JP2022055836A - Metal salt flocculant - Google Patents
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 53
- 239000002184 metal Substances 0.000 title claims abstract description 53
- 150000003839 salts Chemical class 0.000 title claims abstract description 53
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- -1 iron ion Chemical class 0.000 claims abstract description 40
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 25
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- 239000000460 chlorine Substances 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000002781 deodorant agent Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 239000012024 dehydrating agents Substances 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 35
- 238000003860 storage Methods 0.000 abstract description 9
- 238000002156 mixing Methods 0.000 abstract description 8
- 238000005189 flocculation Methods 0.000 abstract description 4
- 230000016615 flocculation Effects 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000010802 sludge Substances 0.000 description 19
- 239000003814 drug Substances 0.000 description 15
- 229940079593 drug Drugs 0.000 description 15
- 239000000126 substance Substances 0.000 description 13
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 12
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 12
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 10
- 239000008394 flocculating agent Substances 0.000 description 10
- 239000010865 sewage Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 9
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 8
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 7
- 238000004062 sedimentation Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 239000006228 supernatant Substances 0.000 description 6
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 238000004220 aggregation Methods 0.000 description 4
- 150000001768 cations Chemical class 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001877 deodorizing effect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000001879 gelation Methods 0.000 description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000004931 aggregating effect Effects 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004912 1,5-cyclooctadiene Substances 0.000 description 1
- 102100036439 Amyloid beta precursor protein binding family B member 1 Human genes 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 101000928670 Homo sapiens Amyloid beta precursor protein binding family B member 1 Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 235000014413 iron hydroxide Nutrition 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
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
特許法第３０条第２項適用申請有り 令和２年７月２７日 第５７回下水道研究発表会講演予稿集 ４０～４２ページにおいて、文書をもって発表。Application for application of Article 30, Paragraph 2 of the Patent Act July 27, 2 Reiwa Announced in writing on pages 40-42 of the proceedings of the 57th Sewerage Research Presentation.
本発明は、排水処理に使用される鉄イオンとアルミニウムイオンを含む金属塩凝集剤や各種薬剤に関する。 The present invention relates to a metal salt flocculant containing iron ions and aluminum ions and various chemicals used for wastewater treatment.
下水処理場やし尿処理場においては、放流水の水質改善、廃棄物量の削減、施設の円滑な運転や長寿命化を目的として、鉄系やアルミニウム系の金属塩凝集剤を被処理水等に対して投入して使用される。鉄系の凝集剤としては、塩化第二鉄、ポリ硫酸第二鉄、硫酸第一鉄溶液が代表的な凝集剤であり、アルミニウム系としては、硫酸バンド、塩化アルミニウム、ポリ塩化アルミニウムが挙げられる。 At sewage treatment plants and sewage treatment plants, iron-based and aluminum-based metal salt flocculants are used as treated water for the purpose of improving the quality of discharged water, reducing the amount of waste, smooth operation of facilities, and extending the service life. On the other hand, it is used by throwing it in. Typical iron-based flocculants include ferric chloride, polyferric sulfate, and ferrous sulfate solutions, and examples of aluminum-based coagulants include sulfate bands, aluminum chloride, and polyaluminum chloride. ..
ポリ硫酸第二鉄は、鉄系の無機凝集剤の代表例の一つで、脱臭および脱リン効果を有することから、下水処理場およびし尿処理において広く使用されている。ポリ硫酸第二鉄は、一般式（〔Ｆｅ２（ＯＨ）ｎ（ＳＯ４）３－ｎ／２ 〕ｍ 但し０＜ｎ≦２、ｍは自然数）で示され、鉄系原料である硫酸第一鉄（ＦｅＳＯ４）溶液に対して触媒として亜硝酸ナトリウム及び酸化剤を添加して、酸化反応を進行させる等の方法により得ることが出来る(特許文献１)。
ポリ塩化アルミニウム（通称ＰＡＣ）は、アルミニウム系の無機凝集剤の代表例の一つで、懸濁質や溶解性有機物の処理性が高く、最適ｐＨ範囲が広い、水温の影響を受けがたく、凝集剤添加濃度の節減が可能且つ処理後の水が着色しないことなどから、浄水処理場において広く使用されている。ＰＡＣは、ある一定の塩基度（＝ｍ／３ｎ×１００）を有する凝集剤で（特許文献２）、一般式 Ａｌｎ(ＯＨ)mＣｌ3n-m（３ｎ＞ｍ）で示され、塩酸または塩化アルミニウム溶液中に水酸化アルミニウムを加え、耐圧反応器内で加温・加圧させた方法によって得ることが出来る（特許文献３、４）。
Ferric polysulfate is one of the representative examples of iron-based inorganic flocculants, and is widely used in sewage treatment plants and urine treatment because it has deodorizing and dephosphorifying effects. Ferric polysulfate is represented by the general formula ([Fe 2 (OH) n (SO 4 ) 3-n / 2 ] m , where 0 <n ≦ 2, m is a natural number), and ferric sulfate is an iron-based raw material. It can be obtained by adding sodium nitrite and an oxidizing agent as catalysts to a ferric iron (FeSO 4 ) solution to promote the oxidation reaction (Patent Document 1).
