JP3483092B2 - Treatment method for wastewater containing persistent organic matter - Google Patents
Treatment method for wastewater containing persistent organic matterInfo
- Publication number
- JP3483092B2 JP3483092B2 JP21268296A JP21268296A JP3483092B2 JP 3483092 B2 JP3483092 B2 JP 3483092B2 JP 21268296 A JP21268296 A JP 21268296A JP 21268296 A JP21268296 A JP 21268296A JP 3483092 B2 JP3483092 B2 JP 3483092B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- oxidative decomposition
- water
- wastewater
- organic matter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000002351 wastewater Substances 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 20
- 239000005416 organic matter Substances 0.000 title claims description 16
- 230000002085 persistent effect Effects 0.000 title description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 238000006864 oxidative decomposition reaction Methods 0.000 claims description 35
- 239000007800 oxidant agent Substances 0.000 claims description 33
- 230000001590 oxidative effect Effects 0.000 claims description 18
- 238000002835 absorbance Methods 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 13
- 238000007865 diluting Methods 0.000 claims description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 19
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 7
- 229910052753 mercury Inorganic materials 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000006552 photochemical reaction Methods 0.000 description 3
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- ZJRXSAYFZMGQFP-UHFFFAOYSA-N barium peroxide Chemical compound [Ba+2].[O-][O-] ZJRXSAYFZMGQFP-UHFFFAOYSA-N 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- AXZAYXJCENRGIM-UHFFFAOYSA-J dipotassium;tetrabromoplatinum(2-) Chemical compound [K+].[K+].[Br-].[Br-].[Br-].[Br-].[Pt+2] AXZAYXJCENRGIM-UHFFFAOYSA-J 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 description 1
- 229910001487 potassium perchlorate Inorganic materials 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Physical Water Treatments (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、生物処理による分
解が困難な難分解性有機物含有排水を紫外線などの光線
と酸化剤を併用して処理する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a wastewater containing a hardly decomposable organic substance, which is difficult to decompose by biological treatment, by using rays such as ultraviolet rays and an oxidizing agent in combination.
【０００２】[0002]
【従来の技術】生物処理による分解が困難な難分解性有
機物含有排水には、フミン酸、リグニン等を含んだ屎尿
の生物処理水、ゴミ埋立て地浸出水の生物処理水等があ
る。この様な難分解性有機物含有排水の従来の処理方法
として、凝集沈殿処理、活性炭処理、あるいはフェント
ン反応を利用したフェントン処理、オゾンの酸化力を利
用したオゾン処理等が知られている。又光化学的反応あ
るいは化学反応によって、ヒドロキシラジカル等の活性
種を発生させ、有機物を酸化分解する方法も知られてい
る。2. Description of the Related Art Wastewater containing hardly decomposable organic substances that is difficult to decompose by biological treatment includes biologically treated water of human waste containing humic acid, lignin and the like, biologically treated water of leachate from a landfill. As a conventional treatment method for such wastewater containing hardly decomposable organic matter, coagulation sedimentation treatment, activated carbon treatment, Fenton treatment utilizing Fenton reaction, ozone treatment utilizing oxidizing power of ozone, and the like are known. Also known is a method of generating active species such as hydroxy radicals by photochemical reaction or chemical reaction to oxidatively decompose organic substances.
【０００３】[0003]
【発明が解決しようとする課題】これらの方法の中で
も、光化学的反応によってヒドロキシラジカルのような
活性種を発生させる方法は、他に類を見ない強力な酸化
力を有していることが知られている。しかしながら、処
理すべき排水（原水）は、通常、紫外線等の光線透過率
が低く、その結果光線照射に係るエネルギー供給量当り
の活性種発生量が少なくなってしまうという問題点があ
った。本発明は、このような従来の課題に鑑みてなされ
たものであり、光化学的反応によってヒドロキシラジカ
ルのような活性種を発生させる方法において、光線照射
に係るエネルギー供給量当りの活性種発生量を増大さ
せ、低コストで処理可能な難分解性有機物含有排水の処
理方法を提供することを目的とするものである。Among these methods, the method of generating an active species such as a hydroxy radical by a photochemical reaction is known to have a uniquely strong oxidizing power. Has been. However, the waste water (raw water) to be treated usually has a low light transmittance of ultraviolet rays and the like, and as a result, there has been a problem that the amount of active species generated per energy supply amount related to light irradiation is reduced. The present invention has been made in view of such conventional problems, in the method of generating active species such as hydroxy radicals by photochemical reaction, the active species generation amount per energy supply amount related to light irradiation It is an object of the present invention to provide a method for treating wastewater containing a persistent organic substance, which is increased and can be treated at low cost.
