JP3036281B2 - Treatment method of human wastewater - Google Patents
Treatment method of human wastewaterInfo
- Publication number
- JP3036281B2 JP3036281B2 JP5018626A JP1862693A JP3036281B2 JP 3036281 B2 JP3036281 B2 JP 3036281B2 JP 5018626 A JP5018626 A JP 5018626A JP 1862693 A JP1862693 A JP 1862693A JP 3036281 B2 JP3036281 B2 JP 3036281B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- denitrification
- human
- nitrification
- sludge
- 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.)
- Expired - Fee Related
Links
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Sludge (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はし尿系汚水の処理方法に
係り、特に、浄化槽汚泥を主とし、し尿が混合されてな
るし尿系汚水に無機凝集剤と高分子凝集剤とを添加して
脱水処理し、得られた脱水分離水を生物学的硝化・脱窒
処理する方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating human wastewater, and more particularly to a method for treating wastewater from a septic tank, in which an inorganic flocculant and a polymer flocculant are added to human wastewater mixed with human waste. The present invention relates to an improvement in a method for biologically nitrifying and denitrifying a dewatered separated water obtained by a dehydration treatment.
【０００２】[0002]
【従来の技術】従来、浄化槽汚泥とし尿等を混合処理す
る代表的な方法として、図２に示す標準脱窒素処理方式
と称される処理システムがある。2. Description of the Related Art Conventionally, as a typical method of mixing septic tank sludge and urine or the like, there is a treatment system called a standard denitrification treatment system shown in FIG.
【０００３】この方法は、前処理工程で夾雑物を除去し
たし尿や浄化槽汚泥を硝化・脱窒法によって処理するも
のであるが、この方法では、得られる処理水は５〜１０
倍に希釈されたものであっても、リンが少なくとも数十
ｍｇ／ｌ含まれているために、後工程で脱リン処理が必
要であるという欠点がある。[0003] In this method, human waste and septic tank sludge from which contaminants have been removed in a pretreatment step are treated by a nitrification / denitrification method.
Even if it is diluted twice, there is a drawback that a phosphorus removal treatment is required in a subsequent step since phosphorus is contained at least several tens mg / l.
【０００４】これに対して、図３に示す如く、浄化槽汚
泥やし尿に無機凝集剤とポリマーとを添加して脱水処理
し、得られる分離液ないし濾液を硝化・脱窒処理する方
法が提案されている。図３に示す方法では、、通常、数
千ｍｇ／ｌの無機凝集剤を添加するために、し尿や浄化
槽汚泥中のリンの９０％以上が除去され、後工程での脱
リンは不要となる。On the other hand, as shown in FIG. 3, a method has been proposed in which an inorganic flocculant and a polymer are added to a septic tank sludge or human waste to dehydrate and a resultant separated liquid or filtrate is subjected to nitrification and denitrification. ing. In the method shown in FIG. 3, 90% or more of phosphorus in human waste and septic tank sludge is usually removed because several thousand mg / l of an inorganic coagulant is added, and dephosphorization in a subsequent step becomes unnecessary. .
【０００５】[0005]
【発明が解決しようとする課題】しかし、図３に示す方
法では、無機凝集剤の添加によるリンの除去率をコント
ロールすることが困難であるために、分離液ないし濾液
中のリンがＢＯＤに対して不足することが多く、生物処
理工程では新たにリン化合物を補給しなければ栄養不足
となるという欠点がある。However, in the method shown in FIG. 3, it is difficult to control the phosphorus removal rate by adding an inorganic coagulant, so that phosphorus in the separated liquid or the filtrate is less than the BOD. There is a disadvantage that nutrient deficiency occurs unless a new phosphorus compound is replenished in the biological treatment process.
