WO2006057287A1 - Inhibitor for active sludge formation - Google Patents

Inhibitor for active sludge formation Download PDF

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Publication number
WO2006057287A1
WO2006057287A1 PCT/JP2005/021560 JP2005021560W WO2006057287A1 WO 2006057287 A1 WO2006057287 A1 WO 2006057287A1 JP 2005021560 W JP2005021560 W JP 2005021560W WO 2006057287 A1 WO2006057287 A1 WO 2006057287A1
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Prior art keywords
activated sludge
production inhibitor
inhibitor
sewage
shell
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PCT/JP2005/021560
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French (fr)
Japanese (ja)
Inventor
Toshiaki Kusu
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Toshiaki Kusu
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Application filed by Toshiaki Kusu filed Critical Toshiaki Kusu
Priority to JP2006520552A priority Critical patent/JP4390804B2/en
Publication of WO2006057287A1 publication Critical patent/WO2006057287A1/en

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/12Activated sludge processes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to an activated sludge production inhibitor suitable for use in an activated sludge method for treating organic sewage and wastewater, and a sewage treatment method using the same.
  • the activated sludge method is used as a method for treating sewage such as sewage, drainage from agricultural settlements, and drainage from various factories.
  • activated sludge composed of mixed microorganisms such as bacteria and micro-animals is aerated and stirred in an aeration tank, and the influent organic wastewater is aerobically treated by the mixed microorganisms and precipitated.
  • This is a method of obtaining normal supernatant water as treated water by solid-liquid separation in a pond.
  • Total oxidation activated sludge method that increases the residence time of activated sludge in the treatment system, promotes decomposition of organic matter and auto-oxidation of microorganisms, and reduces the amount of activated sludge produced;
  • the activated sludge produced by the above activated sludge method is concentrated, then gasified by anaerobic fermentation, incinerated after dehydration, or auto-digested under aerobic conditions (aerobic disinfection) (Or composting) to further reduce the amount.
  • Patent Document 1 Japanese Patent Laid-Open No. 2002-263671
  • the gist of the present invention is as follows:
  • FIG. 2 is a schematic view showing an apparatus used in Example 3 of the present invention.
  • the seashell used in the present invention may be any seashell, freshwater or brackish shellfish, for example, oysters, clams, oysters, oysters, mussels, abalone, bai, sazae, scallops, tiger oysters, Shells such as akagai are listed. These may be used alone or in combination of two or more. Among these, hard shells are preferable from the viewpoint of being readily available in large quantities.
  • the crushed shell obtained is in a state where the shell does not substantially retain its original shape.
  • the powder is powdery, and the maximum diameter is 1000 m or less, more preferably 500 m or less, and more preferably 125 m or less. Yes.
  • the "organic substance” refers to an organic substance usually contained in the shell, and examples thereof include collagen, elastin, keratin, and fib mouth-in.
  • the content of the shell or its crushed material in the activated sludge production inhibitor of the present invention is not particularly limited as long as a desired effect is obtained, but is preferably 80 to 100% by weight, more preferably 90 to 100% by weight. More preferably, it is 95 to 100% by weight.
  • the size is preferably 5 to 50 mm ⁇ , more preferably 25, from the viewpoint of controlling the dissolution rate of the activated sludge production inhibitor itself. ⁇ 50mm ⁇ .
  • Examples of the method for forming the activated sludge production inhibitor of the present invention into a lump form include, for example, an inorganic binder such as water glass and cement, a bull acetate-based resin, an epoxy resin, or the like on the shell or its crushed material.
  • Examples include a method of adding an organic binder such as a fat-based adhesive and water, kneading with a jar, etc., forming into a desired shape and drying.
  • the amount of the inorganic or organic binder and water added is within the range where the effects of the present invention are not hindered, and is not particularly limited as long as it can be molded into a lump.
  • the inorganic binder is preferably 4 to 10% by weight, more preferably 4 to 6% by weight in the inhibitor of the present invention.
  • water is preferably 1 to 4% by weight, more preferably 1 to 2% by weight.
  • the activated sludge production inhibitor of the present invention may further contain additives depending on various purposes as long as the effects of the present invention are not impaired.
  • the activated sludge production inhibitor of the present invention contains a baked shell or a crushed product thereof.
  • the organic matter contained in the shell or its crushed material can be removed, the accumulation of excess organic matter in the sewage treatment tank can be prevented, and the inorganic material contained in the shell or its crushed material can be prevented. The effect of improving the solubility of the components is achieved.
  • the calcination can be carried out using an apparatus such as a rotary kiln, a fixed bed incinerator, a fluidized bed incinerator or the like.
  • This aspect is the same as the first aspect, except that a baked shell or its pulverized material is used instead of the shell from which organic matter has been removed or its pulverized material.
  • the present invention further provides a method for treating sewage using the activated sludge production inhibitor obtained as described above.
  • the sewage to be treated is not particularly limited, however, sewage, drainage from agricultural settlements, various food and beverage factories and factory drainage from organic wastewater are preferable.
  • the amount of activated sludge production inhibitor used is appropriately set depending on the amount and concentration of sewage to be treated, but for domestic sewage 1000 L / day sewage continuous treatment equipment. Preferably 5 to 20 kg, more preferably 10 to 20 kg is used. In addition, for the continuous wastewater treatment equipment for industrial wastewater, the amount of activated sludge production inhibitor used is 3 to 5 times the total amount of activated sludge (dry weight), more preferably 4 to 5 times.
  • examples of the solution supplied to the tank in which the activated sludge production inhibitor is installed include tap water and treated sewage. And so on.
  • the solution supply rate to the installation tank and the solution introduction speed to the aeration tank vary depending on the capacity of the installation tank, it cannot be said unconditionally.
  • the concentration of activated sludge in the aeration tank does not decrease excessively, and From the viewpoint of efficient elution, it is preferable that the supply start force of the solution to the installation tank is 24 hours or less, more preferably 12 hours or less until the start of introduction into the aeration layer.
  • This embodiment is preferable because the elution rate of the activated sludge production inhibitor of the present invention can be easily measured and the problem of clogging with contaminants does not occur as compared with the case where it is immersed in an aeration tank.
  • Kneading was carried out by mixing 100 kg of cell force (by Isobe Sangyo Co., Ltd.), 4.8 kg of water glass and 2 kg of water.
  • the obtained kneaded product was put into a spherical mold having a diameter of 45 mm and dried to prepare a spherical activated sludge production inhibitor having a diameter of 45 mm and a weight of 55 g / piece.
