JP2003251399A - Dehydration method for organic sludge high in oils and fats content - Google Patents
Dehydration method for organic sludge high in oils and fats contentInfo
- Publication number
- JP2003251399A JP2003251399A JP2002052726A JP2002052726A JP2003251399A JP 2003251399 A JP2003251399 A JP 2003251399A JP 2002052726 A JP2002052726 A JP 2002052726A JP 2002052726 A JP2002052726 A JP 2002052726A JP 2003251399 A JP2003251399 A JP 2003251399A
- Authority
- JP
- Japan
- Prior art keywords
- organic sludge
- flocculant
- added
- sludge
- organic
- 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
- 239000010802 sludge Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 16
- 235000014593 oils and fats Nutrition 0.000 title abstract description 5
- 230000018044 dehydration Effects 0.000 title abstract description 4
- 238000006297 dehydration reaction Methods 0.000 title abstract description 4
- 125000000129 anionic group Chemical group 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000002378 acidificating effect Effects 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229920000620 organic polymer Polymers 0.000 claims description 26
- 239000000701 coagulant Substances 0.000 claims description 15
- 239000003925 fat Substances 0.000 claims description 7
- 239000003921 oil Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000005345 coagulation Methods 0.000 description 7
- 230000015271 coagulation Effects 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 208000005156 Dehydration Diseases 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 241000282887 Suidae Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229940048053 acrylate Drugs 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229920006318 anionic polymer Polymers 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、主に食品工場など
で発生する有機性汚泥の処理技術に関する。
【０００２】
【従来の技術】従来より、有機性汚泥の脱水処理にはカ
チオン性の有機高分子凝集剤、もしくは硫酸バン土や塩
化第二鉄などの無機凝集剤と両性の有機高分子凝集剤と
の組合わせによって、固形物の凝集処理を行なって脱水
機で固液分離を行なう方法が一般的に採用されている。
【０００３】
【発明が解決しようとする課題】しかしながら、油脂分
を非常に多く含んだ汚泥（例えば豚などの食肉工場の汚
泥）は凝集性が悪く、これらの処方では満足に処理でき
ないケースが発生する。汚泥の凝集性が満足に行なえな
い場合、活性汚泥など排水処理工程に対する負荷が非常
にかかったり、汚泥の脱水ケーキ量が増加し廃棄コスト
が増大するなどの問題が発生する為、汚泥の凝集脱水処
理は確実に行なわれる必要性がある。
【０００４】
【課題を解決するための手段】本発明者らは、このよう
な油脂分を多量に含んだ脱水困難な汚泥を用いて、その
凝集処理方法を鋭意検討した結果、酸性の無機凝集剤で
汚泥を凝集し易い状態に調質し、アニオン性有機高分子
凝集剤、両性の有機高分子凝集剤の順で凝集処理を行な
う方法を見出した。凝集処理された汚泥は、従来から一
般的に用いられているベルトプレス型脱水機や遠心脱水
機で容易に処理される。
【０００５】このように、本発明は油脂を含んでいる有
機質汚泥に凝集剤を添加し、凝集したフロックを分離し
た後脱水機で脱水する有機質汚泥の脱水方法において、
凝集剤として１番目に鉄系もしくはアルミ系酸性無機凝
集剤を添加し、２番目にアニオン系有機高分子凝集剤を
添加し、３番目に両性有機高分子凝集剤を添加すること
を特徴とする有機質汚泥の脱水方法に関する。
【０００６】無機凝集剤は、塩化第二鉄、ポリ硫酸鉄、
ポリ塩化アルミ、硫酸バン土など一般的に水処理で用い
られる薬剤でよい。
【０００７】アニオン性有機高分子凝集剤は、アクリル
アミド−アクリル酸ナトリウムの共重合物が一般的に用
いられる。但し、これに類するアニオン性水溶性高分子
であれば使用可能である。
【０００８】両性の有機高分子凝集剤には、アクリルア
ミド−アクリル酸−ジメチルアミノエチル（メタ）アク
リレートの酸塩（もしくは四級化塩）が広く使われてお
り、それを用いることが出来る。両性凝集剤におけるカ
チオン構成単位とアニオン構成単位のモル比（ＣＶ／Ａ
Ｖ）は１以上が望ましい。また、カチオン構成単位のモ
ル％は５〜５０モル％が望ましい。
【０００９】薬剤の添加順序は
１．無機凝集剤（ｐＨ４〜６へ調整）
２．アニオン性有機高分子凝集剤
３．両性有機高分子凝集剤
の順で添加する。順序が変わると満足な凝集効果が得ら
れないことがあり、最悪の場合には全く凝集しない。各
凝集剤の添加量は、有機質汚泥の固形分に対し、アニオ
ン系有機高分子凝集剤は０．０５〜１重量％、両性有機
高分子凝集剤は０．１〜２重量％程度である。鉄系もし
くはアルミ系酸性無機凝集剤は特に限定はない。
