JP5867538B2 - Treatment method for wastewater containing cyanide and ammonia - Google Patents
Treatment method for wastewater containing cyanide and ammonia Download PDFInfo
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- JP5867538B2 JP5867538B2 JP2014084692A JP2014084692A JP5867538B2 JP 5867538 B2 JP5867538 B2 JP 5867538B2 JP 2014084692 A JP2014084692 A JP 2014084692A JP 2014084692 A JP2014084692 A JP 2014084692A JP 5867538 B2 JP5867538 B2 JP 5867538B2
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- ammonia
- hypobromite
- cyanide
- hypochlorite
- sodium
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims description 74
- 239000002351 wastewater Substances 0.000 title claims description 44
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 title claims description 41
- 229910021529 ammonia Inorganic materials 0.000 title claims description 37
- 238000000034 method Methods 0.000 title claims description 32
- JGJLWPGRMCADHB-UHFFFAOYSA-N hypobromite Chemical compound Br[O-] JGJLWPGRMCADHB-UHFFFAOYSA-N 0.000 claims description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 38
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical group [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 30
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical group [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 26
- 239000000126 substance Substances 0.000 claims description 25
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 22
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 21
- 229910052742 iron Inorganic materials 0.000 claims description 19
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims description 16
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 6
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 5
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052794 bromium Inorganic materials 0.000 claims description 5
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 claims description 4
- 239000008155 medical solution Substances 0.000 claims description 4
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 32
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 22
- 229910052801 chlorine Inorganic materials 0.000 description 22
- 239000000460 chlorine Substances 0.000 description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- CRWJEUDFKNYSBX-UHFFFAOYSA-N sodium;hypobromite Chemical compound [Na+].Br[O-] CRWJEUDFKNYSBX-UHFFFAOYSA-N 0.000 description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 14
- 229910019093 NaOCl Inorganic materials 0.000 description 9
- -1 cyanide compound Chemical class 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- 230000035484 reaction time Effects 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 150000007661 iron cyano complex Chemical class 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 6
- FNXLCIKXHOPCKH-UHFFFAOYSA-N bromamine Chemical compound BrN FNXLCIKXHOPCKH-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007800 oxidant agent Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000012320 chlorinating reagent Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- CUILPNURFADTPE-UHFFFAOYSA-N hypobromous acid Chemical compound BrO CUILPNURFADTPE-UHFFFAOYSA-N 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 1
- LIXWSNVLHFNXAJ-UHFFFAOYSA-N sodium;oxidoazaniumylidynemethane Chemical compound [Na+].[O-][N+]#[C-] LIXWSNVLHFNXAJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/20—Oxygen compounds of bromine
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
Description
本発明はシアン及びアンモニア含有排水の処理方法に係り、特に、溶解性鉄を含有するシアン及びアンモニア含有排水をアルカリ塩素法の改良法により処理する方法に関する。 The present invention relates to a method for treating cyanide and ammonia-containing wastewater, and more particularly to a method for treating cyanide and ammonia-containing wastewater containing soluble iron by an improved alkali chlorine method.
めっき工場、製鉄所、製錬所、発電所、コークス製造工場などの産業施設から排出されるシアン含有排水の処理方法として、現在最も広く採用されている方法は、アルカリ塩素法である。この方法では、塩素源、例えば次亜塩素酸ナトリウムをアルカリ性下でシアン含有排水に添加して排水中のシアンを酸化処理する（特許文献１，２）。 The most widely used method for treating cyanide-containing wastewater discharged from industrial facilities such as plating factories, ironworks, smelters, power plants, and coke factories is the alkali chlorine method. In this method, a chlorine source, for example, sodium hypochlorite is added to cyanide-containing wastewater under alkalinity to oxidize cyanide in the wastewater (Patent Documents 1 and 2).
特許文献１のアルカリ塩素法では、以下に示すようなｐＨ及びＯＲＰ制御値における２段階の反応でシアン化合物を酸化分解する。 In the alkali chlorine method of Patent Document 1, the cyanide compound is oxidatively decomposed by a two-stage reaction at pH and ORP control values as shown below.
一段反応：ｐＨ１０以上，ＯＲＰ制御値３００〜３５０ｍＶ
ＮａＣＮ＋ＮａＯＣｌ→ＮａＣＮＯ＋ＮａＣｌ …（１）
二段反応：ｐＨ７〜８，ＯＲＰ制御値６００〜６５０ｍＶ
２ＮａＣＮＯ＋３ＮａＣｌＯ＋Ｈ２Ｏ→Ｎ２＋３ＮａＣｌ＋２ＮａＨＣＯ３ …（２）
One-step reaction: pH 10 or higher, ORP control value 300 to 350 mV
NaCN + NaOCl → NaCNO + NaCl (1)
Two-stage reaction: pH 7-8, ORP control value 600-650 mV
2NaCNO + 3NaClO + H 2 O → N 2 + 3NaCl + 2NaHCO 3 (2)
特許文献２には、遊離シアン、錯シアン及びアンモニアを含むシアン含有排水を８０℃未満の第１酸化工程と８０℃以上の第２酸化工程との２段工程を有するアルカリ塩素法によって処理する方法が記載されている。 Patent Document 2 discloses a method of treating cyanide-containing wastewater containing free cyanide, complex cyanide and ammonia by an alkali chlorine method having a two-stage process of a first oxidation process of less than 80 ° C. and a second oxidation process of 80 ° C. or more. Is described.