【０００４】[0004]
【課題を解決するための手段】上記課題は、次に手段に
より解決された。
（１） 難分解性有機物含有排水を酸化分解槽中で光線
と酸化剤を併用して物理化学的に処理する方法におい
て、光照射工程へ処理水の一部を循環することにより前
記難分解性有機物含有排水を希釈せしめた後、それに光
照射を行うとともに、前記酸化分解槽として水層の厚さ
がＬｃｍである酸化分解槽を使用し、原水の１ｃｍ当り
の光線吸光度（Ａ０）、処理済み排水の１ｃｍ当りの光
線吸光度（Ａ１）及び酸化分解槽への流入時点での酸化
剤濃度における酸化剤の１ｃｍ当りの光線吸光度（Ａ
２）を測定し、これらの測定値に基づき、酸化分解槽へ
の処理水循環率Ｒを下式に示す関係に維持することを特
徴とする難分解性有機物含有排水の処理方法。〔−１×（Ａ０＋Ａ２−１．５３／Ｌ）／（Ａ１＋Ａ２
−１．５３／Ｌ）〕≦Ｒ≦２
（２）前記光線が波長１８０〜２６０ｎｍの紫外線であ
ることを特徴とする前記（１）項記載の難分解性有機物
含有排水の処理方法。 The above-mentioned problems have been solved by the following means. (1) In a method of physicochemically treating a wastewater containing a hardly decomposable organic substance by using a light ray and an oxidant together in an oxidative decomposition tank, a part of the treated water is circulated to a light irradiation step so that the hardly decomposed After diluting the organic matter-containing wastewater, it is irradiated with light and the thickness of the water layer is used as the oxidative decomposition tank.
Per cm of raw water using an oxidative decomposition tank with Lcm
Absorbance of light (A0), light per cm of treated wastewater
Line absorbance (A1) and oxidation at the time of flowing into the oxidative decomposition tank
Absorbance of light per cm of oxidizer at agent concentration (A
2) is measured and based on these measured values, it is sent to the oxidative decomposition tank.
The method for treating hardly-decomposable organic matter-containing wastewater, characterized in that the treated water circulation rate R is maintained in the relationship shown below . [-1 × (A0 + A2-1.53 / L) / (A1 + A2
−1.53 / L)] ≦ R ≦ 2 (2) The light rays are ultraviolet rays having a wavelength of 180 to 260 nm.
Wherein (1) how to process the low-degradable organic substances containing wastewater according to claim, characterized in that that.