【０００６】本発明は上記従来の問題点を解決し、浄化
槽汚泥を主とし、し尿が混合されてなるし尿系汚水に無
機凝集剤及び高分子凝集剤を添加して脱水処理し、得ら
れた脱水分離水を生物学的硝化・脱窒工程にて処理する
方法において、生物学的硝化・脱窒工程におけるリンの
不足を有効に補って、効率的な処理を行なう方法を提供
することを目的とする。The present invention solves the above-mentioned conventional problems, and is obtained by adding an inorganic coagulant and a polymer coagulant to human wastewater mixed with night soil, mainly using a septic tank sludge, and performing a dehydration treatment. In a method of treating dewatered and separated water in a biological nitrification / denitrification step, an object of the present invention is to provide a method for effectively supplementing the lack of phosphorus in the biological nitrification / denitrification step and performing an efficient treatment. And
【０００７】[0007]
【課題を解決するための手段】本発明のし尿系汚水の処
理方法は、浄化槽汚泥を主とし、し尿が混合されてなる
し尿系汚水に無機凝集剤及び高分子凝集剤を添加して脱
水処理し、得られた脱水分離水を生物学的硝化・脱窒工
程にて処理する方法において、該生物学的硝化・脱窒工
程の流入水のＢＯＤ：Ｐの比が１００：１前後となるよ
うに、前記し尿系汚水の一部及び／又はし尿の一部を分
取して該生物学的硝化・脱窒工程に導入することを特徴
とする。The method of treating human wastewater according to the present invention mainly comprises a septic tank sludge, and a dewatering treatment by adding an inorganic coagulant and a polymer coagulant to human wastewater mixed with human waste. and a method of processing a dehydrating separated water obtained in the biological nitrification and denitrification processes, biological nitrification-denitrification
The BOD: P ratio of the influent is about 100: 1
As described above, a part of the human wastewater and / or a part of the human waste is fractionated and introduced into the biological nitrification / denitrification step.
【０００８】[0008]
【作用】本発明の方法においては、通常リンを２００ｍ
ｇ／ｌ以上含有するし尿又はし尿系汚水の一部を分取し
て、生物学的硝化・脱窒処理される水のＢＯＤ：Ｐの比
が１００：１前後となるように、生物学的硝化・脱窒工
程に導入するため、生物学的硝化・脱窒工程におけるリ
ンの不足量が補給され、このし尿又はし尿系汚水中のリ
ンを栄養源として、効率的な生物処理を行なうことが可
能とされる。In the method of the present invention, the phosphorus is usually 200 m
BOD: P ratio of water to be subjected to biological nitrification and denitrification by fractionating part of human waste or human wastewater containing g / l or more
Is introduced into the biological nitrification / denitrification process so that the ratio becomes about 100: 1, so that the insufficient amount of phosphorus in the biological nitrification / denitrification process is replenished. As a nutrient source, efficient biological treatment can be performed.
【０００９】[0009]
【実施例】以下、図面を参照して本発明を詳細に説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.
【００１０】図１は、本発明し尿系汚水の処理方法の一
実施例方法を説明する系統図である。図１において、
１、２は受入槽、３は前処理工程、４、５は貯留槽、６
は第１反応槽、７は第２反応層、８は脱水機、９は貯留
槽、１０は脱窒素槽、１１は硝化槽、１２は二次脱窒素
槽、１３は再曝気槽、１４は沈澱槽を示す。２１〜４４
の各符号は配管（３４はコンベア）を示す。Ａは生物学
的硝化・脱窒工程である。FIG. 1 is a system diagram illustrating an embodiment of a method for treating urine-based wastewater according to the present invention. In FIG.
1, 2 is a receiving tank, 3 is a pretreatment step, 4 and 5 are storage tanks, 6
Is a first reaction tank, 7 is a second reaction layer, 8 is a dehydrator, 9 is a storage tank, 10 is a denitrification tank, 11 is a nitrification tank, 12 is a secondary denitrification tank, 13 is a re-aeration tank, 14 is Shows a settling tank. 21-44
Indicates a pipe (34 is a conveyor). A is a biological nitrification / denitrification process.
【００１１】本実施例の方法は、し尿の一部を生物処理
での栄養源として分取し、残部のし尿と浄化槽汚泥とを
混合して無機凝集剤と高分子凝集剤とを添加して直接脱
水を行なった後、生物学的硝化・脱窒工程Ａで処理して
高水質生物処理水を得ようとするものである。In the method of this embodiment, a part of human waste is fractionated as a nutrient source in biological treatment, the remaining human waste and septic tank sludge are mixed, and an inorganic coagulant and a polymer coagulant are added. After direct dehydration, it is treated in biological nitrification / denitrification step A to obtain high quality biologically treated water.
【００１２】即ち、まず、し尿は、配管２１、受入槽
１、配管２３を経て前処理工程３で夾雑物が除去された
後、配管２５より貯留槽４に貯留される。一方、浄化槽
汚泥も配管２２、受入槽２、配管２４を経て前処理工程
３で夾雑物が除去された後、配管２６より貯留槽５に貯
留される。That is, first, human waste passes through the pipe 21, the receiving tank 1, and the pipe 23, and after impurities are removed in the pretreatment step 3, is stored in the storage tank 4 through the pipe 25. On the other hand, the septic tank sludge is also stored in the storage tank 5 through the pipe 26 after the impurities are removed in the pretreatment step 3 through the pipe 22, the receiving tank 2, and the pipe 24.