  • the detection limit in the above quantification method is 10 g / L or less'
  • Sewage treatment was performed using the equipment shown in Fig. 1.
  • Supplying 1 000 L / day of sewage 1 that is the drainage of residential complex power to aeration tank 3 (capacity: 1000 L) the concentration of activated sludge 2 obtained from the residential sewage treatment plant will be 2680 mg / L
  • the slag 6 in which 20 kg of the activated sludge production inhibitor 7 prepared in Example 1 was placed in the aeration tank 3 was suspended so that the activated sludge production inhibitor 7 was completely immersed in the sewage.
  • Sewage treatment was performed using the equipment shown in Fig. 2.
  • Sewage 1 which is the drainage of the residential complex, is supplied to the aeration tank 3 (capacity: 1000L) at 1 000 L / day, and the activated sludge 2 obtained from the residential sewage treatment plant is 2680 mg / L in the aeration tank. It supplied to the aeration tank 3 so that it might become. Thereafter, air is supplied from the blower 4 through the diffusion cylinder 5 at 30 L / min into the aeration tank 3, and tap water 9 is added to the tank 10 in which 20 kg of the activated sludge production inhibitor 7 prepared in Example 1 is arranged.
  • Sewage treatment was performed in the same manner as in Example 2 except that no activated sludge production inhibitor was used.
  • Comparative Example 2 Wastewater Treatment 2 Sewage treatment was performed in the same manner as in Example 3 except that no activated sludge production inhibitor was used.
  • Test Example 2 Water quality evaluation before and after sewage treatment
  • Examples 2 and 3 can obtain a sewage treatment efficiency equal to or higher than the sewage treatment efficiency of Comparative Examples 1 and 2.
  • the activated sludge production rate was calculated, in Example 2, after 1 kg of BOD was removed, an increase of 0.01 kg of activated sludge was observed, and in Comparative Example 1, after removing 1 kg of BOD, 0.44 kg An increase in activated sludge was observed. In other words, it is possible to suppress the generation of activated sludge to 1/10 or less by introducing the activated sludge production inhibitor into the aeration tank.
  • Example 3 an increase of 0.017 kg of activated sludge was observed after removal of 1 kg of BOD.
  • Comparative Example 2 an increase of 0.37 kg of activated sludge was observed after removal of 1 kg of BOD. It was seen.
  • the activated sludge generation inhibitor is not required to be directly put into the aeration tank. It can be seen that the production of activated sludge can be suppressed to 1/10 or less simply by supplying the solution brought into contact with the aeration tank during sewage treatment.
  • the wastewater from the bakery factory was implemented at the actual operation facility.
  • the outline of the facility is that the influent water volume is 70 to 100 m 3 / day, and the treatment flow sheet is as shown in Fig. 3.
  • a tank (capacity: 5000L) is installed near this facility, and approximately 3000kg of the activated sludge production inhibitor obtained in Example 1 is added, and approximately 500L / hour of treated water is discharged after the settling tank using a pump. Waterway force Water was continuously introduced and the water was injected into the aeration tank.
  • Table 3 shows the operating conditions before and after using the sludge production inhibitor and the sludge production rate.
  • the activated sludge production inhibitor of the present invention can be effectively used in the sewage treatment industry, and can be used for reducing the amount of waste associated with sewage treatment.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Activated Sludge Processes (AREA)
  • Treatment Of Biological Wastes In General (AREA)
  • Treatment Of Sludge (AREA)

Abstract

An inhibitor for active sludge formation containing shells or ground shells from which organic matters have been removed; an inhibitor for active sludge formation containing baked shells or ground baked shells; a method of treating sewage which comprises treating sewage in the presence of the inhibitor for active sludge formation as described above; and a method of treating sewage which comprises treating sewage with the use of a solution having been in contact with the inhibitor for active sludge formation as described above. Thus, it is possible to provide an inhibitor for active sludge formation whereby the formation of active sludge can be inhibited while maintaining a high treatment efficiency in treating sewage by the active sludge method; and a method of treating sewage by using the above-described inhibitor for active sludge formation whereby the formation of active sludge can be lessened and the treatment can be conducted at a high efficiency and a low cost.

Description

活性汚泥生成抑制剤  Activated sludge production inhibitor
技術分野  Technical field
[0001] 本発明は、有機性の汚水および排水などを処理する活性汚泥法に使用するのに 好適な活性汚泥生成抑制剤およびそれを用いた汚水の処理方法に関する。  [0001] The present invention relates to an activated sludge production inhibitor suitable for use in an activated sludge method for treating organic sewage and wastewater, and a sewage treatment method using the same.
背景技術  Background art
[0002] 一般的に、下水、農業集落力 の排水、各種工場力 の排水などの汚水を処理す る方法として活性汚泥法が使われている。この方法は、細菌類および微小動物など の混合微生物群から構成される活性汚泥を曝気槽にて曝気、撹拌し、流入させた有 機性排水を混合微生物群により好気的に処理し、沈殿池にて固液分離して正常な 上澄水を処理水として得る方法である。  [0002] In general, the activated sludge method is used as a method for treating sewage such as sewage, drainage from agricultural settlements, and drainage from various factories. In this method, activated sludge composed of mixed microorganisms such as bacteria and micro-animals is aerated and stirred in an aeration tank, and the influent organic wastewater is aerobically treated by the mixed microorganisms and precipitated. This is a method of obtaining normal supernatant water as treated water by solid-liquid separation in a pond.
[0003] 現状では、発生した活性汚泥の処分に多額の費用を要している。かかる問題を解 決するため、活性汚泥の減量方法として以下の方法:  [0003] Currently, a large amount of money is required to dispose of the generated activated sludge. To solve this problem, the following methods are used to reduce activated sludge:
[0004] (1)処理系統内における活性汚泥の滞留時間を長くして、有機物の分解および微生 物の自己酸化を促進させ、活性汚泥の生成量を少なくする全酸化活性汚泥法; [0004] (1) Total oxidation activated sludge method that increases the residence time of activated sludge in the treatment system, promotes decomposition of organic matter and auto-oxidation of microorganisms, and reduces the amount of activated sludge produced;
(2)返送汚泥をオゾンにて分解させ、活性汚泥を減量する活性汚泥減量法;(2) Activated sludge reduction method by decomposing the returned sludge with ozone and reducing the activated sludge;
(3)返送汚泥の一部を破砕機により破砕し、これを活性汚泥により分解させ、活性汚 泥を減量する活性汚泥減量法; (3) An activated sludge reduction method in which part of the returned sludge is crushed by a crusher, decomposed with activated sludge, and the activated sludge is reduced;
(4)植物抽出物質、各種ビタミン剤、ミネラル類等を含む薬剤を曝気槽に定期的に投 入し、活性汚泥の自己消化率を高めて活性汚泥を減量する活性汚泥減量法;など が知られている。  (4) Active sludge reduction method in which chemicals containing plant extracts, various vitamins, minerals, etc. are regularly injected into the aeration tank to increase the self-digestion rate of activated sludge and reduce the activated sludge. It has been.
