JP5703509B2 - Wastewater dephosphorization and disinfectant, treatment method and treatment apparatus - Google Patents
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- 239000002351 wastewater Substances 0.000 title claims description 64
- 239000000645 desinfectant Substances 0.000 title claims description 51
- 238000000034 method Methods 0.000 title claims description 39
- 239000010802 sludge Substances 0.000 claims description 54
- 239000010865 sewage Substances 0.000 claims description 47
- 239000000378 calcium silicate Substances 0.000 claims description 38
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 38
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 37
- 239000011574 phosphorus Substances 0.000 claims description 37
- 229910052698 phosphorus Inorganic materials 0.000 claims description 37
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 36
- 239000011575 calcium Substances 0.000 claims description 35
- 238000004042 decolorization Methods 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 21
- 239000002244 precipitate Substances 0.000 claims description 20
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 19
- 239000004571 lime Substances 0.000 claims description 19
- 238000005273 aeration Methods 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 238000001556 precipitation Methods 0.000 claims description 13
- 238000004062 sedimentation Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 11
- 238000004659 sterilization and disinfection Methods 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 238000004065 wastewater treatment Methods 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 7
- 239000000920 calcium hydroxide Substances 0.000 claims description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 7
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- 238000002845 discoloration Methods 0.000 claims description 5
- 239000003337 fertilizer Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 238000004061 bleaching Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000006103 coloring component Substances 0.000 claims description 2
- 239000002562 thickening agent Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 26
- 238000002835 absorbance Methods 0.000 description 14
- 239000000523 sample Substances 0.000 description 11
- 244000144972 livestock Species 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000249 desinfective effect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- -1 calcium silicate hydrates Chemical class 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000009264 composting Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 210000003608 fece Anatomy 0.000 description 2
- 239000010871 livestock manure Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 229940085991 phosphate ion Drugs 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000710198 Foot-and-mouth disease virus Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Treatment Of Sludge (AREA)
- Fertilizers (AREA)
- Activated Sludge Processes (AREA)
- Removal Of Specific Substances (AREA)
Description
本発明は、畜産農業事業場から排出される有機汚水を活性汚泥法などの通常の処理施設で処理した後の排水、あるいは食品工場から排出される有機汚水を処理した後の排水などを対象とした、脱リン、脱色および消毒効果に優れた処理剤と処理方法および処理装置に関する。 The present invention is directed to wastewater after processing organic sewage discharged from livestock farming establishments in a normal treatment facility such as the activated sludge method or wastewater after processing organic sewage discharged from a food factory. The present invention relates to a processing agent, a processing method and a processing apparatus which are excellent in dephosphorization, decolorization and disinfection effects.
畜舎からは糞尿を含む有機汚水（畜舎汚水と云う）が排出される。この畜舎汚水には多量の有機物が含まれており、ＣＯＤ（化学的酸素要求量）やＢＯＤ（生物化学的酸素要求量）が高く、未処理のまま放流すると水質汚濁の原因になるので、活性汚泥法などを利用してＣＯＤやＢＯＤを低減する浄化方法が従来から知られている（特許文献１：特開平１０−１７４９９１号公報）。 Organic sewage containing manure (referred to as sewage) is discharged from the barn. This livestock sewage contains a large amount of organic matter, has a high COD (chemical oxygen demand) and BOD (biochemical oxygen demand), and it can cause water pollution if discharged untreated. A purification method for reducing COD and BOD using a sludge method or the like has been known (Patent Document 1: Japanese Patent Laid-Open No. 10-174991).
しかし、活性汚泥法を利用した従来の処理方法は畜舎汚水に含まれるリンを十分に除去することができないと云う問題があった。このため、無機系凝集剤を使用する凝集沈殿法が利用されており、また畜舎汚水を曝気して汚水中の溶解性リンを不溶化して除去する処理方法も知られている（特許文献２：特開２００１−１７９２６７号公報）。 However, the conventional treatment method using the activated sludge method has a problem that phosphorus contained in the barn sewage cannot be sufficiently removed. For this reason, a coagulation sedimentation method using an inorganic coagulant is used, and a treatment method is also known in which the sewage is aerated to insolubilize and remove soluble phosphorus in the sewage (Patent Document 2: JP 2001-179267 A).
さらに、排水の脱リン手段として、珪酸カルシウムを主成分とする脱リン剤が従来から知られている。例えば、特開昭６１−２６３６３６号公報（特許文献３）にはＣａＯ/ＳｉＯ2モル比が１.５〜５の珪酸カルシウム水和物を主成分とする水処理剤が記載されている。また、特公平０２−２０３１５号公報（特許文献４）には空隙率５０〜９０％の独立気泡を有する珪酸カルシウム水和物からなる脱リン材が記載されている。さらに、特開平１０−２３５３４４号公報（特許文献５）には珪酸カルシウム水和物を主成分とした直径数ミリ程度の球状または中空状に成形した脱リン材が記載されている。特開２０００−１３５４９３号公報（特許文献６）には珪灰石を用いた脱リン方法が提案されている。 Furthermore, a dephosphorizing agent mainly composed of calcium silicate is conventionally known as a dephosphorizing means for drainage. For example, Japanese Patent Laid-Open No. 61-263636 (Patent Document 3) describes a water treatment agent mainly composed of calcium silicate hydrate having a CaO / SiO 2 molar ratio of 1.5 to 5. Japanese Patent Publication No. 02-20315 (Patent Document 4) describes a dephosphorization material made of calcium silicate hydrate having closed cells with a porosity of 50 to 90%. Furthermore, Japanese Patent Application Laid-Open No. 10-235344 (Patent Document 5) describes a dephosphorization material formed into a spherical or hollow shape having a diameter of about several millimeters and containing calcium silicate hydrate as a main component. JP 2000-135493 A (Patent Document 6) proposes a dephosphorization method using wollastonite.
