JPS6369600A - Dehydrating method for sludge - Google Patents
Dehydrating method for sludgeInfo
- Publication number
- JPS6369600A JPS6369600A JP61213088A JP21308886A JPS6369600A JP S6369600 A JPS6369600 A JP S6369600A JP 61213088 A JP61213088 A JP 61213088A JP 21308886 A JP21308886 A JP 21308886A JP S6369600 A JPS6369600 A JP S6369600A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- flocs
- added
- slaked lime
- boric acid
- 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 41
- 238000000034 method Methods 0.000 title claims description 23
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- -1 alkali metal salt Chemical class 0.000 claims abstract description 12
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004327 boric acid Substances 0.000 claims abstract description 11
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 11
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 11
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 11
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 11
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 10
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims description 13
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 abstract description 9
- 238000006297 dehydration reaction Methods 0.000 abstract description 9
- 229910021538 borax Inorganic materials 0.000 abstract description 7
- 235000010339 sodium tetraborate Nutrition 0.000 abstract description 7
- 239000004328 sodium tetraborate Substances 0.000 abstract description 4
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 abstract description 3
- 208000005156 Dehydration Diseases 0.000 abstract 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract 2
- 239000001257 hydrogen Substances 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000004744 fabric Substances 0.000 description 16
- 239000002351 wastewater Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 239000005909 Kieselgur Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- QFBYWORVYPLCIN-UHFFFAOYSA-N B([O-])([O-])OB([O-])[O-].[K+].[K+].[K+].[K+] Chemical compound B([O-])([O-])OB([O-])[O-].[K+].[K+].[K+].[K+] QFBYWORVYPLCIN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- FZQSLXQPHPOTHG-UHFFFAOYSA-N [K+].[K+].O1B([O-])OB2OB([O-])OB1O2 Chemical compound [K+].[K+].O1B([O-])OB2OB([O-])OB1O2 FZQSLXQPHPOTHG-UHFFFAOYSA-N 0.000 description 1
- XVDCMYGYCHKSOH-UHFFFAOYSA-N [K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-] Chemical compound [K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-] XVDCMYGYCHKSOH-UHFFFAOYSA-N 0.000 description 1
- BUWURQPWRDROFU-UHFFFAOYSA-N [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-] Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-] BUWURQPWRDROFU-UHFFFAOYSA-N 0.000 description 1
- 229920006318 anionic polymer Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- PYUBPZNJWXUSID-UHFFFAOYSA-N pentadecapotassium;pentaborate Chemical compound [K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[K+].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-] PYUBPZNJWXUSID-UHFFFAOYSA-N 0.000 description 1
- VPOLVWCUBVJURT-UHFFFAOYSA-N pentadecasodium;pentaborate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-] VPOLVWCUBVJURT-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- JVUYWILPYBCNNG-UHFFFAOYSA-N potassium;oxido(oxo)borane Chemical compound [K+].[O-]B=O JVUYWILPYBCNNG-UHFFFAOYSA-N 0.000 description 1
- NVIFVTYDZMXWGX-UHFFFAOYSA-N sodium metaborate Chemical compound [Na+].[O-]B=O NVIFVTYDZMXWGX-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- DPUZPWAFXJXHBN-UHFFFAOYSA-N tetrasodium dioxidoboranyloxy(dioxido)borane Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]B([O-])OB([O-])[O-] DPUZPWAFXJXHBN-UHFFFAOYSA-N 0.000 description 1
- WUUHFRRPHJEEKV-UHFFFAOYSA-N tripotassium borate Chemical compound [K+].[K+].[K+].[O-]B([O-])[O-] WUUHFRRPHJEEKV-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、例えば建材メーカー、自動車工場、電機機器
工場、家具工場、製靴工場等から排出される、接着剤や
塗料の製造工程での廃液、あるいは接着剤や塗料を使用
する装置の洗浄液等、接着性のある物質を含む汚泥の脱
水方法に関するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to the use of waste liquids from the manufacturing process of adhesives and paints, which are discharged from, for example, building material manufacturers, automobile factories, electrical equipment factories, furniture factories, shoe factories, etc. It also relates to a method for dewatering sludge containing adhesive substances, such as cleaning fluids for equipment that uses adhesives or paints.
（従来の技術）
一般に、生産工程から生じた排水汚泥の脱水機としては
、濾布走行型脱水機、遠心分離機、フィルタープレス、
真空濾過機等が広く使用されている。(Prior art) In general, dehydrators for wastewater sludge generated from production processes include filter cloth running type dehydrators, centrifuges, filter presses,
Vacuum filters and the like are widely used.
