JPH07115040B2 - Excess sludge treatment method - Google Patents
Excess sludge treatment methodInfo
- Publication number
- JPH07115040B2 JPH07115040B2 JP62075905A JP7590587A JPH07115040B2 JP H07115040 B2 JPH07115040 B2 JP H07115040B2 JP 62075905 A JP62075905 A JP 62075905A JP 7590587 A JP7590587 A JP 7590587A JP H07115040 B2 JPH07115040 B2 JP H07115040B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- saponin
- excess sludge
- extract
- treatment
- 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
- 239000010802 sludge Substances 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 11
- 229930182490 saponin Natural products 0.000 claims description 23
- 150000007949 saponins Chemical class 0.000 claims description 23
- 239000001397 quillaja saponaria molina bark Substances 0.000 claims description 22
- 239000002351 wastewater Substances 0.000 claims description 3
- 241000157282 Aesculus Species 0.000 claims description 2
- 239000001653 FEMA 3120 Substances 0.000 claims description 2
- 244000068988 Glycine max Species 0.000 claims description 2
- 235000010469 Glycine max Nutrition 0.000 claims description 2
- 240000004670 Glycyrrhiza echinata Species 0.000 claims description 2
- 235000001453 Glycyrrhiza echinata Nutrition 0.000 claims description 2
- 235000006200 Glycyrrhiza glabra Nutrition 0.000 claims description 2
- 235000017382 Glycyrrhiza lepidota Nutrition 0.000 claims description 2
- 244000131316 Panax pseudoginseng Species 0.000 claims description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 2
- 244000295923 Yucca aloifolia Species 0.000 claims description 2
- 235000004552 Yucca aloifolia Nutrition 0.000 claims description 2
- 235000012044 Yucca brevifolia Nutrition 0.000 claims description 2
- 235000017049 Yucca glauca Nutrition 0.000 claims description 2
- ZINJLDJMHCUBIP-UHFFFAOYSA-N ethametsulfuron-methyl Chemical compound CCOC1=NC(NC)=NC(NC(=O)NS(=O)(=O)C=2C(=CC=CC=2)C(=O)OC)=N1 ZINJLDJMHCUBIP-UHFFFAOYSA-N 0.000 claims description 2
- 235000008434 ginseng Nutrition 0.000 claims description 2
- 235000010181 horse chestnut Nutrition 0.000 claims description 2
- 229940010454 licorice Drugs 0.000 claims description 2
- 241001071795 Gentiana Species 0.000 claims 1
- 239000010903 husk Substances 0.000 claims 1
- 235000017709 saponins Nutrition 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000004062 sedimentation Methods 0.000 description 10
- 238000005273 aeration Methods 0.000 description 9
- 208000005156 Dehydration Diseases 0.000 description 5
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 241001092473 Quillaja Species 0.000 description 2
- 235000009001 Quillaja saponaria Nutrition 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 239000001726 jatropha manihot extract Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229940106668 yucca extract Drugs 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 150000005856 steroid saponins Chemical class 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 150000008130 triterpenoid saponins Chemical class 0.000 description 1
- 229940096399 yucca root Drugs 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、活性汚泥法による汚水処理において発生する
余剰汚泥の処理方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for treating surplus sludge generated in wastewater treatment by an activated sludge method.
従来の技術 下水、し尿、各種有機性産業廃水など、有機汚濁質を含
有する汚水の活性汚泥法による処理においては、細菌、
かび、原生動物等の増殖にともない曝気槽内の活性汚泥
が増加する。活性汚泥は二次沈殿池において大部分の水
と分離され、一部はいわゆる返送汚泥として曝気槽に戻
されるが、大部分はいわゆる余剰汚泥として、沈降、遠
心脱水、ろ過等の手段により脱水されてケーキ状にな
り、廃棄または燃焼等の処理に付される。しかしなが
ら、活性汚泥は一般に嵩高で脱水困難なものであるか
ら、ポリアクリルアミド系凝集剤等を用いて凝集させて
から脱水処理するのが普通である。In the treatment of wastewater containing organic pollutants such as sewage, human waste and various organic industrial wastewater by the activated sludge method, bacteria,
As the mold and protozoa grow, the amount of activated sludge in the aeration tank increases. The activated sludge is separated from most of the water in the secondary sedimentation tank, and part of it is returned to the aeration tank as so-called return sludge, but most of it is so-called excess sludge, which is dehydrated by means such as sedimentation, centrifugal dehydration and filtration. It becomes cake-like and is subjected to disposal such as disposal or combustion. However, since activated sludge is generally bulky and difficult to dehydrate, it is usual that the activated sludge is coagulated with a polyacrylamide-based coagulant and then dehydrated.
