JPH07251141A - Method for recovering phosphorus from sewage sludge incinerated ash - Google Patents
Method for recovering phosphorus from sewage sludge incinerated ashInfo
- Publication number
- JPH07251141A JPH07251141A JP6047009A JP4700994A JPH07251141A JP H07251141 A JPH07251141 A JP H07251141A JP 6047009 A JP6047009 A JP 6047009A JP 4700994 A JP4700994 A JP 4700994A JP H07251141 A JPH07251141 A JP H07251141A
- Authority
- JP
- Japan
- Prior art keywords
- phosphorus
- solvent
- sewage sludge
- ash
- water
- 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.)
- Pending
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000011574 phosphorus Substances 0.000 title claims abstract description 48
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 48
- 239000010801 sewage sludge Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 28
- 229910021536 Zeolite Inorganic materials 0.000 claims description 12
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 12
- 239000010457 zeolite Substances 0.000 claims description 12
- 239000003960 organic solvent Substances 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 7
- 239000003929 acidic solution Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 229910001385 heavy metal Inorganic materials 0.000 claims description 4
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 30
- 238000000605 extraction Methods 0.000 abstract description 29
- 239000002253 acid Substances 0.000 abstract description 23
- 239000002904 solvent Substances 0.000 abstract description 18
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract description 15
- 239000010802 sludge Substances 0.000 abstract description 12
- 238000000926 separation method Methods 0.000 abstract description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 9
- 239000012535 impurity Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 2
- 230000002378 acidificating effect Effects 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 235000011121 sodium hydroxide Nutrition 0.000 description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 238000000638 solvent extraction Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000037429 base substitution Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、下水の汚泥焼却灰の中
に多量に含有されるリンを回収し、そこで生じた残渣を
無害化する技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for recovering a large amount of phosphorus contained in sewage sludge incineration ash and detoxifying the residue generated therein.
【０００２】[0002]
【従来の技術】従来より下水処理場で発生する汚泥は、
脱水処理及び焼却されており、焼却炉から発生した焼却
灰の大部分は最終処分地へ投棄され、建設資材利用とし
て多少有効利用されているだけで、有効利用度は低い。
また、世論の環境問題への関心の高まりから、現状の汚
泥焼却灰の投棄基準に対し厳しい変更がなされても対応
できるだけの焼却灰の無害化が必要となると予想され
る。2. Description of the Related Art Conventionally, sludge generated in sewage treatment plants has
It has been dehydrated and incinerated, and most of the incineration ash generated from the incinerator is dumped to the final disposal site, and is only being used effectively as a construction material.
In addition, due to growing public concern about environmental issues, it is expected that the incineration ash will need to be detoxified to the extent that severe changes can be made to the current sludge incineration ash disposal standards.
【０００３】一方、最近閉鎖性水域のリン等による富栄
養化の問題から排水の水質汚泥負荷に対する規制が全国
的にますます激しいものとなっている。それゆえ、水処
理の高級化が進み、今後とも活性汚泥（余剰汚泥）の量
は膨大なものとなり、汚泥及び焼却灰中のリン濃度も増
大すると予想される。リンを全量輸入に依存している我
が国の現状を鑑み、汚泥焼却灰からリン分を回収し、資
源化することが必要となっている。On the other hand, recently, due to the problem of eutrophication due to phosphorus and the like in closed water areas, regulations on the water sludge load of wastewater have become increasingly nationwide. Therefore, it is expected that the quality of water treatment will advance, the amount of activated sludge (excess sludge) will become enormous, and the phosphorus concentration in sludge and incinerated ash will also increase in the future. Considering the current situation in Japan, where all phosphorus is imported, it is necessary to recover the phosphorus content from sludge incineration ash and recycle it.
