JPH0137985B2 - - Google Patents
Info
- Publication number
- JPH0137985B2 JPH0137985B2 JP5052584A JP5052584A JPH0137985B2 JP H0137985 B2 JPH0137985 B2 JP H0137985B2 JP 5052584 A JP5052584 A JP 5052584A JP 5052584 A JP5052584 A JP 5052584A JP H0137985 B2 JPH0137985 B2 JP H0137985B2
- Authority
- JP
- Japan
- Prior art keywords
- edta
- wastewater
- copper
- plating
- cod
- 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
Links
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 60
- 239000002351 wastewater Substances 0.000 claims description 41
- 239000002253 acid Substances 0.000 claims description 20
- 238000007747 plating Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 230000003647 oxidation Effects 0.000 description 12
- 238000007254 oxidation reaction Methods 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 238000011084 recovery Methods 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 230000035484 reaction time Effects 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 235000010755 mineral Nutrition 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 159000000000 sodium salts Chemical group 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Description
【発明の詳細な説明】
〔発明の属する分野〕
この発明はめつき廃水の浄化処理方法に係り、
特にEDTA、銅を含む老めつき液から有価物で
ある銅、EDTAを回収した後の有価物回収残廃
水および有価物を洗浄した後の洗浄廃水からなる
めつき廃水の浄化方法に関する。[Detailed Description of the Invention] [Field to which the invention pertains] This invention relates to a method for purifying plating wastewater,
In particular, the present invention relates to a method for purifying plating wastewater consisting of wastewater remaining after recovering valuables, such as copper and EDTA, from an aging solution containing EDTA and copper, and washing wastewater after washing the valuables.
化学銅めつき液、たとえばEDTA、ホルムア
ルデヒド、メタノール、銅などを含むめつき液を
使用するめつき処理においては、これらの化学成
分を含有する老めつき液が排出される。
In plating processes that use chemical copper plating solutions, such as plating solutions containing EDTA, formaldehyde, methanol, copper, etc., aging solutions containing these chemical components are discharged.
この老めつき液中の有価物である銅とEDTA
は互いに結びついて錯化合物を形成しており、老
めつき液にホルムアルデヒド、水酸化ナトリウム
を添加し加熱下で銅を金属単体として析出回収し
た後、硫酸などの鉱酸を添加してEDTAを溶解
度の小さい遊離酸の形態として回収している。 Copper and EDTA are valuable substances in this aging liquid.
are combined with each other to form a complex compound. After formaldehyde and sodium hydroxide are added to the aging solution and copper is precipitated and recovered as an elemental metal under heating, mineral acids such as sulfuric acid are added to increase the solubility of EDTA. It is recovered in the form of a small free acid.
これら回収工程後の残廃水および回収物を洗浄
した後の洗浄水が廃水として排出される。 The residual wastewater after these recovery steps and the washing water after washing the recovered material are discharged as wastewater.
従来上記の廃水の浄化方法として、生物処理、
電解酸化や薬品（過酸化水素、次亜塩素酸ソーダ
など）添加による酸化およびこれらの組合せによ
つて行われていた。 Conventionally, biological treatment,
Oxidation was performed by electrolytic oxidation, oxidation by adding chemicals (hydrogen peroxide, sodium hypochlorite, etc.), or a combination of these.
しかし、これらの方法では例えば生物処理によ
るCOD除去率は30〜60％が限界であり、電解処
理では大きな電気量が必要であつた。またさらに
CODを除去するためには酸化薬品を大量に添加
する必要があつた。 However, in these methods, for example, the COD removal rate by biological treatment is limited to 30 to 60%, and electrolytic treatment requires a large amount of electricity. Even more
In order to remove COD, it was necessary to add large amounts of oxidizing chemicals.
この発明の目的は前記従来技術の欠点を解消
し、COD除去率の向上及び使用薬品の低減を得
ることができる。浄化処理方法を提供することに
ある。
An object of the present invention is to eliminate the drawbacks of the prior art, improve the COD removal rate, and reduce the amount of chemicals used. An object of the present invention is to provide a purification treatment method.
