WO2023089927A1 - Waste water treatment method and device - Google Patents
Waste water treatment method and device Download PDFInfo
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- WO2023089927A1 WO2023089927A1 PCT/JP2022/034057 JP2022034057W WO2023089927A1 WO 2023089927 A1 WO2023089927 A1 WO 2023089927A1 JP 2022034057 W JP2022034057 W JP 2022034057W WO 2023089927 A1 WO2023089927 A1 WO 2023089927A1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
- C02F1/64—Heavy metal compounds of iron or manganese
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- the present invention relates to a wastewater treatment method and apparatus for flocculating and solid-liquid separation treatment of wastewater, and in particular, part of the flocculated sludge is returned to the reaction tank, and an alkaline agent such as slaked lime is added to the returned sludge.
- the present invention relates to a method and apparatus for treating wastewater.
- High-density sludge such as the alkaline sludge method is a method of obtaining high-concentration sludge with excellent dehydration properties by flocculating and solid-liquid separation treatment of wastewater such as fluorine-containing wastewater, phosphorus-containing wastewater, and heavy metal-containing wastewater.
- method (HDS method: High Density Sludge) is known.
- an alkali such as slaked lime (Ca(OH) 2 ) is added to part of the sludge that is separated and returned in the solid-liquid separation treatment in the latter stage of the flocculation treatment.
- Fig. 2 is a system diagram showing a typical apparatus for conventional high-density flocculated sludge treatment methods.
- Raw water such as fluorine-containing waste water, phosphorus-containing waste water, and heavy metal-containing waste water is added with a pH adjuster in the raw water tank 1 to adjust the pH to about 2.5 to 3.0, and then introduced into the reaction tank 2 to be described later. It is mixed with the reformed sludge introduced from the reforming tank 8 and reacts.
- This reaction liquid is then fed to the flocculating tank 3 , where a polymer flocculant is added by the polymer flocculant addition means 3 a to flocculate, and then solid-liquid separated in the sedimentation tank 4 .
- the supernatant water in the sedimentation tank 4 is discharged out of the system as treated water.
- a part of the separated sludge withdrawn from the sedimentation tank 4 by the pump 5 is returned to the reforming tank 8 through the sludge return line 7, and the remainder is discharged out of the system through the discharge line 6.
- a slaked lime solution/dispersion liquid (liquid in which slaked lime is partly dissolved and the rest is dispersed) supplied from a slaked lime addition device 9 as an alkali agent addition means is mixed with the returned sludge. be.
- This mixed liquid (modified sludge) is supplied to the reaction tank 2 .
- the reaction in this reaction tank 2 is preferably carried out in a predetermined pH range (for example, 6 to 11, particularly 6 to 8). The amount of slaked lime supplied to the reforming tank 8 is adjusted based on the pH.
- the sludge discharge line 6 and the sludge return line 7 are provided with valves 11 and 12, respectively.
- control means not shown
- the reaction in the reaction tank 2 is preferably carried out in a predetermined pH range (for example, 6 to 11, particularly 6 to 8), and the pH of the reaction tank 2 is within the appropriate range. It is important that the reformed sludge is introduced from the reforming tank 8 so that For that purpose, it is desirable that the pH in the reforming tank 8 changes rapidly following the control of the addition of slaked lime to the reforming tank 8 . Moreover, the sludge retention time in the reforming tank 8 is desirably set so that the added slaked lime is sufficiently dissolved in water and reacts with the sludge.
- the sludge retention in the reforming tank 8 is set to about 10 minutes, but the retention time is too long, so the pH control of the reforming tank 8 is not quick enough, There is a risk that the reaction in the reaction tank 2 will become insufficient, the treated water quality will deteriorate, or the water content of the sludge discharged from the discharge line 6 will increase. In addition, the sludge retention time in the reforming tank 8 was too long, and there was a risk of sludge clogging.
- the present invention can rapidly control the pH of alkaline agent-added return sludge flowing into a reaction tank from a reforming tank, and can always improve the quality of treated water and the properties of discharged sludge.
- An object of the present invention is to provide a method and apparatus for treating waste water that prevents clogging.
- the gist of the wastewater treatment method and apparatus of the present invention is as follows.
- a reaction tank for adding alkaline agent-added returned sludge from the reforming tank to waste water
- a flocculation tank for adding a polymer flocculant to the liquid from the reaction tank
- solid-liquid separation means for solid-liquid separation of the aggregating treatment liquid to which the aggregating agent has been added
- a wastewater treatment apparatus comprising a reforming tank, wherein an alkaline agent is added to a portion of the sludge separated by the solid-liquid separation means to produce the alkaline agent-added return sludge,
- a wastewater treatment apparatus wherein the volume of the reforming tank is set so that the sludge retention time in the reforming tank is 1 to 5 minutes.