【０００４】活性汚泥およびその焼成物からのリン分の
回収法については、焼成中に活性汚泥のリン分の0.2 〜
10倍等量のカルシウム分を作用させ、硫酸により抽出お
よび中和後、不溶分を除去しリン酸溶液を得ることが示
されている。この方法では酸抽出を行うことでリン分を
抽出することが可能であるが、同時にリン分以外の不純
物が溶出する結果となり、回収したリンを有効に利用す
ることを目的とするうえでは、不純物の多さが問題とな
る。また、この方法ではカルシウム分を作用させるた
め、余分な薬品コストが必要になる。Regarding the method for recovering the phosphorus content from the activated sludge and the fired product thereof, the phosphorus content of
It has been shown that a 10 times equivalent amount of calcium is allowed to act, and after extraction and neutralization with sulfuric acid, insolubles are removed to obtain a phosphoric acid solution. In this method, it is possible to extract the phosphorus content by performing acid extraction, but at the same time, impurities other than the phosphorus content are eluted, and in order to effectively utilize the recovered phosphorus, Is a problem. Further, in this method, since the calcium component acts, an extra chemical cost is required.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、下水の汚泥焼却灰からカルシウム
分を加えるなどの前処理をすることなく、不純物の少な
い状態でリン分を回収することができる下水汚泥焼却灰
からのリン回収法を提供するためになされたものであ
る。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and removes phosphorus content in a state of small impurities without pretreatment such as adding calcium content from sewage sludge incineration ash. It was made to provide a method for recovering phosphorus from sewage sludge incineration ash that can be recovered.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、リン分を含有する下水汚泥焼却
灰から酸性溶液にてリン分を溶出させ、溶出液と不溶性
残渣とを分離し、溶出液を水と２相を形成する有機溶媒
を用いてリン分を抽出することを要旨とするものであ
る。Means for Solving the Problems The present invention made to solve the above problems is to elute the phosphorus content from an incinerated ash of sewage sludge containing the phosphorus content with an acidic solution to obtain an eluate and an insoluble residue. The gist is to separate the eluate and the phosphorus content using an organic solvent that forms two phases with water.
【０００７】本発明の下水汚泥焼却灰からのリン回収法
を図１のフローシートを参照しつつ説明すると次の通り
である。まず、脱水処理された下水汚泥を焼却炉で燃焼
させた焼却灰を、例えば濃度が１Ｎ〜６Ｎ、温度が10〜
90℃の硫酸と酸抽出槽１で混合・攪拌させ、焼却灰と硫
酸を反応させることにより、リン分を酸性溶液中に溶出
させる。反応したスラリー状の灰は例えば遠心分離型の
脱水機２にて固液分離し、リン分を多量に含有する酸抽
出液として取り出す。The phosphorus recovery method from the sewage sludge incineration ash according to the present invention will be described below with reference to the flow sheet of FIG. First, incineration ash obtained by burning dewatered sewage sludge in an incinerator has a concentration of 1 N to 6 N and a temperature of 10 to
The phosphorus content is eluted into the acidic solution by mixing and stirring sulfuric acid at 90 ° C. in the acid extraction tank 1 and reacting the incinerated ash with sulfuric acid. The reacted slurry-like ash is subjected to solid-liquid separation by, for example, a centrifugal dehydrator 2 and taken out as an acid extract containing a large amount of phosphorus.
【０００８】このようにして得られた酸抽出液は粗製リ
ン酸水溶液であるので、後工程として水と２相を形成す
る有機溶媒を用いて、溶媒抽出槽３でリン酸を溶媒抽出
する。溶媒にはヘキサノール、ブタノール、エーテル
類、ケトン類を使用する。攪拌機装備の溶媒抽出槽３中
で酸抽出液と溶媒を常温にして激しく混合攪拌し、分離
槽４にて静置させ、溶媒と抽出残液を分離させる。溶媒
と酸抽出液とを接触・混合させることで、酸抽出液中の
リン分を溶媒中に移行させる。有機溶媒と酸抽出液の混
合比（溶媒／酸抽出液比（mL/g))は１〜10の範囲で行
う。その際、抽出の選択性からリン分のみが溶媒中に移
行し、他の不純物はほとんど移行しない。Since the acid extract thus obtained is a crude phosphoric acid aqueous solution, phosphoric acid is solvent-extracted in the solvent extraction tank 3 by using an organic solvent which forms two phases with water in a subsequent step. Hexanol, butanol, ethers, and ketones are used as the solvent. In the solvent extraction tank 3 equipped with a stirrer, the acid extract and the solvent are vigorously mixed and stirred at room temperature, and allowed to stand in the separation tank 4 to separate the solvent and the extraction residual liquid. The phosphorus content in the acid extract is transferred to the solvent by contacting and mixing the solvent and the acid extract. The mixing ratio of the organic solvent and the acid extract (solvent / acid extract ratio (mL / g)) is in the range of 1 to 10. At that time, due to the selectivity of the extraction, only the phosphorus content migrates into the solvent, and other impurities hardly migrate.