Polyaluminum chloride (commonly known as PAC) is one of the representative examples of aluminum-based inorganic flocculants. It has high treatability of suspensions and soluble organic substances, has a wide optimum pH range, and is not easily affected by water temperature. It is widely used in water purification plants because it can reduce the concentration of coagulant added and the treated water does not color. PAC is a flocculant having a certain basicity (= m / 3n × 100) (Patent Document 2), and is represented by the general formula Al n (OH) m Cl 3n-m (3n> m), and is represented by hydrochloric acid or hydrochloric acid. It can be obtained by adding aluminum hydroxide to an aluminum chloride solution and heating and pressurizing it in a pressure resistant reactor (Patent Documents 3 and 4).
無機凝集剤は、一般的にその主たる無機成分の濃度が高いものが、凝集効果が高くなることから、薬剤使用量の削減をすることが可能となり、且つ輸送面でもメリットがある。
例えば、ポリ硫酸第二鉄についても通常品(全鉄濃度が１１．０～１２．５％)と比較して高濃度(全鉄濃度が１２．５％以上)として含有水分が少なくすることにより、高い凝集能力と脱水性を有し、製品輸送コストを低減することができる。
Generally, an inorganic flocculant having a high concentration of its main inorganic component has a high flocculation effect, so that it is possible to reduce the amount of the drug used and it is also advantageous in terms of transportation.
For example, ferric polysulfate also has a higher concentration (total iron concentration of 12.5% or more) and less water content than the normal product (total iron concentration of 11.0 to 12.5%). It has high aggregation capacity and dehydration, and can reduce the product transportation cost.
日本国内で製造・販売されている水処理凝集剤用途のポリ塩化アルミニウムは、Ａｌ２Ｏ３濃度として約１０％（重量パーセント）以上のスペックである（以下、通常品）。Ａｌ２Ｏ３濃度が１５％を超えるような高濃度製品は、溶液の安定性の問題より、日本国内では販売されていないが、Ａｌ２Ｏ３濃度が１０％を超えるポリ塩化アルミニウムの高濃度製品に関する発明は既に報告されている（特許文献５、６）。特許文献５では、Ａｌ２Ｏ３濃度が５～２５ｗｔ％である高塩基性塩化アルミニウム溶液の製造方法を開示し、特許文献６では、Ａｌ２Ｏ３濃度が１６～２５％である塩基性塩化アルミニウムを主体とする高濃度凝集剤を開示している。 Polyaluminum chloride for water treatment flocculants manufactured and sold in Japan has a specification of about 10% (weight percent) or more as an Al2O3 concentration (hereinafter referred to as a normal product). High-concentration products with an Al 2 O 3 concentration exceeding 15% are not sold in Japan due to the problem of solution stability, but a high concentration of polyaluminum chloride with an Al 2 O 3 concentration exceeding 10%. Inventions relating to products have already been reported (Patent Documents 5 and 6). Patent Document 5 discloses a method for producing a highly basic aluminum chloride solution having an Al 2 O 3 concentration of 5 to 25 wt%, and Patent Document 6 discloses basic chloride having an Al 2 O 3 concentration of 16 to 25%. It discloses a high-concentration flocculant mainly composed of aluminum.
近年では、鉄系凝集剤とアルミニウム系凝集剤がそれぞれ有する特徴を発揮させるため、両者を混合して、鉄イオンとアルミニウムイオンを含む金属塩凝集剤として使用することが試みられるようになっている（特許文献７、８）。
特許文献７では、Ａｌ／Ｆｅの重量比が１／３０～１／２である無機凝集剤を開示し、特許文献８では、Ａｌ／Ｆｅのモル比が０．０６～１．０である含鉄廃塩酸を利用した凝集剤を開示している。
In recent years, in order to bring out the characteristics of iron-based flocculants and aluminum-based flocculants, attempts have been made to mix them and use them as metal salt flocculants containing iron ions and aluminum ions. (Patent Documents 7 and 8).
Patent Document 7 discloses an inorganic flocculant having an Al / Fe weight ratio of 1/30 to 1/2, and Patent Document 8 discloses an iron-containing iron having an Al / Fe molar ratio of 0.06 to 1.0. A flocculant using waste hydrochloric acid is disclosed.
鉄イオンとアルミニウムイオンを含む金属塩凝集剤の使用例としては、還元性の排水に鉄系のポリ硫酸第二鉄を添加すると一部着色する場合があるので、これを防ぐために、塩化アルミニウムや硫酸バンドを配合した凝集剤を使用することが知られている。また、製紙工場等では、主として使用されるアルミニウム系の薬剤に対して、消臭効果を付帯させるために鉄系凝集剤を混合することがある。
しかしながら、その組み合わせによっては、問題が発生することも知られている。
例えば、塩化アルミニウムとポリ硫酸第二鉄の組合せでは、高い凝集効果は得られるものの、腐食性が強く且つ温度の低下によりミョウバンを析出するなどの保存安定性に問題があった。硫酸バンドとポリ硫酸第二鉄の組合せでは、腐食性が弱く、安定性にも優れているが、他の凝集剤に比べて薬剤の添加量が多くなり、経済性に難があった。
また、アルミニウム系で最も高い凝集力を有するポリ塩化アルミニウムに対し、鉄系の塩化第二鉄やポリ硫酸第二鉄を混合した、鉄イオンとアルミニウムイオンを含む金属塩凝集剤の調製がこれまでに試みられてきたが、短期間でゲル化するなど保存安定性が極度に悪く、市販化には至っていない。
更に、鉄イオンとアルミニウムイオンを含む金属塩凝集剤において、陽イオンの多くを鉄イオンが占め、アルミニウムイオンが鉄イオンに対して多量である組成をもった金属塩凝集剤(鉄含有ポリ塩化アルミニウム)の調製は、これまでには報告されていない。
As an example of the use of a metal salt flocculant containing iron ions and aluminum ions, when iron-based ferric sulfate is added to reducing wastewater, it may be partially colored. To prevent this, aluminum chloride or It is known to use a flocculant containing a sulfate band. Further, in paper mills and the like, an iron-based flocculant may be mixed with an aluminum-based chemical that is mainly used in order to add a deodorizing effect.