発明が解決しようとする問題点 ポリアクリルアミド等の凝集剤を用いる従来の方法は、
活性汚泥凝集効果はすぐれていても、分解し難い合成凝
集剤によって汚泥の脱水ケーキや流出水が汚染されると
いう問題があった。Problems to be Solved by the Invention A conventional method using a coagulant such as polyacrylamide is
Although the activated sludge flocculation effect is excellent, there is a problem that the dewatered cake of sludge and the outflow water are contaminated by the synthetic flocculant which is difficult to decompose.
そこで本発明の目的は、微生物によって分解され易い凝
集剤により余剰汚泥を凝集させて脱水を容易にする余剰
汚泥処理方法を提供することにある。Therefore, an object of the present invention is to provide a method for treating excess sludge by aggregating excess sludge with a flocculant that is easily decomposed by microorganisms to facilitate dehydration.
問題点を解決するための手段 上記目的を達成することに成功した本発明は、余剰汚泥
の脱水処理に先立って汚泥をサポニンで処理することを
特徴とするものである。Means for Solving the Problems The present invention succeeding in achieving the above object is characterized by treating sludge with saponin prior to dehydration treatment of excess sludge.
サポニンには、ユッカ、サルサ、ルスカス等から抽出さ
れるステロイドサポニンと、キラヤ、ムクロジ、マロニ
エ、ルート、甘草、大豆、人参、紫胡、遠志から抽出さ
れるトリテルペノイドサポニンとがあるが、本発明で用
いるサポニンはこれらのいずれであっても差支えない。
またサポニンとして精製サポニンを用いる必要はなく、
粗サポニンすなわち上述のような原料植物体から水、低
級アルコールまたはこれらの混合物を用いて得られたサ
ポニン含有抽出物をそのまま用いてもよい。Saponins include steroid saponins extracted from yucca, salsa, luscus, etc., and triterpenoid saponins extracted from quilla, mukurodi, horse chestnut, root, licorice, soybean, ginseng, purple hu, senshi, but according to the present invention. The saponin used may be any of these.
Also, it is not necessary to use purified saponin as saponin,
The crude saponin, that is, the saponin-containing extract obtained by using water, a lower alcohol, or a mixture thereof from the raw material plant as described above may be used as it is.
本発明の処理方法は、普通には、活性汚泥法の常法によ
る汚水処理の余剰汚泥処理工程において実施される。す
なわち、曝気槽から第二次沈殿池に移された水より沈降
により分離された活性汚泥のうち、返送汚泥として曝気
槽に戻される部分と分けられた残りの余剰汚泥に対し
て、それが最終的な脱水処理に付されるまでの任意の段
階でサポニンを混入することにより行う。しかしなが
ら、サポニンの汚泥凝集作用は余剰汚泥として分離され
る以前の活性汚泥に対しても当然有効であり且つサポニ
ンが返送汚泥に入って曝気槽に入っても特に支障はない
から、返送汚泥分離前に、たとえば第二次沈殿池におけ
る沈降処理の段階で、サポニンを添加しても差支えな
い。The treatment method of the present invention is usually carried out in a surplus sludge treatment step of wastewater treatment by a conventional activated sludge method. That is, of the activated sludge separated from the water transferred from the aeration tank to the secondary settling tank by sedimentation, the remaining excess sludge separated from the part returned to the aeration tank as return sludge is the final It is performed by mixing saponin at any stage until it is subjected to a general dehydration treatment. However, the sludge flocculating action of saponin is naturally effective for activated sludge before it is separated as excess sludge, and there is no particular problem even if saponin enters the return sludge and enters the aeration tank. In addition, for example, saponin may be added at the stage of sedimentation treatment in the secondary sedimentation tank.
