JP6702656B2 - Granule forming method and granule forming apparatus - Google Patents
Granule forming method and granule forming apparatus Download PDFInfo
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- 239000008187 granular material Substances 0.000 title claims description 72
- 238000000034 method Methods 0.000 title claims description 68
- 238000006243 chemical reaction Methods 0.000 claims description 78
- 239000010802 sludge Substances 0.000 claims description 57
- 239000002351 wastewater Substances 0.000 claims description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 239000005416 organic matter Substances 0.000 claims description 31
- 238000004062 sedimentation Methods 0.000 claims description 29
- 230000007423 decrease Effects 0.000 claims description 12
- 230000000813 microbial effect Effects 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 238000005273 aeration Methods 0.000 description 17
- 238000003756 stirring Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 7
- 235000003642 hunger Nutrition 0.000 description 7
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- 230000000052 comparative effect Effects 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 235000019553 satiation Nutrition 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
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- 239000010419 fine particle Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
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Classifications
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- 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
Landscapes
- Biological Treatment Of Waste Water (AREA)
- Activated Sludge Processes (AREA)
Description
本発明は、グラニュールを安定的に形成するためのグラニュールの形成方法、およびグラニュールの形成装置の技術に関する。 The present invention relates to a granule forming method for stably forming granules, and a technique of a granule forming apparatus.
従来、有機物等を含む有機物含有排水の生物学的排水処理には、フロックと呼ばれる微生物の集合体（好気性生物汚泥）を活用した活性汚泥法が用いられている。しかし、活性汚泥法では、沈殿池でフロック（好気性生物汚泥）と処理水とを分離する際、フロックの沈降速度が遅いために沈殿池の表面積を非常に大きくしなければならない場合がある。また、活性汚泥法の処理速度は、生物処理槽内の汚泥濃度に依存しており、汚泥濃度を高めることで処理速度を増加させることができるが、汚泥濃度を１５００〜５０００ｍｇ／Ｌの範囲またはそれ以上に増加させると、沈殿池でのバルキング等により固液分離が困難となり、処理を維持することができなくなる場合がある。 BACKGROUND ART Conventionally, an activated sludge method utilizing an aggregate of microorganisms called a floc (aerobic biological sludge) has been used for biological wastewater treatment of organic matter-containing wastewater containing organic matter and the like. However, in the activated sludge method, when separating flocs (aerobic biological sludge) and treated water in a sedimentation tank, there are cases where the surface area of the sedimentation tank must be very large because the sedimentation speed of the flocs is slow. Further, the treatment rate of the activated sludge method depends on the sludge concentration in the biological treatment tank, and the treatment rate can be increased by increasing the sludge concentration, but the sludge concentration is in the range of 1500 to 5000 mg/L or If the amount is further increased, solid-liquid separation may be difficult due to bulking in the sedimentation tank, and the treatment may not be maintained.
一方、嫌気性生物処理では、グラニュールと呼ばれる微生物が緻密に集合し粒状となった集合体（嫌気性生物汚泥）を活用することが一般的である。グラニュールは非常に沈降速度が速く、微生物が緻密に集合しているため、生物処理槽内の汚泥濃度を高くすることができ、排水の高速処理を実現することが可能である。しかし、嫌気性生物処理は、好気性処理（活性汚泥法）に比べて処理対象の排水種が限られていることや、処理水温を３０〜３５℃程度に維持する必要がある等の問題点を有する場合がある。また、嫌気性生物処理単独では、処理水の水質が悪く、河川等へ放流する場合には、活性汚泥法等の好気性処理を別途実施することが必要となる場合もある。 On the other hand, in the treatment of anaerobic organisms, it is common to utilize an aggregate (anaerobic biological sludge) in which microorganisms called granules are densely aggregated to form a granular form. Since granules have a very fast sedimentation rate and microorganisms are densely assembled, the sludge concentration in the biological treatment tank can be increased, and high-speed treatment of wastewater can be realized. However, the anaerobic biological treatment has a problem that the wastewater species to be treated are limited as compared with the aerobic treatment (activated sludge method), and the treated water temperature needs to be maintained at about 30 to 35°C. May have. In addition, when the anaerobic biological treatment is performed alone, the quality of the treated water is poor, and when it is discharged to a river or the like, it may be necessary to separately carry out an aerobic treatment such as an activated sludge method.
近年、排水を間欠的に反応槽に流入させる半回分式処理装置を用いて処理を行い、さらに生物汚泥の沈降時間を短縮することで、嫌気性生物汚泥に限られず、好気性生物汚泥でも沈降性の良いグラニュール化した生物汚泥を形成できることが明らかとなってきた（例えば、特許文献１〜４参照）。好気性生物汚泥をグラニュール化させることで、平均粒径が０．２ｍｍ以上となり、沈降速度が５ｍ／ｈ以上とすることが可能となる。なお、半回分式処理装置では、１つの生物処理槽で（１）排水の流入、（２）処理対象物質の生物処理、（３）生物汚泥の沈降、（４）処理水の排出といった４つの工程により処理が行われる。上記のような沈降性の良いグラニュール化した好気性生物汚泥を形成することで、槽内汚泥濃度を高濃度に維持することが可能となり、高速処理が可能となる。 In recent years, by using a semi-batch type treatment device that allows wastewater to intermittently flow into the reaction tank, and by shortening the settling time of biological sludge, it is not limited to anaerobic biological sludge, and even aerobic biological sludge settles. It has become clear that it is possible to form a granulated biological sludge having good properties (see, for example, Patent Documents 1 to 4). By granulating the aerobic biological sludge, the average particle diameter becomes 0.2 mm or more, and the sedimentation speed can be 5 m/h or more. In addition, in the semi-batch type treatment device, one biological treatment tank has four types of (1) inflow of wastewater, (2) biological treatment of target substances, (3) sedimentation of biological sludge, and (4) discharge of treated water. Processing is performed according to the process. By forming the granulated aerobic biological sludge having a good sedimentation property as described above, the sludge concentration in the tank can be maintained at a high concentration, and high-speed treatment becomes possible.
しかし、半回分式反応槽を利用したグラニュール形成方法において、半回分式反応槽に投入される排水のＢＯＤ濃度が時間変動、日間変動する場合には、沈降性の高いグラニュール汚泥を安定して形成することが困難となる場合がある。 However, in the method for forming granules using a semi-batch reaction tank, when the BOD concentration of the wastewater fed into the semi-batch reaction tank changes with time or day, stable granule sludge with high sedimentability is stabilized. May be difficult to form.
