JP6036011B2 - Method and apparatus for treating wastewater containing formaldehyde - Google Patents
Method and apparatus for treating wastewater containing formaldehyde Download PDFInfo
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Description
本発明は、ホルムアルデヒド含有排水の処理方法及び装置に係り、特にホルムアルデヒド含有排水に亜硫酸塩を添加して逆浸透膜処理した後、膜処理水を促進酸化処理して、ホルムアルデヒドを除去する方法及び装置に関する。 The present invention relates to a method and apparatus for treating formaldehyde-containing wastewater, and in particular, a method and apparatus for removing formaldehyde by promoting oxidation treatment of membrane treated water after adding reverse osmosis membrane treatment by adding sulfite to formaldehyde-containing wastewater. About.
食品工場や飲料工場の容器洗浄工程、高圧殺菌（レトルト）工程、ホルムアルデヒドを原料とするフェノール樹脂等の樹脂や薬剤の製造工程等から、ホルムアルデヒド含有排水が排出されることがある。 Formaldehyde-containing wastewater may be discharged from a container washing process, a high-pressure sterilization (retort) process in a food factory or a beverage factory, a manufacturing process of a resin such as a phenol resin using formaldehyde as a raw material, or a drug.
ホルムアルデヒド含有排水の処理方法として、特許文献１には、ホルムアルデヒド含有排水に過酸化水素を添加した後、活性炭と接触させ、生じたヒドロキシラジカルによってホルムアルデヒドを分解除去する方法が記載されている。特許文献２，３には、ホルムアルデヒド含有排水にアンモニアを添加してヘキサメチレンテトラミンを生成させた後、逆浸透膜分離処理してヘキサメチレンテトラミンを濃縮分離する方法が記載されている。
As a method for treating formaldehyde-containing wastewater, Patent Document 1 describes a method in which hydrogen peroxide is added to formaldehyde-containing wastewater, and then contacted with activated carbon, and formaldehyde is decomposed and removed by the generated hydroxyl radicals.
なお、熱水式のレトルト処理では、レトルト釜に水道水（１０〜２５℃）を供給して加圧下に１２０℃程度まで昇温して飲料缶などを高圧高温殺菌（レトルト処理）し、その後、徐々に冷却して５０〜８０℃程度（６０〜７０℃程度）まで温度が下がった後、レトルト釜から排水して、総合排水処理を行うなどした後に放流する。 In the hot water type retort treatment, tap water (10 to 25 ° C.) is supplied to the retort kettle, and the temperature is raised to about 120 ° C. under pressure to sterilize beverage cans and the like at high pressure and high temperature (retort treatment). After gradually cooling to a temperature of about 50 to 80 ° C. (about 60 to 70 ° C.), the water is drained from the retort kettle and discharged after being subjected to a comprehensive drainage treatment.
このレトルト排水は、高温であるため、水道水（通常は１０〜２５℃）を昇温するよりもレトルト排水（５０〜８０℃）を昇温する方がエネルギー効率が良いので、レトルト排水を回収し、再利用することが望まれている。 Since this retort drainage is hot, it is more energy efficient to raise the retort drainage (50 to 80 ° C) than to raise the tap water (usually 10 to 25 ° C). However, it is desired to be reused.
しかし、レトルト排水の回収再利用には以下の技術的課題がある。
（１）回収水を容器洗浄排水やレトルト排水に再利用するときは安全のため水道法の水質基準を満たす水質とする。レトルト排水を単に循環利用すると高温で水分蒸発量が多いことから微量不純物が徐々に濃縮されていく。また、ホルムアルデヒド（ＨＣＨＯ）は水への溶解性が高いため、空気中のＨＣＨＯがレトルト排水に取り込まれやすいと推測され、そのまま無処理で循環運転し続けると０．５〜３ｐｐｍ程度まで濃縮される恐れもあると考えられる。近年、水道法の水質基準が改定され、ホルムアルデヒドも監視項目に加えられて水道水の水質基準８０ｐｐｂ（８０μｇ／Ｌ）となったため、レトルト排水を回収したときは予めホルムアルデヒドを除去してから再利用することが望ましい。
（２）もともとレトルトには水道水を使用しているので水道水由来の緩衝性物質（炭酸ソーダなど）が含まれておりｐＨ調整が困難か又はｐＨ調整剤の必要量が多くなる恐れがある。
However, recovery and reuse of retort wastewater has the following technical problems.
