JP2008229450A - Livestock wastewater treatment method and livestock wastewater treatment system - Google Patents
Livestock wastewater treatment method and livestock wastewater treatment system Download PDFInfo
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- 244000144972 livestock Species 0.000 title claims abstract description 110
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 39
- 238000011282 treatment Methods 0.000 claims abstract description 129
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000002351 wastewater Substances 0.000 claims abstract description 73
- 238000000034 method Methods 0.000 claims description 32
- 238000005273 aeration Methods 0.000 claims description 5
- 238000005276 aerator Methods 0.000 claims description 4
- 210000002700 urine Anatomy 0.000 claims description 3
- 238000004042 decolorization Methods 0.000 description 11
- 238000009792 diffusion process Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012860 organic pigment Substances 0.000 description 4
- 239000000975 dye Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 230000029142 excretion Effects 0.000 description 2
- 239000010871 livestock manure Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 241000283690 Bos taurus Species 0.000 description 1
- OKTJSMMVPCPJKN-IGMARMGPSA-N Carbon-12 Chemical class [12C] OKTJSMMVPCPJKN-IGMARMGPSA-N 0.000 description 1
- 241000283086 Equidae Species 0.000 description 1
- 241000287828 Gallus gallus Species 0.000 description 1
- 108010085603 SFLLRNPND Proteins 0.000 description 1
- 241000282887 Suidae Species 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000013330 chicken meat Nutrition 0.000 description 1
- 239000006103 coloring component Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Abstract
【課題】オゾンを効率的に利用して、畜産排水の脱色を極めて効果的に行うことができる畜産排水処理方法を提供すること。
【解決手段】畜産排水を、前処理槽２及び主処理槽３に順次導入して処理する畜産排水の処理方法であって、主処理槽３において、オゾン発生装置４により発生させたオゾンを利用してメイン処理を行うと共に、前処理槽２において、処理槽３で利用した後の余剰のオゾンを利用して前処理を行う畜産排水処理方法である。
【選択図】図１To provide a livestock wastewater treatment method capable of decolorizing livestock wastewater very effectively by using ozone efficiently.
A livestock wastewater treatment method in which livestock wastewater is sequentially introduced into a pretreatment tank 2 and a main treatment tank 3 for treatment, and ozone generated by an ozone generator 4 is used in the main treatment tank 3. The livestock wastewater treatment method in which the main treatment is performed and the pretreatment tank 2 performs the pretreatment using the surplus ozone after being used in the treatment tank 3.
[Selection] Figure 1
Description
本発明は、オゾンを利用した畜産排水処理方法及び畜産排水処理システムに関する。 The present invention relates to a livestock wastewater treatment method and a livestock wastewater treatment system using ozone.
近年、畜産業を取り巻く環境悪化に伴い、平成１６年に「家畜排せつ物の管理の適正化および利用の促進に関する法律（家畜排せつ物法）」が完全施行された。しかし、家畜排せつ物法が施行されてもなお、畜産業に関する苦情件数は減少しておらず、ここ数年横ばい傾向である。その苦情原因のひとつとして、畜産排水を河川放流することに由来する水質汚濁が挙げられる。畜産排水は、生物処理後、河川放流されるのが一般的であるが、生物処理では色度成分（有機系色素）やＣＯＤを十分除去できないことから水質汚濁が生じている。このような事例は畜産県で多くみられ、自治体により排水基準に加え、色度などに独自の基準を設ける対策が進んでいる。 In recent years, with the deterioration of the environment surrounding the livestock industry, the “Law Concerning the Appropriate Management of Livestock Excretion and Promotion of Use (Livestock Excretion Act)” was fully enforced. However, even after the Livestock Exclusion Act was enforced, the number of complaints about the livestock industry has not decreased and has been flat for the past few years. One of the causes of complaints is water pollution resulting from the release of livestock wastewater into rivers. In general, livestock wastewater is discharged into rivers after biological treatment. However, biological treatment causes water pollution because chromaticity components (organic pigments) and COD cannot be sufficiently removed. Such cases are often seen in livestock prefectures, and measures are underway by local governments to establish their own standards for chromaticity in addition to drainage standards.
