invention,
The filtration rate was about 1.5 times higher than that of the conventional method, and the water content of the dehydrated cake was lowered by about 5 times.
以下余白
実施例 ２
上記実施例１と同一の濃縮汚泥を、上記従来法と本発明
方法によりそれぞれ同一の薬洗条件にて処理したのち、
それぞれフィルタプレスで脱水したが、従来法ではフィ
ルタプレスでは脱水不能であり、ベルトプレスを用いた
場合脱水ケーキ含水率は８５．５％であったのに対し、
本発明方法ではフィルタプレスにて含水率６６８％の脱
水ケーキを得ることができた。Example 2 The same thickened sludge as in Example 1 was treated under the same chemical washing conditions by the conventional method and the method of the present invention, respectively.
Each was dehydrated using a filter press, but in the conventional method, it was impossible to dehydrate using a filter press, and when a belt press was used, the moisture content of the dehydrated cake was 85.5%.
In the method of the present invention, a dehydrated cake with a water content of 668% could be obtained using a filter press.
図面は、本発明の一実！Ｓ態様を示す系統説明図である
。The drawing is a fruit of this invention! It is a system explanatory diagram showing S aspect.
Claims (1)
を濃縮し、この濃縮汚泥に無機凝集剤を添加してｐｉ（
１，５〜４．０にて３分間以上攪拌混合して汚泥を改質
したのち、アルカリ剤を添加して−を４〜６に調整し、
次いで高分子凝集剤を添加して脱水することを特徴とす
る余剰汚泥の脱水方法。 ２、 前記無機凝集剤を添加する汚泥の改質処理が、ｐ
Ｈ１５〜２５で行なわれるものである特許請求の範囲第
１項記載の方法。 五 前記無機凝集剤を添加する汚泥の改質処理が、鉱酸
を併用して行なわれるものである特許請求の範囲第１項
又は第２項記載の方法。 ４、 前記無機凝集剤が、硫酸アルミニウム又は塩化第
２鉄である特許請求の範囲第１項、第２項又は第３項記
載の方法。[Claims] 1. Excess sludge generated during biological treatment of organic wastewater is concentrated, and an inorganic flocculant is added to this concentrated sludge to produce pi(
After modifying the sludge by stirring and mixing at 1.5 to 4.0 for 3 minutes or more, add an alkaline agent to adjust - to 4 to 6.
A method for dewatering excess sludge, which is characterized by adding a polymer flocculant to dewater the sludge. 2. The sludge reforming treatment in which the inorganic flocculant is added is
The method according to claim 1, which is carried out in H15-25. 5. The method according to claim 1 or 2, wherein the sludge reforming treatment to which the inorganic flocculant is added is performed in combination with a mineral acid. 4. The method according to claim 1, 2, or 3, wherein the inorganic flocculant is aluminum sulfate or ferric chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56211081A JPS58112100A (en) | 1981-12-26 | 1981-12-26 | Dehydration of excess sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56211081A JPS58112100A (en) | 1981-12-26 | 1981-12-26 | Dehydration of excess sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58112100A true JPS58112100A (en) | 1983-07-04 |
Family
ID=16600089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56211081A Pending JPS58112100A (en) | 1981-12-26 | 1981-12-26 | Dehydration of excess sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58112100A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013233509A (en) * | 2012-05-09 | 2013-11-21 | Swing Corp | Method and apparatus of dehydration of organic sludge |
| RU2764433C1 (en) * | 2021-02-03 | 2022-01-17 | Людмила Николаевна Чумакова | Method for removing water from high-moisture agricultural and food industry waste using flocculants |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551851A (en) * | 1978-06-20 | 1980-01-09 | Kurita Water Ind Ltd | Dehydration of organic sludge |
-
1981
- 1981-12-26 JP JP56211081A patent/JPS58112100A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551851A (en) * | 1978-06-20 | 1980-01-09 | Kurita Water Ind Ltd | Dehydration of organic sludge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013233509A (en) * | 2012-05-09 | 2013-11-21 | Swing Corp | Method and apparatus of dehydration of organic sludge |
| RU2764433C1 (en) * | 2021-02-03 | 2022-01-17 | Людмила Николаевна Чумакова | Method for removing water from high-moisture agricultural and food industry waste using flocculants |
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