汚泥に対するサポニンの好適添加量は、サポニンの種類
および汚泥の種類や状態、固形分濃度等により異なる
が、通常、固形分濃度8,000〜15,000ppmの汚泥に対して
サポニンとして３〜300ppmが適当である。The suitable amount of saponin to be added to sludge varies depending on the type of saponin, the type and state of sludge, and the solid content concentration, but normally 3 to 300 ppm is appropriate as saponin for sludge with a solid content concentration of 8,000 to 15,000 ppm. .
サポニンで凝集させた余剰汚泥の脱水処理は、遠心脱水
機、フィルタープレス等、任意の脱水機を用いて行うこ
とができる。The excess sludge aggregated with saponin can be dehydrated by using any dehydrator such as a centrifugal dehydrator and a filter press.
発明の効果 本発明は次のような効果を奏する。EFFECTS OF THE INVENTION The present invention has the following effects.
（ａ）サポニンのすぐれた凝集作用により余剰汚泥がき
わめて脱水し易い性状になるため、含水率の低い汚泥脱
水ケーキを容易に得ることができ、ケーキの運搬、処理
およびコンポスト等への利用が容易になる。(A) Due to the excellent cohesive action of saponin, the excess sludge becomes extremely dehydratable, so that a sludge dewatering cake with a low water content can be easily obtained, and the cake can be easily transported, processed, and used for composting and the like. become.
（ｂ）サポニンはもちろん、サポニン含有抽出物をその
まま用いる場合におけるサポニン以外の成分も、微生物
によって分解され易いものであるから、長期間使用を続
けても曝気槽内蓄積や流出水汚染にともなう不都合を招
く恐れがない。また、脱水ケーキのコンポスト生成物の
有効利用の妨げになることもない。(B) Not only saponin but also the components other than saponin when the saponin-containing extract is used as they are are easily decomposed by microorganisms, so that even if the extract is used for a long period of time, it is inconvenient due to accumulation in the aeration tank and contamination of runoff water. There is no fear of inviting. Further, it does not hinder the effective use of the compost product of the dehydrated cake.
実施例 以下、実施例を示して本発明を説明する。EXAMPLES Hereinafter, the present invention will be described with reference to examples.
実施例１ ユッカの根10kgを細断し、90℃の熱水50lで３時間抽出
後、固液を分離した。同様の操作をさらに２回くり返し
て、抽出液合計230lを得た。この抽出液を濃縮し次いで
乾燥して、サポニン含有量10.5％の抽出物3.2kgを得
た。Example 1 10 kg of yucca root was shredded and extracted with 50 l of hot water at 90 ° C. for 3 hours, and then a solid-liquid was separated. The same operation was repeated twice more to obtain a total of 230 l of the extract. The extract was concentrated and then dried to obtain 3.2 kg of an extract having a saponin content of 10.5%.
一方、食品工場の廃水（日量780m3,BOD 210mg/l）をpH
7.0、空気量800m3/Hで曝気処理し、曝気槽から溢流した
被処理水を第二次沈殿池に送った。そこで沈降分離され
た活性汚泥の一部は曝気槽に戻し、残りを余剰汚泥とし
て沈降濃縮槽に送った。濃縮槽中の余剰汚泥に対して、
上記ユッカ抽出物50ppmを添加し、攪拌してから静置
し、汚泥を沈降させた。このときSV30（沈降性の目安と
なる30分後のスラッジ体積）は85％から21％に改善さ
れ、処理時間が短縮された。On the other hand, the pH of wastewater from a food factory (780 m 3 / day, BOD 210 mg / l)
Aeration treatment was performed at 7.0 with an air volume of 800 m 3 / H, and the water to be treated overflowing from the aeration tank was sent to the secondary sedimentation tank. Therefore, part of the activated sludge that had been separated by sedimentation was returned to the aeration tank, and the rest was sent to the sedimentation thickening tank as excess sludge. For excess sludge in the thickener,
The above-mentioned yucca extract (50 ppm) was added, and the mixture was stirred and allowed to stand to settle the sludge. At this time, SV30 (sludge volume after 30 minutes, which is a measure of sedimentation) was improved from 85% to 21%, and the treatment time was shortened.