[0005] 上記活性汚泥法により生成した活性汚泥は、濃縮後、嫌気性醱酵によりガス化され るか、脱水後焼却されるか、または好気的条件下で自己消化 (好気性消ィ匕もしくはコ ンポスト化)させることにより、さらに減量される。  [0005] The activated sludge produced by the above activated sludge method is concentrated, then gasified by anaerobic fermentation, incinerated after dehydration, or auto-digested under aerobic conditions (aerobic disinfection) (Or composting) to further reduce the amount.
[0006] ところで、力キ殻を利用した汚水処理方法として、微生物増殖用担体 (力キ殻を破 砕したものと木炭を混ぜたもの)に付着した活性汚泥により汚水を浄ィ匕する方法 (例 えば、特許文献 1参照)、貝殻 (カキ殻)の微粉末を巾布や紐へ添着させたものを、汚 水に浸漬して汚水中のリン酸イオンを貝殻微粉末に付着させてリン酸イオンを除去 する方法 (例えば、特許文献 2参照)などが報告されて ヽる。 [0006] By the way, as a method for treating sewage using power husks, a method of purifying sewage with activated sludge adhering to a carrier for microbial growth (a mixture of crushed husks and charcoal) ( For example, refer to Patent Document 1), a powder of shellfish (oyster shell) that is attached to a drawstring or string, There has been reported a method for removing phosphate ions by immersing them in water and attaching phosphate ions in sewage to shell powder (see, for example, Patent Document 2).
特許文献 1:特開 2002— 263671号公報  Patent Document 1: Japanese Patent Laid-Open No. 2002-263671
特許文献 2 :特開平 11 138153号公報  Patent Document 2: JP-A-11 138153
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0007] し力しながら、上記の活性汚泥の減量方法のうち、(1)または (4)については、活性 汚泥の減量効果は約 20〜40%であり、十分な減量効果は得られていない。一方、( 2)または(3)については、減量効果は約 80〜: L00%であり、十分な減量効果が得ら れているものの、設備費および運転管理費に多額の費用を要し、ライフサイクルコス トを考慮すると、経済的なメリットはほとんどな 、。  [0007] Among the methods for reducing activated sludge described above, however, (1) or (4) shows that the activated sludge reduction effect is about 20 to 40%, and a sufficient reduction effect is obtained. Absent. On the other hand, for (2) or (3), the weight loss effect is about 80-: L00%, and although a sufficient weight loss effect is obtained, a large amount of equipment costs and operation management costs are required. Considering the life cycle cost, there is almost no economic merit.
[0008] 一方、汚水処理に前記微生物増殖用担体を用いる場合においては、処理対象汚 水の濃度が高い場合、微生物増殖用担体に活性汚泥が付着しやすぐ付着しすぎ た活性汚泥の内部が嫌気的になり、結果的に浄ィ匕効率が悪ィ匕することなどの問題が ある。  [0008] On the other hand, in the case of using the microbial growth carrier for sewage treatment, when the concentration of the sewage to be treated is high, the activated sludge adhered to the microbial growth carrier and the activated sludge that was too soon attached to There are problems such as becoming anaerobic and resulting in poor purification efficiency.
[0009] さらに、カキ殻の微粉末にリン酸イオンを付着させることにより汚水を処理する方法 において、リン酸イオンは多少除去されるものの、他の成分はほとんど除去されない ため、水の浄ィ匕法としての機能を果たすことは困難である。  [0009] Further, in the method of treating sewage by attaching phosphate ions to fine powder of oyster shell, although some phosphate ions are removed, other components are hardly removed. It is difficult to serve as a law.
[0010] 本発明はこのような事情に鑑みてなされたものであり、本発明の目的は、活性汚泥 法による汚水処理にお!ヽて優れた処理効率を維持したままで、活性汚泥の生成を抑 制できる活性汚泥生成抑制剤、および活性汚泥の生成が少なぐかつ優れた処理効 率を有し、さらに、低コストである、該活性汚泥生成抑制剤を用いた汚水の処理方法 を提供することである。  [0010] The present invention has been made in view of such circumstances, and an object of the present invention is to treat sewage by the activated sludge method! The activated sludge production inhibitor that can suppress the production of activated sludge while maintaining excellent treatment efficiency, and the production efficiency of the activated sludge is low, the treatment efficiency is low, and the cost is low. The present invention also provides a method for treating sewage using the activated sludge production inhibitor.
課題を解決するための手段  Means for solving the problem
[0011] すなわち、本発明の要旨は、  That is, the gist of the present invention is as follows:
(1)有機物を除去した貝殻またはその破砕物を含有してなる活性汚泥生成抑制剤、 (1) An activated sludge production inhibitor comprising a shell from which organic matter has been removed or a crushed product thereof,
(2)焼成された貝殻またはその破砕物を含有してなる活性汚泥生成抑制剤、(2) an activated sludge production inhibitor comprising a calcined shell or its crushed material,
(3)貝殻がカキ殻である、前記(1)または (2)記載の活性汚泥生成抑制剤、 (4)前記破砕物が粉状である前記(1)〜(3) V、ずれか記載の活性汚泥生成抑制剤、(3) The activated sludge production inhibitor according to (1) or (2) above, wherein the shell is an oyster shell, (4) The crushed material is in powder form (1) to (3) V, the activated sludge production inhibitor according to any one of the above,
(5)塊状に成形されてなる前記(1)〜 (4) V、ずれか記載の活性汚泥生成抑制剤、(5) The above-mentioned (1) to (4) V, which is formed into a lump, or the activated sludge production inhibitor according to any of the above,
(6)前記(1)〜(5) V、ずれか記載の活性汚泥生成抑制剤の存在下で汚水処理を行 う、汚水の処理方法、ならびに (6) In the presence of the activated sludge production inhibitor described in (1) to (5) V, above, sewage treatment, a sewage treatment method, and
(7)前記(1)〜(5) V、ずれか記載の活性汚泥生成抑制剤と接触させた溶液を用いて 汚水処理を行う、汚水の処理方法  (7) A method for treating sewage, wherein sewage treatment is performed using a solution brought into contact with the activated sludge production inhibitor described in (1) to (5) V above.
