JPH10230254A - Lightweight dephosphorizing agent and removing method of phosphorus in organic waste water using the same - Google Patents

Lightweight dephosphorizing agent and removing method of phosphorus in organic waste water using the same

Info

Publication number
JPH10230254A
JPH10230254A JP9035287A JP3528797A JPH10230254A JP H10230254 A JPH10230254 A JP H10230254A JP 9035287 A JP9035287 A JP 9035287A JP 3528797 A JP3528797 A JP 3528797A JP H10230254 A JPH10230254 A JP H10230254A
Authority
JP
Japan
Prior art keywords
lightweight
phosphorus
dephosphorizing agent
aeration tank
fine particles
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
Application number
JP9035287A
Other languages
Japanese (ja)
Inventor
Katsuyuki Kataoka
克之 片岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Original Assignee
Ebara Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ebara Corp filed Critical Ebara Corp
Priority to JP9035287A priority Critical patent/JPH10230254A/en
Publication of JPH10230254A publication Critical patent/JPH10230254A/en
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

PROBLEM TO BE SOLVED: To provide a novel technology capable of treating a phosphorus- containing organic waste water such as a sewage with a low cost equipment at a low running cost without installing a sand filtration device or an activated carbon adsorbing column like the conventional technology. SOLUTION: This lightweight dephosphorizing agent is obtained by mixing a lightweight fine particle with a dephosphorizing agent fine particle such as aluminum hydroxide and binding with an adequate water resistant binder and has a specific gravity of nearly 1, preferably 0.9-1.1. A biological treatment of the organic waste water is performed by charging the lightweight dephosphorizing agent to an aeration tank of a biological treating device of the organic waste water, simultaneously carrying out the biological treatment and the dephosphorizing treatment while suspending and fluidizing by aeration air and after that, separating the lightweight dephosphorizing agent from a slurry in the biological aeration tank by a screen and regenerating to use for the treatment again.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、新規な粒状脱リン
剤に関し、さらに前記粒状脱リン剤を用いて行う有機性
汚水からのリン除去方法に関するものであり、特に活性
汚泥と粒状脱リン剤の混合物から容易に粒状脱リン剤を
分離し、再生し、再利用できる有機性汚水からのリン除
去方法に関するものである。The present invention relates to a novel granular dephosphorizing agent, and more particularly to a method for removing phosphorus from organic wastewater using the above granular dephosphorizing agent, and more particularly to activated sludge and granular dephosphorizing agent. The present invention relates to a method for removing phosphorus from organic wastewater which can easily separate, regenerate and reuse a particulate dephosphorizing agent from a mixture of the above.

【０００２】[0002]

【従来の技術】従来から、下水などリンを含有する有機
性汚水からリンを除去する方法として、活性汚泥法の曝
気槽にアルミニウム系あるいは鉄系の無機凝集剤を添加
して生物処理とリン除去を同時に行う「凝集剤添加活性
汚泥法」がよく行われている。この理由は、既存の汚水
処理施設が利用でき、新たにリン除去のための凝集沈殿
装置を設置する必要がないためである。アルミニウム系
あるいは鉄系の無機凝集剤としては、硫酸ばん土、ＰＡ
Ｃ、塩化第２鉄、ポリ硫酸鉄が使用されている。「凝集
剤添加活性汚泥法」は、リンを除去することはできる
が、リンの除去に伴って不可避的にリン酸アルミスラッ
ジ、リン酸鉄スラッジ、水酸化アルミスラッジ、水酸化
鉄スラッジなどの難脱水性の凝集汚泥が発生し余剰汚泥
発生量が増えることになり、その結果この方法では汚泥
処理が困難でその問題の解決が望まれていた。また、除
去されたリンは汚泥として破棄せざるを得ず、リンを資
源として回収することができないという大きな欠点があ
った。2. Description of the Related Art Conventionally, as a method of removing phosphorus from organic wastewater containing phosphorus such as sewage, biological treatment and phosphorus removal by adding an aluminum-based or iron-based inorganic coagulant to an activated sludge aeration tank. Activated sludge method with coagulant is often performed simultaneously. The reason for this is that the existing sewage treatment facility can be used, and it is not necessary to newly install a coagulation sedimentation apparatus for removing phosphorus. Aluminum or iron-based inorganic coagulants include sodium sulfate, PA
C, ferric chloride, and polyiron sulfate are used. The activated sludge method with a coagulant can remove phosphorus, but inevitably involves the removal of phosphorus phosphate, aluminum phosphate sludge, aluminum hydroxide sludge, and iron hydroxide sludge. Dewatering coagulated sludge is generated and the amount of surplus sludge generated increases. As a result, sludge treatment is difficult with this method, and it has been desired to solve the problem. Further, there is a major drawback that the removed phosphorus must be discarded as sludge, and the phosphorus cannot be recovered as a resource.

