JPH1157793A - Waste water treatment and device therefor - Google Patents
Waste water treatment and device thereforInfo
- Publication number
- JPH1157793A JPH1157793A JP22650797A JP22650797A JPH1157793A JP H1157793 A JPH1157793 A JP H1157793A JP 22650797 A JP22650797 A JP 22650797A JP 22650797 A JP22650797 A JP 22650797A JP H1157793 A JPH1157793 A JP H1157793A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- treatment
- treatment tank
- solid
- 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
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
-
- 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
- Y02W10/20—Sludge processing
Landscapes
- Activated Sludge Processes (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は有機性排水処理およ
び余剰汚泥の減容化処理方法に関する。The present invention relates to an organic wastewater treatment and a method for reducing excess sludge.
【０００２】[0002]
【従来の技術】現在の代表的な排水処理方法では、活性
汚泥法による好気処理、沈殿処理工程で発生した余剰汚
泥は脱水処理を行ったあと焼却または廃棄する方法が主
流である。2. Description of the Related Art In a typical wastewater treatment method at present, surplus sludge generated in an aerobic treatment and a sedimentation treatment by an activated sludge method is subjected to dehydration treatment and then incinerated or discarded.
【０００３】この方法では大量に発生する余剰汚泥の処
理に、大きな動力を消費する脱水機や乾燥機を用意する
必要があった。その後焼却する場合には大量の熱エネル
ギーが必要となり、また廃棄する場合には廃棄費用がか
かり、廃棄費用は廃棄場所や規制の問題で年々上昇して
きているのが現状である。In this method, it is necessary to prepare a dehydrator or a dryer that consumes a large amount of power to treat a large amount of excess sludge. Subsequent incineration requires a large amount of thermal energy, and disposal requires a disposal cost. The disposal cost is increasing year by year due to disposal sites and regulations.
【０００４】これに対し、汚泥を減容化して余剰汚泥発
生量を減らし、余剰汚泥処理費用を減らす方法が各種試
みられており、嫌気処理による汚泥の減容化や、湿式酸
化、特開平8-206688号公報や特開平8-257597号公報など
に見られるオゾン処理、特開平9-10791号公報などに見
られる高温による処理、特開平3-8496号公報にみられる
アルカリ、酸性下で加温滞留させるなどの方法が開示さ
れている。[0004] On the other hand, various methods have been attempted to reduce the volume of sludge to reduce the amount of excess sludge generated and to reduce the cost of processing excess sludge. -206688, JP-A-8-257597, etc., ozone treatment, JP-A-9-10791, etc., treatment with high temperature, alkali and acid under acidity shown in JP-A-3-8496. Methods such as warm residence are disclosed.
【０００５】しかしこれらの汚泥処理方法にはそれぞれ
設置面積が大きい、処理費が高いなどの欠点があり、汚
泥処理の標準となるには至っていないのが現状である。[0005] However, these sludge treatment methods have disadvantages such as a large installation area and a high treatment cost, and at present, they have not become a standard for sludge treatment.
【０００６】例えば汚泥減容化方法で、汚泥にオゾン処
理、アルカリ処理など物理化学的処理を施し活性汚泥槽
に返送する方法は、活性汚泥に返送される汚泥が易処理
物に加工されたのみであり、ＢＯＤ負荷自体は処理前と
ほとんど変わっていない。このために、返送する活性汚
泥槽に多大な負荷がかかり、既設の排水処理施設に活性
汚泥槽を増設せずに適用するには活性汚泥槽の処理能力
にかなりの余裕があることが必要であった。For example, in the sludge volume reduction method, sludge is subjected to physicochemical treatment such as ozone treatment or alkali treatment and returned to the activated sludge tank. Only sludge returned to the activated sludge is processed into an easily treated material. The BOD load itself is almost the same as before the processing. For this reason, a large load is applied to the activated sludge tank to be returned, and it is necessary for the activated sludge tank to have a considerable capacity in order to apply it without adding an activated sludge tank to an existing wastewater treatment facility. there were.
【０００７】[0007]
【発明が解決しようとする課題】本発明は既存の排水処
理にも適応できる簡便な余剰汚泥の発生量低減化方法を
提案するもので、余剰汚泥処理費用の低減をはかること
を目的とする。SUMMARY OF THE INVENTION The present invention proposes a simple method for reducing the amount of excess sludge which can be applied to existing wastewater treatment, and an object of the invention is to reduce excess sludge treatment costs.