However, it is also known that some combinations cause problems.
For example, the combination of aluminum chloride and ferric polysulfate has a high coagulation effect, but is highly corrosive and has problems in storage stability such as precipitation of alum due to a decrease in temperature. The combination of the sulfate band and ferric polysulfate has weak corrosiveness and excellent stability, but the amount of the drug added is larger than that of other flocculants, which is economically difficult.
In addition, the preparation of a metal salt flocculant containing iron ions and aluminum ions, which is a mixture of iron-based ferric chloride and polyferric sulfate with polyaluminum chloride, which has the highest cohesive power among aluminum-based materials, has been prepared so far. However, it has not been put on the market due to its extremely poor storage stability such as gelation in a short period of time.
Further, in the metal salt flocculant containing iron ion and aluminum ion, the metal salt flocculant (iron-containing polyaluminum chloride) has a composition in which iron ion occupies most of the cations and the aluminum ion is abundant with respect to iron ion. ) Has not been reported so far.
本発明は、共に高い凝集能力を有することが知られているポリ硫酸第二鉄とポリ塩化アルミニウムについて、これらを混合して組み合わせることで、それぞれを単独で用いた場合に比較して、より高い凝集能力を有しながら保存安定性にも優れ、さらに様々な特徴を有する広範囲の処理排液に対して適用可能な鉄イオンとアルミニウムイオンを含む金属塩凝集剤を提供することを目的とする。 In the present invention, ferric sulfate and polyaluminum chloride, both of which are known to have high aggregation ability, are mixed and combined to be higher than when each of them is used alone. It is an object of the present invention to provide a metal salt aggregating agent containing iron ions and aluminum ions, which has an aggregating ability, is excellent in storage stability, and is applicable to a wide range of treated effluents having various characteristics.
これらの課題を解決するため、本発明の金属塩凝集剤は、次の技術的手段から構成されるものである。
［１］１リットル中にアルミニウムと鉄イオンの合計が５．７モル以下であり、モル比で塩素イオンと鉄イオンの比（Ｃｌ／Ｆｅ）が２８以上、硫酸イオンと酸化アルミニウム換算でアルミニウムイオンのモル比（ＳＯ４／Ａｌ２Ｏ３）が０．１５以下であることを特徴とする金属塩凝集剤。
［２］ｐＨが３．７～４．２（１００倍希釈溶液）、比重が１．３５～１．４５であることを特徴とする［１］の金属塩凝集剤。
［３］［１］または［２］の金属塩凝集剤を含有する凝集剤。
［４］［１］または［２］の金属塩凝集剤を含有する水質改善剤。
［５］［１］または［２］の金属塩凝集剤を含有する消臭剤。
［６］［１］または［２］の金属塩凝集剤を含有する脱水剤。
［７］［１］または［２］の金属塩凝集剤を含有する排水の色度低下剤。
In order to solve these problems, the metal salt flocculant of the present invention comprises the following technical means.
[1] The total amount of aluminum and iron ions in 1 liter is 5.7 mol or less, the ratio of chlorine ions to iron ions (Cl / Fe) is 28 or more in terms of molar ratio, and aluminum ions in terms of sulfate ions and aluminum oxide. A metal salt flocculant having a molar ratio (SO 4 / Al 2 O 3 ) of 0.15 or less.
[2] The metal salt flocculant according to [1], which has a pH of 3.7 to 4.2 (100-fold diluted solution) and a specific gravity of 1.35 to 1.45.
[3] A flocculant containing the metal salt flocculant of [1] or [2].
[4] A water quality improving agent containing the metal salt flocculant of [1] or [2].
[5] A deodorant containing the metal salt flocculant of [1] or [2].
[6] A dehydrating agent containing the metal salt flocculant of [1] or [2].
[7] A chromaticity reducing agent for wastewater containing the metal salt flocculant according to [1] or [2].
本発明の金属塩凝集剤は、高い凝集能力を有することが知られているポリ硫酸第二鉄とポリ塩化アルミニウムを混合して組み合わせることで、高い凝集能力を有しながらも保存安定性に優れ、さらに様々な特徴を有する広範囲の処理排液に対して適用可能な、鉄イオンとアルミニウムイオンを含む金属塩凝集剤を提供することが可能となった。 The metal salt flocculant of the present invention has excellent storage stability while having high flocculation ability by mixing and combining ferric polysulfate, which is known to have high flocculation ability, and polyaluminum chloride. Further, it has become possible to provide a metal salt flocculant containing iron ion and aluminum ion, which can be applied to a wide range of treated effluents having various characteristics.