【０００３】また、有機性汚水や河川水からリンを除去
する方法として、本発明者は微粒子からなる脱リン剤を
用いる方法を提案しているが、この脱リン剤は微粒子状
のものであるために、活性汚泥などと分離することが困
難であって、脱リン剤を返送汚泥と共に循環することは
できるが、外部へ出る余剰汚泥から脱リン剤を分離する
ことが困難であるために、その分の脱リン剤が外部に出
てしまうという問題があった。この場合にはその分だけ
脱リン剤が損失となるものであって、コスト面からいっ
てマイナスのことである。As a method for removing phosphorus from organic wastewater and river water, the present inventors have proposed a method using a dephosphorizing agent composed of fine particles, but this dephosphorizing agent is in the form of fine particles. Therefore, it is difficult to separate from the activated sludge and the like, and the dephosphorizing agent can be circulated together with the returned sludge.However, since it is difficult to separate the dephosphorizing agent from the excess sludge going out, There was a problem that the dephosphorizing agent came out to the outside. In this case, the dephosphorizing agent is lost by that much, which is a minus in terms of cost.

【０００４】[0004]

【発明が解決しようとする課題】本発明は、前記従来技
術の欠点を解決することを課題とするものである。すな
わち、難脱水性の凝集汚泥が発生せず、回収したリンは
資源として再生できる新技術を提供することにある。さ
らに、脱リン剤が損失とならないため、処理コストがか
なり低く抑えることができる。SUMMARY OF THE INVENTION An object of the present invention is to solve the disadvantages of the prior art. That is, it is an object of the present invention to provide a new technology that does not generate hardly dewaterable coagulated sludge and that can recover recovered phosphorus as a resource. Further, since the dephosphorizing agent is not lost, the processing cost can be considerably reduced.

【０００５】[0005]

【課題を解決するための手段】本発明の上記課題は、下
記に示す本発明の軽量脱リン剤及びそれを用いた有機性
汚水のリン除去方法によって解決することができた。 （１）リン酸イオン吸着性を有する微粒子と軽量微粒子
とを混合し、比重が１に近い粒子に造粒して、水中にお
ける曝気により容易に流動する性質の粒状物に成形され
ていることを特徴とする軽量脱リン剤。 （２）前記リン酸イオン吸着性を有する微粒子が活性ア
ルミナ、水酸化アルミニウム、酸化鉄、水酸化鉄、酸化
チタン、酸化ジルコニウムの少なくとも１種からなるも
のであることを特徴とする前記（１）に記載の軽量脱リ
ン剤。The above objects of the present invention have been attained by the following lightweight phosphorus removing agent of the present invention and a method for removing phosphorus from organic wastewater using the same. (1) A mixture of fine particles having phosphate ion adsorption properties and lightweight fine particles, granulated into particles having a specific gravity close to 1, and formed into a granular material having a property of easily flowing by aeration in water. Features a lightweight dephosphorizer. (2) The above-mentioned (1), wherein the fine particles having a phosphate ion-adsorbing property are made of at least one of activated alumina, aluminum hydroxide, iron oxide, iron hydroxide, titanium oxide and zirconium oxide. 2. The lightweight dephosphorizing agent according to item 1.

【０００６】（３）前記軽量微粒子が、中空ガラス質球
状粉体、人工軽量骨材などの無機質材料を焼成・発泡さ
せて得たマイクロバルーン、あるいは発泡プラスチック
粉体の少なくとも１種からなるものであることを特徴と
する前記（１）に記載の軽量脱リン剤。 （４）前記（１）記載の軽量脱リン剤を、有機性汚水を
生物処理する曝気槽に投入し、生物処理とリン吸着除去
を同時に行うことを特徴とする有機性汚水のリン除去方
法。 （５）前記軽量脱リン剤を投入した前記曝気槽の活性汚
泥と前記軽量脱リン剤を含むスラリーをスクリーンに通
過させて、前記スラリーから軽量脱リン剤を分離し、分
離された軽量脱リン剤を再生した後、前記曝気槽に再投
入することを特徴とする前記（４）記載の有機性汚水の
リン除去方法。(3) The lightweight fine particles are made of at least one kind of microballoons obtained by firing and foaming inorganic materials such as hollow glassy spherical powders and artificial lightweight aggregates, or foamed plastic powders. The lightweight dephosphorizing agent according to the above (1), wherein (4) A method for removing phosphorus from organic sewage, wherein the lightweight dephosphorizing agent according to (1) is introduced into an aeration tank for biologically treating organic sewage, and biological treatment and phosphorus adsorption and removal are simultaneously performed. (5) The activated sludge in the aeration tank charged with the lightweight dephosphorizing agent and a slurry containing the lightweight dephosphorizing agent are passed through a screen to separate the lightweight dephosphorizing agent from the slurry. The method for removing phosphorus from organic wastewater according to the above (4), wherein the agent is regenerated and then re-introduced into the aeration tank.

