JP4071134B2 - Water purification membrane treatment equipment - Google Patents

Water purification membrane treatment equipment Download PDF

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Publication number
JP4071134B2
JP4071134B2 JP2003061038A JP2003061038A JP4071134B2 JP 4071134 B2 JP4071134 B2 JP 4071134B2 JP 2003061038 A JP2003061038 A JP 2003061038A JP 2003061038 A JP2003061038 A JP 2003061038A JP 4071134 B2 JP4071134 B2 JP 4071134B2
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membrane
water
treatment device
membrane treatment
concentrating
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JP2003061038A
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JP2004267887A (en
Inventor
寅太郎 峯岸
昇一 須田
吉彦 森
高史 小川
謙三 菅谷
秀吉 松原
喜則 正岡
俊文 椋橋
圭三 村田
秀治 山田
照啓 北沢
洋一 広瀬
康宏 中村
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Sanki Engineering Co Ltd
Ishigaki Co Ltd
JFE Engineering Corp
Asahi Kasei Chemicals Corp
Hitachi Plant Technologies Ltd
Sumitomo Heavy Industries Environment Co Ltd
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Sanki Engineering Co Ltd
Ishigaki Co Ltd
JFE Engineering Corp
Asahi Kasei Chemicals Corp
Hitachi Plant Technologies Ltd
Sumitomo Heavy Industries Environment Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、浄水膜処理装置、特に、膜利用型浄水場において、膜処理装置から排出される物理洗浄排水を効率的に処理して、浄水回収率を向上させることができる浄水膜処理装置に関するものである。
【０００２】
【従来の技術】
膜ろ過処理を利用した従来の浄水処理を、図面を参照しながら説明する。
【０００３】
図４は、膜ろ過処理を行っている浄水場における従来処理フローを示す図である。
【０００４】
同図の浄水処理では、河川等から取水した原水を着水井２０で受水した後、原水中の夾雑物を除去するための前処理装置２１へ導き、膜処理装置２２にて原水中の懸濁成分、病原性原虫類および細菌類を除去する。膜処理装置２２より得られた膜ろ過水は、滅菌処理装置３１により塩素消毒を行って、水道水として供給される。その際の浄水回収率は、９０〜９５％程度である。膜処理装置２２において、定期的に物理洗浄操作が実施されており、洗浄によって排出された物理洗浄排水は、排水池２３へ送られ、汚泥と上澄水とに分離される。汚泥は、濃縮槽２４において重力により沈降濃縮されて脱水機２５に供給される。濃縮槽２４からの上澄水は、排水池２３からの上澄水と共に回収率を向上させる目的により着水井２０へ返送される。
【０００５】
上記構成の従来方式では、原水濁度が高い場合には、物理洗浄排水中の固形物濃度も高くなるため、濃縮槽２４において重力による沈降濃縮を適用することが可能である。しかしながら、原水濁度が低い場合には、物理洗浄排水中の固形物濃度が低くなるため、汚泥の沈降速度が遅くなり、濃縮槽２４において重力による沈降濃縮を適用することが困難となる。
