JPH0722748B2 - Sewage and sludge treatment method - Google Patents
Sewage and sludge treatment methodInfo
- Publication number
- JPH0722748B2 JPH0722748B2 JP63292284A JP29228488A JPH0722748B2 JP H0722748 B2 JPH0722748 B2 JP H0722748B2 JP 63292284 A JP63292284 A JP 63292284A JP 29228488 A JP29228488 A JP 29228488A JP H0722748 B2 JPH0722748 B2 JP H0722748B2
- Authority
- JP
- Japan
- Prior art keywords
- chromaticity
- sludge
- chitosan
- sewage
- 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 31
- 238000000034 method Methods 0.000 title claims description 14
- 239000010865 sewage Substances 0.000 title claims description 12
- 229920001661 Chitosan Polymers 0.000 claims description 32
- 239000002245 particle Substances 0.000 claims description 24
- 238000005345 coagulation Methods 0.000 claims description 7
- 230000015271 coagulation Effects 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 238000001179 sorption measurement Methods 0.000 description 18
- 239000007788 liquid Substances 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000010800 human waste Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005189 flocculation Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 210000002700 urine Anatomy 0.000 description 3
- 239000000149 chemical water pollutant Substances 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920002101 Chitin Polymers 0.000 description 1
- 229920002683 Glycosaminoglycan Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005904 alkaline hydrolysis reaction Methods 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229950006780 n-acetylglucosamine Drugs 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Water Treatment By Sorption (AREA)
- 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、例えばし尿の生物処理水、ごみ埋立浸出汚水
の生物処理水等のように、黄褐色等の色度成分を含む汚
水から色度成分を吸着除去し、低色度の処理水を得ると
ともに、汚水の生物処理に伴なつて発生する汚泥を合理
的に凝集脱水する汚水・汚泥の処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a method for producing a color from wastewater containing a chromaticity component such as yellowish brown, such as biologically treated water of human waste and biologically treated water of waste landfill leachate. The present invention relates to a method for treating sewage and sludge, in which treated water of low chromaticity is obtained by adsorbing and removing the degree component, and the sludge generated by biological treatment of sewage is reasonably coagulated and dehydrated.
従来、し尿の生物処理水から色度成分を除去するには、
硫酸アルミニウム、塩化第２鉄のような無機凝集剤を注
入して、凝集除去する方法が最も代表的である。この生
物処理水の色度成分は、主として黄色のもので、腐値酸
類似物質からなると考えられている。Conventionally, in order to remove the chromaticity component from the biologically treated water of human waste,
The most typical method is to inject an inorganic coagulant such as aluminum sulfate or ferric chloride to coagulate and remove it. The chromaticity component of this biologically treated water is mainly yellow and is considered to consist of spoilage acid-like substances.
色度成分の除去法としては、前記の凝集除去法以外に、
オゾン処理、活性炭吸着法などがあるが、ランニングコ
ストが高いため、凝集除去を行つた後のポリツシングと
して適用されるのが普通である。As a method for removing the chromaticity component, in addition to the above-described coagulation removing method,
Although there are ozone treatment, activated carbon adsorption method, etc., since they are high in running cost, they are usually applied as polishing after performing coagulation removal.
前記の凝集除去法は、安価なランニングコストで、比較
的高い色度除去率が得られるという長所がある反面、Fe
(OH)3又はAl(OH)3系の離脱水性汚泥が発生するという大
きな欠点がある。The above coagulation removal method has an advantage that a relatively high chromaticity removal rate can be obtained at a low running cost.
There is a major drawback in that (OH) 3 or Al (OH) 3 based detached aqueous sludge is generated.
したがつて、凝集除去法と同等の色度除去効果が得ら
れ、しかも離脱水性汚泥が発生しない新規な色度の除去
法の開発が望まれている。Therefore, there is a demand for the development of a novel chromaticity removing method that can obtain the same chromaticity removing effect as the coagulation removing method and that does not generate detached aqueous sludge.
本発明は、色度成分を含有する汚水から、離脱水性汚泥
が発生せず、しかも低ランニングコストで色度成分を除
去することを目的とするものである。また、本発明はそ
の色度成分の除去に用いた除去剤を溶解して汚泥の処理
に有効に利用することを目的とするものである。An object of the present invention is to remove chromaticity components from sewage containing chromaticity components at a low running cost without generating detached aqueous sludge. Another object of the present invention is to dissolve the removing agent used for removing the chromaticity component and effectively use it for treating sludge.
