JP2014180594A - Kraft pulp wastewater treatment method and apparatus - Google Patents
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
本発明は、クラフトパルプ排水、即ち、クラフトパルプ工場より排出される有機性排水を処理する方法及び装置に関する。 The present invention relates to a method and apparatus for treating kraft pulp wastewater, ie, organic wastewater discharged from a kraft pulp mill.
従来、クラフトパルプ工場より排出されるクラフトパルプ排水の処理法として、好気性菌を用いた好気処理法が広く用いられている。しかし、好気処理法はエネルギー消費量が多く、また余剰汚泥の処理が問題となる。一方、嫌気処理法は食品産業などの高濃度排水の処理に利用されており、好気処理法と比較して曝気が不要であるためエネルギー消費が低く、汚泥発生量が少ないといったメリットがある。また、排水処理後に発生するメタンガスをエネルギーとして利用可能である点においても有利である。 Conventionally, an aerobic treatment method using aerobic bacteria has been widely used as a method for treating kraft pulp wastewater discharged from a kraft pulp factory. However, the aerobic treatment method has a large energy consumption, and the treatment of excess sludge becomes a problem. On the other hand, the anaerobic treatment method is used for the treatment of high-concentration wastewater in the food industry and the like, and has an advantage that energy consumption is low and sludge generation is small because aeration is unnecessary compared with the aerobic treatment method. It is also advantageous in that methane gas generated after wastewater treatment can be used as energy.
嫌気処理法の改良法として、嫌気グラニュールを用いた上向流嫌気性汚床法（ＵＡＳＢ法）が開発されており、特許文献１には、クラフトパルプ排水をＵＡＳＢ法で嫌気処理する方法として、クラフトパルプ排水中のイオウ分を除去した後、該排水と高分子炭水化物を含有する排水とを混合し、これをメタン発酵リアクターに供給する方法が提案されている。 As an improved method of the anaerobic treatment method, an upflow anaerobic sewage method (UASB method) using anaerobic granules has been developed. Patent Document 1 discloses a method for anaerobically treating kraft pulp wastewater by the UASB method. A method has been proposed in which the sulfur content in kraft pulp waste water is removed, and then the waste water and waste water containing a high molecular weight carbohydrate are mixed and supplied to a methane fermentation reactor.
クラフトパルプ排水には多量の油脂、メタノール、イオウ分、樹脂酸などの菌体阻害物が含まれており、嫌気グラニュールの解体や処理不良を引き起こす。そのため、クラフトパルプ排水の処理のための嫌気処理槽を立ち上げるには、原水を４倍に希釈した希釈クラフトパルプ排水を４ヶ月以上通水するという低負荷立ち上げ運転を行うようにしており、立ち上げ期間が長いものとなっていた。 Kraft pulp wastewater contains a large amount of fats and oils, methanol, sulfur, resin acid and other fungal inhibitors, which causes disorganization and poor processing of anaerobic granules. Therefore, in order to set up an anaerobic treatment tank for the treatment of kraft pulp wastewater, a low-load start-up operation is carried out in which diluted kraft pulp wastewater obtained by diluting raw water four times is passed for more than four months. The launch period was long.
特許文献２には、クラフトパルプ排水を処理するための嫌気処理槽の立ち上げ期間を短縮するクラフトパルプ排水の処理方法として、クラフトパルプ排水を、非生物流動性担体を充填した嫌気処理槽に供給して嫌気処理するクラフトパルプ排水の処理方法において、該嫌気処理槽を立ち上げるに際し、ＣＯＤ除去率が所定値となるように、クラフトパルプ排水を希釈水で希釈して該嫌気処理槽に供給すると共に、この希釈水として嫌気処理水を好気処理した好気処理水を用いる方法が記載されている。
In
このようにクラフトパルプ排水を処理するための嫌気処理槽の立ち上げに際して、非生物流動性担体を収容した嫌気処理槽に希釈クラフトパルプ排水を供給し、この希釈倍率を徐々に低くすることにより嫌気処理槽の立ち上げが早くなる。 Thus, when starting an anaerobic treatment tank for treating kraft pulp wastewater, the diluted kraft pulp wastewater is supplied to the anaerobic treatment tank containing the non-biological fluid carrier, and the dilution rate is gradually lowered to anaerobic. Start-up of the treatment tank is quicker.
