JP2001038353A - Treatment of wastewater - Google Patents
Treatment of wastewaterInfo
- Publication number
- JP2001038353A JP2001038353A JP11220600A JP22060099A JP2001038353A JP 2001038353 A JP2001038353 A JP 2001038353A JP 11220600 A JP11220600 A JP 11220600A JP 22060099 A JP22060099 A JP 22060099A JP 2001038353 A JP2001038353 A JP 2001038353A
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- JP
- Japan
- Prior art keywords
- silica
- wastewater
- treated water
- sent
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はシリカを高濃度に含
有する排水の処理方法に関するものであり、更に詳しく
は排水中からシリカを除去するとともに、そのシリカが
除去された処理水を有効に再利用できるようにした排水
の処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating wastewater containing silica at a high concentration. More specifically, the present invention relates to a method for removing silica from wastewater and effectively reusing treated water from which the silica has been removed. The present invention relates to a method for treating wastewater that can be used.
【０００２】[0002]
【従来の技術】各種工業排水に凝集濾過、活性炭濾過、
生物処理などの前処理を施した後、その処理水を限外濾
過装置や逆浸透装置で処理する方法は既に公知で従来か
ら採用されている。しかしながら、シリカを高濃度に含
有する排水を上記した従来の方法で処理しようとする
と、逆浸透装置でシリカが析出して膜にシリカが付着
し、逆浸透装置を透過する処理水が極端に低下して、期
待するほどの処理水を連続的に、かつ安定的に得ること
ができない。この対策としては、バッチ方式で所定時間
毎に逆浸透装置の膜を逆洗浄して、膜に付着したシリカ
を除去したり、あるいは膜モジュールを増やすことなど
が考えられるが、これらの方法を採用すると、余分な排
水貯蔵設備が必要となったり、経済的なコストが増大す
る上に、大量に発生する排水の処理には到底対応できな
い。BACKGROUND OF THE INVENTION Coagulation filtration, activated carbon filtration,
A method of treating a treated water with an ultrafiltration device or a reverse osmosis device after performing a pretreatment such as biological treatment is already known and conventionally employed. However, if the wastewater containing high concentration of silica is treated by the above-described conventional method, silica is precipitated in the reverse osmosis device and adheres to the membrane, and the treated water passing through the reverse osmosis device is extremely reduced. As a result, it is not possible to obtain the expected treated water continuously and stably. As a countermeasure, it is conceivable to backwash the membrane of the reverse osmosis device at predetermined time intervals in a batch system to remove silica adhering to the membrane or increase the number of membrane modules, but these methods are adopted. Then, an extra wastewater storage facility is required, the economic cost is increased, and the wastewater generated in large quantities cannot be treated at all.
【０００３】また、シリカは井戸水などの通常の地下水
にも低濃度ながら含まれており、シリカが低濃度に含有
する排水については、水質的にはそのまま一般河川に放
流しても構わないが、環境問題の点からこのような処理
水の有効活用が考えられており、シリカを除去した処理
水を再利用することが従来より検討されている。[0003] In addition, silica is contained in ordinary groundwater such as well water at a low concentration, and wastewater containing silica at a low concentration may be discharged to a general river as it is in terms of water quality. From the viewpoint of environmental problems, effective use of such treated water has been considered, and reuse of treated water from which silica has been removed has been conventionally studied.
【０００４】[0004]
【発明が解決しようとする課題】そこで、本発明は、排
水中に高濃度に含有するシリカを逆浸透装置での透過効
率がシリカによって低下しない程度まで予め除去して、
逆浸透装置の負荷を軽減するとともに、清澄な透過処理
水を効率よく得られるようにした、シリカを高濃度に含
有する排水の処理方法の提供を目的とするものである。SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for removing silica contained in wastewater at a high concentration in advance to such an extent that the permeation efficiency in a reverse osmosis device is not reduced by silica.
It is an object of the present invention to provide a method for treating wastewater containing silica at a high concentration, which can reduce the load on the reverse osmosis apparatus and efficiently obtain clear permeated water.
【０００５】[0005]
【課題を解決するための手段】本発明になる排水の処理
方法は、上記の目的を達成するために、シリカを高濃度
に含有する排水をバイオリアクターで分解処理した処理
水に、三価の金属化合物類を投入してから限外濾過装置
で濃縮・濾過し、限外濾過装置で濃縮した濃縮液を凝集
沈殿槽でシリカを分離しながら再度排水と混合して循環
させ、限外濾過装置で濾過した処理水を逆浸透装置で濃
縮・濾過することを特徴としている。According to the present invention, there is provided a method for treating wastewater, in which the wastewater containing a high concentration of silica is converted into treated water obtained by decomposing wastewater containing a high concentration of silica in a bioreactor. After the metal compounds are charged, the mixture is concentrated and filtered by an ultrafiltration device, and the concentrated solution concentrated by the ultrafiltration device is mixed with the wastewater again while separating silica in the coagulation sedimentation tank and circulated. The process water is filtered and concentrated by a reverse osmosis device.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施の形態を図面
に示す実施例に基づいて説明する。図１は本発明になる
排水の処理方法の全体概要図である。なお、ここで言う
排水とは、例えばリネンサプライ関連の施設から排出さ
れるもので、汚れ分、糊分、洗剤などの各種有機物の他
に無機塩類やクリーニングする際に一般的に助剤として
使用されるメタ珪酸ナトリウムなどが含有しており、シ
リカがＳｉＯ2換算で５０〜１００ｐｐｍの高濃度で含
有されているものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is an overall schematic diagram of a wastewater treatment method according to the present invention. The wastewater referred to here is, for example, discharged from facilities related to linen supply, and is generally used as an auxiliary agent when cleaning, in addition to various organic substances such as dirt, glue, detergent, and inorganic salts. And the like, and silica is contained at a high concentration of 50 to 100 ppm in terms of SiO 2 .