このような状況下、従来より、排水の脱色を目的とした処理方法として、活性炭による吸着処理方法や触媒酸化方法の他、オゾンを用いた脱色方法が提案されている。オゾンを用いた脱色処理方法としては、例えば、排水１リットルに対してオゾンが１０〜２００ｍｇとなる量のオゾン化酸素を、排水に吹き込み混合して排水をオゾン酸化処理し、排水の脱色を連続的に行う方法が提案されている（特許文献１参照）。しかしながら、この方法は、高濃度のオゾンを用いるにもかかわらず、十分な脱色効果を必ずしも得ることができない。 Under such circumstances, conventionally, as a treatment method aiming at decolorization of wastewater, a decolorization method using ozone is proposed in addition to an adsorption treatment method using activated carbon and a catalytic oxidation method. As a decoloring treatment method using ozone, for example, ozone-oxidized oxygen in an amount of 10 to 200 mg of ozone per 1 liter of waste water is blown into and mixed with the waste water, and the waste water is subjected to ozone oxidation treatment. An automatic method has been proposed (see Patent Document 1). However, this method cannot always obtain a sufficient decoloring effect despite the use of high-concentration ozone.
また、生物処理の後に、オゾンの存在下において紫外線を照射して有機系色素を酸化処理する方法が提案されている（特許文献２参照）。しかしながら、この方法は、紫外線照射を必要とするため、装置が大型化し、ランニングコストも増大するという問題がある。 Further, a method has been proposed in which an organic dye is oxidized by irradiating ultraviolet rays in the presence of ozone after biological treatment (see Patent Document 2). However, since this method requires ultraviolet irradiation, there is a problem that the apparatus becomes large and the running cost increases.
本発明の課題は、オゾンを効率的に利用して、畜産排水の脱色を極めて効果的に行うことができる畜産排水処理方法及び畜産排水処理システムを提供することにある。 An object of the present invention is to provide a livestock wastewater treatment method and a livestock wastewater treatment system that can effectively decolorize livestock wastewater by efficiently using ozone.
本発明者らは、これまで、養豚し尿排水等の脱色を目的としたオゾン処理による有機色素（着色成分）の分解除去について検討してきた。オゾン処理により難分解性の有機色素を分解して脱色が可能なことは知られているが、オゾンの有効利用及び脱色効率という点からの研究はあまり進んでいない。そこで、本発明者らは、オゾンの有効利用及び脱色効率という点からさらに研究を進めた結果、オゾンを利用した主処理を行う主処理槽の上流側に配置された前処理槽に、主処理槽で利用した後の余剰のオゾンを導入して、予め低濃度でのオゾンを利用した前処理を行うことにより、オゾンを有効に利用できるだけでなく、短時間で処理することができ、さらには、排水の脱色効果が飛躍的に向上することを見い出し、本発明を完成するに至った。 The inventors of the present invention have so far studied the decomposition and removal of organic pigments (coloring components) by ozone treatment for the purpose of decolorizing pig farm wastewater and the like. Although it is known that decolorization can be achieved by decomposing a hard-to-decompose organic dye by ozone treatment, research from the point of view of effective use of ozone and decolorization efficiency has not progressed much. Therefore, as a result of further research from the viewpoint of effective use of ozone and decoloration efficiency, the present inventors have conducted a main treatment in a pretreatment tank disposed upstream of a main treatment tank that performs a main treatment using ozone. By introducing surplus ozone after use in the tank and pre-treatment using ozone at a low concentration in advance, not only can ozone be used effectively, but it can be processed in a short time, and The present inventors have found that the decolorization effect of the waste water is greatly improved and have completed the present invention.
