JPH0361519B2 - - Google Patents
Info
- Publication number
- JPH0361519B2 JPH0361519B2 JP13362584A JP13362584A JPH0361519B2 JP H0361519 B2 JPH0361519 B2 JP H0361519B2 JP 13362584 A JP13362584 A JP 13362584A JP 13362584 A JP13362584 A JP 13362584A JP H0361519 B2 JPH0361519 B2 JP H0361519B2
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- hydroxide
- chemical cleaning
- liquid
- calcium
- 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
- 239000007788 liquid Substances 0.000 claims description 54
- 239000002699 waste material Substances 0.000 claims description 39
- 238000004140 cleaning Methods 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 10
- 229910001385 heavy metal Inorganic materials 0.000 claims description 9
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 229940043430 calcium compound Drugs 0.000 claims description 5
- 150000001674 calcium compounds Chemical class 0.000 claims description 5
- 229960004887 ferric hydroxide Drugs 0.000 claims description 5
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims description 5
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 claims description 5
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 230000003449 preventive effect Effects 0.000 claims description 4
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 3
- 235000011010 calcium phosphates Nutrition 0.000 claims description 3
- 150000004692 metal hydroxides Chemical class 0.000 claims description 3
- 235000021317 phosphate Nutrition 0.000 claims description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000002351 wastewater Substances 0.000 description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 9
- 239000002244 precipitate Substances 0.000 description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 6
- 239000000920 calcium hydroxide Substances 0.000 description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013527 degreasing agent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 238000010979 pH adjustment Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000004912 1,5-cyclooctadiene Substances 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- HDMKAUUMGFGBRJ-UHFFFAOYSA-N iron;dihydrate Chemical compound O.O.[Fe] HDMKAUUMGFGBRJ-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229940085991 phosphate ion Drugs 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 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
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Water Treatment By Sorption (AREA)
- Removal Of Specific Substances (AREA)
Description
（産業上の利用分野）
本発明は、塩酸洗浄液及びりん酸系の防錆液を
含む化学洗浄廃液の処理方法に関する。
（従来の技術）
火力プラントのボイラの金属表面に付着した鉄
を主成分とする酸化物のスケールを除去してプラ
ント類の安全運転、保全管理を目的として化学洗
浄が行われている。
化学洗浄液組成の一例として、塩酸に酸腐食抑
制剤（インヒビター）あるいは脱脂剤等が添加さ
れており、また酸洗浄液後の金属表面を一時的に
防錆する防錆処理において、それら化学洗浄後の
廃液の組成と性状の一例を示せば第１表の通りで
ある。また、排水基準値は地域自治体との公害防
止協定などで決められており、その例を示せば第
２表の通りである。
第１表から判るように化学洗浄廃液には有害成
分である遊離酸、COD、鉄及びりん酸などが多
量溶解されているので、このような化学洗浄廃液
は公害上そのまま放流することは絶対に許されな
い。
一方、放流水質は第２表に例示されるように各
地域自治体との公害防止協定などで決められた規
制値まで浄化処理することが必要である。
従来は、このような化学洗浄廃液の処理工程に
おいて、
(1) 水酸化ナトリウムあるいは水酸化カルシウム
などのアルカリ剤を加えてPH11以上に調整し重
金属を沈殿生成する。
(Industrial Application Field) The present invention relates to a method for treating chemical cleaning waste liquid containing a hydrochloric acid cleaning liquid and a phosphoric acid-based rust preventive liquid. (Prior Art) Chemical cleaning is performed for the purpose of safe operation and maintenance management of plants by removing scales of oxides mainly composed of iron adhering to the metal surfaces of boilers of thermal power plants. An example of a chemical cleaning solution composition is hydrochloric acid with an acid corrosion inhibitor or degreaser added. Table 1 shows an example of the composition and properties of the waste liquid. In addition, wastewater standard values are determined by pollution prevention agreements with local governments, examples of which are shown in Table 2. As can be seen from Table 1, chemical cleaning waste liquid contains large amounts of harmful components such as free acid, COD, iron, and phosphoric acid dissolved in it, so such chemical cleaning waste liquid should never be discharged as it is due to pollution concerns. Unacceptable. On the other hand, as shown in Table 2, it is necessary to purify the quality of the discharged water to the regulatory values determined by pollution prevention agreements with local governments. Conventionally, in the process of treating such chemical cleaning waste liquid, (1) an alkaline agent such as sodium hydroxide or calcium hydroxide is added to adjust the pH to 11 or higher, and heavy metals are precipitated.