- the reforming tank is provided with a sludge outlet at the upper part of the side wall surface of the tank,
- the pH control in the reforming tank is quickly performed, so that the pH of the reaction tank is always in an appropriate range, the quality of the treated water is improved, and the sludge water content is reduced. be low. In addition, clogging of the reforming tank with sludge is prevented.
- FIG. 1 is a vertical cross-sectional view of a reforming tank used in a waste water treatment method and apparatus according to an embodiment
- FIG. FIG. 2 is a flowchart for explaining a conventional wastewater treatment method and apparatus.
- the overall configuration of the wastewater treatment flow is the same as in FIG. That is, as in FIG. 2, the raw water is added with a pH adjuster in the raw water tank 1 to adjust the pH to about 2.5 to 3.0, and then introduced into the reaction tank 2 and introduced from the reforming tank 8. It is mixed with reformed sludge and reacts with it.
- This reaction liquid is then fed to the flocculating tank 3 , where a polymer flocculant is added by the polymer flocculant addition means 3 a to flocculate, and then solid-liquid separated in the sedimentation tank 4 .
- the supernatant water in the sedimentation tank 4 is discharged out of the system as treated water.
- a part of the separated sludge withdrawn from the sedimentation tank 4 by the pump 5 is returned to the reforming tank 8 through the sludge return line 7, and the remainder is discharged out of the system through the discharge line 6.
- the slaked lime solution/dispersion supplied from the slaked lime addition device 9 as the alkaline agent addition means is mixed with the returned sludge.
- This mixed liquid (modified sludge) is supplied to the reaction tank 2 .
- the slaked lime addition device 9 has a tank for storing the dissolved/dispersed solution of slaked lime and a chemical feeding pump for feeding the liquid in the tank to the reforming tank 8 .
- the chemical injection amount by the chemical injection pump is controlled by inverter control or the like.
- the reaction in the reaction tank 2 is preferably carried out in a predetermined pH range (eg 6-11, especially 6-8).
- the amount of slaked lime supplied to the reforming tank 8 by the slaked lime addition means 9 based on the pH detected by the pH meter 2a provided in the reaction tank 2 is controlled so as to achieve such a pH range. regulated by
- FIG. 1 is a longitudinal sectional view of the reforming tank 8 used in this embodiment.
- the reforming tank 8 is equipped with an agitator 20 .
- An outflow port 21 is provided in the upper portion of the side wall of the reforming tank 8 .
- a baffle 22 made of a vertical plate is provided so as to face the outflow port 21 .
- a sludge outflow pipe 23 is connected to the outflow port 21 . This sludge outflow pipe 23 extends vertically downward.
- the reforming tank 8 is arranged above the reaction tank 2 , and the reformed sludge from the sludge outflow pipe 23 falls vertically downward and is introduced into the reaction tank 2 .
- the volume of the reforming tank 8 is set so that the average retention time of the returned sludge is 1 to 5 minutes, preferably 2 to 4 minutes, and particularly preferably about 3 minutes.
- the reforming tank 8 has a relatively small volume so that the return sludge retention time is 1 to 5 minutes.
- the pH in the reforming tank 8 changes rapidly, so the pH of the reformed sludge supplied from the reforming tank 8 to the reaction tank 2 also changes. change quickly.
- the pH in the reaction tank 2 is always kept within a predetermined range (preferably 6 to 11, particularly preferably 6 to 8), the aggregation reaction is sufficiently performed, the quality of the treated water is improved, and the discharge line 6
- the moisture content of the flocculated sludge discharged from is low.
- the retention time of sludge in the reforming tank 8 is relatively short, sludge clogging trouble in the reforming tank 8 is prevented.
- the volume of the reforming tank 8 is small, the total height of the reaction tank 2 and the reforming tank 8 arranged above the reaction tank 2 can be reduced, and the apparatus can be made compact. . Therefore, when newly installing a reforming tank or remodeling an existing apparatus, layout design of the reforming tank is facilitated.
- raw water to be treated in the present invention examples include, but are not limited to, fluorine-containing wastewater, phosphorus-containing wastewater, and heavy metal-containing wastewater such as iron, zinc, copper, chromium, nickel, lead, and aluminum.
- slaked lime is added as an alkali agent to the reforming tank 8, but it is not limited to this, and caustic soda or the like may be used in the case of wastewater containing heavy metals.
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Abstract
In this invention, raw water is introduced into a reaction tank 2 to be mixed with slaked lime added return sludge from a reforming tank 8, and then in a flocculation tank 3, flocculation treatment is carried out by addition of polymer flocculant. A flocculation treatment liquid is introduced into a sedimentation tank 4 and the sludge is separated. A part of the sludge is introduced into the reforming tank 8 by a sludge return line 7. A sludge retention time in the reforming tank 8 is set to 1 to 5 minutes. The reforming tank 8 is disposed above the reaction tank 2, and a sludge outflow pipe 23 connected to a sludge outlet 21 of the reforming tank 8 is extended vertically downward.