【０００７】[0007]

【発明の実施の形態】本発明の軽量脱リン剤を作るのに
用いるリン酸イオン吸着性を有する微粒子としては、粉
末活性アルミナ、水酸化アルミニウム、水酸化鉄、酸化
鉄、酸化チタン、酸化ジルコニウム、その他の酸化アル
ミニウムなどが挙げられるが、特に水酸化鉄、水酸化ア
ルミニウムが好適である。本発明者の研究によれば、リ
ン吸着性の良い水酸化鉄、水酸化アルミニウムは、ポリ
鉄（ポリ硫酸第２鉄）、塩化第２鉄、硫酸バンド、ＰＡ
Ｃ等の鉄塩、アルミニウム塩水溶液をアルカリでｐＨ５
〜８に中和すれば良いことが判明した。アルカリとして
は、水酸化マグネシウム、消石灰、水酸化ナトリウムが
採用できる。BEST MODE FOR CARRYING OUT THE INVENTION The fine particles having a phosphate ion-adsorbing property used for producing the lightweight dephosphorizing agent of the present invention include powdered activated alumina, aluminum hydroxide, iron hydroxide, iron oxide, titanium oxide and zirconium oxide. And other aluminum oxides, among which iron hydroxide and aluminum hydroxide are particularly preferred. According to the study of the present inventor, iron hydroxide and aluminum hydroxide having good phosphorus adsorptivity are polyiron (ferric polysulfate), ferric chloride, sulfate band, PA
An aqueous solution of an iron salt such as C or an aluminum salt is pH 5 with alkali.
It turned out that it is sufficient to neutralize to ~ 8. As the alkali, magnesium hydroxide, slaked lime and sodium hydroxide can be employed.

【０００８】また、それに混合する軽量微粒子として
は、中空ガラス質球状粉体、シラスガラスなどの発泡性
無機質材料を焼成・発泡させて得たマイクロバルーン、
あるいは発泡プラスチック粉体の少なくとも１種が挙げ
られるが、その他このような性質をもつものであれば何
でも使用することができる。前記中空ガラス質球状粉体
は、ほう酸ガラス粉末を加熱発泡させたマイクロバルー
ンで、日本では鹿児島県等で多産するシラスあるいは火
山灰の粉末を高温に急熱し発泡させて作製したガラスマ
イクロバルーンが知られている。また、人工軽量骨材は
火山ガラスまたはそれを変成したパーライトを高温に急
熱し発泡させたものやバーミキュライト（一種の雲母）
をやはり高温に急熱し膨張させて作製したものである。[0008] The lightweight fine particles to be mixed therein include microballoons obtained by firing and foaming a foamable inorganic material such as hollow glassy spherical powder and shirasu glass.
Alternatively, at least one kind of foamed plastic powder can be used, but any other material having such properties can be used. The hollow vitreous spherical powder is a micro-balloon formed by heating and foaming borate glass powder, and a glass micro-balloon produced by rapidly heating foam of shirasu or volcanic ash produced in Kagoshima Prefecture in Japan to a high temperature and foaming is used. Have been. Artificial lightweight aggregates are made of volcanic glass or its modified pearlite which is rapidly heated to high temperature and foamed, or vermiculite (a kind of mica)
Was also rapidly heated to a high temperature and expanded.

【０００９】軽量微粒子の粒径としては、１〜５００μ
ｍの範囲のものが挙げられるが、１０〜３００μｍの範
囲のものが好ましい。そして、その混合割合としては、
リン酸イオン吸着性微粒子１に対して軽量微粒子０．１
〜１０の範囲とすることができるが、１：０．２〜３の
範囲とすることが好ましい。いずれにしても、造粒によ
り得られる軽量脱リン剤の比重が１に近いもの、すなわ
ちその比重が０．９〜１．１の範囲となるような割合と
することが必要である。なお、この比重は、曝気されて
いる条件において軽量脱リン剤が水中を浮遊するような
状態を保持できるような範囲であることを意味してお
り、厳密に上記の範囲に入ることを求められるものでは
ない。また、この軽量脱リン剤は、水中で使用される関
係から、その比重としては水中で浸漬した時の比重でい
うことが実際的である。The particle size of the lightweight fine particles is 1 to 500 μm.
m, but preferably in the range of 10 to 300 μm. And, as the mixing ratio,
Phosphate ion-adsorbing fine particles 1 and lightweight fine particles 0.1
Although it can be in the range of 10 to 10, it is preferably in the range of 1: 0.2 to 3. In any case, it is necessary that the specific gravity of the lightweight dephosphorizing agent obtained by granulation is close to 1, that is, the ratio is such that the specific gravity is in the range of 0.9 to 1.1. In addition, this specific gravity means that it is in a range that the lightweight dephosphorizing agent can maintain a state of floating in water under aerated conditions, and is required to strictly fall within the above range. Not something. In addition, since this lightweight phosphorus removing agent is used in water, it is practical to refer to the specific gravity when immersed in water.

