JP5879901B2 - 有機排水の回収処理装置及び回収処理方法 - Google Patents
有機排水の回収処理装置及び回収処理方法 Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims description 69
- 238000011084 recovery Methods 0.000 title claims description 52
- 238000003672 processing method Methods 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 101
- 238000000926 separation method Methods 0.000 claims description 72
- 239000012528 membrane Substances 0.000 claims description 67
- 238000001914 filtration Methods 0.000 claims description 49
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 42
- 238000001223 reverse osmosis Methods 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 33
- 238000005374 membrane filtration Methods 0.000 claims description 32
- 239000000126 substance Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 25
- 238000000108 ultra-filtration Methods 0.000 claims description 23
- 238000005345 coagulation Methods 0.000 claims description 21
- 230000015271 coagulation Effects 0.000 claims description 21
- 238000001471 micro-filtration Methods 0.000 claims description 17
- 238000004140 cleaning Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 10
- 238000005188 flotation Methods 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000005189 flocculation Methods 0.000 claims description 2
- 230000001112 coagulating effect Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 description 24
- 230000007423 decrease Effects 0.000 description 13
- 239000005416 organic matter Substances 0.000 description 12
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- 239000008394 flocculating agent Substances 0.000 description 3
- 239000010815 organic waste Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000004931 aggregating effect Effects 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
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- 230000000052 comparative effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 101000878595 Arabidopsis thaliana Squalene synthase 1 Proteins 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B01D2321/16—Use of chemical agents
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- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- 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
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Description
即ち、UF膜濾過装置又はMF膜濾過装置では、運転を継続すると、膜フラックスの低下が激しくなり、運転開始から数ヶ月で、薬品洗浄を行っても、薬品洗浄直後のフラックスは回復してもその後1日〜数日でフラックスが再び低下するようになり、最終的には薬品洗浄を行っても安定運転を維持し得る程度にフラックスを回復することはできなくなる。
(1) 濾過装置がUF膜濾過装置又はMF膜濾過装置の場合、膜フラックスを高く維持することができ、薬品洗浄頻度を低減することができる。
(2) (1)の薬品洗浄頻度の低減で装置の稼動効率の向上、薬品洗浄コストの低減を図ることができる。
(3) 濾過装置がUF膜濾過装置又はMF膜濾過装置である場合の当該膜濾過装置や、濾過装置が濾過器である場合の後段のRO膜分離装置において、膜の目詰まりが防止されるため、運転圧力(通水圧力)を低くすることができ、動力費(電気代)を大幅に低減することができる。
(4) 回収処理系内の水のコロイド性有機物濃度が低減することで、回収水(RO膜分離装置の透過水)の水質の向上、特にTOC濃度の大幅な低減が可能となり、回収水の用途を大幅に拡大することができる。
(1) 凝集処理槽と沈殿槽
(2) 凝集処理槽と加圧浮上分離槽
(3) 凝集沈殿槽
(4) 凝集加圧浮上分離槽
などを採用することができる。
食品系有機排水(TOC:100mg/L)を原水として、図1に示す装置で水回収(原水量:15m3/hr,回収水量:10m3/hr)を行った。
濾過装置2:栗田工業(株)製UF膜濾過装置「PF−15G」(操作圧力:0.1MPa)
活性炭塔3:固定床型 通水SV=20hr−1
RO膜分離装置4:栗田工業(株)製超低圧RO膜分離装置「KROA−2032」(水回収率:66%)
凝集・固液分離装置5:無機凝集剤としてPACを300mg/L添加する凝集処理槽と、凝集処理水が導入される加圧浮上槽
実施例1において、凝集・固液分離装置5を設けず、UF膜濾過装置2及び活性炭塔3の逆洗排水とRO膜分離装置4の濃縮水をそのまま生物処理装置1に送給したこと以外は同様にして処理を行ったところ、運転開始から約1ヶ月後のUF膜濾過装置2の膜フラックスは1m/dayでほぼ安定していたが、長期的には低下傾向にあることが認められた。また、得られた回収水(RO膜分離装置4の透過水)のTOC濃度は1.0〜3.0mg/Lで、実施例1よりも劣るものであった。
2 濾過装置
3 活性炭塔
4 RO膜分離装置
5 凝集・固液分離装置
Claims (8)
- 有機排水を生物処理する生物処理手段と、
該生物処理手段からの生物処理水の少なくとも一部が導入される濾過装置、及び該濾過装置の濾過水が導入される逆浸透膜分離装置とを含む回収処理手段と、
該濾過装置の逆洗排水及び/又は該濾過装置の薬品洗浄排水、或いは該濾過装置の逆洗排水及び/又は該濾過装置の薬品洗浄排水と該逆浸透膜分離装置の濃縮水を前記生物処理手段の原水導入側へ返送する返送手段とを有する有機排水の回収処理装置において、
該返送手段で前記生物処理手段の原水導入側へ返送される水の少なくとも一部を凝集処理した後固液分離する凝集処理手段と固液分離手段とを有し、該固液分離手段の処理水が前記生物処理手段に送給されることを特徴とする有機排水の回収処理装置。 - 請求項1において、前記濾過装置の濾過水が導入される活性炭塔を有し、該活性炭塔の処理水が前記逆浸透膜分離装置に導入されることを特徴とする有機排水の回収処理装置。
- 請求項1又は2において、前記濾過装置が限外濾過膜濾過装置又は精密濾過膜濾過装置であることを特徴とする有機排水の回収処理装置。
- 請求項1ないし3のいずれか1項において、前記固液分離手段が、加圧浮上分離装置又は沈殿処理装置であることを特徴とする有機排水の回収処理装置。
- 有機排水を生物処理する生物処理工程と、
該生物処理工程からの生物処理水の少なくとも一部を濾過装置で濾過した後、逆浸透膜分離装置で脱塩処理する回収処理工程と、
該濾過装置の逆洗排水及び/又は該濾過装置の薬品洗浄排水、或いは該濾過装置の逆洗排水及び/又は該濾過装置の薬品洗浄排水と該逆浸透膜分離装置の濃縮水を前記生物処理工程に返送して生物処理する返送工程とを有する有機排水の回収処理方法において、
該返送工程において、前記生物処理工程に返送される水の少なくとも一部を凝集処理した後固液分離し、得られた処理水を前記生物処理工程に返送することを特徴とする有機排水の回収処理方法。 - 請求項5において、前記濾過装置の濾過水を活性炭塔で処理した後、前記逆浸透膜分離装置で脱塩処理することを特徴とする有機排水の回収処理方法。
- 請求項5又は6において、前記濾過装置が限外濾過膜濾過装置又は精密濾過膜濾過装置であることを特徴とする有機排水の回収処理方法。
- 請求項5ないし7のいずれか1項において、前記固液分離が、加圧浮上分離又は沈殿処理であることを特徴とする有機排水の回収処理方法。
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JP2011225993A JP5879901B2 (ja) | 2011-10-13 | 2011-10-13 | 有機排水の回収処理装置及び回収処理方法 |
CN201280043871.0A CN103796957B (zh) | 2011-10-13 | 2012-10-10 | 有机排水的回收处理装置和回收处理方法 |
KR1020147006643A KR101985037B1 (ko) | 2011-10-13 | 2012-10-10 | 유기 배수의 회수 처리 장치 및 회수 처리 방법 |
PCT/JP2012/076192 WO2013054810A1 (ja) | 2011-10-13 | 2012-10-10 | 有機排水の回収処理装置及び回収処理方法 |
TW101137719A TWI545087B (zh) | 2011-10-13 | 2012-10-12 | Wastewater treatment unit for organic waste water and recycling method |
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