JP3722497B2 - Biological treatment method and biological treatment apparatus for nitrogen-containing polluted water - Google Patents

Biological treatment method and biological treatment apparatus for nitrogen-containing polluted water Download PDF

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JP3722497B2
JP3722497B2 JP10290494A JP10290494A JP3722497B2 JP 3722497 B2 JP3722497 B2 JP 3722497B2 JP 10290494 A JP10290494 A JP 10290494A JP 10290494 A JP10290494 A JP 10290494A JP 3722497 B2 JP3722497 B2 JP 3722497B2
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nitrogen
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bacteria
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JPH07308694A (en
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清一 ▲はま▼上
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Honda Motor Co Ltd
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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
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Description

【０００１】
【産業上の利用分野】
本発明は、例えば生活排水を生物処理する際、窒素を効率的に除去し得る生物処理方法及び処理装置に関する。
【０００２】
【従来の技術】
従来、生活排水等の窒素含有汚濁水から生物処理によって窒素を除去するような技術として、例えば、Barthらによって開発された３段分離法が知られている。
【０００３】
この方法は、図２に示すように、生活排水を第１沈殿槽５１に導いて異物の沈殿除去を行い、異物の除去された生活排水を高速酸化槽５２に導入してＢＯＤ成分酸化菌によってＢＯＤ（biochemical oxygen demand）物質（水中の溶存酸素を消費する物質）の酸化除去を行う。この際、アンモニア態窒素（ＮＨ4 +）は酸化されて亜硝酸（ＮＯ2 -）に変化する。
【０００４】
次に第２沈殿槽５３において、ＢＯＤ成分酸化菌を含有する汚泥と処理排水との分離を行い、ＢＯＤ成分酸化菌を含有する汚泥をＢＯＤ成分酸化菌回収配管５４を介して高速酸化槽５２に回収した後、処理排水を硝化槽５５で硝酸菌によって生物処理すると、亜硝酸（ＮＯ2 -）は硝酸態窒素（ＮＯ3 -）まで変化する。
【０００５】
そして、第３沈殿槽５６において、硝酸菌を含有する汚泥と処理排水との分離を行い、硝酸菌を含有する汚泥を硝酸菌回収配管５７を介して硝化槽５５に回収した後、処理排水を脱窒槽５８に導き、ここでは今までの工程で殆ど消費し尽くした有機物、特に脱窒菌の合成材料である炭素源を補充する。
【０００６】
つまり、例えばメタノール（ＣＨ3ＯＨ）等の有機性炭素源を補充し、これを利用して硝酸を還元して窒素ガスとして空中に放出し、脱窒素を完了する。
そして、次の最終沈殿槽５９において脱窒菌を含有する汚泥と処理排水との分離が行われ、脱窒菌を含有する汚泥は脱窒菌回収配管６０を介して脱窒槽５８に回収される。
【０００７】
