JP3653427B2 - Tofu drainage treatment method and equipment - Google Patents

Tofu drainage treatment method and equipment Download PDF

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JP3653427B2
JP3653427B2 JP30716599A JP30716599A JP3653427B2 JP 3653427 B2 JP3653427 B2 JP 3653427B2 JP 30716599 A JP30716599 A JP 30716599A JP 30716599 A JP30716599 A JP 30716599A JP 3653427 B2 JP3653427 B2 JP 3653427B2
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tofu
wastewater
tank
denitrification
nitrification
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JP2001121192A (en
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文夫 小濱
憲尋 志村
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Sumitomo Heavy Industries Ltd
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Sumitomo Heavy Industries Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、豆腐製造工場等で生じる豆腐排水を処理する豆腐排水処理設備及び方法に関するものである。
【０００２】
【従来の技術】
豆腐排水とは、豆腐の製造に使用された排水や製造後の機器の洗浄（アルカリ洗浄等）によって出た排水のことをいう。豆腐排水には、原料である大豆の成分、すなわち、蛋白質等が含まれているため、豆腐排水を未処理のまま湖沼や内湾などに放流すると、環境を著しく汚染する。従って、豆腐排水はその放流に先立ち、有機物成分及び窒素成分の除去が行われるのが一般的である。このような有機物成分及び窒素成分の除去方法としては、従来、豆腐排水は好気性条件下曝気槽で活性汚泥処理され、有機物成分は分解除去され、窒素成分は生物に捕捉され汚泥として除去されることが知られている。
【０００３】
【発明が解決しようとする課題】
しかしながら、前述した従来の有機物成分及び窒素成分の除去方法では、豆腐排水中の窒素成分を除去するには、広大なスペースが必要となる。更に、ランニングコストが高くなる上に、余剰汚泥が多量に発生し、余剰汚泥の処分費等のコストがかかる。また、豆腐排水中の窒素成分を十分に除去できない場合があった。
【０００４】
そこで、本発明は、豆腐排水中の有機物成分及び窒素成分を十分に低減でき、かつ省スペース化及び低コスト化を可能とする豆腐排水処理方法及び設備を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明者らは、上述した従来の問題点を解決すべく検討した結果、以下のことを見出した。すなわち、豆腐排水中の有機物成分濃度は、豆腐の製造工程や機器洗浄の時間帯などに依存して大きく変動し、豆腐排水中の有機物成分濃度が相当に大きくなるときがあり、そのときに曝気槽で活性汚泥処理を行うと、曝気槽の容積負荷が十分でないために窒素成分を十分に除去できないことを見出した。
【０００６】
そこで、本発明の豆腐排水処理方法は、豆腐排水から有機物成分及び窒素成分を除去する豆腐排水処理方法において、豆腐排水から懸濁物質を凝集分離する凝集分離工程と、豆腐排水を嫌気処理し、豆腐排水中の有機物成分を除去する嫌気処理工程と、豆腐排水を硝化脱窒処理し、豆腐排水中の窒素成分（例えば豆腐排水の嫌気処理工程で発生したＮＨ4 +−Ｎ）を除去する硝化脱窒工程とを含むことを特徴とする。ここで、「有機物成分」とは、炭素原子を含有する成分、例えば蛋白質、界面活性剤等をいい、「窒素成分」とは、窒素原子を含有する物質、例えば蛋白質、アンモニア、硝酸、窒素分子等をいう。