本発明は、色度成分を含有する汚水をキトサン粒子と接
触せしめて色度成分を吸着除去し、該色度成分を吸着し
たキトサン粒子を、前記接触工程から分離し、酸性水溶
液に溶解し、この溶解液を有機性汚泥に添加して凝集さ
せることを特徴とする汚水・汚泥の処理方法である。The present invention, by contacting sewage containing a chromaticity component with the chitosan particles to adsorb and remove the chromaticity component, the chitosan particles adsorbing the chromaticity component are separated from the contacting step, and dissolved in an acidic aqueous solution, A method for treating sewage / sludge is characterized in that the solution is added to organic sludge to coagulate.
本発明の処理対象とする色度成分を含有する汚水として
は、種々ある汚水の中、有機物を多量に含むものはその
有機物などがキトサン粒子に付着して色度成分の吸着を
阻害したりして効率が悪いので、生物処理などの処理に
よりCODやBODを大幅に減少して、不純物として色度成分
を多量に含み、あるいはそれが主として問題になるよう
な汚水を用いるのが好ましい。例えば、し尿の生物処理
水、ごみ埋立浸出汚水の生物処理水を処理するが、特に
前者は高濃度の黄色色度成分を含むので、処理対象とし
て好適である。また、し尿の生物処理水を限外濾過膜分
離して得た膜透過水を処理してもよい。The sewage containing the chromaticity component to be treated in the present invention, among various sewage, those containing a large amount of organic matter, such organic matter adheres to the chitosan particles and inhibits the adsorption of the chromaticity component. Therefore, it is preferable to use sewage that has a large decrease in COD and BOD by treatment such as biological treatment, contains a large amount of chromaticity components as impurities, or is a major problem. For example, biologically treated water of human waste and biologically treated water of landfill leachate wastewater are treated. Especially, the former is suitable as a treatment target because it contains a high-concentration yellow chromaticity component. Moreover, you may process the membrane permeate obtained by carrying out the ultrafiltration membrane separation of the biologically treated water of human waste.
前記汚水との接触に用いるキトサン粒子は、実用上は例
えばカニ殻から採取したものを用いるのが好ましく、粒
径は１〜10mm位の範囲のものが用いられるが、接触効率
を上げるためには２〜4mmのものが好ましい。なお、キ
トサンは、塩基性多糖に属するもので、合成上はムコ多
糖の一種であるキチン（β−ポリ−Ｎ−アセチルグルコ
サミン）の側鎖をアルカリ加水分解して得られるが、工
業的に利用する関係で前記したように天然産のものを用
いるのがよい。The chitosan particles used for contact with the sewage are preferably used, for example, those collected from crab shells in practice, and the particle size is in the range of 1 to 10 mm, but in order to improve the contact efficiency. It is preferably 2 to 4 mm. Chitosan belongs to the basic polysaccharides and is obtained by alkaline hydrolysis of the side chain of chitin (β-poly-N-acetylglucosamine), which is a kind of mucopolysaccharide synthetically. Therefore, it is preferable to use a naturally occurring product as described above.
本発明では、汚水からキトサン粒子によつて色度成分を
吸着除去するだけではなく、色度成分を吸着して飽和し
たキトサン粒子を接触工程から分離し、それを希酸に溶
解し、その溶解液を有機性汚泥に添加することによりそ
の汚泥を凝集させることができるので、それを容易に分
離又は処理することができる。In the present invention, not only the chromaticity component is adsorbed and removed from the wastewater by the chitosan particles, but the chitosan particles saturated by adsorbing the chromaticity component are separated from the contacting step, and it is dissolved in a dilute acid, and the dissolution thereof is performed. Since the sludge can be aggregated by adding the liquid to the organic sludge, it can be easily separated or treated.
本発明の作用原理を図面を参照しながら説明する。The operation principle of the present invention will be described with reference to the drawings.
第１図は、し尿の処理に本発明を適用した場合であつ
て、その処理を模式図的にフローシートで示している。FIG. 1 shows a case where the present invention is applied to the treatment of human waste, and the treatment is schematically shown by a flow sheet.