本発明者らは、ポリ塩化アルミニウムに対して、所定量のポリ硫酸第二鉄を添加・混合することで、保存安定性が高く、優れた水処理性能を有する鉄イオンとアルミニウムイオンを含む金属塩凝集剤が得られることを発見した。
一般的に、塩基度の高いポリ塩化アルミニウムに対して、塩基度の低いポリ硫酸第二鉄を配合すると、ポリ塩化アルミニウムはｐＨが下がることでゲル化反応が進行する。また、ポリ硫酸第二鉄における鉄イオンは、ｐＨが上昇することで水酸化鉄を生成して不溶化する。しかし、本発明の金属塩凝集剤を構成するイオンの量的関係を所定範囲に調整することで、ポリ塩化アルミニウムの安定化に必要な硫酸イオンが補給され、ゲル化が抑制される。また、ポリ硫酸第二鉄の鉄イオンにとっては、アルカリの供給が低下することで安定性の維持が可能となる。
一般的に水処理剤が溶液の状態で安定的に存在できるか否か（保存安定性）は、陽イオン濃度、陽イオンに対する陰イオンのモル比によって決まる例が多い。そこで、Ａｌ＋Ｆｅ[mol/L]、Ｃｌ／Ｆｅ（モル比）、ＳＯ４／Ａｌ２Ｏ３（モル比）を基準として、安定領域を定めた。なお、Ｃｌ／Ａｌ２Ｏ３とＳＯ４／Ｆｅは使用薬剤（ポリ塩化アルミニウムとポリ硫酸第二鉄）で固有の値をとり、両薬剤の混合比を変えてもこれらモル比は変わらないことになるので、ここでは考慮する必要はない。
これにより、ポリ塩化アルミニウムを主成分とし、これにポリ硫酸第二鉄を添加・混合した鉄イオンとアルミニウムイオンを含む金属塩凝集剤を得ることができた。これは、本発明者らが見出した、従来技術にはない新たな知見である。
By adding and mixing a predetermined amount of ferric sulfate with polyaluminum chloride, the present inventors have high storage stability and a metal containing iron ions and aluminum ions having excellent water treatment performance. It was discovered that a salt flocculant was obtained.
Generally, when ferric sulfate having a low basicity is blended with polyaluminum chloride having a high basicity, the gelation reaction of the polyaluminum chloride proceeds as the pH decreases. Further, iron ions in ferric polysulfate generate iron hydroxide and are insolubilized as the pH rises. However, by adjusting the quantitative relationship of the ions constituting the metal salt flocculant of the present invention within a predetermined range, sulfate ions necessary for stabilizing polyaluminum chloride are replenished and gelation is suppressed. Further, for iron ions of ferric polysulfate, it is possible to maintain stability by reducing the supply of alkali.
In general, whether or not a water treatment agent can stably exist in a solution state (storage stability) is often determined by the cation concentration and the molar ratio of anions to cations. Therefore, a stable region was determined based on Al + Fe [mol / L], Cl / Fe (molar ratio), and SO 4 / Al 2O 3 (molar ratio). In addition, Cl / Al 2 O 3 and SO 4 / Fe take peculiar values depending on the chemicals used (polyaluminum chloride and ferric sulfate), and these molar ratios do not change even if the mixing ratio of both chemicals is changed. Therefore, it is not necessary to consider it here.
As a result, it was possible to obtain a metal salt flocculant containing iron ions and aluminum ions containing polyaluminum chloride as a main component and ferric sulfate added / mixed thereto. This is a new finding found by the present inventors that is not found in the prior art.
上記したように、ポリ塩化アルミニウムに対して塩化第二鉄やポリ硫酸第二鉄を混合して高性能の凝集剤を製造することは、これまでも試みられてきたが、混合液の保存安定性が悪いため成功に至らなかった。このような長年の課題を、本発明においては陰イオン/陽イオン（モル比）を調整することで解決したが、本発明者らは、次のメカニズムによるものではないかと推測している。 As described above, it has been tried to produce a high-performance flocculant by mixing ferric chloride or polyferric sulfate with polyaluminum chloride, but the storage stability of the mixed solution has been tried so far. It was not successful because of poor sex. In the present invention, such a long-standing problem was solved by adjusting the anion / cation (molar ratio), but the present inventors speculate that it may be due to the following mechanism.
すなわち、凝集剤としてのポリ塩化アルミニウムには硫酸イオンが含まれていることが多く、この硫酸イオンはポリ塩化アルミニウムの凝集特性や化学的安定性に寄与していると考えられている。
本発明においては、硫酸イオンの含有量を調整してポリ硫酸第二鉄の形態で硫酸イオンを添加することにより、混合液の化学的安定性が向上するばかりではなく、確認はできていないが、アルミニウムイオンと鉄イオンによって形成される多核錯体（多量体）において、ある特定の多核錯体の存在割合が多くなっているのかもしれず、これが本発明の金属塩凝集剤の水処理特性の向上に寄与しているのではないかと推定している。
実際に、以下に具体的に述べるように、本発明の金属塩凝集剤は、広範囲にわたり顕著な作用効果を有する凝集剤となっている。
That is, polyaluminum chloride as a flocculant often contains sulfate ion, and it is considered that this sulfate ion contributes to the aggregation property and chemical stability of polyaluminum chloride.