【０００７】
この場合、豆腐排水においては、懸濁物質中に窒素成分が多く取り込まれるため、懸濁物質を凝集分離すると、豆腐排水中の窒素成分の多くを除去することが可能となる。また、嫌気処理によって、有機物成分が十分に除去されると共に、残存の窒素成分（例えば蛋白質）はアンモニアに変換され、このアンモニアは更に生物学的硝化脱窒処理によって除去される。また、嫌気処理を行うための設備は曝気槽よりも高負荷運転が可能なため小型化が可能であり、また、曝気槽で豆腐排水を好気処理する場合に比べて余剰汚泥を少なくでき、曝気も不要となる。
【０００８】
また、本発明の豆腐排水処理設備は、豆腐排水から有機物成分及び窒素成分を除去する豆腐排水処理設備において、豆腐排水から懸濁物質を凝集分離する凝集分離装置と、凝集分離装置から導入される豆腐排水を嫌気処理し、豆腐排水中の有機物成分を除去する嫌気処理装置と、嫌気処理装置から導入される豆腐排水を硝化脱窒処理し、豆腐排水中の窒素成分を除去する硝化脱窒装置とを備えることを特徴とする。この発明の装置によれば上記方法を有効に行うことができる。
【０００９】
【発明の実施の形態】
以下、本発明の豆腐排水処理設備の実施形態について詳細に説明する。
【００１０】
図１は、本発明の豆腐排水処理設備の実施形態を示すフローシートである。図１に示すように、豆腐排水処理設備２０は、凝集沈殿槽（凝集沈殿設備）１を備えており、凝集沈殿槽１には、豆腐排水流入ラインＬ０を通して豆腐排水が導入される。流入ラインＬ０には凝集剤注入装置２が取り付けられ、凝集剤注入装置２から凝集剤が注入され、凝集剤によって豆腐排水中に懸濁物質が生成され、その懸濁物質が凝集沈殿槽１で沈降分離される。凝集剤としては、例えばＰＡＣ（ポリ塩化アルミニウム）、硫酸バンド、高分子ポリマーなどが用いられる。なお、凝集沈殿槽１で発生した余剰汚泥は、ラインＬ１を通して余剰汚泥貯槽３に送られ、更に脱水機４に送られて脱水され、脱水汚泥は産業廃棄物として処分される。
【００１１】
凝集沈殿槽１の下流には、凝集沈殿槽１から導入される豆腐排水を嫌気処理する嫌気処理設備５が設置され、嫌気処理設備５は、酸生成槽６と嫌気反応槽７とを備えている。酸生成槽６には、ラインＬ２を通して凝集沈殿槽１から豆腐排水が導入され、酸生成槽６は、豆腐排水中の有機物成分を酸生成菌によって酢酸、プロピオン酸、酪酸などの有機酸に分解する。嫌気反応槽７には、ラインＬ３を通してポンプＰ１により酸生成槽６から豆腐排水が導入され、嫌気反応槽７は、豆腐排水中の有機酸をメタン生成菌によって分解してメタンガス及び二酸化炭素を生成することで豆腐排水中の有機物成分を豆腐排水から除去する。
【００１２】
ここで、嫌気反応槽７としては、上向流嫌気性汚泥床（以下、「ＵＡＳＢ（Upflow Anaerobic Sludge Blanket）」という）式、担体を使用する流動床式、固定床式等の嫌気反応槽が挙げられるが、このうち、小型化の観点からは、容積負荷がより高いＵＡＳＢ式の嫌気反応槽７が好ましい。ＵＡＳＢ式の嫌気反応槽７内ではその底部にグラニュール汚泥が入っており、その中にメタン生成菌が存在する。この場合、豆腐排水は、嫌気反応槽７の下部から導入され、グラニュール汚泥床を通され、上部から排出される。
【００１３】
なお、酸生成槽６及び嫌気反応槽７で生成するメタンガスは、ラインＬ４を通してガスホルダ８に貯留され、適宜ボイラー９の燃焼に用いられる。
【００１４】
嫌気反応槽７の下流には、硝化脱窒処理設備１０が設置され、硝化脱窒処理設備１０は、嫌気反応槽７からラインＬ５を通して導入される豆腐排水を生物学的に硝化脱窒処理する。硝化脱窒処理設備１０としては、上流側から順次硝化槽および脱窒槽で構成されるもの、上流側から脱窒槽および硝化槽で構成され硝化槽内の豆腐排水の一部が脱窒槽に返送されるものが挙げられる。このうち、窒素成分の除去効率を向上させる点からは、図１に示すように上流側から脱窒槽１１および硝化槽１２で構成され硝化槽１２内の豆腐排水の一部が脱窒槽１１に返送されるものが好ましい。
【００１５】
ここで、脱窒槽１１は、その内部が嫌気状態に保持されており、硝化槽１２から返送される豆腐排水中の硝酸イオン等を窒素ガスに変換し、豆腐排水をラインＬ６を通して流出させる。硝化槽１２は、ラインＬ６を通して流入される豆腐排水に空気供給ライン１３を通してブロワ１４によって空気を供給し、内部を好気状態に保持し、豆腐排水中のアンモニウムイオンを硝化菌によって硝酸イオン等に変換する。更に、硝化槽１２からは、窒素成分の除去効率を向上させる点から、返送ライン（返送手段）１５が脱窒槽１１まで延びており、ポンプ（返送手段）Ｐ２によって硝化槽１２内の豆腐排水の一部を脱窒槽１１に返送する。