Description
本発明は、排水を凝集及び固液分離処理する排水の処理方法及び装置に係り、特に凝集汚泥の一部を反応槽に返送すると共に、この返送汚泥に消石灰等のアルカリ剤を添加するようにした排水の処理方法及び装置に関する。
The present invention relates to a wastewater treatment method and apparatus for flocculating and solid-liquid separation treatment of wastewater, and in particular, part of the flocculated sludge is returned to the reaction tank, and an alkaline agent such as slaked lime is added to the returned sludge. The present invention relates to a method and apparatus for treating wastewater.
フッ素含有排水、リン含有排水、重金属含有排水などの排水を凝集及び固液分離処理して、濃縮性に富み、脱水性に優れた高濃度汚泥を得る方法として、アルカリ汚泥法等の高密度汚泥法（ＨＤＳ法：Ｈｉｇｈ Ｄｅｎｓｉｔｙ Ｓｌｕｄｇｅ）が知られている。アルカリ汚泥法では、凝集処理の後段の固液分離処理で分離されて返送される汚泥の一部に消石灰（Ｃａ（ＯＨ）２）等のアルカリを添加する。
High-density sludge such as the alkaline sludge method is a method of obtaining high-concentration sludge with excellent dehydration properties by flocculating and solid-liquid separation treatment of wastewater such as fluorine-containing wastewater, phosphorus-containing wastewater, and heavy metal-containing wastewater. method (HDS method: High Density Sludge) is known. In the alkaline sludge method, an alkali such as slaked lime (Ca(OH) 2 ) is added to part of the sludge that is separated and returned in the solid-liquid separation treatment in the latter stage of the flocculation treatment.
図２は、従来の高密度凝集汚泥処理法の代表的な装置を示す系統図である。フッ素含有排水、リン含有排水、重金属含有排水などの原水は原水槽１にてｐＨ調整剤が添加されてｐＨ２．５～３．０程度に調整された後、反応槽２に導入され、後述の改質槽８から導入される改質汚泥と混合され、反応する。この反応液は、次いで凝集槽３に送給され、高分子凝集剤添加手段３ａにより高分子凝集剤が添加されて凝集処理された後、沈殿槽４で固液分離される。沈殿槽４の上澄水は処理水として系外へ排出される。沈殿槽４からポンプ５により引き抜かれた分離汚泥の一部は汚泥返送ライン７により改質槽８に返送され、残部は排出ライン６により系外へ排出される。
Fig. 2 is a system diagram showing a typical apparatus for conventional high-density flocculated sludge treatment methods. Raw water such as fluorine-containing waste water, phosphorus-containing waste water, and heavy metal-containing waste water is added with a pH adjuster in the raw water tank 1 to adjust the pH to about 2.5 to 3.0, and then introduced into the reaction tank 2 to be described later. It is mixed with the reformed sludge introduced from the reforming tank 8 and reacts. This reaction liquid is then fed to the flocculating tank 3 , where a polymer flocculant is added by the polymer flocculant addition means 3 a to flocculate, and then solid-liquid separated in the sedimentation tank 4 . The supernatant water in the sedimentation tank 4 is discharged out of the system as treated water. A part of the separated sludge withdrawn from the sedimentation tank 4 by the pump 5 is returned to the reforming tank 8 through the sludge return line 7, and the remainder is discharged out of the system through the discharge line 6.
改質槽８では、アルカリ剤添加手段としての消石灰添加装置９により供給される消石灰の溶解／分散液（消石灰の一部は溶解し、残部は分散している液）と返送汚泥とが混合される。この混合液（改質汚泥）は反応槽２に供給される。この反応槽２における反応は所定のｐＨ範囲（例えば６～１１、特に６～８）で行うのが好ましく、このようなｐＨ範囲となるように、反応槽２に設けられたｐＨ計２ａの検出ｐＨに基づいて改質槽８に供給される消石灰の量が調節される。
In the reforming tank 8, a slaked lime solution/dispersion liquid (liquid in which slaked lime is partly dissolved and the rest is dispersed) supplied from a slaked lime addition device 9 as an alkali agent addition means is mixed with the returned sludge. be. This mixed liquid (modified sludge) is supplied to the reaction tank 2 . The reaction in this reaction tank 2 is preferably carried out in a predetermined pH range (for example, 6 to 11, particularly 6 to 8). The amount of slaked lime supplied to the reforming tank 8 is adjusted based on the pH.
汚泥排出ライン６及び汚泥返送ライン７にはそれぞれバルブ１１，１２が設けられている。バルブ１１，１２を制御手段（図示略）によって制御することにより、改質槽８への汚泥返送量が制御される。
The sludge discharge line 6 and the sludge return line 7 are provided with valves 11 and 12, respectively. By controlling the valves 11 and 12 with control means (not shown), the amount of sludge returned to the reforming tank 8 is controlled.