【００１３】貯留槽４のし尿の一部はリンの栄養源とし
て、配管２８より後述の生物学的硝化・脱窒工程Ａの原
水貯留槽９に送給する一方、残部は配管２７より浄化槽
汚泥貯留槽５に送給して混合される。なお、この貯留槽
５には、後述の生物学的硝化・脱窒工程Ａで発生する余
剰汚泥を混合しても良い。A portion of the night soil in the storage tank 4 is fed as a nutrient of phosphorus from a pipe 28 to a raw water storage tank 9 in a biological nitrification / denitrification step A described later, while the remainder is supplied from a pipe 27 to a septic tank sludge. It is fed to the storage tank 5 and mixed. The storage tank 5 may be mixed with excess sludge generated in a biological nitrification / denitrification step A described later.
【００１４】貯留槽５において、前処理を施した浄化槽
汚泥及びし尿、更に必要に応じて生物学的硝化・脱窒工
程の余剰汚泥が混合されたし尿系汚水は、配管２９よ
り、まず第１反応槽６に導入され、配管３０より無機凝
集剤が添加される。無機凝集剤の添加により、し尿系汚
水が改質されると共に、浄化槽汚泥やし尿に含まれるリ
ンや高分子有機物などが不溶化される。次いで、第１反
応槽の液を配管３１より第２反応槽７に導き、配管３２
より高分子凝集剤を添加して強固なフロックを形成させ
る。第２反応槽７において、フロック化ないし造粒化さ
れた液は配管３３より脱水機８に供給して脱水処理す
る。この脱水処理に当り、第２反応槽７からの被脱水処
理液中には、強固なフロックが形成されていること、浄
化槽汚泥やし尿中には繊維分が多く含まれること等か
ら、低含水率の脱水ケーキを得ることができる。得られ
た脱水ケーキはコンベア３４より系外へ排出され、一
方、脱水分離水（濾液）は配管３５より貯留槽９に導入
される。In the storage tank 5, the pre-treated septic tank sludge and night soil and, if necessary, the excess human sludge from the biological nitrification and denitrification step are mixed, and the night soil is first discharged from a pipe 29 through a first pipe. It is introduced into the reaction tank 6 and an inorganic coagulant is added from the pipe 30. The addition of the inorganic coagulant modifies the human wastewater and insolubilizes phosphorus and high molecular organic substances contained in the septic tank sludge and human waste. Next, the liquid in the first reaction tank is led from the pipe 31 to the second reaction tank 7,
A stronger floc is formed by adding a polymer flocculant. In the second reaction tank 7, the flocculed or granulated liquid is supplied from a pipe 33 to a dehydrator 8 to be dehydrated. In the dehydration treatment, the liquid to be dehydrated from the second reaction tank 7 has low water content because strong flocs are formed, and the septic tank sludge and human waste contain a large amount of fiber. Rate of dewatered cake can be obtained. The obtained dewatered cake is discharged out of the system from the conveyor 34, while dewatered separated water (filtrate) is introduced into the storage tank 9 from the pipe 35.
【００１５】このように、無機凝集剤と高分子凝集剤と
を併用した脱水方法により、し尿系汚水中のＢＯＤは全
体の５０〜７０％が除去され、脱水分離水中には、生物
処理が容易な低分子のＢＯＤが１０００〜３０００ｍｇ
／ｌ程度残留するのみとなる。これに対してリンは９０
％以上が除去され、５ｍｇ／ｌ以下となることも多い。
このため、脱水分離水を単独で生物処理するにはＢＯＤ
に対してリンが０．５％以下となり、栄養不足となる
（通常はＢＯＤの約１％のリンが生物処理では必要とさ
れる。）。As described above, by the dehydration method using the inorganic coagulant and the polymer coagulant together, 50-70% of the BOD in the human wastewater is removed, and the biological treatment is easy in the dewatered and separated water. Low molecular BOD is 1000-3000mg
/ L only remains. Rin is 90
% Or more is removed and often becomes 5 mg / l or less.
For this reason, BOD is required for biological treatment of dewatered and separated water alone.
Is less than 0.5%, resulting in nutrient deficiency (usually about 1% of BOD phosphorus is required for biological treatment).