【０００６】
この問題を解決するために、濃縮槽２４において凝集剤としてポリ塩化アルミニウム（ＰＡＣ）や高分子凝集剤を使用して汚泥の沈降性を向上させる必要がある。
【０００７】
また、図５における標準的な膜利用型浄水処理では、河川等から取水した原水を着水井２０で受水した後、原水中の夾雑物を除去するために、ポリ塩化アルミニウム（ＰＡＣ）等の無機系凝集剤２６を添加して凝集混和装置２７に導き、膜処理装置２８に圧入して膜ろ過を行い、原水中の懸濁成分、病原性原虫類および細菌類を除去する。膜処理装置２８より得られた膜ろ過水は、滅菌処理装置３１によって塩素消毒を行って、水道水として供給される。その際の浄水回収率は、９５〜９８％程度である。膜処理装置２８では、定期的に物理洗浄操作が実施されており、洗浄によって排出された物理洗浄排水はシックナー２９へ導かれ、濃縮汚泥と上澄水とに分離される。濃縮汚泥は、脱水機３０に供給され、上澄水は、回収率を向上させる目的により着水井２０へ返送される。
【０００８】
【発明が解決しようとする課題】
以上のように、従来方式の図４および図５において、凝集剤が添加される場合が一般的である。凝集剤を添加した濃縮汚泥が脱水機２５、３０に投入された場合、脱水機２５、３０における汚泥の脱水速度が大幅に減少し、脱水機の必要台数が増加するという問題がある。また、脱水汚泥中にアルミニウムを含む場合には、その有効利用が困難であるという問題がある。
【０００９】
従って、本発明は、上記のような課題を克服すべく鋭意研究の結果完成されたものであって、凝集剤を添加することなく膜処理装置から発生する物理洗浄排水を年間を通じてほぼ一定した汚泥濃度まで濃縮すると共に、システム全体の浄水回収率を９９．９％以上とし、脱水機における脱水速度を向上させ、脱水汚泥の有効利用に係る弊害を少なくすることができる浄水膜処理装置を提供することを目的としている。
【００１０】
【課題を解決するための手段】
本発明は、上記課題を解決するためになされたものであり、下記を特徴とするものである。
【００１１】
請求項１記載の発明は、河川等から取水した原水を受水する着水井と、前記着水井からの原水を前処理する前処理装置と、前記前処理装置により前処理された原水を膜ろ過処理する第１膜処理装置と、前記第１膜処理装置からの物理洗浄排水をさらに膜ろ過する第２膜処理装置と、前記第１膜処理装置からの膜ろ過水を滅菌処理する滅菌処理装置と、前記第２膜処理装置からの物理洗浄排水を濃縮する濃縮装置と、前記濃縮装置により濃縮された汚泥を脱水する脱水機とを備えている浄水膜処理装置において、前記第２膜処理装置からの膜ろ過水は、前記滅菌処理装置に送られ、前記濃縮装置からの処理水は、前記第２膜処理装置に返送されることに特徴を有するものである。
【００１２】
請求項２記載の発明は、河川等から取水した原水を受水する着水井と、前記着水井からの原水を前処理する前処理装置と、前記前処理装置により前処理された原水を膜ろ過処理する第１膜処理装置と、前記第１膜処理装置からの物理洗浄排水をさらに膜ろ過する第２膜処理装置と、前記第１膜処理装置からの膜ろ過水を滅菌処理する滅菌処理装置と、前記第２膜処理装置からの物理洗浄排水を濃縮する濃縮装置と、前記濃縮装置により濃縮された汚泥を脱水する脱水機とを備えている浄水膜処理装置において、前記第２膜処理装置からの膜ろ過水は、前記第１膜処理装置に返送され、前記濃縮装置からの処理水は、前記第２膜処理装置に返送されることに特徴を有するものである。
【００１８】
【発明の実施の形態】
以下、本発明の浄水膜処理装置の一実施態様を、図面を参照しながら説明する。
【００１９】
図１は、本発明の浄水膜処理装置による処理フローを示す図である。
【００２０】
図１において、１は、主として、河川等から取水した原水を受水する着水井、２は、原水中の夾雑物を除去するための前処理装置、３は、原水中の懸濁成分、病原性原虫類および細菌類を除去するための第１膜処理装置、４は、第１膜処理装置３において定期的に実施する物理洗浄操作により排出された物理洗浄排水中の懸濁成分、病原性原虫類および細菌類を除去するための第２膜処理装置、５は、第２膜処理装置４において定期的に実施する物理洗浄操作により排出された物理洗浄排水を濃縮するための濃縮装置、６は、濃縮装置５において濃縮された汚泥を脱水する脱水機、そして、７は、第１膜処理装置３および第２膜処理装置４からの膜ろ過水を滅菌処理するための滅菌処理装置である。