(1) When the recovered water is reused for container washing drainage or retort drainage, it shall be water quality that meets the water quality standards of the Waterworks Act for safety. If the retort wastewater is simply recycled, trace impurities are gradually concentrated because the amount of water evaporation is high at high temperatures. In addition, since formaldehyde (HCHO) is highly soluble in water, it is presumed that HCHO in the air is likely to be taken into retort wastewater, and if it is continuously circulated without treatment, it is concentrated to about 0.5 to 3 ppm. There seems to be fear. In recent years, the water quality standard of the Water Supply Law has been revised, and formaldehyde has been added to the monitoring items to the water quality standard of 80 ppb (80 μg / L). It is desirable to do.
(2) Since tap water is originally used in retort, buffer substances (sodium carbonate, etc.) derived from tap water are included, and pH adjustment is difficult or the required amount of pH adjuster may increase. .
以上のことから、レトルト排水を回収して、なるべくｐＨ調整を行わずに、ＨＣＨＯを確実に水道水水質基準以下まで除去して、レトルト処理や工業用水への再利用を可能にすることが望まれている。 Based on the above, it is hoped that the retort wastewater will be collected and HCHO will be reliably removed to below the tap water quality standard without any pH adjustment so that it can be reused for retort treatment and industrial water. It is rare.
なお、ＨＣＨＯ除去として促進酸化が考えられるが、原水中のＨＣＨＯのすべてを促進酸化によって除去する場合、装置コストが高く実用的ではない。 Although accelerated oxidation can be considered as HCHO removal, when all of HCHO in raw water is removed by accelerated oxidation, the apparatus cost is high and impractical.
特許文献１では、ホルムアルデヒドが十分に除去されない。例えば、特許文献１の実施例１，２では、ホルムアルデヒド濃度２ｐｐｍのホルムアルデヒド含有排水に過酸化水素を１００ｐｐｍ注入し、活性炭充填カラムにＳＶ＝２０ｈ−１又は１０ｈ−１にて通水しているが、ホルムアルデヒドの分解能は２０％または４５％に止まる。
In Patent Document 1, formaldehyde is not sufficiently removed. For example, in Examples 1 and 2 of
特許文献２，３は、刺激臭を有し、劇物でもあるアンモニアを用いる事が必要である。
In
本発明は、アンモニアを用いることなく、ホルムアルデヒドを高除去率にて除去することができるホルムアルデヒド含有排水の処理方法および装置を提供することを目的とする。 An object of this invention is to provide the processing method and apparatus of formaldehyde containing waste water which can remove formaldehyde with a high removal rate, without using ammonia.
本発明のホルムアルデヒド含有排水の処理方法は、ホルムアルデヒド含有排水に亜硫酸塩を添加して逆浸透膜処理する工程と、該逆浸透膜処理水に酸化剤を添加してホルムアルデヒドを酸化分解処理する促進酸化工程とを有するホルムアルデヒド含有排水の処理方法であって、該ホルムアルデヒド含有排水のホルムアルデヒド濃度が０．０８〜１０ｍｇ／Ｌであり、該逆浸透膜処理水のホルムアルデヒド濃度が１.５ｍｇ／Ｌ以下であることを特徴とするものである。 The method for treating formaldehyde-containing wastewater according to the present invention comprises a step of adding sulfite to formaldehyde-containing wastewater and treating it with a reverse osmosis membrane; A formaldehyde concentration of the wastewater containing formaldehyde is 0.08 to 10 mg / L, and the formaldehyde concentration of the reverse osmosis membrane treated water is 1.5 mg / L or less It is characterized by this.