このときの流出水はBOD10ppmであった。沈降した汚泥は
70％を返送し、30％を濃縮槽においてさらに沈降分離し
た後、遠心分離機で脱水した。得られた脱水ケーキの含
水率は88％から76％に改善された。The effluent water at this time was 10 ppm BOD. Settled sludge
70% was returned, and 30% was further separated by sedimentation in a concentration tank and then dehydrated by a centrifuge. The water content of the obtained dehydrated cake was improved from 88% to 76%.
実施例２ キラヤ樹皮10kgを細断し、50％v/vメタノール100lで２
時間還流抽出後、固液を分離した。同様の操作をくり返
して、抽出液合計190lを得た。この抽出液を濃縮し次い
で乾燥して、サポニン含有量19％の抽出物2.1kgを得
た。Example 2 10 kg of Quillaja bark was shredded and 100% of 50% v / v methanol was added to 2
After extraction under reflux for an hour, solid-liquid was separated. The same operation was repeated to obtain a total of 190 l of extract. The extract was concentrated and then dried to obtain 2.1 kg of an extract having a saponin content of 19%.
この抽出物を、濃縮槽でユッカ抽出物を加えないほかは
実施例１と同様の汚水処理において濃縮後遠心脱水前の
余剰汚泥に100ppm添加した。遠心脱水ケーキの含水率
は、キラヤ抽出物無添加の場合の88％から75％に改善さ
れた。100 ppm of this extract was added to the excess sludge after concentration and before centrifugal dehydration in the same wastewater treatment as in Example 1 except that the yucca extract was not added in the concentration tank. The water content of the spin-dried cake was improved from 88% in the case without addition of Quillaja extract to 75%.
Claims (2)
する余剰汚泥を脱水処理するに当り、余剰汚泥をあらか
じめサポニンで処理しておくことを特徴とする余剰汚泥
処理方法。1. A method for treating excess sludge, which is characterized in that the excess sludge is previously treated with saponin before the excess sludge generated during the treatment of wastewater by the activated sludge method is dehydrated.
カス、キラヤ、ムクロジ、マロニエ、ルート、甘草、大
豆、人参、紫胡または遠志の抽出物を用いて余剰汚泥を
処理する特許請求の範囲第１項記載の方法。2. A method for treating excess sludge with an extract of yucca, salsa, luscus, quilla, mukurodi, horse chestnut, root, licorice, soybean, ginseng, purple husk or gentian containing saponin. Method described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62075905A JPH07115040B2 (en) | 1987-03-31 | 1987-03-31 | Excess sludge treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62075905A JPH07115040B2 (en) | 1987-03-31 | 1987-03-31 | Excess sludge treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63242400A JPS63242400A (en) | 1988-10-07 |
| JPH07115040B2 true JPH07115040B2 (en) | 1995-12-13 |
Family
ID=13589816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62075905A Expired - Lifetime JPH07115040B2 (en) | 1987-03-31 | 1987-03-31 | Excess sludge treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07115040B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2309036A (en) | 1996-01-11 | 1997-07-16 | Garth M Henderson | Saponin and carbohydrate promote bio-degradation of organic waste |
| JP3893545B2 (en) * | 1996-04-30 | 2007-03-14 | 榮一 田代 | Anaerobic digestion of sludge or ginger urine |
| JP4460081B2 (en) * | 1997-09-28 | 2010-05-12 | 榮一 田代 | Anaerobic digestion of sludge |
| CN104788007A (en) * | 2015-04-29 | 2015-07-22 | 北京同创碧源水务科技发展有限公司 | Deep dehydration method of sludge after domestic sewage treatment |
| CN115108706A (en) * | 2022-06-07 | 2022-09-27 | 河北国惠环保科技有限公司 | A method for improving dewatering performance of fermentation sludge by using biosurfactant |
-
1987
- 1987-03-31 JP JP62075905A patent/JPH07115040B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63242400A (en) | 1988-10-07 |
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