【００１０】得る軽量脱リン剤の粒径としては、５００
μｍ〜１０ｍｍの範囲、好ましくは１〜３ｍｍの範囲で
ある。この粒状物の粒径は、後のスクリーンにおける分
離を容易するような粒径であることが必要である。軽量
脱リン剤の製造方法としては、リン酸イオン吸着性微粒
子と軽量微粒子とを前記した割合で混合し、これに少量
の無機又は有機の結合剤、接着剤のような造粒剤を混合
し、造粒機を用いて前記した粒径範囲をもつ軽量脱リン
剤を製造する。造粒機としては各種の形式のものを用い
ることができる。この軽量脱リン剤は、リン酸イオン吸
着性微粒子がリン酸イオンを吸着するため、内部まで液
が侵入するようにある程度多孔質であるような構造をも
つことが好ましい。[0010] The particle size of the obtained lightweight dephosphorizing agent is 500
The range is from μm to 10 mm, preferably from 1 to 3 mm. It is necessary that the particle size of the granular material is a particle size that facilitates separation at a subsequent screen. As a method for producing a lightweight dephosphorizing agent, phosphate ion-adsorbing fine particles and lightweight fine particles are mixed in the ratio described above, and a small amount of an inorganic or organic binder and a granulating agent such as an adhesive are mixed. Then, a lightweight dephosphorizing agent having the above-mentioned particle size range is produced using a granulator. Various types of granulators can be used. It is preferable that this lightweight dephosphorizing agent has a structure in which the phosphate ion-adsorbing fine particles are somewhat porous so that the liquid penetrates into the interior because the phosphate ion-adsorbing fine particles adsorb phosphate ions.

【００１１】本発明の軽量脱リン剤を用いて行う本発明
の有機性汚水の生物処理とリン除去方法について、図１
を参照しながら説明する。本発明では、比重が０．９か
ら１．１と水の比重に近く、粒径が１〜３ｍｍ程度の軽
量粒状リン吸着剤が好適に使用されるが、これら軽量粒
状リン吸着剤は、前記した方法で製造したものである。
図１に示す本発明のリン除去方法の工程例では、軽量粒
状脱リン剤３は、汚水１を導入する曝気槽２（活性汚泥
処理槽）に投入すると、脱リン剤３は曝気槽２の底に沈
殿することなく曝気空気によって生起される水流に乗っ
て容易に槽内を懸濁流動する。この様にして軽量粒状リ
ン吸着剤３を用いて曝気槽２で汚水を活性汚泥法で生物
処理すると、汚水１のＢＯＤが生物により除去され、リ
ンが粒状リン吸着剤３により吸着除去される。前記の曝
気槽２の流出端にはスクリーン４が設けられて、粒状リ
ン吸着剤３の移動が阻止されており、活性汚泥５の粒子
のみが沈殿槽６に流入して行き、沈殿し、リン、ＢＯ
Ｄ，ＳＳが除去された清澄な処理水７が得られる。沈殿
槽６で沈殿した汚泥は大部分が返送汚泥１１として曝気
槽２に返送され、その一部が余剰汚泥１２として系外に
排出される。FIG. 1 shows the biological treatment and phosphorus removal method of the organic wastewater of the present invention using the lightweight phosphorus removing agent of the present invention.
This will be described with reference to FIG. In the present invention, a lightweight granular phosphorus adsorbent having a specific gravity of 0.9 to 1.1, which is close to the specific gravity of water, and having a particle size of about 1 to 3 mm is preferably used. It was manufactured by the following method.
In the example of the process of the phosphorus removal method of the present invention shown in FIG. 1, when the lightweight granular dephosphorizing agent 3 is put into the aeration tank 2 (activated sludge treatment tank) into which the wastewater 1 is introduced, the dephosphorizing agent 3 is removed from the aeration tank 2. The suspension flows easily in the tank on the water flow generated by the aerated air without settling at the bottom. When the wastewater is biologically treated by the activated sludge method in the aeration tank 2 using the lightweight granular phosphorus adsorbent 3 in this manner, the BOD of the wastewater 1 is removed by living organisms, and the phosphorus is adsorbed and removed by the granular phosphorus adsorbent 3. A screen 4 is provided at the outflow end of the aeration tank 2 to prevent the movement of the particulate phosphorus adsorbent 3, and only the particles of the activated sludge 5 flow into the precipitation tank 6, settle, and , BO
Clear treated water 7 from which D and SS have been removed is obtained. Most of the sludge settled in the settling tank 6 is returned to the aeration tank 2 as returned sludge 11, and part of the sludge is discharged out of the system as surplus sludge 12.