ところが、上記したような脱水機により接着剤等、接着
性を有する物質を含む汚泥を脱水しようとすると、濾布
や金網に汚泥が付着して目詰まりを起こし、このため長
時間処理が行えないとともに、付着した汚泥が固化して
しまうと濾布が使用不可能になるといった問題があった
。However, when attempting to dewater sludge containing adhesive substances such as adhesives using the dehydrator described above, the sludge adheres to the filter cloth or wire mesh, causing clogging, making it impossible to process for a long time. Additionally, there was a problem in that the filter cloth became unusable if the adhered sludge solidified.
そこで、従来、そのような汚泥の脱水方法として、例え
ば真空脱水機において、ポリ塩化アルミニウム等の無機
凝集剤を添加するとともに、濾布の表面に珪藻土を厚さ
３０〜４０ ｍｍに巻き付けた、いわゆるプレコートフ
ィルターを使用する方法が行われている。Therefore, as a conventional method for dewatering such sludge, for example, in a vacuum dehydrator, an inorganic flocculant such as polyaluminum chloride is added, and diatomaceous earth is wrapped around the surface of a filter cloth to a thickness of 30 to 40 mm. A method using a pre-coated filter is being used.
また、他の方法として、汚泥にポリ塩化アルミニウム等
の無機凝集剤を添加後、消石灰を添加して水素イオン濃
度（ｐｌ＋）を３１し、次いで、アニオン性高分子凝集
剤を添加し、さらに、接着性を緩和して汚泥の脱水性を
向上させるため、木粉等の助剤を大量に投入して脱水す
る方法も行われている。In addition, as another method, after adding an inorganic flocculant such as polyaluminum chloride to the sludge, slaked lime is added to make the hydrogen ion concentration (pl+) 31, then an anionic polymer flocculant is added, and further, In order to improve the dewatering properties of sludge by reducing its adhesion, there is also a method of dewatering sludge by adding a large amount of auxiliary agent such as wood flour.
（発明が解決しようとする問題点）
しかしながら、上記従来の脱水方法のうち、前者にあっ
ては、プレコートフィルターの使用期間が１日と短いう
え、濾布に珪藻土を巻き付けるのに時間がかかるため、
ランニングコストが増加するとともに、脱水ケーキ量が
増大し、その処理費が嵩むといった問題があった。(Problems to be Solved by the Invention) However, in the former of the above conventional dehydration methods, the period of use of the pre-coated filter is only one day, and it takes time to wrap diatomaceous earth around the filter cloth. ,
There were problems in that the running cost increased, the amount of dehydrated cake increased, and the processing cost increased.
一方、後者にあっては、汚泥に接着性が残るとともに凝
集フロックが小さく、濾布走行式１１５を本機を使用す
る場合には、濾布が目詰まりし易いうえ、剥離性も悪く
、この方法もまた実用的な方法とはいえない。On the other hand, in the case of the latter, adhesiveness remains in the sludge and flocs are small, and when using this machine with filter cloth traveling type 115, the filter cloth is easily clogged and has poor removability. The method is also not practical.
（発明の目的）
本発明は、上記従来の問題点に鑑みてなされたもので、
その目的とするところは、脱水助剤の使用を避けて、ラ
ンニングコストを下げ、且つ脱水ケーキ量を大幅に減少
させて処理費を低減させるとともに、脱水汚泥の接着性
を解消し、濾布走行型脱水機等、前記したような汎用的
脱水機の使用を可能とすることにある。(Object of the invention) The present invention has been made in view of the above-mentioned conventional problems.
The purpose of this is to avoid the use of dewatering aids, reduce running costs, and significantly reduce the amount of dewatered cake to reduce processing costs. At the same time, it eliminates the adhesiveness of dewatered sludge and reduces the running cost of the filter cloth. The purpose of this invention is to enable the use of general-purpose dehydrators such as the type dehydrator described above.
（発明の構成）
すなわち、本発明に係る汚泥の脱水方法は、接着剤等、
接着性を有する物質を含む汚泥の脱水にあたり、汚泥に
ポリ塩化アルミニウムを添加して微細なフロックを形成
した後、消石灰を添加して水素イオン濃度を調整し、も
しくは汚泥にポリ塩化アルミニウムと消石灰とを同時に
添加して微細なフロックを形成するとともに水素イオン
）フ度を調整した後、硼酸のアルカリ金属塩またはその
含水塩を添加し、これにより生成した粗大なフロックを
脱水するものである。(Structure of the Invention) That is, the sludge dewatering method according to the present invention uses an adhesive or the like,
When dewatering sludge containing adhesive substances, polyaluminum chloride is added to the sludge to form fine flocs, and then slaked lime is added to adjust the hydrogen ion concentration, or polyaluminum chloride and slaked lime are added to the sludge. After simultaneously adding boric acid to form fine flocs and adjusting the hydrogen ion concentration, an alkali metal salt of boric acid or its hydrated salt is added, and the coarse flocs thus formed are dehydrated.