特許文献３には、シアン及びアンモニウムイオン含有排水をｐＨ１１以上にてアルカリ塩素法により処理する方法が記載されている。この特許文献３の方法では、シアン化合物分解反応後も遊離残留塩素濃度を０．１ｍｇ／Ｌ以上となるように塩素源を添加する。特許文献３には、シアン及びアンモニウムイオン含有排水中の溶解性鉄の大部分は鉄シアノ錯体として存在していること、この鉄シアノ錯体はアルカリ塩素法では分解されにくいこと、従って、シアン及びアンモニウムイオン含有排水中の溶解性鉄濃度は０．４ｍｇ／Ｌ以下であるべきことが記載されている（００２５段落）。 Patent Document 3 describes a method of treating cyanide and ammonium ion-containing wastewater at pH 11 or higher by an alkali chlorine method. In the method of Patent Document 3, a chlorine source is added so that the free residual chlorine concentration is 0.1 mg / L or more even after the cyanide decomposition reaction. In Patent Document 3, most of the soluble iron in wastewater containing cyanide and ammonium ions exists as an iron cyano complex, and this iron cyano complex is hardly decomposed by the alkali chlorine method. It is described that the concentration of soluble iron in ion-containing wastewater should be 0.4 mg / L or less (paragraph 0025).
上記特許文献３に記載の通り、シアン及びアンモニウムイオン含有排水中の溶解性鉄濃度が高い場合、従来のアルカリ塩素法では、シアンが十分には酸化分解されない。 As described in Patent Document 3, when the concentration of soluble iron in the wastewater containing cyanide and ammonium ions is high, cyan is not sufficiently oxidized and decomposed by the conventional alkali chlorine method.
さらに上記特許文献３の方法では、シアン及びアンモニウムイオン含有排水をｐＨ１１以上とするためのアルカリ薬剤コストが嵩むという課題がある。さらに塩素源の添加量によっては塩素ガスが発生するおそれがある。 Furthermore, the method of Patent Document 3 has a problem that the cost of alkaline chemicals for increasing the cyanide and ammonium ion-containing wastewater to pH 11 or higher is increased. Further, depending on the amount of chlorine source added, chlorine gas may be generated.
本発明は、排水中の溶解性鉄濃度が高い場合でも、シアンが十分に分解されるシアン及びアンモニア含有排水の処理方法を提供することを第１の目的とする。 The first object of the present invention is to provide a method for treating cyanide and ammonia-containing wastewater in which cyan is sufficiently decomposed even when the concentration of soluble iron in the wastewater is high.
また、本発明は、ｐＨ１１以下でもシアンを十分に酸化分解することができるシアン及びアンモニア含有排水の処理方法を提供することを第２の目的とする。 A second object of the present invention is to provide a treatment method for wastewater containing cyanide and ammonia that can sufficiently oxidatively decompose cyanide even at a pH of 11 or less.
本発明のシアン及びアンモニア含有排水の処理方法は、シアン及びアンモニア含有排水に次亜臭素酸及び／又は次亜塩素酸を含む薬液を添加して、ｐＨ９〜１１でシアンを酸化分解する工程を有するものである。なお、本発明においては、「アンモニア」とは「アンモニウムイオン」を含むものとする。また、「シアン」とは、「シアン化物イオン」及び「シアノ錯体などのシアン化合物」を表す。 Method of processing cyan and ammonia-containing waste water of the present invention, by adding a chemical solution containing hypobromite and / or hypochlorite in the cyan and ammonia-containing waste water, having an oxidation decomposing step the cyan pH9~11 Is. In the present invention, “ammonia” includes “ammonium ions”. “Cyan” represents “cyanide ion” and “cyanide compound such as cyano complex”.
本発明の一態様では、薬液は酸化剤成分として、実質的に次亜臭素酸及び／又は次亜臭素酸塩のみを含む。本発明の別の一態様では、薬液は、酸化剤成分として、次亜臭素酸及び／又は次亜臭素酸塩と、次亜塩素酸及び／又は次亜塩素酸塩とを含む。 In one embodiment of the present invention, the chemical liquid substantially contains only hypobromite and / or hypobromite as the oxidant component. In another one aspect | mode of this invention, a chemical | medical solution contains hypochlorous acid and / or hypobromite, and hypochlorous acid and / or hypochlorite as an oxidizing agent component.