また、平均粒子径(メジアン径)１５０μm以下の微粉末であって細孔容積０.３cm3/ｇ以上の多孔質珪酸カルシウム水和物からなるリン回収資材（特許文献７）、あるいはＢＥＴ比表面積８０m2/ｇ以上、細孔容積０.５cm3/ｇ以上の多孔質の珪酸カルシウム水和物からなるリン回収資材が提案されている（特許文献８）。 Further, a phosphorus recovery material (Patent Document 7) made of porous calcium silicate hydrate having a mean particle diameter (median diameter) of 150 μm or less and a pore volume of 0.3 cm 3 / g or more, or a BET specific surface area A phosphorus recovery material composed of porous calcium silicate hydrate having a volume of 80 m 2 / g or more and a pore volume of 0.5 cm 3 / g or more has been proposed (Patent Document 8).
畜舎汚水の処理において、処理後の排水の色について規制はないが、着色の濃い排水は未処理と誤解され、苦情の原因になるので、脱色は汚水処理の重要課題の一つである。しかし、現実は脱色だけにコストをかける余力は農家には乏しいので脱色効果以外の効果を併せて有する処理方法が求められている。ちなみに、一般的な排水の脱色方法として、活性炭吸着法、オゾン酸化法、およびＡＬＣ粉末などの多孔体珪酸カルシウム水和物からなる粉粒体を脱色剤として利用する方法が知られている（特許文献９：特開平０８−１３１８２２号公報参照）。 In the treatment of sewage sewage, there is no restriction on the color of the wastewater after treatment, but since the colored wastewater is misunderstood as untreated and causes complaints, decolorization is one of the important issues in sewage treatment. However, in reality, farmers have little spare capacity for costing only for decolorization, and therefore, there is a need for a treatment method that has effects other than decolorization effects. By the way, as a general method for decolorizing waste water, there are known a method using an activated carbon adsorption method, an ozone oxidation method, and a granular material composed of porous calcium silicate hydrate such as ALC powder as a decoloring agent (patent) (Reference 9: Japanese Patent Laid-Open No. 08-131822).
特許文献１の処理方法によれば、畜舎汚水を活性汚泥法によって処理した後にアルカリを加えて中和し、沈殿分離した上澄液に酸化剤を加えて脱色しているが、リンを除去する効果は低い。一方、特許文献２の処理方法によれば、処理前のリン酸イオン濃度６１０ppmの汚水を３時間曝気することによってリン酸イオン濃度１００ppmに低減することができるが、脱色については殆ど効果がない。 According to the treatment method of Patent Document 1, the livestock sewage is treated by the activated sludge method and then neutralized by adding an alkali. The precipitate is separated and added with an oxidizing agent to decolorize, but phosphorus is removed. The effect is low. On the other hand, according to the treatment method of Patent Document 2, it is possible to reduce the phosphate ion concentration to 100 ppm by aeration of sewage having a phosphate ion concentration of 610 ppm before treatment for 3 hours, but there is almost no effect on decolorization.
特許文献３〜特許文献５の処理方法に用いる珪酸カルシウム水和物は、大部分がＡＬＣなどの結晶質であって多孔質の空隙にリンを吸着して除去するものであり、特許文献６の処理方法と同様に処理時間が長くかかる問題がある。また、脱色効果はない。一方、特許文献７および特許文献８のリン回収資材は非晶質の珪酸カルシウム水和物であり、リンとの反応性が高く、下水などのリン濃度を急激に低減することができ、消石灰など他の石灰質資材よりもリンの回収率が高い利点を有しているが、畜舎汚水由来の排水についての脱リン効果および脱色効果は確認されていない。 Most of the calcium silicate hydrate used in the treatment methods of Patent Documents 3 to 5 is a crystalline substance such as ALC, and adsorbs and removes phosphorus in a porous void. As with the processing method, there is a problem that the processing time is long. Moreover, there is no decoloring effect. On the other hand, the phosphorus recovery materials of Patent Document 7 and Patent Document 8 are amorphous calcium silicate hydrates, have high reactivity with phosphorus, can rapidly reduce the phosphorus concentration of sewage, etc. Although it has the advantage that the recovery rate of phosphorus is higher than other calcareous materials, no dephosphorization effect and decoloration effect have been confirmed for wastewater derived from barn sewage.
また、特許文献９の処理方法は、ＡＬＣなどの珪酸カルシウム水和物を用いて着色液体を脱色することが記載されているが、ＡＬＣはトバモライトを主体とした結晶質であるため畜舎汚水由来の排水にＡＬＣ粉末を投入しても十分な脱色効果を得ることができず、また脱リン効果も低い。 Moreover, although the processing method of patent document 9 describes decoloring a coloring liquid using calcium silicate hydrates, such as ALC, since ALC is a crystalline substance mainly having a tobermorite, it originates in sewage from sewage. Even if ALC powder is added to the waste water, a sufficient decoloring effect cannot be obtained, and the dephosphorization effect is low.
本発明は、従来の処理方法における上記問題を解決したものであって、畜舎汚水などの有機性汚水を処理した排水について、優れた脱リン効果と共に脱色および消毒効果を有する処理剤および処理方法を提供する。 The present invention solves the above-mentioned problems in the conventional treatment method, and is a treatment agent and treatment method having a decolorization and disinfection effect as well as an excellent dephosphorization effect for wastewater treated with organic sewage such as livestock sewage. provide.