に関する。  About.
発明の効果  The invention's effect
[0012] 本発明の活性汚泥生成抑制剤によれば、貝殻成分、特にカキ殻成分の優れた溶 出速度が得られ、また、活性汚泥法による汚水処理において優れた処理効率を維持 したままで、汚水処理中の活性汚泥の生成を抑制することができるという効果が奏さ れる。さらに、本発明の汚水の処理方法によれば、処理効率に優れ、活性汚泥の生 成を抑制することができ、よって、低コストで汚水処理することができるという効果が奏 される。  [0012] According to the activated sludge production inhibitor of the present invention, an excellent dissolution rate of shell components, particularly oyster shell components, can be obtained, and excellent treatment efficiency can be maintained in sewage treatment by the activated sludge method. In addition, it is possible to suppress the generation of activated sludge during sewage treatment. Furthermore, according to the sewage treatment method of the present invention, the treatment efficiency is excellent, the production of activated sludge can be suppressed, and the sewage treatment can be performed at low cost.
図面の簡単な説明  Brief Description of Drawings
[0013] [図 1]本発明の実施例 2で使用する装置を示す概略図である。 FIG. 1 is a schematic view showing an apparatus used in Example 2 of the present invention.
[図 2]本発明の実施例 3で使用する装置を示す概略図である。  FIG. 2 is a schematic view showing an apparatus used in Example 3 of the present invention.
[図 3]本発明の実施例 4のフローシートを示す概略図である。  FIG. 3 is a schematic view showing a flow sheet of Example 4 of the present invention.
符号の説明  Explanation of symbols
[0014] 1 汚水 [0014] 1 Sewage
2 活性汚泥  2 Activated sludge
3 曝気槽  3 Aeration tank
4 ブロア一  4 Blower
5 散気筒  5 Spiral cylinder
6 活性汚泥生成抑制剤設置籠  6 Activated sludge production inhibitor
7 活性汚泥生成抑制剤  7 Activated sludge production inhibitor
8 沈殿槽  8 Settling tank
9 水道水 10活性汚泥生成抑制剤設置槽 9 Tap water 10 Activated sludge production inhibitor installation tank
11処理後の汚水  11 Wastewater after treatment
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0015] 本発明の第 1の局面において、本発明の活性汚泥生成抑制剤は、有機物を除去し た貝殻またはその破砕物を含有することを一つの大きな特徴とする。さらに、他の局 面では、本発明の活性汚泥生成抑制剤は、焼成された貝殻またはその破砕物を含 有することを一つの大きな特徴とする。  [0015] In the first aspect of the present invention, the activated sludge production inhibitor of the present invention is characterized by containing a shell from which organic substances have been removed or a crushed product thereof. Furthermore, in another aspect, the activated sludge production inhibitor of the present invention is characterized by containing a calcined shell or its crushed material.
[0016] 本発明は上記特徴を有していることにより、本発明の活性汚泥生成抑制剤の存在 下、または本発明の活性汚泥生成抑制剤と接触させた溶液を用いて汚水処理を行う 場合、優れた処理効率を維持しているにもかかわらず、意外にも、活性汚泥の生成 が有意に抑制されるという効果を奏する。  [0016] Since the present invention has the above-mentioned characteristics, when sewage treatment is performed in the presence of the activated sludge production inhibitor of the present invention or using a solution brought into contact with the activated sludge production inhibitor of the present invention. In spite of maintaining excellent treatment efficiency, the production of activated sludge is surprisingly suppressed.
[0017] 本発明に使用される貝殻は、海水、淡水または汽水に生息する貝のいずれの貝殻 でもよぐ例えば、ハマダリ、アサリ、ホツキガイ、カキ、ィガイ、ァヮビ、バイ、サザェ、 ホタテガイ、トリガイ、ァカガイなどの貝殻が挙げられる。これらは、単独で使用しても 、 2種以上併用してもよい。中でも、大量かつ容易に入手できる観点から、力キの貝 殻が好ましい。  [0017] The seashell used in the present invention may be any seashell, freshwater or brackish shellfish, for example, oysters, clams, oysters, oysters, mussels, abalone, bai, sazae, scallops, tiger oysters, Shells such as akagai are listed. These may be used alone or in combination of two or more. Among these, hard shells are preferable from the viewpoint of being readily available in large quantities.
[0018] 本発明に使用される貝殻の破砕物は、前記貝殻を粉砕ローラー、ロールプレスなど を用いて破砕処理することにより調製される。  [0018] The crushed shells used in the present invention are prepared by crushing the shells using a crushing roller, a roll press or the like.
[0019] 得られた貝殻の破砕物は、貝殻がその原形を実質的にとどめていない状態であれ ばよぐ貝殻からの成分の溶出性の向上および活性汚泥の過剰生成の抑制の観点 から、粉状であることが好ましぐ具体的には、その最大直径が 1000 m以下であるこ と力 子ましく、 500 m以下であることがより好ましぐ 125 m以下であることがさらに好 ましい。  [0019] From the viewpoints of improving the elution of components from the shell and suppressing the excessive production of activated sludge, the crushed shell obtained is in a state where the shell does not substantially retain its original shape. Specifically, it is preferable that the powder is powdery, and the maximum diameter is 1000 m or less, more preferably 500 m or less, and more preferably 125 m or less. Yes.
[0020] 本明細書において「有機物」とは、前記貝殻に通常含まれる有機物をいい、例えば 、コラーゲン、エラスチン、ケラチン、フイブ口インなどが挙げられる。  [0020] In the present specification, the "organic substance" refers to an organic substance usually contained in the shell, and examples thereof include collagen, elastin, keratin, and fib mouth-in.
[0021] 本明細書において「有機物を除去する」とは、有機物を貝殻から実質的に除去する ことをいい、「実質的に除去する」とは、貝殻における有機物濃度が好ましくは 2重量 %以下、より好ましくは 1重量%以下、さらに好ましくは 0.1重量%以下になるまで除去 することをいい、特に好ましくは完全に除去することである。なお、有機物濃度は灼熱 減量を指標として測定することができる。有機物を除去することにより、汚水処理槽に おける余剰な有機物の堆積が防止され得、さらに貝殻またはその粉砕物に含まれる 無機成分の溶出性が向上する。 [0021] In the present specification, "removing organic matter" means substantially removing organic matter from the shell, and "substantially removing" means that the organic matter concentration in the shell is preferably 2% by weight or less. More preferably 1% by weight or less, and even more preferably 0.1% by weight or less. It is particularly preferable to remove completely. The organic matter concentration can be measured using the loss on ignition as an index. By removing the organic matter, accumulation of excess organic matter in the sewage treatment tank can be prevented, and further, the elution of inorganic components contained in the shell or the pulverized product thereof is improved.