この発明は、第１に廃水中に含まれる有機化学
成分のうち未回収のEDTAおよび有価物の洗浄
水中のEDTAが廃水のCODの30〜40％占め、そ
のEDTAの大部分は溶解度の大きいナトリウム
塩の形態で存在していること、第２に廃水中の
EDTAは生物処理によつて分解が困難であるこ
と、第３に廃水に固形物である遊離酸態の
EDTAを少量添加し、鉱酸で約PH1.8に調節して
撹拌すると添加した遊離酸態が種晶となつてナト
リウム塩態のEDTAが溶解度の小さい遊離酸態
のEDTAとしてすみやかに析出し、分離すると
溶解度近くまでEDTAを除去できることを実験
によつて確認することによつてなされた。
First, among the organic chemical components contained in wastewater, unrecovered EDTA and EDTA in the water used to wash valuables account for 30 to 40% of the COD in wastewater, and most of the EDTA is sodium, which has a high solubility. The second is that it exists in the form of salt, and the second is that it is present in the wastewater.
EDTA is difficult to decompose through biological treatment, and thirdly, solid free acid forms are present in wastewater.
When a small amount of EDTA is added, the pH is adjusted to approximately 1.8 with mineral acid, and the mixture is stirred, the added free acid form becomes a seed crystal, and the sodium salt form of EDTA quickly precipitates as free acid form of EDTA with low solubility. This was done by confirming through experiments that EDTA can be removed to a level close to its solubility when separated.
このため、本廃水の浄化処理方法として廃水に
鉱酸を加えてPH1.8に調節し、廃水中のEDTAを
遊離酸態のEDTAにする反応工程と、前記遊離
酸態のEDTAを固液分離する工程および固液分
離した遊離酸態のEDTAの一部を前記反応工程
に戻す工程からなるEDTA除去工程を設け、
EDTAを除去した後、生物処理および化学的酸
化処理などの処理方法により廃水処理を行うよう
構成したものである。 Therefore, as a purification method for this wastewater, mineral acid is added to the wastewater to adjust the pH to 1.8, and the EDTA in the wastewater is converted into free acid EDTA, and the free acid EDTA is separated into solid and liquid. and a step of returning a portion of the solid-liquid separated free acid form EDTA to the reaction step,
After removing EDTA, the system is configured to perform wastewater treatment using treatment methods such as biological treatment and chemical oxidation treatment.
以下、本発明の実施例を図面に基づいて説明す
る。
Embodiments of the present invention will be described below based on the drawings.
第１図は本発明に係る廃水の浄化方法の実施例
を示す図である。 FIG. 1 is a diagram showing an embodiment of the wastewater purification method according to the present invention.
対象とするめつき廃水は化学銅めつき工程から
排出される老化学めつき液１をまず、銅回収工程
２で水酸化ナトリウム、ホルムアルデヒドを添加
し、加熱下で銅を金属銅として分離回収したあ
と、次いでその上澄液をEDTA回収工程５で鉱
酸（硫酸）を添加して約PH1.8に調節し、EDTA
を固形物である遊離酸態のEDTAとして分離回
収する。そのあとの上澄水である有価物回収残廃
水８および前記ふたつの回収工程２，５において
おのおのの回収物を工業用水またはイオン交換水
などで洗浄したあと排出される洗浄廃水４，７を
混合する。 The target plating wastewater is the aged matting solution 1 discharged from the chemical copper plating process, which is first added with sodium hydroxide and formaldehyde in the copper recovery process 2, and the copper is separated and recovered as metallic copper under heating. Then, the supernatant liquid is adjusted to approximately PH1.8 by adding mineral acid (sulfuric acid) in EDTA recovery step 5, and EDTA
is separated and recovered as solid free acid EDTA. After that, the residual wastewater 8 after recovering valuables, which is the supernatant water, is mixed with the washing wastewater 4, 7 discharged after washing each recovered material with industrial water, ion exchange water, etc. in the above two recovery steps 2, 5. .
なお前記した銅およびEDTAの回収工程２，
５は公知の技術によつて行われており、分離回
収、洗浄した銅３、EDTA６は回収工程２，５
外に引抜かれる。 In addition, the above-mentioned copper and EDTA recovery process 2,
Step 5 is carried out using a known technique, and the separated and recovered, washed copper 3 and EDTA 6 are recovered in steps 2 and 5.
pulled outside.