そして、処理排水は処理水槽６１においてＢＯＤ、ＣＯＤ（chemical oxygen demand）、ＰＨ等のチェックを行い、一般環境下へ排水される。
尚、高速酸化槽５２、硝化槽５５での反応は好気性条件下であり、脱窒槽５８での反応は嫌気性条件下である。
【０００８】
【発明が解決しようとする課題】
ところが、かかる従来方法の場合、一度ＢＯＤを除去した処理排水に再度メタノール等の有機炭素源を添加するという矛盾があり、ＢＯＤの厳しい環境規制の面からシビアにコントロールする必要があるばかりでなく、装置も高度な性能のものが要求される。
【０００９】
また、装置も高速酸化槽、硝化槽、脱窒槽の３種類の槽、及び３種類の回収配管が必要で大型化するとともに、高速酸化槽と硝化槽の反応は好気性条件下での反応であり、脱窒槽の反応は嫌気性条件下での反応であるため、各槽における条件のコントロールが煩雑になるという問題があった。
【００１０】
【課題を解決するための手段】
本発明は、上記不具合を解消するためなされたものであり、窒素含有汚濁水中のＢＯＤと窒素の含有率の実態に着目した。
【００１１】
すなわち、窒素含有汚濁水を生物処理する生物処理方法において、汚濁水中のＢＯＤと窒素の濃度が重量比で１００：５〜６．５となるように窒素を基準としてＢＯＤを添加し、好気性条件下で高負荷曝気槽及び曝気槽中の微生物濃度を３，０００〜６，０００ mg ／リットル範囲に保つようにし、定期的に、増殖するＢＯＤ成分酸化菌又は硝酸菌を脱水廃棄することにより生物処理するようにした。
【００１２】
また、生物処理装置において、汚濁水から異物を沈殿除去させる第１沈殿槽と、この第１沈殿槽に続く原水槽に取付けられた測定装置により検出したＢＯＤと窒素の濃度に基づいて重量比でＢＯＤ：窒素を１００：５〜６．５となるように窒素を基準としてＢＯＤを添加する原水槽と、ＢＯＤを添加した汚濁水を好気性条件下でＢＯＤ成分酸化菌又は硝酸菌で生物処理する高負荷曝気槽及び曝気槽と、生物処理した汚濁水とＢＯＤ成分酸化菌又は硝酸菌を含む汚泥とを分離する第２沈殿槽を設け、分離したＢＯＤ成分酸化菌又は硝酸菌を含む汚泥を前記高負荷曝気槽及び曝気槽に返送し、好気性条件下で前記高負荷曝気槽及び曝気槽中の微生物濃度を３，０００〜６，０００ mg ／リットル範囲に保つようにし、定期的に、増殖するＢＯＤ成分酸化菌又は硝酸菌を脱水廃棄するとともに、生物処理した汚濁水を外部に排水するようにした。
【００１３】
【作用】
ＢＯＤを生物処理で除去する時の有機排水中のＢＯＤと窒素の一般的な消費関係は、１００：５（重量比）であることは広く知られている。
一方、実際の有機排水中の含有窒素量は、上記消費率より格段に多い。
【００１４】
そこで、窒素を除去するにあたり、上記消費関係に基づき実際の窒素含有量を基準にしてＢＯＤの量を増加させて確実に窒素を除去するよう図る。
【００１５】
ここで、ＢＯＤ物質（水中の溶存酸素を消費する物質）は、ａ．好気性菌によって分解される有機性物質と、ｂ．硝化菌によって硝化されるアンモニア態窒素、亜硝酸態窒素などがあるが、本案でのＢＯＤの量の増加は、メチルアルコール又はエチルアルコール等の有機炭素源の補充により、またはＢＯＤの高い他の水を利用するようにしている。
【００１６】
そして、好気性条件下でＢＯＤ成分酸化菌又は硝酸菌により生物処理し、高負荷曝気槽と曝気槽の２段曝気により窒素（主にアンモニアまたは硝酸態窒素）をＢＯＤ成分酸化菌又は硝酸菌内に効率良く取り込む。
【００１７】
そして、定期的に増殖したＢＯＤ成分酸化菌又は硝酸菌を脱水廃棄（焼却又は埋立て処理）して、例えば処理排水中の窒素濃度を１０mg/リットル以下にする。
【００１８】
【実施例】
本発明の窒素含有汚濁水の生物処理方法及び生物処理装置の実施例について添付した図面に基づき説明する。
図１は本発明の生物処理を示す処理工程図である。
【００１９】
本発明の生物処理は、すべての工程を好気性条件下で処理出来るようにしたものであり、図１に示すように、生活排水を第１沈殿槽１に導いて異物を沈殿除去させた後、原水槽２において濃度測定を行うようにしている。
【００２０】