本発明のシアン及びアンモニア含有排水の処理方法では、次亜臭素酸イオンによりアンモニアが次式の反応に従って酸化分解される。 In the method for treating wastewater containing cyanide and ammonia according to the present invention, ammonia is oxidatively decomposed by hypobromite ions according to the reaction of the following formula.
ＯＢｒ−＋ＮＨ４ ＋→ＮＨ３Ｂｒ＋＋ＯＨ−…………………………（３）
２ＮＨ３Ｂｒ＋＋ＯＢｒ−→Ｎ２＋３Ｂｒ−＋Ｈ２Ｏ＋２Ｈ＋………（４）
２ＮＨ４ ＋＋３ＯＢｒ−→Ｎ２＋３Ｂｒ−＋３Ｈ２Ｏ＋２Ｈ＋………（５）
また、次亜臭素酸の酸化力によりシアンが分解される。
OBr − + NH 4 + → NH 3 Br + + OH − (3)
2NH 3 Br + + OBr − → N 2 + 3Br − + H 2 O + 2H + (4)
2NH 4 + + 3OBr − → N 2 + 3Br − + 3H 2 O + 2H + (5)
Cyanide is decomposed by the oxidizing power of hypobromite.
本発明方法では、（３）式の通り、次亜臭素酸イオンがアンモニアと反応しブロマミン（ブロモアミン）が生成するが、塩素剤で生成するクロラミンよりブロマミンは酸化力が強い。そのため、ブロマミンでもシアンの分解が可能となる。 In the method of the present invention, as shown in the formula (3), hypobromite ions react with ammonia to produce bromamine (bromoamine), but bromamine has a stronger oxidizing power than chloramine produced by a chlorine agent. Therefore, cyanide can be decomposed even with bromamine.
本発明では、塩素剤を添加しないか又はその添加量が少ないので、結合塩素と有機物との反応によるシアン生成が防止又は抑制され、シアン濃度が十分に低くなるように処理が行われる。 In the present invention, since no chlorinating agent is added or the amount of the chlorinating agent is small, cyan generation due to the reaction between bound chlorine and an organic substance is prevented or suppressed, and the treatment is performed so that the cyan density is sufficiently low.
本発明では、鉄シアノ錯体も次亜臭素酸イオンやブロマミンの強力な酸化作用により分解される。従って、シアン及びアンモニア含有排水中の溶解性鉄濃度が０．１ｍｇ／Ｌ以上と高い場合であっても、シアンが十分に分解される。また、ｐＨ１１以下であってもシアンが十分に分解される。 In the present invention, the iron cyano complex is also decomposed by the strong oxidizing action of hypobromite ions and bromamine. Therefore, even if the soluble iron concentration in the wastewater containing cyanide and ammonia is as high as 0.1 mg / L or more, cyan is sufficiently decomposed. Further, cyan is sufficiently decomposed even at a pH of 11 or less.
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.
本発明において、処理対象となるシアン及びアンモニア含有排水は、製鉄所排水、めっき工場排水、電子工業排水、石油精製工場排水などのシアン及びアンモニア含有排水が例示されるが、これに限定されない。 In the present invention, the cyan and ammonia-containing wastewater to be treated is exemplified by cyanide and ammonia-containing wastewater such as ironworks wastewater, plating factory wastewater, electronic industrial wastewater, and oil refinery factory wastewater, but is not limited thereto.
通常の場合、このようなシアン及びアンモニア含有排水の全シアン濃度は０．１〜４００ｍｇ／Ｌ程度であり、アンモニアの濃度はアンモニウムイオンとして１０ｍｇ／Ｌ以上例えば１０〜１００００ｍｇ／Ｌ程度である。またｐＨは６〜１０程度である。 Normally, the total cyan concentration of such cyan and ammonia-containing waste water is about 0.1 to 400 mg / L, and the ammonia concentration is 10 mg / L or more, for example, about 10 to 10000 mg / L as ammonium ions. Moreover, pH is about 6-10.
シアン及びアンモニア含有排水は、石炭やコークス由来などの有機物を含有する場合がある。有機物の濃度は、通常、１ｍｇ／Ｌ以上例えば１〜１５００ｍｇ／Ｌ程度である。 Cyanide and ammonia containing waste water may contain organic substances, such as coal and coke origin. The density | concentration of organic substance is 1 mg / L or more normally, for example, about 1-1500 mg / L.
シアン化合物が含まれるｐＨ中性以上の工場廃水中に含まれる溶解性鉄は、大部分が鉄シアノ錯体で存在している。本発明方法によるシアン化合物酸化分解反応では鉄シアノ錯体も分解されるため、本発明方法が処理対象とするシアン含有排水は、溶解性鉄を０．１ｍｇ／Ｌ以上、例えば０．１〜５ｍｇ／Ｌとりわけ１〜３ｍｇ／Ｌ含んでいても十分にシアン及びアンモニアを分解処理することができる。 Most of the soluble iron contained in industrial wastewater containing a cyanide and having a pH neutrality or higher exists as an iron cyano complex. In the cyanide oxidative decomposition reaction according to the method of the present invention, the iron cyano complex is also decomposed. L, particularly 1 to 3 mg / L, can sufficiently decompose cyanide and ammonia.