本発明は上記のめつき廃水（８および４，７の
混合水）をEDTA除去反応工程９に導びく。
EDTA除去反応工程９ではめつき廃水中に再度
鉱酸（硫酸）を添加し、PH1.8に調節して撹拌す
ることだけでも、EDTA固液分離工程１１に移
して残留するEDTAを分離除去することができ
るがEDTAをその溶解度近くまで遊離酸態の
EDTAにして固液分離するには、第２図に示す
ようにEDTA除去反応工程９の反応時間が５時
間と長時間を要する。 In the present invention, the above plating wastewater (mixed water of 8 and 4,7) is led to the EDTA removal reaction step 9.
In the EDTA removal reaction step 9, mineral acid (sulfuric acid) is added again to the plating wastewater, the pH is adjusted to 1.8, and even if it is only by stirring, the remaining EDTA can be separated and removed in the EDTA solid-liquid separation step 11. However, it is possible to reduce EDTA to near its solubility in the free acid form.
To convert EDTA into solid-liquid separation, the EDTA removal reaction step 9 requires a long reaction time of 5 hours, as shown in FIG.
そこで本実施例ではEDTA固液分離工程１１
から分離した遊離酸態のEDTAの一部をEDTA
除去反応工程９に戻す工程１２を設けた。第２図
に遊離酸態のEDTAの戻す量を変化させて
EDTA除去反応工程９の反応時間について検討
した結果を示す。第２図より乾物基準で1.5ｇ／
以上戻すことによつて反応時間が0.5〜1.0時間
に短縮されることがわかる。 Therefore, in this example, EDTA solid-liquid separation step 11
A part of the free acid EDTA separated from EDTA
A step 12 of returning to the removal reaction step 9 was provided. Figure 2 shows that the amount of free acid EDTA returned is varied.
The results of examining the reaction time of EDTA removal reaction step 9 are shown. From Figure 2, 1.5g/dry matter basis
It can be seen that the reaction time can be shortened to 0.5 to 1.0 hours by returning the reaction time to 0.5 to 1.0 hours.
このようにしてめつき廃水中のEDTAを除去
することによつてCODを25〜35％低減でき、あ
との廃水処理が容易となり処理薬品量が低減でき
る。 By removing EDTA from plating wastewater in this way, COD can be reduced by 25 to 35%, making subsequent wastewater treatment easier and reducing the amount of chemicals to be treated.
なお、EDTA固液分離工程９には遠心分離機、
脱水機などを用いてもよい。またろ過などの分離
方法を組み合わせるとさらによい。 Note that EDTA solid-liquid separation step 9 includes a centrifuge,
A dehydrator or the like may also be used. It is even better to combine separation methods such as filtration.
EDTA固液分離工程９からの上澄水は本実施
例では工業用水または生活系廃水（トイレ、シヤ
ワ、食堂廃水など）で希釈した後中和して微生物
によつて好気性条件下で有機物を分解する生物処
理装置１３で処理し、さらに排出基準によつては
過酸化水素と硫酸第１鉄を同時に添加し、強度化
剤である・OHラジカルを発生させて酸化処理す
るフエントン酸化装置１４で処理する。 In this example, the supernatant water from the EDTA solid-liquid separation step 9 is diluted with industrial water or domestic wastewater (toilet, shower, cafeteria wastewater, etc.), then neutralized, and organic matter is decomposed by microorganisms under aerobic conditions. In addition, depending on the emission standards, hydrogen peroxide and ferrous sulfate are added at the same time to generate OH radicals, which are strengthening agents, for oxidation treatment. do.
しかし他のCOD除去方法（電解酸化、オゾン
酸化および過酸化水素、次亜塩素酸ソーダなどを
添加する薬品酸化、高温高圧で酸化する湿式酸
化、活性炭吸着、特殊樹脂による吸着など）によ
つて処理してもよい。 However, other COD removal methods (electrolytic oxidation, ozone oxidation, chemical oxidation that adds hydrogen peroxide, sodium hypochlorite, etc., wet oxidation that oxidizes at high temperature and pressure, activated carbon adsorption, adsorption with special resin, etc.) You may.