次に、本発明の脱水方法を図面を参照して説明すると、
第１反応槽１に送られてきた汚泥に、溶解槽２から送出
されたポリ塩化アルミニウムを添加し、微細なフロック
を形成する。続いて、溶解槽３から消石灰を第１反応槽
１に送り、汚泥のｐＨを調整する。Next, the dehydration method of the present invention will be explained with reference to the drawings.
Polyaluminum chloride sent from the dissolution tank 2 is added to the sludge sent to the first reaction tank 1 to form fine flocs. Subsequently, slaked lime is sent from the dissolution tank 3 to the first reaction tank 1 to adjust the pH of the sludge.
ここで、ポリ塩化アルミニウムの添加量としては、汚泥
の濃度、すなわち排水中の浮遊物質の濃度（以下Ｓ Ｓ
（Ｓｕｓｐｅｎｄｅｄ ５ｏｌｉｄ ） ？Ｑ度とい
う〕に対して１０〜２５％が好ましく、より好ましくは
２３％程度である。これを具体的数値で表すと、ｓｓ４
度が例えば２２０００ｐｐｍの排水の場合、この排水に
対して２２００〜５５００ｐｐｍの範囲で添加するのが
好ましい。ポリ塩化アルミニウムの添加量が上記したよ
うな範囲であると良好なフロックを形成するが、添加量
が１０％より少ないと添加量不足となってフロックが完
全に形成されず、また２５％より多いと添加過剰となっ
て、一旦凝集したフロックが再び破壊されてしまい、好
ましくない。Here, the amount of polyaluminum chloride added is determined by the concentration of sludge, that is, the concentration of suspended solids in wastewater (hereinafter referred to as S S
(Suspended 5olid)? It is preferably 10 to 25%, more preferably about 23%. Expressing this in concrete numbers, ss4
For example, in the case of waste water having a concentration of 22,000 ppm, it is preferable to add it to the waste water in a range of 2,200 to 5,500 ppm. If the amount of polyaluminum chloride added is within the above range, good flocs will be formed, but if the amount added is less than 10%, the amount added will be insufficient and flocs will not be completely formed, and if it is more than 25%. This is undesirable because excessive addition will cause the flocs that have coagulated to be destroyed again.
一方、消石灰の添加ｈｔとしては、ポリ塩化アルミニウ
ムを添加した汚泥を中和する呈だけ加えればよく、ＳＳ
？３度に対して９％程度、具体的には、例えばＳＳ？Ｊ
ｍ度が２２０００ｐｐｍの排水に対して２０００ｐｐｍ
程度が最適であり、排水中の微細な浮遊物買置の凝集作
用に補助的効果がある。On the other hand, it is sufficient to add slaked lime only to the extent that it neutralizes the sludge added with polyaluminum chloride.
? About 9% for 3 degrees, specifically, for example, SS? J
2000ppm for wastewater with m degree of 22000ppm
The degree is optimal, and it has an auxiliary effect on the flocculation of fine suspended matter in wastewater.
なお、上記の説明では、汚泥にまずポリ塩化アルミニウ
ムを添加した後、消石灰を添加しているが、これに限ら
ず、両者を同時に加えてもよい。In the above description, polyaluminum chloride is first added to the sludge, and then slaked lime is added, but the invention is not limited to this, and both may be added at the same time.
次に、第１反応槽１において上述の如く処理された汚泥
は、第２反応槽４に送られ、ここで、溶解槽５から送ら
れてきた硼酸のアルカリ金属塩またはその含水塩の水溶
液が汚泥に添加され、攪拌される。これによって粗大な
フロックが生成され、このフロックの形成された汚泥は
脱水機６へ送られて、ここで脱水される。Next, the sludge treated as described above in the first reaction tank 1 is sent to the second reaction tank 4, where an aqueous solution of an alkali metal salt of boric acid or a hydrated salt thereof sent from the dissolution tank 5 is added. It is added to the sludge and stirred. This generates coarse flocs, and the sludge in which these flocs have been formed is sent to the dehydrator 6, where it is dewatered.