本発明の目的は、半回分式反応槽を用いたグラニュール形成方法において、有機物含有排水のＢＯＤ濃度が変動しても、良好なグラニュールを形成することが可能なグラニュールの形成方法、及びグラニュールの形成装置を提供することにある。 An object of the present invention is to provide a granule forming method using a semi-batch type reaction tank, which is capable of forming good granules even if the BOD concentration of organic matter-containing wastewater varies, and It is to provide a granule forming device.
本発明は、有機物含有排水を流入させる流入工程と、好気条件で、前記有機物含有排水中の処理対象物質を微生物汚泥により生物学的に処理する生物処理工程と、前記微生物汚泥を沈降させる沈降工程と、前記生物学的に処理した生物処理水を排出させる排出工程とを繰り返し行ってグラニュールを形成する半回分式反応槽を用いたグラニュールの形成方法であって、前記生物処理工程では、前記半回分式反応槽内のｐＨをモニタリングし、前記生物処理工程の開始から、ｐＨが上昇した後低下する変曲点Ａまでの時間に対して５〜２５倍の範囲、または前記生物処理工程の開始から、ｐＨが低下した後上昇する変曲点Ｂまでの時間に対して１．５〜２．５倍の範囲で、前記生物処理工程の時間を設定し、設定した時間まで生物処理を行うグラニュールの形成方法である。 The present invention provides an inflow step of inflowing an organic matter-containing wastewater, a biological treatment step of biologically treating a substance to be treated in the organic matter-containing wastewater with microbial sludge under aerobic conditions, and a sedimentation to settle the microbial sludge. A method for forming granules using a semi-batch type reaction tank in which a step and a discharging step for discharging the biologically treated biologically treated water are repeated to form granules, wherein the biological treatment step is the monitoring the pH half-doses at type reaction vessel, wherein from the start of the biological treatment process, 5-25 fold range relative to the time until the inflection point a to decrease after pH rises or the organism, The time of the biological treatment step is set within a range of 1.5 to 2.5 times the time from the start of the treatment step to the inflection point B where the pH decreases and then rises. This is a method of forming granules for processing.
前記グラニュールの形成方法において、前記流入工程後で前記生物処理工程前に、又は前記生物処理工程後で前記沈降工程前に、無酸素条件で前記有機物含有排水を生物学的に処理する無酸素生物処理工程を含むことが好ましい。 In the method for forming granules , anoxic for biologically treating the organic matter-containing wastewater under anoxic conditions after the inflow step and before the biological treatment step or after the biological treatment step and before the sedimentation step. It is preferred to include a biological treatment step .
本発明は、有機物含有排水を流入させる流入工程と、好気条件で、前記有機物含有排水中の処理対象物質を微生物汚泥により生物学的に処理する生物処理工程と、前記微生物汚泥を沈降させる沈降工程と、前記生物学的に処理した生物処理水を排出させる排出工程とを繰り返し行ってグラニュールを形成する半回分式反応槽と、前記半回分式反応槽内のｐＨをモニタリングし、前記生物処理工程の開始から、ｐＨが上昇した後低下する変曲点Ａまでの時間に対して５〜２５倍の範囲、または前記生物処理工程の開始から、ｐＨが低下した後上昇する変曲点Ｂまでの時間に対して１．５〜２．５倍の範囲で、前記生物処理工程の時間を設定する制御部と、を備え、前記半回分式反応槽では、前記設定した時間まで前記生物処理工程を行うグラニュールの形成装置である。 The present invention provides an inflow step of inflowing an organic matter-containing wastewater, a biological treatment step of biologically treating a substance to be treated in the organic matter-containing wastewater with microbial sludge under aerobic conditions, and a sedimentation to settle the microbial sludge. a step, a semi-batch reactor the biologically treated water by repeating a discharge step of discharging to form granules treated with said biological monitors the pH of the semi-batch reaction vessel, said organism In the range of 5 to 25 times the time from the start of the treatment process to the inflection point A that decreases after the pH increases, or the inflection point B that increases after the pH decreases after the start of the biological treatment process. And a control unit for setting the time of the biological treatment step in a range of 1.5 to 2.5 times the time of the biological treatment step in the semi-batch type reaction tank. It is an apparatus for forming granules for performing steps.
本発明によれば、半回分式反応槽を用いたグラニュール形成方法において、有機物含有排水のＢＯＤ濃度が変動しても、良好なグラニュールを形成することが可能なグラニュールの形成方法、及びグラニュールの形成装置を提供することができる。 According to the present invention, in a granule forming method using a semi-batch type reaction tank, a granule forming method capable of forming good granules even if the BOD concentration of organic matter-containing wastewater varies, and A granule forming device can be provided.
本発明の実施の形態について以下説明する。本実施形態は本発明を実施する一例であって、本発明は本実施形態に限定されるものではない。 Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.
＜グラニュールの形成方法および形成装置＞
本発明の実施形態に係るグラニュールの形成装置の一例の概略を図１に示し、その構成について説明する。グラニュール形成装置１は、半回分式反応槽１０を備える。グラニュール形成装置１において、排水供給配管２２が排水流入ポンプ１２を介して半回分式反応槽１０の排水流入口に接続されている。半回分式反応槽１０の生物処理水排出口１６に生物処理水配管２４が生物処理水排出バルブ１８を介して接続されている。半回分式反応槽１０の内部の下部には、曝気用ポンプ１４に接続された曝気装置２６が設置されている。半回分式反応槽１０にはｐＨ計４０が設置されている。ｐＨ計４０は、制御装置２０と電気的接続されており、制御装置２０はｐＨ計４０により測定された半回分式反応槽１０内のｐＨ値を所定時間毎にモニタリングする。また、排水流入ポンプ１２、生物処理水排出バルブ１８、曝気用ポンプ１４は、それぞれ制御装置２０と電気的接続されており、制御装置２０はポンプの作動・停止、バルブの開閉等を制御する。
<Granule forming method and forming apparatus>
An outline of an example of a granule forming apparatus according to an embodiment of the present invention is shown in FIG. 1, and its configuration will be described. The granule forming apparatus 1 includes a semi-batch type reaction tank 10. In the granule forming apparatus 1, a drainage supply pipe 22 is connected to a drainage inlet of the semi-batch reaction tank 10 via a drainage inflow pump 12. A biological treated water pipe 24 is connected to the biological treated water discharge port 16 of the semi-batch type reaction tank 10 via a biological treated water discharge valve 18. An aeration device 26 connected to the aeration pump 14 is installed in the lower part inside the semi-batch type reaction tank 10. A pH meter 40 is installed in the semi-batch reaction tank 10. The pH meter 40 is electrically connected to the control device 20, and the control device 20 monitors the pH value in the semi-batch reaction tank 10 measured by the pH meter 40 at predetermined time intervals. The waste water inflow pump 12, the biological treated water discharge valve 18, and the aeration pump 14 are electrically connected to the control device 20, and the control device 20 controls the operation/stop of the pump, the opening/closing of the valve, and the like.