本発明は、有機汚水由来の排水の処理について、以下の構成からなる脱リン脱色消毒剤とその処理方法および処理装置に関する。
〔１〕遊離石灰Ｃａ(ＯＨ) ２ を含む非晶質珪酸カルシウム水和物の凝集体からなり、該Ｃａ(ＯＨ) ２ 量が２９.８wt％〜８０wt％であり、有機汚水の排水に含まれるリンの除去、脱色、消毒、汚泥濃縮の促進に用いられることを特徴とする排水の脱リン脱色消毒剤。
〔２〕シリカ溶解液に消石灰を加えて合成した非晶質珪酸カルシウム水和物と未反応の遊離石灰Ｃａ(ＯＨ)２の凝集体からなる上記[１]に記載する排水の脱リン脱色消毒剤。
〔３〕遊離石灰Ｃａ(ＯＨ) ２ を含む非晶質珪酸カルシウム水和物の凝集体を、有機汚水を生物処理した後の排水に投入して該排水に含まれるリンおよび着色原因成分を取り込んだ沈殿を生成させ、該沈殿を固液分離することによってリンを除去すると同時に該汚水を脱色、消毒することを特徴とする排水の処理方法。
〔４〕シリカ溶解液に消石灰を加えて合成した非晶質珪酸カルシウム水和物と未反応の遊離石灰Ｃａ(ＯＨ)２の凝集体を用いる上記[３]に記載する排水の処理方法。
〔５〕遊離石灰Ｃａ(ＯＨ) ２ を含む非晶質珪酸カルシウム水和物の凝集体を、脱リンのみのときには該排水のｐＨ８以上になるように添加し、脱リン、脱色、消毒の同時処理のときにはｐＨ１１以上になるように添加する上記[３]または上記[４]に記載する排水の処理方法。
〔６〕遊離石灰Ｃａ(ＯＨ) ２ を含む非晶質珪酸カルシウム水和物の凝集体を排水に添加し、生成した沈殿物を他の汚水処理工程から発生する汚泥と混合することによって汚泥の沈降濃縮を促進する上記[３]〜上記[５]の何れかに記載する有機汚水の処理方法。
〔７〕第一沈殿槽、曝気槽、第二沈殿槽、添加槽、処理槽、中和槽、および濃縮槽を備えており、遊離石灰Ｃａ(ＯＨ) ２ を含む非晶質珪酸カルシウム水和物の凝集体からなり、該Ｃａ(ＯＨ) ２ 量が２９.８wt％〜８０wt％である脱リン脱色消毒剤が上記添加槽に添加される有機汚水処理装置であって、第一沈殿槽に有機汚水が導入されて固形分が沈殿分離され、第一沈殿槽の液分は曝気槽に導入されて活性汚泥処理が行われ、曝気槽を経た活性汚泥混合液は第二沈殿槽に導入されて沈殿した汚泥が系外に除去されると共に汚泥の一部は曝気槽に返送され、残りの汚泥は濃縮槽に送られ、第二沈殿槽を経た液分は添加槽に送られ、該添加槽で上記脱リン脱色消毒剤が添加された後に処理槽に送られ、該処理槽においてリンおよび着色成分を取り込んだ上記凝集体の沈殿物は系外に抜き出されて濃縮槽に送られ、該凝集体の沈殿物によって濃縮槽で汚泥の沈降濃縮が促進され、濃縮された汚泥が回収され、処理槽を経た液分は中和槽において中和された後に系外に排出されることを特徴とする有機汚水処理装置。
〔８〕濃縮槽から抜き出された濃縮汚泥を肥料成分として利用する上記[７]に記載する有機汚水の処理装置。
The present invention relates to a dephosphorization / disinfectant having the following constitution, a treatment method thereof, and a treatment apparatus for treatment of wastewater derived from organic wastewater.
[1] Consists of aggregates of amorphous calcium silicate hydrate containing free lime Ca (OH) 2 , the amount of Ca (OH) 2 being 29.8 wt% to 80 wt%, and included in the drainage of organic sewage A dephosphorizing / disinfecting agent for waste water, which is used to promote removal, decolorization, disinfection, and sludge concentration.
[2] Dephosphorization / discoloration / disinfection of waste water as described in [1] above, comprising an aggregate of amorphous calcium silicate hydrate synthesized by adding slaked lime to a silica solution and unreacted free lime Ca (OH) 2 Agent.
[3] Aggregates of amorphous calcium silicate hydrate containing free lime Ca (OH) 2 are put into wastewater after biological treatment of organic wastewater to incorporate phosphorus and coloring-causing components contained in the wastewater A wastewater treatment method characterized in that a precipitate is produced, phosphorus is removed by solid-liquid separation of the precipitate, and at the same time, the sewage is decolorized and disinfected.
[4] The wastewater treatment method according to the above [3], which uses an aggregate of amorphous calcium silicate hydrate synthesized by adding slaked lime to a silica solution and unreacted free lime Ca (OH) 2 .
[5] Aggregate of amorphous calcium silicate hydrate containing free lime Ca (OH) 2 is added so that the pH of the waste water is 8 or more when dephosphorization alone, and simultaneous dephosphorization, decolorization and disinfection The waste water treatment method according to [3] or [4], wherein the waste water is added so that the pH is 11 or more during treatment.
[6] Aggregate of amorphous calcium silicate hydrate containing free lime Ca (OH) 2 is added to the wastewater, and the generated precipitate is mixed with sludge generated from other sewage treatment processes. The method for treating organic sewage according to any one of [3] to [5] above, which promotes sedimentation concentration.
[7] Amorphous calcium silicate hydrate containing free lime Ca (OH) 2 , comprising a first precipitation tank, an aeration tank, a second precipitation tank, an addition tank, a treatment tank, a neutralization tank, and a concentration tank An organic sewage treatment apparatus comprising a dephosphorization / discoloration disinfectant comprising 29.8 wt% to 80 wt% of the Ca (OH) 2 in the first settling tank. Organic sewage is introduced and the solid content is precipitated and separated. The liquid in the first sedimentation tank is introduced into the aeration tank to perform activated sludge treatment. The activated sludge mixed liquid that has passed through the aeration tank is introduced into the second precipitation tank. The sludge precipitated and removed is removed from the system and part of the sludge is returned to the aeration tank. The remaining sludge is sent to the concentration tank, and the liquid that passes through the second precipitation tank is sent to the addition tank. is sent to the treatment tank after the dephosphorization bleaching disinfecting agent is added in the bath, Captures phosphorus and coloring components in the processing tank It precipitates of the aggregates is sent to the concentration tank is withdrawn out of the system is facilitated thickener of sludge in concentration tank by precipitation of the aggregates, sludge enriched is recovered and the processing tank An organic sewage treatment apparatus, wherein the passed liquid is neutralized in a neutralization tank and then discharged out of the system.
[8] The organic sewage treatment apparatus according to [7], wherein the concentrated sludge extracted from the concentration tank is used as a fertilizer component.