【０００９】また、使用する溶媒によりリン酸の抽出特
性に最適な溶出液中のリン酸濃度があるので、必要に応
じてこの抽出工程で酸抽出中のリン酸濃度を濃縮等によ
り調整する。静置、分離後の溶媒は上部から抜かれ、攪
拌機装備の逆抽出槽５内でリンを抽出した溶媒と水とを
混合・攪拌して、水側に逆抽出する。混合比（溶媒／水
比（mL/g))が１〜10の範囲で混合を行うが、抽出工程と
同様に分離・静置後、分離槽６の下部から精製リン酸と
して取り出す。Further, since there is a phosphoric acid concentration in the eluate that is optimum for the phosphoric acid extraction characteristics depending on the solvent used, the phosphoric acid concentration during acid extraction is adjusted by concentration or the like in this extraction step, if necessary. The solvent after standing and separating is extracted from the upper part, and the solvent in which phosphorus is extracted and water are mixed and stirred in the back extraction tank 5 equipped with a stirrer, and back extracted to the water side. Mixing is performed at a mixing ratio (solvent / water ratio (mL / g)) of 1 to 10, but after separation and standing as in the extraction step, the phosphoric acid is taken out from the lower part of the separation tank 6 as purified phosphoric acid.
【００１０】酸抽出工程にて遠心分離された固液残渣は
苛性ソーダとともに中和槽７へ注入され、中性の残渣と
なる。酸抽出された際に焼却灰中に含有される不純物、
特に有害重金属も溶出することにより無害灰として取り
出すことが可能になる。また、中性にする際、苛性ソー
ダを使用せず、数回水にて洗浄することで中性無害灰と
して取り出すことができる。苛性ソーダを用いないこと
で、薬品コストを下げることにつながる。The solid-liquid residue centrifuged in the acid extraction step is injected into the neutralization tank 7 together with caustic soda to become a neutral residue. Impurities contained in the incinerated ash when extracted with acid,
Particularly, harmful heavy metals can be extracted as harmless ash by elution. Further, when neutralizing, neutral caustic ash can be taken out by washing with water several times without using caustic soda. Not using caustic soda will lead to lower chemical costs.
【００１１】抽出工程にて発生した残渣を中和し、無害
灰する前および後にてゼオライトを製造することができ
る。このためには中和残渣を濃度が１Ｎから４Ｎの範
囲、温度が80〜90℃の範囲のNaOH水溶液と反応時間５〜
７hrで反応させる。生成したゼオライトを脱水後、取り
出す。酸抽出工程で発生した残渣を中和せず直接ゼオラ
イトを生成する場合、中和反応で未反応のNaOH濃度が上
記の１〜４Ｎとなるように調製したNaOH溶液を加え、上
記の反応温度、時間に準じて水熱合成反応させゼオライ
トを生成させる。Zeolite can be produced before and after the residue generated in the extraction step is neutralized to produce harmless ash. To this end, the neutralization residue is treated with an aqueous solution of NaOH having a concentration of 1N to 4N and a temperature of 80 to 90 ° C for a reaction time of 5 to
React in 7 hours. The produced zeolite is dehydrated and then taken out. In the case of directly producing zeolite without neutralizing the residue generated in the acid extraction step, a NaOH solution prepared so that the unreacted NaOH concentration becomes 1 to 4N in the neutralization reaction is added to the above reaction temperature, Zeolite is produced by hydrothermal synthesis reaction according to time.