グラニュール形成装置１は、例えば、次のようなサイクルで運転される。 The granule forming device 1 is operated, for example, in the following cycle.
＜（１）流入工程＞
排水流入ポンプ１２が作動し、有機物含有排水が排水供給配管２２を通して半回分式反応槽１０に所定量流入される。
<(1) Inflow process>
The wastewater inflow pump 12 is operated, and a predetermined amount of the organic matter-containing wastewater flows into the semi-batch type reaction tank 10 through the wastewater supply pipe 22.
＜（２）生物処理工程＞
排水流入ポンプ１２が停止するとともに、曝気用ポンプ１４から空気等の酸素含有気体が半回分式反応槽１０に供給され、半回分式反応槽１０内で有機物含有排水中の処理対象物質が微生物汚泥により生物学的に処理される。生物反応は好気反応には限らず、空気等の供給は行わず、撹拌を行うことで無酸素反応を行うことも可能であるし、好気反応および無酸素反応を組み合わせてもよい。無酸素状態とは、溶存酸素は存在しないが、亜硝酸や硝酸由来の酸素等は存在している状態をいう。例えば、図２に示すように、モータ２８、撹拌翼３０、モータ２８と撹拌翼３０を接続するシャフト等により構成される撹拌装置を半回分式反応槽１０に設置して、曝気用ポンプ１４を停止して撹拌装置により撹拌を行えばよい。なお、撹拌装置は上記構成に制限されるものではない。
<(2) Biological treatment process>
When the drainage inflow pump 12 is stopped, an oxygen-containing gas such as air is supplied from the aeration pump 14 to the semi-batch reaction tank 10, and the substance to be treated in the organic matter-containing waste water in the semi-batch reaction tank 10 is microbial sludge. Biologically processed by. The biological reaction is not limited to the aerobic reaction, and the anoxic reaction can be performed by stirring without supplying air or the like, or the aerobic reaction and the anoxic reaction may be combined. The anoxic state means a state in which dissolved oxygen does not exist but oxygen such as nitrous acid and nitric acid is present. For example, as shown in FIG. 2, a stirring device including a motor 28, a stirring blade 30, and a shaft connecting the motor 28 and the stirring blade 30 is installed in the semi-batch reaction tank 10, and the aeration pump 14 is installed. It suffices to stop and stir with a stirrer. The stirring device is not limited to the above configuration.
生物処理工程では、ｐＨ計４０により半回分式反応槽１０内のｐＨが測定される。また、制御装置２０により、ｐＨ計４０により測定される半回分式反応槽１０内のｐＨ値が所定時間毎にモニタリングされ、後述するように生物処理工程の時間が調整される。調整された生物処理工程時間に達した時点で、例えば制御装置２０により曝気用ポンプ１４が停止される（図２のグラニュール形成槽１では撹拌装置も停止される）。 In the biological treatment process, the pH in the semi-batch reaction tank 10 is measured by the pH meter 40. Further, the control device 20 monitors the pH value in the semi-batch type reaction tank 10 measured by the pH meter 40 at every predetermined time, and adjusts the time of the biological treatment process as described later. When the adjusted biological treatment process time is reached, for example, the aeration pump 14 is stopped by the control device 20 (the stirring device is also stopped in the granule forming tank 1 in FIG. 2).
＜（３）沈降工程＞
曝気用ポンプ１４の停止後、所定の時間、静置状態にすることで半回分式反応槽１０内の汚泥を沈降させる。
<(3) Sedimentation process>
After stopping the aeration pump 14, the sludge in the semi-batch reaction tank 10 is settled by leaving it in a stationary state for a predetermined time.
＜（４）排出工程＞
生物処理水排出バルブ１８を開けることで、沈降工程で得られた上澄み水を生物処理水として生物処理水排出口１６から生物処理水配管２４を通して排出する。この場合、生物処理水排出バルブではなく、ポンプを用いて生物処理水を排出してもよい。
<(4) Discharging process>
By opening the biological treated water discharge valve 18, the supernatant water obtained in the sedimentation step is discharged as biological treated water from the biological treated water discharge port 16 through the biological treated water pipe 24. In this case, the biologically treated water may be discharged using a pump instead of the biologically treated water discharge valve.
以上の（１）〜（４）のサイクルを繰り返すことにより、微生物が緻密に集合し粒状となった集合体であるグラニュールが形成される。なお、排水流入ポンプ１２、曝気用ポンプ１４、撹拌装置のモータ２８の作動および停止、生物処理水排出バルブ１８の開閉は、制御装置２０により制御してもよいし、作業者等が行ってもよい。 By repeating the above cycles (1) to (4), the granules, which are aggregates in which the microorganisms are densely aggregated to form a granule, are formed. The operation and stop of the drainage inflow pump 12, the aeration pump 14, the motor 28 of the stirring device, and the opening and closing of the biological treated water discharge valve 18 may be controlled by the control device 20 or may be performed by an operator or the like. Good.