【表】【table】
【表】
(2) COD除去：エアレーシヨンしながら過酸化
水素、次亜塩素酸ナトリウム、さらし粉等の酸
化剤をCODに対し当量以上添加して、CODを
10ppm程度まで処理する。
(3) PH調整剤：(2)で処理した上澄液の放流に際し
ては、硫酸または塩酸等の酸で中和しながら放
流する。
（発明が解決しようとする問題点）
上記(1)〜(3)の処理工程によれば有害物質は、第
２表の排水基準値内まで低下できるが、廃液処理
工程が非常に繁雑であり、処理に長時間を要しコ
スト高となる欠点を有している。
本発明は上記の問題点を解消するためになされ
たもので、その目的とするところは、従来の塩酸
洗浄液及びりん酸系防錆液を含む化学洗浄廃液の
処理に関する欠点を排除すべく廃液中の重金属、
りん酸塩、COD等の有害物質を第２表の排水基
準値内まで除去し、かつ無色透明の処理水を簡単
に得ることができる化学洗浄廃液の処理方法を提
供することにある。
（問題点を解決するための手段）
本発明は、塩酸洗浄液及びりん酸系の防錆液を
含む化学洗浄廃液を処理するにあたり、上記廃液
に活性炭を廃液１m3に対し0.1Kg以上添加したの
ち、空気吹き込みによつて廃液を撹拌しながら水
酸化カルシウム、酸化カルシウムあるいは塩化カ
ルシウム等のカルシウム化合物及び水酸化ナトリ
ウムあるいは水酸化カリウム等のアルカリ剤を添
加してPH７以上好ましくは8.5に調整することに
より、同廃液中に溶解しているりん酸塩及び重金
属をりん酸カルシウム及び重金属水酸化物として
沈殿生成させ、生成した水酸化第一鉄が水酸化第
二鉄に酸化するまで空気吹き込みを行う化学洗浄
廃液の処理方法である。
（作用）
第１表に示した組成及び性状の化学洗浄廃液を
対象として説明する。先ず廃液を空気吹き込みに
よつて強制的に撹拌しながら活性炭を廃液１m3に
対し0.1Kg以上添加して約１時間でCOD成分を吸
着除去したのち、同廃液に水酸化カルシウム、酸
化カルシウムあるいは塩化カルシウムなどのカル
シウム化合物を廃液中のりん酸イオンに対し１当
量以上添加し、さらに水酸化ナトリウムあるいは
水酸化カリウムなどのアルカリ剤を添加してPH７
以上好ましくは７〜8.5に調整してりん酸及び重
金属イオンをりん酸カルシウム及び重金属の水酸
化物として沈殿生成させ、生成した水酸化第一鉄
の沈殿が水酸化第二鉄の沈殿に十分酸化するまで
空気吹き込みによつて強制撹拌する。次いで空気
吹き込みを止め、セツトリングにより上澄液と沈
殿物に完全分離したのち、上澄液はポンプを使用
してそのまま放流し、活性炭を含む沈殿物は遠心
分離機あるいはプレスフイルター機により脱水
し、固形分として処理する。なお上記廃液処理に
おいて上澄液と沈殿物を分離する場合沈殿物の凝
集沈降を促進するために高分子凝集剤を添加して
もよい。
第１表に示す化学洗浄廃液中のCOD負荷成分
はインヒビターと脱脂剤とからであるが、活性炭
の添加により、CODが効果的に除去されるのは
活性炭にCOD負荷成分が有効に吸着するためと
考えられる。
次に水酸化カルシウム、酸化カルシウム、塩化
カルシウムなどのカルシウム化合物及び水酸化ナ
トリウム、水酸化カリウムなどのアルカリ剤を併
用添加して廃液中に溶解しているりん酸、鉄など
の重金属がほぼ完全に除去できるのはりん酸カル
