JP4472154B2

JP4472154B2 - Legume wastewater treatment method and legume wastewater treatment apparatus

Info

Publication number: JP4472154B2
Application number: JP2000331190A
Authority: JP
Inventors: 文夫小濱; 哲史鈴木
Original assignee: Sumitomo Heavy Industries Environment Co Ltd
Current assignee: Sumitomo Heavy Industries Environment Co Ltd
Priority date: 2000-10-30
Filing date: 2000-10-30
Publication date: 2010-06-02
Anticipated expiration: 2020-10-30
Also published as: JP2002126784A

Description

【０００１】
【発明の属する技術分野】
本発明は、豆類排水処理方法及び豆類排水処理装置に関する。
【０００２】
【従来の技術】
コーヒー排水を浄化処理する方法及び浄化処理する装置に関しては、例えば、特開平１０−２１６７７９号公報に記載されている。この公報に記載の方法及び装置では、コーヒーの製造に伴い生じる設備排水を被処理水として反応槽に供給し、この反応槽において、被処理水に嫌気性雰囲気下で生物処理（生物学的処理）を施し、この生物処理を施した後の処理水に凝集沈殿処理を施して処理水と凝沈汚泥とに分離し、コーヒーの製造に伴い生じるコーヒー粕圧搾濾液と上記凝沈汚泥とを混合して脱水し、この脱水濾液を上記被処理水（設備排水）に混入するように成され、コーヒー粕圧搾濾液の油分が、凝沈汚泥と混合される間に当該凝沈汚泥に付着し脱水に伴って脱水汚泥（シート状の脱水ケーキ）と共に排出されるため、脱水濾液に含有される油分の量が極端に少なく、反応槽内の被処理水中の油分も少なくなることから、グラニュールメタン菌の活性低下が防止されると共に当該グラニュールメタン菌の油分に付着しての後段への流出が防止され、生物処理を継続して実施するのが可能とされている。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記公報に記載の方法及び装置にあっては、コーヒー粕圧搾濾液に含まれる油分が多量の場合、油分を吸着する凝沈汚泥が不足して油分の除去が不十分となり、場合によっては後段の生物処理を継続して実施するのが困難となる虞がある。このような虞は、コーヒー以外の有機物濃度の高い例えばカカオ、胡麻、大豆等の豆類の油分含有排水に対しても同様に生じる。
【０００４】
本発明は、このような課題を解決するためになされたものであり、豆類粕圧搾濾液の油分が確実に除去され、後段の生物処理が安定して実施される豆類排水処理方法及び豆類排水処理装置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】
本発明による豆類排水処理方法は、豆類の製造に伴い生じる設備排水を被処理水として当該被処理水に生物処理を施し、この生物処理を施した処理水に凝集分離処理を施して凝集汚泥と分離処理水とに分離し、豆類の製造に伴い生じる豆類粕圧搾濾液と凝集剤とを混合し凝集汚泥及び凝集処理水を含有する混合液を生成し、この混合液と上記凝集分離処理で分離された凝集汚泥とを混合し脱水して脱水汚泥と脱水濾液とに分離し、この脱水濾液を上記被処理水に混合することを特徴としている。
【０００６】
また、本発明による豆類排水処理装置は、豆類の製造に伴い生じる設備排水を被処理水として当該被処理水に生物処理を施す生物処理槽と、この生物処理が施された処理水と凝集剤とを混合し凝集汚泥及び凝集処理水を含有する混合液を生成する凝集汚泥生成槽と、この凝集汚泥生成槽の混合液を凝集汚泥と分離処理水とに固液分離する固液分離装置と、豆類の製造に伴い生じる豆類粕圧搾濾液と凝集剤とを混合し凝集汚泥及び凝集処理水を含有する混合液を生成する豆類粕圧搾濾液凝集反応槽と、この豆類粕圧搾濾液凝集反応槽の混合液と上記固液分離装置で分離された凝集汚泥とを混合する混合槽と、この混合槽の混合液を脱水して脱水汚泥と脱水濾液とに分離する脱水機と、この脱水濾液を、上記被処理水と混合すべく供給する脱水濾液供給ラインと、を具備して成る。