【０００５】[0005]
【発明の実施の形態】このような構成とすることによ
り、本発明では、難分解性有機物含有排水は、酸化分解
槽へ導入される時に、紫外線等の光線と酸化剤の併用に
よる酸化分解を受けるに当たり、処理水の一部が排水
（被処理原水）中へ特定の循環率で返戻されることによ
り、原水が希釈化されて難分解性有機物の濃度が低下す
るために、原水の光線透過率が高められ、それにより光
線照射エネルギー当りの酸化剤励起量を好適に増加さ
せ、酸化分解効率を向上させることができる。従来のよ
うに、単に原水に紫外線等の光線を照射された場合に
は、原水中の難分解性有機物の濃度が高いために、光線
はこの有機物に吸収されてしまい、光線透過率が低く、
反応に有効な酸化剤に吸収される率が低く、酸化剤を活
性化させる割合が低いために反応が十分に進行しない
が、本発明においては希釈することにより紫外線等の光
線を酸化剤に十分吸収させることができる。ただし、処
理水の循環率を大きくしすぎると、有機物の濃度が過度
に低くなることにより、励起された酸化剤量と酸化分
解可能な有機物量との比（／）が大きくなり過ぎ
てしまい、励起された酸化剤の大部分が有機物を酸化分
解することなく、無効に消滅してしまうので、その循環
率は前記した範囲とすることが好適である。According to the present invention, the hardly decomposable organic substance-containing wastewater is oxidatively decomposed by the combined use of light rays such as ultraviolet rays and an oxidant when being introduced into the oxidative decomposition tank. Upon receiving it, part of the treated water is returned to the wastewater (raw water to be treated) at a specific circulation rate, which dilutes the raw water and reduces the concentration of persistent organic matter. The rate is increased, whereby the amount of oxidant excitation per light irradiation energy can be suitably increased, and the oxidative decomposition efficiency can be improved. As in the conventional case, when the raw water is simply irradiated with light rays such as ultraviolet rays, the concentration of the hardly decomposable organic matter in the raw water is high, so the light rays are absorbed by this organic matter, and the light transmittance is low,
Since the rate of absorption by an oxidant effective for the reaction is low and the rate of activating the oxidant is low, the reaction does not proceed sufficiently, but in the present invention, by diluting, rays such as ultraviolet rays are sufficiently absorbed by the oxidant. Can be absorbed. However, if the circulation rate of the treated water is too large, the concentration of the organic matter becomes excessively low, and the ratio (/) of the amount of the excited oxidant and the amount of the oxidatively decomposable organic matter becomes too large. Since most of the excited oxidant disappears ineffectively without oxidatively decomposing the organic substance, it is preferable that the circulation rate is within the above range.
【０００６】 以下、本発明に係る難分解性有機物含有
排水の処理方法について詳細に説明する。本発明におい
て、循環率Ｒの範囲は、本発明者らが実験によって最も
効果的なものとして知見したものである。すなわち、Ｒ
が〔−１×（Ａ０＋Ａ２−１．５３／Ｌ）／（Ａ１＋Ａ
２−１．５３／Ｌ）〕未満では、紫外線等の光線によっ
て励起されない酸化剤の量が増大し、光線照射に係るエ
ネルギー供給量当りの酸化分解効率が低下する。一方、
Ｒが２を越えると、単位処理当りの消費エネルギーが過
大となり、酸化分解効率が低下する。なお、循環率Ｒ
は、（循環水流量）／（原水流量）である。 Hereinafter, the method for treating the wastewater containing a persistent organic substance according to the present invention will be described in detail. In the present invention, the range of the circulation rate R has been found by the present inventors to be the most effective one through experiments. That is, R
Is [-1 × (A 0 + A 2 −1.53 / L) / (A 1 + A
In less than 2 -1.53 / L)], the amount of oxidizing agent that is not excited by light such as ultraviolet light is increased, oxidative decomposition efficiency of energy supply per according to light irradiation is reduced. on the other hand,
When R exceeds 2, the energy consumption per unit treatment becomes excessive and the oxidative decomposition efficiency decreases. The circulation rate R
Is (circulation water flow rate) / (raw water flow rate).
【０００７】 本発明における酸化剤としては、酸化作
用を持つ物質であれば特に限定されることなく使用でき
る。酸化剤の具体的な例としては、
（１）空気、酸素、オゾン、
（２）過マンガン酸カリウム、重クロム酸カリウム、
（３）過酸化水素、過酸化バリウム、過酸化ベンゾール
などの過酸化物、
（４）塩素酸カリウム、過塩素酸カリウムなどの塩素酸
塩、
などが例示され、これらを単独で或いは併用して使用す
ることができる。使用上の安全性、装置の腐食の問題、
処理排水の後処理の容易さ等を考慮すると過酸化水素、
オゾン、次亜塩素酸ソーダが好ましい酸化剤と言える。
又、酸化剤の濃度は、処理効率を考慮すると、原水のＣ
ＯＤの１〜５倍等量であることが望ましい。The oxidizing agent in the present invention is not particularly limited as long as it is a substance having an oxidizing action. Specific examples of the oxidizing agent include (1) air, oxygen, ozone, (2) potassium permanganate, potassium dichromate, (3) hydrogen peroxide, barium peroxide, benzol peroxide, and other peroxides. (4) Chloric acid such as potassium chlorate and potassium perchlorate
Examples thereof include salts, and these can be used alone or in combination. Safety in use, equipment corrosion issues,
Considering the ease of post-treatment of treated wastewater, hydrogen peroxide,
Ozone and sodium hypochlorite are preferred oxidizing agents.