次亜臭素酸及び／又は次亜臭素酸塩が添加されて処理されているときのシアン及びアンモニア含有排水のｐＨはＨＣＮガスの発生を避ける観点から９以上であることが好ましい。 From the viewpoint of avoiding the generation of HCN gas, it is preferable that the pH of the wastewater containing cyanide and ammonia when hypobromite and / or hypobromite is added and treated.
次亜臭素酸及び／又は次亜臭素酸塩を添加した後のシアン及びアンモニア含有排水のＯＲＰは４００ｍＶ以上、好ましくは５００ｍＶ以上とする。ＯＲＰを４００ｍＶ以上とすることにより、水系内の酸化力を維持し、難分解性の鉄シアノ錯体を分解することが可能となる。一方、ＯＲＰの上限に関しては、薬剤コストの観点から８００ｍＶ以下、好ましくは６５０ｍＶ以下である。 The ORP of the cyanate and ammonia-containing waste water after adding hypobromite and / or hypobromite is 400 mV or more, preferably 500 mV or more. By setting the ORP to 400 mV or more, it becomes possible to maintain the oxidizing power in the aqueous system and decompose the hardly decomposable iron cyano complex. On the other hand, the upper limit of ORP is 800 mV or less, preferably 650 mV or less from the viewpoint of drug cost.
本発明では、このようなシアン及びアンモニア含有排水に次亜臭素酸及び／又は次亜臭素酸塩を含む薬液を添加してシアンを分解する。 In the present invention, a cyanide is decomposed by adding a chemical solution containing hypobromite and / or hypobromite to such cyanine and ammonia-containing wastewater.
本発明の一態様では、薬液は酸化剤成分として、実質的に次亜臭素酸及び／又は次亜臭素酸塩のみを含む。本発明の別の一態様では、薬液は、酸化剤成分として、次亜臭素酸及び／又は次亜臭素酸塩と、次亜塩素酸及び／又は次亜塩素酸塩とを含む。 In one embodiment of the present invention, the chemical liquid substantially contains only hypobromite and / or hypobromite as the oxidant component. In another one aspect | mode of this invention, a chemical | medical solution contains hypochlorous acid and / or hypobromite, and hypochlorous acid and / or hypochlorite as an oxidizing agent component.
上記の塩としては、ナトリウム塩又はカリウム塩が挙げられるが、特にナトリウム塩が好ましい。 Examples of the salt include sodium salt and potassium salt, and sodium salt is particularly preferable.
次亜臭素酸又は次亜臭素酸塩は、次亜塩素酸又はその塩（好ましくは次亜塩素酸ナトリウム）と臭素及び／又は臭化物好ましくは臭化ナトリウムとを反応させて生成させることが好ましい。次亜塩素酸と臭化ナトリウムとは次式に従って等モルで反応して次亜臭素酸が生成する。 Hypobromite or hypobromite is preferably produced by reacting hypochlorous acid or a salt thereof (preferably sodium hypochlorite) with bromine and / or bromide, preferably sodium bromide. Hypochlorous acid and sodium bromide react in equimolar amounts according to the following formula to form hypobromous acid.
ＨＯＣｌ＋ＮａＢｒ→ＨＯＢｒ＋ ＮａＣｌ
次亜塩素酸ナトリウムと臭化ナトリウムとは次式に従って等モルで反応して次亜臭素酸ナトリウムが生成する。
HOCl + NaBr → HOBr + NaCl
Sodium hypochlorite and sodium bromide react in equimolar amounts according to the following formula to form sodium hypobromite.
ＮａＯＣｌ＋ＮａＢｒ→ＮａＯＢｒ＋ＮａＣｌ
なお、臭素及び／又は臭化物と反応させる次亜塩素酸は、塩素を水に溶解させて次亜塩素酸を生成させた塩素溶解水であってもよい。
NaOCl + NaBr → NaOBr + NaCl
The hypochlorous acid to be reacted with bromine and / or bromide may be chlorine-dissolved water in which chlorine is dissolved in water to produce hypochlorous acid.
シアン及びアンモニア含有排水に対する次亜臭素酸及び／又は次亜臭素酸塩あるいはさらに次亜塩素酸及び／又は次亜塩素酸塩を含有する液（薬液）の添加量は、水系のＯＲＰ値を測定しながら決定することができる。具体的には前述のとおり、ＯＲＰ値が４００ｍＶ以上、好ましくは５００ｍＶ以上に到達するまで添加する。 The amount of hypobromite and / or hypobromite or a solution containing hypochlorous acid and / or hypochlorite (chemical solution) added to the wastewater containing cyanide and ammonia is measured by the ORP value of the aqueous system. While you can decide. Specifically, as described above, it is added until the ORP value reaches 400 mV or more, preferably 500 mV or more.