本発明のホルムアルデヒド含有排水の処理装置は、ホルムアルデヒド含有排水に亜硫酸塩を添加する手段と、亜硫酸塩が添加された排水を逆浸透膜処理する逆浸透膜装置と、該逆浸透膜装置からの処理水に酸化剤を添加してホルムアルデヒドを酸化分解処理する促進酸化手段とを有するホルムアルデヒド含有排水の処理装置であって、該ホルムアルデヒド含有排水のホルムアルデヒド濃度が０．０８〜１０ｍｇ／Ｌであり、該逆浸透膜装置からの処理水のホルムアルデヒド濃度が１．５ｍｇ／Ｌ以下であることを特徴とするものである。 The treatment apparatus for formaldehyde-containing wastewater of the present invention includes a means for adding sulfite to formaldehyde-containing wastewater, a reverse osmosis membrane apparatus for treating the wastewater to which sulfite is added, and a treatment from the reverse osmosis membrane apparatus. An apparatus for treating formaldehyde-containing wastewater having accelerated oxidation means for oxidizing and decomposing formaldehyde by adding an oxidizing agent to water , wherein the formaldehyde concentration of the wastewater containing formaldehyde is 0.08 to 10 mg / L, and vice versa The formaldehyde concentration of the treated water from the osmosis membrane device is 1.5 mg / L or less .
本発明の一態様では、促進酸化を行う工程又は手段において、逆浸透膜処理水に前記酸化剤として過酸化水素とオゾンを添加する。 In one aspect of the present invention, hydrogen peroxide and ozone are added to the reverse osmosis membrane treated water as the oxidant in the process or means for performing accelerated oxidation.
本発明の別の一態様では、促進酸化を行う工程又は手段において、逆浸透膜処理水に前記酸化剤として過酸化水素を添加し、紫外線照射する。 In another aspect of the present invention, hydrogen peroxide is added to the reverse osmosis membrane treated water as the oxidant and irradiated with ultraviolet rays in the process or means for carrying out accelerated oxidation.
本発明では、亜硫酸イオンとホルムアルデヒドとの重量濃度比（［ＳＯ３］／［ＨＣＨＯ］）が１〜１０特に３〜８となるようにホルムアルデヒド含有排水に亜硫酸塩を添加することが好ましい。 In the present invention, it is preferable to add sulfite to the wastewater containing formaldehyde so that the weight concentration ratio of sulfite ions to formaldehyde ([SO 3 ] / [HCHO]) is 1 to 10, particularly 3 to 8.
ホルムアルデヒド含有排水に亜硫酸塩を添加すると、ヒドロキシメタンスルホン酸塩が生成する。このヒドロキシメタンスルホン酸塩は、ホルムアルデヒドに比べて分子量が４倍以上大きく、また、イオン半径も大きい為、逆浸透膜によって分離され易くなる。この逆浸透膜処理により、ホルムアルデヒドの大半が除去される他、被処理液中の溶存有機物や、促進酸化法を阻害するイオン成分（例えば、ＨＣＯ３ −やＣｌ−など）も除去される為、促進酸化法によるホルムアルデヒドの分解除去が円滑に行われる。本発明では亜硫酸塩を使用するが、この亜硫酸塩はアンモニアに比べ取り扱いが極めて容易である。 When sulfite is added to formaldehyde-containing wastewater, hydroxymethanesulfonate is formed. This hydroxymethane sulfonate has a molecular weight that is four times or more larger than that of formaldehyde and has a large ionic radius, so that it is easily separated by a reverse osmosis membrane. This reverse osmosis membrane treatment removes most of the formaldehyde and also removes dissolved organic substances in the liquid to be treated and ionic components that inhibit the accelerated oxidation method (for example, HCO 3 − and Cl − ). Formaldehyde can be decomposed and removed smoothly by the accelerated oxidation method. In the present invention, sulfite is used, but this sulfite is very easy to handle compared to ammonia.
以下、本発明についてさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail.