上記排水の処理方法及び装置においては、前述のとおり、反応槽２における反応は所定のｐＨ範囲（例えば６～１１、特に６～８）で行うのが好ましく、反応槽２のｐＨがかかる適正範囲となるように改質槽８から改質汚泥が導入されることが重要である。そのためには、改質槽８への消石灰の添加制御に追随して改質槽８内のｐＨが迅速に変化することが望ましい。また、改質槽８内の汚泥滞留時間は、添加された消石灰が十分に水に溶解し、汚泥と反応するように滞留時間が設定されていることが望ましい。
In the wastewater treatment method and apparatus described above, as described above, the reaction in the reaction tank 2 is preferably carried out in a predetermined pH range (for example, 6 to 11, particularly 6 to 8), and the pH of the reaction tank 2 is within the appropriate range. It is important that the reformed sludge is introduced from the reforming tank 8 so that For that purpose, it is desirable that the pH in the reforming tank 8 changes rapidly following the control of the addition of slaked lime to the reforming tank 8 . Moreover, the sludge retention time in the reforming tank 8 is desirably set so that the added slaked lime is sufficiently dissolved in water and reacts with the sludge.
従来の排水の処理方法及び装置では、改質槽８の汚泥滞留が約１０分に設定されているが、滞留時間が長すぎるために、改質槽８のｐＨ制御に迅速性が不足し、反応槽２の反応が不十分となり、処理水質が悪化したり、排出ライン６からの排出汚泥の含水率が高くなったりするおそれがあった。また、改質槽８内の汚泥滞留時間が長すぎ、汚泥閉塞のおそれがあった。
In the conventional wastewater treatment method and apparatus, the sludge retention in the reforming tank 8 is set to about 10 minutes, but the retention time is too long, so the pH control of the reforming tank 8 is not quick enough, There is a risk that the reaction in the reaction tank 2 will become insufficient, the treated water quality will deteriorate, or the water content of the sludge discharged from the discharge line 6 will increase. In addition, the sludge retention time in the reforming tank 8 was too long, and there was a risk of sludge clogging.
本発明は、改質槽から反応槽に流入するアルカリ剤添加返送汚泥のｐＨを迅速に制御することができ、処理水質や排出汚泥性状を常に良好にすることができ、また改質槽の汚泥閉塞が防止される排水の処理方法及び装置を提供することを課題とする。
INDUSTRIAL APPLICABILITY The present invention can rapidly control the pH of alkaline agent-added return sludge flowing into a reaction tank from a reforming tank, and can always improve the quality of treated water and the properties of discharged sludge. An object of the present invention is to provide a method and apparatus for treating waste water that prevents clogging.
上記課題を解決するために、本発明の排水の処理方法及び装置は次を要旨とする。
In order to solve the above problems, the gist of the wastewater treatment method and apparatus of the present invention is as follows.
［１］ 反応槽にて排水にアルカリ剤添加返送汚泥を添加して反応させ、次いで凝集処理した後、固液分離処理して汚泥を処理水から分離し、
分離した汚泥の一部を返送汚泥とし、この返送汚泥を改質槽に導入して前記アルカリ剤を添加して前記排水に添加し、
汚泥の残部を引き抜き汚泥として排出し、
前記反応槽内のｐＨが所定範囲となるように改質槽へのアルカリ添加量を制御する排水の処理方法において、
前記改質槽の汚泥の滞留時間を１～５分とすることを特徴とする排水の処理方法。 [1] Add alkaline agent-added returned sludge to waste water in a reaction tank to react it, then coagulate it, and then separate the sludge from the treated water by solid-liquid separation treatment,
A part of the separated sludge is used as return sludge, and the return sludge is introduced into a reforming tank, and the alkali agent is added to the waste water,
The rest of the sludge is extracted and discharged as sludge,
In the wastewater treatment method for controlling the amount of alkali added to the reforming tank so that the pH in the reaction tank is within a predetermined range,
A method for treating wastewater, characterized in that the retention time of the sludge in the reforming tank is 1 to 5 minutes.
分離した汚泥の一部を返送汚泥とし、この返送汚泥を改質槽に導入して前記アルカリ剤を添加して前記排水に添加し、
汚泥の残部を引き抜き汚泥として排出し、
前記反応槽内のｐＨが所定範囲となるように改質槽へのアルカリ添加量を制御する排水の処理方法において、
前記改質槽の汚泥の滞留時間を１～５分とすることを特徴とする排水の処理方法。 [1] Add alkaline agent-added returned sludge to waste water in a reaction tank to react it, then coagulate it, and then separate the sludge from the treated water by solid-liquid separation treatment,
A part of the separated sludge is used as return sludge, and the return sludge is introduced into a reforming tank, and the alkali agent is added to the waste water,
The rest of the sludge is extracted and discharged as sludge,
In the wastewater treatment method for controlling the amount of alkali added to the reforming tank so that the pH in the reaction tank is within a predetermined range,
A method for treating wastewater, characterized in that the retention time of the sludge in the reforming tank is 1 to 5 minutes.