【００２１】
前処理装置２は、原水中の夾雑物を除去する目的で、例えばオートストレーナーのような簡易型回転固液分離器を用いることができる。
【００２２】
また、第１および第２膜処理装置３および４において使用される分離膜は、有機膜および無機膜の何れでも良く、また、精密ろ過膜および限外ろ過膜の何れでも良い。具体的には、精密ろ過膜としては、公称孔径０．０１から０．４５μｍのものが好ましく、限外ろ過膜としては、公称分画分子量１０００から１００万ダルトンのものが好ましい。膜モジュールの形状は、中空糸状、スパイラル状、チューブラ状、または、平膜状が用いられる。膜モジュールのろ過方式は、全量ろ過方式およびクロスフローろ過方式の何れの方式としても良く、膜ろ過への通水方式は、外圧型および内圧型の何れでも問題ない。さらに、原水側を加圧する加圧型のケーシングタイプ、あるいはろ過水側を減圧する吸引型の槽浸漬タイプの何れであっても良い。
【００２３】
また、濃縮装置５では、第２膜処理装置４からの物理洗浄排水を汚泥の固形物濃度が１から６％となるまで濃縮することができ、濃縮装置の方式は、重力濃縮、膜濃縮、機械濃縮および浮上濃縮の何れであっても良い。
【００２４】
上述した、本発明の浄水膜処理装置によれば、以下のようにして、原水を処理する。
【００２５】
先ず、河川等から取水した原水を着水井１で受水した後、原水中の夾雑物を除去するための前処理装置２へ導き、第１膜処理装置３にて原水中の懸濁成分、病原性原虫類および細菌類を除去する。第１膜処理装置３において得られた膜ろ過水は、滅菌処理装置７により塩素消毒を行って水道水として供給される。
【００２６】
第１膜処理装置３において、定期的に実施する物理洗浄操作により排出された物理洗浄排水は、第２膜処理装置４に送水され、さらに懸濁成分、病原性原虫類および細菌類を除去する。このように、第１膜処理装置３により膜ろ過された後の物理洗浄排水を第２膜処理装置４によりさらに膜ろ過することによって、従来のように、原水に凝集剤を添加する必要がなくなる。
【００２７】
第２膜処理装置４において得られた膜ろ過水は、滅菌処理装置７に返送し、塩素消毒を行って水道水として供給される。第２膜処理装置４において、定期的に実施する物理洗浄操作により排出された物理洗浄排水は、濃縮装置５へ送られて処理される。濃縮装置５より得られた処理水は、水路８ａから第２膜処理装置４へ送水されることにより、トータルの浄水回収率９９．９％以上を得ることができる。一方、濃縮装置５より間欠的、あるいは連続的に得られた濃縮汚泥は、脱水機６へ送られ脱水される。
【００２８】
上記浄水膜処理装置において、第２膜処理装置４からの膜ろ過水を滅菌処理装置７に返送する代わりに、図２に示すように、第１膜処理装置３に返送しても良い。
【００２９】
次に、本発明のさらに他の浄水膜処理装置について、図面を参照しながら説明する。
【００３０】
図３は、本発明のさらに他の浄水膜処理装置による処理フローを示す図である。図３において、図１と同一部分には同一符号が付与されており、同一部分の説明は省略する。
【００３１】
図３の浄水膜処理装置では、濃縮装置として膜濃縮装置９を用いており、第２膜処理装置４から定期的に実施する物理洗浄操作により排出された物理洗浄排水を汚泥の固形物濃度が１から６％となるまで濃縮する。図３の浄水膜処理装置においても、第１膜処理装置３により膜ろ過された後の物理洗浄排水を第２膜処理装置４によりさらに膜ろ過することによって、従来のように、原水に凝集剤を添加する必要がなくなる。さらに、膜濃縮装置９より得られた膜ろ過水は、水路８ｂから滅菌処理装置７により塩素消毒を行って水道水として供給されることにより、トータルの浄水回収率９９．９％以上を得ることができる。
【００３２】
ここで、膜濃縮装置９において使用される分離膜は、有機膜および無機膜の何れでも良く、また、精密ろ過膜および限外ろ過膜の何れでも良い。膜モジュールの形状は、中空糸状、スパイラル状、チューブラ状、または平膜状が用いられる。膜モジュールのろ過方式は、全量ろ過方式およびクロスフローろ過方式の何れの方式としても良く、膜ろ過への通水方式は、外圧型および内圧型の何れでも問題ない。さらに、原水側を加圧する加圧型のケーシングタイプ、あるいはろ過水側を減圧する吸引型の槽浸漬タイプの何れであっても良い。