【００１６】
なお、硝化槽１２から流出される豆腐排水は、ラインＬ７を通して沈殿槽１６に送られ、沈殿槽１６は、硝化槽１２で硝化処理された豆腐排水中の懸濁物質等を沈殿分離し、河川や湖沼などに放流する。また、沈殿槽１６は、ラインＬ８を通して余剰汚泥を余剰汚泥貯槽３に送り、余剰汚泥の一部をラインＬ９を通して脱窒槽４に送る。余剰汚泥貯槽３に送られた余剰汚泥は、脱水機４で脱水された後に産業廃棄物として処分される。なお、脱水機４で生じる水は、脱窒槽１１内の脱窒に必要な有機物成分源に利用するため、ラインＬ１０を通して戻り水として脱窒槽１１に戻される。
【００１７】
次に、前述した構成の豆腐排水処理設備２０を用いた豆腐排水処理方法について説明する。
【００１８】
まず、凝集剤注入装置２から凝集剤を豆腐排水流入ラインＬ０に注入する。この場合、豆腐排水中に懸濁物質が生成され、この懸濁物質は凝集沈殿槽１に流入され、ここで凝集分離される（凝集分離工程）。このとき、懸濁物質中に窒素成分の多くが取り込まれているため、懸濁物質を凝集分離すると、豆腐排水中から窒素成分の多くを除去することが可能となる。更に、豆腐排水は、ラインＬ２を通して酸生成槽６に送られ、酸生成槽６内の酸生成菌によって豆腐排水中の有機物が有機酸に分解される。そして、豆腐排水は、ポンプＰ１によりラインＬ３を通して嫌気反応槽７に送られる。このとき、有機酸はメタン生成菌によってメタンガスと二酸化炭素とに分解されると同時に、蛋白質等由来のＮＨ4 +−Ｎが生成する（嫌気処理工程）。
【００１９】
そこで、嫌気反応槽７内の豆腐排水は、ラインＬ５を通して脱窒槽１１に送られた後、ラインＬ６を通して硝化槽１２に送られる（硝化脱窒処理工程）。すなわち、脱窒槽１１では、豆腐排水中の硝酸イオン等が脱窒素菌によって窒素ガスに変換され（脱窒工程）、硝化槽１２では、硝化菌によってアンモニウムイオンが硝酸イオン等に変換される（硝化工程）。従って、豆腐排水を脱窒槽１１と硝化槽１２との間で循環することで、豆腐排水中のより多くのアンモニウムイオンが窒素ガスとして放出される。このように、嫌気処理された豆腐排水に対して、硝化脱窒処理が行われるため、窒素成分を十分に除去することが可能である。
【００２０】
また、嫌気処理設備５は、曝気槽よりも高負荷であるため小型化が可能であり、豆腐排水設備２０全体として省スペース化が可能となる。更に、曝気槽で豆腐排水を好気処理する場合に比べて余剰汚泥を少なくすることができるので、余剰汚泥の処分費が節約でき、また、曝気も不要となるため、ランニングコストが低減される。
【００２１】
本発明は、前述した実施形態に限定されるものではない。例えば、上記実施形態では、凝集沈殿槽１で自然沈降した汚泥を取り出す凝集沈殿分離法に代えて、凝集沈殿槽１内の豆腐排水を加圧した後に通常の気圧に減圧して汚泥を取り出す加圧浮上分離法を用いてもよい。
【００２２】
【発明の効果】
以上述べたように本発明によれば、有機物成分濃度が高い場合でも豆腐排水から有機物成分を十分に除去すると共に、窒素成分についても除去することが可能となる。また、嫌気処理装置は曝気槽よりも高負荷であり小型化が可能であるため設備全体としての省スペース化が可能となる。更に、曝気槽で豆腐排水を好気処理する場合に比べて余剰汚泥を少なくでき、曝気が不要となるため、余剰汚泥の処分や曝気に要するランニングコストを低減することができる。
【図面の簡単な説明】
【図１】本発明の豆腐排水処理設備の一実施形態を示すフローシートである。
【符号の説明】
１…凝集沈殿槽（凝集分離設備）、５…嫌気処理設備、７…嫌気反応槽、１０…硝化脱窒処理設備、１１…脱窒槽、１２…硝化槽、１５…返送ライン（返送手段）、Ｐ２…ポンプ（返送手段）、２０…豆腐排水処理設備。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tofu wastewater treatment facility and method for treating tofu wastewater produced in a tofu production factory or the like.