すなわち本発明は、（１）畜産排水を、前処理槽及び主処理槽に順次導入して処理する畜産排水の処理方法であって、主処理槽において、オゾン発生装置で生成させたオゾンを利用して主処理を行うと共に、前処理槽において、主処理槽で利用した後の余剰のオゾンを利用して前処理を行うことを特徴とする畜産排水処理方法や、（２）畜産排水中のオゾン濃度が１００〜７００ｇ／ｍ３となるように、主処理槽にオゾンを導入することを特徴とする上記（１）請求項１に記載の畜産排水処理方法や、（３）前処理槽及び主処理槽において、エアレータを用いてオゾン曝気処理を行うことを特徴とする上記（１）又は（２）に記載の畜産排水処理方法や、（４）畜産排水が、生物処理が施された畜産排水であることを特徴とする上記（１）〜（３）のいずれかに記載の畜産排水処理方法に関する。 That is, the present invention is (1) a livestock wastewater treatment method in which livestock wastewater is sequentially introduced into a pretreatment tank and a main treatment tank, and uses ozone generated by an ozone generator in the main treatment tank. In the pretreatment tank, the livestock wastewater treatment method is characterized by pretreatment using surplus ozone after being used in the main treatment tank, and (2) Ozone is introduced into the main treatment tank so that the ozone concentration is 100 to 700 g / m 3 , (1) the livestock wastewater treatment method according to claim 1, (3) a pretreatment tank, and In the main treatment tank, ozone aeration treatment is performed using an aerator, and the livestock wastewater treatment method according to (1) or (2) above, or (4) livestock wastewater subjected to biological treatment. The above (1) to characterized by being drainage It is related with the livestock wastewater treatment method in any one of (3).
また本発明は、（５）畜産排水が、畜産し尿排水であることを特徴とする上記（１）〜（４）のいずれかに記載の畜産排水処理方法や、（６）畜産排水の脱色を行うことを特徴とする上記（１）〜（５）のいずれかに記載の畜産排水処理方法や、（７）畜産排水を収容する畜産排水貯留槽と、該畜産排水貯留槽の下流に配置されたオゾンを利用して前処理を行う前処理槽と、該前処理槽の下流に配置されたオゾンを利用して主処理を行う主処理槽と、オゾンを生成するオゾン発生装置とを備え、前記畜産排水貯留槽から前処理槽及び主処理槽に畜産排水を順次導入して処理するシステムであって、前記オゾン発生装置で生成したオゾンを主処理槽に導入する生成オゾン導入手段と、前記主処理槽で利用した後の余剰のオゾンを前処理槽に導入する余剰オゾン導入手段とを備えたことを特徴とする畜産排水処理システムや、（８）さらに生物処理施設を備えたことを特徴とする上記（７）に記載の畜産排水処理システムに関する。 Moreover, this invention is the livestock wastewater treatment method in any one of said (1)-(4) characterized by (5) livestock wastewater being livestock and urine wastewater, (6) Decolorization of livestock wastewater The livestock wastewater treatment method according to any one of the above (1) to (5), (7) a livestock wastewater storage tank for storing livestock wastewater, and a downstream of the livestock wastewater storage tank, A pretreatment tank for pretreatment using ozone, a main treatment tank for main treatment using ozone disposed downstream of the pretreatment tank, and an ozone generator for generating ozone, A system for sequentially introducing and treating livestock wastewater from the livestock wastewater storage tank to a pretreatment tank and a main treatment tank, wherein the generated ozone introduction means introduces ozone generated by the ozone generator into the main treatment tank, and Excess ozone after being used in the main treatment tank is introduced into the pretreatment tank That and livestock waste water treatment system is characterized in that a surplus ozone introducing means, to livestock wastewater treatment system according to the above (7), characterized in that it further comprises a biological treatment plant (8).
本発明の畜産排水処理方法及び畜産排水処理システムによれば、オゾンを効率的に利用して、畜産排水の脱色を極めて効果的に行うことができる。 According to the livestock wastewater treatment method and livestock wastewater treatment system of the present invention, decolorization of livestock wastewater can be performed very effectively by using ozone efficiently.
本発明の畜産排水処理方法としては、畜産排水を、前処理槽及び主処理槽に順次導入して処理する畜産排水の処理方法であって、主処理槽において、オゾン発生装置により発生させたオゾンを利用して主処理を行うと共に、前処理槽において、主処理槽で利用した後の余剰のオゾンを利用して前処理を行う処理方法であれば特に制限されるものではなく、本発明の方法により処理する畜産排水としては、牛、豚、鶏、馬等の家畜施設から生じる畜産し尿、飼育廃水等の排水を挙げることができ、畜産し尿は有機色素（着色成分）を多く含むことから、畜産し尿を処理する場合に本発明は特に有効である。 The livestock wastewater treatment method of the present invention is a livestock wastewater treatment method in which livestock wastewater is sequentially introduced into a pretreatment tank and a main treatment tank for treatment, and ozone generated by an ozone generator in the main treatment tank. In the pretreatment tank, the pretreatment tank is not particularly limited as long as it is a treatment method for pretreatment using surplus ozone after use in the main treatment tank. Examples of livestock wastewater treated by the method include livestock manure generated from livestock facilities such as cattle, pigs, chickens, and horses, and wastewater such as breeding wastewater. Livestock manure contains a lot of organic pigments (colored components). The present invention is particularly effective when processing livestock and urine.