【００１２】このような状態で、汚水処理の運転を続け
ると、脱リン剤３のリン吸着量が限界に達し、処理水７
のリン含有量が悪化してしまうので、汚水処理の運転を
続けながら、継続的に所定量の脱リン剤３を末端部から
活性汚泥５と一緒に引き抜き、スクリーン分離部８に供
給し、粒状脱リン剤３と活性汚泥５を分級する。分級さ
れた活性汚泥５は曝気槽２に返送し、粒状脱リン剤３は
再生工程９に供給される。再生された脱リン剤１３は再
び曝気槽２に投入されリンの吸着・除去に寄与する。再
生方法は、簡単であり、脱リン剤３を苛性ソーダ水溶液
と接触させることによって、吸着されたリンが脱着され
る。脱着したリン含有液にカルシウムを添加すると、リ
ン鉱石と類似組成の燐酸カルシウムを含む回収リン１０
として沈殿するので、これをリン資源として利用する。
なお、スラリーから粒状脱リン剤３と活性汚泥５を分級
するためのスクリーン分離部８は、曝気槽２内に設ける
ようにすることもできる。If the operation of the sewage treatment is continued in such a state, the amount of phosphorus absorbed by the dephosphorizing agent 3 reaches a limit, and the treated water 7
Since the phosphorus content of the wastewater deteriorates, a predetermined amount of the dephosphorizing agent 3 is continuously pulled out from the end portion together with the activated sludge 5 while continuing the operation of the sewage treatment, and supplied to the screen separation unit 8 to remove the granular material. The dephosphorizing agent 3 and the activated sludge 5 are classified. The classified activated sludge 5 is returned to the aeration tank 2, and the granular dephosphorizing agent 3 is supplied to a regeneration step 9. The regenerated phosphorus removing agent 13 is again introduced into the aeration tank 2 and contributes to the adsorption and removal of phosphorus. The regeneration method is simple, and the adsorbed phosphorus is desorbed by bringing the dephosphorizing agent 3 into contact with an aqueous solution of caustic soda. When calcium is added to the desorbed phosphorus-containing solution, the recovered phosphorus containing calcium phosphate and a calcium phosphate having a similar composition is obtained.
This is used as phosphorus resources.
The screen separator 8 for classifying the granular dephosphorizing agent 3 and the activated sludge 5 from the slurry may be provided in the aeration tank 2.

【００１３】以上の本発明の構成により、次のような作
用・効果が生じる。 活性汚泥とリン吸着剤が、簡単に分級でき、リン吸着
剤が系外に流出しないため、凝集剤添加活性汚泥法にお
けるような凝集汚泥がまったく発生しない。 リンを資源として回収できる。 粒状リン吸着剤が、軽量で、比重が１に近いので、曝
気槽の曝気空気によって容易に懸濁流動し、曝気槽の底
に沈積してしまうというトラブルが起きない。従来の活
性アルミナなどの粒状リン吸着剤は、その比重は２．６
と大きく、曝気槽に投入するとたちまち沈積してしまう
欠点を有する。With the configuration of the present invention described above, the following operations and effects are produced. The activated sludge and the phosphorus adsorbent can be easily classified, and the phosphorus adsorbent does not flow out of the system, so that no coagulated sludge is generated as in the coagulant-added activated sludge method. Phosphorus can be recovered as a resource. Since the particulate phosphorus adsorbent is lightweight and has a specific gravity close to 1, there is no trouble that the particulate phosphorus adsorbent is easily suspended and flowed by the aerated air in the aeration tank and settles on the bottom of the aeration tank. A conventional granular adsorbent such as activated alumina has a specific gravity of 2.6.
It has the drawback that when it is put into an aeration tank, it is deposited immediately.

【００１４】投入された粒状リン吸着剤の表面に硝化
菌等の微生物が付着し、生物処理の効果が向上する。す
なわち、粒状リン吸着剤は、リン吸着機能のみでなく、
微生物固定化担体としても機能する。 粒状リン吸着剤と汚水の接触時間が、汚水の曝気槽滞
在時間と同じであり、非常に長くでき、ＳＶとして０．
１〜０．２（リットル／ｈ）と非常に小さく設定できる
ため、粒状リン吸着剤のリン吸着容量をほぼ完全に利用
できる。従来の吸着塔方式では、設置面積、建設コスト
の低減のため、ＳＶは３〜５（リットル／ｈ）程度と非
常に大きくせざるを得ないので、粒状リン吸着剤のリン
吸着容量を完全に利用できないという無駄がある。Microorganisms such as nitrifying bacteria adhere to the surface of the added granular phosphorus adsorbent, and the effect of biological treatment is improved. That is, the particulate phosphorus adsorbent has not only a phosphorus adsorption function,
It also functions as a carrier for immobilizing microorganisms. The contact time between the particulate phosphorus adsorbent and the sewage is the same as the stay time of the sewage in the aeration tank, and can be extremely long.
Since it can be set as very small as 1 to 0.2 (liter / h), the phosphorus adsorption capacity of the granular phosphorus adsorbent can be used almost completely. In the conventional adsorption tower method, the SV has to be very large, about 3 to 5 (liter / h) in order to reduce the installation area and the construction cost. Therefore, the phosphorus adsorption capacity of the particulate phosphorus adsorbent is completely reduced. There is a waste that it cannot be used.