【００１２】酸抽出工程では、リン酸として回収率86％
に到達し、有機溶媒抽出により、有害重金属等の不純物
の少ない精製リン酸溶液が得られる。抽出工程にて発生
した残渣は無害化され、ゼオライトを生成させることも
確認できた。In the acid extraction step, the recovery rate as phosphoric acid is 86%.
By the extraction with an organic solvent, a purified phosphoric acid solution containing few impurities such as harmful heavy metals can be obtained. It was also confirmed that the residue generated in the extraction step was detoxified and zeolite was produced.
【００１３】[0013]
【作用】上記したように、本発明によれば下水汚泥焼却
灰から有害重金属等の不純物の少ない精製リン酸溶液と
して、リン分を高い回収率で回収することができる。下
水汚泥処理においては焼却炉から発生する焼却灰を処分
するための莫大な埋め立て処分費用が問題となってお
り、処分用地の確保も将来的に困難となる状況下にある
が、本発明によればこの問題を解決することができる。
しかも、リンは肥料としての重要な原料の一つで、我が
国では産出されておらず、全量輸入に依存している現状
からも、本発明の価値は高いものである。さらに焼却灰
中には有害物質が含有されているが、リン回収した後の
抽出残渣は無害化、減容化され、処分投棄基準を十分に
クリアすることが可能となるのみならず、ゼオライトを
製造することも可能である。As described above, according to the present invention, the phosphorus content can be recovered from the sewage sludge incinerator ash as a purified phosphoric acid solution containing few impurities such as harmful heavy metals at a high recovery rate. In the treatment of sewage sludge, enormous landfill disposal costs for disposing of the incineration ash generated from the incinerator has become a problem, and securing the site for disposal is in a situation where it will be difficult in the future, but according to the present invention. If this problem can be solved.
Moreover, phosphorus is one of the important raw materials as a fertilizer, it is not produced in Japan, and the present invention is highly valuable because it depends on the whole import. Furthermore, although the incineration ash contains harmful substances, the extraction residue after phosphorus recovery is detoxified and volume-reduced, and it is possible not only to fully meet the disposal and disposal standards, but also to remove zeolite. It is also possible to manufacture.
【００１４】[0014]
【実施例】以下に本発明の内容をより具体的に示す。 〔１．酸抽出実験〕大都市Ａ下水処理場から発生した余
剰汚泥に高分子凝集剤を添加し、その後脱水した脱水汚
泥を流動床型焼却炉にて焼却させ、下水汚泥焼却灰を得
た。この焼却灰の組成を表１に示す。なお、水分以外の
値はドライベースとする。EXAMPLES The content of the present invention will be more specifically described below. [1. Acid Extraction Experiment] A polymer coagulant was added to excess sludge generated from a large city A sewage treatment plant, and then dehydrated dehydrated sludge was incinerated in a fluidized bed incinerator to obtain sewage sludge incineration ash. The composition of this incinerated ash is shown in Table 1. Values other than water content are dry base.