上記硼酸のアルカリ金属塩としては、例えば、硼酸ナト
リウム、硼酸カリウム、メタ硼酸ナトリウム、メタ硼酸
カリウム、四硼酸ナトリウム、四硼酸カリウム、五硼酸
ナトリウム、五硼酸カリウム、六硼酸ナトリウム、六硼
酸カリウム、へ硼酸ナトリウム、へ硼酸カリウム、二硼
酸ナトリウム、二硼酸カリウムが挙げられる。また、硼
酸のアルカリ金属塩の含水塩としては上記列挙した各種
硼酸のアルカリ金属塩の含水塩が挙げられる。これらの
なかでも、硼砂として知られている四硼酸ナトリウムの
含水塩が、天然鉱物より簡単に得られるうえから好まし
い。Examples of the alkali metal salts of boric acid include sodium borate, potassium borate, sodium metaborate, potassium metaborate, sodium tetraborate, potassium tetraborate, sodium pentaborate, potassium pentaborate, sodium hexaborate, potassium hexaborate, etc. Examples include sodium borate, potassium heborate, sodium diborate, and potassium diborate. Examples of the hydrated salts of alkali metal salts of boric acid include the hydrated salts of the various alkali metal salts of boric acid listed above. Among these, the hydrated salt of sodium tetraborate known as borax is preferred because it is easier to obtain than natural minerals.
ここで、硼酸のアルカリ金属塩の添加量としては、汚泥
の濃度、すなわちＳＳ；、：度に対して２０〜３５％が
好ましく、より好ましくは３・１％前後である。これを
具体的数値で表すと、ＳＳ？Ｗ度が例えば２２０００ｐ
ｐ…の排水の場合、この排水に対して４４００〜７７０
０ｐｐｍの範囲で添加するのが好ましい。硼酸のアルカ
リ金属塩の添加量が上記したような範囲であると接着性
のない粗大化した良好なフロックを形成するが、添加量
が２０％より少ないと添加量不足となって接着性のない
粗大化したフロックが形成されず、また３５％より多い
と添加過剰となって、一旦１■大化したフロックが破壊
され、脱水性が不良となる。Here, the amount of the alkali metal salt of boric acid added is preferably 20 to 35%, more preferably around 3.1%, based on the concentration of sludge, ie, SS. If you express this in concrete numbers, is it SS? For example, W degree is 22000p
In the case of wastewater of p..., 4400 to 770 for this wastewater.
It is preferable to add in a range of 0 ppm. If the amount of the alkali metal salt of boric acid added is within the above range, a good coarse floc with no adhesive properties will be formed, but if the amount added is less than 20%, the amount added will be insufficient and will result in no adhesive properties. Coarse flocs are not formed, and if the amount exceeds 35%, the addition becomes excessive, and the flocs once enlarged to one size are destroyed, resulting in poor dewatering properties.
また、上記脱水機６としては、本発明の方法によって汚
泥の接着性が解消されたことにより、前記したような濾
布走行型脱水機等の汎用的脱水機が使用可能である。Moreover, as the dehydrator 6, a general-purpose dehydrator such as the above-mentioned filter cloth traveling type dehydrator can be used, since the adhesiveness of sludge is eliminated by the method of the present invention.
次に、本発明の実施例を挙げる。Next, examples of the present invention will be given.
（実施例１）
ＳＳＣ度が２２０００ｐｐｍのポリ酢酸ビニル系接着剤
の排水汚泥を試料とし、これを濾布走行式脱水機により
、本発明の方法と、比較例として従来の方法とでそれぞ
れ処理した。処理条件および結果を表１に示す。(Example 1) A sample of wastewater sludge from a polyvinyl acetate adhesive with an SSC degree of 22,000 ppm was treated using a filter cloth running dehydrator using the method of the present invention and a conventional method as a comparative example. . The treatment conditions and results are shown in Table 1.
（以下余白）
吹 １〕
表１から、本発明の脱水方法によれば、フロックの大き
さが大きく、且つその強度も強く、また脱水ケーキの含
水率が低いうえその厚みも大きく、しかもＳＳ回収率お
よび濾布からの剥離性に優れていることがわかる。これ
に対し、従来の脱水方法によれば、全ての点で本発明方
法で処理した場合より劣っていることがわかる。(The following is a blank space) Blowing 1] From Table 1, according to the dehydration method of the present invention, the size of the flocs is large and its strength is strong, the water content of the dehydrated cake is low and its thickness is large, and SS recovery is possible. It can be seen that the filter cloth has excellent peelability and removability from the filter cloth. In contrast, it can be seen that the conventional dehydration method is inferior to the method of the present invention in all respects.