【００１５】また、他の実施態様として、粉末活性炭と
シラスガラスマイクロバルーンを混合して造粒すること
により、軽量で曝気により簡単に流動する粒状活性炭を
製造し、これを曝気槽に添加すれば、生物分解できない
ＣＯＤ成分を吸着・除去でき、リン、難生物分解性ＣＯ
Ｄの両者が除去できる。この場合は図１の曝気槽２の中
間部にもスクリーン４を設置し、前段に軽量粒状リン吸
着剤１を投入し、後段には軽量粒状活性炭を投入する。
後段の粒状活性炭は、曝気槽から一部を引き抜いて活性
炭再生炉に供給して再生し、再生活性炭を再び曝気槽に
投入するようにすれば良い。In another embodiment, powdered activated carbon and shirasu glass microballoons are mixed and granulated to produce a lightweight activated carbon which flows easily by aeration and is added to an aeration tank. Adsorbs and removes COD components that cannot be biodegraded.
Both of D can be removed. In this case, the screen 4 is also installed in the middle part of the aeration tank 2 in FIG. 1, and the light-weight granular phosphorus adsorbent 1 is put in the first stage, and the light-weight granular activated carbon is put in the second stage.
A part of the granular activated carbon in the latter stage may be withdrawn from the aeration tank and supplied to an activated carbon regeneration furnace to be regenerated, and the regenerated activated carbon may be charged into the aeration tank again.

【００１６】[0016]

【実施例】以下に、本発明の理解を深めるために具体的
実施例を示すが、本発明は以下に示す具体的実施例によ
って限定されないことはいうまでもない。 実施例１ （１）軽量粒状リン吸着剤の製造 粉末活性アルミナとシラスガラスマイクロバルーンとセ
メントを造粒物の比重（造粒物製品を水中に浸漬した時
の比重）０．９５〜１．０５になるような比率で混合
し、ポリビニルアルコール水溶液を添加して、造粒して
から乾燥させ、粒径２〜３ｍｍの軽量粒状リン吸着剤を
製造した。 （２）下水処理への適用 前記軽量粒状リン吸着剤を下水処理の活性汚泥処理槽
（１００リットル）に、容積あたり３０％容積添加し、
曝気したところ、容易に懸濁流動し、曝気槽の底に沈む
ことはなかった。粒状リン吸着剤と活性汚泥の分級に
は、目開き１ｍｍのウエツジワイヤースクリーンを用い
たところ、容易に活性汚泥がスクリーン下に流出し、粒
状リン吸着剤が簡単に分離できた。下水処理実験装置の
仕様を以下の第１表に示す。EXAMPLES Specific examples will be shown below for better understanding of the present invention, but it is needless to say that the present invention is not limited by the following specific examples. Example 1 (1) Production of Light-weight Granular Phosphorus Adsorbent Powdered activated alumina, shirasu glass microballoon, and cement have specific gravity of granulated material (specific gravity of granulated product immersed in water) 0.95 to 1.05. , A polyvinyl alcohol aqueous solution was added, and the mixture was granulated and dried to produce a lightweight particulate phosphorus adsorbent having a particle size of 2 to 3 mm. (2) Application to sewage treatment The light-weight granular phosphorus adsorbent is added to an activated sludge treatment tank (100 liters) of sewage treatment by 30% by volume,
Upon aeration, the suspension readily flowed and did not sink to the bottom of the aeration tank. When the granular phosphorus adsorbent and the activated sludge were classified using a wedge wire screen having an opening of 1 mm, the activated sludge easily flowed below the screen, and the granular phosphorus adsorbent could be easily separated. The specifications of the sewage treatment experimental device are shown in Table 1 below.

【００１７】[0017]

【表１】 [Table 1]

【００１８】次に、曝気槽から粒状リン吸着剤を一日あ
たり１００ｃｃ引き抜き、カラムに充填し、１％苛性ソ
ーダ水溶液をＳＶ２で１時間通水して再生し、再生され
たリン吸着剤を曝気槽に戻した。このような運転を６ヶ
月間続け、平均処理水の水質を測定したところ、第２表
の「本発明の処理水」の欄に示すとおりの結果であっ
た。Next, 100 cc of the particulate phosphorus adsorbent is withdrawn from the aeration tank per day, packed in a column, and regenerated by passing a 1% aqueous solution of caustic soda through SV2 for one hour. Back to. When such an operation was continued for 6 months and the average quality of treated water was measured, the results were as shown in the column of "treated water of the present invention" in Table 2.