【００１５】[0015]
【表１】 [Table 1]
【００１６】内容量２Ｌの容器に純水1000ｇ、濃硫酸20
0 ｇを攪拌・混合し、50℃前後に調整した。その後、上
記焼却灰100 ｇを溶液中に投入し、攪拌棒を攪拌器にて
回転させることにより激しく焼却灰と溶液を２時間反応
させ、スラリーを得た。反応終了後、そのスラリーを遠
心分離を用いて回転数3000rpm 、15分間固液分離を施
し、酸抽出液を得た。抽出に用いた焼却灰中のリン分
（Ｐ換算）は8.3 ｇ、またこの抽出液中のリン分（Ｐ換
算）は7.1 ｇであり、リン分の回収率は86％と高いもの
となった。また、固液分離後の残渣を純水にて洗浄した
後、2N−NaOH水溶液に投入し、攪拌・混合することで中
和した。1000 g of pure water and 20% concentrated sulfuric acid in a container having an internal volume of 2 L
0 g was stirred and mixed, and the temperature was adjusted to around 50 ° C. Then, 100 g of the incinerated ash was put into the solution, and the incinerator ash was vigorously reacted with the solution for 2 hours by rotating a stirring rod with a stirrer to obtain a slurry. After the completion of the reaction, the slurry was subjected to solid-liquid separation for 15 minutes at 3000 rpm by centrifugation to obtain an acid extract. The phosphorus content (P conversion) in the incineration ash used for extraction was 8.3 g, and the phosphorus content (P conversion) in this extract was 7.1 g, and the recovery rate of phosphorus content was as high as 86%. . Further, the residue after solid-liquid separation was washed with pure water, then put into a 2N-NaOH aqueous solution, and stirred and mixed for neutralization.
【００１７】〔２．溶媒抽出実験〕上記酸抽出工程にて
抽出したリンを有機溶媒にて精製リン酸として抽出す
る。内容量200mL のビーカーに酸抽出液20ｇ、有機溶媒
40mlを混合（混合比２(mL/g)) し、室温で激しく１時間
攪拌した。有機溶媒には、１−ブタノールを用いた。混
合液を静置し、溶媒と抽出残液を分離した後、逆抽出を
行った。逆抽出率は50％であった。また、得られた精製
リン酸中の有害物質の含有量は以下の表２の通りであっ
た。[2. Solvent extraction experiment] Phosphorus extracted in the above-mentioned acid extraction step is extracted as purified phosphoric acid with an organic solvent. 20g of acid extract and organic solvent in a beaker with a capacity of 200mL
40 ml was mixed (mixing ratio 2 (mL / g)) and stirred vigorously at room temperature for 1 hour. 1-Butanol was used as the organic solvent. The mixed solution was allowed to stand, the solvent and the extraction residual liquid were separated, and then back extraction was performed. The back extraction rate was 50%. The contents of harmful substances in the obtained purified phosphoric acid are shown in Table 2 below.
【００１８】[0018]
【表２】 [Table 2]
【００１９】〔３．ゼオライト生成〕大都市Ｂ処理場か
ら発生した汚泥焼却灰からリンを回収し、酸抽出した際
に発生した残渣からゼオライトを生成できた。用いた焼
却灰の組成を表３に示す。[3. Zeolite production] Phosphorus was recovered from the sludge incineration ash generated from the big city B treatment plant, and zeolite could be generated from the residue generated during acid extraction. Table 3 shows the composition of the incinerated ash used.
【００２０】[0020]
【表３】 [Table 3]
【００２１】実施例に準じて、酸抽出した際発生した残
渣を水にて洗浄中和した後乾燥し、無害灰を得た。その
灰と2N-NaOH を液固比10ml/gの割合で混合・攪拌させ
た。その反応温度は90℃、時間は７hrであった。この結
果、ゼオライトが水熱合成された。NH4 + イオンの吸着
試験を行い、合成されたゼオライトの吸着能を調べた。
塩基置換容量CEC(meq/100g)は450 ほどとなり、合成ゼ
オライトのそれと同様の吸着能を持つことが確認され
た。According to the example, the residue generated upon acid extraction was washed with water, neutralized and dried to obtain harmless ash. The ash and 2N-NaOH were mixed and stirred at a liquid-solid ratio of 10 ml / g. The reaction temperature was 90 ° C. and the time was 7 hours. As a result, zeolite was hydrothermally synthesized. The adsorption test of NH 4 + ions was conducted to examine the adsorption ability of the synthesized zeolite.
The base substitution capacity CEC (meq / 100g) was about 450, confirming that it has an adsorption capacity similar to that of synthetic zeolite.