すなわち、原水槽２には、ＢＯＤ濃度と窒素濃度を測定することの出来る測定装置３が設けられており、この測定装置３によって測定したＢＯＤ濃度と窒素濃度の測定結果に基づき、両者の一般的な消費関係を基準にして不足分のＢＯＤ（有機炭素源）をメチルアルコール又はエチルアルコールなどを補充することで補う。
【００２１】
そして実施例の場合、原水槽２中のＢＯＤ濃度と窒素濃度が夫々２００mg/リットルと４０mg/リットル、つまりＢＯＤ：窒素が１００：２０であった。
そこで各条件での効果を確認するため、実施例ではメチルアルコール等の有機炭素源の補充量を変えて、ＢＯＤ濃度が５００mg/リットル（ＢＯＤ：窒素＝１００：８）、６００mg/リットル（ＢＯＤ：窒素＝１００：６．７）、７００mg/リットル（ＢＯＤ：窒素＝１００：５．７）、８００mg/リットル（ＢＯＤ：窒素＝１００：５）、８５０mg/リットル（ＢＯＤ：窒素＝１００：４．７）となるよう５種のサンプルで実験した。
【００２２】
次に、各サンプルごと高負荷曝気槽４においてエアレーション法と液中攪拌を併用し、高速曝気を行う。そしてこの曝気は汚泥が沈降しないよう充分な曝気強度で行い、同時にＢＯＤ成分酸化菌或いは硝酸菌により生物処理する。
そして、前記高負荷曝気槽４で処理した後のＢＯＤ濃度と窒素濃度の測定値を表１に示す。
【００２３】
【表１】

Figure 0003722497
【００２４】
次に、更に下流の曝気槽５でエアレーション法と液中攪拌によって曝気し、同様にＢＯＤ成分酸化菌或いは硝酸菌により生物処理する。
そして、同様に曝気槽５で処理した後のＢＯＤ濃度と窒素濃度の測定値も表１に示す。
【００２５】
次に、第２沈殿槽６でＢＯＤ成分酸化菌又は硝酸菌を含む汚泥と処理排水を分離し、ＢＯＤ成分酸化菌又は硝酸菌を含む汚泥はＢＯＤ成分酸化菌又は硝酸菌回収配管７を介して高負荷曝気槽４と曝気槽５に返送する。
そして、例えば高負荷曝気槽４及び曝気槽５中の微生物濃度を３，０００〜６，０００mg/リットル範囲に保つようにし、定期的に、増殖するＢＯＤ成分酸化菌又は硝酸菌を脱水廃棄する。
【００２６】
この際、高負荷曝気槽４への返送汚泥量は、除去したいＢＯＤ量により決まり、一定ではない。
【００２７】
一方、処理排水は処理槽８に導き、ＢＯＤ、ＣＯＤ、ＰＨ、全窒素等をチェックして一般環境下に排水する。
【００２８】
ここで、一般環境下に排水する処理排水のＢＯＤ及び全窒素の含有を１０mg/リットル以下に抑えようとする場合、前記表１から、ＢＯＤと窒素の重量濃度比を１００：５〜６．５にすることが必要であることが判る。
【００２９】
すなわち、ＢＯＤ１００mg/リットルに対して窒素の含有濃度が５mg/リットル以下であると、処理排水中のＢＯＤ濃度が１０mg/リットルを越えてしまう可能性があり、ＢＯＤ１００mg/リットルに対して窒素の含有濃度が６．５mg/リットル以上であると、処理排水中の窒素濃度が１０mg/リットルを越えてしまう可能性がある。
【００３０】
そして、かかる処理方法によって、好気性条件下だけで処理することが出来、条件設定等が容易になるとともに、装置の簡素化が可能である。
【００３１】
【発明の効果】
以上のように本発明の窒素含有汚濁水の生物処理方法及び装置は、従来のように一旦ＢＯＤを除去した処理排水に対して再度メタノール等の有機炭素源を添加していたような作業を無くすことが出来、しかも好気性条件下でのみ処理出来るため、各種条件を複雑にコントロールする必要もなくなる。
また、装置構成も従来のような複雑な処理槽を必要とせず、装置の小型化、簡素化が可能である。しかも安価に構成出来る。
【図面の簡単な説明】
【図１】本発明の生物処理の工程図
【図２】従来の生物処理の工程図
【符号の説明】
１ 第１沈殿槽
２ 原水槽
３ 測定装置
４ 高負荷曝気槽
５ 曝気槽
６ 第２沈殿槽
７ ＢＯＤ成分酸化菌又は硝酸菌回収配管[0001]
[Industrial application fields]
The present invention relates to a biological treatment method and a treatment apparatus that can efficiently remove nitrogen, for example, when biological wastewater is biologically treated.