【００３３】
【実施例】
次に、本発明の浄水膜処理装置を、実施例によりさらに詳細に説明する。なお、以下の実施例によって、本発明を限定するものではない。
【００３４】
（実施例１）
図３に示す浄水処理フローに従って原水を処理する。原水の平均濁度は５度であり、前処理装置２には、オートストレーナーを配置して、原水中の夾雑物を除去する。第１および第２膜処理装置３および４の仕様ならびに運転条件は表１に示した通りである。
【００３５】
【表１】

Figure 0004071134
【００３６】
第２膜処理装置４から排出された固形物濃度０．１％の物理洗浄排水を、表２に示した仕様の膜濃縮装置９に通水して膜ろ過処理した結果、膜ろ過水の回収率９５％が得られ、濃縮汚泥の固形物濃度が２％であった。得られた膜ろ過水の水質分析結果を表３に示した。表３より、本実施例において得られた膜ろ過水は、水道水水質基準を満足することが分かり、塩素消毒装置へ送り滅菌処理を実施して水道水として供給した。その結果、システム全体の浄水回収率は９９．９８％であった。
【００３７】
【表２】
Figure 0004071134
【００３８】
【表３】
Figure 0004071134
【００３９】
【発明の効果】
以上述べたように、本発明の浄水膜処理装置によれば、凝集剤を添加することなくシステム全体の浄水回収率を９９．９％以上まで向上させることができる。また、固形物濃度１から６％の汚泥を脱水機へ投入することができ、脱水機における脱水速度の向上を図ることができる。さらに、脱水汚泥にアルミニウムを含まないため、脱水汚泥の有効利用に係る弊害を少なくする等、工業上有用な効果がもたらされる。
【図面の簡単な説明】
【図１】本発明の浄水膜処理装置による処理フローを示す図である。
【図２】本発明の他の浄水膜処理装置による処理フローを示す図である。
【図３】本発明のさらに他の浄水膜処理装置による処理フローを示す図である。
【図４】膜ろ過処理を行っている浄水場における従来処理フローを示す図である。
【図５】膜ろ過処理を行っている浄水場における他の従来処理フローを示す図である。
【符号の説明】
１：着水井
２：前処理装置
３：第１膜処理装置
４：第２膜処理装置
５：濃縮装置
６：脱水機
７：滅菌処理装置
８ａ、８ｂ：水路
９：膜濃縮装置
２０：着水井
２１：前処理装置
２２：膜処理装置
２３：排水池
２４：濃縮槽
２５：脱水機
２６：無機系凝集剤
２７：凝集混和装置
２８：膜処理装置
２９：シックナー
３０：脱水機
３１：滅菌処理装置[0001]
BACKGROUND OF THE INVENTION
The invention, water purification membrane treatment MakotoSo location, in particular, in the film-using purification plants, processes the physical washing waste water discharged from the membrane treatment apparatus efficiently, water purification membranes processing capable of improving the water purification recovery it relates to MakotoSo location.
[0002]
[Prior art]
A conventional water purification process using a membrane filtration process will be described with reference to the drawings.
[0003]
Drawing 4 is a figure showing the conventional processing flow in the water purification plant which is performing membrane filtration processing.