実施例 １
有価物回収残廃水８、回収銅洗浄廃水４、回収
EDTA洗浄廃水７からなるCOD5500mg／のめ
つき廃水を、第１図に従い処理した。EDTA除
去反応槽９では、回収EDTA６を乾物基準で1.5
ｇ／添加し、硫酸を加えてPHを1.8に調節し、
反応時間は30分とした。EDTA沈でん槽１１か
らの上澄水のCODは3500mg／であり、原水に
対するCOD除去率は36％であつた。この上澄水
を10倍に希釈し生物処理装置１２で活性汚泥処理
（滞留時間7hr、MLSS4000mg／）した結果、処
理水のCODは93mg／であり、原水に対する
COD総量除去率は83％であつた。この活性汚泥
処理水を、さらにフエントン酸化装置で処理
（H2O2添加量210mg／、FeSO4添加量1340mg／
、反応時間15分、反応時のPH3.5、凝集時のPH
5.0）した結果、処理水のCODは20mg／であり、
原水に対するCOD総量除去率は96％となつた。Example 1 Valuables recovery residual wastewater 8, recovered copper washing wastewater 4, recovery
Plating wastewater consisting of EDTA washing wastewater 7 with a COD of 5500mg/was treated according to FIG. In the EDTA removal reaction tank 9, the recovered EDTA6 is reduced to 1.5 on a dry matter basis.
g/ and adjust the pH to 1.8 by adding sulfuric acid,
The reaction time was 30 minutes. The COD of the supernatant water from the EDTA sedimentation tank 11 was 3500 mg/, and the COD removal rate relative to the raw water was 36%. This supernatant water was diluted 10 times and treated with activated sludge in biological treatment equipment 12 (retention time 7 hours, MLSS 4000 mg/). As a result, the COD of the treated water was 93 mg/, compared to the raw water.
The total COD removal rate was 83%. This activated sludge treated water was further treated with a Fenton oxidizer (H 2 O 2 addition amount 210 mg/, FeSO 4 addition amount 1340 mg/
, reaction time 15 minutes, PH3.5 during reaction, PH during aggregation
5.0) As a result, the COD of the treated water is 20 mg/
The total removal rate of COD from raw water was 96%.
比較例 １
実施例１と同様のめつき廃水に対して、
EDTAを除去せずに、直接10倍に希釈し、以下、
実施例１と同様の条件で処理した。その結果、活
性汚泥処理水のCODは250mg／であり、原水に
対するCOD総量除去率は54％、フエントン酸化
処理水のCODは120mg／であり、原水に対する
COD総量除去率は78％であつた。また、実施例
１と同等のCOD総量除去率を得るためには、フ
エントン酸化処理におけるH2O2、FeSO4の添加
量を実施例１の場合の３倍を必要とした。Comparative Example 1 For plating wastewater similar to Example 1,
Directly dilute 10x without removing EDTA, below:
The treatment was carried out under the same conditions as in Example 1. As a result, the COD of activated sludge treated water was 250mg/, the total COD removal rate relative to raw water was 54%, and the COD of Fuenton oxidation treated water was 120mg/, relative to raw water.
The total COD removal rate was 78%. Further, in order to obtain the same total COD removal rate as in Example 1, the amount of H 2 O 2 and FeSO 4 added in the Fenton oxidation treatment was required to be three times that in Example 1.
実施例 ２
実施例１と同様のめつき廃水から、実施例１と
同様にEDTAを除去したのち、希釈せずにその
まま電解酸化処理（電流密度5A／ｄm2、極間距
離10mm、電気量90.7×103クーロン／）した結
果、処理水のCODは2100mg／であり、原水に
対するCOD除去率は62％であつた。Example 2 EDTA was removed in the same manner as in Example 1 from the same plating wastewater as in Example 1, and then subjected to electrolytic oxidation treatment without dilution (current density: 5 A/dm 2 , interelectrode distance: 10 mm, electricity consumption: 90.7 ×10 3 coulombs/), the COD of the treated water was 2100 mg/, and the COD removal rate relative to the raw water was 62%.
比較例 ２
実施例１と同様のめつき廃水を用い、EDTA
を除去せずに、そのまま実施例２と同様の条件で
電解酸化処理した。その結果、処理水のCODは
2900mg／であり、原水に対するCOD除去率は
47％であつた。また、実施例２と同等のCOD除
去率を得るためには、163×103クーロン／の電
気量が必要であることが判明した。Comparative Example 2 Using the same plating wastewater as in Example 1, EDTA
was subjected to electrolytic oxidation treatment under the same conditions as in Example 2 without removing it. As a result, the COD of the treated water is
2900mg/, and the COD removal rate for raw water is
It was 47%. Furthermore, it was found that in order to obtain a COD removal rate equivalent to that of Example 2, an amount of electricity of 163×10 3 coulombs/was required.