【０００７】
このような豆類排水処理方法及び豆類排水処理装置によれば、豆類粕圧搾濾液と凝集剤とが混合されることから、凝集汚泥（フロック）が形成され、この凝集汚泥に、豆類粕圧搾濾液の油分の一部が取り込まれる。この凝集汚泥を含む混合液が、設備排水に生物処理、凝集分離処理を施して得られる凝集汚泥に混合されることで、豆類粕圧搾濾液の残りの油分が、当該混合する凝集汚泥に吸着される。このため、豆類粕圧搾濾液の全ての油分が、汚泥に取り込まれる。この全ての油分は、脱水に伴って脱水汚泥と共に脱水濾液に対して分離され、この脱水濾液が、生物処理が施されることになる被処理水に混合される。
【０００８】
【発明の実施の形態】
以下、本発明に係る豆類排水処理方法及び豆類排水処理装置の好適な実施形態について添付図面を参照しながら説明する。図１は、本発明によるコーヒー排水処理方法を採用したコーヒー排水処理装置を示すブロック構成図である。
【０００９】
本実施形態のコーヒー排水処理装置は、コーヒーの製造に伴い生じるコーヒー排水としての設備排水及びコーヒー粕圧搾濾液を浄化処理するもので、概略、上流から下流（図示左側から右側）に向かって、設備排水を貯水する原水調整槽１１、生物処理槽としての嫌気性処理槽１２及び好気性処理槽１３、凝集汚泥生成槽としての混和槽１４及び凝集槽１５、固液分離装置としての凝集沈殿槽２１、砂濾過槽２２、活性炭吸着塔２４をこの順に接続して成ると共に、コーヒー粕圧搾濾液を貯留するコーヒー粕圧搾濾液ピット３１、コーヒー粕圧搾濾液凝集反応槽３２、混合槽としての汚泥貯留槽２３、脱水機３３、脱水汚泥コンテナ３４をこの順に接続して成り、さらに、凝集沈殿槽２１に汚泥貯留槽２３を、脱水機３３に原水調整槽１１を各々接続して成る。
【００１０】
原水調整槽１１は、ラインＬ１を介して供給される設備排水を貯水する。この設備排水は、コーヒー豆、コーヒー豆をクラッシングした破砕粒、砂糖、ミルク等を収容する各収容桶を洗浄した時に生じる排水である。この原水調整槽１１の設備排水は、被処理水としてラインＬ２を介して嫌気性処理槽１２に供給される。
【００１１】
嫌気性処理槽１２は、被処理水に、嫌気性雰囲気下でメタン発酵法の一つであるＵＡＳＢ法による生物処理（嫌気性処理）を施して、被処理水に含有されるＣＯＤ（Chemical Oxygen Demand）、ＢＯＤ（Biochemical Oxygen Demand）等の有機物をメタン発酵させてメタンガスに変換する。このＵＡＳＢ法では、メタン菌を自己固定化して形成された固定化菌としてのグラニュールメタン菌が使用され、嫌気性処理槽１２に形成されるグラニュール汚泥ゾーンでのグラニュールメタン菌の活性により有機物がメタン発酵される。なお、グラニュールメタン菌に油分が付着すると、グラニュールメタン菌の活性が低下すると共に、当該グラニュールメタン菌が液面に浮上して後段に流出し嫌気性処理の継続が難しくなる。
【００１２】
この嫌気性処理槽１２でのメタン発酵により生じるメタンガスは、図示を省略したラインを介して排出され燃料等として使用され、一方、嫌気性処理槽１２の処理水は、ラインＬ３を介して好気性処理槽１３に供給される。
【００１３】
好気性処理槽１３は、嫌気性処理槽１２の処理水に好気性処理を施して、メタン発酵法で生物処理できずに残存する有機物を分解する。この好気性処理槽１３の処理水は、ラインＬ４を介して混和槽１４に供給される。
【００１４】
混和槽１４は、好気性処理槽１３の処理水に、ラインＬ１５を介して例えばＦｅＣｌ₃等の無機凝集剤を添加し、撹拌装置１８で撹拌することで、色度成分が凝集される凝集汚泥としての微細フロックを形成し、この凝集汚泥（微細フロック）及び凝集処理水を含有する混合液を生成する。この混和槽１４で生成される混合液は、凝集槽１５に供給される。
【００１５】