【０００８】[0008]
【課題を解決するための手段】発明者らはより簡便なシ
ステムで汚泥減容化を行う目的を達成するため鋭意検討
の結果、「有機性排水を、好気処理槽で好気性処理を行
う工程と、該好気処理槽の処理液を固液分離する工程
と、該固液分離工程における分離汚泥の少なくとも一部
を汚泥処理槽へ導入し汚泥の減容化を行う工程とをもつ
排水処理方法において、該汚泥処理槽における処理液の
少なくとも一部を固液混合状態で好気処理槽へ返送する
ことを特徴とする排水処理方法」により目的は基本的に
達成される。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the purpose of reducing the volume of sludge with a simpler system. Wastewater having a step of solid-liquid separating the treatment liquid in the aerobic treatment tank, and a step of introducing at least a part of the separated sludge in the solid-liquid separation step into the sludge treatment tank to reduce the volume of the sludge. In the treatment method, at least a part of the treatment liquid in the sludge treatment tank is returned to the aerobic treatment tank in a solid-liquid mixed state, and the object is basically achieved.
【０００９】[0009]
【発明の実施の形態】以下本発明の詳細について具体的
に説明していく。本発明では、固液分離工程から発生す
る汚泥の少なくとも一部を汚泥処理槽へ導入し、減容化
を行うが、この後実質的にさらなる固液分離工程を経ず
に固液混合状態のまま好気処理槽に返送することによ
り、汚泥処理槽の後工程の固液分離装置を小型化もしく
は設置する必要がなく、省スペースに余剰汚泥発生量の
低減がはかれることを見出したものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be specifically described below. In the present invention, at least a part of the sludge generated from the solid-liquid separation step is introduced into the sludge treatment tank, and the volume is reduced. By returning the sludge to the aerobic treatment tank as it is, there is no need to downsize or install a solid-liquid separator in the post-process of the sludge treatment tank, and it has been found that the amount of excess sludge generated can be reduced in a space-saving manner. .
【００１０】本発明における好気処理槽で好気性処理を
行う工程とは、特に限定されるものではないが、活性汚
泥処理や微生物保持担体を用いた活性汚泥処理等があげ
られる。本発明では好気処理の手段を特に限定すること
はないが、一般的には通常の活性汚泥法を用いる。好気
処理槽の好適な例として活性汚泥槽がある。The step of performing the aerobic treatment in the aerobic treatment tank in the present invention is not particularly limited, but includes an activated sludge treatment and an activated sludge treatment using a microorganism-holding carrier. In the present invention, the means of the aerobic treatment is not particularly limited, but a general activated sludge method is generally used. A preferred example of the aerobic treatment tank is an activated sludge tank.
【００１１】本発明は前記好気処理槽で好気処理を行う
工程と汚泥処理槽で汚泥の減容化を行う工程の間に原則
として固液分離する工程を有する。固液分離する工程と
しては特に限定されるものではないが、重力による沈降
を利用した沈殿槽、物理的な固液分離手段である膜分
離、あるいは遠心力を利用した遠心分離などがある。好
気処理の後の固液分離処理は通常は沈殿槽が用いられる
ケースが多い。沈殿槽は固液分離して清澄な放流水を得
るとともに、沈降した汚泥の一部を前段の活性汚泥槽を
始めとする好気処理工程に返送し、好気処理工程での菌
体濃度を維持することにも役立っている。また、沈殿槽
での沈殿汚泥の一部は余剰汚泥として系外に排出され処
理される。The present invention has a step of solid-liquid separation between the step of performing aerobic treatment in the aerobic treatment tank and the step of reducing the volume of sludge in the sludge treatment tank in principle. The solid-liquid separation step is not particularly limited, but includes a sedimentation tank using sedimentation by gravity, membrane separation as a physical solid-liquid separation means, and centrifugation using centrifugal force. The solid-liquid separation treatment after the aerobic treatment usually uses a sedimentation tank in many cases. The sedimentation tank separates into solid and liquid to obtain clear effluent, and returns a part of the settled sludge to the aerobic treatment process including the activated sludge tank at the preceding stage to reduce the bacterial cell concentration in the aerobic treatment process. It has also helped to maintain. Further, part of the settled sludge in the settling tank is discharged out of the system as excess sludge and is treated.