半回分式反応槽１０で形成されるグラニュールとは、自己造粒が進んだ汚泥のことであり、例えば汚泥の平均粒径が０．２ｍｍ以上、もしくは沈降性指標であるＳＶＩ５が８０ｍＬ／ｇ以下の生物汚泥である。また、本実施形態では、グラニュールが形成されたか否かは、例えば汚泥の沈降性指標であるＳＶＩを測定することにより判断される。具体的には、定期的に半回分式反応槽１０内の汚泥の沈降性試験によりＳＶＩ値を測定し、５分沈降後の体積割合から算出されるＳＶＩ５の値が所定値以下（例えば８０ｍＬ／ｇ以下）となった段階で、グラニュールが形成されたと判断することが可能である。もしくは、半回分式反応槽１０内の汚泥の粒径分布を測定し、その平均粒径が所定値以上（例えば０．２ｍｍ以上）となった段階で、グラニュールが形成されたと判断することが可能である（なお、ＳＶＩ値が低いほど、平均粒径が大きいほど良好なグラニュールであると判断可能である）。 The granules formed in the semi-batch type reaction tank 10 are sludges that have undergone self-granulation. For example, the average particle size of the sludge is 0.2 mm or more, or SVI5 that is a sedimentation index is 80 mL/g. The following biological sludge. Further, in the present embodiment, whether or not granules are formed is determined by, for example, measuring SVI which is a sludge sedimentation index. Specifically, the SVI value is periodically measured by a sedimentation test of sludge in the semi-batch type reaction tank 10, and the value of SVI5 calculated from the volume ratio after sedimentation for 5 minutes is a predetermined value or less (for example, 80 mL/ It is possible to determine that the granules have been formed at the stage of (g or less). Alternatively, the particle size distribution of the sludge in the semi-batch type reaction tank 10 may be measured, and when the average particle size becomes a predetermined value or more (for example, 0.2 mm or more), it may be determined that granules are formed. It is possible (it can be judged that the smaller the SVI value and the larger the average particle diameter, the better the granules).
＜生物処理工程の時間調整＞
半回分式反応槽におけるグラニュール汚泥の形成は、１サイクルにおける反応槽内の有機物濃度勾配を繰り返すことが重要であり、反応槽内でのＢＯＤ濃度が高い時間（飽食時間）と、ＢＯＤ濃度がほとんど０となっている時間（飢餓時間）が必要であると考えられている。そのため、生物処理工程の時間は、飽食時間と飢餓時間がそれぞれ適切に確保されるように設定されることが望ましい。しかし、一般的に、生物処理工程の時間は最初に設定した時間で固定されるため、有機物含有排水のＢＯＤ濃度等が変動し、例えば飽食時間が長くなると、十分な飢餓時間を確保することができなくなり、また例えば飽食時間が短くなると、飢餓時間が非常に長くなったりして、良好なグラニュールの形成が困難になる場合がある。良好なグラニュールを形成する観点から、反応槽に投入される有機物含有排水のＢＯＤ濃度をモニタリングして、生物処理工程の時間調整を行うことが考えられるが、ＢＯＤ濃度の測定には時間が掛かるため、生物処理工程の時間調整にＢＯＤ濃度を用いることは現実的ではない。本実施形態では、半回分式反応槽内のｐＨをモニタリングして、生物処理工程の時間調整を行うことで、有機物含有排水のＢＯＤ濃度が変動しても、飽食時間と飢餓時間をそれぞれ適切に確保し、良好なグラニュールを形成することを可能とする。
<Time adjustment of biological treatment process>
For the formation of granule sludge in the semi-batch reaction tank, it is important to repeat the organic substance concentration gradient in the reaction tank in one cycle, and the BOD concentration in the reaction tank is high (saturation time) and the BOD concentration is high. It is considered necessary to have a time (starvation time) that is almost zero. Therefore, it is desirable that the time of the biological treatment step is set so that the satiety time and the starvation time are appropriately secured. However, in general, the time of the biological treatment step is fixed at the initially set time, so that if the BOD concentration of the organic matter-containing wastewater fluctuates and, for example, the satiety time becomes long, sufficient starvation time can be secured. When it becomes impossible, and the satiety time becomes short, for example, the starvation time becomes very long, which may make it difficult to form good granules. From the viewpoint of forming good granules, it may be possible to monitor the BOD concentration of the organic matter-containing wastewater introduced into the reaction tank and adjust the time of the biological treatment process, but it takes time to measure the BOD concentration. Therefore, it is not realistic to use the BOD concentration for the time adjustment of the biological treatment process. In the present embodiment, by monitoring the pH in the semi-batch type reaction tank and adjusting the time of the biological treatment step, even if the BOD concentration of the organic matter-containing wastewater varies, the satiation time and the starvation time are appropriately adjusted. It is possible to secure and form good granules.
図３は、生物処理工程中の半回分式反応槽内のｐＨの推移の一例を示す図である。図３に示すように、生物処理工程の初期の段階では、半回分式反応槽内のｐＨは上昇する。このｐＨ上昇は、主に有機物含有排水中の有機物の分解に起因するものであると考えられる。半回分式反応槽内のｐＨは上昇した後、変曲点Ａ（極大値）を経て低下する。このｐＨの低下は、主に有機物含有排水中の有機態窒素等の窒素化合物がアンモニア態窒素に還元され、また、アンモニア態窒素が硝酸、亜硝酸に酸化される際に消費されるアルカリ度に起因するものであると考えられる。そして、半回分式反応槽内のｐＨは低下した後、変曲点Ｂ（極小値）を経て上昇する。この再度のｐＨ上昇は、主に曝気装置により供給される空気等の酸素含有気体に起因するものであると考えられる。そして、生物処理工程の開始から変曲点Ｂまでの時間は、反応槽内でのＢＯＤ濃度が高い時間（飽食時間）に相当し、変曲点Ｂ以降の時間は、ＢＯＤ濃度がほとんど０となっている時間（飢餓時間）に相当する。 FIG. 3 is a diagram showing an example of changes in pH in the semi-batch type reaction tank during the biological treatment process. As shown in FIG. 3, in the early stage of the biological treatment process, the pH in the semi-batch type reaction vessel rises. It is considered that this increase in pH is mainly due to the decomposition of organic matter in the organic matter-containing wastewater. The pH in the semi-batch type reaction tank rises, then decreases after passing through the inflection point A (maximum value). This decrease in pH mainly depends on the alkalinity consumed when nitrogen compounds such as organic nitrogen in wastewater containing organic substances are reduced to ammonia nitrogen, and when ammonia nitrogen is oxidized to nitric acid and nitrous acid. It is considered to be due to this. Then, after the pH in the semi-batch type reaction tank is lowered, it rises through the inflection point B (minimum value). It is considered that this re-increasing pH is mainly due to the oxygen-containing gas such as air supplied by the aerator. The time from the start of the biological treatment process to the inflection point B corresponds to the time when the BOD concentration in the reaction tank is high (saturation time), and the time after the inflection point B is almost 0 BOD concentration. It corresponds to the time (starvation time).