シアン及びアンモニア含有排水に対して次亜臭素酸及び／又は次亜臭素酸塩と次亜塩素酸及び／又は次亜塩素酸塩とを添加する場合、次亜臭素酸及び／又は次亜臭素酸塩の添加モル量は、次亜塩素酸及び／又は次亜塩素酸塩の添加モル量の０．１〜１．０倍特に０．３〜０．５倍とするのが好ましい。 When adding hypobromite and / or hypobromite and hypochlorous acid and / or hypochlorite to wastewater containing cyanide and ammonia, hypobromite and / or hypobromite The added molar amount of the salt is preferably 0.1 to 1.0 times, more preferably 0.3 to 0.5 times the added molar amount of hypochlorous acid and / or hypochlorite.
シアン及びアンモニア含有排水の処理は、槽内でバッチ式に行ってもよく、シアン及びアンモニア含有排水を反応槽に連続的に流入させ、かつ該反応槽から連続的に流出させ、該反応槽にてシアン分解反応を行ってもよく、シアン及びアンモニア含有排水を配管に流し、この配管に薬液を添加してライン処理してもよい。 The treatment of cyanide and ammonia containing waste water may be carried out batchwise in the tank, and the cyan and ammonia containing waste water is continuously flowed into and out of the reaction tank. Cyan decomposition reaction may be performed, and cyan and ammonia-containing waste water may be flowed through a pipe, and chemical treatment may be added to the pipe for line treatment.
本発明では、シアン及びアンモニア含有排水の水温を４０℃以上例えば４０〜８０℃特に５０〜７０℃程度とし、これによりシアン分解反応速度を大きくしてもよい。加熱コストを抑制するために、水温は８０℃以下、特に７０℃以下とすることが好ましい。 In the present invention, the water temperature of the cyanide and ammonia-containing waste water may be 40 ° C. or higher, for example, 40 to 80 ° C., particularly about 50 to 70 ° C., thereby increasing the cyan decomposition reaction rate. In order to suppress the heating cost, the water temperature is preferably 80 ° C. or lower, particularly 70 ° C. or lower.
以下実施例及び比較例について説明する。なお、以下の実施例及び比較例では溶解性鉄濃度、アンモニウムイオン濃度及び全シアン分析は、ＪＩＳ Ｋ ０１０２により測定した。全残留塩素及び遊離残留塩素は、ＤＰＤ試薬を用いてハック社製残留塩素計により測定した。 Examples and comparative examples will be described below. In the following Examples and Comparative Examples, soluble iron concentration, ammonium ion concentration, and total cyanide analysis were measured according to JIS K 0102. Total residual chlorine and free residual chlorine were measured with a Hack residual chlorine meter using a DPD reagent.
［実施例１（次亜臭素酸ナトリウム含有液による処理）］
試験水として次の水質の製鉄所排水を用いた。
[Example 1 (treatment with sodium hypobromite-containing solution)]
The following water quality steelworks effluent was used as test water.
ｐＨ：８．３、
全シアン濃度：０．８ｍｇ／Ｌ、
アンモニウムイオン濃度：５３２ｍｇ／Ｌ、
ＴＯＣ：２２ｍｇ／Ｌ、
溶解性鉄：１．３ｍｇ／Ｌ
ＯＲＰ：９０ｍＶ
pH: 8.3
Total cyan density: 0.8 mg / L,
Ammonium ion concentration: 532 mg / L,
TOC: 22 mg / L,
Soluble iron: 1.3 mg / L
ORP: 90mV
薬液としての次亜臭素酸ナトリウム含有液としては、４０ｗｔ％濃度の臭化ナトリウム溶液と１２ｗｔ％濃度の次亜塩素酸ナトリウム溶液とをＮａＢｒ：ＮａＯＣｌ＝１：１（モル比）となるように混合して次亜臭素酸ナトリウムを生成させた次亜臭素酸ナトリウム及び次亜塩素酸ナトリウム水溶液を用いた。 As a solution containing sodium hypobromite as a chemical solution, a 40 wt% sodium bromide solution and a 12 wt% sodium hypochlorite solution were mixed so that NaBr: NaOCl = 1: 1 (molar ratio). Thus, sodium hypobromite and sodium hypochlorite aqueous solution that produced sodium hypobromite were used.
試験水１０００ｍＬをガラス製容器に収容し、水温を５０℃に保ち、ＮａＯＨによりｐＨを１２とした後、上記の薬液（次亜臭素酸ナトリウム及び次亜塩素酸ナトリウム水溶液）を表１の条件にて添加した。シアン分解反応の反応時間は１時間とした。 1000 mL of test water is stored in a glass container, the water temperature is kept at 50 ° C., and the pH is adjusted to 12 with NaOH. Then, the above chemical solutions (sodium hypobromite and sodium hypochlorite aqueous solution) are subjected to the conditions shown in Table 1. Added. The reaction time of the cyanide decomposition reaction was 1 hour.