［２］ 前記アルカリ剤は消石灰である、［１］の排水の処理方法。
[2] The wastewater treatment method of [1], wherein the alkaline agent is slaked lime.
［３］ 排水に改質槽からのアルカリ剤添加返送汚泥を添加する反応槽と、
該反応槽からの液に高分子凝集剤を添加する凝集槽と、
該凝集剤が添加された凝集処理液を固液分離する固液分離手段と、
該固液分離手段で分離された汚泥の一部にアルカリ剤を添加して前記アルカリ剤添加返送汚泥とする改質槽と
を備えてなる排水の処理装置において、
該改質槽の汚泥滞留時間が１～５分となるように該改質槽の容積が設定されていることを特徴とする排水の処理装置。 [3] a reaction tank for adding alkaline agent-added returned sludge from the reforming tank to waste water;
a flocculation tank for adding a polymer flocculant to the liquid from the reaction tank;
solid-liquid separation means for solid-liquid separation of the aggregating treatment liquid to which the aggregating agent has been added;
A wastewater treatment apparatus comprising a reforming tank, wherein an alkaline agent is added to a portion of the sludge separated by the solid-liquid separation means to produce the alkaline agent-added return sludge,
A wastewater treatment apparatus, wherein the volume of the reforming tank is set so that the sludge retention time in the reforming tank is 1 to 5 minutes.
該反応槽からの液に高分子凝集剤を添加する凝集槽と、
該凝集剤が添加された凝集処理液を固液分離する固液分離手段と、
該固液分離手段で分離された汚泥の一部にアルカリ剤を添加して前記アルカリ剤添加返送汚泥とする改質槽と
を備えてなる排水の処理装置において、
該改質槽の汚泥滞留時間が１～５分となるように該改質槽の容積が設定されていることを特徴とする排水の処理装置。 [3] a reaction tank for adding alkaline agent-added returned sludge from the reforming tank to waste water;
a flocculation tank for adding a polymer flocculant to the liquid from the reaction tank;
solid-liquid separation means for solid-liquid separation of the aggregating treatment liquid to which the aggregating agent has been added;
A wastewater treatment apparatus comprising a reforming tank, wherein an alkaline agent is added to a portion of the sludge separated by the solid-liquid separation means to produce the alkaline agent-added return sludge,
A wastewater treatment apparatus, wherein the volume of the reforming tank is set so that the sludge retention time in the reforming tank is 1 to 5 minutes.
［４］ 前記改質槽は前記反応槽の上方に配置されている、［３］の排水の処理装置。
[4] The wastewater treatment apparatus of [3], wherein the reforming tank is arranged above the reaction tank.
［５］ 前記改質槽は、槽側壁面の上部に汚泥流出口が設けられており、
該汚泥流出口に連なる汚泥流出配管が鉛直下方に延在しており、該汚泥流出配管からの汚泥が前記反応槽に導入される、［４］の排水処理装置。 [5] The reforming tank is provided with a sludge outlet at the upper part of the side wall surface of the tank,
The wastewater treatment apparatus according to [4], wherein a sludge outflow pipe connected to the sludge outflow port extends vertically downward, and sludge from the sludge outflow pipe is introduced into the reaction tank.
該汚泥流出口に連なる汚泥流出配管が鉛直下方に延在しており、該汚泥流出配管からの汚泥が前記反応槽に導入される、［４］の排水処理装置。 [5] The reforming tank is provided with a sludge outlet at the upper part of the side wall surface of the tank,
The wastewater treatment apparatus according to [4], wherein a sludge outflow pipe connected to the sludge outflow port extends vertically downward, and sludge from the sludge outflow pipe is introduced into the reaction tank.
本発明の排水の処理方法及び装置によると、改質槽におけるｐＨ制御が迅速に行われるようになるので、反応槽のｐＨが常に適正範囲となり、処理水質が良好になると共に、汚泥含水率も低いものとなる。また、改質槽の汚泥閉塞が防止される。
According to the wastewater treatment method and apparatus of the present invention, the pH control in the reforming tank is quickly performed, so that the pH of the reaction tank is always in an appropriate range, the quality of the treated water is improved, and the sludge water content is reduced. be low. In addition, clogging of the reforming tank with sludge is prevented.
以下、図面を参照して実施の形態について説明する。
Embodiments will be described below with reference to the drawings.