本発明の脱リン脱色消毒剤およびその処理方法によれば、有機汚水を生物処理した後の排水に含まれるリンを略全量除去することができ、リンの除去効果に優れており、かつ排水を脱色して色度の指標となる３９０nm吸光度（以下、単に吸光度と云う）を大幅に低下させることができ、脱色効果に優れる。さらに添加量によっては大腸菌群も格段に低減でき、消毒効果も有している。また、添加によって発生するＣＳＨ凝集体沈殿物は生物処理施設から発生する汚泥の沈降濃縮促進効果も有している。 According to the dephosphorization / disinfectant and the treatment method thereof of the present invention, it is possible to remove substantially the entire amount of phosphorus contained in the waste water after biological treatment of organic wastewater, which is excellent in the effect of removing phosphorus, 390 nm absorbance (hereinafter simply referred to as absorbance), which serves as an index of chromaticity by decolorization, can be greatly reduced, and the decolorization effect is excellent. Furthermore, depending on the amount added, the coliform group can be remarkably reduced and also has a disinfection effect. Further, the CSH aggregate precipitate generated by the addition also has an effect of promoting sedimentation and concentration of sludge generated from the biological treatment facility.
本発明の脱リン脱色消毒剤およびその処理方法によれば、短時間で排水を脱リン、脱色することができる。具体的には、例えば、本発明の脱リン脱色消毒剤を排水に２０g/L添加し、３０分静置することによって、リン濃度（PO4-P）を検出限界以下にし、さらに吸光度を大幅に低下させて脱色率は７０％以上となる。 According to the dephosphorization / disinfectant and the treatment method thereof of the present invention, the waste water can be dephosphorized and decolorized in a short time. Specifically, for example, by adding 20 g / L of the dephosphorizing / disinfecting disinfectant of the present invention to the waste water and allowing to stand for 30 minutes, the phosphorous concentration (PO 4 -P) is reduced below the detection limit, and the absorbance is greatly increased. The decolorization rate becomes 70% or more.
また、本発明の脱リン脱色消毒剤およびその処理方法によれば、排水の消毒効果が得られる。具体的には、ｐＨを１０.４以上に高めると、排水に含まれる大腸菌群の検出数を１mLあたり４cfu以下にまで大幅に低減することができる。乳牛ふん尿中の大腸菌は２０℃ではｐＨ１０以上、４℃ではｐＨ１１以上で低減するという報告があり（北海道立畜産試験場畜産環境科、平成１５年度北海道農業試験会議（成績会議）畜産部会提出課題）、また、家畜***物スラリー（高濃度液状物）中の***ウイルスの消毒法の１つとしてｐＨを１１以上に上昇させることが公知の事実として知られていることから（農林水産省消費・***動物衛生課長通知、２２消安第３２３２号、平成22年7月1日)、ｐＨを１１以上に高めることは消毒に有効と考えられる。 In addition, according to the dephosphorization / decolorization disinfectant and the treatment method thereof of the present invention, the drainage disinfection effect can be obtained. Specifically, when the pH is increased to 10.4 or more, the number of coliform bacteria contained in the wastewater can be greatly reduced to 4 cfu or less per mL. There is a report that E. coli in dairy cow manure is reduced to pH 10 or higher at 20 ° C and pH 11 or higher at 4 ° C (Hokkaido Prefectural Livestock Experiment Station Livestock Environment Department, 2003 Hokkaido Agricultural Experiment Conference (Results Meeting) Livestock Division Submission Problem), In addition, as one of the methods for disinfecting foot-and-mouth disease virus in livestock excrement slurry (high-concentration liquid material), it is known as a known fact that the pH is raised to 11 or more (Ministry of Agriculture, Forestry and Fisheries Consumption and Safety Bureau) Animal health section manager notice, 22 Sanitation No. 3232, July 1, 2010), raising the pH to 11 or more is considered effective for disinfection.
本発明の処理装置によれば、曝気槽の活性汚泥処理によってＣＯＤおよびＢＯＤを低下させた後に、本発明の脱リン脱色消毒剤を用いた処理によって効果的にリンを除去して脱色すると共に消毒することもできる。また、脱リン脱色消毒剤によって処理した汚泥にはリン、カルシウム、シリカが多量に含まれているので汚泥を肥料成分として有効に利用することができる。 According to the treatment apparatus of the present invention, after reducing COD and BOD by activated sludge treatment in an aeration tank, phosphorus is effectively removed and decolorized and disinfected by treatment using the dephosphorization / disinfectant of the present invention. You can also Moreover, since sludge treated with a dephosphorizing / disinfecting agent contains a large amount of phosphorus, calcium, and silica, the sludge can be effectively used as a fertilizer component.
以下、本発明を実施形態に基づいて具体的に説明する。
本発明の脱リン脱色消毒剤は、牛舎や豚舎などの畜舎から排出される畜舎汚水を活性汚泥法などの通常の処理施設で処理した後の排水、あるいは食品工場から排出される汚水を処理した後の排水などを対象とし、これらの排水に含まれるリンを除去し同時に脱色し消毒する処理剤である。なお、畜舎汚水および食品工場などから排出される有機性の汚水を含めて有機汚水と云う。この有機汚水を活性汚泥法などの通常の汚水処理した後を排水と云う。本発明の処理方法は上記脱リン脱色消毒剤を用いる有機汚水の処理方法ないし有機汚水由来の排水の処理方法である。
Hereinafter, the present invention will be specifically described based on embodiments.
The dephosphorizing / disinfecting agent of the present invention processed wastewater discharged from a barn such as a cowshed or a pig barn in a normal treatment facility such as an activated sludge method, or wastewater discharged from a food factory. It is a treatment agent that removes phosphorus contained in these wastewaters, and simultaneously decolorizes and disinfects them. In addition, organic sewage includes organic sewage discharged from livestock sewage and food factories. The organic wastewater is treated as normal wastewater such as an activated sludge process and is called drainage. The treatment method of the present invention is a method for treating organic sewage or a method for treating wastewater derived from organic sewage using the dephosphorization / disinfecting agent.