【００１０】本発明方法による凝集メカニズムについて
は、充分に判っていないが、次の様な凝集機構が考えら
れる。
１．無機凝集剤で油脂分を凝結処理し、油脂分を核とし
た微細フロックが形成され、アニオン性有機高分子凝集
剤が吸着作用し易くなる。
２．アニオン性有機高分子凝集剤が生成した微細フロッ
クに吸着する。但し、この段階ではアニオン性有機高分
子凝集剤の吸着力が弱いこと、油脂を核としている点か
ら凝集物の物理的強度が非常に弱く、粗大フロックは生
成されない。
３．両性の有機高分子凝集剤を添加すると、これが油脂
分を核とした微細フロックとアニオン性有機高分子凝集
剤とに反応して不溶化、強固なフロックを生成する。
【００１１】
【実施例】対象汚泥性状（食肉工場の排水処理場汚泥）
（固形物 ２．５％固形物当り：油脂分４０％，蛋白質
３９％，無機質５％，繊維質１１％）
上記供試汚泥を３００ｍｌのビーカーに２００ｍｌ採取
し、実施例および比較例の凝集試験を実施した。撹拌は
ジャーテスターで２５０ｒｐｍの速度に設定した。使用
した有機高分子凝集剤を表１に示す。
【００１２】
【表１】【００１３】実施例１
４０％塩化第二鉄溶液０．３ｍｌを添加し、３０秒間攪
拌し、次いでアニオン性有機高分子凝集剤Ａの０．１％
水溶液７ｍｌを添加し、３０秒間攪拌し、次いで両性有
機高分子凝集剤Ｂの０．２％水溶液１０ｍｌを添加し、
３０秒間攪拌した。
【００１４】実施例２
実施例１においてアニオン性有機高分子凝集剤Ａに代え
て、アニオン性有機高分子凝集剤Ｃの０．１％水溶液７
ｍｌを添加したことを除き、実施例１と同じ処理を行っ
た。
【００１５】比較例１
実施例１においてアニオン性高分子凝集剤Ａの添加ステ
ップを省略したことを除き、実施例１と同じ処理を行っ
た。
【００１６】比較例２
実施例１において両性高分子凝固剤Ｂの添加ステップを
省略したことを除き、実施例１と同じ処理を行った。
【００１７】比較例３
両性高分子凝集剤Ｂの０．２％水溶液１０ｍｌを添加
し、３０秒間攪拌した。
【００１８】比較例４
４０％塩化第二鉄水溶液０．３ｍｌを添加し、３０秒間
攪拌し、次いで両性有機高分子凝集剤Ｂの０．２％水溶
液１０ｍｌを添加し、３０秒間攪拌し、次いでアニオン
性有機高分子凝集剤Ａの０．１％水溶液７ｍｌを添加
し、攪拌した。
【００１９】実施例１−２および比較例１−４において
フロックの凝集状態（フロック径）およびその固液分離
の容易さを評価した結果を表２に示す。
【００２０】
【表２】
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for treating organic sludge mainly generated in food factories and the like. 2. Description of the Related Art Conventionally, for dehydration treatment of organic sludge, a cationic organic polymer flocculant, or an inorganic flocculant such as bansulfate or ferric chloride and an amphoteric organic polymer flocculant have been used. In general, a method of performing a coagulation treatment of a solid material and performing a solid-liquid separation by a dehydrator in combination with the above method is adopted. [0003] However, sludge containing a very large amount of fats and oils (eg, sludge from meat factories such as pigs) has poor cohesiveness, and there are cases where these formulations cannot be treated satisfactorily. I do. If the coagulation property of the sludge cannot be achieved satisfactorily, the load on the wastewater treatment process such as activated sludge will be extremely high, and problems such as an increase in the amount of dewatered cake of the sludge and an increase in the disposal cost will occur. Processing needs to be performed reliably. Means for Solving the Problems The present inventors diligently studied a coagulation treatment method using such a sludge containing a large amount of fats and oils, which was difficult to dehydrate, and as a result, found that acidic inorganic coagulation was carried out. The present inventors have found a method of conditioning sludge to a state in which the sludge is easily flocculated, and performing a flocculation treatment in the order of an anionic organic polymer flocculant and an amphoteric organic polymer flocculant. The coagulated sludge is easily treated by a conventionally used belt press dehydrator or centrifugal dehydrator. As described above, the present invention relates to a method for dewatering organic sludge in which a flocculant is added to organic sludge containing fats and oils, and flocculated flocs are separated and then dewatered by a dehydrator.