薬剤添加量（ただし試験水へのＮａＢｒ添加率、ＮａＯＣｌ添加率に換算）と、上記反応時間経過後の遊離残留塩素濃度、ＯＲＰ、全シアン濃度、全シアン分解率、アンモニウムイオン濃度及びアンモニウムイオン分解率を表１に示す。 Amount of chemical added (however, converted to NaBr addition rate and NaOCl addition rate in test water), free residual chlorine concentration after the above reaction time, ORP, total cyan concentration, total cyan decomposition rate, ammonium ion concentration and ammonium ion decomposition The rates are shown in Table 1.
［実施例２］
試験水として次の水質の製鉄所排水を用いた。
[Example 2]
The following water quality steelworks effluent was used as test water.
ｐＨ：８．１５、
全シアン濃度：０．７ｍｇ／Ｌ、
アンモニウムイオン濃度：３５４ｍｇ／Ｌ、
ＴＯＣ：１７ｍｇ／Ｌ、
溶解性鉄：１．４ｍｇ／Ｌ
ＯＲＰ：２３０ｍＶ
pH: 8.15
Total cyan density: 0.7 mg / L,
Ammonium ion concentration: 354 mg / L,
TOC: 17 mg / L,
Soluble iron: 1.4mg / L
ORP: 230 mV
薬液としての次亜臭素酸ナトリウム含有液としては、実施例１と同一の液を用いた。そして、ＮａＯＨによりｐＨを９としたこと以外は実施例１と同様にして処理を行った。薬剤添加量と、前記反応時間経過後の遊離残留塩素濃度、ＯＲＰ、全シアン濃度、全シアン分解率、アンモニウムイオン濃度及びアンモニウムイオン分解率を表１に示す。 The same solution as in Example 1 was used as the sodium hypobromite-containing solution as the chemical solution. And it processed like Example 1 except having set pH to 9 with NaOH. Table 1 shows the amount of the drug added and the free residual chlorine concentration, ORP, total cyan concentration, total cyan decomposition rate, ammonium ion concentration and ammonium ion decomposition rate after the reaction time.
［実施例３］
試験水として次の水質の製鉄所排水を用いた。
[Example 3]
The following water quality steelworks effluent was used as test water.
ｐＨ：８．６、
全シアン濃度：１．２ｍｇ／Ｌ、
アンモニウムイオン濃度：４１０ｍｇ／Ｌ、
ＴＯＣ：１８ｍｇ／Ｌ、
溶解性鉄：１．０ｍｇ／Ｌ
ＯＲＰ：２６４ｍＶ
pH: 8.6
Total cyan density: 1.2 mg / L,
Ammonium ion concentration: 410 mg / L,
TOC: 18 mg / L,
Soluble iron: 1.0 mg / L
ORP: 264 mV
ｐＨ９．６となるようにＮａＯＨを添加したこと以外は実施例２と同様にして試験水を処理した。結果を表１に示す。 The test water was treated in the same manner as in Example 2 except that NaOH was added so that the pH was 9.6. The results are shown in Table 1.
［比較例１（次亜塩素酸ナトリウムによる処理）］
試験水として次の水質の製鉄所排水を用いた。
[Comparative Example 1 (treatment with sodium hypochlorite)]
The following water quality steelworks effluent was used as test water.
ｐＨ：８．７、
全シアン濃度：０．７ｍｇ／Ｌ、
アンモニウムイオン濃度：４５１ｍｇ／Ｌ、
ＴＯＣ：１３ｍｇ／Ｌ、
溶解性鉄：１．３ｍｇ／Ｌ
ＯＲＰ：２３０ｍＶ
pH: 8.7
Total cyan density: 0.7 mg / L,
Ammonium ion concentration: 451 mg / L,
TOC: 13 mg / L,
Soluble iron: 1.3 mg / L
ORP: 230 mV
次亜臭素酸ナトリウム含有液の代わりに次亜塩素酸ナトリウム（１２ｗｔ％水溶液）を用い、ｐＨ１１．１となるようにＮａＯＨを添加し、ＮａＯＣｌとして表１に示す添加量にて添加したこと以外は実施例１と同様にして試験水を処理した。結果を表１に示す。 Instead of using sodium hypobromite-containing solution, sodium hypochlorite (12 wt% aqueous solution) was used, NaOH was added so that the pH was 11.1, and NaOCl was added in the addition amount shown in Table 1. Test water was treated in the same manner as in Example 1. The results are shown in Table 1.
［比較例２（次亜塩素酸ナトリウムによる処理）］
試験水として次の水質の製鉄所排水を用いた。
[Comparative Example 2 (treatment with sodium hypochlorite)]
The following water quality steelworks effluent was used as test water.