〔脱リン脱色消毒剤〕
本発明の脱リン脱色消毒剤は、遊離石灰Ｃａ(ＯＨ) ２ を含む非晶質珪酸カルシウム水和物の凝集体（ＣＳＨ凝集体と云う）からなる。シリカの溶解液に消石灰を加えて、加熱下で反応させると非晶質珪酸カルシウム水和物が生成し、消石灰の添加量に応じて、未反応のＣａ(ＯＨ)２〔遊離石灰〕が非晶質珪酸カルシウム水和物の組織中に取り込まれたＣＳＨ凝集体が生成する。本発明の脱リン脱色消毒剤はこのような遊離石灰Ｃａ(ＯＨ) ２ を含む非晶質珪酸カルシウム水和物の凝集体である。
[Dephosphorization and discoloration disinfectant]
Dephosphorization bleaching disinfectant of the present invention consists of aggregates of amorphous calcium silicate hydrate containing free lime Ca (OH) 2 (referred to as CSH aggregate). When slaked lime is added to the silica solution and reacted under heating, amorphous calcium silicate hydrate is formed. Depending on the amount of slaked lime added, unreacted Ca (OH) 2 [free lime] is non-reacting. CSH aggregates are formed that are incorporated into the structure of crystalline calcium silicate hydrate. The dephosphorization / disinfecting agent of the present invention is an aggregate of amorphous calcium silicate hydrate containing such free lime Ca (OH) 2 .
上記ＣＳＨ凝集体のＸＲＤチャートの一例を図１に示す。図示するように、ＣＳＨ凝集体には非晶質の珪酸カルシウム水和物とＣａ(ＯＨ)2が含まれている。本発明の脱リン脱色消毒剤は、好ましくは、このような非晶質珪酸カルシウム水和物とＣａ(ＯＨ)2の凝集体からなるものである。 An example of the XRD chart of the CSH aggregate is shown in FIG. As shown in the figure, the CSH aggregate contains amorphous calcium silicate hydrate and Ca (OH) 2 . The dephosphorization / disinfecting agent of the present invention is preferably composed of an aggregate of such amorphous calcium silicate hydrate and Ca (OH) 2 .
本発明の脱リン脱色消毒剤に含まれる珪酸カルシウム水和物は非晶質であるので、脱リン効果に優れる。ＡＬＣのような結晶質珪酸カルシウム水和物は非晶質の珪酸カルシウム水和物よりもリンに対する吸着性が低いので、本発明の脱リン脱色消毒剤に比べて脱リン効果が大幅に低く、脱色効果も低い。 Since the calcium silicate hydrate contained in the dephosphorizing / disinfecting agent of the present invention is amorphous, it has an excellent dephosphorizing effect. Since crystalline calcium silicate hydrate such as ALC has lower adsorptivity to phosphorus than amorphous calcium silicate hydrate, its dephosphorization effect is significantly lower than that of the dephosphorization / disinfectant of the present invention, Decolorization effect is also low.
本発明の脱リン脱色消毒剤は非晶質珪酸カルシウム水和物と共に未反応のＣａ(ＯＨ) ２ 〔遊離石灰〕を含む。該Ｃａ(ＯＨ)２を含まない非晶質珪酸カルシウム水和物は本発明の脱リン脱色消毒剤とほぼ同様の脱リン効果を示すが、脱色効果は大幅に劣る。該Ｃａ(ＯＨ)2の含有量は２９.８wt％〜８０wt％が好ましい。
The dephosphorizing / disinfecting agent of the present invention contains unreacted Ca (OH) 2 [free lime] together with amorphous calcium silicate hydrate. The amorphous calcium silicate hydrate containing no Ca (OH) 2 exhibits a dephosphorizing effect almost similar to that of the dephosphorizing / disinfecting agent of the present invention, but the decoloring effect is significantly inferior. The Ca (OH) 2 content is preferably 29.8 wt% to 80 wt%.
〔処理方法〕
本発明の処理方法は、上記ＣＳＨ凝集体からなる脱リン脱色消毒剤を、有機汚水を生物処理（活性汚泥処理など）した後の排水に投入して、該排水に含まれるリンおよび着色原因成分を取り込んだ沈殿を生成させ、該沈殿を固液分離することによってリンを除去すると同時に該汚水を脱色、消毒する排水の処理方法である。
〔Processing method〕
In the treatment method of the present invention, the dephosphorization / decolorization disinfectant comprising the CSH aggregate is introduced into wastewater after biological treatment (eg, activated sludge treatment) of organic wastewater, and phosphorus contained in the wastewater and coloring cause components Is a wastewater treatment method in which phosphorus is removed by solid-liquid separation of the precipitate, and at the same time the waste water is decolorized and disinfected.
また、本発明の処理方法は、上記ＣＳＨ凝集体からなる脱リン脱色消毒剤を、有機汚水由来の排水に添加し、生成した沈殿物を他の汚水処理工程から発生する汚泥と混合することによって汚泥の沈降濃縮を促進する有機汚水の処理方法にも適用される。 Moreover, the treatment method of the present invention adds the dephosphorization / disinfectant comprising the CSH aggregates to the wastewater derived from organic wastewater, and mixes the generated precipitate with sludge generated from other wastewater treatment steps. It can also be applied to organic sewage treatment methods that promote sedimentation and concentration of sludge.
上記ＣＳＨ凝集体からなる本発明の脱リン脱色消毒剤について、リン除去のみを目的とする場合は該排水のｐＨが８以上になる量を添加して沈殿を生成させることによって、該排水に含まれるリンを沈殿に取り込ませて排水からリンを除去する。また、ｐＨが１１以上になる量を添加すれば脱リンと脱色と消毒を同時に行うことができる。生成した沈殿物は静置して固液分離し、系外に除去すればよい。 About the dephosphorization / decolorization disinfectant of the present invention comprising the above CSH aggregates, when the purpose is to remove only phosphorus, it is contained in the waste water by adding an amount that causes the pH of the waste water to be 8 or more to produce a precipitate. Incorporate phosphorus into the precipitate to remove phosphorus from the wastewater. Moreover, if the quantity which makes pH 11 or more is added, dephosphorization, decoloring, and disinfection can be performed simultaneously. The generated precipitate may be left standing, separated into solid and liquid, and removed outside the system.