【００１６】本発明においては、このリンの不足分を補
給するために、通常２００ｍｇ／ｌ以上のリンを含むし
尿（無機凝集剤添加前のし尿）の一部を、生物処理のリ
ンの栄養源として配管２８より貯留槽９に導入し、脱水
分離水と共に生物学的硝化・脱窒工程Ａに提供する。In the present invention, in order to replenish the phosphorus deficiency, a part of human waste (usage before adding an inorganic coagulant) which usually contains 200 mg / l or more of phosphorus is replaced with a biologically treated phosphorus nutrient source. To the storage tank 9 from the pipe 28, and provide it to the biological nitrification / denitrification step A together with the dewatered and separated water.
【００１７】貯留槽９内の脱水分離水とし尿との混合液
は、配管３６を経て生物学的硝化・脱窒工程Ａに供給さ
れ、脱窒素槽１０、配管３７、硝化槽１１、二次脱窒素
槽１２、配管４０、再曝気槽１３、配管４１、沈澱槽１
４を経て処理され、沈澱槽１４の上澄水は生物処理水と
して配管４２より系外へ排出される。一方、分離汚泥の
一部は配管４３より返送汚泥として脱窒素槽１０に返送
され、残部は余剰汚泥として配管４４より系外へ配出さ
れる。なお、硝化槽１１の処理液の一部は循環液として
配管３８より脱窒素槽１０に返送される。The mixed solution of the dewatered separated water and urine in the storage tank 9 is supplied to the biological nitrification / denitrification step A via the pipe 36, and the denitrification tank 10, the pipe 37, the nitrification tank 11, Denitrification tank 12, pipe 40, re-aeration tank 13, pipe 41, precipitation tank 1
4 and the supernatant water of the sedimentation tank 14 is discharged out of the system through a pipe 42 as biologically treated water. On the other hand, a part of the separated sludge is returned to the denitrification tank 10 as return sludge from the pipe 43, and the remainder is discharged outside the system from the pipe 44 as excess sludge. A part of the processing liquid in the nitrification tank 11 is returned to the denitrification tank 10 from the pipe 38 as a circulating liquid.
【００１８】このように脱水分離水をし尿の一部と共に
生物学的硝化・脱窒処理することにより、ＢＯＤのみな
らず、窒素やリンも高度に除去された生物処理水を得る
ことができる。By subjecting the dehydrated and separated water to biological nitrification and denitrification together with part of the urine, biologically treated water from which not only BOD but also nitrogen and phosphorus are highly removed can be obtained.
【００１９】本発明において、除渣した浄化槽汚泥とし
尿との混合割合は、通常の場合、重量比で浄化槽汚泥：
し尿＝１０：０〜７：３の浄化槽汚泥過剰比率とするの
が好ましい。また、浄化槽汚泥及びし尿に更に生物学的
硝化・脱窒工程から排出される余剰汚泥を混合する場合
には、混合割合は、重量比で浄化槽汚泥：し尿：余剰汚
泥＝１０：０：２〜７：３：２とするのが好ましい。In the present invention, the mixing ratio of the septic tank sludge that has been removed and urine is usually the weight ratio of the septic tank sludge:
It is preferable to use a septic tank sludge excess ratio of night soil = 10: 0 to 7: 3. When excess sludge discharged from the biological nitrification / denitrification step is further mixed with septic tank sludge and night soil, the mixing ratio is septic tank sludge: night soil: excess sludge = 10: 0: 2 by weight ratio. The ratio is preferably 7: 3: 2.
【００２０】浄化槽汚泥、し尿及び必要に応じて上記余
剰汚泥を混合したし尿系汚水に添加する無機凝集剤とし
ては、塩化第二鉄、ポリ硫酸鉄等を用いることができ、
その添加量はし尿系汚水に対して塩化第二鉄（３８％水
溶液）の場合で２０００〜４０００ｍｇ／ｌ程度とする
のが好ましい。一方、高分子凝集剤としては、両性ポリ
マーが最適であるが、カチオンポリマーなど他の種類の
ポリマーを使用することもできる。両性ポリマーを用い
た場合には、図１における第２反応槽７を造粒濃縮槽と
して汚泥の造粒及び濃縮を行なうことができ、この場合
は、後工程の脱水機の脱水能力を大きくとれるという利
点もある。As the inorganic coagulant added to the septic tank sludge, night soil and, if necessary, the above-mentioned excess sludge and added to the urine-based wastewater, ferric chloride, polyiron sulfate and the like can be used.