シウム〔Ca3（PO4）2〕及び鉄の水酸化物〔Fe
（OH）2〕の沈殿を生成するからである。空気吹
き込み理由は水酸化第一鉄〔Fe（OH）2〕を水酸
化第二鉄〔Fe（OH）3〕に酸化することにより、
廃液中の溶解鉄を下げるのと処理時の廃液を強制
的に撹拌して処理効果を高めるためである。
（発明の効果）
本発明は上記のようにカルシウム化合物及びア
ルカリ剤を添加する前に活性炭を化学洗浄廃液に
添加することにより、COD成分を効果的に除去
できるのでCODの酸化剤の添加を必要としない
ばかりでなく、さらに最終的な廃液処理でのPHは
排水基準値内の７〜8.5に調整すればよいので、
放流に際し何らPH調整の必要がない等の利点があ
り、火力プラント、化学プラント等のボイラその
他の金属製品の塩酸洗浄液及び防錆液を含む化学
洗浄廃液の処理等に利用できるものである。
（実施例）
第１表に示した組成及び性状の化学洗浄廃液を
対象として行つたもので、これら廃液１に粒状
の活性炭添加比を種々かえて添加し、空気吹き込
みによつて強制的に１時間撹拌したのち、前記廃
液に水酸化カルシウムを廃液中のりん酸イオンに
対し1.1当量添加し、さらに40％水酸化ナトリウ
ム溶液を加えてPHを7.0〜11に調整し、りん酸カ
ルシウム、水酸化第一鉄の沈殿を生成させた。
次に空気吹き込みによつて活性炭を含む沈殿物
とともに液を強制撹拌して水酸化第一鉄が、水酸
化第二鉄の沈殿に十分酸化したのち、沈殿物を沈
降させ、その処理水のCOD、溶解鉄、りん酸及
びSSを測定したところ、第３表の如き結果を得
た。
なお、塩酸洗浄液のインヒビターには、ヒビロ
ンＡ−100（アミン系酸洗用防食剤、杉村化学工業
株式会社製、商品名）を用いているが、他社製品
を使用した場合でも第３表と同等の結果が得ら
れ、脱脂剤には、プライサーフA215C（ポリエチ
レングリコールエーテル、第一工業製薬株式会社
製、商品名）を用いているが他社製品を使用した
場合でも、第３表と同等の結果が得られた。又、
廃液に添加する上記活性炭は粉末状のものでもよ
い。
試験結果の第３表より下記のことが判明した。
(1) 試験番号２〜10の化学洗浄廃液に於て廃液１
m3に対し粒状の活性炭を0.1Kg以上添加し、ま
た廃液中のりん酸イオンに対し水酸化カルシウ
ムを当量以上し、さらに水酸化ナトリウム溶液
でPHを７以上、好ましくは７〜8.5に調整する
ことにより、処理水のCOD、溶解鉄、銅、り
ん酸イオン、SSの何れも第２表の排水基準値
を十分に満足するので処理済みの液は排出に際
し希釈及びPH調整の必要もなくそのまま海域に
放流することができる。
(2) 試験番号11〜13の処理に於てもPHを除き排水
基準値を十分に満足するが、放流に際し硫酸ま
たは塩酸等の酸で排水基準内PHに調整する必要
があるため好ましい方法とはいえない。[Table] (2) COD removal: COD is removed by adding oxidizing agents such as hydrogen peroxide, sodium hypochlorite, and bleaching powder in an equivalent amount or more to COD while performing aeration.