また、本発明の処理方法において処理される畜産排水は、畜産排水そのものや、生物処理が施された畜産排水を挙げることができる。すなわち、本発明の処理前及び／又は処理後に生物処理を行うことができる。しかしながら、畜産排水に含まれる有機物の量が少なくオゾンの使用量を抑制することができることから、生物処理が施された畜産排水に対して本発明の処理方法を適用することが好ましい。かかる生物処理としては、散水ろ床法や活性汚泥法等による好気的処理や、メタン発酵法による嫌気的処理等を挙げることができる。生物処理は、好気的処理及び嫌気的処理のいずれか一方の処理であってもよいが、両方の処理であってもよい。両方の処理を行う場合、好気的処理後に嫌気的処理を行ってもよいし、嫌気的処理後に好気的処理を行ってもよい。 Moreover, the livestock wastewater processed in the processing method of this invention can mention livestock wastewater itself and the livestock wastewater to which the biological treatment was performed. That is, biological treatment can be performed before and / or after the treatment of the present invention. However, since the amount of organic matter contained in livestock wastewater is small and the amount of ozone used can be suppressed, it is preferable to apply the treatment method of the present invention to livestock wastewater subjected to biological treatment. Examples of such biological treatment include an aerobic treatment by a trickling filter method, an activated sludge method, and an anaerobic treatment by a methane fermentation method. The biological treatment may be either an aerobic treatment or an anaerobic treatment, but may be both treatments. When both processes are performed, an anaerobic process may be performed after an aerobic process, and an aerobic process may be performed after an anaerobic process.
また、通常分解除去されない畜産排水中の難分解性有機物も分解除去されることから、好気的処理後に本発明の処理を行いさらに好気的処理を行うことや、嫌気的処理後に本発明の処理を行いさらに好気的処理を行うことや、好気的処理後に本発明の処理を行いさらに嫌気的処理を行うことが特に好ましい。 In addition, since persistent organic substances in livestock wastewater that are not normally decomposed and removed are also decomposed and removed, the treatment of the present invention is performed after aerobic treatment, and further aerobic treatment is performed. It is particularly preferable to perform the treatment and further perform the aerobic treatment, or perform the treatment of the present invention after the aerobic treatment and further perform the anaerobic treatment.
まず、主処理槽における主処理について説明する。主処理槽における主処理は、オゾン発生装置により発生させたオゾンを直接利用した処理であって、主処理槽の畜産排水中にオゾンを導入・拡散して行う有機色素を分解するための処理である。主処理槽内の畜産排水へのオゾンの拡散には、一般的な拡散手段を用いることができ、例えば、自吸式又は非自吸式のエアレータ、エゼクター、気液混合ポンプ等を用いることができる。主処理槽における畜産排水中のオゾン導入量としては、畜産排水中のオゾン濃度が、例えば、１〜１０００ｇ／ｍ３、好ましくは１００〜７００ｇ／ｍ３、より好ましくは２５０〜５００ｇ／ｍ３となるように導入する。また、オゾン発生装置としては、無声放電法、電解法、光化学法、高周波電解法、放射線照射法等を用いた従来公知の装置を使用することができる。 First, main processing in the main processing tank will be described. The main treatment in the main treatment tank is a treatment that directly uses ozone generated by an ozone generator, and is a treatment for decomposing organic pigments by introducing and diffusing ozone into the livestock wastewater in the main treatment tank. is there. For the diffusion of ozone into the livestock wastewater in the main treatment tank, general diffusion means can be used, for example, using a self-priming or non-self-priming aerator, ejector, gas-liquid mixing pump, etc. it can. As the amount of ozone introduced into the livestock wastewater in the main treatment tank, the ozone concentration in the livestock wastewater is, for example, 1 to 1000 g / m 3 , preferably 100 to 700 g / m 3 , more preferably 250 to 500 g / m 3 . Introduce as follows. As the ozone generator, a conventionally known apparatus using a silent discharge method, an electrolysis method, a photochemical method, a high frequency electrolysis method, a radiation irradiation method, or the like can be used.