[0002]
[Prior art]
Tofu drainage refers to wastewater used for the production of tofu and wastewater generated by washing equipment after production (alkali washing, etc.). Since the tofu drainage contains the components of soybean, which is a raw material, that is, protein and the like, if the tofu drainage is discharged into a lake, an inner bay or the like without being treated, the environment is significantly polluted. Therefore, in general, the tofu drainage is subjected to removal of organic components and nitrogen components prior to its release. As a method for removing organic components and nitrogen components, conventionally, tofu wastewater is treated with activated sludge in an aeration tank under aerobic conditions, organic components are decomposed and removed, and nitrogen components are captured by organisms and removed as sludge. It is known.
[0003]
[Problems to be solved by the invention]
However, the conventional organic component and nitrogen component removal method described above requires a large space in order to remove the nitrogen component in the tofu waste water. Further, the running cost is increased, and a large amount of surplus sludge is generated, which causes costs such as disposal of surplus sludge. Moreover, the nitrogen component in tofu waste water may not be able to be removed sufficiently.
[0004]
Accordingly, an object of the present invention is to provide a tofu wastewater treatment method and equipment that can sufficiently reduce organic components and nitrogen components in tofu wastewater, and that can save space and cost.
[0005]
[Means for Solving the Problems]
As a result of studies to solve the above-described conventional problems, the present inventors have found the following. In other words, the concentration of organic components in tofu drainage varies greatly depending on the tofu production process and equipment cleaning time zone, and the concentration of organic components in tofu drainage may increase considerably. It was found that when activated sludge treatment was performed in the tank, the nitrogen component could not be removed sufficiently because the volume load of the aeration tank was not sufficient.
[0006]
Therefore, the tofu wastewater treatment method of the present invention is a tofu wastewater treatment method for removing organic components and nitrogen components from tofu wastewater, and an aggregating and separating step for aggregating and separating suspended substances from tofu wastewater, and anaerobically treating the tofu wastewater, Anaerobic treatment process to remove organic components in tofu wastewater and nitrification to remove nitrogen components in tofu wastewater (eg NH 4 + -N generated in anaerobic treatment process of tofu wastewater) And a denitrification step. Here, the “organic component” refers to a component containing a carbon atom, such as a protein or a surfactant, and the “nitrogen component” refers to a substance containing a nitrogen atom, such as a protein, ammonia, nitric acid, or nitrogen molecule. Etc.
[0007]
In this case, in the tofu drainage, a large amount of nitrogen component is taken into the suspended substance. Therefore, if the suspended substance is agglomerated and separated, most of the nitrogen component in the tofu drainage can be removed. In addition, the organic component is sufficiently removed by the anaerobic treatment, and the remaining nitrogen component (for example, protein) is converted into ammonia, which is further removed by biological nitrification denitrification treatment. In addition, the equipment for anaerobic treatment can be downsized because it can be operated at a higher load than the aeration tank, and the amount of excess sludge can be reduced compared to the aerobic treatment of tofu wastewater in the aeration tank, Aeration is also unnecessary.
[0008]
The tofu wastewater treatment facility of the present invention is introduced from a coagulation / separation device for coagulating and separating suspended substances from the tofu wastewater and a coagulation / separation device in a tofu wastewater treatment facility for removing organic components and nitrogen components from tofu wastewater. Anaerobic treatment equipment that anaerobically treats tofu wastewater and removes organic components in tofu wastewater, and nitrification denitrification equipment that removes nitrogen components in tofu wastewater by nitrifying and denitrifying the tofu wastewater introduced from the anaerobic treatment equipment It is characterized by providing. According to the apparatus of the present invention, the above method can be effectively performed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the tofu wastewater treatment facility of the present invention will be described in detail.