除渣し尿１を、無希釈で生物学的硝化脱窒素処理工程２
で生物処理し、この工程から出る活性汚泥スラリー３を
固液分離工程４に送り、ここで分離された例えば色度20
00〜2500度の生物処理水５を、キトサン粒子を充填した
吸着塔６に上向流もしくは下向流で通水させると、生物
処理水中の色度成分がキトサン粒子に吸着される。この
ことは、カニ殻から採取した粒径２〜4mmのキトサン粒
子を用いる試験によつて実験的に確認された。この吸着
塔６における生物処理水の空間速度としては１〜２が好
適であるが、勿論その前後を採用してもよく、吸着のさ
いにおける生物処理水のpHは、３〜７、好ましくは４〜
５の弱酸性域とするのがよい。また、吸着塔６は、充填
層（固定層）形式でなく、流動層状態で操作しても良
い。Biological nitrification and denitrification treatment step 2 of the depleted urine 1 without dilution
Biological treatment with the activated sludge 3 sent from this step is sent to the solid-liquid separation step 4 where, for example, the chromaticity of 20
When the biologically treated water 5 at 00 to 2500 degrees is passed through the adsorption tower 6 filled with chitosan particles in an upward flow or a downward flow, the chromaticity component in the biologically treated water is adsorbed by the chitosan particles. This has been confirmed experimentally by tests using chitosan particles with a particle size of 2-4 mm taken from crab shells. The space velocity of the biologically treated water in the adsorption tower 6 is preferably 1-2, but of course, the space velocity before and after the adsorption may be adopted, and the pH of the biologically treated water at the time of adsorption is 3-7, preferably 4 ~
It is recommended to set it to a weakly acidic range of 5. Further, the adsorption tower 6 may be operated in a fluidized bed state instead of the packed bed (fixed bed) type.
しかして、この吸着により色度が著しく低下した吸着処
理水７が得られ、必要に応じ、PO4 3-イオンの除去を行
つた後、放流される。そのさい、場何によつては、さら
に活性炭処理などをしてもよい。As a result, the adsorption-treated water 7 whose chromaticity is remarkably lowered is obtained by this adsorption, and if necessary, the PO 4 3− ions are removed and then discharged. At that time, activated carbon treatment may be further performed depending on the situation.
吸着塔６に生物処理水５を通水するにつれ、キトサン粒
子の色度吸着容量が飽和に達してくるので、その時点
で、吸着塔６からキトサン粒子を取り出し、取り出され
たキトサン粒子８をキトサン溶解槽９に移送し、酢酸、
希塩酸などの酸性水溶液10を添加して溶解し、キトサン
ポリマーの水溶液14とする。As the biologically treated water 5 is passed through the adsorption tower 6, the chromaticity adsorption capacity of the chitosan particles reaches a saturation level. Transfer to the dissolution tank 9, acetic acid,
An acidic aqueous solution 10 such as dilute hydrochloric acid is added and dissolved to obtain an aqueous solution 14 of chitosan polymer.
次に、固液分離工程４からの活性汚泥11の大部分を返送
汚泥12として処理工程２へ戻し、残りの余剰汚泥13にキ
トサン溶液14を添加し、攪拌凝集槽15内で攪拌すると、
カチオン性の荷電をもつキトサンポリマーの作用によつ
て、汚泥が速やかに、かつ大粒径に凝集し、脱水性が著
しく改善される。この凝集汚泥を含むスラリー16はベル
トプレスなどの脱水機17で脱水され、ケーキ18と脱水分
離水19に分離される。脱水分離水19は有機成分を含むの
で生物学的硝化脱窒素工程２へ入れられる。Next, most of the activated sludge 11 from the solid-liquid separation step 4 is returned to the treatment step 2 as return sludge 12, the chitosan solution 14 is added to the remaining excess sludge 13, and the mixture is stirred in the stirring coagulation tank 15.
Due to the action of the chitosan polymer having a cationic charge, the sludge rapidly aggregates into a large particle size, and the dehydration property is remarkably improved. The slurry 16 containing the coagulated sludge is dehydrated by a dehydrator 17 such as a belt press and separated into a cake 18 and dehydrated separated water 19. Since the dehydrated separated water 19 contains an organic component, it is put into the biological nitrification and denitrification step 2.
本発明では、汚水中の色度成分がキトサン粒子の表面に
吸着されて除去される。In the present invention, the chromaticity component in the waste water is adsorbed on the surface of the chitosan particles and removed.
