JP2011177608A5

JP2011177608A5 -

Info

Publication number: JP2011177608A5
Application number: JP2010041587A
Authority: JP
Filing date: 2010-02-26
Publication date: 2013-04-11
Anticipated expiration: 2030-02-26

Description

かかる目的を達成するために、本発明の油分含有廃水の処理方法は、下記に示すとおりで構成される。
（１）原水を活性汚泥処理する生物処理槽内に浸漬型分離膜を配置し、該浸漬型分離膜の下方に散気装置を配置して連続的に曝気を行い、生物処理槽内の活性汚泥を含む処理混合液を生物処理槽内で浸漬型分離膜により膜ろ過分離処理する膜分離活性汚泥法で、油分を含む原水を膜ろ過する際において、
原水中に含まれる油分の生物分解性の有無を判断し、
生物分解性「有」の場合には、油分を含む原水のBOD-SS負荷を調査し、その値が適正な範囲にあれば運転可能と判断し、不適な範囲なら油分除去の前処理を導入する、
その一方、生物分解性「無」の場合には、原水中に含まれる油分の動粘度を調査して油分の許容負荷量を算出し、その値が許容内であれば運転可能と判断し、許容外であれば油分除去の前処理を導入する、
ことを特徴とする運転条件および／または設計条件を決定する油分含有廃水の処理方法。
（２）油分の生物分解性の有無を判断する際、BOD/TODの数値が50%以上の場合に生物分解性「有」と判断し、50%未満の場合には生物分解性「無」と判断することを特徴とする（１）に記載の油分含有廃水の処理方法。
（３）油分を含む原水のBOD-SS負荷の値が0.01〜0.4（kgBOD/ kgSS・d）の場合に、運転可能と判断することを特徴とする、（１）または（２）に記載の油分含有廃水の処理方法。
（４）油分除去の前処理が浮上分離法、凝集ろ過、担体吸着法から選ばれることを特徴とする（１）〜（３）のいずれかに記載の油分含有廃水の処理方法。
In order to achieve this object, the method for treating oil-containing wastewater of the present invention is configured as follows.
(1) An immersion type separation membrane is placed in a biological treatment tank that treats raw water with activated sludge, an aeration device is placed under the immersion type separation membrane, and aeration is continuously performed. In the membrane separation activated sludge method in which the treatment liquid mixture containing sludge is subjected to membrane filtration separation treatment with a submerged separation membrane in a biological treatment tank, when raw water containing oil is membrane filtered,
Determine the biodegradability of the oil contained in the raw water,
If it is biodegradable, investigate the BOD-SS load of the raw water containing oil, and if the value is within the proper range, it is judged that it can be operated, and if it is unsuitable, pretreatment for oil removal is introduced. To
On the other hand, if the biodegradability is “no”, the kinematic viscosity of the oil contained in the raw water is investigated and the allowable load of the oil is calculated. If it is not acceptable, introduce pretreatment for oil removal.
An oil-containing wastewater treatment method for determining operating conditions and / or design conditions.
(2) When judging the presence or absence of biodegradability of oil, biodegradability is judged as “Yes” if the BOD / TOD value is 50% or more, and biodegradability is “None” if it is less than 50%. (1) The method for treating oil-containing wastewater according to (1).
(3) When the value of the BOD-SS load of the raw water containing oil is 0.01 to 0.4 (kgBOD / kgSS · d), it is determined that the operation is possible, as described in (1) or (2) Treatment method for oil-containing wastewater.
(4) The method for treating oil-containing wastewater according to any one of (1) to (3), wherein the pretreatment for oil removal is selected from a flotation separation method, a coagulation filtration, and a carrier adsorption method.

Claims

A submerged separation membrane is disposed in a biological treatment tank that treats raw water with activated sludge, and an aeration device is disposed below the submerged separation membrane for continuous aeration, including activated sludge in the biological treatment tank. In membrane separation activated sludge method that performs membrane filtration separation treatment with a submerged type separation membrane in a biological treatment tank, when the raw water containing oil is membrane filtered,
Determine the biodegradability of the oil contained in the raw water,
If it is biodegradable, investigate the BOD-SS load of the raw water containing oil, and if the value is within the proper range, it is judged that it can be operated, and if it is unsuitable, pretreatment for oil removal is introduced. To
On the other hand, if the biodegradability is “no”, the kinematic viscosity of the oil contained in the raw water is investigated and the allowable load of the oil is calculated. If it is not acceptable, introduce pretreatment for oil removal.
An oil-containing wastewater treatment method for determining operating conditions and / or design conditions.

When judging the presence or absence of biodegradability of oil, if the BOD / TOD value is 50% or more, it is judged as biodegradable, and if it is less than 50%, it is judged as biodegradable. The method for treating oil-containing wastewater according to claim 1.

The treatment of oil-containing wastewater according to claim 1 or 2, characterized in that it is judged to be operable when the BOD-SS load value of the raw water containing oil is 0.01 to 0.4 (kgBOD / kgSS · d). Method.

The method for treating oil-containing wastewater according to any one of claims 1 to 3, wherein the pretreatment for oil removal is selected from a flotation separation method, a coagulation filtration, and a carrier adsorption method.