ｐＨ：８．７、
全シアン濃度：３．０ｍｇ／Ｌ、
アンモニウムイオン濃度：１２０ｍｇ／Ｌ、
ＴＯＣ：１０ｍｇ／Ｌ、
溶解性鉄：０．１ｍｇ／Ｌ
ＯＲＰ：２１０ｍＶ
pH: 8.7
Total cyan density: 3.0 mg / L,
Ammonium ion concentration: 120 mg / L,
TOC: 10 mg / L,
Soluble iron: 0.1 mg / L
ORP: 210 mV
次亜臭素酸ナトリウムの代わりに次亜塩素酸ナトリウム（１２ｗｔ％水溶液）を用い、ｐＨ１１．３となるようにＮａＯＨを添加し、ＮａＯＣｌとして表１に示す添加量にて添加したこと以外は実施例１と同様にして試験水を処理した。結果を表１に示す。 Example except that sodium hypochlorite (12 wt% aqueous solution) was used in place of sodium hypobromite, NaOH was added to pH 11.3, and NaOCl was added in the addition amount shown in Table 1. Test water was treated as in 1. The results are shown in Table 1.
表１の通り、次亜臭素酸ナトリウム含有液を用いた実施例１〜３によると、次亜塩素酸ナトリウムのみを用いた比較例１，２に比べてシアンが十分に分解される。なお、溶解性鉄濃度が高く、次亜塩素酸ナトリウムのみを用いた比較例１では、処理の結果、全シアン濃度が試験水よりも増加した。本発明では、溶解性鉄濃度が高くても、またｐＨ１１未満の条件でもシアンが十分に分解される。 As shown in Table 1, according to Examples 1 to 3 using a sodium hypobromite-containing liquid, cyan is sufficiently decomposed as compared with Comparative Examples 1 and 2 using only sodium hypochlorite. In Comparative Example 1 in which the soluble iron concentration was high and only sodium hypochlorite was used, the total cyan concentration increased from the test water as a result of the treatment. In the present invention, cyan is sufficiently decomposed even if the soluble iron concentration is high and the pH is less than 11.
［実施例４（次亜臭素酸ナトリウム含有液による処理）］
試験水として次の水質の製鉄所排水を用いた。
[Example 4 (treatment with sodium hypobromite-containing solution)]
The following water quality steelworks effluent was used as test water.
ｐＨ：８．２
アンモニウムイオン濃度：４１０ｍｇ／Ｌ
ＴＯＣ：２１ｍｇ／Ｌ
溶解性鉄：０．８ｍｇ／Ｌ
ＯＲＰ：１８７ｍＶ
pH: 8.2
Ammonium ion concentration: 410 mg / L
TOC: 21 mg / L
Soluble iron: 0.8mg / L
ORP: 187 mV
薬液（次亜臭素酸ナトリウム及び次亜塩素酸ナトリウム含有液）としては、４０ｗｔ％濃度の臭化ナトリウム溶液と１２ｗｔ％濃度の次亜塩素酸ナトリウム水溶液とをＮａＢｒ：ＮａＯＣｌ＝１：１（モル比）となるように混合して次亜臭素酸ナトリウムを生成させた液を用いた。 As a chemical solution (a solution containing sodium hypobromite and sodium hypochlorite), a 40 wt% sodium bromide solution and a 12 wt% sodium hypochlorite aqueous solution were mixed with NaBr: NaOCl = 1: 1 (molar ratio). ) Was used to produce sodium hypobromite.
試験水１０００ｍＬをガラス製容器に収容し、水温を５０℃に保ち、ＮａＯＨによりｐＨ９．６とした後、上記薬液を添加した。反応時間は５ｍｉｎとした。 1000 mL of test water was accommodated in a glass container, the water temperature was kept at 50 ° C., and the pH was adjusted to 9.6 with NaOH, and then the above chemical solution was added. The reaction time was 5 min.
薬剤添加量（ただし試験水へのＮａＢｒ添加率、ＮａＯＣｌ添加率に換算）と、上記反応時間経過後の残留塩素濃度を表２に示す。 Table 2 shows the amount of chemical added (however, converted to NaBr addition rate and NaOCl addition rate in the test water) and the residual chlorine concentration after the reaction time.
［比較例３（次亜塩素酸ナトリウムによる処理）］
薬液として次亜塩素酸ナトリウム（１２ｗｔ％水溶液）のみを表２に示す添加量にて添加したこと以外は実施例４と同様にして同一の試験水を処理した。結果を表２に示す。
[Comparative Example 3 (treatment with sodium hypochlorite)]
The same test water was treated in the same manner as in Example 4 except that only sodium hypochlorite (12 wt% aqueous solution) was added as a chemical solution in the addition amount shown in Table 2. The results are shown in Table 2.
［実施例５〜９（次亜臭素酸ナトリウム含有液による処理）］
試験水として次の水質の製鉄所排水を用いた。
[Examples 5 to 9 (treatment with sodium hypobromite-containing solution)]
The following water quality steelworks effluent was used as test water.