[0022] 貝殻から有機物を除去する方法としては、例えば、ロータリーキルンを用いて焼成 する方法、固定床式焼却炉、流動床式焼却炉などを用いて焼却する方法などが挙 げられる力 有機物を除去した貝殻を回収しやすい観点から、ロータリーキルンを用 V、て焼成する方法が好ま U、。  [0022] Examples of methods for removing organic substances from shells include a method of firing using a rotary kiln, a method of incineration using a fixed bed incinerator, a fluidized bed incinerator, etc. From the point of view of easy recovery of the shells used, a rotary kiln is preferred.
[0023] 本発明に使用される貝殻またはその破砕物は、上記のように調製してもよいが、セ ルカ(卜部産業社製)などの市販品を用いてもよい。  [0023] The shell or crushed material thereof used in the present invention may be prepared as described above, but a commercially available product such as SELKA (manufactured by Isobe Sangyo Co., Ltd.) may be used.
[0024] 本発明の活性汚泥生成抑制剤における貝殻またはその破砕物の含有量は、所望 の効果が得られれば特に限定されないが、好ましくは 80〜100重量%、より好ましくは 90〜100重量%、さらに好ましくは 95〜100重量%である。  [0024] The content of the shell or its crushed material in the activated sludge production inhibitor of the present invention is not particularly limited as long as a desired effect is obtained, but is preferably 80 to 100% by weight, more preferably 90 to 100% by weight. More preferably, it is 95 to 100% by weight.
[0025] 本発明の活性汚泥生成抑制剤は、取扱いの簡便さおよび効果のさらなる持続の観 点から、塊状の形態に成形されたものが好ましい。塊状とは、該抑制剤が塊となって いる状態をいい、その形としては、例えば、球状、三角錐状、四角錐状、三角柱状、 四角柱状などが挙げられる力 特に限定されない。中でも、貝殻またはその粉砕物に 含まれる無機成分の溶出速度を向上させる観点から、球状が好ましい。  [0025] The activated sludge production inhibitor of the present invention is preferably molded into a massive form from the viewpoint of easy handling and further sustaining of the effect. The lump shape refers to a state in which the inhibitor is agglomerated, and the shape is not particularly limited, for example, a force including a spherical shape, a triangular pyramid shape, a quadrangular pyramid shape, a triangular prism shape, a quadrangular prism shape, and the like. Among these, spherical shape is preferable from the viewpoint of improving the elution rate of the inorganic component contained in the shell or pulverized product thereof.
[0026] 本発明の活性汚泥生成抑制剤が球状の形態の場合、その大きさは、活性汚泥生 成抑制剤自体の溶解速度を制御する観点から、好ましくは 5〜50mm φ、より好ましく は 25〜50mm φである。  [0026] When the activated sludge production inhibitor of the present invention is in a spherical form, the size is preferably 5 to 50 mmφ, more preferably 25, from the viewpoint of controlling the dissolution rate of the activated sludge production inhibitor itself. ~ 50mm φ.
[0027] 本発明の活性汚泥生成抑制剤を塊状に成形する方法としては、例えば、前記貝殻 またはその破砕物に水ガラス、セメントなどの無機性結合剤または酢酸ビュル系榭脂 接着剤、エポキシ榭脂系接着剤などの有機性結合剤および水を添加して-一ダー などで練り、所望の形状に成形して乾燥する方法などが挙げられる。添加される無機 性結合剤または有機性結合剤および水の量は、本発明の効果が阻害されな 、範囲 内であり、塊状に成形できるのであれば特に限定されない。例えば、無機結合剤に ついては、本発明の抑制剤中、好ましくは 4〜10重量%、より好ましくは 4〜6重量% であり、水については、本発明の抑制剤中、好ましくは 1〜4重量%、より好ましくは 1 〜2重量%である。 [0027] Examples of the method for forming the activated sludge production inhibitor of the present invention into a lump form include, for example, an inorganic binder such as water glass and cement, a bull acetate-based resin, an epoxy resin, or the like on the shell or its crushed material. Examples include a method of adding an organic binder such as a fat-based adhesive and water, kneading with a jar, etc., forming into a desired shape and drying. The amount of the inorganic or organic binder and water added is within the range where the effects of the present invention are not hindered, and is not particularly limited as long as it can be molded into a lump. For example, the inorganic binder is preferably 4 to 10% by weight, more preferably 4 to 6% by weight in the inhibitor of the present invention. In the inhibitor of the present invention, water is preferably 1 to 4% by weight, more preferably 1 to 2% by weight.
[0028] なお、本発明の活性汚泥生成抑制剤は、本発明の効果を損なわな 、範囲であれ ば、適宜、各種の目的に応じて添加剤をさらに含有してもよい。  [0028] It should be noted that the activated sludge production inhibitor of the present invention may further contain additives depending on various purposes as long as the effects of the present invention are not impaired.
[0029] 本発明の第 2の局面において、本発明の活性汚泥生成抑制剤は、焼成された貝殻 またはその破砕物を含有する。焼成された貝殻またはその破砕物を用いることにより 、貝殻またはその破砕物に含まれる有機物が除去され、汚水処理槽における余剰な 有機物の堆積が防止され得、さらに貝殻またはその粉砕物に含まれる無機成分の溶 出性が向上するという効果が奏される。  [0029] In the second aspect of the present invention, the activated sludge production inhibitor of the present invention contains a baked shell or a crushed product thereof. By using the baked shell or its crushed material, the organic matter contained in the shell or its crushed material can be removed, the accumulation of excess organic matter in the sewage treatment tank can be prevented, and the inorganic material contained in the shell or its crushed material can be prevented. The effect of improving the solubility of the components is achieved.
[0030] 焼成は、例えば、ロータリーキルン、固定床式焼却炉、流動床式焼却炉などの装置 を用いて実施することができる。  [0030] The calcination can be carried out using an apparatus such as a rotary kiln, a fixed bed incinerator, a fluidized bed incinerator or the like.