特許文献２では、嫌気処理槽の立ち上げ時は処理能力をＣＯＤ濃度（測定に２時間程度かかる）で判断し、少しずつ排水濃度を上げていく（００１９，００２０段落）。
In
嫌気処理槽が立ち上がり、安定運転時になると、嫌気処理槽の処理能力は高くなっているが、負荷変動により過負荷になると安定運転が妨げられる。そのため、嫌気処理槽が過負荷とならないように嫌気処理槽負荷を制御することが重要となる。ところが、安定運転時においても、立ち上げ時から継続してＣＯＤを指標にして負荷を制御すると、ＣＯＤ測定には長時間（約２時間）を要するので、負荷変動に迅速に対応することができない。 When the anaerobic treatment tank rises and is in stable operation, the treatment capacity of the anaerobic treatment tank is high, but stable operation is hindered when it is overloaded by load fluctuation. Therefore, it is important to control the anaerobic treatment tank load so that the anaerobic treatment tank is not overloaded. However, even during stable operation, if the load is controlled using COD as an index from the start-up, COD measurement takes a long time (about 2 hours), so it cannot respond quickly to load fluctuations. .
また、クラフトパルプ排水は硫化物を含み、ＣＯＤの場合は硫化物も検出するため、クラフトパルプ排水濃度を正確に測定することができないので、負荷変動に正確に対応することができない。 In addition, kraft pulp wastewater contains sulfides, and in the case of COD, sulfide is also detected. Therefore, the kraft pulp wastewater concentration cannot be measured accurately, and therefore it cannot accurately cope with load fluctuations.
本発明は、クラフトパルプ排水を含む被処理水を、非生物流動性担体を充填した嫌気処理槽に供給して嫌気処理するクラフトパルプ排水の処理方法において、該嫌気処理槽の処理能力を維持し、安定運転するために、ＴＯＣ濃度が所定値となるように、クラフトパルプ排水を希釈水で希釈して該嫌気処理槽に供給すると共に、この希釈水として嫌気処理水を好気処理した好気処理水を用いる方法において、負荷変動に迅速に対応して効率よく安定して処理することができるクラフトパルプ排水の処理方法及び装置を提供することを目的とする。 The present invention provides a kraft pulp wastewater treatment method in which treated water containing kraft pulp wastewater is supplied to a anaerobic treatment tank filled with a non-biological fluid carrier and anaerobic treatment is performed, and the treatment capacity of the anaerobic treatment tank is maintained. In order to stably operate, the kraft pulp waste water is diluted with diluted water and supplied to the anaerobic treatment tank so that the TOC concentration becomes a predetermined value, and anaerobic treated with anaerobic treated water as the diluted water. An object of the present invention is to provide a kraft pulp wastewater treatment method and apparatus capable of dealing with load fluctuations quickly and efficiently and stably in a method using treated water.
本発明のクラフトパルプ排水の処理方法は、クラフトパルプ排水を含む被処理水を、非生物流動性担体を充填した嫌気処理槽に供給して嫌気処理するクラフトパルプ排水の処理方法において、該嫌気処理槽に供給する被処理水のＴＯＣ濃度を１００〜３００ｍｇ／Ｌに制御することを特徴とする。 The kraft pulp wastewater treatment method of the present invention is a kraft pulp wastewater treatment method in which the water to be treated containing kraft pulp wastewater is supplied to a anaerobic treatment tank filled with a non-biological fluid carrier and anaerobically treated. The TOC concentration of the water to be treated supplied to the tank is controlled to 100 to 300 mg / L.
本発明のクラフトパルプ排水の処理方法では、嫌気処理槽に供給する被処理水に希釈水を添加することにより前記ＴＯＣ濃度を制御することが好ましい。この場合、前記嫌気処理槽の処理水を好気性処理し、この好気性処理水を前記希釈水として用いてもよい。また、嫌気処理槽への供給水のＴＯＣを計測し、この計測されたＴＯＣ濃度が１００〜３００ｍｇ／Ｌとなるように前記希釈水の添加量を制御することが好ましい。 In the kraft pulp wastewater treatment method of the present invention, it is preferable to control the TOC concentration by adding dilution water to the treated water supplied to the anaerobic treatment tank. In this case, the treated water in the anaerobic treatment tank may be subjected to aerobic treatment, and this aerobic treated water may be used as the dilution water. Moreover, it is preferable to measure the TOC of the water supplied to the anaerobic treatment tank and control the amount of dilution water added so that the measured TOC concentration is 100 to 300 mg / L.