【００２２】[0022]
【発明の効果】以上に説明したように、本発明の下水汚
泥焼却灰からのリン回収法によれば、従来は処分に困っ
ていた下水汚泥焼却灰から有用なリンを高い回収率で回
収することができる。しかも従来のようにカルシウム分
を加えるなどの前処理をする必要がないので薬品コスト
が低減でき、しかも不純物の少ない状態でリン分を回収
することができる。またリンを回収した後の抽出残渣は
無害化されるので処理が容易となる。As described above, according to the method for recovering phosphorus from sewage sludge incinerator ash of the present invention, useful phosphorus is recovered at a high recovery rate from sewage sludge incinerator ash, which has been difficult to dispose in the past. be able to. Moreover, since it is not necessary to perform a pretreatment such as adding calcium as in the conventional case, the chemical cost can be reduced, and the phosphorus can be recovered in a state where the amount of impurities is small. In addition, the extraction residue after recovering phosphorus is rendered harmless, which facilitates the treatment.
【図１】本発明の工程の一例を示すフローシートであ
る。FIG. 1 is a flow sheet showing an example of steps of the present invention.
１ 酸抽出槽、２ 脱水機、３ 溶媒抽出槽、４ 分離
槽、５逆抽出槽、６ 分離槽、７ 中和槽1 acid extraction tank, 2 dehydrator, 3 solvent extraction tank, 4 separation tank, 5 back extraction tank, 6 separation tank, 7 neutralization tank
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０１Ｂ 39/54 Ｃ０２Ｆ 11/00 Ｃ 11/06 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication C01B 39/54 C02F 11/00 C 11/06 Z
Claims (3)
性溶液にてリン分を溶出させ、溶出液と不溶性残渣とを
分離し、この溶出液から水と２相を形成する有機溶媒を
用いてリン分を抽出することを特徴とする下水汚泥焼却
灰からのリン分の回収法。1. A phosphorus content-containing sewage sludge incinerator ash is eluted with an acidic solution to separate the phosphorus content from the insoluble residue, and an organic solvent that forms two phases with water is used from this eluate. A method for recovering phosphorus from sewage sludge incinerator ash, which is characterized by extracting phosphorus.
ら酸性溶液にてリン分を抽出させた後、溶出液及び残渣
を分離し、その残渣をNaOH水溶液を用いて中和させ、重
金属の含有量が小さい無害灰化することを特徴とする下
水汚泥焼却灰からのリン分の回収法。2. After extracting the phosphorus content from the sewage sludge incinerator ash with an acidic solution according to the process of claim 1, the eluate and the residue are separated, and the residue is neutralized with an aqueous NaOH solution to remove heavy metals. A method for recovering phosphorus from sewage sludge incineration ash, which is characterized by making harmless ash with a small content.
てゼオライト生成させる請求項７に記載の下水汚泥焼却
灰からのリン分の回収法。3. The method for recovering phosphorus from sewage sludge incinerator ash according to claim 7, wherein an aqueous solution of NaOH is excessively added to perform hydrothermal synthesis to produce zeolite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6047009A JPH07251141A (en) | 1994-03-17 | 1994-03-17 | Method for recovering phosphorus from sewage sludge incinerated ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6047009A JPH07251141A (en) | 1994-03-17 | 1994-03-17 | Method for recovering phosphorus from sewage sludge incinerated ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07251141A true JPH07251141A (en) | 1995-10-03 |
Family
ID=12763177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6047009A Pending JPH07251141A (en) | 1994-03-17 | 1994-03-17 | Method for recovering phosphorus from sewage sludge incinerated ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07251141A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6022514A (en) * | 1998-05-18 | 2000-02-08 | Nkk Corporation | Method for recovering phosphorus from organic sludge |
| JP2001198545A (en) * | 2000-01-18 | 2001-07-24 | Kawasaki City | Treatment process of sludge incineration ash |