[0004]
In the water purification treatment shown in the figure, raw water taken from a river or the like is received by a landing well 20 and then guided to a pretreatment device 21 for removing impurities in the raw water. Remove turbid components, pathogenic protozoa and bacteria. The membrane filtrate obtained from the membrane treatment device 22 is sterilized by the sterilization treatment device 31 and supplied as tap water. The purified water recovery rate in that case is about 90 to 95%. In the membrane treatment device 22, physical cleaning operations are periodically performed, and the physical cleaning wastewater discharged by the cleaning is sent to the drainage basin 23 and separated into sludge and supernatant water. The sludge is settled and concentrated by gravity in the concentration tank 24 and supplied to the dehydrator 25. The supernatant water from the concentration tank 24 is returned to the landing well 20 together with the supernatant water from the drainage basin 23 for the purpose of improving the recovery rate.
[0005]
In the conventional system having the above configuration, when the raw water turbidity is high, the solid matter concentration in the physical washing wastewater is also high, so that sedimentation concentration by gravity can be applied in the concentration tank 24. However, when the raw water turbidity is low, the solid matter concentration in the physical washing wastewater is low, so that the sludge sedimentation rate is slow, and it is difficult to apply sedimentation concentration by gravity in the concentration tank 24.
[0006]
In order to solve this problem, it is necessary to improve the sedimentation property of sludge by using polyaluminum chloride (PAC) or a polymer flocculant as a flocculant in the concentration tank 24.
[0007]
Further, in the standard membrane-based water purification treatment in FIG. 5, after receiving raw water taken from a river or the like by the landing well 20, polyaluminum chloride (PAC) or the like is used to remove contaminants in the raw water. An inorganic flocculant 26 is added to the flocculent mixing device 27, and it is pressed into the membrane treatment device 28 and subjected to membrane filtration to remove suspended components, pathogenic protozoa and bacteria in the raw water. The membrane filtrate obtained from the membrane treatment device 28 is sterilized by the sterilization treatment device 31 and supplied as tap water. The purified water recovery rate in that case is about 95 to 98%. In the membrane treatment device 28, physical cleaning operations are periodically performed, and the physical cleaning wastewater discharged by the cleaning is guided to the thickener 29 and separated into concentrated sludge and supernatant water. The concentrated sludge is supplied to the dehydrator 30 and the supernatant water is returned to the landing well 20 for the purpose of improving the recovery rate.
[0008]
[Problems to be solved by the invention]
As described above, in FIG. 4 and FIG. 5 of the conventional method, the case where the flocculant is added is common. When the concentrated sludge to which the flocculant is added is put into the dehydrators 25 and 30, there is a problem that the dewatering speed of the sludge in the dehydrators 25 and 30 is significantly reduced and the required number of dehydrators is increased. Moreover, when aluminum is contained in dewatered sludge, there exists a problem that the effective utilization is difficult.
[0009]
Therefore, the present invention has been completed as a result of intensive studies to overcome the above-described problems, and the physical cleaning wastewater generated from the membrane treatment apparatus without adding a flocculant is almost constant throughout the year. with concentrated to a concentration, the purified water recovery rate of the entire system and 99.9%, to improve the dewatering rate in dehydrator, a water purification membrane treatment MakotoSo location it is possible to reduce the adverse effect of the effective utilization of dewatered sludge It is intended to provide.
[0010]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems, and is characterized by the following.
[0011]
The invention according to claim 1 is a receiving well that receives raw water taken from a river, a pretreatment device that pretreats raw water from the landing well, and membrane filtration of the raw water pretreated by the pretreatment device A first membrane treatment device to be treated, a second membrane treatment device for further membrane filtration of the physical cleaning waste water from the first membrane treatment device, and a sterilization treatment device for sterilizing membrane filtration water from the first membrane treatment device A water purification membrane treatment apparatus comprising: a concentrating device for concentrating physical washing wastewater from the second membrane treatment device; and a dehydrator for dewatering sludge concentrated by the concentrating device. The membrane filtered water from is sent to the sterilization apparatus, and the treated water from the concentrator is returned to the second membrane treatment apparatus.