本発明で処理対象とするホルムアルデヒド含有排水としては、食品工場や飲料工場の容器洗浄工程や高圧殺菌（レトルト）工程からの排水のほか、ホルムアルデヒド製造工程排水、ホルムアルデヒドを原料とするフェノール樹脂、尿素樹脂、メラミン樹脂、ポリアセタール樹脂、ビニロン、ヘキサメチレンテトラミン、ペンタエリトリシド、パラホルムアルデヒド、界面活性剤、農薬、消毒剤、防腐剤等の製造工程からの排水が例示されるが、これらに限定されない。 Formaldehyde-containing wastewater to be treated in the present invention includes wastewater from the container washing process and high-pressure sterilization (retort) process of food factories and beverage factories, formaldehyde production process wastewater, phenolic resin made from formaldehyde, urea resin Examples include, but are not limited to, effluent from manufacturing processes such as melamine resin, polyacetal resin, vinylon, hexamethylenetetramine, pentaerythriside, paraformaldehyde, surfactant, agricultural chemical, disinfectant, and preservative.
処理対象とするホルムアルデヒド含有排水中のホルムアルデヒド濃度は、通常、０．０８〜１０ｍｇ／Ｌ特に０．０８〜５ｍｇ／Ｌ程度であるが、これに限定されない。 The formaldehyde concentration in the formaldehyde-containing wastewater to be treated is usually about 0.08 to 10 mg / L, particularly about 0.08 to 5 mg / L, but is not limited thereto.
ホルムアルデヒド含有排水のｐＨは、特に限定されるものではないが、４〜８．６特に５〜８程度が望ましい。 The pH of the formaldehyde-containing wastewater is not particularly limited, but is preferably about 4 to 8.6, particularly about 5 to 8.
ホルムアルデヒド含有排水に添加する亜硫酸塩は、Ｎａ２ＳＯ３及び／又はＮａＨＳＯ３などが好適である。 The sulfite added to the formaldehyde-containing wastewater is preferably Na 2 SO 3 and / or NaHSO 3 .
亜硫酸塩の添加量は、ホルムアルデヒド含有排水中のホルムアルデヒド濃度以上であることが好ましく、特に亜硫酸イオンとホルムアルデヒドとの重量濃度比（［ＳＯ３］／［ＨＣＨＯ］）が１〜１０特に３〜８とりわけ５〜７となる程度が望ましい。この比が１よりも小さいとヒドロキシメタンスルホン酸塩の生成が少なく、ホルムアルデヒドの除去効率が低くなるおそれがある。また、この比が１０よりも大きいと、亜硫酸塩が過剰となり、コスト高となる。 The amount of sulfite added is preferably equal to or higher than the formaldehyde concentration in the wastewater containing formaldehyde, and the weight concentration ratio ([SO 3 ] / [HCHO]) between sulfite ions and formaldehyde is 1 to 10, especially 3 to 8, in particular. A degree of 5 to 7 is desirable. When this ratio is less than 1, the production of hydroxymethanesulfonate is small, and the removal efficiency of formaldehyde may be lowered. On the other hand, if this ratio is larger than 10, the sulfite becomes excessive and the cost increases.
ホルムアルデヒド含有排水に亜硫酸塩を添加した後、直ちに逆浸透膜（以下、ＲＯということがある。）処理してもよく、所定時間経過後、ＲＯ処理してもよい。ＲＯ装置のＲＯ膜としては、食塩排除率９９％以上のものが好ましい。また、被処理水の温度が５０〜８０℃の程度の高温になることがあるため、ＲＯ膜としては５０〜８０℃以上の耐熱性を有するものが好ましい。 After adding sulfite to formaldehyde-containing wastewater, it may be immediately treated with a reverse osmosis membrane (hereinafter sometimes referred to as RO), or after a predetermined time has elapsed, RO treatment may be performed. The RO membrane of the RO device is preferably a salt rejection rate of 99% or more. Moreover, since the temperature of to-be-processed water may become a high temperature about 50-80 degreeC, what has heat resistance of 50-80 degreeC or more is preferable as RO membrane.
ＲＯ処理水中のホルムアルデヒド濃度は１．５ｍｇ／Ｌ以下、特に０．８ｍｇ／Ｌ以下が望ましい。また、ＲＯ処理水中の亜硫酸塩濃度は１ｍｇ／Ｌ以下特に０．５ｍｇ／Ｌ以下が望ましい。 The formaldehyde concentration in the RO-treated water is preferably 1.5 mg / L or less, particularly preferably 0.8 mg / L or less. In addition, the concentration of sulfite in the RO-treated water is preferably 1 mg / L or less, particularly 0.5 mg / L or less.