本発明のクラフトパルプ排水の処理装置は、クラフトパルプ排水を含む被処理水を、非生物流動性担体を充填した嫌気処理槽に供給して嫌気処理するクラフトパルプ排水の処理装置において、前記嫌気処理槽に供給される被処理水のＴＯＣを計測する計測手段と、該計測手段で計測されたＴＯＣ濃度が１００〜３００ｍｇ／Ｌとなるように前記被処理水に希釈水を添加する希釈水添加手段とを備えたものである。 The kraft pulp wastewater treatment apparatus of the present invention is a kraft pulp wastewater treatment apparatus for supplying an treated water containing kraft pulp wastewater to an anaerobic treatment tank filled with a non-biological fluid carrier and performing anaerobic treatment. Measuring means for measuring the TOC of water to be treated supplied to the tank, and dilution water adding means for adding dilution water to the water to be treated so that the TOC concentration measured by the measuring means is 100 to 300 mg / L It is equipped with.
本発明のクラフトパルプ排水の処理方法及び装置では、嫌気処理槽に供給する被処理水のＴＯＣ濃度を１００〜３００ｍｇ／Ｌに制御する。ＴＯＣは、有機炭素のみを検出するものであり、ＴＯＣ計により迅速に検出できるので、ＣＯＤ検出値に基づく制御に比べて負荷変動に迅速に対応することができ、クラフトパルプ排水を安定して処理することが可能となる。 In the kraft pulp wastewater treatment method and apparatus of the present invention, the TOC concentration of the water to be treated supplied to the anaerobic treatment tank is controlled to 100 to 300 mg / L. TOC detects only organic carbon and can be detected quickly with a TOC meter, so it can respond to load fluctuations more quickly than control based on the COD detection value, and can stably treat kraft pulp wastewater. It becomes possible to do.
嫌気処理槽に流入する被処理水に希釈水を添加することにより、クラフトパルプ排水のＴＯＣ変動に迅速に追従して該被処理水のＴＯＣ濃度を制御することができる。 By adding dilution water to the water to be treated flowing into the anaerobic treatment tank, the TOC concentration of the water to be treated can be controlled by quickly following the TOC fluctuation of the kraft pulp drainage.
本発明において処理対象となるクラフトパルプ排水は、クラフトパルプ工場より排出される有機排水であり、通常はＴＯＣ１３００〜２４００ｍｇ／Ｌ、ＣＯＤＣｒ５０００〜９０００ｍｇ／Ｌ程度である。 The kraft pulp wastewater to be treated in the present invention is an organic wastewater discharged from a kraft pulp factory, and is usually about TOC 1300-2400 mg / L and COD Cr 5000-9000 mg / L.
本発明では、このクラフトパルプ排水をまず必要に応じ希釈した後、ｐＨ６〜８にｐＨ調整するのが好ましい。ｐＨ調整を行う場合、酸又はアルカリを添加してｐＨ調整を行うｐＨ調整槽を設けるのが好ましいが、酸又はアルカリをライン添加してもよい。ｐＨ調整に用いる酸としては、塩酸、硫酸等が好適であり、アルカリとしては水酸化ナトリウム等が好適である。 In the present invention, it is preferable that the kraft pulp waste water is first diluted as necessary and then adjusted to pH 6-8. When pH adjustment is performed, it is preferable to provide a pH adjustment tank for adjusting pH by adding acid or alkali, but acid or alkali may be added in line. As the acid used for pH adjustment, hydrochloric acid, sulfuric acid and the like are suitable, and as the alkali, sodium hydroxide and the like are suitable.