[0031] 貝殻またはその粉砕物を焼成する条件は、焼成後の貝殻またはその粉砕物におけ る有機物濃度が好ましくは 1重量%以下、より好ましくは 0.1重量%以下、さらに好まし くは 0.01重量%以下になるような条件であることが望ましぐ特に好ましくは、貝殻また はその粉砕物に含まれる有機物が完全に除去されるような条件である。なお、有機 物量は、第 1の局面と同様にして測定することができる。  [0031] The conditions for firing the shell or ground product thereof are such that the organic concentration in the shell or ground product after firing is preferably 1% by weight or less, more preferably 0.1% by weight or less, and even more preferably 0.01% by weight. It is particularly desirable that the conditions are such that the organic matter contained in the shell or its pulverized product is completely removed. The amount of organic matter can be measured in the same manner as in the first aspect.
[0032] 本局面は、有機物を除去した貝殻またはその粉砕物の代わりに焼成された貝殻ま たはその粉砕物を用いる以外は、第 1の局面と同様である。  [0032] This aspect is the same as the first aspect, except that a baked shell or its pulverized material is used instead of the shell from which organic matter has been removed or its pulverized material.
[0033] 本発明はさらに、以上のように得られた活性汚泥生成抑制剤を使用して汚水を処 理する方法を提供する。なお、処理する汚水は、特に限定されないが、下水、農業集 落力もの排水、各種飲食品系工場および有機性排水を排出する工場力もの排水な どが好ましい。  [0033] The present invention further provides a method for treating sewage using the activated sludge production inhibitor obtained as described above. The sewage to be treated is not particularly limited, however, sewage, drainage from agricultural settlements, various food and beverage factories and factory drainage from organic wastewater are preferable.
[0034] 汚水を処理する方法において、活性汚泥生成抑制剤の使用量は処理するべき汚 水の量および濃度などにより適宜設定されるが、生活系汚水 1000L/日の汚水連続 処理装置に対して好ましくは 5〜20kg、より好ましくは 10〜20kg使用される。また、ェ 場排水の排水連続処理装置については、活性汚泥生成抑制剤の使用量は、全活 性汚泥量(乾燥重量)の 3〜5倍量、より好ましくは 4〜5倍量である。  [0034] In the method for treating sewage, the amount of activated sludge production inhibitor used is appropriately set depending on the amount and concentration of sewage to be treated, but for domestic sewage 1000 L / day sewage continuous treatment equipment. Preferably 5 to 20 kg, more preferably 10 to 20 kg is used. In addition, for the continuous wastewater treatment equipment for industrial wastewater, the amount of activated sludge production inhibitor used is 3 to 5 times the total amount of activated sludge (dry weight), more preferably 4 to 5 times.
[0035] 活性汚泥生成抑制剤を曝気槽に投入することにより汚泥の生成が抑制され、ある いは、曝気槽とは別の槽に活性汚泥生成抑制剤を設置し、該槽に溶液を供給し、該 槽を通過、即ち活性汚泥生成抑制剤と接触した溶液を曝気槽に導入することにより 活性汚泥の生成が抑制される。 [0035] By introducing an activated sludge production inhibitor into the aeration tank, the production of sludge is suppressed. Or, install the activated sludge production inhibitor in a tank different from the aeration tank, supply the solution to the tank, and introduce the solution that has passed through the tank, that is, in contact with the activated sludge production inhibitor, into the aeration tank. This suppresses the generation of activated sludge.
[0036] 後者の場合にぉ 、て、活性汚泥生成抑制剤が設置された槽 (以下、単に設置槽と いう場合がある)に供給される溶液としては、例えば、水道水、処理された汚水などが 挙げられる。設置槽への溶液の供給速度および曝気槽への溶液の導入速度は、設 置槽の容量によって異なるので一概にはいえないが、曝気槽の活性汚泥の濃度を 低下させすぎず、かつ成分の溶出を効率よく行う観点から、好ましくは溶液の設置槽 への供給開始力 曝気層への導入開始まで 24時間以下であるような速度、より好ま しくは 12時間以下であるような速度である。かかる態様は、本発明の活性汚泥生成抑 制剤の溶出速度が容易に測定でき、かつ曝気槽へ浸漬する場合と比較して夾雑物 による詰まりの問題が発生しな 、ので好ま 、。  [0036] In the latter case, examples of the solution supplied to the tank in which the activated sludge production inhibitor is installed (hereinafter sometimes simply referred to as the installation tank) include tap water and treated sewage. And so on. Although the solution supply rate to the installation tank and the solution introduction speed to the aeration tank vary depending on the capacity of the installation tank, it cannot be said unconditionally. However, the concentration of activated sludge in the aeration tank does not decrease excessively, and From the viewpoint of efficient elution, it is preferable that the supply start force of the solution to the installation tank is 24 hours or less, more preferably 12 hours or less until the start of introduction into the aeration layer. This embodiment is preferable because the elution rate of the activated sludge production inhibitor of the present invention can be easily measured and the problem of clogging with contaminants does not occur as compared with the case where it is immersed in an aeration tank.
実施例  Example
[0037] 本発明を、実施例によりさらに詳細に説明するが、本発明は、かかる実施例のみに 限定されるものではない。  [0037] The present invention will be described in more detail with reference to examples, but the present invention is not limited to such examples.
[0038] 実施例 1 活性汚泥生成抑制剤の調製 [0038] Example 1 Preparation of an activated sludge production inhibitor
セル力(卜部産業社製)を 100kg、水ガラスを 4.8kgおよび水を 2kg混合して練った。 得られた混練物を直径 45mmの球状の型に入れて乾燥させ、直径 45mmで重さ 55g/ 個の球状の活性汚泥生成抑制剤を調製した。  Kneading was carried out by mixing 100 kg of cell force (by Isobe Sangyo Co., Ltd.), 4.8 kg of water glass and 2 kg of water. The obtained kneaded product was put into a spherical mold having a diameter of 45 mm and dried to prepare a spherical activated sludge production inhibitor having a diameter of 45 mm and a weight of 55 g / piece.
[0039] 試験例 1 抑制剤からの無機成分の溶出 [0039] Test Example 1 Elution of inorganic components from inhibitor
実施例 1で得られた活性汚泥生成抑制剤 18.2gを 100mlのイオン交換水に浸漬させ 18.2 g of the activated sludge production inhibitor obtained in Example 1 was immersed in 100 ml of ion-exchanged water.
、 20°Cにて 14日間静置した。一方、カキ殻そのもの 74.8gを 400mlのイオン交換水に浸 漬させ、 20°Cにて 14日間静置した。浸漬後のイオン交換水中のカルシウム、ホウ素お よび銅を定量し、その結果を表 1に示す。 And left at 20 ° C for 14 days. On the other hand, 74.8 g of oyster shell itself was soaked in 400 ml of ion-exchanged water and allowed to stand at 20 ° C. for 14 days. Table 1 shows the results of quantification of calcium, boron and copper in ion-exchanged water after immersion.