It is preferable to add about 2000 to 4000 mg / l of ferric chloride (38% aqueous solution) with respect to human wastewater. On the other hand, an amphoteric polymer is optimal as the polymer flocculant, but other types of polymers such as a cationic polymer can also be used. When an amphoteric polymer is used, sludge can be granulated and concentrated using the second reaction tank 7 in FIG. 1 as a granulation and concentration tank, and in this case, the dewatering capacity of the post-process dewatering machine can be increased. There is also an advantage.
【００２１】本発明において好適な両性ポリマーとして
は、通常、１分子中に、（Ａ）カチオン性構成単位、
（Ｂ）アニオン性構成単位及び場合により（Ｃ）ノニオ
ン性構成単位を含有する共重合体から成るものが用いら
れる。As the amphoteric polymer suitable in the present invention, (A) a cationic structural unit,
What consists of a copolymer containing (B) an anionic constitutional unit and optionally (C) a nonionic constitutional unit is used.
【００２２】該（Ａ）カチオン性構成単位を形成するカ
チオン性モノマーとしては、例えばジメチルアミノメチ
ルアクリレート又はメタクリレート、ジメチルアミノエ
チルアクリレート又はメタクリレート、ジメチルアミノ
プロピルアクリレート又はメタクリレート、ジメチルア
ミノ−２−ヒドロキシプロピルアクリレート又はメタク
リレート、ジエチルアミノメチルアクリレート又はメタ
クリレート、ジエチルアミノエチルアクリレート又はメ
タクリレート、ジエチルアミノプロピルアクリレート又
はメタクリレート、ジエチルアミノ−２−ヒドロキシア
クリレート又はメタクリレート、ジメチルアミノメチル
アクリルアミド又はメタクリルアミド、ジメチルアミノ
エチルアクリルアミド又はメタクリルアミド、ジメチル
アミノプロピルアクリルアミド又はメタクリルアミド、
ジメチルアミノ−２−ヒドロキシプロピルアクリルアミ
ド又はメタクリルアミド、ジエチルアミノメチルアクリ
ルアミド又はメタクリルアミド、ジエチルアミノエチル
アクリルアミド又はメタクリルアミド、ジエチルアミノ
プロピルアクリルアミド又はメタクリルアミド、ジエチ
ルアミノ−２−ヒドロキシプロピルアクリルアミド又は
メタクリルアミドなどの第三級塩や四級化物などが挙げ
られる。第三級塩に用いられる酸としては、例えば塩
酸、硫酸、硝酸、ギ酸、酢酸などが挙げられ、一方、四
級化剤としては、例えば塩化メチル、ヨウ化メチル、塩
化ベンジル、ジメチル硫酸、ジエチル硫酸、塩化エチ
ル、ヨウ化エチルなどが挙げられる。前記カチオン性モ
ノマーは１種用いてもよいし、２種以上を組み合わせて
用いてもよい。Examples of the (A) cationic monomer forming the cationic structural unit include dimethylaminomethyl acrylate or methacrylate, dimethylaminoethyl acrylate or methacrylate, dimethylaminopropyl acrylate or methacrylate, dimethylamino-2-hydroxypropyl acrylate. Or methacrylate, diethylaminomethyl acrylate or methacrylate, diethylaminoethyl acrylate or methacrylate, diethylaminopropyl acrylate or methacrylate, diethylamino-2-hydroxyacrylate or methacrylate, dimethylaminomethylacrylamide or methacrylamide, dimethylaminoethylacrylamide or methacrylamide, dimethylaminopropyl alcohol Riruamido or methacrylamide,
Tertiary salts such as dimethylamino-2-hydroxypropylacrylamide or methacrylamide, diethylaminomethylacrylamide or methacrylamide, diethylaminoethylacrylamide or methacrylamide, diethylaminopropylacrylamide or methacrylamide, diethylamino-2-hydroxypropylacrylamide or methacrylamide, And quaternary compounds. Acids used for the tertiary salt include, for example, hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid and the like, while quaternizing agents include, for example, methyl chloride, methyl iodide, benzyl chloride, dimethyl sulfate, diethyl sulfate Sulfuric acid, ethyl chloride, ethyl iodide and the like. The cationic monomer may be used alone, or two or more kinds may be used in combination.