In the present invention, by adjusting the content of sulfate ion and adding sulfate ion in the form of polyferric sulfate, not only the chemical stability of the mixed solution is improved, but also it has not been confirmed. , In the polynuclear complex (multimer) formed by aluminum ion and iron ion, the abundance ratio of a specific polynuclear complex may be high, which improves the water treatment characteristics of the metal salt flocculant of the present invention. It is estimated that it may be contributing.
In fact, as will be specifically described below, the metal salt flocculant of the present invention is a flocculant having a remarkable effect over a wide range.
本発明で使用するポリ塩化アルミニウムは、Ａｌ濃度が２～６mol/Lの範囲が好適である。また、ポリ硫酸第二鉄は、Ｆｅ濃度が２～４mol/Lの範囲が好適である。
ポリ硫酸第二鉄の添加量が少ないと、鉄含有ポリ塩化アルミニウムの安定性が悪く、良好な凝集能力を発揮することができない。また、当該添加量が多いと、ポリ硫酸第二鉄の加水分解が進行し、副産物として鉄系の殿物が析出してしまうので好ましくない。
本発明で得られる金属塩凝集剤は、ｐＨが３．７～４．２（１００倍希釈溶液）、比重が１．３５～１．４５である。
The polyaluminum chloride used in the present invention preferably has an Al concentration in the range of 2 to 6 mol / L. Further, ferric polysulfate preferably has an Fe concentration in the range of 2 to 4 mol / L.
If the amount of ferric polysulfate added is small, the stability of the iron-containing polyaluminum chloride is poor, and good aggregation ability cannot be exhibited. Further, if the amount added is too large, the hydrolysis of ferric polysulfate proceeds and iron-based deposits are precipitated as a by-product, which is not preferable.
The metal salt flocculant obtained in the present invention has a pH of 3.7 to 4.2 (100-fold diluted solution) and a specific gravity of 1.35 to 1.45.
混合して得られた金属塩凝集剤は、凝集剤としてばかりではなく、リン、窒素、ＣＯＤあるいはＳＳの除去性能において優れており、消臭、脱水、色度低下、細菌やウイルスの除去、フッ素やＴＯＣ除去においても優れた性能を有する。このため、これらの特性を生かして、凝集剤ばかりではなく、様々で広範囲の排水処理剤として使用することができる。 The metal salt flocculant obtained by mixing is excellent not only as a flocculant but also in the removal performance of phosphorus, nitrogen, COD or SS, and is excellent in deodorization, dehydration, chromaticity reduction, removal of bacteria and viruses, and fluorine. It also has excellent performance in removing TOC and TOC. Therefore, by taking advantage of these characteristics, it can be used not only as a flocculant but also as a wide variety of wastewater treatment agents.
（特性評価）
調製した金属塩凝集剤について、次の観点から特性を評価した。
（１）汚泥沈降性（ＳＶ値）
１リットルのメスシリンダー内に活性汚泥を充填し、これに評価対象の各薬剤を添加し、所定時間の静置後に固液分離した汚泥高さから、それぞれの薬剤の汚泥沈降性を評価した。ここで、ＳＶｎにおけるＳＶは汚泥量（Sludge volume）、ｎは静置後の経過時間（分）を表す。
（２）Ｔ－Ｐ、Ｔ－Ｎ、ＣＯＤ、ＳＳ成分の除去特性
活性汚泥に対して評価対象の各薬剤を添加して１時間静置後の上澄み水について、その水質を検査した。Ｔ－Ｐは全リン量、Ｔ－Ｎは全窒素量、ＣＯＤは化学的酸素要求量、ＳＳは懸濁物質を表す。これらの成分の残存量[mg/L]から、これらの成分に対する各薬剤の除去特性を評価した。
（３）消臭特性（硫化水素の抑制効果）
生汚泥に対して評価対象の各薬剤を添加して４時間静置し、その上澄み水に含まれる硫化水素濃度（Ｈ２Ｓ[ppm]）を、ガス検知器を用いて測定した。上澄み水に残留する硫化水素濃度が低いほど消臭特性が優れていると評価できる。
（４）脱水
消化汚泥に対して評価対象の各薬剤を添加し、加圧・脱水後のケーキの含水率[%]を測定した。
（５）色度低下
下水処理場の生物反応槽に評価対象の各薬剤を添加し、最終沈殿池における越流水の色度を測定した。
[実施例１]
(Characteristic evaluation)
The characteristics of the prepared metal salt flocculant were evaluated from the following viewpoints.
(1) Sludge sedimentation property (SV value)
Activated sludge was filled in a 1-liter graduated cylinder, each drug to be evaluated was added thereto, and the sludge sedimentation property of each drug was evaluated from the sludge height separated into solid and liquid after standing for a predetermined time. Here, SV in SVn represents the sludge volume, and n represents the elapsed time (minutes) after standing.
(2) Removal characteristics of TOP, TN, COD, and SS components The water quality of the supernatant water after adding each drug to be evaluated to the activated sludge and allowing it to stand for 1 hour was inspected. T-P represents the total phosphorus content, TN represents the total nitrogen content, COD represents the chemical oxygen demand, and SS represents the suspended solids. From the residual amount [mg / L] of these components, the removal characteristics of each drug for these components were evaluated.