[0040] なお、カルシウム、ホウ素および銅の溶出量は、高周波プラズマ分光分析装置 (セ イコー電子工業社製: SPS1200VR)を用いて測定した。 [0040] The elution amounts of calcium, boron and copper were measured using a high-frequency plasma spectroscopic analyzer (manufactured by Seiko Denshi Kogyo Co., Ltd .: SPS1200VR).
[0041] [表 1] 溶出量'' ( w g/e) [0041] [Table 1] Elution volume '' (wg / e)
カルシウム ホウ素 銅  Calcium boron copper
活性汚泥生成抑制剤 453 1. 3 1. 6 カキ殻そのもの 2. 75 0. 43 ND" Activated sludge production inhibitor 453 1. 3 1. 6 Oyster shell itself 2. 75 0. 43 ND "
*1 :活性汚泥生成抑制剤およびカキ殻そのもの i s あたりの各無機成分の浴出量 である。 * 1: The amount of each inorganic component in the bath per activated sludge inhibitor and oyster shell itself.
:上記定量方法における検出限界は 10 g/L以下である'  : The detection limit in the above quantification method is 10 g / L or less'
[0042] 表 1の結果より、カルシウムでは約 165倍、ホウ素では約 3倍、活性汚泥生成抑制剤 の方が早く溶出することがわかる。 [0042] From the results in Table 1, it can be seen that the activated sludge production inhibitor elutes earlier by about 165 times for calcium and about 3 times for boron.
[0043] 実施例 2 汚水処理 1  [0043] Example 2 Wastewater treatment 1
図 1に示す装置を用いて汚水処理を行った。住宅団地力 の排水である汚水 1を 1 000L/日を曝気槽 3 (容量: 1000L)に供給し、住宅団地汚水処理場から入手した活性 汚泥 2を曝気槽中の濃度が 2680mg/Lとなるように曝気槽 3に投入した。さらに、曝気 槽 3に、実施例 1で調製した活性汚泥生成抑制剤 7を 20kg配置した籠 6を該活性汚 泥生成抑制剤 7が汚水に完全に浸漬するように吊り下げた。その後、ブロア一 4から 散気筒 5を介して 30L/分で空気を曝気槽 3内に供給して、 0.2kgBOD/1000い日の B OD負荷で汚水処理を行い、処理後の汚水 11を徐々に曝気槽 3に隣接する 240Lの 沈殿槽 8に移動させ、活性汚泥 2を沈殿させた。  Sewage treatment was performed using the equipment shown in Fig. 1. Supplying 1 000 L / day of sewage 1 that is the drainage of residential complex power to aeration tank 3 (capacity: 1000 L), the concentration of activated sludge 2 obtained from the residential sewage treatment plant will be 2680 mg / L As shown in FIG. Further, the slag 6 in which 20 kg of the activated sludge production inhibitor 7 prepared in Example 1 was placed in the aeration tank 3 was suspended so that the activated sludge production inhibitor 7 was completely immersed in the sewage. After that, air is supplied into the aeration tank 3 from the blower 4 through the diffusion cylinder 5 at 30 L / min, and sewage treatment is performed with a B OD load of 0.2 kgBOD / 1000 days, and the treated sewage 11 is gradually added. Then, it was moved to a 240 L sedimentation tank 8 adjacent to the aeration tank 3 to precipitate activated sludge 2.
[0044] 実施例 3 汚水処理 2  [0044] Example 3 Wastewater treatment 2
図 2に示す装置を用 、て汚水処理を行つた。住宅団地力 の排水である汚水 1を 1 000L/日で曝気槽 3 (容量: 1000L)に供給し、住宅団地汚水処理場から入手した活 性汚泥 2を曝気槽中の濃度が 2680mg/Lとなるように曝気槽 3に供給した。その後、ブ ロアー 4から散気筒 5を介して 30L/分で空気を曝気槽 3内に供給して、さらに実施例 1で調製した活性汚泥生成抑制剤 7を 20kg配置した槽 10に水道水 9を 0.01L/分で供 給し、槽 10を通過した水道水を 0.01L/分で曝気槽 3に導入しながら、 0.2kgBOD/100 0い日の BOD負荷で汚水処理を行った。処理後の汚水 11を徐々に曝気槽 3に隣接 する 240Lの沈殿槽 8に移動させ、活性汚泥 2を沈殿させた。  Sewage treatment was performed using the equipment shown in Fig. 2. Sewage 1, which is the drainage of the residential complex, is supplied to the aeration tank 3 (capacity: 1000L) at 1 000 L / day, and the activated sludge 2 obtained from the residential sewage treatment plant is 2680 mg / L in the aeration tank. It supplied to the aeration tank 3 so that it might become. Thereafter, air is supplied from the blower 4 through the diffusion cylinder 5 at 30 L / min into the aeration tank 3, and tap water 9 is added to the tank 10 in which 20 kg of the activated sludge production inhibitor 7 prepared in Example 1 is arranged. Was supplied at a rate of 0.01 L / min, and sewage treatment was performed with a BOD load of 0.2 kg BOD / 100 days while introducing tap water that passed through the tank 10 into the aeration tank 3 at 0.01 L / min. The treated sewage 11 was gradually moved to a 240 L settling tank 8 adjacent to the aeration tank 3 to precipitate activated sludge 2.
[0045] 比較例 1 汚水処理 1  [0045] Comparative Example 1 Sewage Treatment 1
活性汚泥生成抑制剤を使用しないことを除き実施例 2と同様に汚水処理を行った。  Sewage treatment was performed in the same manner as in Example 2 except that no activated sludge production inhibitor was used.
[0046] 比較例 2 汚水処理 2 活性汚泥生成抑制剤を使用しないことを除き実施例 3と同様に汚水処理を行った。 [0046] Comparative Example 2 Wastewater Treatment 2 Sewage treatment was performed in the same manner as in Example 3 except that no activated sludge production inhibitor was used.
[0047] 試験例 2 汚水処理前後の水質評価 [0047] Test Example 2 Water quality evaluation before and after sewage treatment
実施例 2および 3ならびに比較例 1および 2で処理した汚水について、処理前後の 透視度、 BOD、 CODおよび浮遊物を評価した。以下にその評価方法を示し、表 2に その結果を示す。  The sewage treated in Examples 2 and 3 and Comparative Examples 1 and 2 was evaluated for transparency, BOD, COD and suspended matter before and after treatment. The evaluation method is shown below, and the results are shown in Table 2.