【００２３】また、（Ｂ）アニオン性構成単位を形成す
るアニオン性ポリマーとしては、例えばアクリル酸、メ
タクリル酸、エタクリル酸など不飽和カルボン酸及びそ
れらのナトリウム塩、カリウム塩、アンモニウム塩、更
にはビニルスルホン酸、２−アクリルアミド−２−メチ
ルプロパンスルホン酸及びそのナトリウム塩、カリウム
塩、アンモニウム塩などが挙げられる。これらのアニオ
ン性ポリマーは１種用いてもよいし、２種以上を組み合
わせて用いてもよい。The (B) anionic polymer forming the anionic constitutional unit includes, for example, unsaturated carboxylic acids such as acrylic acid, methacrylic acid and ethacrylic acid and their sodium, potassium, ammonium and vinyl salts. Sulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid and its sodium salt, potassium salt, ammonium salt and the like can be mentioned. One of these anionic polymers may be used, or two or more may be used in combination.
【００２４】更に、場合により導入される（Ｃ）ノニオ
ン性構成単位を形成するモノマーとしては、例えばアク
リルアミド、メタクリルアミド、ジメチルアクリルアミ
ド、ジメチルメタクリルアミドなどのビニル基含有アミ
ド類、アクリロニトリルやメタクリロニトリルなどのシ
アン化ビニル系化合物、アクリル酸メチル、アクリル酸
エチル、メタクリル酸メチル、メタクリル酸エチルなど
の（メタ）アクリル酸のアルキルエステル類、酢酸ビニ
ルなどのカルボン酸のビニルエステル類、スチレン、α
−メチルスチレン、ｐ−メチルスチレンなどの芳香族ビ
ニル化合物などが挙げられる。これらのモノマーは１種
用いてもよいし、２種以上を組み合わせて用いてもよ
い。Further, the monomer which forms the nonionic structural unit (C) optionally introduced includes, for example, vinyl group-containing amides such as acrylamide, methacrylamide, dimethylacrylamide and dimethylmethacrylamide, acrylonitrile and methacrylonitrile. Vinyl cyanide compounds, alkyl (meth) acrylates such as methyl acrylate, ethyl acrylate, methyl methacrylate and ethyl methacrylate, vinyl carboxylate such as vinyl acetate, styrene, α
And aromatic vinyl compounds such as -methylstyrene and p-methylstyrene. One of these monomers may be used, or two or more thereof may be used in combination.
【００２５】このような両性ポリマーの添加量は通常の
場合、被処理液中の固形物に対して０．５〜２．０重量
％程度とされる。The amount of the amphoteric polymer to be added is usually about 0.5 to 2.0% by weight based on the solids in the liquid to be treated.
【００２６】図１に示す、実施例では、し尿の一部を脱
水分離水に混合して生物学的硝化・脱窒工程に送給する
が、し尿の代りに、浄化槽汚泥とし尿とを混合してなる
し尿系汚水の一部を分取して生物学的硝化・脱窒工程に
送給しても良い。しかしながら、リン補給源としては、
リン含有量が多く、ＳＳ含有量が少ないし尿を用いるの
が好適である。In the embodiment shown in FIG. 1, part of human waste is mixed with dehydrated and separated water and sent to the biological nitrification / denitrification step. Instead of human waste, septic tank sludge and urine are mixed. A part of the human urine sewage may be collected and sent to the biological nitrification / denitrification step. However, phosphorus sources are:
It is preferable to use human urine having a high phosphorus content and a low SS content.
【００２７】また、し尿は脱水分離水の貯留槽に導入
し、脱水分離水と混合して生物学的硝化・脱窒工程に供
給する他、直接生物学的硝化・脱窒工程に供給すること
もできる。Further, human waste is introduced into a storage tank for dewatered and separated water, mixed with the dewatered and separated water, and supplied to the biological nitrification / denitrification step, or directly supplied to the biological nitrification / denitrification step. Can also.
【００２８】なお、し尿又はし尿系汚水の一部を分取し
て生物学的硝化・脱窒工程に送給する割合は、脱水分離
水の性状によっても異なるが、通常、し尿の一部を分取
して生物学的硝化・脱窒工程に送給する場合には、し尿
の割合は、ＢＯＤ：Ｐの比が１００：１前後となるよう
に、脱水分離水に対して３〜１０体積％とするのが好ま
しい。The rate at which part of human waste or human wastewater is fractionated and sent to the biological nitrification / denitrification step varies depending on the properties of the dewatered and separated water. When fractionated and sent to the biological nitrification / denitrification process, the ratio of human waste should be such that the ratio of BOD: P is around 100: 1.
To, preferably 3 to 10% by volume based on the de-water separation water.
【００２９】以下に具体的な実験例を挙げて、本発明を
より詳細に説明する。Hereinafter, the present invention will be described in more detail with reference to specific experimental examples.