〔処理装置〕
本発明の処理方法に基づく有機汚水の処理装置を図２に示す。図示する処理装置は、第一沈殿槽１０、曝気槽１１、第二沈殿槽１２、脱リン脱色消毒剤の添加槽１３、処理槽１４、中和槽１５を有しており、第二沈殿槽１２には濃縮槽１６が接続している。
[Processing equipment]
An organic wastewater treatment apparatus based on the treatment method of the present invention is shown in FIG. The illustrated processing apparatus includes a first precipitation tank 10, an aeration tank 11, a second precipitation tank 12, a dephosphorization / disinfectant addition tank 13, a treatment tank 14, and a neutralization tank 15, and a second precipitation tank. 12 is connected to a concentration tank 16.
第一沈殿槽１０には有機汚水が導入され、固形分が沈殿分離される。第一沈殿槽１０の液分は曝気槽１１に導入される。曝気槽１１は活性汚泥処理を行う処理槽であり、槽底から吹き込まれる空気によって槽内を曝気し、好気条件下で活性汚泥処理を行い、有機汚水のＣＯＤ（化学的酸素要求量）およびＢＯＤ（生物化学的酸素要求量）を低下させる。曝気槽１１を経た活性汚泥混合液は第二沈殿槽１２に導入され、生成した沈殿（汚泥）を系外に除去し、一部は曝気槽１１に返送して活性汚泥処理に利用する。第二沈殿槽１２から抜き出された汚泥は濃縮槽１６に送られる。 Organic sewage is introduced into the first settling tank 10 to precipitate and separate the solid content. The liquid in the first precipitation tank 10 is introduced into the aeration tank 11. The aeration tank 11 is a treatment tank that performs activated sludge treatment. The aeration tank 11 is aerated with air blown from the bottom of the tank, activated sludge treatment is performed under aerobic conditions, and organic wastewater COD (chemical oxygen demand) and Reduce BOD (Biochemical Oxygen Demand). The activated sludge mixed liquid that has passed through the aeration tank 11 is introduced into the second settling tank 12, and the generated precipitate (sludge) is removed from the system, and a part thereof is returned to the aeration tank 11 for use in the activated sludge treatment. The sludge extracted from the second sedimentation tank 12 is sent to the concentration tank 16.
第二沈殿槽１２から流出した排水は添加槽１３に送られ、ここで本発明の脱リン脱色消毒剤が添加される。脱リン脱色消毒剤を添加して攪拌された液は処理槽１４に送られる。処理槽１４は沈殿槽を兼ねており、脱リン脱色消毒剤によってリンおよび着色原因成分を取り込んだ沈殿物が生成し、また大腸菌群の低減が起きる。沈殿物は固液分離して系外に抜き出され、濃縮槽１６に送られる。 Waste water flowing out from the second sedimentation tank 12 is sent to the addition tank 13, where the dephosphorization / disinfecting agent of the present invention is added. The liquid stirred and added with the dephosphorization / decolorization disinfectant is sent to the treatment tank 14. The treatment tank 14 also serves as a precipitation tank, and a precipitate incorporating phosphorus and coloring-causing components is generated by the dephosphorization and decolorization disinfectant, and the coliform group is reduced. The precipitate is separated from the system by solid-liquid separation and sent to the concentration tank 16.
処理槽１４から抜き出された液分は、例えば、リン濃度（PO4-P）が検出限界以下、色度が１００以下に低減され、また大腸菌群が低減する。液分は、脱リン脱色消毒剤の添加によってｐＨ８以上のアルカリ性になっているので、ｐＨの排水基準の上限値（海域に排出されるもので9.0、海域以外で8.6）を超える場合には、中和槽１５に送り、塩酸等の添加または炭酸ガスの導入によって排水基準に適するようにｐＨ調整した後に系外に排出される。 The liquid component extracted from the treatment tank 14 has, for example, a phosphorus concentration (PO 4 -P) that is below the detection limit, a chromaticity that is 100 or less, and a coliform group that is reduced. Since the liquid has become alkaline with a pH of 8 or more due to the addition of a dephosphorizing / disinfecting disinfectant, if it exceeds the upper limit of pH drainage standards (9.0 when discharged to the sea area, 8.6 outside the sea area) It is sent to the neutralization tank 15, and after being adjusted to a pH suitable for drainage standards by adding hydrochloric acid or the like or introducing carbon dioxide, it is discharged out of the system.
処理槽１４から抜き出されたＣＳＨ凝集体沈殿物は濃縮槽１６に送られる。濃縮槽１６において、沈殿物に含まれる本発明の脱リン脱色消毒剤は汚泥の濃縮を促進する効果を発揮する。この汚泥にはリン、カルシウム、シリカが多く含まれているので、これを堆肥化施設に送って肥料成分として有効に利用することができる。例えば、濃縮された汚泥は脱水処理され、堆肥化施設において必要に応じて他の固形有機物が添加されて肥料になる。 The CSH aggregate precipitate extracted from the treatment tank 14 is sent to the concentration tank 16. In the concentration tank 16, the dephosphorization / discoloration disinfectant of the present invention contained in the precipitate exhibits the effect of promoting the concentration of sludge. Since this sludge contains a large amount of phosphorus, calcium and silica, it can be sent to a composting facility and effectively used as a fertilizer component. For example, the concentrated sludge is dehydrated, and other solid organic matter is added as necessary to a fertilizer in a composting facility.
以下、本発明の実施例を比較例と共に示す。なお、各例において、ｐＨ測定は市販のｐＨ測定器（HORIBA, TWINpH）を用いた。また、吸光度は試料液を０.４５μmメンブレンフィルター（MILLIPORE, IC Millex-LH）で濾過した後、紫外可視分光光度計（SHIMADZU, UV mini 1240）を用いて測定波長３９０nmで測定した。リン濃度（PO4-P）はイオンクロマトグラフィー（TOSOH, IC-2010, TSKgel Super IC-Anion HS）を用いて測定した。 Examples of the present invention are shown below together with comparative examples. In each example, a commercially available pH meter (HORIBA, TWINpH) was used for pH measurement. Absorbance was measured at a measurement wavelength of 390 nm using a UV-visible spectrophotometer (SHIMADZU, UV mini 1240) after filtering the sample solution with a 0.45 μm membrane filter (MILLIPORE, IC Millex-LH). The phosphorus concentration (PO 4 -P) was measured using ion chromatography (TOSOH, IC-2010, TSKgel Super IC-Anion HS).