排水の生分解性等の条件により異なるが、嫌気処理槽への流入水は、ｐＨ６〜８特に６．５〜７．５、温度２５〜４０℃特に３０〜３５℃であることが好ましい。クラフトパルプ排水は３５℃前後の場合が多いが、必要に応じて、ｐＨ調整槽に加温装置を設置する。嫌気処理槽への被処理水の流入速度はＨＲＴ２〜２４時間好ましくは２〜８時間が適当である。
Although it changes with conditions, such as biodegradability of waste water, it is preferable that the inflow water to an anaerobic processing tank is pH 6-8, especially 6.5-7.5, temperature 25-40 degreeC, especially 30-35 degreeC. Kraft pulp drainage is often around 35 ° C., but if necessary, a warming device is installed in the pH adjustment tank. The inflow rate of the water to be treated into the anaerobic treatment tank is
嫌気処理槽には非生物流動性担体を充填する。非生物流動性担体としては、比重、粒径の調整が容易な合成樹脂製担体が好ましく、粒径１〜５ｍｍ、好ましくは２．５〜４ｍｍ、沈降速度として２００〜５００ｍ／ｈをもつものが好ましいが、これに限定されない。非生物流動性担体を用いることにより、処理が安定し、高負荷運転が可能となる。嫌気処理槽は、攪拌機等を用いる完全混合型反応槽、水流と発生ガスにより槽内を混合する上向流型反応槽等が好適である。 The anaerobic treatment tank is filled with a non-biological fluid carrier. The non-biological fluid carrier is preferably a synthetic resin carrier whose specific gravity and particle size can be easily adjusted, and those having a particle size of 1 to 5 mm, preferably 2.5 to 4 mm, and a sedimentation speed of 200 to 500 m / h. Although preferable, it is not limited to this. By using a non-biological fluid carrier, the treatment is stable and high-load operation is possible. The anaerobic treatment tank is preferably a complete mixing type reaction tank using a stirrer or the like, an upward flow type reaction tank in which the inside of the tank is mixed with a water flow and generated gas, and the like.
本発明では、嫌気反応槽に流入する被処理水のＴＯＣ濃度が１００〜３００ｍｇ／Ｌ、好ましくは１００〜２５０ｍｇ／Ｌ特に好ましくは１２０〜２５０ｍｇ／Ｌとりわけ１５０〜２３０ｍｇ／Ｌとなるように必要に応じ希釈水を被処理水に添加する。具体的には、嫌気反応槽流入水をＴＯＣ計によりモニタリングし、嫌気反応槽流入水のＴＯＣ濃度が上記範囲を超えないように希釈水の添加を制御するのが好ましい。なお、嫌気反応槽に流入する被処理水のＴＯＣ濃度が３００ｍｇ／Ｌを超えると、過負荷となり、生物処理効率が低下すると共に、担体が浮上し易くなる。このＴＯＣ濃度が１００ｍｇ／Ｌよりも低いと、嫌気反応槽の滞留時間が非常に長くなる。また、希釈水を添加する場合にあっては、希釈水の添加量が徒に多くなる。 In the present invention, it is necessary that the TOC concentration of the water to be treated flowing into the anaerobic reaction tank is 100 to 300 mg / L, preferably 100 to 250 mg / L, particularly preferably 120 to 250 mg / L, especially 150 to 230 mg / L. Add diluted water to the treated water accordingly. Specifically, it is preferable to monitor the anaerobic reaction tank inflow water with a TOC meter and control the addition of dilution water so that the TOC concentration of the anaerobic reaction tank inflow water does not exceed the above range. In addition, when the TOC concentration of the water to be treated flowing into the anaerobic reaction tank exceeds 300 mg / L, overload occurs, the biological treatment efficiency decreases, and the carrier easily floats. When the TOC concentration is lower than 100 mg / L, the residence time in the anaerobic reaction tank becomes very long. Moreover, when adding dilution water, the addition amount of dilution water increases easily.
この希釈水としては、嫌気処理槽流出水を好気処理した好気処理水を用いてもよい。好気処理方式としては、活性汚泥法、担体流動法などを採用することができるが、これらに限定されない。ただし、希釈水としては工業用水や、低ＴＯＣ濃度の他の排水などを用いてもよい。希釈水の添加はｐＨ調整の前でも後でもよい。 As this dilution water, you may use the aerobic treatment water which carried out the aerobic treatment of the anaerobic treatment tank effluent. As an aerobic treatment method, an activated sludge method, a carrier flow method, or the like can be adopted, but the method is not limited thereto. However, industrial water or other waste water with a low TOC concentration may be used as the dilution water. Dilution water may be added before or after pH adjustment.