【００１２】場合によっては、さらに排出する汚泥を濃
縮するために汚泥濃縮槽を設けるケースもある。汚泥濃
縮槽は基本的に沈殿槽と同じ重力による沈降を利用した
固液分離装置である。本発明の効果には汚泥濃縮槽は必
ずしも必要ではなく、基本的にはなくても構わない。In some cases, a sludge thickening tank is provided to further concentrate the sludge to be discharged. A sludge thickening tank is a solid-liquid separation device that basically uses sedimentation by gravity, which is the same as a sedimentation tank. The sludge concentration tank is not always necessary for the effect of the present invention, and may not be basically provided.
【００１３】通常の汚泥処理では汚泥処理槽の後に固液
分離装置が設置されるケースが多い。これは汚泥の上澄
みを放流または活性汚泥槽に環流して沈殿のみを脱水等
の処理を行い廃棄することを考慮しているが、発明者ら
の実験においては、特に好気処理の汚泥処理では処理液
の沈降性が悪化するケースがあり、実装置では沈殿槽を
大きくとるか機械的な固液分離装置の設置が示唆され
て、簡便な発生余剰汚泥低減法としてはやや難しいこと
が判った。In ordinary sludge treatment, a solid-liquid separation device is often installed after the sludge treatment tank. This considers that the sludge supernatant is discharged or recirculated to the activated sludge tank and only the sediment is subjected to a treatment such as dehydration and discarded.However, in the experiments of the inventors, particularly in the aerobic sludge treatment, In some cases, the sedimentation of the treatment liquid deteriorated, suggesting that a large sedimentation tank or a mechanical solid-liquid separation device was installed in the actual equipment, which proved to be somewhat difficult as a simple method for reducing excess sludge generated. .
【００１４】これに対して固液混合状態で活性汚泥槽に
返送する本発明では少なくとも活性汚泥槽への返送分に
ついては固液分離操作の必要がなく汚泥処理槽処理液の
沈降性に配慮する必要がない。また、特に汚泥処理を高
アルカリ・高温条件で行った場合には汚泥処理槽と活性
汚泥槽で生育する菌の種類が異なるため、汚泥処理槽か
ら活性汚泥槽に返送される有機物中の微生物が活性汚泥
槽の微生物に及ぼす影響を低減できる。On the other hand, in the present invention in which the solid-liquid mixed state is returned to the activated sludge tank, at least for the part returned to the activated sludge tank, there is no need for a solid-liquid separation operation, and consideration is given to the sedimentation of the sludge treatment tank treatment liquid. No need. In addition, especially when sludge treatment is performed under high alkali and high temperature conditions, the types of bacteria that grow in the sludge treatment tank and the activated sludge tank are different. The effect on the microorganisms in the activated sludge tank can be reduced.
【００１５】汚泥処理槽では被処理液中の有機物の一部
は汚泥処理槽中の微生物により分解され炭酸ガスと汚泥
および汚泥処理槽で可溶化された汚泥となる。炭酸ガス
に分解された分は確実に減容化され、本発明のように活
性汚泥槽に返送することにより、汚泥処理槽雰囲気で可
溶化された汚泥は活性汚泥槽で易処理物としてさらに減
容化することができる。また、前述の通り菌の生育環境
が異なるため活性汚泥槽および沈殿槽に代表される固液
分離装置にはほとんど影響なく固液分離が可能となる。
このため、本発明のように汚泥処理槽を追加するのみの
簡便な方法で有効な発生余剰汚泥の減量化が可能とな
る。In the sludge treatment tank, a part of the organic matter in the liquid to be treated is decomposed by microorganisms in the sludge treatment tank to carbon dioxide, sludge, and sludge solubilized in the sludge treatment tank. The volume decomposed into carbon dioxide is surely reduced in volume, and by returning it to the activated sludge tank as in the present invention, the sludge solubilized in the sludge treatment tank atmosphere is further reduced as an easily treated material in the activated sludge tank. Can be embodied. Further, as described above, the growth environment of the bacteria is different, so that the solid-liquid separation can be performed with almost no influence on the solid-liquid separation device represented by the activated sludge tank and the settling tank.
For this reason, it is possible to effectively reduce the amount of generated excess sludge by a simple method of merely adding a sludge treatment tank as in the present invention.