〔実施例１〕
本発明の脱リン脱色消毒剤について、合成して得たＣＳＨ凝集体のＸＲＤチャートの一例を図１に示す。図中、試料No.１はシリカ溶解液に添加した消石灰の量がCa/Si配合モル比１.０の場合、試料No.２はCa/Si配合モル比１.２の場合である。図示するように、ＣＳＨ凝集体には非晶質の珪酸カルシウム水和物とＣａ(ＯＨ)2が含まれている。
[Example 1]
An example of the XRD chart of the CSH aggregate obtained by synthesizing the dephosphorizing / disinfecting agent of the present invention is shown in FIG. In the figure, sample No. 1 is when the amount of slaked lime added to the silica solution is a Ca / Si blending molar ratio of 1.0, and sample No. 2 is when the Ca / Si blending molar ratio is 1.2. As shown in the figure, the CSH aggregate contains amorphous calcium silicate hydrate and Ca (OH) 2 .
〔実施例２〕
本発明の脱リン脱色消毒剤として、合成して得たＣＳＨ凝集体〔Ca(OH)2含有量29.8wt％、Ca/Siモル比3.44〕を用い、比較試料として結晶質珪酸カルシウム水和物粉末（市販のＡＬＣ粉末）を用いた。畜舎汚水を活性汚泥処理した後の排水２００mLを入れたビーカに表１の濃度になるように脱リン脱色消毒剤を添加し、１５０rpmで５分間攪拌した後に４０rpmで１０分間攪拌した。攪拌後、２０分間静置し、上澄み液を採取して吸光度およびリン濃度（PO4-P）を測定した。測定結果を表１に示した。また添加量による吸光度の変化を図３に示し、リン濃度の変化を図４に示した。
[Example 2]
As a dephosphorization / disinfecting agent of the present invention, a CSH aggregate obtained by synthesis [Ca (OH) 2 content 29.8 wt%, Ca / Si molar ratio 3.44] is used, and crystalline calcium silicate hydrate is used as a comparative sample. Powder (commercial ALC powder) was used. A dephosphorizing / disinfecting disinfectant was added to a beaker containing 200 mL of waste water after activated sludge treatment of slaughterhouse sewage so as to have the concentration shown in Table 1, and stirred at 150 rpm for 5 minutes and then at 40 rpm for 10 minutes. After stirring, the mixture was allowed to stand for 20 minutes, and the supernatant was collected and the absorbance and phosphorus concentration (PO 4 -P) were measured. The measurement results are shown in Table 1. Further, the change in absorbance with the addition amount is shown in FIG. 3, and the change in phosphorus concentration is shown in FIG.
図３に示すように、本発明の脱リン脱色消毒剤は添加量が１０g/Lを上回ると排水の吸光度が急激に低下し、吸光度０.１以下（脱色率７１％以上）になる。また、図４に示すように、本発明の脱リン脱色消毒剤は少量で汚水のリン濃度が急激に低下し、添加量５g/Lでほぼ全量のリンが除去され、添加量１０g/L以上ではリン濃度（PO4-P）は検出限界以下に低下する。 As shown in FIG. 3, when the dephosphorization / disinfecting agent of the present invention is added in an amount of more than 10 g / L, the absorbance of the waste water rapidly decreases to an absorbance of 0.1 or less (decolorization rate of 71% or more). Further, as shown in FIG. 4, the dephosphorization / disinfecting agent of the present invention has a small amount of sewage, and the concentration of sewage drastically decreases. Then the phosphorus concentration (PO 4 -P) falls below the detection limit.
一方、比較試料のＡＬＣ粉末は、添加量２０g/Lでも排水の吸光度は０.２７（脱色率２２％）であり、本発明に比べて脱色効果は大幅に低い。また、排水のリン濃度（PO4-P）は添加量２０g/Lで約５７mg/Lであり、本発明に比べて脱リン効果も大幅に低い。 On the other hand, the ALC powder of the comparative sample has a wastewater absorbance of 0.27 (decoloration rate of 22%) even at an addition amount of 20 g / L, and the decolorization effect is significantly lower than that of the present invention. Further, the phosphorus concentration (PO 4 -P) of the waste water is about 57 mg / L at an addition amount of 20 g / L, and the dephosphorization effect is significantly lower than that of the present invention.
なお、本発明の脱リン脱色消毒剤は遊離石灰を含むので、表１に示すように、添加量に応じて排水のｐＨが急激に高くなり、表１の試験に用いた排水では、添加量１０g/L以上で約ｐＨ１２以上の強アルカリ性になる。一方、比較試料のＡＬＣは添加量が増えても排水のｐＨは殆ど変化しない。このように、本発明の脱リン脱色消毒剤によって排水は強アルカリ性になるので高い消毒効果を得ることができる。 Since the dephosphorization / disinfecting agent of the present invention contains free lime, as shown in Table 1, the pH of the wastewater increases rapidly according to the amount of addition, and the amount of addition in the wastewater used in the test of Table 1 It becomes strong alkalinity of about pH 12 or more at 10 g / L or more. On the other hand, the ALC of the comparative sample hardly changes the pH of the wastewater even when the amount added is increased. Thus, the dephosphorization / disinfecting agent of the present invention makes the waste water strongly alkaline, so that a high disinfecting effect can be obtained.