本実施形態では、例えば制御装置２０によって、ｐＨ計４０により測定される半回分式反応槽１０内のｐＨ値を所定時間毎にモニタリングし、変曲点Ａ，Ｂ、生物処理工程の開始から変曲点Ａ，Ｂまでの時間のｐＨに関する情報を得る。そして、このｐＨに関する情報に基づいて、生物処理工程の時間が調整される。 In the present embodiment, for example, the control device 20 monitors the pH value in the semi-batch reaction tank 10 measured by the pH meter 40 at every predetermined time, and changes from the inflection points A and B, from the start of the biological treatment process. Obtain information about the pH of the time to the inflection points A and B. Then, the time of the biological treatment process is adjusted based on the information on the pH.
上記ｐＨに関する情報のうちでは、生物処理工程の開始から変曲点Ｂまでの時間に基づいて、生物処理工程の時間を調整することが好ましい。例えば、制御装置２０に予め生物処理工程の開始から変曲点Ｂまでの時間（飽食時間）／生物処理工程時間の割合を記憶させる。そして、ｐＨ計４０により測定されるｐＨを所定時間毎にモニタリングして、生物処理工程の開始から変曲点Ｂに達するまでの時間を計測し、上記割合から、生物処理工程時間を設定する。生物処理工程開始から上記設定した時間まで、曝気装置２６を作動させ、生物処理工程を行うことにより、半回分式反応槽１０に投入される有機物含有排水のＢＯＤ濃度が変動し、飽食時間が増減しても、適切な飢餓時間を確保することができるため、良好なグラニュールを形成することが可能となる。良好なグラニュール形成の観点から、生物処理工程の時間は、生物処理工程の開始から変曲点Ｂまでの時間に対して１．５〜２．５倍の範囲とすることが好ましい。 Among the information on the pH, it is preferable to adjust the time of the biological treatment process based on the time from the start of the biological treatment process to the inflection point B. For example, the control device 20 stores in advance the ratio of the time from the start of the biological treatment process to the inflection point B (satiated time)/the biological treatment process time. Then, the pH measured by the pH meter 40 is monitored every predetermined time, the time from the start of the biological treatment process to the point of inflection B is measured, and the biological treatment process time is set from the above ratio. By operating the aeration device 26 from the start of the biological treatment process to performing the biological treatment process, the BOD concentration of the organic matter-containing wastewater fed into the semi-batch type reaction tank 10 changes, and the satiety time increases or decreases. Even so, since it is possible to secure an appropriate starvation time, it becomes possible to form good granules. From the viewpoint of good granule formation, the time of the biological treatment step is preferably in the range of 1.5 to 2.5 times the time from the start of the biological treatment step to the inflection point B.
また、生物処理工程の開始から変曲点Ａまでの時間を基に、おおよその飽食時間が推定されるため、生物処理工程の開始から変曲点Ａまでの時間に基づいて、生物処理工程の時間を調整してもよい。例えば、制御装置２０に予め生物処理工程の開始から変曲点Ａまでの時間／生物処理工程時間の割合を記憶させる。そして、ｐＨ計４０により測定されるｐＨを所定時間毎にモニタリングして、生物処理工程の開始から変曲点Ａに達するまでの時間を計測し、上記割合から、生物処理工程時間を設定してもよい。良好なグラニュール形成の観点から、生物処理工程の時間は、生物処理工程の開始から変曲点Ａまでの時間に対して５〜２５倍の範囲とすることが好ましい。 In addition, since the approximate satiation time is estimated based on the time from the start of the biological treatment process to the inflection point A, the biological treatment process is estimated based on the time from the start of the biological treatment process to the inflection point A. You may adjust the time. For example, the control device 20 stores in advance the ratio of the time from the start of the biological treatment process to the inflection point A/the biological treatment process time. Then, the pH measured by the pH meter 40 is monitored every predetermined time, the time from the start of the biological treatment process to the point of inflection A is measured, and the biological treatment process time is set from the above ratio. Good. From the viewpoint of good granule formation, the time of the biological treatment step is preferably in the range of 5 to 25 times the time from the start of the biological treatment step to the inflection point A.
半回分式反応槽１０の容積負荷は、０．１５ｋｇＢＯＤ／ｍ３／日〜１.００ｋｇＢＯＤ／ｍ３／日の範囲であることが好ましく、０．３０ｋｇＢＯＤ／ｍ３／日〜０．６０ｋｇＢＯＤ／ｍ３／日の範囲がより好ましい。半回分式反応槽１０の容積負荷を上記範囲とすることにより、より良好なグラニュールを形成することが可能となる。 Volume loading of the semi-batch reaction vessel 10 is preferably in the range of 0.15kgBOD / m 3 / day ~1.00kgBOD / m 3 / day, 0.30kgBOD / m 3 / day ~0.60kgBOD / m A range of 3 /day is more preferred. By setting the volumetric load of the semi-batch type reaction tank 10 within the above range, it becomes possible to form better granules.
半回分式反応槽１０の汚泥負荷は、０.０５ｋｇＢＯＤ／ｋｇＭＬＳＳ／日〜０.３０ｋｇＢＯＤ／ｋｇＭＬＳＳ／日の範囲であることが好ましく、０.１０ｋｇＢＯＤ／ｋｇＭＬＳＳ／日〜０.２０ｋｇＢＯＤ／ｋｇＭＬＳＳ／日の範囲がより好ましい。半回分式反応槽１０の汚泥負荷を上記範囲とすることにより、より良好なグラニュールを形成することが可能となる。 The sludge load of the semi-batch type reaction tank 10 is preferably in the range of 0.05 kgBOD/kgMLSS/day to 0.30 kgBOD/kgMLSS/day, and 0.10 kgBOD/kgMLSS/day to 0.20 kgBOD/kgMLSS/day. A range is more preferable. By setting the sludge load of the semi-batch type reaction tank 10 within the above range, it becomes possible to form better granules.
半回分式反応槽１０内の溶存酸素（ＤＯ）は、好気条件では、０．５ｍｇ／Ｌ以上、特に１ｍｇ／Ｌ以上とすることが好ましい。 The dissolved oxygen (DO) in the semi-batch type reaction tank 10 is preferably 0.5 mg/L or more, particularly preferably 1 mg/L or more under aerobic conditions.