| JP2002079081A (en) * | 2000-09-06 | 2002-03-19 | Sumitomo Osaka Cement Co Ltd | Porous powder, and method for manufacturing and using the same |
| JP2009011197A (en) * | 2007-07-02 | 2009-01-22 | Univ Of Miyazaki | Culture medium for photosynthetic organism utilizing incineration ash and method for producing the same and method for culturing photosynthetic organism |
| JP2010227771A (en) * | 2009-03-26 | 2010-10-14 | Sumitomo Osaka Cement Co Ltd | Waste treating method |
| US7901582B2 (en) | 2008-03-19 | 2011-03-08 | Kabushiki Kaisha Toshiba | Phosphorus recovery method and phosphorus recovery system |
| JP2011213558A (en) * | 2010-04-01 | 2011-10-27 | Kobelco Eco-Solutions Co Ltd | Method for recovering phosphoric acid from steelmaking slag |
| WO2015072740A1 (en) * | 2013-11-15 | 2015-05-21 | 김용환 | Method for treating organic waste liquid including sludge and waste water using solvent extraction |
| JP2015120164A (en) * | 2015-03-04 | 2015-07-02 | 月島テクノメンテサービス株式会社 | Incineration processing method of sewage sludge and sewage processing facility |
| CN108910849A (en) * | 2018-07-23 | 2018-11-30 | 四川大学 | A method of circulation extracts phosphorus from sludge ash |
| CN110628078A (en) * | 2019-09-26 | 2019-12-31 | 山东一诺威新材料有限公司 | Recyclable polyether filter residue harmless treatment process method |
| JP2020192483A (en) * | 2019-05-24 | 2020-12-03 | 国立大学法人 新潟大学 | Processing method |
| EP4015452A1 (en) * | 2020-12-21 | 2022-06-22 | Técnicas Reunidas, S.A. | Process for producing technical grade phosphoric acid from sewage sludge ash |
-
1994
- 1994-03-17 JP JP6047009A patent/JPH07251141A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6022514A (en) * | 1998-05-18 | 2000-02-08 | Nkk Corporation | Method for recovering phosphorus from organic sludge |
| JP2001198545A (en) * | 2000-01-18 | 2001-07-24 | Kawasaki City | Treatment process of sludge incineration ash |
| JP2002079081A (en) * | 2000-09-06 | 2002-03-19 | Sumitomo Osaka Cement Co Ltd | Porous powder, and method for manufacturing and using the same |
| JP2009011197A (en) * | 2007-07-02 | 2009-01-22 | Univ Of Miyazaki | Culture medium for photosynthetic organism utilizing incineration ash and method for producing the same and method for culturing photosynthetic organism |
| US7901582B2 (en) | 2008-03-19 | 2011-03-08 | Kabushiki Kaisha Toshiba | Phosphorus recovery method and phosphorus recovery system |
| JP2010227771A (en) * | 2009-03-26 | 2010-10-14 | Sumitomo Osaka Cement Co Ltd | Waste treating method |
| JP2011213558A (en) * | 2010-04-01 | 2011-10-27 | Kobelco Eco-Solutions Co Ltd | Method for recovering phosphoric acid from steelmaking slag |
| WO2015072740A1 (en) * | 2013-11-15 | 2015-05-21 | 김용환 | Method for treating organic waste liquid including sludge and waste water using solvent extraction |
| JP2015120164A (en) * | 2015-03-04 | 2015-07-02 | 月島テクノメンテサービス株式会社 | Incineration processing method of sewage sludge and sewage processing facility |
| CN108910849A (en) * | 2018-07-23 | 2018-11-30 | 四川大学 | A method of circulation extracts phosphorus from sludge ash |
| JP2020192483A (en) * | 2019-05-24 | 2020-12-03 | 国立大学法人 新潟大学 | Processing method |
| CN110628078A (en) * | 2019-09-26 | 2019-12-31 | 山东一诺威新材料有限公司 | Recyclable polyether filter residue harmless treatment process method |
| EP4015452A1 (en) * | 2020-12-21 | 2022-06-22 | Técnicas Reunidas, S.A. | Process for producing technical grade phosphoric acid from sewage sludge ash |
| WO2022136212A1 (en) | 2020-12-21 | 2022-06-30 | Técnicas Reunidas, S.A. | Process for producing technical grade phosphoric acid from sewage sludge ash |
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