この実施の形態においても、排水処理のフローの全体構成は図２と同一である。即ち、図２と同様に、原水は原水槽１にてｐＨ調整剤が添加されてｐＨ２．５～３．０程度に調整された後、反応槽２に導入され、改質槽８から導入される改質汚泥と混合され、反応する。この反応液は、次いで凝集槽３に送給され、高分子凝集剤添加手段３ａにより高分子凝集剤が添加されて凝集処理された後、沈殿槽４で固液分離される。沈殿槽４の上澄水は処理水として系外へ排出される。沈殿槽４からポンプ５により引き抜かれた分離汚泥の一部は汚泥返送ライン７により改質槽８に返送され、残部は排出ライン６により系外へ排出される。
Also in this embodiment, the overall configuration of the wastewater treatment flow is the same as in FIG. That is, as in FIG. 2, the raw water is added with a pH adjuster in the raw water tank 1 to adjust the pH to about 2.5 to 3.0, and then introduced into the reaction tank 2 and introduced from the reforming tank 8. It is mixed with reformed sludge and reacts with it. This reaction liquid is then fed to the flocculating tank 3 , where a polymer flocculant is added by the polymer flocculant addition means 3 a to flocculate, and then solid-liquid separated in the sedimentation tank 4 . The supernatant water in the sedimentation tank 4 is discharged out of the system as treated water. A part of the separated sludge withdrawn from the sedimentation tank 4 by the pump 5 is returned to the reforming tank 8 through the sludge return line 7, and the remainder is discharged out of the system through the discharge line 6.
改質槽８では、アルカリ剤添加手段としての消石灰添加装置９により供給される消石灰の溶解／分散液と返送汚泥とが混合される。この混合液（改質汚泥）は反応槽２に供給される。消石灰添加装置９は、消石灰の溶解／分散液を貯留するタンクと、該タンク内の液を改質槽８へ送液する薬注ポンプ等を有する。薬注ポンプによる薬注量はインバータ制御等により制御される。この反応槽２における反応は所定のｐＨ範囲（例えば６～１１、特に６～８）で行うのが好ましい。このようなｐＨ範囲となるように、反応槽２に設けられたｐＨ計２ａの検出ｐＨに基づいて消石灰添加手段９によって改質槽８に供給される消石灰の量が添加装置９の薬注ポンプにより調節される。
In the reforming tank 8, the slaked lime solution/dispersion supplied from the slaked lime addition device 9 as the alkaline agent addition means is mixed with the returned sludge. This mixed liquid (modified sludge) is supplied to the reaction tank 2 . The slaked lime addition device 9 has a tank for storing the dissolved/dispersed solution of slaked lime and a chemical feeding pump for feeding the liquid in the tank to the reforming tank 8 . The chemical injection amount by the chemical injection pump is controlled by inverter control or the like. The reaction in the reaction tank 2 is preferably carried out in a predetermined pH range (eg 6-11, especially 6-8). The amount of slaked lime supplied to the reforming tank 8 by the slaked lime addition means 9 based on the pH detected by the pH meter 2a provided in the reaction tank 2 is controlled so as to achieve such a pH range. regulated by
図１は、この実施の形態で用いられている改質槽８の縦断面図である。改質槽８は、撹拌機２０を備えている。改質槽８の槽側壁の上部に流出口２１が設けられている。流出口２１に対峙するように、縦方向の板よりなるバッフル２２が設けられている。流出口２１に汚泥流出配管２３が接続されている。この汚泥流出配管２３は鉛直下方に向かって延在している。
FIG. 1 is a longitudinal sectional view of the reforming tank 8 used in this embodiment. The reforming tank 8 is equipped with an agitator 20 . An outflow port 21 is provided in the upper portion of the side wall of the reforming tank 8 . A baffle 22 made of a vertical plate is provided so as to face the outflow port 21 . A sludge outflow pipe 23 is connected to the outflow port 21 . This sludge outflow pipe 23 extends vertically downward.
改質槽８は、反応槽２の上方に配置されており、汚泥流出配管２３からの改質汚泥は鉛直下方に落下して反応槽２に導入される。この改質槽８は、返送汚泥の平均的な滞留時間が１～５分、好ましくは２～４分、特に好ましくは約３分となるように槽容積が設定されている。
The reforming tank 8 is arranged above the reaction tank 2 , and the reformed sludge from the sludge outflow pipe 23 falls vertically downward and is introduced into the reaction tank 2 . The volume of the reforming tank 8 is set so that the average retention time of the returned sludge is 1 to 5 minutes, preferably 2 to 4 minutes, and particularly preferably about 3 minutes.