(3) Deodorant characteristics (effect of suppressing hydrogen sulfide)
Each chemical to be evaluated was added to the raw sludge and allowed to stand for 4 hours, and the hydrogen sulfide concentration ( H2 S [ppm]) contained in the supernatant water was measured using a gas detector. It can be evaluated that the lower the concentration of hydrogen sulfide remaining in the supernatant water, the better the deodorizing characteristics.
(4) Dewatering Each chemical to be evaluated was added to the digested sludge, and the water content [%] of the cake after pressurization and dehydration was measured.
(5) Degradation of chromaticity Each chemical to be evaluated was added to the biological reaction tank of the sewage treatment plant, and the chromaticity of the overflow water in the final settling basin was measured.
[Example 1]
（薬剤の調製と安定性評価）
Ａｌ濃度が5.08～5.87mol/Lの濃度が異なるポリ塩化アルミニウムに対して、Ｆｅ濃度が2.93mol/L、比重が1.484のポリ硫酸第二鉄をそれぞれの成分のＳＯ４／Ａｌ２Ｏ３モル比として0.07～0.17の範囲で250mLポリ瓶内で混合・添加し、混合液200gを得た。得られたサンプルを、1g採取し、100mLの純水で希釈して溶液のｐＨを測定した。残りのサンプルは、比重を測定した後、常温下で1か月間保管して、その保存安定性を評価した。
ポリ塩化アルミニウムとポリ硫酸第二鉄との混合条件をそれぞれの成分モル量(ＡｌおよびＦｅ)で表示し、混合後の本発明の金属塩凝集剤の安定性を表１に示す。
(Drug preparation and stability evaluation)
For polyaluminum chloride with different Al concentrations of 5.08 to 5.87 mol / L, SO 4 / Al 2 O 3 mol of each component is made of ferric polysulfate with Fe concentration of 2.93 mol / L and specific gravity of 1.484. The ratio was in the range of 0.07 to 0.17, and the mixture was mixed and added in a 250 mL plastic bottle to obtain 200 g of a mixed solution. 1 g of the obtained sample was collected, diluted with 100 mL of pure water, and the pH of the solution was measured. The remaining samples were stored at room temperature for 1 month after measuring their specific densities, and their storage stability was evaluated.
The mixing conditions of polyaluminum chloride and ferric polysulfate are indicated by the respective component molar amounts (Al and Fe), and the stability of the metal salt flocculant of the present invention after mixing is shown in Table 1.
表１にまとめた実験結果より、1L中にアルミニウムイオンと鉄イオンの合計で5.7モル以下であり、モル比で塩素イオンと鉄イオンの比（Ｃｌ／Ｆｅ）が28以上、硫酸イオンと酸化アルミニウム換算でアルミニウムイオンのモル比（ＳＯ４／Ａｌ２Ｏ３）が0.15以下の場合に、本発明の金属塩凝集剤は安定的に存在することがわかる。
[実施例２]
From the experimental results summarized in Table 1, the total of aluminum ions and iron ions in 1 L is 5.7 mol or less, the ratio of chlorine ions to iron ions (Cl / Fe) is 28 or more in terms of molar ratio, and sulfate ions and aluminum oxide. It can be seen that the metal salt flocculant of the present invention is stably present when the molar ratio of aluminum ions (SO 4 / Al 2 O 3 ) is 0.15 or less in terms of conversion.
[Example 2]
（汚泥沈降性と各成分の除去特性）
下水処理場よりサンプリングした活性汚泥（ＴＳ：0.2%）を1Lメスシリンダーに1,000 mL採取し、ポリ塩化アルミニウム (Ｍ３+ 2.5 mol/L)、ポリ硫酸第二鉄 (Ｍ３+ 2.9 mol/L)、本発明の金属塩凝集剤(Ｍ３+ 5.3 mol/L (Ａｌ３+ 5.1 mol/L, Ｆｅ３+ 0.2 mol/L), Ｃｌ／Ｆｅ65, ＳＯ４／Ａｌ２Ｏ３0.04) の各薬剤を表２の条件で添加・混合した。10分静置後、30分静置後における汚泥の沈降性（ＳＶ10, ＳＶ30）を測定した。ここで、Ｍ３+とは薬剤中に含まれる3価の金属イオン（即ちＡｌ３+とＦｅ３+）濃度の合計を表す。
さらに、1時間静置後の上澄み水について、残留するＴ－Ｐ、Ｔ－Ｎ、ＣＯＤ、ＳＳの各成分の量を分析した。各薬剤の添加量は、表２で示す通り、Ｍ３+がいずれも等しくなるよう設定した。
試験結果は表２の通り。ここで、ＴＳとは全蒸発残留物（Total solids）の略で、ここでは、固形物としての汚泥量を示す。
(Sludge sedimentation and removal characteristics of each component)
Collect 1,000 mL of active sludge (TS: 0.2%) sampled from a sewage treatment plant in a 1 L measuring cylinder, and collect 1,000 mL of polyaluminum chloride (M3 + 2.5 mol / L) and ferric polysulfate (M3 + 2.9 mol / L). ), Each of the metal salt flocculants of the present invention (M 3+ 5.3 mol / L (Al 3+ 5.1 mol / L, Fe 3+ 0.2 mol / L), Cl / Fe65, SO 4 / Al 2 O 3 0.04) The drug was added and mixed under the conditions shown in Table 2. The sludge sedimentation property (SV 10 , SV 30 ) after standing for 10 minutes and after standing for 30 minutes was measured. Here, M 3+ represents the total concentration of trivalent metal ions (that is, Al 3+ and Fe 3+ ) contained in the drug.