【００１６】本発明に用いられる汚泥処理槽の処理条件
としては、活性汚泥槽と菌の生育状況を変化させるため
と可溶化を促進させるため、ｐＨ８以上の高ｐＨや40℃
以上の処理温度が好ましいが、特に限定されるものでは
ない。この時、高ｐＨ高温での生育に適した菌を用いて
処理すること、さらには自己発熱での高温の維持、自己
代謝物による高ｐＨの維持ができる菌を用いることが効
果的である。また、固液混合状態を保つためおよび炭酸
ガスへの分解を促進するために好気的処理が好ましいが
特に限定されるものではない。The treatment conditions of the sludge treatment tank used in the present invention include a high pH of 8 or more and a temperature of 40 ° C. in order to change the growth state of the activated sludge tank and the bacteria and to promote solubilization.
The above processing temperature is preferable, but is not particularly limited. At this time, it is effective to treat with a bacterium suitable for growth at a high pH and a high temperature, and to use a bacterium capable of maintaining a high temperature by self-heating and maintaining a high pH by a self-metabolite. Further, in order to maintain a solid-liquid mixed state and to promote decomposition into carbon dioxide gas, aerobic treatment is preferable, but not particularly limited.
【００１７】本発明に用いられる装置としては汚泥処理
槽の処理液の少なくとも一部を固液混合状態で活性汚泥
槽に返送する手段をもつことが基本である。どれほどの
割合を返送するかは特に限定されるものではないが、汚
泥処理槽から排出される処理液（固液あわせて）の50％
以上を活性汚泥槽に返送することが好ましく、特に90％
以上がより好ましい。このとき残りの処理液を沈殿槽や
汚泥濃縮槽などに返送するケースもある。また、実施条
件によっては多少の固液分離がなされていても良いが、
あまり手間のかかる固液分離方法では、本発明の目的に
適合せず、分離割合は汚泥濃度比（分離された液体のML
SS／もとの固液混合体のMLSS）でせいぜい70％程度まで
である。返送の際、汚泥処理槽では必要に応じて菌体の
生育に適した温度・ｐＨにコントロールする設備をもた
せることによりさらに処理を安定させる方法もあるが、
特に限定されるものではない。また、汚泥処理槽への流
入水は活性汚泥槽直後の固液分離装置から汚泥に限定さ
れず、例えば汚泥濃縮槽で発生する濃縮汚泥でも構わな
い。The apparatus used in the present invention basically has a means for returning at least a part of the treatment liquid in the sludge treatment tank to the activated sludge tank in a solid-liquid mixed state. The percentage returned is not particularly limited, but 50% of the treatment liquid (total of solid and liquid) discharged from the sludge treatment tank
It is preferable to return the above to the activated sludge tank, especially 90%
The above is more preferable. At this time, there is a case where the remaining processing liquid is returned to a sedimentation tank or a sludge concentration tank. Also, some solid-liquid separation may be performed depending on the implementation conditions,
The solid-liquid separation method that is too laborious does not meet the purpose of the present invention, and the separation ratio is the sludge concentration ratio (ML of the separated liquid).
SS / MLSS of the original solid-liquid mixture) up to about 70%. At the time of return, there is a method to further stabilize the treatment by providing equipment that controls the temperature and pH suitable for the growth of bacteria as needed in the sludge treatment tank,
There is no particular limitation. Further, the inflow water into the sludge treatment tank is not limited to sludge from the solid-liquid separation device immediately after the activated sludge tank, and may be, for example, concentrated sludge generated in a sludge concentration tank.
【００１８】以下、図面を参照していきながら、本発明
を説明してゆくが、何らこれに限定されるものではな
い。Hereinafter, the present invention will be described with reference to the drawings, but the present invention is not limited thereto.
【００１９】図１において、活性汚泥槽（１）には、排
水流入ライン（５）を通じて処理すべき廃水が供給さ
れ、処理されて発生した汚泥は沈殿槽流入ライン（６）
により、沈殿槽（２）へ送られる。In FIG. 1, wastewater to be treated is supplied to an activated sludge tank (1) through a drainage inflow line (5), and sludge generated by the treatment is supplied to a settling tank inflow line (6).
Is sent to the sedimentation tank (2).