Also, considering the treatment efficiency, the concentration of the oxidizing agent is C of raw water.
It is preferably 1 to 5 times the OD.
【０００８】本発明における酸化分解に使用する光線は
紫外線、可視光線を問わず、上記の酸化剤を励起可能な
光線であれば好適に使用することができる。照射用光線
の光源としては、低圧水銀ランプ、中圧水銀ランプ、高
圧水銀ランプ、エキシマレーザー、自然光、蛍光灯を挙
げることができる。しかしながら、化学線とも称される
紫外線を放射する光源が酸化剤の励起効率の点から好ま
しく、特に酸化剤を励起する効率が高い波長１８０〜２
６０nmの光線を主に放射する低圧水銀灯が石英ガラス透
過率の高さとも相俟って特に好ましい光源である。The light used for the oxidative decomposition in the present invention may be either ultraviolet light or visible light, and any light capable of exciting the above-mentioned oxidizing agent can be preferably used. Examples of the light source of the irradiation light beam include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an excimer laser, natural light, and a fluorescent lamp. However, a light source that emits ultraviolet rays, which is also called actinic radiation, is preferable from the viewpoint of the excitation efficiency of the oxidant, and particularly a wavelength of 180 to 2 that has a high efficiency of exciting the oxidant.
A low-pressure mercury lamp that mainly emits light of 60 nm is a particularly preferable light source in combination with the high transmittance of quartz glass.
【０００９】又、酸化分解槽の型式としては、いわゆる
タンク型、貫流型を問わず水層厚を有するあらゆる型式
の槽が使用できる。なお、本明細書における水層厚と
は、紫外線等の光線が実際に透過する被処理水等の水層
の厚さのことを言う。さらに、原水、処理水、及び酸化
剤の１cm当りの光線の吸光度の測定は、それぞれの光線
の吸光度が０．６以下となるように希釈して測定し、そ
の測定値に希釈率を乗じて求める。なお、酸化分解処理
の安定化のために処理水を貯留する酸化分解処理水槽を
設けることが望ましいが、やむを得ない場合にはこれを
設けることなく、酸化分解処理水を原水へ戻すための取
水弁と循環パイプを設けるだけでもよい。その上、処理
水に更に活性炭吸着などの後処理を施すことにより、処
理水質を一層向上させることも可能である。As the type of the oxidative decomposition tank, any type of tank having a water layer thickness can be used regardless of so-called tank type and once-through type. In addition, the water layer thickness in this specification means the thickness of the water layer of the water to be treated or the like through which light rays such as ultraviolet rays actually pass. Furthermore, the absorbance of light rays per 1 cm of raw water, treated water, and oxidizer was measured by diluting so that the absorbance of each light ray would be 0.6 or less, and multiplying the measured value by the dilution rate. Ask. In addition, it is desirable to provide an oxidative decomposition water tank for storing the treated water to stabilize the oxidative decomposition treatment, but if it is unavoidable, do not install this and take the intake valve for returning the oxidative decomposition treated water to the raw water. A circulation pipe may be provided. In addition, it is possible to further improve the quality of treated water by subjecting the treated water to post-treatment such as adsorption of activated carbon.