また、本発明における処理において極めて興味深いこと
には、吸着塔６で色度成分を吸着したキトサン粒子を取
り出してキトサン溶解槽９で溶解すると、吸着されてい
た色度成分が溶解するが、この溶出色度成分は、汚泥の
凝集工程において凝集フロツクにとりこまれ、脱水ケー
キ18として系外に排出され、汚泥脱水分離水19には色度
成分はほとんど移行しないことが判明した。Further, what is extremely interesting in the process of the present invention is that when the chitosan particles having the chromaticity component adsorbed in the adsorption tower 6 are taken out and dissolved in the chitosan dissolution tank 9, the adsorbed chromaticity component is dissolved. It was found that the chromaticity component was taken into the floc in the flocculation step in the sludge flocculation process and was discharged outside the system as the dehydrated cake 18, and the chromaticity component hardly migrated to the sludge dewatered separated water 19.
したがつて、色度成分の系内での愛循環はおきないとい
う新知見が確認された。Therefore, a new finding was confirmed that there is no love cycle in the system of chromaticity components.
以下、実施例によつて本発明を具体的に説明する。ただ
し、本発明はこの実施例のみに限定されるものではな
い。Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to this embodiment.
実施例 し尿を無希釈硝化脱窒素処理し、この処理から流出する
活性汚泥スラリーを分画分子量10万の限外濾過膜で固液
分離して得られた、色度2600°、pH7.8、ss 0mg/lの膜
透過水に、キトサン粒子粉末（共和油脂（株）製品、商
品名「フローナツク」）を第１表に示す添加量で添加
し、100rpmのレシプロ振とう器で18時間攪拌した後、N
o.5A濾紙で濾過してキトサン粒子を分離し、得られた濾
液の色度を測定した。その結果を第１表に示す。Example Human urine was subjected to undiluted nitrification denitrification treatment, and the activated sludge slurry flowing out from this treatment was obtained by solid-liquid separation with an ultrafiltration membrane having a molecular weight cutoff of 100,000, chromaticity 2600 °, pH 7.8, Chitosan particle powder (Kyowa Yushi Co., Ltd., trade name "FLOWNATKU") was added to ss 0 mg / l membrane-permeated water at the addition amount shown in Table 1 and stirred for 18 hours with a 100 rpm reciprocal shaker. After, N
The chitosan particles were separated by filtering with o.5A filter paper, and the chromaticity of the obtained filtrate was measured. The results are shown in Table 1.
第１表によれば、キトサン粒子による生物処理水の色度
成分の吸着は、キトサン粒子添加率2000〜4000mg/l、pH
3.5〜4.8の処理条件において、色度除去率が最良となる
ことが認められた。 According to Table 1, the adsorption of the chromaticity component of the biologically treated water by the chitosan particles is determined by the chitosan particle addition rate of 2000 to 4000 mg / l, pH.
It was found that the chromaticity removal rate was the best under the treatment conditions of 3.5 to 4.8.
次に、第１表のキトサン添加率2000mg/l、吸着処理時pH
4.8で処理した実験No.5の色度吸着後のキトサン粒子を
取り出し、酢酸を添加して溶解し、0.2％濃度のキトサ
ン溶液を調製し、この溶液を前記のし尿の生物学的硝化
脱窒素処理工程から発生した余剰活性汚泥（汚泥ss濃度
2.1％）に添加した。キトサンの添加率は、汚泥固形物
当り1.5％とした。すなわち、その添加量は汚泥1g当り1
5mgである。Next, the chitosan addition rate in Table 1 is 2000 mg / l, pH during adsorption treatment
The chitosan particles after adsorption of the chromaticity of Experiment No. 5 treated in 4.8 were taken out and dissolved by adding acetic acid to prepare a 0.2% concentration chitosan solution. Excess activated sludge generated from the treatment process (sludge ss concentration
2.1%). The addition rate of chitosan was 1.5% per sludge solids. That is, the addition amount is 1 per 1 g of sludge.
It is 5 mg.