本発明では、このＲＯ処理水をオゾン、過酸化水素などの酸化剤を添加して促進酸化処理する。促進酸化処理としては、ＲＯ処理水にまず過酸化水素を添加し、次いで紫外線照射するか又はオゾンを添加するのが好ましい。なお、この促進酸化処理により、ＲＯ処理水中の残留亜硫酸イオンが硫酸イオンに酸化される。 In the present invention, this RO-treated water is subjected to accelerated oxidation treatment by adding an oxidizing agent such as ozone or hydrogen peroxide. As the accelerated oxidation treatment, it is preferable to first add hydrogen peroxide to the RO-treated water, and then irradiate with ultraviolet rays or add ozone. By this accelerated oxidation treatment, residual sulfite ions in the RO treated water are oxidized to sulfate ions.
促進酸化法が、過酸化水素添加及び紫外線照射である場合、過酸化水素の添加量（重量）は、ＲＯ処理水中のホルムアルデヒド濃度（重量）の１倍〜１５倍程度、特に２倍〜８倍程度が望ましい。紫外線照射量は、ホルムアルデヒド１ｍｇ／Ｌ当たり、また、排水量１ｍ３当たり０．５ｋＷｈ以上、望ましくは１〜３ｋＷｈであればよい。ｐＨは特に限定されるものではないが、４以上８．６以下（特に５以上８以下）が望ましい。 When the accelerated oxidation method is hydrogen peroxide addition and ultraviolet irradiation, the hydrogen peroxide addition amount (weight) is about 1 to 15 times, especially 2 to 8 times the formaldehyde concentration (weight) in the RO-treated water. Degree is desirable. The amount of ultraviolet irradiation may be 0.5 kWh or more, preferably 1 to 3 kWh per 1 mg / L of formaldehyde and 1 m 3 of drainage. Although pH is not specifically limited, 4 or more and 8.6 or less (especially 5 or more and 8 or less) are desirable.
促進酸化法が、過酸化水素及びオゾン添加である場合、過酸化水素の添加量（重量）は、ＲＯ処理水中のホルムアルデヒド濃度（重量）の１倍〜１５倍程度、特に２倍〜８倍程度が望ましい。オゾンの吹き込み量（重量）は、ＲＯ処理水中のホルムアルデヒド濃度（重量）の１倍〜５０倍程度、特に２倍〜３０倍程度が望ましい。ｐＨは特に限定されるものではないが、４以上８．６以下（特に５以上８以下）が望ましい。 When the accelerated oxidation method is hydrogen peroxide and ozone addition, the addition amount (weight) of hydrogen peroxide is about 1 to 15 times, especially about 2 to 8 times the formaldehyde concentration (weight) in the RO-treated water. Is desirable. The ozone blowing amount (weight) is desirably about 1 to 50 times, particularly about 2 to 30 times the formaldehyde concentration (weight) in the RO-treated water. Although pH is not specifically limited, 4 or more and 8.6 or less (especially 5 or more and 8 or less) are desirable.
本発明では、ＲＯ処理水を、まず、過酸化水素及びオゾンで処理した後、紫外線照射処理してもよい。ＲＯ処理水を過酸化水素及びオゾンで処理し、次に過酸化水素及び紫外線照射により処理してもよい。また、ＲＯ処理水を、過酸化水素添加、オゾン添加及び紫外線照射を同時に行って処理しても良い。 In the present invention, the RO-treated water may be first treated with hydrogen peroxide and ozone and then irradiated with ultraviolet rays. The RO-treated water may be treated with hydrogen peroxide and ozone, and then treated with hydrogen peroxide and ultraviolet irradiation. Further, the RO-treated water may be treated by adding hydrogen peroxide, ozone, and ultraviolet irradiation at the same time.
図１，２はそれぞれ本発明のホルムアルデヒド含有排水処理装置の一例を示すフロー図である。 1 and 2 are flowcharts showing examples of the formaldehyde-containing wastewater treatment apparatus of the present invention.