【００１０】本発明の実施態様としては、以下のものが
ある。
（１）酸化剤の濃度が原水のＣＯＤの１〜５倍当量であ
ること。
（２）照射光源が低圧水銀ランプであること。
（３）酸化剤が過酸化水素であること。
（４）酸化分解槽の下流側に酸化分解処理水槽を設けた
こと。
（５）循環水の原水への返戻位置が酸化剤の添加位置の
上流側にあること。The embodiments of the present invention are as follows. (1) The concentration of the oxidant is 1 to 5 times equivalent to the COD of the raw water. (2) The irradiation light source is a low pressure mercury lamp. (3) The oxidizing agent is hydrogen peroxide. (4) An oxidative decomposition treatment water tank was provided on the downstream side of the oxidative decomposition tank. (5) The position where the circulating water is returned to the raw water is upstream of the position where the oxidizing agent is added.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面に基づいて説明
するが、本発明はこれらの実施例に限定されるものでは
ない。図１は、本発明に係る難分解性有機物含有排水の
処理方法を示すフローシートであり、原水１は、酸化分
解処理水槽３からの循環水４で希釈されてから、過酸化
水素などの酸化剤５を添加された後、酸化分解槽２へ導
入されて紫外線ランプ等の光源６からの光線に照射され
て酸化剤と紫外線による酸化分解を受けてから酸化分解
処理水槽３を経て処理水７として系外へ排出される。な
お、処理水７の一部は上記の如く、紫外線照射効果を高
めるために、循環水４として酸化分解槽２へ導入する前
の原水１中へ返戻循環される。なお、原水１への循環位
置は、酸化剤５の添加時点の前後いずれの位置であって
もよいが、酸化剤５の添加前の方が酸化分解槽２へ導入
されるまでの時間が長くなり、送液配管中での酸化剤５
の一層の均一分散が行なわれる点でも好ましく、本実施
例でもこの方式を使用した。Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. FIG. 1 is a flow sheet showing a method for treating hardly decomposable organic matter-containing wastewater according to the present invention. Raw water 1 is diluted with circulating water 4 from an oxidative decomposition treatment water tank 3 and then oxidized such as hydrogen peroxide. After the agent 5 is added, the agent 5 is introduced into the oxidative decomposition tank 2 and is irradiated with a light beam from a light source 6 such as an ultraviolet lamp to undergo oxidative decomposition by an oxidant and ultraviolet rays. Is discharged out of the system. As described above, part of the treated water 7 is returned and circulated into the raw water 1 before being introduced as the circulating water 4 into the oxidative decomposition tank 2 in order to enhance the ultraviolet irradiation effect. The circulation position to the raw water 1 may be before or after the addition of the oxidizer 5, but before the addition of the oxidizer 5, it takes a longer time to be introduced into the oxidative decomposition tank 2. And oxidizer 5 in the liquid supply pipe
This method is also used in the present embodiment, since it is preferable in that more uniform dispersion is performed.
【００１２】実施例１
ＣＯＤが６０mg／リットルであるゴミ埋立地浸出水の生
物処理水を、下記に示す２種類の条件にて図１に示すフ
ローシートに従って処理した。
実験条件１
・光源：低圧水銀ランプ（入力電力２０［Ｗ］，主波
長：２５４〔ｎｍ〕）
・原水流量：２．６〜４［リットル／hr］
・過酸化水素添加量：１８０［mg／リットル］
・処理水循環率：０〜０．５［−］
・酸化分解槽水層厚：１［cm］
実験条件２
・光源：低圧水銀ランプ（入力電力２０［Ｗ］，主波
長：２５４〔ｎｍ〕）
・原水流量：４〜８［リットル／hr］
・過酸化水素添加量：９０［mg／リットル］
・処理水循環率：０〜０．５［−］
・酸化分解槽水層厚：２［cm］
・原水は予め２倍希釈して使用（このため実験条件２に
おける原水のＣＯＤは３０mg／リットルである）Example 1 Biologically treated water of landfill leachate having a COD of 60 mg / liter was treated under the following two conditions according to the flow sheet shown in FIG. Experimental condition 1-Light source: low-pressure mercury lamp (input power 20 [W], main wavelength: 254 [nm])-Flow of raw water: 2.6 to 4 [liter / hr] -Amount of hydrogen peroxide added: 180 [mg / Liter] -Treatment water circulation rate: 0-0.5 [-]-Oxidation and decomposition tank water layer thickness: 1 [cm] Experimental condition 2-Light source: low-pressure mercury lamp (input power 20 [W], main wavelength: 254 [nm] ])-Raw water flow rate: 4-8 [liter / hr] -Hydrogen peroxide addition amount: 90 [mg / liter] -Treatment water circulation rate: 0-0.5 [-]-Oxidation decomposition tank water layer thickness: 2 [ cm] ・ Use the raw water after diluting it twice (for this reason, the COD of the raw water in experimental condition 2 is 30 mg / liter)
【００１３】上記実験条件で処理水７のＣＯＤが３mg／
リットルとなるように処理した場合の、処理水循環率Ｒ
或いはそれに対応する酸化分解槽導入時の紫外線吸光度
と紫外線照射時間あたり消費された酸化剤量との関係を
図２、図３に、また処理水循環率Ｒ或いはそれに対応す
る酸化分解槽導入時の紫外線吸光度と紫外線照射時間あ
たり除去されたＣＯＤ量との関係を図４、図５に示す。
なおこのときの原水（ＣＯＤ＝６０mg／リットル）、処
理水（ＣＯＤ＝３mg／リットル）、過酸化水素（１８０
mg／リットル）の紫外線吸光度（２５４ｎｍ）はそれぞ
れ１．６７１、０．０８４、０．１１３であった。又、
実験条件１、実験条件２での〔−１×（Ａ0 ＋Ａ2 −1.