生物汚泥のグラニュール化を促進させる点で、半回分式反応槽１０内の有機物含有排水または半回分式反応槽１０に導入される前の有機物含有排水に、Ｆｅ２＋、Ｆｅ３＋、Ｃａ２＋、Ｍｇ２＋等を含む、水酸化物が形成されるようなイオンを添加することが好ましい。通常の有機物含有排水には、グラニュールの核となるような微粒子が含まれているが、上記イオンの添加により、グラニュールの核形成をより促進させることが可能となる。 In terms of promoting granulation of biological sludge, Fe 2+ , Fe 3+ , Ca 2+ are added to the organic matter-containing wastewater in the semi-batch reaction tank 10 or the organic matter-containing waste water before being introduced into the semi-batch reaction tank 10. It is preferable to add ions such as Mg 2+ that form a hydroxide. The normal organic matter-containing wastewater contains fine particles that serve as granule nuclei, but the addition of the above-mentioned ions makes it possible to further promote the formation of granule nuclei.
本実施形態に係るグラニュール形成方法の処理対象となる有機物含有排水は、食品加工工場排水、化学工場排水、半導体工場排水、機械工場排水、下水、し尿等の生物分解性有機物を含有する有機性排水である。また、生物難分解性の有機物が含有されている場合、予めオゾン処理やフェントン処理等の物理化学的処理を施し、生物分解性の成分に変換することで処理対象とすることができる。また、本実施形態に係るグラニュール形成方法はさまざまなＢＯＤ成分を対象としているが、油脂分に関しては、汚泥やグラニュールに付着して悪影響を及ぼす場合があるため、半回分式反応槽１０へと導入される前に、予め浮上分離、凝集加圧浮上、吸着等の既存の手法にて例えば１５０ｍｇ／Ｌ以下程度にまで除去しておくことが好ましい。 Organic matter-containing wastewater to be treated by the granule forming method according to the present embodiment is an organic matter containing biodegradable organic matter such as food processing factory wastewater, chemical factory wastewater, semiconductor factory wastewater, machine factory wastewater, sewage, night soil, etc. It is drainage. Further, in the case where the biodegradable organic substance is contained, it can be treated by subjecting it to physicochemical treatment such as ozone treatment or Fenton treatment in advance and converting it into a biodegradable component. Further, although the granule forming method according to the present embodiment is intended for various BOD components, since the oil and fat may adhere to sludge or granules and adversely affect the semi-batch reaction tank 10, Before being introduced, it is preferable to remove it to a level of, for example, 150 mg/L or less by an existing method such as flotation, flocculation and pressure flotation, and adsorption.
本実施形態に係るグラニュールの形成装置の他の例を図４に示す。図４のグラニュール形成装置１において、排水供給配管２２が排水流入ポンプ１２、排水流入バルブ３２を介して半回分式反応槽１０の下部の排水流入口３４に接続されている。排水流入口３４には、排水排出部３６が接続されて、半回分式反応槽１０の内部の下部に設置されている。半回分式反応槽１０の生物処理水排出口１６は排水流入口３４よりも上方に設けられ、生物処理水排出口１６に生物処理水配管２４が生物処理水排出バルブ１８を介して接続されている。生物処理水排出口１６は排水流入口３４よりも上方に設けられているが、流入する有機物含有排水の短絡を防ぎ、より効率的にグラニュールを形成させるためには排水流入口３４からできるだけ離れて設置されていることが好ましく、沈降工程における水面位に設けられることがより好ましい。排水流入ポンプ１２、排水流入バルブ３２、生物処理水排出バルブ１８、曝気用ポンプ１４、撹拌装置のモータ２８、ｐＨ計４０は、それぞれ制御装置２０と電気的接続されている。その他は、図２のグラニュール形成装置１と同様の構成である。 Another example of the granule forming apparatus according to the present embodiment is shown in FIG. In the granule forming apparatus 1 of FIG. 4, the drainage supply pipe 22 is connected to the drainage inlet 34 at the bottom of the semi-batch reaction tank 10 via the drainage inflow pump 12 and the drainage inflow valve 32. A drainage discharge part 36 is connected to the drainage inlet 34, and is installed in the lower part inside the semi-batch type reaction tank 10. The biological treated water discharge port 16 of the semi-batch type reaction tank 10 is provided above the drainage inlet 34, and the biological treated water pipe 24 is connected to the biological treated water discharge port 16 via the biological treated water discharge valve 18. There is. The biological treated water outlet 16 is provided above the drainage inlet 34, but in order to prevent short-circuiting of the inflowing organic matter-containing drainage and to form granules more efficiently, it is as far as possible from the drainage inlet 34. It is preferable that it is installed in the water level in the sedimentation step. The waste water inflow pump 12, the waste water inflow valve 32, the biological treated water discharge valve 18, the aeration pump 14, the motor 28 of the stirring device, and the pH meter 40 are electrically connected to the control device 20, respectively. The other configurations are the same as those of the granule forming apparatus 1 of FIG.
図４のグラニュール形成装置１では、（４）排出工程において、排水流入バルブ３２を開けて排水流入ポンプ１２を作動し、有機物含有排水を排水流入口３４から排水供給配管２２を通して排水排出部３６から半回分式反応槽１０に流入させることにより、生物処理水を生物処理水排出口１６から生物処理水配管２４を通して排出する。なお、排水流入ポンプ１２、曝気用ポンプ１４、撹拌装置のモータ２８の作動および停止、排水流入バルブ３２、生物処理水排出バルブ１８の開閉は、制御装置２０により制御してもよいし、作業者等が行ってもよい。 In the granule forming apparatus 1 of FIG. 4, in the discharge step (4), the wastewater inflow valve 32 is opened to operate the wastewater inflow pump 12, and the organic matter-containing wastewater is discharged from the wastewater inlet 34 through the wastewater supply pipe 22 to the wastewater discharge part 36. The biological treated water is discharged from the biological treated water outlet 16 through the biological treated water pipe 24 by flowing the treated biological water into the semi-batch reaction tank 10. The operation and stop of the drainage inflow pump 12, the aeration pump 14, the agitator motor 28, and the opening and closing of the wastewater inflow valve 32 and the biological treated water discharge valve 18 may be controlled by the control device 20. And so on.