図１，２のいずれにおいても、被処理原水（ホルムアルデヒド含有排水）は、ポンプ１を経て混合器２へ送られ、亜硫酸塩溶液と混合される。亜硫酸塩溶液は、タンク３からポンプ４を経て混合器２へ供給される。混合器２で亜硫酸塩溶液が添加及び混合された被処理水は、ＲＯ装置５でＲＯ処理され、透過水が貯槽６へ導入される。貯槽６内のＲＯ処理水は、ポンプ７により混合器８へ送られ、酸化剤（過酸化水素）と混合される。過酸化水素はタンク９からポンプ１０を介して混合器８へ供給される。
1 and 2, raw water to be treated (formaldehyde-containing wastewater) is sent to the
図１では、酸化剤が添加及び混合されたＲＯ処理水が紫外線照射装置１１に通水され、紫外線照射され、促進酸化された後、活性炭塔１２に通水され、残留過酸化水素の分解、残留有機物の吸着が行われた後、処理水として取り出される。
In FIG. 1, RO treated water to which an oxidizing agent has been added and mixed is passed through an
図２では、紫外線照射装置１１の代わりにオゾン処理塔１１’が設けられ、混合器８からの過酸化水素添加ＲＯ処理水にオゾンが添加されて促進酸化処理された後、活性炭塔１２に通水される。活性炭塔１２では、残留過酸化水素及びオゾンの分解、残留有機物の吸着が行われる。その他は図１と同じである。
In FIG. 2, an
なお、図１，２のいずれにおいても、ＲＯ装置５の濃縮水は原水に戻すか、又は好気性生物処理又は嫌気性生物処理によって処理するのが好ましい。
In any of FIGS. 1 and 2, it is preferable that the concentrated water of the
［比較例１（亜硫酸塩添加後、ＲＯ処理）］
ホルムアルデヒド濃度３ｍｇ／ＬでｐＨ５．４のホルムアルデヒド含有排水を調製した。この排水に［ＳＯ３］／［ＨＣＨＯ］比（重量比）が０，３，５，又は１０となるようにＮａＨＳＯ３を添加した（「０」は無添加）。室温で十数秒撹拌した後、逆浸透膜装置（日東電工(株)製ＥＳ−２０）に１回のみ通水して、処理水を得た。この処理水中のホルムアルデヒド濃度を測定して、ホルムアルデヒドの除去率を求めた。結果を図３に示す。
[Comparative Example 1 (after sulfite addition, RO treatment)]
A formaldehyde-containing wastewater having a formaldehyde concentration of 3 mg / L and a pH of 5.4 was prepared. NaHSO 3 was added to this waste water so that the [SO 3 ] / [HCHO] ratio (weight ratio) was 0, 3 , 5, or 10 (“0” was not added). After stirring at room temperature for tens of seconds, water was passed only once through a reverse osmosis membrane apparatus (ES-20 manufactured by Nitto Denko Corporation) to obtain treated water. The formaldehyde concentration in this treated water was measured to determine the removal rate of formaldehyde. The results are shown in FIG.
図３の通り、排水に添加するＮａＨＳＯ３量を増やし、［ＳＯ３］／［ＨＣＨＯ］比を５程度まで高めると、ホルムアルデヒド除去率も急激に高くなるが、［ＳＯ３］／［ＨＣＨＯ］比が5を越えると、ホルムアルデヒド除去率の伸びは鈍化し、［ＳＯ３］／［ＨＣＨＯ］比１０で９０％と、ほぼ一定になる。この時の処理水のホルムアルデヒド濃度は、０．３ｍｇ／Ｌであり、水道水基準は満足しない。 As shown in FIG. 3, when the amount of NaHSO 3 added to the waste water is increased and the [SO 3 ] / [HCHO] ratio is increased to about 5, the formaldehyde removal rate increases rapidly, but the [SO 3 ] / [HCHO] ratio increases. When the ratio exceeds 5, the growth of the formaldehyde removal rate slows down and becomes almost constant at 90% at a [SO 3 ] / [HCHO] ratio of 10. The formaldehyde concentration of the treated water at this time is 0.3 mg / L and does not satisfy the tap water standard.