53／Ｌ）／（Ａ1＋Ａ2 −1.53／Ｌ）〕の値は、それぞ
れ０．１９、０．２０であった。Under the above experimental conditions, the treated water 7 has a COD of 3 mg /
Circulation rate R of treated water when treated to give liters
Alternatively, FIG. 2 and FIG. 3 show the relationship between the UV absorbance at the time of introducing the oxidative decomposition tank and the amount of the oxidant consumed per UV irradiation time, and the treated water circulation rate R or the corresponding UV light at the time of introducing the oxidative decomposition tank. The relationship between the absorbance and the amount of COD removed per ultraviolet irradiation time is shown in FIGS. 4 and 5.
At this time, raw water (COD = 60 mg / liter), treated water (COD = 3 mg / liter), hydrogen peroxide (180
The ultraviolet absorbance (254 nm) of mg / liter was 1.671, 0.084, and 0.113, respectively. or,
[−1 × (A 0 + A 2 −1.
The value of 53 / L) / (A 1 + A 2 -1.53 / L) ] were respectively 0.19,0.20.
【００１４】図２、図３より、紫外線照射単位時間あた
り消費された酸化剤量は実験条件に関係なく、本発明に
係る難分解性有機物含有排水の処理方法においては、処
理水循環率Ｒがそれぞれ０．１９、０．２０以上でほぼ
一定であり、それらを下回ると減少することが認められ
た。又図４、図５より紫外線照射単位時間あたり除去さ
れたＣＯＤ量は、実験条件に関係なく、本発明に係る難
分解性有機物含有排水の処理方法においては、処理水循
環率Ｒがそれぞれ０．１９、０．２０のときに最大であ
ることが認められた。2 and 3, the amount of the oxidant consumed per unit time of UV irradiation is independent of the experimental conditions, and in the method for treating wastewater containing persistent organic matter according to the present invention, the treated water circulation rate R is It was confirmed that it was almost constant above 0.19 and 0.20, and decreased below that. Further, from FIG. 4 and FIG. 5, the COD amount removed per unit time of UV irradiation is irrespective of the experimental conditions, and in the method for treating persistent organic matter-containing wastewater according to the present invention, the treated water circulation rate R is 0.19, respectively. , 0.20 was found to be the maximum.
【００１５】以上により、処理水循環率Ｒが〔−１×
（Ａ0 ＋Ａ2 −1.53／Ｌ）／（Ａ1 ＋Ａ2 −1.53／
Ｌ）〕未満の条件では、紫外線照射単位時間あたりの過
酸化水素消費量が減少することによって、紫外線照射に
関わるエネルギー供給量あたりに除去されるＣＯＤ量が
減少することが認められ、処理水循環率Ｒは〔−１×
（Ａ0＋Ａ2 −1.53／Ｌ）／（Ａ1 ＋Ａ2 −1.53／
Ｌ）〕を越えることが望ましいことが認められた。From the above, the treated water circulation rate R is [-1 ×
(A 0 + A 2 −1.53 / L) / (A 1 + A 2 −1.53 /
L)], the hydrogen peroxide consumption per unit time of ultraviolet irradiation is reduced, and thus the amount of COD removed per the amount of energy supply related to ultraviolet irradiation is reduced. R is [-1x
(A 0 + A 2 −1.53 / L) / (A 1 + A 2 −1.53 /
L)] is desirable.