凝集槽１５は、混和槽１４の混合液に、ラインＬ１６を介して例えばアニオン系等の高分子凝集剤を添加し、撹拌装置１９で撹拌することで、微細フロックを粗大化して凝集汚泥としての粗大フロックを形成し、この凝集汚泥（粗大フロック）及び凝集処理水を含有する混合液を生成する。この凝集槽１５で生成される混合液は、ラインＬ５を介して凝集沈殿槽２１に供給される。
【００１６】
凝集沈殿槽２１は、凝集槽１５の混合液を固液分離し、分離処理水と色度成分を含む凝沈汚泥（凝集汚泥）とに分離する。この凝集沈殿槽２１で固液分離されて沈殿する凝沈汚泥は、ラインＬ７を介して汚泥貯留槽２３に供給される。一方、凝集沈殿槽２１の分離処理水は、ラインＬ６を介して砂濾過槽２２に供給される。
【００１７】
砂濾過槽２２は、分離処理水を清澄濾過処理し、ＳＳ（Suspended Solids）等の微細な懸濁物を捕捉する。この砂濾過槽２２の分離濾液は、ラインＬ８を介して、活性炭吸着塔２４に供給される。
【００１８】
活性炭吸着塔２４は、分離濾液を活性炭吸着処理し、残留している色度成分及びＣＯＤ等の有機物を捕捉する。この活性炭吸着塔２４の活性炭吸着処理水は、図示を省略した処理水槽に供給され、滅菌後に適宜放流される。
【００１９】
ところで、焙煎したコーヒー豆をクラッシングして成る破砕粒は、抽出釜に投入され当該抽出釜に蒸気を通すことで、コーヒー抽出液が抽出され、一方、コーヒー抽出液が抽出された後の破砕粒は、水分を含有するコーヒー粕として排出され、このコーヒー粕は、例えばスクリュープレス等で水切りすることで、固形成分と油分を多く含むコーヒー粕圧搾濾液とに分離される。
【００２０】
このコーヒー粕圧搾濾液が、上記コーヒー粕圧搾濾液ピット３１に貯留される。このコーヒー粕圧搾濾液ピット３１のコーヒー粕圧搾濾液は、ラインＬ９を介してコーヒー粕圧搾濾液凝集反応槽３２に供給される。
【００２１】
当該コーヒー粕圧搾濾液ピット３１と汚泥貯留槽２３との間に介装されるコーヒー粕圧搾濾液凝集反応槽３２は、本実施形態の特徴を成すもので、槽３２内に無機凝集剤を添加する無機凝集剤供給ラインとしてのラインＬ１０を備えると共に、フロック（凝集汚泥）の形成を促進すべく槽３２内を撹拌する撹拌装置３５を備え、この無機凝集剤の添加及び撹拌に従って、凝集汚泥（フロック）及び凝集処理水を含有する混合液を生成する。ここで、添加する無機凝集剤としては、油分の除去性能、色度成分の除去性能及びランニングコスト等の観点から、アルミ系より鉄系が望ましく、例えば塩化第２鉄等を採用するのが好ましい。また、無機凝集剤に代えて高分子凝集剤を添加しても良く、この高分子凝集剤としては、例えばアニオン系のものが好ましい。そして、このコーヒー粕圧搾濾液凝集反応槽３２で生成される混合液は、ラインＬ１１を介して上記汚泥貯留槽２３に供給される。
【００２２】
汚泥貯留槽２３には、このコーヒー粕圧搾濾液凝集反応槽３２の混合液が供給されると共に、前述したように、凝集沈殿槽２１で固液分離された凝沈汚泥がラインＬ７を介して供給される。この汚泥貯留槽２３は、これらの混合液及び凝沈汚泥を撹拌装置３６で撹拌することで混合する。この汚泥貯留槽２３の混合液は、ラインＬ１２を介して脱水機３３に供給される。
【００２３】
脱水機３３は、この混合液に脱水処理を施して、脱水汚泥と脱水濾液とに分離する。この脱水汚泥は、ラインＬ１３を介して脱水汚泥コンテナ３４に供給され、適宜系外に排出される。一方、脱水濾液は被処理水として、脱水濾液供給ラインとしてのラインＬ１４を介して上記原水調整槽１１に供給される。
【００２４】
このように構成されたコーヒー排水処理装置によれば、コーヒー粕圧搾濾液ピット３１のコーヒー粕圧搾濾液は、汚泥貯留槽２３に供給される前に、コーヒー粕圧搾濾液凝集反応槽３２に供給され、当該コーヒー粕圧搾濾液に対して凝集剤が添加されて凝集処理が施されるため、凝集汚泥（フロック）が形成され、この凝集汚泥に、コーヒー粕圧搾濾液の油分の一部が取り込まれる。この凝集汚泥を含む混合液は、後段の汚泥貯留槽２３で凝沈汚泥に混合されるため、コーヒー粕圧搾濾液の残りの油分が、当該凝沈汚泥に吸着される。このため、コーヒー粕圧搾濾液の全ての油分が、汚泥に取り込まれることになる。
【００２５】