[0010]
FIG. 1 is a flow sheet showing an embodiment of a tofu wastewater treatment facility of the present invention. As shown in FIG. 1, the tofu drainage treatment facility 20 includes a coagulation sedimentation tank (coagulation sedimentation facility) 1, and the tofu drainage is introduced into the coagulation sedimentation tank 1 through the tofu drainage inflow line L <b> 0. A flocculant injection device 2 is attached to the inflow line L0. The flocculant is injected from the flocculant injection device 2, and a suspended substance is generated in the tofu drainage by the flocculant. Sedimentation is separated. As the flocculant, for example, PAC (polyaluminum chloride), a sulfuric acid band, a high molecular polymer, or the like is used. The surplus sludge generated in the coagulation sedimentation tank 1 is sent to the surplus sludge storage tank 3 through the line L1, further sent to the dehydrator 4, and dehydrated, and the dehydrated sludge is disposed as industrial waste.
[0011]
An anaerobic treatment facility 5 for anaerobically treating the tofu wastewater introduced from the coagulation sedimentation tank 1 is installed downstream of the coagulation sedimentation tank 1, and the anaerobic treatment facility 5 includes an acid generation tank 6 and an anaerobic reaction tank 7. Yes. Tofu drainage is introduced into the acid generation tank 6 from the coagulation sedimentation tank 1 through the line L2, and the acid generation tank 6 decomposes organic components in the tofu drainage into organic acids such as acetic acid, propionic acid and butyric acid by acid generating bacteria. To do. Tofu waste water is introduced into the anaerobic reaction tank 7 from the acid generation tank 6 by the pump P1 through the line L3, and the anaerobic reaction tank 7 decomposes the organic acid in the tofu waste water with the methanogen to produce methane gas and carbon dioxide. By doing so, organic components in the tofu drainage are removed from the tofu drainage.
[0012]
Here, as the anaerobic reaction tank 7, an anaerobic reaction tank such as an upflow anaerobic sludge bed (hereinafter referred to as "UASB (Upflow Anaerobic Sludge Blanket)") type, a fluidized bed type using a carrier, a fixed bed type, etc. Among these, from the viewpoint of downsizing, the UASB type anaerobic reaction tank 7 having a higher volumetric load is preferable. In the UASB type anaerobic reaction tank 7, granule sludge is contained at the bottom, and methanogenic bacteria are present therein. In this case, the tofu drainage is introduced from the lower part of the anaerobic reaction tank 7, passed through the granule sludge bed, and discharged from the upper part.
[0013]
Note that the methane gas generated in the acid generation tank 6 and the anaerobic reaction tank 7 is stored in the gas holder 8 through the line L4 and used for combustion of the boiler 9 as appropriate.
[0014]
A nitrification denitrification treatment facility 10 is installed downstream of the anaerobic reaction tank 7, and the nitrification denitrification treatment facility 10 biologically nitrifies and denitrifies the tofu wastewater introduced from the anaerobic reaction tank 7 through the line L5. . The nitrification / denitrification treatment equipment 10 is composed of a nitrification tank and a denitrification tank sequentially from the upstream side, and is composed of a denitrification tank and a nitrification tank from the upstream side, and a part of the tofu wastewater in the nitrification tank is returned to the denitrification tank. Can be mentioned. Among these, from the viewpoint of improving the nitrogen component removal efficiency, as shown in FIG. 1, the denitrification tank 11 and the nitrification tank 12 are configured from the upstream side, and a part of the tofu drainage in the nitrification tank 12 is returned to the denitrification tank 11. Are preferred.
[0015]
Here, the inside of the denitrification tank 11 is maintained in an anaerobic state, and nitrate ions and the like in the tofu drainage returned from the nitrification tank 12 are converted into nitrogen gas, and the tofu drainage is caused to flow out through the line L6. The nitrification tank 12 supplies air to the tofu drainage flowing in through the line L6 by the blower 14 through the air supply line 13 and keeps the inside in an aerobic state, and converts ammonium ions in the tofu drainage into nitrate ions and the like by nitrifying bacteria. Convert. Further, from the point of improving the removal efficiency of nitrogen components from the nitrification tank 12, a return line (return means) 15 extends to the denitrification tank 11, and the tofu drainage in the nitrification tank 12 is pumped by the pump (return means) P2. A part is returned to the denitrification tank 11.
[0016]
In addition, the tofu waste water which flows out from the nitrification tank 12 is sent to the sedimentation tank 16 through the line L7, and the sedimentation tank 16 precipitates and separates suspended substances and the like in the tofu waste water nitrified in the nitrification tank 12, and the river Released into lakes and lakes. Moreover, the sedimentation tank 16 sends the excess sludge to the excess sludge storage tank 3 through the line L8, and sends a part of the excess sludge to the denitrification tank 4 through the line L9. The excess sludge sent to the excess sludge storage tank 3 is dehydrated by the dehydrator 4 and then disposed as industrial waste. The water generated in the dehydrator 4 is returned to the denitrification tank 11 as return water through the line L10 in order to be used as an organic component source necessary for denitrification in the denitrification tank 11.