[0012]
The invention according to claim 2 is a receiving well that receives raw water taken from a river, a pretreatment device that pretreats raw water from the landing well, and membrane filtration of the raw water pretreated by the pretreatment device A first membrane treatment device to be treated, a second membrane treatment device for further membrane filtration of the physical cleaning waste water from the first membrane treatment device, and a sterilization treatment device for sterilizing membrane filtration water from the first membrane treatment device A water purification membrane treatment apparatus comprising: a concentrating device for concentrating physical washing wastewater from the second membrane treatment device; and a dehydrator for dewatering sludge concentrated by the concentrating device. The membrane filtered water from is returned to the first membrane treatment device, and the treated water from the concentrating device is returned to the second membrane treatment device .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the water purification membrane treatment apparatus of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a diagram showing a processing flow by the water purification membrane processing apparatus of the present invention.
[0020]
In FIG. 1, 1 is a landing well that mainly receives raw water taken from a river or the like, 2 is a pretreatment device for removing impurities in the raw water, 3 is a suspended component in the raw water, pathogen The first membrane treatment device 4 for removing protozoa and bacteria is a suspended component in the physical cleaning wastewater discharged by the physical cleaning operation periodically performed in the first membrane processing device 3, pathogenicity A second membrane treatment device 5 for removing protozoa and bacteria, a concentrating device 6 for concentrating the physical cleaning wastewater discharged by the physical cleaning operation performed periodically in the second membrane processing device 4, 6 Is a dehydrator for dewatering the sludge concentrated in the concentrating device 5, and 7 is a sterilizing device for sterilizing the membrane filtrate from the first membrane processing device 3 and the second membrane processing device 4. .
[0021]
The pretreatment device 2 can use a simple rotating solid-liquid separator such as an auto strainer for the purpose of removing impurities in the raw water.
[0022]
Further, the separation membrane used in the first and second membrane treatment apparatuses 3 and 4 may be either an organic membrane or an inorganic membrane, and may be either a microfiltration membrane or an ultrafiltration membrane. Specifically, the microfiltration membrane preferably has a nominal pore size of 0.01 to 0.45 μm, and the ultrafiltration membrane preferably has a nominal molecular weight cut off of 1,000 to 1,000,000 daltons. As the shape of the membrane module, a hollow fiber shape, a spiral shape, a tubular shape, or a flat membrane shape is used. The filtration method of the membrane module may be either a whole-volume filtration method or a cross flow filtration method, and the water passage method to the membrane filtration may be either an external pressure type or an internal pressure type. Furthermore, either a pressurized casing type that pressurizes the raw water side or a suction-type tank immersion type that depressurizes the filtered water side may be used.
[0023]
Further, in the concentrating device 5, the physical washing waste water from the second membrane processing device 4 can be concentrated until the sludge solids concentration becomes 1 to 6%. Either mechanical concentration or levitation concentration may be used.
[0024]
According to the water purification membrane treatment apparatus of the present invention described above, raw water is treated as follows.
[0025]
First, raw water taken from a river or the like is received by the landing well 1 and then guided to a pretreatment device 2 for removing contaminants in the raw water. In the first membrane treatment device 3, suspended components in the raw water, Remove pathogenic protozoa and bacteria. The membrane filtrate obtained in the first membrane treatment device 3 is sterilized by the sterilization treatment device 7 and supplied as tap water.
[0026]
In the first membrane treatment device 3, the physical washing wastewater discharged by the physical washing operation carried out periodically is sent to the second membrane treatment device 4 to further remove suspended components, pathogenic protozoa and bacteria. . As described above, the physical washing waste water after being membrane-filtered by the first membrane treatment device 3 is further membrane-filtered by the second membrane treatment device 4, so that it is not necessary to add a flocculant to the raw water as in the prior art. .
[0027]
The membrane filtered water obtained in the second membrane treatment device 4 is returned to the sterilization treatment device 7, sterilized with chlorine, and supplied as tap water. In the second membrane treatment device 4, the physical cleaning wastewater discharged by the physical cleaning operation performed periodically is sent to the concentration device 5 for processing. The treated water obtained from the concentrating device 5 is sent from the water channel 8a to the second membrane treatment device 4, whereby a total water purification rate of 99.9% or more can be obtained. On the other hand, the concentrated sludge obtained intermittently or continuously from the concentration device 5 is sent to the dehydrator 6 and dehydrated.