このように改質槽８は、返送汚泥滞留時間が１～５分となるように比較的小容積とされている。この結果、消石灰添加手段９からの消石灰添加量を変化させたときに改質槽８内のｐＨが迅速に変化するので、改質槽８から反応槽２に供給される改質汚泥のｐＨも迅速に変化する。このため、反応槽２内のｐＨが常に所定範囲（好ましくは６～１１、特に好ましくは６～８）に保たれ、凝集反応が十分に行われ、処理水質が良好になると共に、排出ライン６から排出される凝集汚泥の水分含有率が低いものとなる。
Thus, the reforming tank 8 has a relatively small volume so that the return sludge retention time is 1 to 5 minutes. As a result, when the amount of slaked lime added from the slaked lime adding means 9 is changed, the pH in the reforming tank 8 changes rapidly, so the pH of the reformed sludge supplied from the reforming tank 8 to the reaction tank 2 also changes. change quickly. For this reason, the pH in the reaction tank 2 is always kept within a predetermined range (preferably 6 to 11, particularly preferably 6 to 8), the aggregation reaction is sufficiently performed, the quality of the treated water is improved, and the discharge line 6 The moisture content of the flocculated sludge discharged from is low.
また、改質槽８における汚泥の滞留時間が比較的短いので、改質槽８における汚泥閉塞トラブルが防止される。また、改質槽８の容積が小さいので、反応槽２と、該反応槽２の上方に配置された改質槽８とを合わせた全体の高さが小さくなり、装置がコンパクトなものとなる。そのため、改質槽を新設したり、既存の装置を改造したりする場合に改質槽の配置設計が容易となる。
In addition, since the retention time of sludge in the reforming tank 8 is relatively short, sludge clogging trouble in the reforming tank 8 is prevented. In addition, since the volume of the reforming tank 8 is small, the total height of the reaction tank 2 and the reforming tank 8 arranged above the reaction tank 2 can be reduced, and the apparatus can be made compact. . Therefore, when newly installing a reforming tank or remodeling an existing apparatus, layout design of the reforming tank is facilitated.
本発明で処理対象とする原水としては、フッ素含有排水、リン含有排水、鉄、亜鉛、銅、クロム、ニッケル、鉛、アルミなどの重金属含有排水などが例示されるが、これらに限定されない。
Examples of raw water to be treated in the present invention include, but are not limited to, fluorine-containing wastewater, phosphorus-containing wastewater, and heavy metal-containing wastewater such as iron, zinc, copper, chromium, nickel, lead, and aluminum.
上記実施の形態では、改質槽８にアルカリ剤として消石灰を添加しているが、これに限定されるものではなく、重金属含有排水の場合、苛性ソーダなどであってもよい。
In the above embodiment, slaked lime is added as an alkali agent to the reforming tank 8, but it is not limited to this, and caustic soda or the like may be used in the case of wastewater containing heavy metals.
上記実施の形態は本発明の一例であり、本発明は上記以外の態様とされてもよい。
The above embodiment is an example of the present invention, and the present invention may be in aspects other than those described above.
本発明を特定の態様を用いて詳細に説明したが、本発明の意図と範囲を離れることなく様々な変更が可能であることは当業者に明らかである。
本出願は、２０２１年１１月１９日付で出願された日本特許出願２０２１－１８８４９８に基づいており、その全体が引用により援用される。 Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2021-188498 filed on November 19, 2021, which is incorporated by reference in its entirety.
本出願は、２０２１年１１月１９日付で出願された日本特許出願２０２１－１８８４９８に基づいており、その全体が引用により援用される。 Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2021-188498 filed on November 19, 2021, which is incorporated by reference in its entirety.
２ 反応槽
３ 凝集反応槽
４ 沈殿槽
８ 改質槽
９ 消石灰添加装置
２０ 撹拌機
２３ 汚泥流出配管 2Reaction tank 3 Aggregation reaction tank 4 Sedimentation tank 8 Reforming tank 9 Slaked lime addition device 20 Stirrer 23 Sludge outflow pipe
３ 凝集反応槽
４ 沈殿槽
８ 改質槽
９ 消石灰添加装置
２０ 撹拌機
２３ 汚泥流出配管 2
Claims (5)
- 反応槽にて排水にアルカリ剤添加返送汚泥を添加して反応させ、次いで凝集処理した後、固液分離処理して汚泥を処理水から分離し、
分離した汚泥の一部を返送汚泥とし、この返送汚泥を改質槽に導入して前記アルカリ剤を添加して前記排水に添加し、
汚泥の残部を引き抜き汚泥として排出し、
前記反応槽内のｐＨが所定範囲となるように改質槽へのアルカリ添加量を制御する排水の処理方法において、
前記改質槽の汚泥の滞留時間を１～５分とすることを特徴とする排水の処理方法。 In a reaction tank, the returned sludge with an alkaline agent added is added to the wastewater to react with it, then after flocculation treatment, solid-liquid separation treatment is performed to separate the sludge from the treated water,
A part of the separated sludge is used as return sludge, and the return sludge is introduced into a reforming tank, and the alkali agent is added to the waste water,
The rest of the sludge is extracted and discharged as sludge,
In the wastewater treatment method for controlling the amount of alkali added to the reforming tank so that the pH in the reaction tank is within a predetermined range,
A method for treating wastewater, characterized in that the retention time of the sludge in the reforming tank is 1 to 5 minutes. - 前記アルカリ剤は消石灰である、請求項１の排水の処理方法。 The wastewater treatment method according to claim 1, wherein the alkaline agent is slaked lime.