（実施例２）
ＳＳ濃度が２２０００ｐｐｍのポリ酢酸ビニル系接着剤
の排水汚泥を試料とし、これをロールプレス式脱水機に
より、本発明の方法と、比較例として従来の方法とでそ
れぞれ処理した。処理条件および結果を表２に示す。(Example 2) A wastewater sludge of a polyvinyl acetate adhesive having an SS concentration of 22,000 ppm was used as a sample, and treated using a roll press dehydrator using the method of the present invention and a conventional method as a comparative example. The treatment conditions and results are shown in Table 2.
（以下余白）
改 ２〕
表２から、本発明の脱水方法によれば、フロックの大き
さが大きく、且つその強度も強く、また脱水ケーキの含
水率が低いうえその厚みも大きく、しかもＳＳ回収率お
よび濾布からの剥離性に優れていることがわかる。これ
に対し、従来の脱水方法によれば、全ての点で本発明方
法で処理した場合より劣っていることがわかる。(The following is a blank space) Revised 2] From Table 2, according to the dehydration method of the present invention, the size of the flocs is large and its strength is strong, the moisture content of the dehydrated cake is low and its thickness is large, and SS recovery is possible. It can be seen that the filter cloth has excellent peelability and removability from the filter cloth. In contrast, it can be seen that the conventional dehydration method is inferior to the method of the present invention in all respects.
（発明の効果）
以上説明したように、本発明に係る汚泥の脱水方法によ
れば、従来のように脱水助剤を一切用いないため、ラン
ニングコストを抑えることができ、且つ脱水ケーキ量が
大幅に減少するから、処理費を低減することができる。(Effects of the Invention) As explained above, according to the sludge dewatering method according to the present invention, unlike conventional methods, no dehydration aid is used at all, so running costs can be reduced and the amount of dewatered cake can be significantly reduced. The processing cost can be reduced.
また、それとともに、脱水汚泥の接着性が解消されるか
ら、従来のように汚泥が濾布に付着して目詰まりを起こ
したり、剥離不能となったりすることがなく、したがっ
て濾布走行型脱水機をはじめとする汎用的脱水機を使用
することができる。At the same time, since the adhesiveness of dewatered sludge is eliminated, the sludge does not adhere to the filter cloth and cause clogging or become impossible to remove, as in the case of conventional filter cloth running type dewatering. A general-purpose dehydrator such as a dehydrator can be used.
図は本発明に係る汚泥の脱水方法の一実施例を示す概略
工程図である。
特許出願人 セキスイエンバイロメント株式会社代表者
大宅淳平The figure is a schematic process diagram showing an embodiment of the sludge dewatering method according to the present invention. Patent applicant: Junpei Oya, representative of Sekisui Environment Co., Ltd.
Claims (1)
あたり、汚泥にポリ塩化アルミニウムを添加して微細な
フロックを形成した後、消石灰を添加して水素イオン濃
度を調整し、もしくは汚泥にポリ塩化アルミニウムと消
石灰とを同時に添加して微細なフロックを形成するとと
もに水素イオン濃度を調整した後、硼酸のアルカリ金属
塩またはその含水塩を添加し、これにより生成した粗大
なフロックを脱水することを特徴とする汚泥の脱水方法
。1) When dewatering sludge containing adhesive substances such as adhesives, polyaluminum chloride is added to the sludge to form fine flocs, and then slaked lime is added to adjust the hydrogen ion concentration, or the sludge is After simultaneously adding polyaluminum chloride and slaked lime to form fine flocs and adjusting the hydrogen ion concentration, add an alkali metal salt of boric acid or its hydrated salt, and dehydrate the coarse flocs thus generated. A sludge dewatering method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61213088A JPS6369600A (en) | 1986-09-10 | 1986-09-10 | Dehydrating method for sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61213088A JPS6369600A (en) | 1986-09-10 | 1986-09-10 | Dehydrating method for sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6369600A true JPS6369600A (en) | 1988-03-29 |
Family
ID=16633356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61213088A Pending JPS6369600A (en) | 1986-09-10 | 1986-09-10 | Dehydrating method for sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6369600A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001044110A1 (en) * | 1999-12-16 | 2001-06-21 | Feralco Ab | Flocculants |
-
1986
- 1986-09-10 JP JP61213088A patent/JPS6369600A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001044110A1 (en) * | 1999-12-16 | 2001-06-21 | Feralco Ab | Flocculants |
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