ｐＨ：８．３
アンモニウムイオン濃度：５３２ｍｇ／Ｌ
ＴＯＣ：２２ｍｇ／Ｌ
溶解性鉄：１．３ｍｇ／Ｌ
ＯＲＰ：９０ｍＶ
pH: 8.3
Ammonium ion concentration: 532 mg / L
TOC: 22mg / L
Soluble iron: 1.3 mg / L
ORP: 90mV
薬液（次亜臭素酸ナトリウム、又は次亜臭素酸ナトリウム及び次亜塩素酸ナトリウム含有液）としては、４０ｗｔ％濃度の臭化ナトリウム溶液と１２ｗｔ％濃度の次亜塩素酸ナトリウム水溶液とを表２の配合量にて混合して次亜臭素酸ナトリウムを生成させた液を用いた。 As a chemical solution (sodium hypobromite, or a solution containing sodium hypobromite and sodium hypochlorite), a 40 wt% sodium bromide solution and a 12 wt% sodium hypochlorite aqueous solution are shown in Table 2. A liquid in which sodium hypobromite was produced by mixing at a blending amount was used.
試験水１０００ｍＬをガラス製容器に収容し、水温を５０℃に保ち、ＮａＯＨによりｐＨ９．７（実施例５）又は９．６（実施例６〜９）とした後、次亜臭素酸ナトリウム水溶液を添加した。反応時間は５ｍｉｎとした。 1000 mL of test water is stored in a glass container, the water temperature is kept at 50 ° C., and the pH is adjusted to 9.7 (Example 5) or 9.6 (Examples 6 to 9) with NaOH, and then an aqueous sodium hypobromite solution is added. Added. The reaction time was 5 min.
薬剤添加量（ただし試験水へのＮａＢｒ添加率、ＮａＯＣｌ添加率に換算）と、上記反応時間経過後の残留塩素濃度を表２に示す。 Table 2 shows the amount of chemical added (however, converted to NaBr addition rate and NaOCl addition rate in the test water) and the residual chlorine concentration after the reaction time.
＜考察＞
表２の通り、次亜臭素酸ナトリウム及び次亜塩素酸ナトリウム含有液を添加した実施例４〜９によると、溶解性鉄濃度が高くても次亜塩素酸ナトリウムのみを添加した比較例３に比べて残留塩素が少ない。このため、本発明では、ハロゲンガスの発生が抑制されることが分かる。
<Discussion>
As shown in Table 2, according to Examples 4 to 9 in which sodium hypobromite and sodium hypochlorite-containing liquids were added, in Comparative Example 3 in which only sodium hypochlorite was added even though the soluble iron concentration was high Less residual chlorine. For this reason, in this invention, it turns out that generation | occurrence | production of halogen gas is suppressed.
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| CN113003800A (en) * | 2021-02-25 | 2021-06-22 | 上海金厦实业有限公司 | Wastewater quality-based treatment process |
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| JPS60129182A (en) * | 1983-12-17 | 1985-07-10 | Hakutou Kagaku Kk | Method for preventing biological fault of service and waste water system |
| JP2716126B2 (en) * | 1987-07-10 | 1998-02-18 | 日本シリカ工業株式会社 | Slime control method |
| JPH07328663A (en) * | 1994-06-01 | 1995-12-19 | Japan Organo Co Ltd | Device for treating ammoniacal nitrogen-containing waste water |
| JPH08155463A (en) * | 1994-12-02 | 1996-06-18 | Permelec Electrode Ltd | Method and apparatus for decomposing ammoniacal nitrogen nitric-nitrogen and/or nitrous-nitrogen |
| OA12452A (en) * | 2001-03-02 | 2006-05-23 | Net Rac Invest No 60 Proprieta | Stabilised hypobromous acid solutions. |
| WO2002094719A1 (en) * | 2001-05-21 | 2002-11-28 | Mitsubishi Denki Kabushiki Kaisha | Process and apparatus for treating nitrogen compound containing water |
| US6994793B2 (en) * | 2002-04-19 | 2006-02-07 | Hydro-Trace Incorporated | Process for remediating ground water containing one or more nitrogen compounds |
| JP2005296863A (en) * | 2004-04-14 | 2005-10-27 | Ebara Kogyo Senjo Kk | Method for treating waste liquid containing thiourea and apparatus |
| JP4656379B2 (en) * | 2004-07-14 | 2011-03-23 | 栗田工業株式会社 | Method of treating wastewater containing iron cyanide |
| JP2006334508A (en) * | 2005-06-02 | 2006-12-14 | Nippon Parkerizing Co Ltd | Method and apparatus for simultaneously and continuously treating cyanide/ammonia-containing liquid waste continuously |
| JP5617862B2 (en) * | 2012-03-30 | 2014-11-05 | 栗田工業株式会社 | Cyanide wastewater treatment method |
| WO2013147128A1 (en) * | 2012-03-30 | 2013-10-03 | 栗田工業株式会社 | Method for treating cyanogen-containing waste water |
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