[0017]
Next, a tofu wastewater treatment method using the tofu wastewater treatment facility 20 having the above-described configuration will be described.
[0018]
First, the flocculant is injected from the flocculant injection device 2 into the tofu drainage inflow line L0. In this case, a suspended substance is generated in the tofu waste water, and this suspended substance flows into the agglomeration sedimentation tank 1, where it is agglomerated and separated (aggregation separation step). At this time, since most of the nitrogen component is taken into the suspended substance, when the suspended substance is agglomerated and separated, it is possible to remove most of the nitrogen component from the tofu waste water. Further, the tofu drainage is sent to the acid generation tank 6 through the line L2, and the organic matter in the tofu drainage is decomposed into organic acids by the acid generating bacteria in the acid generation tank 6. And the tofu waste water is sent to the anaerobic reaction tank 7 through the line L3 by the pump P1. At this time, the organic acid is decomposed into methane gas and carbon dioxide by the methanogen, and at the same time, NH 4 + -N derived from protein or the like is produced (anaerobic treatment step).
[0019]
Therefore, the tofu wastewater in the anaerobic reaction tank 7 is sent to the denitrification tank 11 through the line L5 and then sent to the nitrification tank 12 through the line L6 (nitrification denitrification treatment step). That is, in the denitrification tank 11, nitrate ions and the like in the tofu drainage are converted into nitrogen gas by denitrifying bacteria (denitrification process), and in the nitrification tank 12, ammonium ions are converted into nitrate ions and the like by nitrifying bacteria (nitrification). Process). Therefore, by circulating the tofu waste water between the denitrification tank 11 and the nitrification tank 12, more ammonium ions in the tofu waste water are released as nitrogen gas. Thus, since the nitrification denitrification process is performed on the anaerobic tofu waste water, it is possible to sufficiently remove the nitrogen component.
[0020]
Moreover, since the anaerobic treatment facility 5 has a higher load than the aeration tank, the anaerobic treatment facility 5 can be reduced in size, and the tofu drainage facility 20 as a whole can save space. Furthermore, surplus sludge can be reduced as compared with the case where the tofu wastewater is aerobically treated in the aeration tank, so that the disposal cost of the surplus sludge can be saved and the aeration is unnecessary, so the running cost is reduced. .
[0021]
The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, instead of the coagulation sedimentation separation method in which the sludge naturally settled in the coagulation sedimentation tank 1 is added, the tofu drainage in the coagulation sedimentation tank 1 is pressurized and then decompressed to a normal pressure to extract the sludge. A pressure levitation separation method may be used.
[0022]
【The invention's effect】
As described above, according to the present invention, even when the organic component concentration is high, the organic component can be sufficiently removed from the tofu waste water, and the nitrogen component can also be removed. In addition, since the anaerobic treatment apparatus has a higher load than the aeration tank and can be miniaturized, it is possible to save space as a whole facility. Furthermore, surplus sludge can be reduced and aeration is unnecessary compared with the case where the tofu wastewater is aerobically treated in the aeration tank, so that the running cost required for disposal and aeration of the excess sludge can be reduced.
[Brief description of the drawings]
FIG. 1 is a flow sheet showing an embodiment of a tofu wastewater treatment facility of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Coagulation sedimentation tank (aggregation separation equipment), 5 ... Anaerobic processing equipment, 7 ... Anaerobic reaction tank, 10 ... Nitrification denitrification processing equipment, 11 ... Denitrification tank, 12 ... Nitrification tank, 15 ... Return line (return means), P2 ... pump (return means), 20 ... tofu wastewater treatment facility.