〔実施例３〕
本発明の脱リン脱色消毒剤として、合成して得たＣＳＨ凝集体〔Ca(OH)2含有量29.8wt％、Ca/Siモル比3.44〕を用い、比較試料として消石灰を含まない非晶質珪酸カルシウム水和物粉末〔ＣＳＨゲル〕を用いた。畜舎汚水を活性汚泥処理した後の排水２００mLを入れたビーカに１０ｇ/Ｌ、２０ｇ/Ｌになるように脱リン脱色消毒剤および比較試料をそれぞれ添加し、１５０rpmで５分間攪拌した後に４０rpmで１０分間攪拌した。攪拌後、２０分間静置し、上澄み液を採取して吸光度を測定した。また添加量による吸光度の変化を図５に示した。
Example 3
As a dephosphorization / decolorization disinfectant of the present invention, a CSH aggregate obtained by synthesis [Ca (OH) 2 content 29.8 wt%, Ca / Si molar ratio 3.44] is used as a comparative sample. Calcium silicate hydrate powder [CSH gel] was used. A dephosphorizing / discoloring disinfectant and a comparative sample were added to a beaker containing 200 mL of waste water after activated sludge treatment of slaughterhouse sewage so as to be 10 g / L and 20 g / L. Stir for minutes. After stirring, the mixture was allowed to stand for 20 minutes, and the supernatant was collected and the absorbance was measured. The change in absorbance with the amount added is shown in FIG.
図５に示すように、本発明の脱リン脱色消毒剤を添加すると、添加量１０ｇ/Ｌで排水の吸光度は０.１に低下し、添加量２０ｇ/Ｌで吸光度は０.０７に低下する（脱色率８０％）。一方、比較試料のＣＳＨゲルは、図５に示すように、ＣＳＨゲルの添加量２０g/Lでも吸光度は０.２７と高く（脱色率２２％）、本発明に比べて脱色効果は大幅に低い。 As shown in FIG. 5, when the dephosphorization / disinfecting agent of the present invention is added, the absorbance of the waste water decreases to 0.1 at an addition amount of 10 g / L, and the absorbance decreases to 0.07 at an addition amount of 20 g / L. (Decolorization rate 80%). On the other hand, as shown in FIG. 5, the CSH gel of the comparative sample has a high absorbance of 0.27 (decoloration rate of 22%) even when the addition amount of CSH gel is 20 g / L, and the decolorization effect is significantly lower than that of the present invention. .
〔実施例４〕
畜舎汚水を活性汚泥処理した後の排水２００mＬに本発明の脱リン脱色消毒剤を添加して約１時間反応させた後に上澄み液を採取して中和処理した処理水について、規格（JIS K 0120）に準じて大腸菌群を計数した。大腸菌群数の異なる２種の排水について、この処理結果を表２に示した。表２に示すように、本発明の脱リン脱色消毒剤の添加量に応じて大腸菌群が減少し、特にｐＨ１0.4以上では減少が顕著であり、本発明の脱リン脱色消毒剤による消毒効果が確認された。
Example 4
Regarding treated water that was neutralized by collecting the supernatant liquid after adding the dephosphorization / disinfecting agent of the present invention to 200 mL of waste water after activated sludge treatment of livestock sewage and reacting for about 1 hour, the standard (JIS K 0120 ) To count coliforms. Table 2 shows the results of this treatment for two types of wastewater with different numbers of coliforms. As shown in Table 2, the coliform group decreases according to the addition amount of the dephosphorizing / disinfecting agent of the present invention, and the decrease is particularly remarkable at pH 10.4 or more. The disinfecting effect by the dephosphorizing / disinfecting agent of the present invention. Was confirmed.
〔実施例５〕
畜舎汚水処理施設（活性汚泥法）の曝気槽から採取した活性汚泥混合液１Ｌに本発明の脱リン脱色消毒剤（CSH凝集体）を徐々に添加して攪拌した後に、さらに３００rpmで５分間攪拌した。この活性汚泥混合液を容量１Ｌのメスシリンダーに移して静置し沈降濃縮を行い、０.５時間経過後、４時間経過後、５時間経過後、２４時間経過後の濃縮汚泥層容量を測定した。この結果を表３に示した。
Example 5
After gradually adding and stirring the dephosphorizing / disinfecting agent (CSH aggregate) of the present invention to 1 L of the activated sludge mixed liquid collected from the aeration tank of the livestock sewage treatment facility (activated sludge method), the mixture is further stirred at 300 rpm for 5 minutes. did. This activated sludge mixture is transferred to a 1 L graduated cylinder and allowed to stand for sedimentation concentration. After 0.5 hours, 4 hours, 5 hours, and 24 hours, the concentrated sludge layer volume is measured. did. The results are shown in Table 3.
表３に示すように、無添加の試料では０.５時間経過〜５時間経過したときの濃縮汚泥層容量は９９０〜８８０mLであるが、本発明の脱リン脱色消毒剤を１０g/L添加した試料では０.５時間経過〜５時間経過したときは９５０〜５４０mLであった。また、本発明の脱リン脱色消毒剤を２０g/L添加した試料では０.５時間経過〜５時間経過したときの濃縮汚泥層容量は６３０〜３２０mLであり、何れも短時間に汚泥が沈殿しており沈降性に優れている。この結果より、汚水処理施設から発生する汚泥の沈降濃縮時間を短縮でき、濃縮槽容量を低減することができる。 As shown in Table 3, the concentration of the concentrated sludge layer after lapse of 0.5 to 5 hours is 990 to 880 mL in the additive-free sample, but 10 g / L of the dephosphorization / decolorization disinfectant of the present invention was added. In the sample, it was 950 to 540 mL when 0.5 hour to 5 hours passed. In addition, in the sample added with 20 g / L of the dephosphorizing / disinfecting disinfectant of the present invention, the concentrated sludge layer capacity after lapse of 0.5 hours to 5 hours is 630 to 320 mL, and sludge is precipitated in a short time. Excellent sedimentation. From this result, the sedimentation concentration time of sludge generated from the sewage treatment facility can be shortened, and the concentration tank capacity can be reduced.
１０−第一沈殿槽、１１−曝気槽、１２−第二沈殿槽、１３−添加槽、１４−処理槽、１５−中和槽、１６−濃縮槽。 10-first precipitation tank, 11-aeration tank, 12-second precipitation tank, 13-addition tank, 14-treatment tank, 15-neutralization tank, 16-concentration tank.
Claims (8)
The apparatus for treating organic sewage according to claim 7, wherein the concentrated sludge extracted from the concentration tank is used as a fertilizer component.
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