また、前処理槽で行われる前処理とは、主処理槽で利用した後の余剰のオゾンを利用して行う処理であって、前処理槽の畜産排水中にオゾンを導入・拡散して行う処理である。前処理槽内の畜産排水へのオゾンの拡散には、上記主処理槽の場合と同様に、一般的な拡散手段を用いることができる。前処理槽におけるオゾン濃度としては、例えば、主処理が行われる主処理槽の１〜５０％程度であり、１〜３０％程度であることが好ましく、１〜２０％程度であることがより好ましい。かかる前処理は、主処理槽における主処理で余ったオゾンを利用して行うのでオゾンを有効に利用することが可能となる。また、この余剰のオゾンによる前処理を行うことにより、脱色効果が飛躍的に向上し、その効果は、主処理で余ったオゾンで後処理を行うよりもさらに高い。 The pretreatment performed in the pretreatment tank is a treatment performed using surplus ozone after being used in the main treatment tank, and is performed by introducing and diffusing ozone into the livestock wastewater in the pretreatment tank. It is processing. As in the case of the main treatment tank, a general diffusion means can be used for the diffusion of ozone to the livestock wastewater in the pretreatment tank. The ozone concentration in the pretreatment tank is, for example, about 1 to 50% of the main treatment tank in which the main treatment is performed, preferably about 1 to 30%, and more preferably about 1 to 20%. . Such pretreatment is performed using ozone remaining in the main treatment in the main treatment tank, so that ozone can be used effectively. Further, by performing the pretreatment with the surplus ozone, the decoloring effect is greatly improved, and the effect is higher than that in the posttreatment with the surplus ozone in the main treatment.
従来のように、主処理槽のみでオゾン処理する場合には、分解されやすい物質が優先的に分解され、分解されにくい物質が分解される前に余剰オゾンとして反応槽から放出されて、十分な有機物の分解を行うことができない場合があるが、本発明においては、前処理槽において、低濃度のオゾンでも分解が進む比較的分解されやすい物質が優先的に分解されるので、主処理槽内において、分解されにくい物質を有効に処理することができ、全体として非常に効果的に有機色素等の有機物の分解処理を行うことができる。 When the ozone treatment is performed only in the main treatment tank as in the prior art, a substance that is easily decomposed is preferentially decomposed, and a substance that is difficult to decompose is released from the reaction tank as surplus ozone before being decomposed. In some cases, the organic matter cannot be decomposed. However, in the present invention, in the pretreatment tank, a relatively easy to decompose substance that decomposes even with a low concentration of ozone is preferentially decomposed. In this case, it is possible to effectively treat substances that are difficult to be decomposed, and as a whole, it is possible to very effectively decompose organic substances such as organic dyes.
本発明における前処理を行う前処理槽は、１つの主処理槽に対して、１又は２以上設けることができ、２以上設ける場合、それらの処理槽は、直列的であってもよいし、並列的であってもよく、並列的である場合には、主処理槽からのオゾンはその容量に応じて均等に振り分けることが好ましく、直列的である場合には、主処理槽から上流側に向かって順次導入することが、より脱色効果を高めることができることから好ましい。 One or two or more pretreatment tanks for pretreatment in the present invention can be provided for one main treatment tank, and when two or more are provided, these treatment tanks may be in series, It may be parallel, and in the case of parallel, it is preferable to distribute the ozone from the main processing tank evenly according to its capacity, and in the case of serial, upstream from the main processing tank. Sequential introduction is preferable because the decoloring effect can be further enhanced.