[0028]
In the water purification membrane treatment apparatus, instead of returning the membrane filtrate from the second membrane treatment apparatus 4 to the sterilization treatment apparatus 7, it may be returned to the first membrane treatment apparatus 3 as shown in FIG.
[0029]
Next, the other water purification membrane treatment apparatus of al of the present invention will be described with reference to the drawings.
[0030]
FIG. 3 is a diagram showing a processing flow by still another water purification membrane processing apparatus of the present invention. In FIG. 3, the same parts as those in FIG.
[0031]
In the water purification membrane treatment apparatus of FIG. 3, the membrane concentration device 9 is used as the concentration device, and the solid concentration of sludge is the same as the physical washing wastewater discharged from the second membrane treatment device 4 by the physical washing operation performed periodically. Concentrate to 1-6%. Also in the water purification membrane treatment apparatus of FIG. 3, the physical cleaning waste water after membrane filtration by the first membrane treatment apparatus 3 is further membrane-filtered by the second membrane treatment apparatus 4, so that the flocculant is added to the raw water as in the past Need not be added. Furthermore, the membrane filtrate obtained from the membrane concentrator 9 is sterilized by the sterilizer 7 from the water channel 8b and supplied as tap water, thereby obtaining a total water purification rate of 99.9% or more. Can do.
[0032]
Here, the separation membrane used in the membrane concentrating device 9 may be either an organic membrane or an inorganic membrane, and may be either a microfiltration membrane or an ultrafiltration membrane. As the shape of the membrane module, a hollow fiber shape, a spiral shape, a tubular shape, or a flat membrane shape is used. The filtration method of the membrane module may be either a whole-volume filtration method or a cross-flow filtration method, and the water flow method to the membrane filtration may be either an external pressure type or an internal pressure type. Furthermore, either a pressurized casing type that pressurizes the raw water side or a suction-type tank immersion type that depressurizes the filtered water side may be used.
[0033]
【Example】
Next, the water purification membrane treatment apparatus of the present invention will be described in more detail with reference to examples. The present invention is not limited to the following examples.
[0034]
Example 1
Raw water is treated according to the water purification treatment flow shown in FIG. The average turbidity of the raw water is 5 degrees, and an auto strainer is disposed in the pretreatment device 2 to remove impurities in the raw water. The specifications and operating conditions of the first and second film processing apparatuses 3 and 4 are as shown in Table 1.
[0035]
[Table 1]
Figure 0004071134
[0036]
The physical washing waste water with a solid concentration of 0.1% discharged from the second membrane treatment device 4 is passed through the membrane concentration device 9 having the specifications shown in Table 2 and subjected to membrane filtration treatment. A rate of 95% was obtained, and the solid content of the concentrated sludge was 2%. Table 3 shows the results of water quality analysis of the obtained membrane filtrate. From Table 3, it was found that the membrane filtrate obtained in this example satisfied the quality standard for tap water, and was sent to a chlorine disinfection device, sterilized, and supplied as tap water. As a result, the purified water recovery rate of the entire system was 99.98%.
[0037]
[Table 2]
Figure 0004071134
[0038]
[Table 3]
Figure 0004071134
[0039]
【The invention's effect】
As described above, according to the water purification membrane treatment apparatus of the present invention, the water purification rate of the entire system can be improved to 99.9% or more without adding a flocculant. Further, sludge having a solid concentration of 1 to 6% can be charged into the dehydrator, and the dehydration rate in the dehydrator can be improved. Further, since aluminum is not contained in the dewatered sludge, industrially useful effects are brought about, such as reducing harmful effects on the effective use of the dewatered sludge.
[Brief description of the drawings]
FIG. 1 is a diagram showing a treatment flow by a water purification membrane treatment apparatus of the present invention.