Furthermore, the amount of each component of T-P, TN, COD, and SS remaining was analyzed for the supernatant water after standing for 1 hour. As shown in Table 2, the amount of each drug added was set so that M 3+ were all equal.
The test results are shown in Table 2. Here, TS is an abbreviation for total evaporation residue (Total solids), and here, it indicates the amount of sludge as a solid matter.
（汚泥沈降性の評価）
活性汚泥に対して各薬剤を添加した結果、本発明の金属塩凝集剤は、ポリ塩化アルミニウムやポリ硫酸第二鉄よりも少ない添加量で、汚泥沈降性（ＳＶ値）が最も良好であった。特にＳＶ10の値に注目すると、初期の沈降速度に関してその差が顕著に見られたため、薬剤の即効性に優れていることが理解できる。
本発明の金属塩凝集剤の使用により、処理水の固液分離性が大きく向上することから、凝集を目的としたあらゆる水処理設備（例：凝集槽、生物反応槽、重力濃縮槽など）における利用が可能である。
(Evaluation of sludge sedimentation)
As a result of adding each agent to activated sludge, the metal salt flocculant of the present invention had the best sludge sedimentation property (SV value) with a smaller addition amount than polyaluminum chloride and ferric sulfate. .. In particular, paying attention to the value of SV 10 , a remarkable difference was observed in the initial sedimentation rate, so that it can be understood that the drug is excellent in immediate effect.
Since the solid-liquid separability of the treated water is greatly improved by using the metal salt flocculant of the present invention, it is used in all water treatment equipment for the purpose of coagulation (eg, coagulation tank, biological reaction tank, gravity concentration tank, etc.). It can be used.
（Ｔ－Ｐ、Ｔ－Ｎ、ＣＯＤ、ＳＳ成分の除去特性の評価）
本発明の金属塩凝集剤では、ポリ塩化アルミニウムやポリ硫酸第二鉄よりも少ない添加量で、上澄み水からより多くのＴ－Ｐ、Ｔ－Ｎ、ＣＯＤ、ＳＳの除去を行うことができた。
よって、本発明の金属塩凝集剤の使用により、上記成分の効率的な除去・回収が可能であるため、富栄養化対策や水質改善化に向けた効果が見込まれる。
［実施例３］
(Evaluation of removal characteristics of TOP, TN, COD, SS components)
The metal salt flocculant of the present invention was able to remove more T-P, TN, COD, and SS from the supernatant water with a smaller amount of addition than polyaluminum chloride and ferric sulfate. ..
Therefore, the use of the metal salt flocculant of the present invention enables efficient removal and recovery of the above-mentioned components, and is expected to be effective for eutrophication measures and water quality improvement.
[Example 3]
（消臭・硫化水素抑制）
下水処理場よりサンプリングした生汚泥（ＴＳ1.1%）を1Lメスシリンダーに1,000 mL採取し、実施例２で使用したポリ塩化アルミニウム、ポリ硫酸第二鉄、本発明の金属塩凝集剤の各薬剤を表３の条件で添加・混合した。4時間静置後、上澄み水を300mL三角フラスコに100mL採取・密栓・振とうした後、気相部の硫化水素濃度をガス検知管で測定した。薬剤の添加量は、上記と同様に3価の金属イオン濃度が等しくなるように設定した。
試験結果は、表３の通り。
(Deodorant / Hydrogen sulfide suppression)
1,000 mL of raw sludge (TS1.1%) sampled from a sewage treatment plant was collected in a 1 L graduated cylinder, and each of the polyaluminum chloride, ferric sulfate, and metal salt flocculant of the present invention used in Example 2 was collected. Was added and mixed under the conditions shown in Table 3. After standing for 4 hours, 100 mL of the supernatant water was collected in a 300 mL Erlenmeyer flask, sealed, and shaken, and then the hydrogen sulfide concentration in the gas phase was measured with a gas detector tube. The amount of the drug added was set so that the trivalent metal ion concentrations were equal in the same manner as above.
The test results are shown in Table 3.
（消臭特性の評価）
硫化水素の除去率は、ポリ塩化アルミニウム＜本発明の金属塩凝集剤＜ポリ硫酸第二鉄の順となった。一般的に、硫化水素の抑制には鉄イオンによる硫黄の固定化が大きく寄与するため、本発明の金属塩凝集剤は、通常のポリ塩化アルミニウムに比べて高い硫化水素抑制効果を示した。
したがって、本発明の金属塩凝集剤は水処理における消臭用途としての使用も可能である。使用例としては、下水処理場、排水処理施設、ポンプ場、送泥施設などが考えられる。
［実施例４］
(Evaluation of deodorant characteristics)
The removal rate of hydrogen sulfide was in the order of polyaluminum chloride <metal salt flocculant of the present invention <polyferric sulfate. In general, the immobilization of sulfur by iron ions greatly contributes to the suppression of hydrogen sulfide, so that the metal salt flocculant of the present invention showed a higher hydrogen sulfide suppression effect than that of ordinary polyaluminum chloride.