また、本発明の畜産排水処理システムとしては、畜産排水を収容する畜産排水貯留槽と、該畜産排水貯留槽の下流に配置されたオゾンを利用して前処理を行う前処理槽と、該前処理槽の下流に配置されたオゾンを利用して主処理を行う主処理槽と、オゾンを生成するオゾン発生装置とを備え、前記畜産排水貯留槽から前処理槽及び主処理槽に畜産排水を順次導入して処理するシステムであって、前記オゾン発生装置で生成したオゾンを主処理槽に導入する生成オゾン導入手段と、前記主処理槽で利用した後の余剰のオゾンを前処理槽に導入する余剰オゾン導入手段とを備えたシステムであれば特に制限されるものではなく、さらに生物処理施設を備えていてもよく、本発明の畜産排水処理システムは、上記本発明の畜産排水処理方法を実施するために用いることができる。 The livestock wastewater treatment system of the present invention includes a livestock wastewater storage tank that stores livestock wastewater, a pretreatment tank that performs pretreatment using ozone disposed downstream of the livestock wastewater storage tank, A main treatment tank for performing main treatment using ozone disposed downstream of the treatment tank and an ozone generator for generating ozone are provided, and livestock wastewater is discharged from the livestock wastewater storage tank to the pretreatment tank and the main treatment tank. A system that sequentially introduces and processes the generated ozone introduction means that introduces ozone generated by the ozone generator into the main treatment tank, and introduces excess ozone after being used in the main treatment tank into the pretreatment tank If it is a system provided with the surplus ozone introduction means to perform, it will not be restricted in particular, and it may be further provided with a biological treatment facility, and the livestock wastewater treatment system of the present invention is the livestock wastewater treatment method of the present invention. Carry out It can be used for.
以下、図面を用いて本発明の畜産排水処理方法を実施可能な本発明の畜産排水処理システムを説明する。図１は、本発明の畜産排水処理システムの一例を示す概略図である。 Hereinafter, the livestock wastewater treatment system of the present invention capable of implementing the livestock wastewater treatment method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing an example of a livestock wastewater treatment system of the present invention.
図１に示すように、本発明の畜産排水処理システムは、畜産排水を収容する畜産排水貯留槽１と、畜産排水貯留槽１の下流に配置されたオゾンを用いた前処理するための前処理槽２と、前処理槽２の下流に配置されたオゾンを用いて主処理するための主処理槽３と、主処理槽３に導入するオゾンを生成するためのオゾン発生装置４とを備えている。 As shown in FIG. 1, the livestock wastewater treatment system of the present invention is a livestock wastewater storage tank 1 that houses livestock wastewater, and a pretreatment for pretreatment using ozone disposed downstream of the livestock wastewater storage tank 1. A tank 2, a main treatment tank 3 for main treatment using ozone disposed downstream of the pretreatment tank 2, and an ozone generator 4 for generating ozone to be introduced into the main treatment tank 3 are provided. Yes.
かかるシステムを用いた畜産排水の脱色処理は、畜産排水貯留槽１に収容された生物処理後の畜産排水をポンプ５で前処理槽２に導入し、次いで、ポンプ６で主処理槽３に導入して行われる。主処理槽３においては、オゾン発生装置４から生成オゾン導入手段によって導入された高濃度のオゾンを利用した処理（主処理）が行われ、前処理槽２においては、主処理槽３から余剰オゾン導入手段によって導入された低濃度の余剰オゾンを利用した処理（前処理）が行われる。なお、畜産排水の移送は自然流下であってもよい。 In the decolorization treatment of livestock wastewater using such a system, the livestock wastewater after biological treatment accommodated in the livestock wastewater storage tank 1 is introduced into the pretreatment tank 2 by the pump 5 and then introduced into the main treatment tank 3 by the pump 6. Done. In the main treatment tank 3, a treatment (main treatment) using high-concentration ozone introduced from the ozone generator 4 by the produced ozone introduction means is performed, and in the pretreatment tank 2, surplus ozone from the main treatment tank 3. A treatment (pretreatment) using surplus ozone at a low concentration introduced by the introduction means is performed. The livestock wastewater may be transferred naturally.