•透視度  • Perspective
曰本下水道協会著、「下水試験方法」に記載する方法で測定した。  It measured by the method described in Enomoto Sewer Association, "sewage test method".
•BOD  • BOD
JISK0102 21に記載する方法で測定した。  It was measured by the method described in JISK0102 21.
•COD  • COD
JISK0102 17に記載する方法で測定した。  It was measured by the method described in JISK0102 17.
,浮遊物  , Float
JISK0102 14-1に記載する方法で測定した。  Measured by the method described in JISK0102 14-1.
[0048] [表 2] [0048] [Table 2]
Figure imgf000011_0001
Figure imgf000011_0001
[0049] 表 2の結果より、実施例 2および 3は比較例 1および 2の汚水の処理効率と同程度以 上の汚水処理効率が得られることがわかる。一方、活性汚泥生成率を算出すると、実 施例 2では、 1kgの BODを除去した後、 0.01kgの活性汚泥の増加が見られ、比較例 1 では、 1kgの BODを除去した後、 0.44kgの活性汚泥の増加が見られた。すなわち、曝 気槽に活性汚泥生成抑制剤を投入することにより、活性汚泥の生成を 1/10以下に抑 免ることができることがゎカゝる。 [0049] From the results in Table 2, it can be seen that Examples 2 and 3 can obtain a sewage treatment efficiency equal to or higher than the sewage treatment efficiency of Comparative Examples 1 and 2. On the other hand, when the activated sludge production rate was calculated, in Example 2, after 1 kg of BOD was removed, an increase of 0.01 kg of activated sludge was observed, and in Comparative Example 1, after removing 1 kg of BOD, 0.44 kg An increase in activated sludge was observed. In other words, it is possible to suppress the generation of activated sludge to 1/10 or less by introducing the activated sludge production inhibitor into the aeration tank.
[0050] また、実施例 3では、 1kgの BODを除去した後、 0.017kgの活性汚泥の増加が見られ 、比較例 2では、 1kgの BODを除去した後、 0.37kgの活性汚泥の増加が見られた。す なわち、曝気槽に活性汚泥生成抑制剤を直接投入しなくとも、活性汚泥生成抑制剤 と接触させた溶液を汚水処理中に曝気槽に供給するだけで、活性汚泥の生成を 1/1 0以下に抑えることができることがわかる。 [0050] In Example 3, an increase of 0.017 kg of activated sludge was observed after removal of 1 kg of BOD. In Comparative Example 2, an increase of 0.37 kg of activated sludge was observed after removal of 1 kg of BOD. It was seen. In other words, the activated sludge generation inhibitor is not required to be directly put into the aeration tank. It can be seen that the production of activated sludge can be suppressed to 1/10 or less simply by supplying the solution brought into contact with the aeration tank during sewage treatment.
[0051] 実施例 4 [0051] Example 4
製パン工場の排水について、実稼動施設で実施した。その施設の概要は、流入水 量は 70〜100m3/日であり、処理フローシートは図 3の通りである。この施設のそばに タンク (容量: 5000L)を設置し、約 3000kgの実施例 1で得られた活性汚泥生成抑制剤 を入れ、ポンプを用いて約 500 L/時の処理水を沈殿池後の水路力 連続的に導水 し、その水を曝気槽へ注入した。汚泥生成抑制剤使用前後の運転状況および汚泥 生成率を表 3に示す。 The wastewater from the bakery factory was implemented at the actual operation facility. The outline of the facility is that the influent water volume is 70 to 100 m 3 / day, and the treatment flow sheet is as shown in Fig. 3. A tank (capacity: 5000L) is installed near this facility, and approximately 3000kg of the activated sludge production inhibitor obtained in Example 1 is added, and approximately 500L / hour of treated water is discharged after the settling tank using a pump. Waterway force Water was continuously introduced and the water was injected into the aeration tank. Table 3 shows the operating conditions before and after using the sludge production inhibitor and the sludge production rate.
[0052] [表 3] [0052] [Table 3]
Figure imgf000012_0001
Figure imgf000012_0001
[0053] 表 3の結果より、活性汚泥生成抑制剤を使用することで、汚水処理の処理効率を維 持したままで、活性汚泥の生成を顕著に抑制することができた。 [0053] From the results in Table 3, by using the activated sludge production inhibitor, it was possible to remarkably inhibit the production of activated sludge while maintaining the treatment efficiency of the sewage treatment.
産業上の利用可能性  Industrial applicability
[0054] 本発明の活性汚泥生成抑制剤は、汚水処理産業に有効に利用することができ、汚 水処理に伴う廃棄物の減量のために利用することができる。  [0054] The activated sludge production inhibitor of the present invention can be effectively used in the sewage treatment industry, and can be used for reducing the amount of waste associated with sewage treatment.

Claims

請求の範囲 The scope of the claims
[1] 有機物を除去した貝殻またはその破砕物を含有してなる活性汚泥生成抑制剤。  [1] An activated sludge production inhibitor comprising a shell from which organic substances have been removed or a crushed product thereof.
[2] 焼成された貝殻またはその破砕物を含有してなる活性汚泥生成抑制剤。 [2] An activated sludge production inhibitor comprising a calcined shell or its crushed material.
[3] 貝殻がカキ殻である、請求項 1または 2記載の活性汚泥生成抑制剤。 [3] The activated sludge production inhibitor according to claim 1 or 2, wherein the shell is an oyster shell.
[4] 前記破砕物が粉状である請求項 1〜3いずれか記載の活性汚泥生成抑制剤。 [4] The activated sludge production inhibitor according to any one of claims 1 to 3, wherein the crushed material is powdery.
[5] 塊状に成形されてなる請求項 1〜4 、ずれか記載の活性汚泥生成抑制剤。 [5] The activated sludge production inhibitor according to any one of claims 1 to 4, which is formed into a lump shape.
[6] 請求項 1〜5いずれか記載の活性汚泥生成抑制剤の存在下で汚水処理を行う、汚 水の処理方法。 [6] A method for treating sewage, wherein sewage treatment is performed in the presence of the activated sludge production inhibitor according to any one of claims 1 to 5.
[7] 請求項 1〜5 、ずれか記載の活性汚泥生成抑制剤と接触させた溶液を用いて汚水 処理を行う、汚水の処理方法。  [7] A method for treating sewage, wherein sewage treatment is performed using a solution brought into contact with the activated sludge production inhibitor according to any one of claims 1 to 5.
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