【００１６】[0016]
【発明の効果】本発明によれば、光照射工程へ処理済み
の光透過率の高い処理水を循環しながら光照射を行うの
で、原水の光線透過率を高め、光照射エネルギー当りの
酸化剤励起量が増加し、活性種発生量が増大することか
ら、酸化分解効率が向上し、難分解性有機物含有排水を
低コストで処理することが可能である。特に、酸化分解
槽への処理水循環率Ｒが、〔−１×（Ａ0 ＋Ａ2 −1.53
／Ｌ）／（Ａ1 ＋Ａ2 −1.53／Ｌ）〕≦Ｒ≦２の関係に
あるときは、一層効率的に酸化分解を行うことができ、
光線照射コスト当り処理可能な有機物量が増大し、低コ
ストで高度な処理が可能となる。According to the present invention, since the light irradiation is performed while circulating the treated water having a high light transmittance which has been treated to the light irradiation step, the light transmittance of the raw water is increased and the oxidizer per light irradiation energy is increased. Since the amount of excitation is increased and the amount of active species generated is increased, the efficiency of oxidative decomposition is improved, and it is possible to treat the wastewater containing the hardly decomposable organic matter at low cost. In particular, the treated water circulation rate R to the oxidative decomposition tank is [-1 × (A 0 + A 2 −1.53
/ L) / (A 1 + A 2 −1.53 / L)] ≦ R ≦ 2, oxidative decomposition can be performed more efficiently,
The amount of organic matter that can be treated per light irradiation cost is increased, and high-level treatment is possible at low cost.
【図１】本発明に係る難分解性有機物含有排水の処理方
法を示すフローシート。FIG. 1 is a flow sheet showing a method for treating wastewater containing a persistent organic substance according to the present invention.
【図２】実施例１、実験条件１での処理水循環率Ｒに対
応する酸化分解槽導入時の紫外線吸光度と紫外線照射時
間当りの過酸化水素消費量の関係を示すグラフ。FIG. 2 is a graph showing the relationship between the ultraviolet absorbance at the time of introducing an oxidative decomposition tank and the hydrogen peroxide consumption per ultraviolet irradiation time, which corresponds to the treated water circulation rate R under Example 1 and experimental conditions 1.
【図３】実施例１、実験条件２での処理水循環率Ｒに対
応する酸化分解槽導入時の紫外線吸光度と紫外線照射時
間当りの過酸化水素消費量の関係を示すグラフ。FIG. 3 is a graph showing the relationship between the ultraviolet absorbance at the time of introducing an oxidative decomposition tank and the hydrogen peroxide consumption per ultraviolet irradiation time, which corresponds to the treated water circulation rate R under Example 1 and experimental conditions 2.
【図４】実施例１、実験条件１での処理水循環率Ｒに対
応する酸化分解槽導入時の紫外線吸光度と紫外線照射時
間当りのＣＯＤ除去量の関係を示すグラフ。FIG. 4 is a graph showing the relationship between the ultraviolet absorbance at the time of introducing an oxidative decomposition tank and the COD removal amount per ultraviolet irradiation time, which corresponds to the treated water circulation rate R under Example 1 and experimental conditions 1.
【図５】実施例１、実験条件２での処理水循環率Ｒに対
応する酸化分解槽導入時の紫外線吸光度と紫外線照射時
間当りのＣＯＤ除去量の関係を示すグラフ。FIG. 5 is a graph showing the relationship between the ultraviolet absorbance at the time of introducing an oxidative decomposition tank and the COD removal amount per ultraviolet irradiation time, which corresponds to the treated water circulation rate R under Example 1 and experimental conditions 2.