このように、図４のグラニュール形成装置１では、（１）流入工程／排出工程、（２）生物処理工程、（３）沈降工程という３つのサイクルを繰り返すことにより、グラニュールが形成される。そして、（２）生物処理工程の時間は、前述したように、ｐＨ計４０により測定される半回分式反応槽１０内のｐＨ値を所定時間毎にモニタリングし、そのｐＨに関する情報に基づいて、調整される。 As described above, in the granule forming apparatus 1 of FIG. 4, granules are formed by repeating three cycles of (1) inflow process/exhaust process, (2) biological treatment process, and (3) sedimentation process. .. Then, (2) the time of the biological treatment step, as described above, the pH value in the semi-batch reaction tank 10 measured by the pH meter 40 is monitored every predetermined time, based on the information on the pH, Adjusted.
図４のグラニュール形成装置１では、有機物含有排水を半回分式反応槽１０に流入させることにより生物処理水を生物処理水排出口１６から排出させているため、粒径が比較的小さいグラニュールが生物処理水とともに排出され、粒径が比較的大きいグラニュールについて（１）〜（３）のサイクルが繰り返される。その結果、より効率的にグラニュールを形成することができる。 In the granule forming apparatus 1 of FIG. 4, since the biologically treated water is discharged from the biologically treated water discharge port 16 by causing the organic matter-containing wastewater to flow into the semi-batch reaction tank 10, the granules having a relatively small particle size are used. Are discharged together with the biologically treated water, and the cycles (1) to (3) are repeated for granules having a relatively large particle size. As a result, granules can be formed more efficiently.
以下、実施例および比較例を挙げ、本発明をより具体的に詳細に説明するが、本発明は、以下の実施例に限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
反応槽有効容積４Ｌ（縦１４０ｍｍ×横７０ｍｍ×高さ４１０ｍｍ）の半回分式反応槽を用いて下記の試験を行った。半回分式反応槽において生物処理水排出口を沈降工程における水面位置に設置した。 The following test was conducted using a semi-batch type reaction tank having a reaction tank effective volume of 4 L (length 140 mm x width 70 mm x height 410 mm). In the semi-batch type reaction tank, the biological treated water outlet was installed at the water surface position in the sedimentation process.
通水試験には下水を使用した。下水のＢＯＤ濃度は７０〜１８０ｍｇ／Ｌであった。排水のＢＯＤ濃度はＪＩＳ Ｋ ０１０２ ２１に準拠して測定した。 Sewage was used for the water flow test. The BOD concentration of sewage was 70 to 180 mg/L. The BOD concentration of the wastewater was measured according to JIS K 010221.
［実施例］
半回分式反応槽の運転サイクルは下記のように行った。なお、運転前に、下水処理場から採取した活性汚泥を種汚泥として半回分式反応槽に投入した。
（１）流入／排出工程：排水を１５分かけて半回分式反応槽に流入させるとともに、生物処理水排出口（排水の流入開始と同時に開となる電動弁を設置）より生物処理水を排出させた（図４参照）。
（２）生物処理工程：排水の流入を停止させると同時に生物処理水排出バルブを閉とし、反応槽下部に設置した曝気装置より空気を供給した。反応槽のｐＨを１分おきにモニタリングし、ｐＨが２回連続で低下した後２回連続で上昇した時点より２分前の時点を変曲点の時刻（図３に示す変曲点Ｂの時刻）とした。そして、生物処理工程の開始（空気供給開始時点）から変曲点までの時間に対して２倍の時間を生物処理工程の時間として運転を行い、当該時間経過後、以下の沈降工程へ移行した。
（３）沈降工程：曝気装置からの空気の供給を停止させて１５分間静置させ、反応槽内の汚泥を沈降させた。
以上（１）〜（３）の操作を繰り返しながら、３０日間の連続運転を行った。
[Example]
The operation cycle of the semi-batch type reaction tank was performed as follows. Before the operation, the activated sludge collected from the sewage treatment plant was put into the semi-batch reaction tank as seed sludge.
(1) Inflow/exhaust process: The wastewater is made to flow into the semi-batch type reaction tank over 15 minutes, and the biologically treated water is discharged from the biologically treated water outlet (the motorized valve that opens at the start of the inflow of the wastewater is installed) (See FIG. 4).
(2) Biological treatment process: At the same time as stopping the inflow of waste water, the biological treated water discharge valve was closed, and air was supplied from the aeration device installed at the bottom of the reaction tank. The pH of the reaction tank was monitored every 1 minute, and the time point of the inflection point was measured 2 minutes before the time point when the pH value decreased twice in a row and then increased twice in a row (at the inflection point B in FIG. 3). Time). Then, the operation was performed with the time of the biological treatment step being twice as long as the time from the start of the biological treatment step (at the time when the air supply was started) to the inflection point, and after the lapse of the time, the operation proceeded to the sedimentation step below. ..
(3) Sedimentation step: The supply of air from the aeration device was stopped and the mixture was allowed to stand for 15 minutes to sediment the sludge in the reaction tank.
While repeating the above operations (1) to (3), continuous operation was performed for 30 days.
［比較例］
半回分式反応槽の運転サイクルは下記のように行った。なお、運転前に、下水処理場から採取した活性汚泥を種汚泥として半回分式反応槽に投入した。
（１）流入／排出工程：排水を１５分かけて半回分式反応槽に流入させるとともに、生物処理水排出口（排水の流入開始と同時に開となる電動弁を設置）より生物処理水を排出させた（図４参照）。
（２）生物処理工程：排水の流入を停止させると同時に生物処理水排出バルブを閉とし、反応槽下部に設置した曝気装置より空気を供給した。排水のＢＯＤ濃度の変動（７０〜１８０ｍｇ／Ｌ）に関わらず、生物処理工程の時間を２４０分に固定して運転を行い、２４０分後、以下の沈降工程へ移行した。
（３）沈降工程：曝気装置からの空気の供給を停止させて１５分間静置させ、反応槽内の汚泥を沈降させた。
以上（１）〜（３）の操作を繰り返しながら、３０日間の連続運転を行った。
[Comparative example]
The operation cycle of the semi-batch type reaction tank was performed as follows. Before the operation, the activated sludge collected from the sewage treatment plant was put into the semi-batch type reaction tank as seed sludge.
(1) Inflow/exhaust process: The wastewater is allowed to flow into the semi-batch type reaction tank over 15 minutes, and the bioprocessed water is discharged from the bioprocessed water outlet (installed an electric valve that opens simultaneously with the start of the inflow of the wastewater). (See FIG. 4).