【００２０】固液分離工程として沈殿槽（２）を用いた
場合には、沈殿槽流入ライン（６）により分離すべき汚
泥が供給され、固液分離して処理水流出ライン（７）に
より清澄な放流水が排出される。汚泥返送ライン（９）
により沈降した汚泥の一部を前段の活性汚泥槽（１）に
返送する。また、余剰汚泥排出ライン（１１）により沈
殿汚泥の一部は余剰汚泥として系外に排出される。When the sedimentation tank (2) is used in the solid-liquid separation step, the sludge to be separated is supplied through the sedimentation tank inflow line (6), separated into solid and liquid, and clarified by the treated water outflow line (7). Effluent is discharged. Sludge return line (9)
A part of the sludge settled by the above is returned to the activated sludge tank (1) in the preceding stage. A part of the settled sludge is discharged outside the system as surplus sludge by the surplus sludge discharge line (11).
【００２１】固液分離された汚泥は汚泥処理槽流入ライ
ン（１０）により汚泥処理槽（４）に供給される。ここ
で処理された汚泥は、汚泥処理液ライン（１３）によ
り、活性汚泥槽（１）に返送される。The sludge separated into solid and liquid is supplied to the sludge treatment tank (4) through the sludge treatment tank inflow line (10). The sludge treated here is returned to the activated sludge tank (1) by the sludge treatment liquid line (13).
【００２２】又、図２のように沈殿槽（２）と汚泥処理
槽（４）の間に汚泥濃縮槽（３）を設けた場合、沈殿槽
（２）からの汚泥は汚泥濃縮槽流入ライン（８）により
送られ、濃縮後は汚泥処理槽流入ライン（１０）により
の汚泥処理槽（４）に送られる。また、汚泥濃縮槽での
上澄み液は汚泥濃縮槽流出ライン（１２）から活性汚泥
槽（１）などに返送され、沈殿汚泥の一部は汚泥排出ラ
イン（１１）により余剰汚泥として系外に排出される。When a sludge thickening tank (3) is provided between the sedimentation tank (2) and the sludge treatment tank (4) as shown in FIG. 2, sludge from the sedimentation tank (2) is supplied to the sludge thickening tank inflow line. After being concentrated, it is sent to the sludge treatment tank (4) by the sludge treatment tank inflow line (10). The supernatant liquid in the sludge thickening tank is returned from the sludge thickening tank outflow line (12) to the activated sludge tank (1) and the like, and a part of the settled sludge is discharged outside the system as sludge by the sludge discharge line (11). Is done.
【００２３】[0023]
（実施例１）槽容量12 Lの活性汚泥槽、槽容量3 Lの沈
殿槽、槽容量0.3 Lの汚泥濃縮槽、槽容量0.8 Lの汚泥処
理槽の装置構成で排水処理実験を行った。活性汚泥槽へ
の流入水はBOD 0.3 g/Lの合成下水を14 mL/minとした。
汚泥濃縮槽からの引き抜き汚泥のうち0.4 L/dを汚泥処
理槽に送り、温度45℃、ｐＨ9の条件下で汚泥を分解す
る微生物により好気的に処理を行った。汚泥処理槽から
固液混合状態での処理水0.4 L/dを取り出し、活性汚泥
槽へ還流した。このとき汚泥濃縮槽から系外に排出され
る余剰汚泥は脱水後8 mL/dであった。(Example 1) A wastewater treatment experiment was performed using an activated sludge tank having a capacity of 12 L, a sedimentation tank having a capacity of 3 L, a sludge concentration tank having a capacity of 0.3 L, and a sludge treatment tank having a capacity of 0.8 L. The inflow water into the activated sludge tank was 14 mL / min of synthetic sewage with a BOD of 0.3 g / L.
0.4 L / d of the sludge withdrawn from the sludge thickening tank was sent to a sludge treatment tank, and was aerobically treated with microorganisms that decompose sludge at a temperature of 45 ° C. and pH9. 0.4 L / d of the treated water in a solid-liquid mixed state was taken out of the sludge treatment tank and refluxed to the activated sludge tank. At this time, the excess sludge discharged from the sludge thickening tank to the outside of the system was 8 mL / d after dehydration.