本発明では、嫌気処理水の一部を嫌気処理槽の前段に返送してもよい。この場合、返送量を嫌気処理槽への被処理水流入量に対して０．１〜１０倍、特に０．１〜５．０倍程度となるように調整する。これにより、被処理水の濃度変動に対応でき、アルカリ使用量の削減、嫌気処理の安定化、高効率化を図ることができる。 In the present invention, part of the anaerobic treated water may be returned to the front stage of the anaerobic treatment tank. In this case, the return amount is adjusted to be 0.1 to 10 times, particularly about 0.1 to 5.0 times the inflow amount of water to be treated into the anaerobic treatment tank. Thereby, it can respond to the density | concentration fluctuation | variation of to-be-processed water, and can aim at reduction of alkali usage, stabilization of anaerobic treatment, and high efficiency.
本発明では、嫌気処理槽の立ち上げ時は菌体量が少なく処理能力が低いため、立ち上げ開始時には嫌気処理槽流入水のＴＯＣ濃度を低くするように高倍率にて希釈水を添加し、希釈倍率を段階的に下げながら嫌気反応槽に流入する被処理排水のＴＯＣ濃度を上げていくことが好ましい。排水の流入速度を略一定とすることで、立ち上げ時の希釈水量を低減することができる。クラフトパルプ排水のＴＯＣ濃度は通常１３００〜２４００ｍｇ／Ｌ程度であり、立ち上げ時に最初に嫌気処理槽に供給する希釈クラフトパルプ排水のＴＯＣ濃度は１３０〜２４０ｍｇ／Ｌ程度とし、段階的に嫌気反応槽に流入する被処理排水のＴＯＣ濃度を上げるのが好ましい。 In the present invention, when the anaerobic treatment tank is started up, the amount of bacterial cells is small and the processing capacity is low, so at the start of the start-up, dilution water is added at a high magnification so as to reduce the TOC concentration of the anaerobic treatment tank inflow water, It is preferable to increase the TOC concentration of the wastewater to be treated flowing into the anaerobic reaction tank while gradually decreasing the dilution rate. By making the inflow speed of the waste water substantially constant, the amount of diluted water at the start-up can be reduced. The TOC concentration of kraft pulp wastewater is usually about 1300 to 2400 mg / L, and the TOC concentration of diluted kraft pulp wastewater first supplied to the anaerobic treatment tank at startup is about 130 to 240 mg / L. It is preferable to increase the TOC concentration of the wastewater to be treated flowing into the wastewater.
以下、本発明方法の実施に好適なクラフトパルプ排水の処理装置について図１を参照して説明する。 A kraft pulp wastewater treatment apparatus suitable for carrying out the method of the present invention will be described below with reference to FIG.
クラフトパルプ排水は原水槽１に導入され、ポンプ（図示略）を有したライン２によりｐＨ調整槽３に導入される。このｐＨ調整槽３に必要に応じ酸又はアルカリが添加され、ｐＨ５〜８に調整される。この原水槽１、ライン２及びｐＨ調整槽３のいずれかに対し希釈水がポンプ及び流量調節弁（図示略）よりなる添加手段によって添加可能とされている。
The kraft pulp wastewater is introduced into the raw water tank 1 and is introduced into the pH adjusting tank 3 through a
ｐＨ調整槽３内の液は、ポンプ４によって嫌気処理槽５の底部に導入され、上向流にて通水される。この実施の形態では、嫌気処理槽５内に非生物流動性担体の流動床５Ａが形成されており、嫌気処理が行われる。担体流動床５Ａを通り抜けた処理水（上澄水）の一部は、スクリーン５ａ及び返送ライン６を介してｐＨ調整槽３に返送され、残部はスクリーン５ｂを介して取り出される。槽５内で発生したメタンガスは槽頂のガス取出ライン５ｃより取り出される。なお、この嫌気処理水の少なくとも一部を好気処理し、この好気処理水の少なくとも一部を希釈水として用いてもよい。
The liquid in the pH adjustment tank 3 is introduced into the bottom of the anaerobic treatment tank 5 by the pump 4 and passed through in an upward flow. In this embodiment, a
以下に実施例および比較例を挙げて本発明をより具体的に説明する。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
［実施例１］
図１に示す装置において、クラフトパルプ排水を希釈してＴＯＣ１７０〜５００ｍｇ／Ｌ、ＣＯＤＣｒ８００〜１９００ｍｇ／Ｌ、ＢＯＤ３００〜７００ｍｇ／Ｌ、メタノール４５０〜１１００ｍｇ／Ｌ、ＳＯ４３０〜８０ｍｇ／Ｌとしたものを原水とし、この原水を以下の条件にて処理した。
[Example 1]
In the apparatus shown in FIG. 1, kraft pulp waste water is diluted to TOC 170-500 mg / L, COD Cr 800-1900 mg / L, BOD 300-700 mg / L, methanol 450-1100 mg / L, SO 4 30-80 mg / L. The raw water was treated under the following conditions.