この全ての油分は、脱水機３３による脱水に伴って脱水汚泥と共に脱水濾液に対して分離されて系外に排出される。従って、本実施形態では、コーヒー粕圧搾濾液の油分が確実に除去されている。
【００２６】
一方、脱水機３３で脱水汚泥と分離された脱水濾液は、ラインＬ１４を介して原水調整槽１１に供給されて、当該原水調整槽１１の設備排水に混合され、嫌気性処理槽１２で嫌気性処理が施される。
【００２７】
この時、混合される脱水濾液に油分が含まれていないため、グラニュールメタン菌の活性低下及び液面に浮上しての流出が無く、有機物が活発にメタン発酵される。そして、この処理水には、以降、好気性処理、凝集沈殿処理が施される。
【００２８】
このように、本実施形態では、コーヒー粕圧搾濾液凝集反応槽３２で、凝集汚泥（フロック）を形成して、この凝集汚泥に、コーヒー粕圧搾濾液の油分の一部を取り込み、汚泥貯留槽２３で、コーヒー粕圧搾濾液の残りの油分を凝沈汚泥に吸着させることで、コーヒー粕圧搾濾液の全ての油分を汚泥に取り込み、この全ての油分を、原水調整槽に供給される脱水濾液に対して脱水機３３で分離しているため、たとえコーヒー粕圧搾濾液の油分が多量で凝沈汚泥が不足しても、当該コーヒー粕圧搾濾液の油分が確実に除去され、後段の生物処理を安定して実施するのが可能とされている。
【００２９】
以上、本発明をその実施形態に基づき具体的に説明したが、本発明は上記実施形態に限定されるものではなく、例えば、上記実施形態においては、コーヒー粕圧搾濾液ピット３１と汚泥貯留槽２３との間にコーヒー粕圧搾濾液凝集反応槽３２を介装し、このコーヒー粕圧搾濾液凝集反応槽３２に凝集剤を添加するようにしているが、コーヒー粕圧搾濾液を汚泥貯水槽２３に供給するラインＬ９に凝集剤を添加するようにしても良く、さらにコーヒー粕圧搾濾液凝集反応槽３２を無くしてコーヒー粕圧搾濾液を汚泥貯水槽２３に供給するラインに凝集剤を添加するようにしても良い。
【００３０】
また、上記実施形態においては、脱水濾液をラインＬ１４を介して原水調整槽１１に供給するようにしているが、設備排水を嫌気性処理槽１２に供給するラインＬ２に供給するようにしても良く、要は、脱水濾液を被処理水（設備排水）に混合するように供給できれば良い。
【００３１】
また、上記実施形態においては、固液分離装置を凝集沈殿槽２１としているが、凝集汚泥と分離処理水とに固液分離する固液分離装置であれば良い。
【００３２】
さらにまた、上記実施形態においては、コーヒーに対する適用を述べているが、コーヒー以外の例えばカカオ、胡麻、大豆等の豆類に対しても同様に適用可能である。
【００３３】
【発明の効果】
本発明による豆類排水処理方法及び豆類排水処理装置は、豆類粕圧搾濾液と凝集剤とを混合することで、凝集汚泥（フロック）を形成して、この凝集汚泥に、豆類粕圧搾濾液の油分の一部を取り込み、この凝集汚泥を含む混合液と、設備排水に生物処理、凝集分離処理を施して得られる凝集汚泥とを混合することで、豆類粕圧搾濾液の残りの油分を当該混合する凝集汚泥に吸着させて、豆類粕圧搾濾液の全ての油分を汚泥に取り込むのを可能とし、この全ての油分を、脱水に伴って脱水汚泥と共に脱水濾液に対して分離して、この脱水濾液を、生物処理が施されることになる被処理水に混合するようにしているため、豆類粕圧搾濾液の油分が確実に除去されることになり、後段の生物処理を安定して実施するのが可能となる。
【図面の簡単な説明】
【図１】本発明によるコーヒー排水処理方法を採用したコーヒー排水処理装置を示すブロック構成図である。
【符号の説明】
１１…原水調整槽、１２…嫌気性処理槽（生物処理槽）、１３…好気性処理槽（生物処理槽）、１４…混和槽（凝集汚泥生成槽）、１５…凝集槽（凝集汚泥生成槽）、２１…凝集沈殿槽（固液分離装置）、２３…汚泥貯留槽（混合槽）、３２…コーヒー粕圧搾濾液凝集反応槽、３３…脱水機、Ｌ１０…無機凝集剤供給ライン、Ｌ１４…脱水濾液供給ライン。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a legume wastewater treatment method and a legume wastewater treatment apparatus.