【００３０】実験例１ 浄化槽汚泥、し尿及び硝化・脱窒処理工程の余剰汚泥を
２：１：１（重量比）の割合で混合した下記性状の汚泥
（原泥）に、塩化第二鉄（３８％水溶液）を３０００ｍ
ｇ／ｌ添加すると共に、両性ポリマーを１３０ｍｇ／ｌ
添加して調質・造粒し、ベルトプレス脱水機による脱水
を行なった。なお、両性ポリマーとしてはジメチルアミ
ノエチルアクリレート，アクリルアミド，アクリル酸か
らなるコポリマーを用いた。原泥性状 ＳＳ：１０５００ｍｇ／ｌ ＢＯＤ：３７００ｍｇ／ｌ ＣＯＤ：３７００ｍｇ／ｌ Ｔ−Ｎ：８１０ｍｇ／ｌ ＰＯ4 −Ｐ：１４０ｍｇ／ｌ その結果、含水率７３．２％と低含水率の脱水ケーキが
得られた。EXPERIMENTAL EXAMPLE 1 Septic tank sludge, night soil, and excess sludge from the nitrification / denitrification treatment step were mixed at a ratio of 2: 1: 1 (weight ratio) to ferrous chloride (raw sludge) having the following properties. 38% aqueous solution) 3000m
g / l and the amphoteric polymer was 130 mg / l
It was added, refined, granulated, and dewatered by a belt press dewatering machine. As the amphoteric polymer, a copolymer composed of dimethylaminoethyl acrylate, acrylamide and acrylic acid was used. Original mud properties SS: 10500mg / l BOD: 3700mg / l COD: 3700mg / l T-N: 810mg / l PO 4 -P: 140mg / l As a result, dehydration cake moisture content of 73.2% and a low moisture content Obtained.
【００３１】この実験において添加した塩化第二鉄３０
００ｍｇ／ｌ中の鉄は原泥中のＰＯ4 −Ｐに対してモル
比で１．５５倍に相当し、脱水濾液（洗浄水含ます）中
のＰＯ4 −Ｐは３．３ｍｇ／ｌと低濃度になった。この
脱水濾液の性状を表１に示す。The ferric chloride 30 added in this experiment
Iron in 200 mg / l is equivalent to 1.55 times the molar ratio with respect to PO 4 -P original mud, PO 4 -P in dewatering the filtrate (to include wash water) and 3.3 mg / l The concentration became low. Table 1 shows the properties of the dehydrated filtrate.
【００３２】この脱水濾液を原水として硝化・脱窒法に
より生物処理を行なうことにしたが、ＢＯＤ１４８０ｍ
ｇ／ｌに対してＰＯ4 −Ｐは３．３ｍｇ／ｌと低濃度で
あり、通常の生物処理で必要とされるＢＯＤ：Ｐ比（１
００：１）の１／４以下とリンが大幅に不足していた。The dehydrated filtrate was used as raw water for biological treatment by the nitrification / denitrification method.
PO 4 -P is as low as 3.3 mg / l with respect to g / l, and the BOD: P ratio (1
00: 1) or less, and phosphorus was significantly insufficient.
【００３３】そこで、脱水濾液量の５体積％に相当する
し尿（性状は表１に示す通り。）を濾液に加えて生物処
理の原水とした。その結果、脱水濾液とし尿の混合によ
り、表１に示すような性状の液が得られ、この混合液の
ＢＯＤ：Ｐの比は９６：１であり、生物処理に適切な比
を示した。Then, human waste (characteristics as shown in Table 1) corresponding to 5% by volume of the dehydrated filtrate was added to the filtrate to obtain raw water for biological treatment. As a result, a liquid having the properties shown in Table 1 was obtained by mixing the dehydrated filtrate with urine, and the BOD: P ratio of this mixed liquid was 96: 1, indicating an appropriate ratio for biological treatment.
【００３４】[0034]
【表１】 [Table 1]
【００３５】この混合液を希釈することなく、図１に示
す生物学的硝化・脱窒工程Ａにより処理したところ、Ｂ
ＯＤ：８．８ｍｇ／ｌ、ＣＯＤ：７５ｍｇ／ｌ、Ｔ−
Ｎ：１５ｍｇ／ｌ、ＰＯ4 −Ｐ：０．８ｍｇ／ｌの高水
質処理水が得られた。This mixture was treated in the biological nitrification / denitrification step A shown in FIG.
OD: 8.8 mg / l, COD: 75 mg / l, T-
N: 15mg / l, PO 4 -P: high quality treated water 0.8 mg / l was obtained.