【００２４】（比較例１）槽容量12 Lの活性汚泥槽、槽
容量3 Lの沈殿槽、槽容量0.3 Lの汚泥濃縮槽の装置構成
で排水処理実験を行った。活性汚泥槽への流入水はBOD
0.3 g/Lの合成下水を14 mL/minとした。このとき汚泥濃
縮槽から系外に排出される余剰汚泥は脱水後20 mL/dで
あった。(Comparative Example 1) A wastewater treatment experiment was carried out using an activated sludge tank having a capacity of 12 L, a sedimentation tank having a capacity of 3 L, and a sludge concentration tank having a capacity of 0.3 L. Influent into the activated sludge tank is BOD
0.3 g / L of synthetic sewage was adjusted to 14 mL / min. At this time, the excess sludge discharged from the sludge thickening tank to the outside of the system was 20 mL / d after dehydration.
【００２５】[0025]
【発明の効果】有機性排水を、少なくとも好気処理槽で
好気性処理を行う工程と、該好気処理槽の処理液を固液
分離する工程と、分離汚泥の少なくとも一部を汚泥処理
槽へ導入し汚泥の減容化を行う工程をもつ汚泥処理方法
において、該汚泥処理槽処理液の少なくとも一部を固液
混合状態で好気処理槽へ返送することにより、汚泥処理
槽の後工程の固液分離装置を小型化もしくは設置する必
要がなく、省スペースに発生余剰汚泥量の低減がはかれ
るThe organic wastewater is subjected to an aerobic treatment at least in an aerobic treatment tank, a step of solid-liquid separation of the treatment liquid in the aerobic treatment tank, and at least a part of the separated sludge is treated in a sludge treatment tank. A sludge treatment method having a step of reducing the volume of sludge by introducing the sludge treatment tank into the aerobic treatment tank by returning at least a part of the treatment liquid in a solid-liquid mixed state to the aerobic treatment tank. It is not necessary to downsize or install a solid-liquid separation device, and the amount of excess sludge generated can be reduced in a small space.
【図１】 本発明の排水処理装置の一例を示したもので
ある。FIG. 1 shows an example of a wastewater treatment apparatus of the present invention.
【図２】 本発明の排水処理装置で汚泥濃縮槽を使用し
た一例を示したものである。FIG. 2 shows an example in which a sludge thickening tank is used in the wastewater treatment apparatus of the present invention.
１：活性汚泥槽 ２：沈殿槽 ３：汚泥濃縮槽 ４：汚泥処理槽 ５：排水流入ライン ６：沈殿槽流入ライン ７：処理水流出ライン ８：汚泥濃縮槽流入ライン ９：汚泥返送ライン １０：汚泥処理槽流入ライン １１：余剰汚泥排出ライン １２：汚泥濃縮槽流出ライン １３：汚泥処理液ライン 1: activated sludge tank 2: sedimentation tank 3: sludge concentration tank 4: sludge treatment tank 5: wastewater inflow line 6: sedimentation tank inflow line 8: treated water outflow line 8: sludge concentration tank inflow line 9: sludge return line 10: Sludge treatment tank inflow line 11: Excess sludge discharge line 12: Sludge thickening tank outflow line 13: Sludge treatment liquid line
Claims (9)
を行う工程と、該好気処理槽の処理液を固液分離する工
程と、該固液分離工程における分離汚泥の少なくとも一
部を汚泥処理槽へ導入し汚泥の減容化を行う工程とをも
つ排水処理方法において、該汚泥処理槽における処理液
の少なくとも一部を固液混合状態で好気処理槽へ返送す
ることを特徴とする排水処理方法。1. An aerobic treatment of an organic wastewater in an aerobic treatment tank, a step of solid-liquid separation of a treatment liquid in the aerobic treatment tank, and at least one of separated sludge in the solid-liquid separation step. Introducing a part into the sludge treatment tank to reduce the volume of sludge, wherein at least a part of the treatment liquid in the sludge treatment tank is returned to the aerobic treatment tank in a solid-liquid mixed state. A characteristic wastewater treatment method.
われることを特徴とする請求項１の排水処理方法。2. The wastewater treatment method according to claim 1, wherein the treatment in the sludge treatment tank is performed in an alkaline state.
上であることを特徴とする請求項２の排水処理方法。3. The wastewater treatment method according to claim 2, wherein the alkaline state in the sludge treatment tank is pH 8 or more.
徴とする請求項１〜３のいずれかに記載の排水処理方
法。4. The wastewater treatment method according to claim 1, wherein the sludge treatment temperature is 40 ° C. or higher.