[0002]
[Prior art]
A method for purifying coffee wastewater and an apparatus for purifying the coffee are described in, for example, JP-A-10-216779. In the method and apparatus described in this publication, facility wastewater generated by coffee production is supplied to a reaction tank as treated water. In this reaction tank, biological treatment (biological treatment) is performed on the treated water in an anaerobic atmosphere. ), The treated water after this biological treatment is coagulated and settled to separate the treated water and the coagulated sludge, and the coffee squeeze press filtrate resulting from coffee production and the above coagulated sludge are mixed. The dehydrated filtrate is mixed with the water to be treated (equipment wastewater), and the oil content of the coffee grounds press filtrate adheres to the settling sludge while being mixed with the settling sludge. Since it is discharged together with the dehydrated sludge (sheet-shaped dehydrated cake), the amount of oil contained in the dehydrated filtrate is extremely small, and the amount of oil in the water to be treated in the reaction tank is also reduced. Prevention of fungal activity reduction Rutotomoni outflow to the subsequent adhering to oil of the granule methane bacteria is prevented, and is capable to implement continuously the biological treatment.
[0003]
[Problems to be solved by the invention]
However, in the method and apparatus described in the above publication, when the amount of oil contained in the coffee squeeze press filtrate is large, the sludge adsorbing the oil is insufficient and the removal of the oil becomes insufficient. There is a risk that it is difficult to continue the biological treatment in the subsequent stage. Such a concern also occurs in the oil-containing wastewater of beans such as cacao, sesame and soybeans having a high organic matter concentration other than coffee.
[0004]
The present invention has been made in order to solve such problems, and the bean wastewater treatment method and the bean wastewater treatment in which the oil content of the bean koji press filtrate is reliably removed and the subsequent biological treatment is stably performed. An object is to provide an apparatus.
[0005]
[Means for Solving the Problems]
The bean wastewater treatment method according to the present invention performs a biological treatment on the water to be treated by using the facility wastewater generated by the production of beans as the treated water, and performs a flocculation separation process on the treated water subjected to the biological treatment, Separated into separated treated water, the bean koji press filtrate produced in the production of beans is mixed with a flocculant to produce a mixed liquid containing agglomerated sludge and agglomerated treated water. The agglomerated sludge thus mixed is dehydrated and separated into dehydrated sludge and dehydrated filtrate, and this dehydrated filtrate is mixed with the water to be treated.
[0006]
Further, the bean wastewater treatment apparatus according to the present invention includes a biological treatment tank that performs biological treatment on the treated water using the facility wastewater generated in the production of beans as treated water, and the treated water and flocculant subjected to this biological treatment. An agglomerated sludge production tank that produces a mixed liquid containing agglomerated sludge and agglomerated treated water, and a solid-liquid separation device that separates the mixed liquid of the agglomerated sludge production tank into agglomerated sludge and separated treated water. A bean koji press filtrate agglomeration reaction tank for mixing a bean koji press filtrate and a flocculant produced in the production of beans to produce a mixed liquid containing agglomerated sludge and coagulated water, and this bean koji press filtrate agglomeration reaction tank A mixing tank that mixes the mixed liquid and the coagulated sludge separated by the solid-liquid separator, a dehydrator that dehydrates the mixed liquid in the mixing tank and separates it into a dehydrated sludge and a dehydrated filtrate, and the dehydrated filtrate. Dehydration filter supplied to be mixed with the water to be treated Comprising comprising a supply line, a.
[0007]
According to such a legume wastewater treatment method and a legume wastewater treatment apparatus, the legume squeezed filtrate and the flocculant are mixed, so that agglomerated sludge (floc) is formed. Part of the oil is taken up. The mixed liquid containing the coagulated sludge is mixed with the coagulated sludge obtained by subjecting the facility wastewater to biological treatment and coagulation separation treatment, so that the remaining oil in the bean koji press filtrate is adsorbed to the coagulated sludge to be mixed. The For this reason, all the oil components of the bean koji pressing filtrate are taken up into the sludge. All the oil components are separated from the dehydrated filtrate together with the dehydrated sludge along with the dehydration, and this dehydrated filtrate is mixed with the water to be treated to be subjected to biological treatment.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a legume wastewater treatment method and a legume wastewater treatment apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a coffee wastewater treatment apparatus that employs a coffee wastewater treatment method according to the present invention.