本発明によれば、めつき廃水のCODのうち30
〜40％を占めるEDTAをすみやかに除去し、そ
の後廃水処理を行うようにしたので、めつき廃水
のCOD除去率を高くすることができ、また使用
薬品、電気量を抵減できる。
According to the present invention, 30 of the COD of metsuki wastewater
By quickly removing EDTA, which accounts for ~40%, and then treating the wastewater, it is possible to increase the COD removal rate of plating wastewater and reduce the amount of chemicals and electricity used.
第１図は本発明の実施例を示す装置系統図、第
２図はEDTA除去反応工程において、回収
EDTAを添加した場合、添加しない場合の反応
時間と残留EDTAの関係を示すグラフである。
１……老めつき液、２……銅回収工程、４……
回収銅洗浄廃水、５……EDTA回収工程、７…
…回収EDTA洗浄廃水、８……有価物回収残廃
水、９……EDTA除去反応工程、１１……
EDTA固液分離工程、１２……生物処理装置、
１３……フエントン酸化装置。
Figure 1 is an apparatus system diagram showing an example of the present invention, and Figure 2 is a system diagram of an apparatus showing an example of the present invention.
It is a graph showing the relationship between reaction time and residual EDTA when EDTA is added and when EDTA is not added. 1... Aging liquid, 2... Copper recovery process, 4...
Recovered copper washing wastewater, 5... EDTA recovery process, 7...
... Recovered EDTA cleaning wastewater, 8... Valuables recovery residual wastewater, 9... EDTA removal reaction step, 11...
EDTA solid-liquid separation process, 12...biological treatment equipment,
13...Fuenton oxidizer.
Claims (1)
物として銅、EDTAを回収した後の有価物回収
残廃水および回収物を洗浄した後の洗浄廃水から
なるめつき廃水の浄化処理方法において、上記廃
水に鉱酸を加えて約PH1.8に調節し廃水中の残留
EDTAを固形物である遊離酸態のEDTAにする
反応工程と、前記遊離酸態のEDTAを固液分離
する工程および固液分離した遊離酸態のEDTA
の一部を前記反応工程に戻す工程からなる残留
EDTA除去工程を設け、残留EDTAを除去した
後廃水処理を行うように構成したことを特徴とす
るめつき廃水の浄化処理方法。1. In a method for purifying plating wastewater consisting of wastewater after recovering valuables after recovering copper and EDTA as valuables from an aged plating solution containing EDTA and copper, and washing wastewater after washing the recovered materials, the method described above Add mineral acid to the wastewater to adjust the pH to approximately 1.8 and remove the residue in the wastewater.
A reaction step to convert EDTA into a solid free acid EDTA, a step of solid-liquid separation of the free acid EDTA, and a solid-liquid separated free acid EDTA.
The residue consists of a step of returning a part of the
1. A method of purifying wastewater for plating, characterized in that an EDTA removal step is provided, and the wastewater is treated after residual EDTA is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5052584A JPS60193584A (en) | 1984-03-16 | 1984-03-16 | Purification treatment of waste plating water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5052584A JPS60193584A (en) | 1984-03-16 | 1984-03-16 | Purification treatment of waste plating water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60193584A JPS60193584A (en) | 1985-10-02 |
| JPH0137985B2 true JPH0137985B2 (en) | 1989-08-10 |
Family
ID=12861398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5052584A Granted JPS60193584A (en) | 1984-03-16 | 1984-03-16 | Purification treatment of waste plating water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60193584A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109574325A (en) * | 2018-11-20 | 2019-04-05 | 台州市宏民环保科技有限公司 | A kind of online water-saving method utilized with resource utilization of electro-coppering nickel waste water |
| CN115231679B (en) * | 2022-06-23 | 2024-01-30 | 无锡中天固废处置有限公司 | Method for separating copper and EDTA in electroplating waste liquid |
-
1984
- 1984-03-16 JP JP5052584A patent/JPS60193584A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60193584A (en) | 1985-10-02 |
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