【００３６】[0036]
【発明の効果】以上詳述した通り、本発明のし尿系汚水
の処理方法によれば、浄化槽汚泥を主とし、し尿が混合
されてなるし尿系汚水に無機凝集剤及び高分子凝集剤を
添加して脱水処理し、得られた脱水分離水を生物学的硝
化・脱窒工程にて処理する方法において、生物学的硝化
・脱窒工程におけるリンの不足を有効に補って、効率的
な処理を行なうことができる。As described above in detail, according to the method for treating human wastewater of the present invention, an inorganic flocculant and a high-molecular flocculant are added to human wastewater mainly composed of septic tank sludge mixed with human waste. In the biological nitrification and denitrification process, which effectively compensates for the lack of phosphorus in the biological nitrification and denitrification process, and provides efficient treatment. Can be performed.
【００３７】本発明の方法によれば、 無機凝集剤と高分子凝集剤との併用による直接脱水
により、低含水率の脱水ケーキが得られる。 生物処理の負荷が大幅に低減される。 リンが高度に除去された処理水が得られる。 脱水分離液の生物学的硝化・脱窒工程で別途リン化
合物を栄養源として補給する必要がない。 などの優れた効果が奏され、高水質の処理水を効率良く
得ることが可能とされる。According to the method of the present invention, a dewatered cake having a low water content can be obtained by direct dehydration using an inorganic flocculant and a polymer flocculant in combination. The load of biological treatment is greatly reduced. A treated water from which phosphorus is highly removed is obtained. There is no need to separately supply a phosphorus compound as a nutrient source in the biological nitrification / denitrification step of the dehydrated separated liquid. Thus, it is possible to efficiently obtain high-quality treated water.
【図１】本発明のし尿系汚水の処理装置の一実施例方法
を示す系統図である。FIG. 1 is a system diagram showing a method of an embodiment of an apparatus for treating human wastewater of the present invention.
【図２】従来法を示す系統図である。FIG. 2 is a system diagram showing a conventional method.
【図３】従来法を示す系統図である。FIG. 3 is a system diagram showing a conventional method.
１，２ 受入槽 ３ 前処理工程 ４，５，９ 貯留槽 ６ 第１反応槽 ７ 第２反応槽 ８ 脱水機 １０ 脱窒素槽 １１ 硝化槽 １２ 二次脱窒素槽 １３ 再曝気槽 １４ 沈澱槽 1, 2 receiving tank 3 pretreatment step 4, 5, 9 storage tank 6 first reaction tank 7 second reaction tank 8 dehydrator 10 denitrification tank 11 nitrification tank 12 secondary denitrification tank 13 re-aeration tank 14 precipitation tank
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/34 101 C02F 3/34 ZAB C02F 11/00 ZAB C02F 11/14 ZAB ────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) C02F 3/34 101 C02F 3/34 ZAB C02F 11/00 ZAB C02F 11/14 ZAB
Claims (1)
なるし尿系汚水に無機凝集剤及び高分子凝集剤を添加し
て脱水処理し、得られた脱水分離水を生物学的硝化・脱
窒工程にて処理する方法において、該生物学的硝化・脱窒工程の流入水のＢＯＤ：Ｐの比が
１００：１前後となるように、 前記し尿系汚水の一部及
び／又はし尿の一部を分取して該生物学的硝化・脱窒工
程に導入することを特徴とするし尿系汚水の処理方法。1. A dewatering treatment is performed by adding an inorganic flocculant and a polymer flocculant to a human waste sewage, which is mainly composed of a septic tank sludge and mixed with night soil, and subjecting the obtained dewatered separated water to biological nitrification and dewatering. In the method of treating in the nitrification step, the ratio of BOD: P in the influent of the biological nitrification / denitrification step is
A treatment of human wastewater, characterized in that a part of the human wastewater and / or a part of the human waste is fractionated and introduced into the biological nitrification / denitrification step so as to be about 100: 1. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5018626A JP3036281B2 (en) | 1993-02-05 | 1993-02-05 | Treatment method of human wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5018626A JP3036281B2 (en) | 1993-02-05 | 1993-02-05 | Treatment method of human wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06226291A JPH06226291A (en) | 1994-08-16 |
| JP3036281B2 true JP3036281B2 (en) | 2000-04-24 |
Family
ID=11976835
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5018626A Expired - Fee Related JP3036281B2 (en) | 1993-02-05 | 1993-02-05 | Treatment method of human wastewater |
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| JP (1) | JP3036281B2 (en) |
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