具体的には、オゾン発生装置４において、コンプレッサー等の送気装置７により導入された空気中の酸素をオゾンに変換し、ここで生成されたオゾン濃度をオゾンモニタ８にて検知した後、主処理槽３に送り込む。主処理槽３においては、例えば下部に設置されたオゾン拡散装置により畜産排水内にオゾンが拡散され、高濃度のオゾンによる曝気処理が行われる。主処理槽３においては、処理に使用されなかった余剰のオゾンが発生するが、このオゾンを回収し、ウォータートラップ９及びオゾンモニタ１０を経て、前処理槽２内に導入する。前処理槽２においては、主処理槽３と同様に、オゾン拡散装置により畜産排水内にオゾンが拡散され、低濃度のオゾンによる曝気処理（前処理）が行われる。すなわち、前処理槽２において、比較的低い濃度のオゾンによって処理する前処理が行われ、その後の主処理槽３において、高い濃度のオゾンによって主処理が行われる。これらの処理により、着色している畜産排水は効果的に脱色される。なお、オゾン拡散装置を自吸のエアレータにする場合は、コンプレッサー等の送気装置は不要である。 Specifically, in the ozone generator 4, oxygen in the air introduced by the air supply device 7 such as a compressor is converted into ozone, and the ozone concentration generated here is detected by the ozone monitor 8. Feed into the treatment tank 3. In the main treatment tank 3, for example, ozone is diffused into the livestock wastewater by an ozone diffusion device installed in the lower part, and aeration treatment with high-concentration ozone is performed. In the main treatment tank 3, surplus ozone that has not been used for the treatment is generated. This ozone is collected and introduced into the pretreatment tank 2 through the water trap 9 and the ozone monitor 10. In the pretreatment tank 2, similarly to the main treatment tank 3, ozone is diffused into the livestock wastewater by the ozone diffusion device, and aeration treatment (pretreatment) with low-concentration ozone is performed. That is, the pretreatment is performed in the pretreatment tank 2 with a relatively low concentration of ozone, and the main treatment is performed in the subsequent main treatment tank 3 with a high concentration of ozone. By these treatments, the colored livestock wastewater is effectively decolorized. When the ozone diffusion device is a self-priming aerator, an air supply device such as a compressor is not necessary.
なお、前処理槽２においては、ほとんどのオゾンが消費されることとなるが、未消費のオゾンは、ウォータートラップ１１で水分が回収された後、活性炭１２で吸着処理され、オゾンモニタ１３で確認後に、大気に放流される。本発明においては、前処理槽２の数や容量を調整する等、すべての導入オゾンを処理槽で消費できるように構成することもでき、その場合、活性炭等のオゾン回収手段を省略することができる。 In the pretreatment tank 2, most of the ozone is consumed, but the unconsumed ozone is adsorbed by the activated carbon 12 after being collected by the water trap 11 and confirmed by the ozone monitor 13. Later, it is released into the atmosphere. In the present invention, it can be configured so that all introduced ozone can be consumed in the processing tank, such as adjusting the number and capacity of the pretreatment tank 2, and in that case, ozone recovery means such as activated carbon may be omitted. it can.
以下、実施例により本発明をより具体的に説明するが、本発明の技術的範囲はこれらの例示に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, the technical scope of this invention is not limited to these illustrations.
実施例に係る処理として、図１に示されるのと同様のシステムを用いて、一般的な生物処理が施された畜産排水（色度３００（度）：３９０ｎｍ）を処理した。容積８０Ｌの前処理槽２及び主処理槽３に畜産排水を８０Ｌ収容して、８０Ｌ／ｈの流速で畜産排水を処理した。主処理槽３に対して、オゾン発生装置により生成したオゾンを８ｇ／ｈ導入し、主処理槽３で回収された余剰のオゾンを前処理槽２に導入して処理を行った。 As processing according to the example, livestock wastewater (chromaticity 300 (degrees): 390 nm) subjected to general biological treatment was processed using the same system as shown in FIG. 80 L of livestock wastewater was accommodated in the pretreatment tank 2 and the main treatment tank 3 having a capacity of 80 L, and the livestock wastewater was processed at a flow rate of 80 L / h. 8 g / h of ozone generated by the ozone generator was introduced into the main treatment tank 3, and surplus ozone collected in the main treatment tank 3 was introduced into the pretreatment tank 2 for processing.
比較例に係る処理として、前処理槽２では通常の空気による曝気処理を行い、主処理槽３ではオゾン発生装置からのオゾンを利用して主処理を行うよう構成した処理システムを用いて、オゾンの導入量は実施例と同様にして畜産排水の処理を行った（比較例１）。また、オゾン発生装置からのオゾンをまず前処理槽２に導入し、余剰のオゾンを主処理槽３に導入するよう構成した処理システムを用い、その他の条件は実施例と同様にして、畜産排水の処理を行った（比較例２）。 As a process according to the comparative example, the pretreatment tank 2 performs an aeration process with normal air, and the main treatment tank 3 uses a treatment system configured to perform a main process using ozone from an ozone generator. The amount of introduced was treated with livestock wastewater in the same manner as in Example (Comparative Example 1). In addition, using a treatment system configured to first introduce ozone from the ozone generator into the pretreatment tank 2 and introduce excess ozone into the main treatment tank 3, the other conditions are the same as in the embodiment, and the livestock wastewater (Comparative Example 2).