【００１９】比較例１ 実施例１において、粒状リン吸着剤を添加しない以外
は、同一条件として平行実験を行った結果、処理水の水
質の平均値は前記第２表の「比較例処理水」の欄に示す
通りであった。第２表の結果からみて、比較例１の場合
は、本発明の実施例１の場合と比較して、リンの値が著
しく高く、またアンモニア性窒素の値も高いことが明ら
かである。本発明の処理水でアンモニア性窒素の値が低
いのは、粒状リン吸着剤の表面に硝化菌が固定化され
（顕微鏡観察で確認した）、硝化反応が良く進んだため
であるとみられる。Comparative Example 1 A parallel experiment was conducted under the same conditions as in Example 1 except that no particulate phosphorus adsorbent was added. As a result, the average value of the quality of the treated water was as shown in Table 2 above. Column. From the results shown in Table 2, it is clear that Comparative Example 1 has a significantly higher phosphorus value and a higher ammoniacal nitrogen value than Example 1 of the present invention. The low value of ammoniacal nitrogen in the treated water of the present invention is presumably because nitrification bacteria were immobilized on the surface of the particulate phosphorus adsorbent (confirmed by microscopic observation) and the nitrification reaction proceeded well.

【００２０】[0020]

【表２】 [Table 2]

【００２１】[0021]

【発明の効果】本発明の軽量脱リン剤を用いた有機性汚
水の生物処理方法により以下に示すような効果が得られ
る。 （１）曝気槽において軽量脱リン剤を曝気空気によって
懸濁流動させながら、生物処理とリン吸着処理を同時に
進行させることができる。この処理に際して、本発明の
軽量脱リン剤はその比重が１に近いので、処理のＳＶを
０．１〜０．２と非常に小さく設定できるので、脱リン
剤としての機能を最大限に活用できる。 （２）本発明の有機性汚水の生物処理方法では難脱水性
の凝集汚泥は全く発生しない。また、本発明の軽量脱リ
ン剤を用いたリン除去法では、リンを資源として回収で
きる。 （３）軽量活性炭を併用することにより、生物処理、リ
ン吸着処理と同時に難生物分解性ＣＯＤも同時に処理す
ることができる。 （４) さらにまた、本発明の有機性汚水の生物処理方法
では、軽量脱リン剤は微生物固定化担体としても機能す
るので、有機性汚水の硝化脱窒素処理も促進される。 （５）吸着能が低下した脱リン剤は、苛性ソーダ水溶液
に接触させることによって吸着したリンが脱リン剤から
脱着されるので、簡単に再生することができる。The following effects can be obtained by the biological treatment method of organic sewage using the lightweight phosphorus removing agent of the present invention. (1) The biological treatment and the phosphorus adsorption treatment can simultaneously proceed while suspending and flowing the lightweight dephosphorizing agent in the aeration tank with the aerated air. In this treatment, the specific gravity of the lightweight dephosphorizing agent of the present invention is close to 1, so that the SV of the treatment can be set to a very small value of 0.1 to 0.2. it can. (2) In the biological treatment method of the organic wastewater of the present invention, hardly dewaterable flocculated sludge is not generated at all. In the method for removing phosphorus using the lightweight phosphorus removing agent of the present invention, phosphorus can be recovered as a resource. (3) By using lightweight activated carbon in combination, it is possible to simultaneously treat biodegradable COD simultaneously with biological treatment and phosphorus adsorption treatment. (4) Furthermore, in the biological treatment method for organic wastewater of the present invention, the lightweight dephosphorizing agent also functions as a microorganism-immobilizing carrier, so that the nitrification and denitrification treatment of organic wastewater is promoted. (5) The dephosphorizing agent having reduced adsorption ability can be easily regenerated because the adsorbed phosphorus is desorbed from the dephosphorizing agent by contact with an aqueous caustic soda solution.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の軽量脱リン剤を用いた有機性汚水の生
物処理工程のフローの１例を示す説明図である。FIG. 1 is an explanatory diagram showing an example of a flow of a biological treatment process of an organic wastewater using the lightweight phosphorus removing agent of the present invention.

【符号の説明】[Explanation of symbols]

１ 汚水 ２ 曝気槽 ３ 軽量脱リン剤 ４ スクリーン ５ 活性汚泥 ６ 沈殿槽 ７ 処理水 ８ スクリーン分離部 ９ 再生工程 １０ 回収リン １１ 返送汚泥 １２ 余剰汚泥 １３ 再生脱リン剤 DESCRIPTION OF SYMBOLS 1 Sewage 2 Aeration tank 3 Light phosphorus removal agent 4 Screen 5 Activated sludge 6 Sedimentation tank 7 Treated water 8 Screen separation part 9 Regeneration process 10 Recovery phosphorus 11 Returned sludge 12 Excess sludge 13 Regeneration phosphorus removal agent