[0002]
[Prior art]
Conventionally, for example, a three-stage separation method developed by Barth et al. Is known as a technique for removing nitrogen from nitrogen-containing polluted water such as domestic wastewater by biological treatment.
[0003]
In this method, as shown in FIG. 2, the domestic wastewater is guided to the first sedimentation tank 51 to remove the foreign matter, and the domestic wastewater from which the foreign matter has been removed is introduced into the high-speed oxidation tank 52 and is oxidized by the BOD component oxidizing bacteria. BOD (biochemical oxygen demand) substances (substances that consume dissolved oxygen in water) are removed by oxidation. At this time, ammonia nitrogen (NH 4 + ) is oxidized and converted into nitrous acid (NO 2 − ).
[0004]
Next, in the second sedimentation tank 53, the sludge containing the BOD component oxidizing bacteria is separated from the treated waste water, and the sludge containing the BOD component oxidizing bacteria is transferred to the high-speed oxidation tank 52 via the BOD component oxidizing bacteria recovery pipe 54. When the treated wastewater is biologically treated with nitric acid bacteria in the nitrification tank 55 after the recovery, nitrous acid (NO 2 − ) changes to nitrate nitrogen (NO 3 − ).
[0005]
Then, in the third settling tank 56, the sludge containing nitrate bacteria and the treated waste water are separated, and the sludge containing nitrate bacteria is recovered in the nitrification tank 55 via the nitrate bacteria recovery pipe 57, and then the treated waste water is discharged. The denitrification tank 58 is replenished here with organic substances that have been almost consumed in the process so far, particularly a carbon source that is a synthetic material for denitrification bacteria.
[0006]
That is, for example, an organic carbon source such as methanol (CH 3 OH) is replenished, and using this, nitric acid is reduced and released into the air as nitrogen gas to complete denitrification.
Then, the sludge containing denitrifying bacteria and the treated waste water are separated in the next final sedimentation tank 59, and the sludge containing denitrifying bacteria is collected in the denitrifying tank 58 via the denitrifying bacteria collection pipe 60.
[0007]
Then, the treated wastewater is checked in the treated water tank 61 for BOD, COD (chemical oxygen demand), PH, etc., and is discharged into the general environment.
The reaction in the high-speed oxidation tank 52 and the nitrification tank 55 is under aerobic conditions, and the reaction in the denitrification tank 58 is under anaerobic conditions.
[0008]
[Problems to be solved by the invention]
However, in the case of such a conventional method, there is a contradiction that an organic carbon source such as methanol is added again to the treated wastewater from which BOD has been once removed, and not only it is necessary to control severely from the viewpoint of strict environmental regulations of BOD, The equipment is also required to have high performance.
[0009]
The equipment also requires three types of tanks, a high-speed oxidation tank, a nitrification tank, and a denitrification tank, and three types of recovery pipes. The reaction between the high-speed oxidation tank and the nitrification tank is a reaction under aerobic conditions. In addition, since the reaction in the denitrification tank is a reaction under anaerobic conditions, there is a problem that the control of the conditions in each tank becomes complicated.
[0010]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and has focused on the actual content of BOD and nitrogen content in nitrogen-containing polluted water.