Process up to about 10ppm. (3) PH adjuster: When discharging the supernatant liquid treated in (2), neutralize it with an acid such as sulfuric acid or hydrochloric acid before discharging it. (Problems to be Solved by the Invention) According to the treatment processes (1) to (3) above, harmful substances can be reduced to within the wastewater standard values shown in Table 2, but the wastewater treatment process is extremely complicated. However, it has the disadvantage that the processing takes a long time and the cost is high. The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the disadvantages associated with the treatment of chemical cleaning waste liquids containing conventional hydrochloric acid cleaning liquids and phosphoric acid-based rust preventive liquids. heavy metals,
It is an object of the present invention to provide a method for treating chemical cleaning waste liquid, which can remove harmful substances such as phosphates and COD to within the wastewater standard values shown in Table 2, and easily obtain colorless and transparent treated water. (Means for Solving the Problems) In the present invention, when treating chemical cleaning waste liquid containing a hydrochloric acid cleaning liquid and a phosphoric acid-based rust preventive liquid, activated carbon is added to the waste liquid in an amount of 0.1 kg or more per 1 m 3 of the waste liquid. , by adding a calcium compound such as calcium hydroxide, calcium oxide or calcium chloride, and an alkaline agent such as sodium hydroxide or potassium hydroxide while stirring the waste liquid by blowing air to adjust the pH to 7 or more, preferably 8.5. , a chemical method in which phosphates and heavy metals dissolved in the waste liquid are precipitated and formed as calcium phosphate and heavy metal hydroxide, and air is blown in until the generated ferrous hydroxide is oxidized to ferric hydroxide. This is a method for processing cleaning waste liquid. (Function) The following description deals with chemical cleaning waste liquid having the composition and properties shown in Table 1. First, while the waste liquid is forcibly stirred by air blowing, 0.1 kg or more of activated carbon is added to 1 m 3 of the waste liquid to adsorb and remove COD components in about 1 hour, and then calcium hydroxide, calcium oxide, or chloride is added to the waste liquid. Add a calcium compound such as calcium in an amount of 1 equivalent or more to the phosphate ion in the waste liquid, and further add an alkaline agent such as sodium hydroxide or potassium hydroxide to raise the pH to 7.
The above is preferably adjusted to 7 to 8.5 to precipitate phosphoric acid and heavy metal ions as calcium phosphate and heavy metal hydroxide, and the resulting ferrous hydroxide precipitate is sufficiently oxidized to ferric hydroxide precipitate. Force stirring by blowing air until the mixture is mixed. Next, the air blowing is stopped, and after completely separating the supernatant liquid and precipitate by settling, the supernatant liquid is discharged as is using a pump, and the precipitate containing activated carbon is dehydrated using a centrifuge or press filter machine. , treated as solids. In addition, when separating the supernatant liquid and the precipitate in the above-mentioned waste liquid treatment, a polymer flocculant may be added to promote coagulation and sedimentation of the precipitate. The COD-loaded components in the chemical cleaning wastewater shown in Table 1 come from inhibitors and degreasers, but COD is effectively removed by the addition of activated carbon because the COD-loaded components are effectively adsorbed by the activated carbon. it is conceivable that. Next, calcium compounds such as calcium hydroxide, calcium oxide, and calcium chloride and alkaline agents such as sodium hydroxide and potassium hydroxide are added together to almost completely eliminate heavy metals such as phosphoric acid and iron dissolved in the waste liquid. Calcium phosphate [Ca 3 (PO 4 ) 2 ] and iron hydroxide [Fe
(OH) 2 ]. The reason for air blowing is that ferrous hydroxide [Fe(OH) 2 ] is oxidized to ferric hydroxide [Fe(OH) 3 ].
This is to lower the amount of dissolved iron in the waste liquid and to forcibly stir the waste liquid during treatment to increase the treatment effect. (Effect of the invention) As described above, the present invention can effectively remove COD components by adding activated carbon to the chemical cleaning waste liquid before adding calcium compounds and alkaline agents, so it is not necessary to add a COD oxidizing agent. Not only does this not only prevent wastewater from becoming a wastewater, but also the pH in the final wastewater treatment can be adjusted to between 7 and 8.5, which is within the wastewater standard value.