この結果、余剰活性汚泥は非常に良好な凝集フロツクを
形成し、ベルトプレス脱水機で容易に脱水され、ケーキ
水分82％の脱水ケーキを得た。また、ベルトプレス脱水
分離液の色度は、200〜250°であり、新鮮なキトサン溶
液（色度未吸着のもの）を同一量添加したときと同等で
あつた。この色度の数値からみて、キトサン粒子に吸着
された色度成分は脱水分離液にほとんど入つていくこと
はないものとみられる。As a result, the surplus activated sludge formed a very good flocculation floc and was easily dehydrated by a belt press dehydrator to obtain a dehydrated cake having a cake water content of 82%. Further, the chromaticity of the belt press dehydrated separated liquid was 200 to 250 °, which was equivalent to that when the same amount of fresh chitosan solution (one without chromaticity adsorption) was added. From the chromaticity value, it is considered that the chromaticity component adsorbed on the chitosan particles hardly enters the dehydrated separated liquid.
本発明によれば、次のような顕著な効果を奏する。 According to the present invention, the following remarkable effects are exhibited.
（１）汚水中の色度成分が十分に除去される。(1) Chromaticity components in wastewater are sufficiently removed.
（２）色度成分を除去するのに無機凝集剤を使用しない
ので、離脱水性の凝集汚泥が発生しない。(2) Since an inorganic coagulant is not used to remove the chromaticity component, detached aqueous coagulated sludge is not generated.
（３）色度除去と汚泥の凝集という２つの効果をもつの
で色度除去用のランニングコストが活性炭吸着に比べて
安価である。(3) Since it has two effects of chromaticity removal and sludge agglomeration, the running cost for chromaticity removal is cheaper than activated carbon adsorption.
第１図は、し尿の処理に本発明を適用した場合の処理工
程を模式図によつて表わしたフローシートを示す。 １……除渣し尿、２……生物学的硝化脱窒素処理、３…
…活性汚泥スラリー、４……固液分離工程、５……生物
処理水、６……吸着塔、７……処理水、８……吸着飽和
キトサン粒子、９……キトサン溶解槽、13……余剰汚
泥、14……キトサン溶液、15……攪拌凝集槽。FIG. 1 shows a flow sheet in which the treatment steps when the present invention is applied to the treatment of human waste are represented by schematic diagrams. 1 ... Waste urine, 2 ... Biological nitrification and denitrification treatment, 3 ...
… Activated sludge slurry, 4 …… solid-liquid separation process, 5 …… biologically treated water, 6 …… adsorption tower, 7 …… treated water, 8 …… adsorbed saturated chitosan particles, 9 …… chitosan dissolution tank, 13 …… Excess sludge, 14 …… chitosan solution, 15 …… stirring coagulation tank.
Claims (1)
接触せしめて色度成分を吸着除去し、該色度成分を吸着
したキトサン粒子を、前記接触工程から分離し、酸性水
溶液に溶解し、この溶解液を有機性汚泥に添加して凝集
させることを特徴とする汚水・汚泥の処理方法。1. Sewage containing a chromaticity component is contacted with chitosan particles to adsorb and remove the chromaticity component, and the chitosan particles adsorbing the chromaticity component are separated from the contacting step and dissolved in an acidic aqueous solution. A method for treating sewage / sludge, which comprises adding the dissolved solution to organic sludge to cause coagulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63292284A JPH0722748B2 (en) | 1988-11-21 | 1988-11-21 | Sewage and sludge treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63292284A JPH0722748B2 (en) | 1988-11-21 | 1988-11-21 | Sewage and sludge treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02139090A JPH02139090A (en) | 1990-05-29 |
| JPH0722748B2 true JPH0722748B2 (en) | 1995-03-15 |
Family
ID=17779762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63292284A Expired - Lifetime JPH0722748B2 (en) | 1988-11-21 | 1988-11-21 | Sewage and sludge treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722748B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100893934B1 (en) * | 2007-08-30 | 2009-04-20 | 주식회사 성우지오텍 | Environment-friendly household sewage sludge and its manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100824596B1 (en) * | 2006-07-10 | 2008-04-24 | (주)그린유화 | Manufacturing Method of Natural Emulsion Defoamer Using Chitosan and Germanium Composite |
-
1988
- 1988-11-21 JP JP63292284A patent/JPH0722748B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100893934B1 (en) * | 2007-08-30 | 2009-04-20 | 주식회사 성우지오텍 | Environment-friendly household sewage sludge and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02139090A (en) | 1990-05-29 |
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