であることを特徴とする請求項１〜４のいずれかに記載
の排水処理方法。5. The wastewater treatment method according to claim 1, wherein the treatment in the sludge treatment tank is an aerobic microorganism treatment.
汚泥処理槽とをもつ排水処理装置であって、該汚泥処理
槽処理液の少なくとも一部を、好気処理槽へ固液混合状
態で返送する手段をもつことを特徴とする排水処理装
置。6. A wastewater treatment apparatus having at least an aerobic treatment tank, a solid-liquid separation means, and a sludge treatment tank, wherein at least a part of the sludge treatment tank treatment liquid is solid-liquid mixed into the aerobic treatment tank. A wastewater treatment device having means for returning the wastewater.
薬液注入設備を持つことを特徴とする請求項６の排水処
理装置。7. The wastewater treatment apparatus according to claim 6, wherein the sludge treatment tank has a chemical liquid injection facility for keeping the pH in an alkaline state.
特徴とする請求項６〜７のいずれかに記載の排水処理装
置。8. The wastewater treatment apparatus according to claim 6, wherein the sludge treatment tank has a temperature adjusting function.
徴とする請求項６〜８のいずれかに記載の排水処理装
置。9. The wastewater treatment apparatus according to claim 6, wherein an aeration device is provided in the sludge treatment tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22650797A JPH1157793A (en) | 1997-08-22 | 1997-08-22 | Waste water treatment and device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22650797A JPH1157793A (en) | 1997-08-22 | 1997-08-22 | Waste water treatment and device therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1157793A true JPH1157793A (en) | 1999-03-02 |
Family
ID=16846213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22650797A Pending JPH1157793A (en) | 1997-08-22 | 1997-08-22 | Waste water treatment and device therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1157793A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000263093A (en) * | 1999-03-15 | 2000-09-26 | Maezawa Ind Inc | Waste water treatment apparatus |
| JP2002282898A (en) * | 2001-03-26 | 2002-10-02 | Sumitomo Heavy Ind Ltd | Drainage treatment system |
| JP2009255088A (en) * | 2009-08-06 | 2009-11-05 | Fuji Koki Kk | Surplus sludge volume reduction apparatus |
| CN105366902A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Sludge treatment method with improved dehydration performance |
| CN105366903A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Dewatering regulating method for sludge |
| CN105366901A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Sludge treatment method improving dehydration efficiency |
| CN105366906A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Biochemical treatment method for heavy metal in sludge |
| CN105502861A (en) * | 2015-12-15 | 2016-04-20 | 南安市先创环保技术服务有限公司 | Sludge treatment device improving hydration efficiency |
| CN105502862A (en) * | 2015-12-15 | 2016-04-20 | 南安市先创环保技术服务有限公司 | Sludge heavy metal biochemical treatment tank |
| CN105541068A (en) * | 2015-12-15 | 2016-05-04 | 南安市先创环保技术服务有限公司 | Sludge treatment equipment for improving heavy metal removal efficiency |
-
1997
- 1997-08-22 JP JP22650797A patent/JPH1157793A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000263093A (en) * | 1999-03-15 | 2000-09-26 | Maezawa Ind Inc | Waste water treatment apparatus |
| JP2002282898A (en) * | 2001-03-26 | 2002-10-02 | Sumitomo Heavy Ind Ltd | Drainage treatment system |
| JP2009255088A (en) * | 2009-08-06 | 2009-11-05 | Fuji Koki Kk | Surplus sludge volume reduction apparatus |
| CN105366902A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Sludge treatment method with improved dehydration performance |
| CN105366903A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Dewatering regulating method for sludge |
| CN105366901A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Sludge treatment method improving dehydration efficiency |
| CN105366906A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Biochemical treatment method for heavy metal in sludge |
| CN105502861A (en) * | 2015-12-15 | 2016-04-20 | 南安市先创环保技术服务有限公司 | Sludge treatment device improving hydration efficiency |
| CN105502862A (en) * | 2015-12-15 | 2016-04-20 | 南安市先创环保技术服务有限公司 | Sludge heavy metal biochemical treatment tank |
| CN105541068A (en) * | 2015-12-15 | 2016-05-04 | 南安市先创环保技术服务有限公司 | Sludge treatment equipment for improving heavy metal removal efficiency |
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