As a coagulant, an iron-based or aluminum-based acidic inorganic coagulant is added first, an anionic organic polymer coagulant is added second, and an amphoteric organic polymer coagulant is added third. The present invention relates to a method for dehydrating organic sludge. The inorganic coagulants include ferric chloride, polyiron sulfate,
Chemicals generally used in water treatment such as polyaluminum chloride and bansulfate may be used. As the anionic organic polymer flocculant, a copolymer of acrylamide and sodium acrylate is generally used. However, any similar anionic water-soluble polymer can be used. As the amphoteric organic polymer flocculant, an acid salt (or quaternized salt) of acrylamide-acrylic acid-dimethylaminoethyl (meth) acrylate is widely used, and it can be used. The molar ratio of the cation constituent unit to the anion constituent unit in the amphoteric flocculant (CV / A
V) is desirably 1 or more. Further, the mole% of the cation constituent unit is desirably 5 to 50 mole%. The order of adding the chemicals is as follows. 1. Inorganic flocculant (adjusted to pH 4-6) 2. Anionic organic polymer flocculant The amphoteric organic polymer flocculant is added in this order. If the order is changed, a satisfactory coagulation effect may not be obtained, and in the worst case, no coagulation occurs. The amount of each coagulant added is about 0.05 to 1% by weight of the anionic organic polymer coagulant and about 0.1 to 2% by weight of the amphoteric organic polymer coagulant based on the solid content of the organic sludge. The iron-based or aluminum-based acidic inorganic coagulant is not particularly limited. The mechanism of aggregation according to the method of the present invention is not fully understood, but the following aggregation mechanism is considered. 1. The oils and fats are coagulated with an inorganic coagulant to form fine flocs with the oils and fats as nuclei, and the anionic organic polymer coagulant is easily adsorbed. 2. The anionic organic polymer flocculant adsorbs on the generated fine flocs. However, at this stage, the physical strength of the agglomerate is very weak because of the weak adsorption power of the anionic organic polymer flocculant and the fact that the fat is the core, so that coarse flocs are not generated. 3. When an amphoteric organic polymer flocculant is added, it reacts with a fine floc having an oil or fat as a nucleus and an anionic organic polymer flocculant to insolubilize and form a strong floc. Example sludge properties (sewage treatment plant sludge of a meat factory) (solids 2.5% per solid: 40% fat, 39% protein, 5% inorganic, 11% fiber) 200 ml of the test sludge was collected in a 300 ml beaker, and the coagulation tests of Examples and Comparative Examples were performed. Agitation was set at 250 rpm with a jar tester. Table 1 shows the organic polymer flocculants used. [Table 1] Example 1 0.3 ml of a 40% ferric chloride solution was added, stirred for 30 seconds, and then 0.1% of anionic organic polymer flocculant A was added.
7 ml of an aqueous solution was added and stirred for 30 seconds, and then 10 ml of a 0.2% aqueous solution of amphoteric organic polymer flocculant B was added,
Stirred for 30 seconds. Example 2 In Example 1, a 0.1% aqueous solution of anionic organic polymer flocculant C was used instead of anionic organic polymer flocculant A.
The same procedure as in Example 1 was performed, except that ml was added. Comparative Example 1 The same process as in Example 1 was performed except that the step of adding the anionic polymer flocculant A was omitted. Comparative Example 2 The same processing as in Example 1 was performed, except that the step of adding the amphoteric polymer coagulant B in Example 1 was omitted. Comparative Example 3 10 ml of a 0.2% aqueous solution of amphoteric polymer flocculant B was added and stirred for 30 seconds. Comparative Example 4 0.3 ml of a 40% aqueous ferric chloride solution was added and stirred for 30 seconds. Then, 10 ml of a 0.2% aqueous solution of amphoteric organic polymer flocculant B was added, and the mixture was stirred for 30 seconds. 7 ml of a 0.1% aqueous solution of the anionic organic polymer flocculant A was added and stirred. Table 2 shows the results of evaluating the flocculation state (floc diameter) of flocs and the ease of solid-liquid separation in Example 1-2 and Comparative Examples 1-4. [Table 2]
Claims (1)
加し、凝集したフロックを分離した後脱水機で脱水する
有機質汚泥の脱水方法において、凝集剤として１番目に
鉄系もしくはアルミ系酸性無機凝集剤を添加し、２番目
にアニオン系有機高分子凝集剤を添加し、３番目に両性
有機高分子凝集剤を添加することを特徴とする有機質汚
泥の脱水方法。Claims 1. In a method of dehydrating organic sludge, a flocculant is added to an organic sludge containing fats and oils, and flocculated flocs are separated and then dewatered by a dehydrator. A method for dehydrating organic sludge, comprising adding an iron-based or aluminum-based acidic inorganic coagulant, adding an anionic organic polymer coagulant second, and adding an amphoteric organic polymer coagulant third.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002052726A JP3968698B2 (en) | 2002-02-28 | 2002-02-28 | Dehydration method for organic sludge with high fat content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002052726A JP3968698B2 (en) | 2002-02-28 | 2002-02-28 | Dehydration method for organic sludge with high fat content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003251399A true JP2003251399A (en) | 2003-09-09 |
| JP3968698B2 JP3968698B2 (en) | 2007-08-29 |
Family
ID=28664346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002052726A Expired - Lifetime JP3968698B2 (en) | 2002-02-28 | 2002-02-28 | Dehydration method for organic sludge with high fat content |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013116455A (en) * | 2011-12-05 | 2013-06-13 | Kurita Water Ind Ltd | Flocculant treatment method |
-
2002
- 2002-02-28 JP JP2002052726A patent/JP3968698B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013116455A (en) * | 2011-12-05 | 2013-06-13 | Kurita Water Ind Ltd | Flocculant treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3968698B2 (en) | 2007-08-29 |
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