[0011]
That is, in the biological treatment method for biologically treating nitrogen-containing polluted water, BOD is added on the basis of nitrogen so that the concentration of BOD and nitrogen in the polluted water is 100: 5 to 6.5 by weight, and the aerobic condition By keeping the microorganism concentration in the high-load aeration tank and the aeration tank in the range of 3,000 to 6,000 mg / liter under the normal condition, the BOD component oxidizing bacteria or nitrate bacteria are periodically dehydrated and discarded. It was made to process.
[0012]
Moreover, in the biological treatment apparatus, the weight ratio is based on the concentration of BOD and nitrogen detected by the first sedimentation tank that precipitates and removes foreign substances from the polluted water, and the measurement apparatus attached to the raw water tank following the first sedimentation tank. BOD: Raw water tank to which BOD is added based on nitrogen so that nitrogen is 100: 5 to 6.5, and contaminated water to which BOD is added are biologically treated with BOD component oxidizing bacteria or nitrate bacteria under aerobic conditions A second settling tank is provided for separating the high-load aeration tank and the aeration tank, the biologically treated polluted water and the sludge containing BOD component oxidizing bacteria or nitrate bacteria, and the separated sludge containing BOD component oxidizing bacteria or nitrate bacteria is Return to the high-load aeration tank and the aeration tank, and maintain the microorganism concentration in the high-load aeration tank and the aeration tank in the range of 3,000 to 6,000 mg / liter under aerobic conditions. BOD component Oxidizing bacteria or nitrate bacteria were dehydrated and discarded , and biologically treated polluted water was drained to the outside.
[0013]
[Action]
It is well known that the general consumption relationship between BOD and nitrogen in organic wastewater when removing BOD by biological treatment is 100: 5 (weight ratio).
On the other hand, the amount of nitrogen contained in the actual organic wastewater is much larger than the above consumption rate.
[0014]
Therefore, when removing nitrogen, the amount of BOD is increased on the basis of the actual nitrogen content based on the above consumption relation, and nitrogen is surely removed.
[0015]
Here, the BOD substance (substance that consumes dissolved oxygen in water) is a. An organic substance that is degraded by aerobic bacteria; b. There are ammonia nitrogen and nitrite nitrogen that are nitrified by nitrifying bacteria, but the increase in the amount of BOD in this proposal is due to supplementation of organic carbon sources such as methyl alcohol or ethyl alcohol, or other water with high BOD. To use.
[0016]
And it is biologically treated with BOD component oxidizing bacteria or nitrate bacteria under aerobic conditions, and nitrogen (mainly ammonia or nitrate nitrogen) is converted into BOD component oxidizing bacteria or nitrate bacteria by two-stage aeration of high load aeration tank and aeration tank. Efficiently.
[0017]
Then, the BOD component oxidizing bacteria or nitrate bacteria that have periodically grown are dehydrated and discarded (incinerated or landfilled), for example, to reduce the nitrogen concentration in the treated wastewater to 10 mg / liter or less.
[0018]
【Example】
Embodiments of a biological treatment method and biological treatment apparatus for nitrogen-containing contaminated water according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a process diagram showing the biological treatment of the present invention.
[0019]
The biological treatment of the present invention is such that all steps can be treated under aerobic conditions, and as shown in FIG. 1, after the domestic wastewater is guided to the first settling tank 1 and foreign matter is precipitated and removed. The concentration is measured in the raw water tank 2.
[0020]
In other words, the raw water tank 2 is provided with a measuring device 3 capable of measuring the BOD concentration and the nitrogen concentration. Based on the measurement results of the BOD concentration and the nitrogen concentration measured by the measuring device 3, the both general Supplementing the shortage of BOD (organic carbon source) with methyl alcohol or ethyl alcohol or the like on the basis of various consumption relations.