ｐＨ調整槽：容量約３Ｌ
嫌気処理槽：直径１５ｃｍ、高さ６０ｃｍ、容量約１０Ｌ
pH adjustment tank: Capacity of about 3L
Anaerobic treatment tank: diameter 15cm, height 60cm, capacity about 10L
通水条件は、通水量８０Ｌ／ｄ、嫌気処理槽ＨＲＴ３．５時間、ｐＨ調整槽３のｐＨ７．５とした。嫌気処理槽の担体としては、平均粒径２．５ｍｍのポリオレフィン系樹脂担体を用い、担体の充填量は槽内保有水量（体積）の４０％とした。また、種汚泥として嫌気処理槽に分散状の嫌気汚泥（３００００ｍｇＶＳＳ／Ｌ）を２Ｌ投入した。嫌気処理槽流入水のＴＯＣ濃度をＴＯＣ計で測定し、このＴＯＣ濃度が１７０〜２００ｍｇ／Ｌとなるように希釈水として水道水をライン２に添加した。
The water flow conditions were a water flow rate of 80 L / d, an anaerobic treatment tank HRT of 3.5 hours, and a pH of the pH adjustment tank 3 of 7.5. As the carrier for the anaerobic treatment tank, a polyolefin resin carrier having an average particle diameter of 2.5 mm was used, and the filling amount of the carrier was 40% of the amount of water retained in the tank (volume). Also, 2 L of dispersed anaerobic sludge (30000 mg VSS / L) was added to the anaerobic treatment tank as seed sludge. The TOC concentration of the anaerobic treatment tank inflow water was measured with a TOC meter, and tap water was added to the
嫌気処理水のｐＨ調整槽３への返送量は、嫌気処理水の５０％とした。 The return amount of the anaerobic treated water to the pH adjustment tank 3 was 50%.
原水、嫌気処理槽の流入水及び嫌気処理水のＴＯＣ濃度の経時変化を図２に示す。 FIG. 2 shows temporal changes in the TOC concentration of the raw water, the inflow water of the anaerobic treatment tank, and the anaerobic treatment water.
［実施例２］
嫌気処理槽流入水のＴＯＣ濃度が２５０〜３００ｍｇ／Ｌとなるように希釈水添加を制御したこと以外は実施例１と同様にして希釈したクラフトパルプ排水を処理した。原水、嫌気処理槽の流入水及び嫌気処理水のＴＯＣ濃度の経時変化を図３に示す。
[Example 2]
The diluted kraft pulp waste water was treated in the same manner as in Example 1 except that the addition of dilution water was controlled so that the TOC concentration of the anaerobic treatment tank influent water was 250 to 300 mg / L. FIG. 3 shows changes over time in the TOC concentration of the raw water, the inflow water of the anaerobic treatment tank, and the anaerobic treatment water.
［比較例１］
嫌気処理槽への通水開始後、２３日目以降に嫌気処理槽流入水のＴＯＣ濃度が３００〜５００ｍｇ／Ｌとなるように希釈水添加を制御したこと以外は実施例１と同様にして希釈したクラフトパルプ排水を処理した。原水、嫌気処理槽の流入水及び嫌気処理水のＴＯＣ濃度の経時変化を図４に示す。
[Comparative Example 1]
Dilution was performed in the same manner as in Example 1 except that the addition of dilution water was controlled so that the TOC concentration of the anaerobic treatment tank inflow water became 300 to 500 mg / L after 23 days after the start of water flow to the anaerobic treatment tank. Treated kraft pulp wastewater. FIG. 4 shows temporal changes in the TOC concentration of the raw water, the inflow water of the anaerobic treatment tank, and the anaerobic treatment water.
