JP4516330B2 - 油脂含有汚濁物質の嫌気性処理方法及び装置 - Google Patents
油脂含有汚濁物質の嫌気性処理方法及び装置 Download PDFInfo
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- JP4516330B2 JP4516330B2 JP2004055996A JP2004055996A JP4516330B2 JP 4516330 B2 JP4516330 B2 JP 4516330B2 JP 2004055996 A JP2004055996 A JP 2004055996A JP 2004055996 A JP2004055996 A JP 2004055996A JP 4516330 B2 JP4516330 B2 JP 4516330B2
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Description
1. 油脂含有汚濁物質の嫌気性処理工程において、反応槽汚泥中のプロピオン酸濃度をモニターし、モニターされたプロピオン酸濃度に応じてフマル酸を添加することを特徴とする油脂含有汚濁物質の嫌気性処理方法。
本実施例及び比較例は、油脂含有排水を低温で貯留することによりプロピオン酸の生成が抑制できることを示すものである。
油脂含有排水として、市販の豆乳を希釈(豆乳:水=1:3.8で希釈、CODCr=38.9g/L、ヘキサン抽出物質5〜6g/L、中性脂肪2〜3g/L、高級脂肪酸0.4〜1.3g/L)したものを用いた。油脂含有排水を、貯留槽で35℃で1〜4日間貯留した後、油脂分解酵素リパーゼによって50℃で前処理した後、有効容積30Lのメタン発酵槽に連続供給した。リパーゼによる酵素前処理においては、有効容積2.0Lの酵素前処理槽で、リパーゼ(5KU/L)によって、50℃、HRT=2.2〜2.6日の条件下で前処理を行なった。
油脂含有廃棄物として、中性脂肪と高級脂肪酸を高濃度に含有するコーヒー粕粉砕液を用いた。コーヒー粕粉砕液原水の性状を表2に示す。
Claims (12)
- 反応槽汚泥中のプロピオン酸濃度をモニターし、モニターされたプロピオン酸濃度に応じてフマル酸を添加する油脂含有汚濁物質の嫌気性処理方法であって、
油脂含有汚濁物質の嫌気性処理工程の前段として、当該油脂含有汚濁物質を15℃以下の温度で貯留する工程、及び/又は、当該油脂含有汚濁物質を15℃以下の温度で酸発酵処理にかける工程を含むことを特徴とする嫌気性処理方法。 - 前記貯留及び/又は前記酸発酵処理の工程は4℃〜15℃の温度で行われることを特徴とする請求項1に記載の嫌気性処理方法。
- 更に、前記油脂含有汚濁物質を油脂分解酵素又はその酵素を生成する微生物体と作用させて分解する前処理工程を含むことを特徴とする請求項1又は2に記載の嫌気性処理方法。
- 前記油脂含有汚濁物質の嫌気性処理工程において、反応槽汚泥中の酢酸濃度をモニターして、酢酸濃度が所定の範囲内に保持されるように汚泥の返送量を調整することを特徴とする請求項1〜3のいずれかに記載の嫌気性処理方法。
- 前記油脂含有汚濁物質の嫌気性処理工程において、反応槽汚泥中の高級脂肪酸濃度をモニターして、高級脂肪酸濃度が所定の範囲内に保持されるように栄養源及び/又はグルコースを添加することを特徴とする請求項1〜4のいずれかに記載の嫌気性処理方法。
- 前記嫌気性処理工程が高温メタン発酵を含むことを特徴とする請求項1〜5のいずれかに記載の嫌気性処理方法。
- 油脂含有汚濁物質の嫌気性処理装置であって、
油脂含有汚濁物質貯留槽と;
当該油脂含有汚濁物質貯留槽内の油脂含有汚濁物質を導入して、当該油脂含有汚濁物質を15℃以下の温度で貯留するか及び/又は当該油脂含有汚濁物質を15℃以下の温度で酸発酵処理させる前処理槽と;
当該前処理槽で処理された油脂含有汚濁物質を導入して嫌気性処理するための嫌気反応槽と;
フマル酸を貯留する薬液槽と;
当該薬液槽内のフマル酸を当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給するための配管と;