［実施例１（亜硫酸塩添加後、ＲＯ→過酸化水素＋オゾン）］
上記の比較例１の［ＳＯ３］／［ＨＣＨＯ］比＝６のＲＯ処理水に過酸化水素を濃度２．０ｍｇ／Ｌになるように添加し、次にオゾンを３ｍｇ／Ｌ吹き込んだ。この処理水のホルムアルデヒド濃度を測定した結果、０．０１１ｍｇ／Ｌ未満であり、水道水基準を満足するものであった。
[Example 1 (after adding sulfite, RO → hydrogen peroxide + ozone)]
Hydrogen peroxide was added to the RO-treated water having the [SO 3 ] / [HCHO] ratio = 6 in Comparative Example 1 so as to have a concentration of 2.0 mg / L, and then ozone was blown at 3 mg / L. As a result of measuring the formaldehyde concentration of this treated water, it was less than 0.011 mg / L and satisfied the tap water standard.
［実施例２（亜硫酸塩添加後、ＲＯ→過酸化水素＋紫外線照射）］
上記の比較例１の［ＳＯ３］／［ＨＣＨＯ］比＝５のＲＯ処理水に過酸化水素を濃度２．０ｍｇ／Ｌになるように添加し、次に紫外線を１．２ｋＷｈ／ｍ３照射した。この処理水のホルムアルデヒド濃度を測定した結果、０．０５３ｍｇ／Ｌであり、水道水基準を満足するものであった。
[Example 2 (after adding sulfite, RO → hydrogen peroxide + ultraviolet irradiation)]
Hydrogen peroxide is added to the RO-treated water having the [SO 3 ] / [HCHO] ratio = 5 in Comparative Example 1 so as to have a concentration of 2.0 mg / L, and then irradiated with ultraviolet rays of 1.2 kWh / m 3. did. As a result of measuring the formaldehyde concentration of this treated water, it was 0.053 mg / L and satisfied the tap water standard.
５ ＲＯ装置
１１ 紫外線照射装置
１１’ オゾン処理塔
１２ 活性炭塔
5
Claims (10)
該逆浸透膜処理水に酸化剤を添加してホルムアルデヒドを酸化分解処理する促進酸化工程と
を有するホルムアルデヒド含有排水の処理方法であって、
該ホルムアルデヒド含有排水のホルムアルデヒド濃度が０．０８〜１０ｍｇ／Ｌであり、該逆浸透膜処理水のホルムアルデヒド濃度が１.５ｍｇ／Ｌ以下であることを特徴とするホルムアルデヒド含有排水の処理方法。 A process of reverse osmosis membrane treatment by adding sulfite to formaldehyde-containing wastewater;
A process for treating formaldehyde-containing wastewater having an accelerated oxidation step of oxidizing and decomposing formaldehyde by adding an oxidizing agent to the reverse osmosis membrane treated water ,
A method for treating formaldehyde-containing wastewater, wherein the formaldehyde concentration of the formaldehyde-containing wastewater is 0.08 to 10 mg / L, and the formaldehyde concentration of the reverse osmosis membrane treated water is 1.5 mg / L or less .
亜硫酸塩が添加された排水を逆浸透膜処理する逆浸透膜装置と、
該逆浸透膜装置からの処理水に酸化剤を添加してホルムアルデヒドを酸化分解処理する促進酸化手段と
を有するホルムアルデヒド含有排水の処理装置であって、
該ホルムアルデヒド含有排水のホルムアルデヒド濃度が０．０８〜１０ｍｇ／Ｌであり、該逆浸透膜装置からの処理水のホルムアルデヒド濃度が１．５ｍｇ／Ｌ以下であることを特徴とするホルムアルデヒド含有排水の処理装置。 Means for adding sulfite to formaldehyde-containing wastewater;
A reverse osmosis membrane device for treating a wastewater to which sulfite is added with a reverse osmosis membrane;
An apparatus for treating formaldehyde-containing wastewater having an oxidative oxidation means for oxidizing and decomposing formaldehyde by adding an oxidant to treated water from the reverse osmosis membrane apparatus ,
The formaldehyde concentration of the wastewater containing formaldehyde is 0.08 to 10 mg / L, and the formaldehyde concentration of treated water from the reverse osmosis membrane device is 1.5 mg / L or less, .
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