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 リン酸イオン吸着性を有する微粒子と軽
量微粒子とを混合し、比重が１に近い粒子に造粒して、
水中における曝気により容易に流動する性質の粒状物に
成形されていることを特徴とする軽量脱リン剤。1. Mixing fine particles having a phosphate ion-adsorbing property and lightweight fine particles, and granulating them into particles having a specific gravity close to 1;
A lightweight dephosphorizing agent characterized by being formed into a granular material having a property of flowing easily by aeration in water. 【請求項２】 前記リン酸イオン吸着性を有する微粒子
が活性アルミナ、水酸化アルミニウム、酸化鉄、水酸化
鉄、酸化チタン、酸化ジルコニウムの少なくとも１種か
らなるものであることを特徴とする請求項１に記載の軽
量脱リン剤。2. The method according to claim 1, wherein the fine particles having a phosphate ion-adsorbing property are made of at least one of activated alumina, aluminum hydroxide, iron oxide, iron hydroxide, titanium oxide and zirconium oxide. 2. The lightweight dephosphorizing agent according to 1. 【請求項３】 前記軽量微粒子が、中空ガラス質球状粉
体、ガラス質粒子を含む無機質材料を焼成・発泡させて
得たマイクロバルーン、あるいは発泡プラスチック粉体
の少なくとも１種からなるものであることを特徴とする
請求項１に記載の軽量脱リン剤。3. The lightweight fine particles are made of at least one of hollow glassy spherical powder, microballoons obtained by baking and foaming an inorganic material containing glassy particles, and foamed plastic powder. The lightweight dephosphorizing agent according to claim 1, characterized in that: 【請求項４】 請求項１記載の軽量脱リン剤を、有機性
汚水を生物処理する曝気槽に投入し、生物処理とリン吸
着除去を同時に行うことを特徴とする有機性汚水のリン
除去方法。4. A method for removing phosphorus from organic wastewater, comprising introducing the lightweight dephosphorizing agent according to claim 1 into an aeration tank for biologically treating organic wastewater, and simultaneously performing biological treatment and phosphorus adsorption removal. . 【請求項５】 前記軽量脱リン剤を投入した前記曝気槽
の活性汚泥と前記軽量脱リン剤を含むスラリーをスクリ
ーンに通過させて、前記スラリーから軽量脱リン剤を分
離し、分離された軽量脱リン剤を再生した後、前記曝気
槽に再投入することを特徴とする請求項４記載の有機性
汚水のリン除去方法。5. The activated sludge in the aeration tank charged with the lightweight dephosphorizer and the slurry containing the lightweight dephosphorizer are passed through a screen to separate the lightweight dephosphorizer from the slurry. The method for removing phosphorus from organic wastewater according to claim 4, wherein the phosphorus removal agent is regenerated and then re-introduced into the aeration tank.
JP9035287A 1997-02-19 1997-02-19 Lightweight dephosphorizing agent and removing method of phosphorus in organic waste water using the same Pending JPH10230254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9035287A JPH10230254A (en) 1997-02-19 1997-02-19 Lightweight dephosphorizing agent and removing method of phosphorus in organic waste water using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9035287A JPH10230254A (en) 1997-02-19 1997-02-19 Lightweight dephosphorizing agent and removing method of phosphorus in organic waste water using the same

Publications (1)

Publication Number Publication Date
JPH10230254A true JPH10230254A (en) 1998-09-02

Family

ID=12437567

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JPH10230254A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005193078A (en) * 2003-12-26 2005-07-21 Mitsubishi Shoji Construction Materials Corp Phosphorus removing agent
JP2007319819A (en) * 2006-06-02 2007-12-13 Kansai Pgs Kk Phosphorus recovery method
JP2010149078A (en) * 2008-12-26 2010-07-08 Nagoya Institute Of Technology Phosphorus adsorbent and method for manufacturing the same
JP2011189288A (en) * 2010-03-15 2011-09-29 Toshiba Corp Phosphorus recovery device
US11796893B2 (en) 2019-05-05 2023-10-24 Huawei Technologies Co., Ltd. Compact camera module and terminal device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005193078A (en) * 2003-12-26 2005-07-21 Mitsubishi Shoji Construction Materials Corp Phosphorus removing agent
JP4565836B2 (en) * 2003-12-26 2010-10-20 三菱商事建材株式会社 Phosphorus remover
JP2007319819A (en) * 2006-06-02 2007-12-13 Kansai Pgs Kk Phosphorus recovery method
JP2010149078A (en) * 2008-12-26 2010-07-08 Nagoya Institute Of Technology Phosphorus adsorbent and method for manufacturing the same
JP2011189288A (en) * 2010-03-15 2011-09-29 Toshiba Corp Phosphorus recovery device
US11796893B2 (en) 2019-05-05 2023-10-24 Huawei Technologies Co., Ltd. Compact camera module and terminal device

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