[0009]
The coffee wastewater treatment apparatus of the present embodiment purifies the facility wastewater and coffee grounds press filtrate as coffee wastewater generated in the production of coffee, and is generally installed from upstream to downstream (from the left side to the right side in the figure). Raw water adjustment tank 11 for storing wastewater, anaerobic treatment tank 12 and aerobic treatment tank 13 as biological treatment tanks, mixing tank 14 and agglomeration tank 15 as agglomerated sludge generation tanks, and agglomeration sedimentation tank 21 as a solid-liquid separation device The sand filtration tank 22 and the activated carbon adsorption tower 24 are connected in this order, and the coffee cake press filtrate pit 31, the coffee cake press filtrate agglomeration reaction tank 32 for storing the coffee cake press filtrate, and the sludge storage tank 23 as a mixing tank. The dehydrator 33 and the dewatered sludge container 34 are connected in this order, and the sludge storage tank 23 is connected to the coagulation sedimentation tank 21 and the raw water adjustment tank 11 is connected to the dehydrator 33. Formed by people connected.
[0010]
The raw water adjustment tank 11 stores the facility wastewater supplied via the line L1. This facility drainage is drainage generated when washing the coffee beans, crushed grains obtained by crushing coffee beans, sugar, milk and the like. The facility waste water in the raw water adjustment tank 11 is supplied to the anaerobic treatment tank 12 through the line L2 as treated water.
[0011]
The anaerobic treatment tank 12 performs biological treatment (anaerobic treatment) by the UASB method, which is one of the methane fermentation methods, in an anaerobic atmosphere, and COD (Chemical Oxygen) contained in the treated water. Demand), BOD (Biochemical Oxygen Demand) and other organic substances are methane-fermented and converted to methane gas. In this UASB method, granule methane bacteria as immobilized bacteria formed by self-immobilizing methane bacteria are used, and due to the activity of granule methane bacteria in the granule sludge zone formed in the anaerobic treatment tank 12 Organic matter is methane-fermented. In addition, when an oil component adheres to granule methane bacteria, while the activity of granule methane bacteria will fall, the said granule methane bacteria will float on a liquid surface, will flow out to a back | latter stage, and it will become difficult to continue anaerobic treatment.
[0012]
Methane gas generated by methane fermentation in the anaerobic treatment tank 12 is discharged through a line (not shown) and used as fuel, while the treated water in the anaerobic treatment tank 12 is aerobic through the line L3. It is supplied to the treatment tank 13.
[0013]
The aerobic treatment tank 13 performs aerobic treatment on the treated water in the anaerobic treatment tank 12 to decompose organic matter remaining without being biologically treated by the methane fermentation method. The treated water in the aerobic treatment tank 13 is supplied to the mixing tank 14 via a line L4.
[0014]
The mixing tank 14 is an agglomerated sludge in which chromaticity components are aggregated by adding an inorganic flocculant such as FeCl ₃ to the treated water of the aerobic treatment tank 13 via a line L15 and stirring with a stirrer 18. As a result, a mixed liquid containing the agglomerated sludge (fine flock) and the agglomerated water is produced. The liquid mixture generated in the mixing tank 14 is supplied to the aggregation tank 15.
[0015]
The agglomeration tank 15 adds, for example, an anionic polymer flocculant to the mixed liquid in the mixing tank 14 via the line L16, and agitation with the agitator 19, thereby coarsening the fine flocs as agglomerated sludge. Coarse floc is formed, and a mixed liquid containing the coagulated sludge (coarse floc) and coagulated water is generated. The mixed solution generated in the coagulation tank 15 is supplied to the coagulation sedimentation tank 21 via the line L5.
[0016]
The coagulation sedimentation tank 21 separates the mixed liquid in the coagulation tank 15 into solid and liquid, and separates it into separation treated water and coagulation sludge (coagulation sludge) containing chromaticity components. The coagulated sludge that is separated by solid-liquid separation in the coagulation sedimentation tank 21 is supplied to the sludge storage tank 23 via the line L7. On the other hand, the separation treated water in the coagulation sedimentation tank 21 is supplied to the sand filtration tank 22 via the line L6.
[0017]
The sand filtration tank 22 clarifies and filters the treated water, and captures fine suspension such as SS (Suspended Solids). The separated filtrate in the sand filtration tank 22 is supplied to the activated carbon adsorption tower 24 via a line L8.
[0018]
The activated carbon adsorption tower 24 performs activated carbon adsorption treatment of the separated filtrate and captures remaining chromaticity components and organic substances such as COD. The activated carbon adsorption treated water of the activated carbon adsorption tower 24 is supplied to a treated water tank (not shown) and appropriately discharged after sterilization.
[0019]
By the way, the crushed grains formed by crushing roasted coffee beans are put into an extraction kettle and steam is passed through the extraction kettle to extract the coffee extract, while the coffee extract is extracted. The crushed grains are discharged as a coffee cake containing water, and this coffee cake is separated into a coffee cake compressed filtrate containing a large amount of solid components and oil by draining with a screw press or the like, for example.
