JP2012076058A - 難分解性物質を含む排水の処理方法 - Google Patents
難分解性物質を含む排水の処理方法 Download PDFInfo
- Publication number
- JP2012076058A JP2012076058A JP2010226082A JP2010226082A JP2012076058A JP 2012076058 A JP2012076058 A JP 2012076058A JP 2010226082 A JP2010226082 A JP 2010226082A JP 2010226082 A JP2010226082 A JP 2010226082A JP 2012076058 A JP2012076058 A JP 2012076058A
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- JP
- Japan
- Prior art keywords
- wastewater
- treatment
- waste water
- decomposition
- 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.)
- Granted
Links
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- 238000000034 method Methods 0.000 title claims abstract description 83
- 239000000126 substance Substances 0.000 title abstract description 39
- 230000002085 persistent effect Effects 0.000 title abstract description 4
- 238000011282 treatment Methods 0.000 claims abstract description 137
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 55
- 230000003647 oxidation Effects 0.000 claims abstract description 54
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 40
- 239000011575 calcium Substances 0.000 claims abstract description 21
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- 229910052791 calcium Inorganic materials 0.000 claims abstract description 15
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- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 20
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- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 7
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
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- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Activated Sludge Processes (AREA)
- Physical Water Treatments (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
【解決手段】 化石燃料を部分酸化して得られるガスを湿式洗浄した際に排出される排水の処理方法であって、排水を酸性側に調整して曝気することによって排水に含まれる遊離シアンを除去する遊離シアン除去工程2と、遊離シアン除去工程2で処理された排水を生物処理する生物処理工程3と、生物処理工程3で処理された排水に含まれるCOD成分を分解する分解処理工程4とからなる。分解処理工程4は、促進酸化処理する手段によって構成されていることが好ましく、排水にカルシウム系アルカリ剤を添加して硫酸カルシウムを晶析する工程を含んでもよい。
【選択図】 図1
Description
S2O8 2−+2e−→2SO4 2−
純水に各試薬を溶解させて、シアン化ナトリウムが50mg/L(CNとして)、フェロシアン化カリウムが5mg/L(CNとして)、ギ酸ナトリウムが500mg/L(ギ酸として)、チオ硫酸ナトリウムが100mg/L(S2O3として)に調製された模擬排水を作製した。この模擬排水を、希薄塩酸を用いてpH4.5にし、温度を40℃に調整したのち、模擬排水1Lに対して1分間に0.1L相当の空気を約30分間曝気した。排出空気は濃度1mol/LのNaOH水溶液にバブリングして実験用ドラフト内に放出した。このように空気曝気処理して得た曝気排水中の全シアン濃度(JIS K−0102による)は8mg/Lとなり、排出空気を処理したNaOH水溶液中にはシアン化物が検出された。
フッ化ナトリウムを200mg/L(Fとして)、チオシアン酸ナトリウムを50mg/L(SCNとして)さらに含む以外は実施例1と同様の模擬排水を調製した。この模擬排水に対して、実施例1と同様の条件で空気曝気処理を行い、得られた曝気排水にCa(OH)2を添加してpH8に調整すると共に、硫酸第一鉄を120mg/L(Feとして)となるように添加した後、空気を導入しながら15分間攪拌混合して、CaF2固体などを含むスラリー状の液体を得た。
2 遊離シアン除去工程
3 生物処理工程
4 分解処理工程
5 残留シアノ錯体除去工程
6 セレン・フッ素除去工程
7 逆浸透膜処理工程
Claims (10)
- 化石燃料を部分酸化して得られるガスを湿式洗浄した際に排出される排水の処理方法であって、排水を酸性側に調整して曝気することによって排水に含まれる遊離シアンを除去する遊離シアン除去工程と、遊離シアン除去工程で処理された排水を生物処理する生物処理工程と、生物処理工程で処理された排水に含まれるCOD成分を分解する分解処理工程とからなることを特徴とする排水の処理方法。
- 前記分解処理工程が促進酸化処理する手段によって構成されていることを特徴とする、請求項1に記載の排水の処理方法。
- 前記分解処理工程が、過硫酸及び/又は過硫酸塩を用いた促進酸化工程と、排水にカルシウム系アルカリ剤を添加して硫酸カルシウムを晶析する中和晶析工程とからなることを特徴とする、請求項1に記載の排水の処理方法。
- 前記促進酸化工程と前記中和晶析工程とが同一の反応槽内で並行して行われることを特徴とする、請求項3に記載の排水の処理方法。
- 前記遊離シアン除去工程と前記生物処理工程との間に、排水に水酸化カルシウム、炭酸カルシウム及び塩化カルシウムの内の少なくとも1種類を添加してフッ素をフッ化カルシウムに固定化する工程、及び排水に2価及び/又は3価の鉄イオンを添加してチオシアン類を錯体化する工程のうちの少なくとも一方が含まれていることを特徴とする、請求項1〜4のいずれかに記載の排水の処理方法。
- 前記遊離シアン除去工程で除去された遊離シアンをアルカリ液で回収した後、前記分解処理工程で処理することを特徴とする、請求項1〜5のいずれかに記載の排水の処理方法。
- 排水に含まれるアンモニアを除去する工程をさらに含んでいることを特徴とする、請求項1〜6のいずれかに記載の排水の処理方法。
- 前記分解処理工程で処理された排水の少なくとも一部を逆浸透膜で処理し、得られた濃縮液を前記生物処理工程の上流にリサイクルすることを特徴とする、請求項1〜7のいずれかに記載の排水の処理方法。
- 前記分解処理工程と前記逆浸透膜での処理の間に、シアノ錯体を分解する工程、セレンを除去する工程、及び難処理性のフッ素化合物を除去する工程のうちの少なくとも1つが含まれていることを特徴とする、請求項8に記載の排水の処理方法。
- 前記セレンを除去する工程及び前記難処理性のフッ素化合物を除去する工程が、排水に塩化アルミニウム又は硫酸アルミニウムを添加した後、酸化条件下で鉄材に接触させ、生成した固体を固液分離するものであることを特徴とする、請求項9に記載の排水の処理方法。
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