Claims (6)

豆腐排水から有機物成分及び窒素成分を除去する豆腐排水処理方法において、
前記豆腐排水から懸濁物質を凝集分離する凝集分離工程と、
前記豆腐排水を嫌気処理し、前記豆腐排水中の有機物成分を除去する嫌気処理工程と、
前記豆腐排水を硝化脱窒処理し、前記豆腐排水中の窒素成分を除去する硝化脱窒工程と、
を含むことを特徴とする豆腐排水処理方法。In a tofu wastewater treatment method for removing organic components and nitrogen components from tofu wastewater,
A coagulation separation step of coagulating and separating suspended substances from the tofu waste water,
Anaerobic treatment of the tofu drainage, an anaerobic treatment step of removing organic components in the tofu drainage,
Nitrification and denitrification treatment of the tofu wastewater, and a nitrification and denitrification step of removing nitrogen components in the tofu wastewater,
A tofu wastewater treatment method comprising: 前記嫌気処理工程は、前記豆腐排水中の有機物成分をメタン生成菌によって除去する嫌気反応工程を含むことを特徴とする請求項１に記載の豆腐排水処理方法。The tofu wastewater treatment method according to claim 1, wherein the anaerobic treatment step includes an anaerobic reaction step in which organic components in the tofu wastewater are removed by a methanogen. 前記硝化脱窒工程は、
前記嫌気処理工程で嫌気処理された豆腐排水中の窒素成分を脱窒菌によって脱窒処理する脱窒工程と、
前記脱窒工程で得られる豆腐排水中の窒素成分を硝化菌によって硝化処理する硝化工程と、
前記硝化工程で得られる豆腐排水の一部を前記脱窒工程に返送する返送工程と、
を含むことを特徴とする請求項１又は２に記載の豆腐排水処理方法。The nitrification denitrification step includes
A denitrification step of denitrifying a nitrogen component in the tofu wastewater anaerobically treated in the anaerobic treatment step by denitrifying bacteria;
A nitrification step of nitrifying the nitrogen component in the tofu drainage obtained in the denitrification step with nitrifying bacteria;
A return process for returning a part of the tofu drainage obtained in the nitrification process to the denitrification process;
The tofu drainage processing method of Claim 1 or 2 characterized by the above-mentioned. 豆腐排水から有機物成分及び窒素成分を除去する豆腐排水処理設備において、
前記豆腐排水から懸濁物質を凝集分離する凝集分離設備と、
前記凝集分離設備から導入される豆腐排水を嫌気処理し、前記豆腐排水中の前記有機物成分を除去する嫌気処理設備と、
前記嫌気処理設備から導入される豆腐排水を硝化脱窒処理し、豆腐排水中の窒素成分を除去する硝化脱窒処理設備と、
を備えることを特徴とする豆腐排水処理設備。In tofu wastewater treatment equipment that removes organic and nitrogen components from tofu wastewater,
An aggregating and separating facility for aggregating and separating suspended substances from the tofu waste water;
Anaerobic treatment of tofu wastewater introduced from the coagulation separation equipment, anaerobic treatment equipment to remove the organic components in the tofu wastewater, and
Nitrification denitrification treatment of tofu wastewater introduced from the anaerobic treatment equipment, and removal of nitrogen components in the tofu wastewater;
A tofu wastewater treatment facility characterized by comprising: 前記嫌気処理設備が、上向流嫌気性汚泥床式の嫌気反応槽を備えることを特徴とする請求項４に記載の豆腐排水処理設備。The tofu wastewater treatment facility according to claim 4, wherein the anaerobic treatment facility includes an anaerobic reaction tank of an upflow anaerobic sludge bed type. 前記硝化脱窒処理設備が、
嫌気処理された豆腐排水を脱窒菌によって脱窒処理する脱窒槽と、
脱窒処理された豆腐廃水を硝化菌によって硝化処理する硝化槽と、
前記硝化槽内の豆腐排水を前記脱窒槽に返送する返送手段とを備え、
前記硝化槽で硝化された豆腐排水中の窒素成分が前記脱窒槽で脱窒菌によって脱窒処理されることを特徴とする請求項４又は５に記載の豆腐排水処理設備。The nitrification denitrification treatment facility is
A denitrification tank for denitrifying anaerobic tofu wastewater by denitrifying bacteria,
A nitrification tank for nitrifying denitrified tofu wastewater with nitrifying bacteria;
A return means for returning the tofu drainage in the nitrification tank to the denitrification tank,
The tofu wastewater treatment facility according to claim 4 or 5, wherein a nitrogen component in the tofu wastewater nitrified in the nitrification tank is denitrified by denitrifying bacteria in the denitrification tank.
JP30716599A 1999-10-28 1999-10-28 Tofu drainage treatment method and equipment Expired - Fee Related JP3653427B2 (en)

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