[0020]
This coffee cake press filtrate is stored in the coffee cake press filtrate pit 31. The coffee squeezed filtrate pit 31 in the coffee squeezed filtrate pit 31 is supplied to the coffee squeeze pressed filtrate agglomeration reaction tank 32 via a line L9.
[0021]
The coffee squeezed filtrate flocculation reaction tank 32 interposed between the coffee squeeze filtrate pit 31 and the sludge storage tank 23 is a feature of this embodiment, and an inorganic flocculant is added to the tank 32. A line L10 is provided as an inorganic flocculant supply line, and a stirrer 35 that stirs the inside of the tank 32 to promote the formation of floc (flocculated sludge). The flocculent sludge (floc) is added according to the addition and stirring of the inorganic flocculant. ) And an agglomerated water. Here, as the inorganic flocculant to be added, from the viewpoint of oil removal performance, chromaticity component removal performance, running cost, and the like, an iron-based material is preferable to an aluminum-based material, and for example, ferric chloride is preferably employed. . Further, a polymer flocculant may be added in place of the inorganic flocculant. As the polymer flocculant, for example, an anionic flocculant is preferable. And the liquid mixture produced | generated by this coffee lees press squeezing filtrate aggregation reaction tank 32 is supplied to the said sludge storage tank 23 via the line L11.
[0022]
The sludge storage tank 23 is supplied with the mixed liquid of the coffee squeezed filtrate agglomeration reaction tank 32 and, as described above, the coagulated sludge separated and solid-liquid separated in the agglomeration sedimentation tank 21 is supplied via the line L7. Is done. This sludge storage tank 23 mixes these liquid mixture and sedimentation sludge by stirring with the stirring apparatus 36. FIG. The mixed liquid in the sludge storage tank 23 is supplied to the dehydrator 33 via the line L12.
[0023]
The dehydrator 33 performs a dehydration process on the mixed liquid and separates it into dehydrated sludge and dehydrated filtrate. This dewatered sludge is supplied to the dewatered sludge container 34 via the line L13 and is appropriately discharged out of the system. On the other hand, the dehydrated filtrate is supplied as the water to be treated to the raw water adjusting tank 11 through a line L14 as a dehydrated filtrate supply line.
[0024]
According to the coffee wastewater treatment apparatus configured as described above, the coffee grounds pressed filtrate in the coffee grounds pressed filtrate pit 31 is supplied to the coffee grounds pressed filtrate agglomeration reaction tank 32 before being supplied to the sludge storage tank 23. Since a flocculant is added to the coffee lees press filtrate and the coagulation treatment is performed, coagulated sludge (floc) is formed, and a part of the oil content of the coffee lees press filtrate is taken into the coagulated sludge. Since the mixed liquid containing the coagulated sludge is mixed with the coagulated sludge in the subsequent sludge storage tank 23, the remaining oil in the coffee koji pressed filtrate is adsorbed by the coagulated sludge. For this reason, all the oil content of the coffee lees press filtrate is taken in sludge.
[0025]
All the oil components are separated from the dehydrated filtrate together with the dewatered sludge along with the dewatering by the dehydrator 33 and discharged out of the system. Therefore, in this embodiment, the oil content of the coffee grounds press filtrate is reliably removed.
[0026]
On the other hand, the dehydrated filtrate separated from the dewatered sludge by the dehydrator 33 is supplied to the raw water adjustment tank 11 via the line L14 and mixed with the facility wastewater of the raw water adjustment tank 11, and is anaerobic in the anaerobic treatment tank 12. Processing is performed.
[0027]
At this time, since the dehydrated filtrate to be mixed does not contain oil, there is no decrease in the activity of granule methane bacteria and there is no outflow on the liquid surface, and organic matter is actively fermented with methane. The treated water is then subjected to aerobic treatment and coagulation sedimentation treatment.
[0028]
As described above, in this embodiment, the coagulated sludge (floc) is formed in the coffee koji pressed filtrate agglomeration reaction tank 32, and a part of the oil content of the coffee koji pressed filtrate is taken into this agglomerated sludge, and the sludge storage tank 23 is formed. Then, the remaining oil content of the coffee cake press filtrate is adsorbed to the settling sludge, so that all the oil content of the coffee cake press filtrate is taken into the sludge, and all this oil content is fed to the dehydrated filtrate supplied to the raw water adjustment tank. Therefore, even if there is a large amount of oil in the coffee koji press filtrate and there is a shortage of sedimentation sludge, the oil in the coffee koji press filtrate is surely removed, and the biological treatment in the subsequent stage is stabilized. Can be implemented.