[0021]
In the case of the examples, the BOD concentration and the nitrogen concentration in the raw water tank 2 were 200 mg / liter and 40 mg / liter, that is, BOD: nitrogen was 100: 20.
Therefore, in order to confirm the effect under each condition, the replenishment amount of an organic carbon source such as methyl alcohol was changed in the examples, and the BOD concentration was 500 mg / liter (BOD: nitrogen = 100: 8), 600 mg / liter (BOD: Nitrogen = 100: 6.7), 700 mg / liter (BOD: nitrogen = 100: 5.7), 800 mg / liter (BOD: nitrogen = 100: 5), 850 mg / liter (BOD: nitrogen = 100: 4.7) The experiment was conducted with five types of samples.
[0022]
Next, high-speed aeration is performed in the high-load aeration tank 4 for each sample by using both the aeration method and stirring in the liquid. This aeration is performed with sufficient aeration intensity so that sludge does not settle, and at the same time, biological treatment is performed with BOD component oxidizing bacteria or nitrate bacteria.
Table 1 shows measured values of BOD concentration and nitrogen concentration after treatment in the high-load aeration tank 4.
[0023]
[Table 1]
Figure 0003722497
[0024]
Next, aeration is performed in the aeration tank 5 further downstream by aeration and agitation in the liquid, and biological treatment is similarly performed with BOD component oxidizing bacteria or nitrate bacteria.
And the measured value of BOD density | concentration and nitrogen concentration after processing with the aeration tank 5 similarly is also shown in Table 1.
[0025]
Next, the sludge containing the BOD component oxidizing bacteria or nitrate bacteria and the treated waste water are separated in the second sedimentation tank 6, and the sludge containing the BOD component oxidizing bacteria or nitrate bacteria passes through the BOD component oxidizing bacteria or nitrate bacteria recovery pipe 7. It returns to the high load aeration tank 4 and the aeration tank 5.
Then, for example, the microorganism concentration in the high-load aeration tank 4 and the aeration tank 5 is kept in the range of 3,000 to 6,000 mg / liter, and the BOD component oxidizing bacteria or nitrate bacteria that grow are periodically dehydrated and discarded.
[0026]
At this time, the amount of sludge returned to the high-load aeration tank 4 is determined by the amount of BOD to be removed and is not constant.
[0027]
On the other hand, the treated wastewater is guided to the treatment tank 8 and checked for BOD, COD, PH, total nitrogen, etc., and discharged into the general environment.
[0028]
Here, when the content of BOD and total nitrogen in the treated wastewater discharged into the general environment is to be suppressed to 10 mg / liter or less, the weight concentration ratio of BOD to nitrogen is 100: 5 to 6.5 from Table 1 above. It turns out that it is necessary to make it.
[0029]
That is, if the nitrogen concentration is 5 mg / liter or less with respect to 100 mg / liter of BOD, there is a possibility that the BOD concentration in the treated wastewater will exceed 10 mg / liter, and the nitrogen content concentration with respect to 100 mg / liter of BOD. If it is 6.5 mg / liter or more, the nitrogen concentration in the treated wastewater may exceed 10 mg / liter.
[0030]
Such a processing method makes it possible to perform processing only under aerobic conditions, making it easy to set conditions and simplifying the apparatus.
[0031]
【The invention's effect】
As described above, the biological treatment method and apparatus for nitrogen-containing polluted water of the present invention eliminates the work of adding an organic carbon source such as methanol to the treated wastewater from which BOD has been removed once as in the prior art. In addition, since it can be processed only under aerobic conditions, it is not necessary to control various conditions in a complicated manner.
Also, the apparatus configuration does not require a complicated treatment tank as in the prior art, and the apparatus can be reduced in size and simplified. Moreover, it can be configured at low cost.
[Brief description of the drawings]
FIG. 1 is a flowchart of biological treatment of the present invention. FIG. 2 is a flowchart of conventional biological treatment.