- 排水に改質槽からのアルカリ剤添加返送汚泥を添加する反応槽と、
該反応槽からの液に高分子凝集剤を添加する凝集槽と、
該凝集剤が添加された凝集処理液を固液分離する固液分離手段と、
該固液分離手段で分離された汚泥の一部にアルカリ剤を添加して前記アルカリ剤添加返送汚泥とする改質槽と
を備えてなる排水の処理装置において、
該改質槽の汚泥滞留時間が１～５分となるように該改質槽の容積が設定されていることを特徴とする排水の処理装置。 a reaction tank for adding alkaline agent-added return sludge from the reforming tank to waste water;
a flocculation tank for adding a polymer flocculant to the liquid from the reaction tank;
solid-liquid separation means for solid-liquid separation of the aggregating treatment liquid to which the aggregating agent has been added;
A wastewater treatment apparatus comprising a reforming tank, wherein an alkaline agent is added to a portion of the sludge separated by the solid-liquid separation means to produce the alkaline agent-added return sludge,
A wastewater treatment apparatus, wherein the volume of the reforming tank is set so that the sludge retention time in the reforming tank is 1 to 5 minutes. - 前記改質槽は前記反応槽の上方に配置されている、請求項３の排水の処理装置。 The waste water treatment apparatus according to claim 3, wherein the reforming tank is arranged above the reaction tank.
- 前記改質槽は、槽側壁面の上部に汚泥流出口が設けられており、
該汚泥流出口に連なる汚泥流出配管が鉛直下方に延在しており、該汚泥流出配管からの汚泥が前記反応槽に導入される、請求項４の排水処理装置。 The reforming tank is provided with a sludge outlet at the upper part of the side wall surface of the tank,
5. A wastewater treatment apparatus according to claim 4, wherein a sludge outflow pipe connected to said sludge outflow port extends vertically downward, and sludge from said sludge outflow pipe is introduced into said reaction tank.
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| JP2021188498A JP2023075535A (en) | 2021-11-19 | 2021-11-19 | Apparatus for treating waste water |
| JP2021-188498 | 2021-11-19 |
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| WO2023089927A1 true WO2023089927A1 (en) | 2023-05-25 |
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| PCT/JP2022/034057 WO2023089927A1 (en) | 2021-11-19 | 2022-09-12 | Waste water treatment method and device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08132066A (en) * | 1994-11-11 | 1996-05-28 | Kurita Water Ind Ltd | Treatment of metal-containing waste water |
| JP2006255623A (en) * | 2005-03-18 | 2006-09-28 | Kuniyasu Koide | Agitation apparatus with enhanced agitation efficiency by keeping liquid level constant |
| JP2009022873A (en) * | 2007-07-19 | 2009-02-05 | Nagoya City | Sludge flocculating/mixing device |
| JP2010234300A (en) * | 2009-03-31 | 2010-10-21 | Kurita Water Ind Ltd | Method for treating wastewater containing inorganic ion |
| JP2011177640A (en) * | 2010-03-01 | 2011-09-15 | Kurita Water Ind Ltd | Metal-containing water treatment method and metal-containing water treatment apparatus |
| JP2011189336A (en) * | 2010-03-12 | 2011-09-29 | Korea Inst Of Geoscience & Mineral Resources | Radon reducing device for ground water equipped with disinfection means |
-
2021
- 2021-11-19 JP JP2021188498A patent/JP2023075535A/en active Pending
-
2022
- 2022-09-12 WO PCT/JP2022/034057 patent/WO2023089927A1/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08132066A (en) * | 1994-11-11 | 1996-05-28 | Kurita Water Ind Ltd | Treatment of metal-containing waste water |
| JP2006255623A (en) * | 2005-03-18 | 2006-09-28 | Kuniyasu Koide | Agitation apparatus with enhanced agitation efficiency by keeping liquid level constant |
| JP2009022873A (en) * | 2007-07-19 | 2009-02-05 | Nagoya City | Sludge flocculating/mixing device |
| JP2010234300A (en) * | 2009-03-31 | 2010-10-21 | Kurita Water Ind Ltd | Method for treating wastewater containing inorganic ion |
| JP2011177640A (en) * | 2010-03-01 | 2011-09-15 | Kurita Water Ind Ltd | Metal-containing water treatment method and metal-containing water treatment apparatus |
| JP2011189336A (en) * | 2010-03-12 | 2011-09-29 | Korea Inst Of Geoscience & Mineral Resources | Radon reducing device for ground water equipped with disinfection means |
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