[0029]
As mentioned above, although this invention was demonstrated concretely based on the embodiment, this invention is not limited to the said embodiment, For example, in the said embodiment, the coffee lees pressing filtrate pit 31 and the sludge storage tank 23 are demonstrated. A coffee squeezed filtrate agglomeration reaction tank 32 is interposed therebetween, and a flocculant is added to the coffee squeeze pressure filtrate agglomeration reaction tank 32. The flocculant may be added to the line L9, and the flocculant may be added to the line that supplies the coffee sludge compressed filtrate to the sludge storage tank 23 without the coffee lees press filtrate coagulation reaction tank 32. .
[0030]
In the above embodiment, the dehydrated filtrate is supplied to the raw water adjustment tank 11 via the line L14. However, the facility wastewater may be supplied to the line L2 that supplies the anaerobic treatment tank 12. In short, it is only necessary that the dehydrated filtrate can be supplied so as to be mixed with the water to be treated (equipment wastewater).
[0031]
Moreover, in the said embodiment, although the solid-liquid separation apparatus is made into the coagulation sedimentation tank 21, what is necessary is just the solid-liquid separation apparatus which carries out solid-liquid separation into the coagulation sludge and the separation process water.
[0032]
Furthermore, in the said embodiment, although application with respect to coffee was described, it is applicable similarly to beans other than coffee, for example, cacao, sesame, soybeans.
[0033]
【The invention's effect】
The bean waste water treatment method and the bean waste water treatment apparatus according to the present invention form a coagulated sludge (floc) by mixing the bean koji press filtrate and the flocculant, and the oil content of the bean koji press filtrate is added to the coagulated sludge. Agglomeration that mixes the remaining oil in the legume squeezed filtrate by taking a part and mixing the mixed liquid containing this agglomerated sludge with the agglomerated sludge obtained by subjecting the equipment wastewater to biological treatment and agglomeration separation treatment By adsorbing to sludge, it is possible to take in all the oil content of the beans squeezed filtrate into the sludge, and all this oil content is separated from the dehydrated filtrate together with the dehydrated sludge as dewatered, and this dehydrated filtrate is Since it is mixed with the water to be treated, biological oil treatment will ensure that the oil content of the bean squeezed filtrate is removed, and the subsequent biological treatment can be carried out stably. It becomes.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a coffee wastewater treatment apparatus employing a coffee wastewater treatment method according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Raw water adjustment tank, 12 ... Anaerobic treatment tank (biological treatment tank), 13 ... Aerobic treatment tank (biological treatment tank), 14 ... Mixing tank (coagulation sludge production tank), 15 ... Coagulation tank (coagulation sludge production tank) ), 21 ... Coagulation sedimentation tank (solid-liquid separator), 23 ... Sludge storage tank (mixing tank), 32 ... Coffee squeeze filtrate flocculation reaction tank, 33 ... Dehydrator, L10 ... Inorganic flocculant supply line, L14 ... Dehydration Filtrate supply line.

Claims

Treating the treated water with the treated wastewater generated from the production of beans as treated water,
The treated water subjected to this biological treatment is subjected to agglomeration and separation treatment to separate the agglomerated sludge and the separated treated water,
A bean koji press filtrate produced with the production of beans and a flocculant are mixed to produce a mixed liquid containing agglomerated sludge and agglomerated water,
The mixed liquid and the agglomerated sludge separated by the agglomeration separation process are mixed and dehydrated to separate into a dehydrated sludge and a dehydrated filtrate,
A bean wastewater treatment method comprising mixing the dehydrated filtrate with the water to be treated.

A biological treatment tank that biologically treats the treated water as the treated water, which is the wastewater generated from the production of beans;
An agglomerated sludge production tank that mixes the treated water and the flocculant subjected to the biological treatment to produce a mixed liquid containing the agglomerated sludge and the agglomerated treated water;
A solid-liquid separation device for solid-liquid separation of the mixed liquid of the agglomerated sludge generation tank into agglomerated sludge and separated treated water;
A bean koji pressed filtrate agglomeration reaction tank for mixing a bean koji pressed filtrate and a flocculant produced in the production of beans to produce a mixed liquid containing coagulated sludge and coagulated water;
A mixing tank for mixing the mixed liquid of the bean koji press filtrate agglomeration reaction tank and the agglomerated sludge separated by the solid-liquid separator;
A dehydrator for dehydrating the mixed liquid in this mixing tank and separating it into dehydrated sludge and dehydrated filtrate;
A dehydrated filtrate supply line for supplying the dehydrated filtrate to be mixed with the water to be treated;
Legume wastewater treatment equipment.