1 First sedimentation tank 2 Raw water tank 3 Measuring device 4 High load aeration tank 5 Aeration tank 6 Second sedimentation tank 7 BOD component oxidizing bacteria or nitrate bacteria recovery piping

Claims (2)

窒素含有汚濁水を生物処理するようにした生物処理方法において、前記汚濁水中のＢＯＤと窒素の濃度が重量比で１００：５〜６．５となるように窒素を基準としてＢＯＤを添加し、好気性条件下で高負荷曝気槽及び曝気槽中の微生物濃度を３，０００〜６，０００ mg ／リットル範囲に保つようにし、定期的に、増殖するＢＯＤ成分酸化菌又は硝酸菌を脱水廃棄することにより生物処理することを特徴とする窒素含有汚濁水の生物処理方法。In the biological treatment method in which nitrogen-containing contaminated water is biologically treated, BOD is added on the basis of nitrogen so that the concentration of BOD and nitrogen in the contaminated water is 100: 5 to 6.5 by weight. Keep the microbial concentration in the high-load aeration tank and aeration tank under the tempering condition in the range of 3,000 to 6,000 mg / liter, and periodically dehydrate the BOD component oxidizing bacteria or nitrate bacteria that grow. Biological treatment method of nitrogen-containing polluted water, characterized by biological treatment by 窒素含有汚濁水を生物処理するようにした生物処理装置において、前記汚濁水から異物を沈殿除去させる第１沈殿槽と、この第１沈殿槽に続く原水槽に取付けられた測定装置により検出したＢＯＤと窒素の濃度に基づいて重量比でＢＯＤ：窒素を１００：５〜６．５となるように窒素を基準としてＢＯＤを添加する前記原水槽と、ＢＯＤを添加した汚濁水を好気性条件下でＢＯＤ成分酸化菌又は硝酸菌で生物処理する高負荷曝気槽及び曝気槽と、生物処理した汚濁水とＢＯＤ成分酸化菌又は硝酸菌を含む汚泥とを分離する第２沈殿槽を備え、分離したＢＯＤ成分酸化菌又は硝酸菌を含む汚泥を前記高負荷曝気槽及び曝気槽に返送し、好気性条件下で前記高負荷曝気槽及び曝気槽中の微生物濃度を３，０００〜６，０００ mg ／リットル範囲に保つようにし、定期的に、増殖するＢＯＤ成分酸化菌又は硝酸菌を脱水廃棄するとともに、生物処理した汚濁水を外部に排水することを特徴とする窒素含有汚濁水の生物処理装置。In a biological treatment apparatus adapted to biologically treat nitrogen-containing contaminated water, a BOD detected by a first settling tank that precipitates and removes foreign matters from the contaminated water , and a measuring device attached to the raw water tank following the first settling tank the BOD in a weight ratio based on the concentration of nitrogen: nitrogen 100: and the raw water tank of adding BOD based on the nitrogen such that 5-6.5, the polluted water with the addition of BOD under aerobic conditions A high-load aeration tank and aeration tank for biological treatment with BOD component oxidizing bacteria or nitrate bacteria, and a second sedimentation tank for separating biologically treated contaminated water and sludge containing BOD component oxidizing bacteria or nitrate bacteria, and separated BOD The sludge containing the component oxidizing bacteria or nitrate bacteria is returned to the high-load aeration tank and the aeration tank, and the microorganism concentration in the high-load aeration tank and the aeration tank is 3,000 to 6,000 mg / liter under aerobic conditions. Keep in range In addition, a biological treatment apparatus for nitrogen-containing polluted water , which periodically dehydrates and proliferates BOD component oxidizing bacteria or nitrate bacteria that proliferate and drains the biologically treated polluted water to the outside.
JP10290494A 1994-05-17 1994-05-17 Biological treatment method and biological treatment apparatus for nitrogen-containing polluted water Expired - Fee Related JP3722497B2 (en)

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