It has the advantage of not requiring any PH adjustment when being discharged, and can be used to treat chemical cleaning waste liquids containing hydrochloric acid cleaning liquids and anti-corrosion liquids for boilers and other metal products in thermal power plants, chemical plants, etc. (Example) This was carried out using chemical cleaning waste liquids having the composition and properties shown in Table 1. Granular activated carbon was added to these waste liquids at various addition ratios, and air was forcibly blown into the waste liquid 1. After stirring for an hour, calcium hydroxide was added to the waste liquid in an amount of 1.1 equivalents based on the phosphate ions in the waste liquid, and 40% sodium hydroxide solution was added to adjust the pH to 7.0 to 11. A ferrous precipitate formed. Next, the liquid is forcibly stirred together with the precipitate containing activated carbon by air blowing, and after the ferrous hydroxide is sufficiently oxidized to precipitate of ferric hydroxide, the precipitate is allowed to settle, and the COD of the treated water is , dissolved iron, phosphoric acid and SS were measured, and the results shown in Table 3 were obtained. Hibilon A-100 (amine-based pickling anticorrosive agent, manufactured by Sugimura Chemical Industry Co., Ltd., trade name) is used as the inhibitor for the hydrochloric acid cleaning solution, but even if other companies' products are used, the results are equivalent to those shown in Table 3. Although we used Plysurf A215C (polyethylene glycol ether, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., trade name) as the degreasing agent, the same results as in Table 3 were obtained even when other companies' products were used. was gotten. or,
The activated carbon added to the waste liquid may be in powder form. Table 3 of the test results revealed the following. (1) Waste liquid 1 in chemical cleaning waste liquid of test numbers 2 to 10
Add at least 0.1 kg of granular activated carbon per m3 , add at least an equivalent amount of calcium hydroxide to the phosphate ions in the waste liquid, and adjust the pH to 7 or higher, preferably 7 to 8.5, with sodium hydroxide solution. As a result, the COD, dissolved iron, copper, phosphate ions, and SS of the treated water fully satisfy the wastewater standard values in Table 2, so the treated liquid can be discharged as is without the need for dilution or PH adjustment. It can be released into the ocean. (2) Although the treatments in test numbers 11 to 13 fully satisfy the wastewater standard values except for PH, it is not the preferred method because it is necessary to adjust the pH to within the wastewater standard using acid such as sulfuric acid or hydrochloric acid before discharge. No, no.
Claims (1)
浄廃液を処理するに際し、同廃液に活性炭を廃液
１m3に対し0.1Kg以上添加したのち、空気を吹き
込み、廃液を撹拌しながらカルシウム化合物およ
びアルカリ剤を添加してPH７以上好ましくは7.0
〜8.5に調整し、廃液中に溶解しているりん酸塩
及び重金属をりん酸カルシウム及び重金属水酸化
物として沈殿生成させ、生成した水酸化第一鉄が
水酸化第二鉄に酸化するまで空気吹き込みを行う
ことを特徴とする化学洗浄廃液の処理方法。1 When treating chemical cleaning waste liquid containing hydrochloric acid cleaning solution and phosphoric acid-based rust preventive liquid, add at least 0.1 kg of activated carbon per 1 m3 of waste liquid to the waste liquid, then blow air and stir the waste liquid to remove calcium compounds and alkalis. PH7 or higher preferably 7.0 by adding agent
~ 8.5, the phosphates and heavy metals dissolved in the waste liquid are precipitated as calcium phosphate and heavy metal hydroxide, and air is heated until the generated ferrous hydroxide is oxidized to ferric hydroxide. A method for treating chemical cleaning waste liquid, characterized by carrying out blowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13362584A JPS6111196A (en) | 1984-06-28 | 1984-06-28 | Treatment of waste liquid of chemical cleaning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13362584A JPS6111196A (en) | 1984-06-28 | 1984-06-28 | Treatment of waste liquid of chemical cleaning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6111196A JPS6111196A (en) | 1986-01-18 |
| JPH0361519B2 true JPH0361519B2 (en) | 1991-09-20 |
Family
ID=15109189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13362584A Granted JPS6111196A (en) | 1984-06-28 | 1984-06-28 | Treatment of waste liquid of chemical cleaning |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6111196A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002036500A2 (en) * | 2000-11-02 | 2002-05-10 | Otv Sa | Method and apparatus for treatment of water and wastewater |
-
1984
- 1984-06-28 JP JP13362584A patent/JPS6111196A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6111196A (en) | 1986-01-18 |
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