１ 原水 ２ 酸化分解槽 ３ 処理水槽 ４ 循環水 ５ 酸化剤 ６ 紫外線ランプ ７ 処理水 1 raw water 2 Oxidation decomposition tank 3 treated water tank 4 circulating water 5 Oxidizing agent 6 UV lamp 7 treated water
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−212385（ＪＰ，Ａ) 特公 平７−49118（ＪＰ，Ｂ２) 特許2601430（ＪＰ，Ｂ２) 特許2582550（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 1/72 C02F 1/32 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-61-212385 (JP, A) JP-B 7-49118 (JP, B2) JP 2601430 (JP, B2) JP 2582550 (JP, B2) (58) ) Fields surveyed (Int.Cl. 7 , DB name) C02F 1/72 C02F 1/32
Claims (2)
で光線と酸化剤を併用して物理化学的に処理する方法に
おいて、光照射工程へ処理水の一部を循環することによ
り前記難分解性有機物含有排水を希釈せしめた後、それ
に光照射を行うとともに、前記酸化分解槽として水層の
厚さがＬｃｍである酸化分解槽を使用し、原水の１ｃｍ
当りの光線吸光度（Ａ０）、処理済み排水の１ｃｍ当り
の光線吸光度（Ａ１）及び酸化分解槽への流入時点での
酸化剤濃度における酸化剤の１ｃｍ当りの光線吸光度
（Ａ２）を測定し、これらの測定値に基づき、酸化分解
槽への処理水循環率Ｒを下式に示す関係に維持すること
を特徴とする難分解性有機物含有排水の処理方法。〔−１×（Ａ０＋Ａ２−１．５３／Ｌ）／（Ａ１＋Ａ２
−１．５３／Ｌ）〕≦Ｒ≦２ 1. A method of physicochemically treating a wastewater containing a hardly decomposable organic substance by using a light ray and an oxidant together in an oxidative decomposition tank, wherein a part of the treated water is circulated to a light irradiation step to prevent the above-mentioned difficulty. After diluting the decomposable organic matter-containing wastewater, it is irradiated with light and used as an oxidative decomposition tank for the water layer.
Using an oxidative decomposition tank with a thickness of Lcm, 1 cm of raw water
Absorbance of light (A0) per 1 cm of treated wastewater
Absorbance of light (A1) at the time of inflow into the oxidative decomposition tank
Light Absorbance per cm of Oxidizing Agent at Oxidizing Agent Concentration
(A2) was measured, and based on these measured values, oxidative decomposition
A method for treating wastewater containing a hardly decomposable organic matter, characterized in that the circulation rate R of treated water to the tank is maintained in the relationship shown in the following formula . [-1 × (A0 + A2-1.53 / L) / (A1 + A2
−1.53 / L)] ≦ R ≦ 2
外線であることを特徴とする請求項１記載の難分解性有
機物含有排水の処理方法。 2. The light ray is a purple ray having a wavelength of 180 to 260 nm.
How to process the low-degradable organic substances containing wastewater according to claim 1, characterized in that the outside line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21268296A JP3483092B2 (en) | 1996-08-12 | 1996-08-12 | Treatment method for wastewater containing persistent organic matter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21268296A JP3483092B2 (en) | 1996-08-12 | 1996-08-12 | Treatment method for wastewater containing persistent organic matter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1052693A JPH1052693A (en) | 1998-02-24 |
| JP3483092B2 true JP3483092B2 (en) | 2004-01-06 |
Family
ID=16626676
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21268296A Expired - Fee Related JP3483092B2 (en) | 1996-08-12 | 1996-08-12 | Treatment method for wastewater containing persistent organic matter |
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| JP5326723B2 (en) * | 2009-03-25 | 2013-10-30 | 三浦工業株式会社 | Water treatment equipment |
| CN119612821A (en) * | 2024-12-06 | 2025-03-14 | 中国石油化工股份有限公司 | Sewage recycling method and device based on ultraviolet and reverse osmosis synergistic effect |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2582550B2 (en) | 1986-05-09 | 1997-02-19 | 岩崎電気株式会社 | Treatment of water containing organic matter |
| JP2601430B2 (en) | 1988-03-18 | 1997-04-16 | ウシオ電機株式会社 | Method and apparatus for processing fluid by ultraviolet irradiation |
-
1996
- 1996-08-12 JP JP21268296A patent/JP3483092B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2582550B2 (en) | 1986-05-09 | 1997-02-19 | 岩崎電気株式会社 | Treatment of water containing organic matter |
| JP2601430B2 (en) | 1988-03-18 | 1997-04-16 | ウシオ電機株式会社 | Method and apparatus for processing fluid by ultraviolet irradiation |
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| Publication number | Publication date |
|---|---|
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