実施例に係る処理方法においては、前処理槽で約１５％の脱色が行われ、前処理槽と主処理槽まとめて約９０％の脱色が行われた。実施例に係る処理方法で処理された処理排水と、比較例に係る処理方法で処理された処理排水とを比較すると、オゾンの使用量は同一であるにもかかわらず、実施例に係る処理方法が、効率的に脱色が行われた。 In the treatment method according to the example, decolorization of about 15% was performed in the pretreatment tank, and about 90% of the decolorization was performed in the pretreatment tank and the main treatment tank. Comparing the treated wastewater treated with the treatment method according to the example and the treated wastewater treated with the treatment method according to the comparative example, the amount of ozone used is the same, but the treatment method according to the example However, the decolorization was performed efficiently.
１ 畜産排水貯留槽
２ 前処理槽
３ 主処理槽
４ オゾン発生装置
５，６ ポンプ
７ 送気装置（コンプレッサー）
８，１０，１３ オゾンモニタ
９，１１ ウォータートラップ
１２ 活性炭
DESCRIPTION OF SYMBOLS 1 Livestock wastewater storage tank 2 Pretreatment tank 3 Main treatment tank 4 Ozone generator 5,6 Pump 7 Air supply device (compressor)
8, 10, 13 Ozone monitor 9, 11 Water trap 12 Activated carbon
Claims (8)
主処理槽において、オゾン発生装置で生成させたオゾンを利用して主処理を行うと共に、前処理槽において、主処理槽で利用した後の余剰のオゾンを利用して前処理を行うことを特徴とする畜産排水処理方法。 A livestock wastewater treatment method for sequentially introducing and treating livestock wastewater into a pretreatment tank and a main treatment tank,
In the main treatment tank, the main treatment is performed using the ozone generated by the ozone generator, and in the pretreatment tank, the pretreatment is performed using the surplus ozone after being used in the main treatment tank. Livestock wastewater treatment method.
前記オゾン発生装置で生成したオゾンを主処理槽に導入する生成オゾン導入手段と、前記主処理槽で利用した後の余剰のオゾンを前処理槽に導入する余剰オゾン導入手段とを備えたことを特徴とする畜産排水処理システム。 A livestock wastewater storage tank for storing livestock wastewater, a pretreatment tank for pretreatment using ozone disposed downstream of the livestock wastewater storage tank, and ozone disposed downstream of the pretreatment tank A main treatment tank that performs main treatment and an ozone generator that generates ozone, and sequentially introduces and processes livestock wastewater from the livestock wastewater storage tank to the pretreatment tank and the main treatment tank,
Producing ozone introducing means for introducing ozone generated by the ozone generator into the main treatment tank, and surplus ozone introducing means for introducing surplus ozone after being used in the main treatment tank to the pretreatment tank. Characteristic livestock wastewater treatment system.
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| JP2001047096A (en) * | 1999-08-13 | 2001-02-20 | Kuniaki Horikoshi | Apparatus and method for excretion |
| WO2001030706A1 (en) * | 1999-10-28 | 2001-05-03 | Kazuto Hashizume | Improved method and apparatus for water treatment |
| JP2002001366A (en) * | 2000-06-19 | 2002-01-08 | Nomura Micro Sci Co Ltd | Method and system for treating organic substance in water |
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| JP2020131099A (en) * | 2019-02-18 | 2020-08-31 | 株式会社Ihi | Water treatment apparatus and water treatment method |
| JP7225894B2 (en) | 2019-02-18 | 2023-02-21 | 株式会社Ihi | Water treatment device and water treatment method |
| CN117945536A (en) * | 2024-02-28 | 2024-04-30 | 福建省晋蓝环保股份有限公司 | A decolorization reaction system and decolorization process for improving ozone utilization |
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