FIG. 2 is a diagram showing a treatment flow by another water purification membrane treatment apparatus of the present invention.
FIG. 3 is a view showing a processing flow by still another water purification membrane processing apparatus of the present invention.
FIG. 4 is a diagram showing a conventional processing flow in a water purification plant performing membrane filtration processing.
FIG. 5 is a diagram showing another conventional treatment flow in a water purification plant performing membrane filtration treatment.
[Explanation of symbols]
1: Water landing well 2: Pretreatment device 3: First membrane treatment device 4: Second membrane treatment device 5: Concentration device 6: Dehydrator 7: Sterilization treatment device 8a, 8b: Water channel 9: Membrane concentration device 20: Water well 21: Pretreatment device 22: Membrane treatment device 23: Drainage pond 24: Concentration tank 25: Dehydrator 26: Inorganic flocculant 27: Coagulation mixer 28: Membrane treatment device 29: Thickener 30: Dehydrator 31: Sterilization device

Claims (2)

河川等から取水した原水を受水する着水井と、前記着水井からの原水を前処理する前処理装置と、前記前処理装置により前処理された原水を膜ろ過処理する第１膜処理装置と、前記第１膜処理装置からの物理洗浄排水をさらに膜ろ過する第２膜処理装置と、前記第１膜処理装置からの膜ろ過水を滅菌処理する滅菌処理装置と、前記第２膜処理装置からの物理洗浄排水を濃縮する濃縮装置と、前記濃縮装置により濃縮された汚泥を脱水する脱水機とを備えている浄水膜処理装置において、
前記第２膜処理装置からの膜ろ過水は、前記滅菌処理装置に送られ、前記濃縮装置からの処理水は、前記第２膜処理装置に返送されることを特徴とする浄水膜処理装置。 A landing well that receives raw water taken from a river, a pretreatment device that pretreats the raw water from the landing well, and a first membrane treatment device that performs membrane filtration treatment of the raw water pretreated by the pretreatment device, A second membrane treatment device that further membrane-filters the physical cleaning waste water from the first membrane treatment device, a sterilization treatment device that sterilizes the membrane filtration water from the first membrane treatment device, and the second membrane treatment device In a water purification membrane treatment apparatus comprising a concentrating device for concentrating the physical washing waste water from and a dehydrator for dewatering sludge concentrated by the concentrating device,
The membrane filtration water from the second membrane treatment device is sent to the sterilization treatment device, and the treatment water from the concentration device is returned to the second membrane treatment device. 河川等から取水した原水を受水する着水井と、前記着水井からの原水を前処理する前処理装置と、前記前処理装置により前処理された原水を膜ろ過処理する第１膜処理装置と、前記第１膜処理装置からの物理洗浄排水をさらに膜ろ過する第２膜処理装置と、前記第１膜処理装置からの膜ろ過水を滅菌処理する滅菌処理装置と、前記第２膜処理装置からの物理洗浄排水を濃縮する濃縮装置と、前記濃縮装置により濃縮された汚泥を脱水する脱水機とを備えている浄水膜処理装置において、
前記第２膜処理装置からの膜ろ過水は、前記第１膜処理装置に返送され、前記濃縮装置からの処理水は、前記第２膜処理装置に返送されることを特徴とする浄水膜処理装置。 A landing well that receives raw water taken from a river, a pretreatment device that pretreats the raw water from the landing well, and a first membrane treatment device that performs membrane filtration treatment of the raw water pretreated by the pretreatment device, A second membrane treatment device that further membrane-filters the physical cleaning waste water from the first membrane treatment device, a sterilization treatment device that sterilizes the membrane filtration water from the first membrane treatment device, and the second membrane treatment device In a water purification membrane treatment apparatus comprising a concentrating device for concentrating the physical washing waste water from and a dehydrator for dewatering sludge concentrated by the concentrating device,
The membrane filtration water from the second membrane treatment device is returned to the first membrane treatment device, and the treated water from the concentration device is returned to the second membrane treatment device. apparatus.
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