(2) Biological treatment process: At the same time as stopping the inflow of waste water, the biological treated water discharge valve was closed, and air was supplied from the aeration device installed at the bottom of the reaction tank. Regardless of fluctuations in the BOD concentration of the wastewater (70 to 180 mg/L), the biological treatment step was performed with the time fixed at 240 minutes, and 240 minutes later, the process proceeded to the sedimentation step below.
(3) Sedimentation step: The supply of air from the aeration device was stopped and the mixture was allowed to stand for 15 minutes to sediment the sludge in the reaction tank.
While repeating the above operations (1) to (3), continuous operation was performed for 30 days.
実施例及び比較例ともに、半回分式反応槽内の生物汚泥のＳＶＩ３０測定によりグラニュールの形成を評価した。なお、ＳＶＩ３０とは、生物汚泥の沈降性指標であり、以下の方法により求められる。まず、１Ｌのメスシリンダに１Ｌの汚泥を投入し、汚泥濃度ができるだけ均一となるように緩やかに撹拌した後、３０分間静置したときの汚泥界面を測定する。そして、メスシリンダにおける汚泥の占める体積率（％）を計算する。次に、汚泥のＭＬＳＳ（ｍｇ／Ｌ）を測定する。これらを下記式に当てはめて、ＳＶＩ３０を算出する。ＳＶＩ３０の値が小さいほど、沈降性が高い汚泥であることを示している。
ＳＶＩ３０（ｍＬ／ｇ）＝汚泥の占める体積率×１０，０００／ＭＬＳＳ
In both Examples and Comparative Examples, the formation of granules was evaluated by SVI 30 measurement of biological sludge in a semi-batch type reaction tank. In addition, SVI 30 is a sedimentation index of biological sludge and is obtained by the following method. First, 1 L of sludge is put into a 1 L graduated cylinder, gently stirred so that the sludge concentration is as uniform as possible, and then the sludge interface is measured when left standing for 30 minutes. Then, the volume ratio (%) occupied by the sludge in the graduated cylinder is calculated. Next, the MLSS (mg/L) of the sludge is measured. These are applied to the following formula to calculate SVI 30 . A smaller value of SVI 30 indicates that the sludge has a higher sedimentation property.
SVI 30 (mL/g)=volume ratio of sludge×10,000/MLSS
表１に、実施例及び比較例のＳＶＩ３０の結果をまとめた。 Table 1 summarizes the results of SVI 30 of Examples and Comparative Examples.
実施例、比較例ともに、ＳＶＩ３０の低下が見られたが、実施例の方がより低い値となった。すなわち、実施例の方が、汚泥の沈降性が向上し、より良好なグラニュールが形成された。 A decrease in SVI 30 was observed in both the example and the comparative example, but the value was lower in the example. That is, in the example, the settling property of sludge was improved, and better granules were formed.
１ グラニュール形成装置、１０ 半回分式反応槽、１２ 排水流入ポンプ、１４ 曝気用ポンプ、１６ 生物処理水排出口、１８ 生物処理水排出バルブ、２０ 制御装置、２２ 排水供給配管、２４ 生物処理水配管、２６ 曝気装置、２８ モータ、３０ 撹拌翼、３２ 排水流入バルブ、３４ 排水流入口、３６ 排水排出部、４０ ｐＨ計。 1 granule forming device, 10 semi-batch type reaction tank, 12 wastewater inflow pump, 14 aeration pump, 16 biological treated water discharge port, 18 biological treated water discharge valve, 20 control device, 22 wastewater supply pipe, 24 biological treated water Piping, 26 aeration device, 28 motor, 30 stirring blades, 32 drainage inflow valve, 34 drainage inlet, 36 drainage outlet, 40 pH meter.
Claims (3)
前記生物処理工程では、前記半回分式反応槽内のｐＨをモニタリングし、前記生物処理工程の開始から、ｐＨが上昇した後低下する変曲点Ａまでの時間に対して５〜２５倍の範囲、または前記生物処理工程の開始から、ｐＨが低下した後上昇する変曲点Ｂまでの時間に対して１．５〜２．５倍の範囲で、前記生物処理工程の時間を設定し、設定した時間まで生物処理を行うことを特徴とするグラニュールの形成方法。 An inflow step of inflowing organic matter-containing wastewater, under aerobic conditions, a biological treatment step of biologically treating the substance to be treated in the organic matter-containing wastewater with microbial sludge, a sedimentation step of settling the microbial sludge, and A method for forming granules using a semi-batch type reaction tank, wherein a discharging step for discharging biologically treated biologically treated water is repeated to form granules,
In the biological treatment step, the pH in the semi-batch type reaction vessel is monitored, and the range from 5 to 25 times the time from the start of the biological treatment step to the inflection point A where the pH increases and then decreases. Or, the time of the biological treatment step is set and set within a range of 1.5 to 2.5 times the time from the start of the biological treatment step to the inflection point B where the pH decreases and then rises. A method for forming granules, which comprises performing biological treatment for up to a predetermined time.
前記半回分式反応槽内のｐＨをモニタリングし、前記生物処理工程の開始から、ｐＨが上昇した後低下する変曲点Ａまでの時間に対して５〜２５倍の範囲、または前記生物処理工程の開始から、ｐＨが低下した後上昇する変曲点Ｂまでの時間に対して１．５〜２．５倍の範囲で、前記生物処理工程の時間を設定する制御部と、を備え、
前記半回分式反応槽では、前記設定した時間まで前記生物処理工程を行うことを特徴とするグラニュールの形成装置。 An inflow step of inflowing organic matter-containing wastewater, under aerobic conditions, a biological treatment step of biologically treating the substance to be treated in the organic matter-containing wastewater with microbial sludge, a sedimentation step of settling the microbial sludge, and A semi-batch type reaction tank that forms a granule by repeatedly performing a discharge step of discharging biologically treated biologically treated water,
The pH in the semi-batch type reaction tank is monitored, and the range from 5 to 25 times the time from the start of the biological treatment step to the inflection point A where the pH increases and then decreases, or the biological treatment step From the start of the, to the inflection point B that rises after the pH decreases, in the range of 1.5 to 2.5 times, a control unit that sets the time of the biological treatment step,
The apparatus for forming granules, wherein the biological treatment step is performed in the semi-batch type reaction tank until the set time.
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