Therefore, the metal salt flocculant of the present invention can also be used as a deodorant in water treatment. Examples of use include sewage treatment plants, wastewater treatment facilities, pumping stations, mud transfer facilities, and the like.
[Example 4]
（脱水特性）
下水処理場よりサンプリングした消化汚泥（ＴＳ1.3%）を500mLビーカーに300mL採取し、実施例２で使用した各無機凝集剤（ポリ塩化アルミニウム、ポリ硫酸第二鉄、本発明の金属塩凝集剤）と高分子凝集剤（0.3wt%, 170ppm）を表４の条件で添加・混合した。60秒間ろ過後、加圧・脱水し、ケーキ含水率を測定した。薬剤の添加量は、上記と同様に3価の金属イオン濃度が等しくなるように設定した。
試験結果は、表４の通り。
(Dehydration characteristics)
300 mL of digested sludge (TS1.3%) sampled from a sewage treatment plant was collected in a 500 mL beaker, and each inorganic flocculant used in Example 2 (polyaluminum chloride, ferric sulfate, metal salt flocculant of the present invention) was collected. ) And the polymer flocculant (0.3wt%, 170ppm) were added and mixed under the conditions shown in Table 4. After filtering for 60 seconds, the cake was pressurized and dehydrated, and the moisture content of the cake was measured. The amount of the drug added was set so that the trivalent metal ion concentrations were equal in the same manner as above.
The test results are shown in Table 4.
（脱水特性の評価）
脱水性はポリ塩化アルミニウム＜ポリ硫酸第二鉄＜本発明の金属塩凝集剤の順に良好であった。本発明の金属塩凝集剤では、薬剤無添加時に比べてケーキの含水率が1.5ポイント低下した。
以上より、本発明の金属塩凝集剤は汚泥含水率の低下を目的とした脱水機への利用も可能であり、最終的に汚泥の運搬や処理費用の削減につながる。
［実施例５］
(Evaluation of dehydration characteristics)
The dehydratibility was good in the order of polyaluminum chloride <ferric sulfate <metal salt flocculant of the present invention. With the metal salt flocculant of the present invention, the water content of the cake was reduced by 1.5 points as compared with the case where no chemical was added.
From the above, the metal salt flocculant of the present invention can be used in a dehydrator for the purpose of reducing the sludge water content, which ultimately leads to the transportation of sludge and the reduction of treatment costs.
[Example 5]
（色度低下特性）
図 1 に示すフローの下水処理場（日平均流入水量：約33,000m3/日、標準活性汚泥法）の生物反応槽末端部に、実施例２で使用したポリ塩化アルミニウム（25mg/L）または本発明の金属塩凝集剤（14mg/L）を1週間連続注入した。薬剤は、ダイヤフラム式定量ポンプを用い、生物反応槽で液中添加した。薬剤の添加量は、上記と同様、3価の金属イオン濃度が等しくなるように設定した。生物反応槽の後段の最終沈殿池より、越流水を定期的にサンプリングし、色度を測定した。
試験結果は、表５の通り。ここで、色度の平均値および最小値は、週平均の値である。
(Characteristics of chromaticity reduction)
Polyaluminum chloride (25 mg / L) used in Example 2 or The metal salt flocculant (14 mg / L) of the present invention was continuously infused for one week. The drug was added in liquid in a biological reaction vessel using a diaphragm type metering pump. The amount of the drug added was set so that the trivalent metal ion concentrations were equal in the same manner as above. Overflow water was periodically sampled from the final settling basin in the latter stage of the biological reaction tank, and the chromaticity was measured.
The test results are shown in Table 5. Here, the average value and the minimum value of the chromaticity are weekly average values.
（色度低下特性の評価）
本発明の金属塩凝集剤では、ポリ塩化アルミニウムよりも少ない添加量で色度低下が顕著に見られた。
したがって、本発明の薬剤は下水の他、上水や中水等の排水への利用も見込まれる。
(Evaluation of chromaticity reduction characteristics)
In the metal salt flocculant of the present invention, a remarkable decrease in chromaticity was observed with a smaller amount of addition than that of polyaluminum chloride.
Therefore, the agent of the present invention is expected to be used not only for sewage but also for wastewater such as clean water and reclaimed water.
（その他の利点）
色度低下試験における実機試験より、本発明の金属塩凝集剤は、通常のポリ塩化アルミニウムと同設備で薬剤注入が可能であった。また、薬剤の使用量を抑えられるため、ローリーの運搬・受入頻度が減少し、これは必要労務や人件費の削減につながる。
(Other advantages)
From the actual machine test in the chromaticity reduction test, the metal salt flocculant of the present invention could be injected with the same equipment as ordinary polyaluminum chloride. In addition, since the amount of chemicals used can be reduced, the frequency of transportation and acceptance of lorries is reduced, which leads to a reduction in required labor and labor costs.
Claims (7)
A chromaticity reducing agent for wastewater containing the metal salt flocculant according to claim 1 or 2.
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