＜考察＞
図２，３の通り、嫌気処理槽流入水のＴＯＣ濃度を３００ｍｇ／Ｌ以下とした実施例１，２の場合には嫌気処理水のＴＯＣ濃度が低くなり、ＴＯＣ除去率が高くなる。特に実施例１のように嫌気処理槽流入水のＴＯＣ濃度を約２００ｍｇ／Ｌとすることにより、嫌気処理水のＴＯＣ濃度が５０ｍｇ／Ｌ以下となり、ＴＯＣ除去率が８５％以上ときわめて効率よくクラフトパルプ排水を処理することができる。実施例２でも、ＴＯＣ除去率は６０％以上である。これに対し、比較例１では、ＴＯＣ濃度が３００ｍｇ／Ｌを超えた２３日目以降に、嫌気処理水のＴＯＣ濃度が著しく上昇し、ＴＯＣ除去率が平均して６０％以下に低下することが認められた。
<Discussion>
As shown in FIGS. 2 and 3, in the case of Examples 1 and 2 in which the TOC concentration of the anaerobic treatment tank inflow water is 300 mg / L or less, the TOC concentration of the anaerobic treatment water becomes low and the TOC removal rate becomes high. In particular, by setting the TOC concentration of the anaerobic treatment tank inflow water to about 200 mg / L as in Example 1, the TOC concentration of the anaerobic treatment water is 50 mg / L or less, and the TOC removal rate is 85% or more. Pulp wastewater can be treated. Also in Example 2, the TOC removal rate is 60% or more. On the other hand, in Comparative Example 1, the TOC concentration of the anaerobic treated water significantly increases after the 23rd day when the TOC concentration exceeds 300 mg / L, and the TOC removal rate decreases to 60% or less on average. Admitted.
なお、実施例１，２では運転期間中に担体の浮上は確認されなかったが、比較例１では嫌気処理槽流入水のＴＯＣ濃度３００ｍｇ／Ｌの場合、担体が少しずつ浮上し、４００ｍｇ／Ｌになるとすべての担体が浮上し、安定運転が困難になった。 In Examples 1 and 2, the carrier floating was not confirmed during the operation period. In Comparative Example 1, the carrier floated little by little when the TOC concentration of the anaerobic treatment tank inflow water was 300 mg / L, and 400 mg / L. Then, all the carriers surfaced and stable operation became difficult.
以上の実施例及び比較例より、本発明によれば、クラフトパルプ排水を嫌気処理する方法において、嫌気処理工程に流入する排水のＴＯＣ濃度を１００〜３００ｍｇ／Ｌに制御することにより、クラフトパルプ排水が安定して処理されることが確認された。 From the above Examples and Comparative Examples, according to the present invention, in the method for anaerobically treating kraft pulp wastewater, the TOC concentration of wastewater flowing into the anaerobic treatment step is controlled to 100 to 300 mg / L, thereby making the kraft pulp wastewater. Was confirmed to be treated stably.
１ 原水槽
３ ｐＨ調整槽
５ 嫌気処理槽
1 Raw water tank 3 pH adjustment tank 5 Anaerobic treatment tank
Claims (5)
該嫌気処理槽に供給する被処理水のＴＯＣ濃度を１００〜３００ｍｇ／Ｌに制御することを特徴とするクラフトパルプ排水の処理方法。 In the method of treating kraft pulp wastewater, which supplies an anaerobic treatment tank containing kraft pulp wastewater to an anaerobic treatment tank filled with a non-biological fluid carrier,
A method for treating kraft pulp wastewater, wherein the TOC concentration of water to be treated supplied to the anaerobic treatment tank is controlled to 100 to 300 mg / L.
前記嫌気処理槽に供給される被処理水のＴＯＣを計測する計測手段と、
該計測手段で計測されたＴＯＣ濃度が１００〜３００ｍｇ／Ｌとなるように前記被処理水に希釈水を添加する希釈水添加手段と
を備えたことを特徴とするクラフトパルプ排水の処理装置。 In the kraft pulp wastewater treatment equipment that supplies anaerobic treatment water containing kraft pulp wastewater to an anaerobic treatment tank filled with a non-biological fluid carrier,
Measuring means for measuring the TOC of the water to be treated supplied to the anaerobic treatment tank;
An apparatus for treating kraft pulp wastewater, comprising dilution water adding means for adding dilution water to the water to be treated so that the TOC concentration measured by the measurement means is 100 to 300 mg / L.
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| JP2018164891A (en) * | 2017-03-28 | 2018-10-25 | 住友重機械エンバイロメント株式会社 | Water treatment apparatus |
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