を具備し、更に、
嫌気反応槽内の汚泥中のプロピオン酸濃度を測定する手段と;
測定されたプロピオン酸濃度の値に応じて、当該薬液槽から当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給するフマル酸の量を調整する手段と;
を有することを特徴とする装置。 - 油脂含有汚濁物質の嫌気性処理装置であって、
油脂含有汚濁物質貯留槽と;
当該油脂含有汚濁物質貯留槽内の油脂含有汚濁物質を導入して、油脂含有汚濁物質を15℃以下の温度で貯留するか及び/又は当該油脂含有汚濁物質を15℃以下の温度で酸発酵処理させる前処理を行う前処理槽と;
当該前処理槽で処理された油脂含有汚濁物質を導入して嫌気性処理するための嫌気反応槽と;
油脂分解製剤として油脂分解酵素又はその酵素を生成する微生物体の溶液を貯留する油脂分解製剤貯留槽と;
当該油脂分解製剤貯留槽内の油脂分解製剤を当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽に供給する配管と;
フマル酸を貯留する薬液槽と;
当該薬液槽内のフマル酸を当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給するための配管と;
を具備し、更に、
当該嫌気反応槽内の汚泥中のプロピオン酸濃度を測定する手段と;
測定されたプロピオン酸濃度の値に応じて、当該薬液槽から当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給するフマル酸の量を調整する手段と;
を有することを特徴とする装置。 - 油脂含有汚濁物質の嫌気性処理装置であって、
油脂含有汚濁物質貯留槽と;
当該油脂含有汚濁物質貯留槽内の油脂含有汚濁物質を導入して、当該油脂含有汚濁物質を15℃以下の温度で貯留するか及び/又は当該油脂含有汚濁物質を15℃以下の温度で酸発酵処理させる前処理を行う前処理槽と;
当該前処理槽で処理された油脂含有汚濁物質を導入して嫌気性処理するための嫌気反応槽と;
油脂分解製剤として油脂分解酵素又はその酵素を生成する微生物体の溶液を貯留する油脂分解製剤貯留槽と;
当該油脂分解製剤貯留槽内の油脂分解製剤を当該前処理槽に供給する配管と;
フマル酸を貯留する薬液槽と;
栄養液及び/又はグルコースを貯留する栄養液槽と;
当該薬液槽内のフマル酸を当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給するための配管と;
当該栄養液槽内の栄養液及び/又はグルコースを当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給するための配管と;
を具備し、更に、
当該嫌気反応槽内の汚泥中のプロピオン酸濃度を測定する手段と;
測定されたプロピオン酸濃度の値に応じて、当該薬液槽から当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給するフマル酸の量を調整する手段と;
当該嫌気反応槽内の汚泥中の高級脂肪酸濃度を測定する手段と;
測定された高級脂肪酸濃度の値に応じて、当該栄養液槽から当該油脂含有汚濁物質貯留槽及び/又は当該前処理槽及び/又は当該嫌気反応槽に供給する栄養液及び/又はグルコースの量を調整する手段と;
を有することを特徴とする装置。 - 前記前処理槽の温度は4℃〜15℃である、請求項7〜9のいずれかに記載の装置。
- 前記嫌気反応槽から排出される汚泥混合液を受容して汚泥と分離液とに分離する汚泥沈殿槽と;
当該汚泥沈殿槽から排出される沈殿汚泥の一部を前記嫌気反応槽及び/又は前記前処理槽に返送する配管と;
を更に具備する請求7〜10のいずれかに記載の装置。 - 前記嫌気反応槽内の汚泥中の酢酸濃度を測定する手段と;
測定された酢酸濃度の値に応じて、前記汚泥沈殿槽から前記嫌気反応槽及び/又は前記前処理槽へ返送する汚泥の量を調整する手段と;
を更に具備する請求項11に記載の装置。
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