【０００７】そもそもシリカは上記したように通常の地
下水にも含まれているので、有機物さえ処理すれば、水
質的にはそのままの状態で一般河川に放流することがで
きるが、大規模なリネンサプライ施設などではシリカを
高濃度に含有する排水が２００〜３００ｍ3／Ｄも発生
しているので、シリカを除去した処理水を如何に回収し
て再利用するかが重要な経営問題となっている。本発明
はこれを解決するものである。[0007] Since silica is contained in ordinary groundwater as described above, it can be discharged to general rivers in the same state of water quality as long as it is treated with organic matter. Since wastewater containing silica at a high concentration is generated in facilities such as 200 to 300 m 3 / D, it is an important management issue how to collect and reuse the treated water from which silica has been removed. . The present invention solves this.
【０００８】図１において、（１）は排水槽であり、例
えばピットからポンプで排水を受け入れるようになって
いる。（２）は排水槽（１）から受け入れた排水をスク
リーンで濾過する濾過槽であり、（３）は既に公知のバ
イオリアクターである。したがって、排水中の浮遊物な
どが濾過槽（２）で濾過され、更に排水中のＢＯＤ、Ｃ
ＯＤ、ＳＳや油分などがバイオリアクター（３）中の微
生物で分解・処理され、１次処理水として限外濾過装置
（以下、ＵＦ装置と略称する）（４）へ送られる。ＵＦ
装置（４）は既に公知で、所定本数の膜モジュールを充
填したユニットとなっており、上記１次処理水を分子レ
ベルで濃縮・濾過する。In FIG. 1, (1) denotes a drainage tank, which receives drainage from a pit by a pump, for example. (2) is a filtration tank for filtering wastewater received from the drainage tank (1) by a screen, and (3) is a known bioreactor. Therefore, suspended matter and the like in the wastewater are filtered in the filtration tank (2), and BOD and C in the wastewater are further filtered.
OD, SS, oil and the like are decomposed and treated by microorganisms in the bioreactor (3) and sent to an ultrafiltration device (hereinafter abbreviated as UF device) (4) as primary treated water. UF
The device (4) is already known, and is a unit filled with a predetermined number of membrane modules, and concentrates and filters the primary treated water at a molecular level.
【０００９】ＵＦ装置（４）で濾過された２次処理水に
は未だシリカが含有しているので、その２次処理水は最
終工程である逆浸透装置（以下、ＲＯ装置と略称する）
（６）へ送られて処理される。そして、ＵＦ装置（４）
で濃縮された濃縮液は凝集沈澱槽（５）へ送られる。上
記した２次処理水はＲＯ装置（６）でシリカが除去され
て、シリカを含有しない最終処理水として回収される
が、２次処理水にシリカが高濃度に含有していると、シ
リカが膜に付着してＲＯ装置（６）の負荷を増大せし
め、清澄な最終処理水の回収率が極端に低下する。[0009] Since the secondary treatment water filtered by the UF device (4) still contains silica, the secondary treatment water is supplied to a reverse osmosis device (hereinafter abbreviated as an RO device) in the final step.
It is sent to (6) for processing. And the UF device (4)
The concentrated liquid concentrated in the step is sent to the coagulation sedimentation tank (5). Silica is removed from the above-mentioned secondary treatment water by the RO device (6) and recovered as final treatment water containing no silica. However, if the secondary treatment water contains a high concentration of silica, the silica is removed. It adheres to the membrane and increases the load on the RO device (6), and the recovery rate of clear final treated water is extremely reduced.
【００１０】そこで、ＲＯ装置（６）へ送る２次処理水
に含有するシリカの濃度をその溶解度の好ましくは１／
４以下程度に抑えるために、本発明ではＲＯ装置（６）
に送る前の処理段階において、ポリ塩化アルミニウム
（以下、ＰＡＣと略称する）等の三価の金属化合物類か
らなる薬剤を投入して、シリカを強制沈降除去するよう
にしている。（７）はその薬剤投入装置であり、ＵＦ装
置（４）に送る前のバイオリアクター（３）で処理した
１次処理水に薬剤を投入するようになっている。Therefore, the concentration of silica contained in the secondary treatment water sent to the RO device (6) is preferably set to 1/100 of its solubility.
According to the present invention, the RO device (6)
In a treatment step before sending to a PAC, an agent composed of a trivalent metal compound such as polyaluminum chloride (hereinafter abbreviated as PAC) is charged to forcibly precipitate and remove silica. Numeral (7) is a drug feeding device for feeding a drug into the primary treated water treated in the bioreactor (3) before being sent to the UF device (4).
【００１１】つまり、バイオリアクター（３）から送ら
れた１次処理水は薬剤投入装置（７）から投入されるＰ
ＡＣ、ＮａＯＨと混合してからＵＦ装置（４）で濃縮・
濾過されるようになっており、ＰＡＣ等の薬剤は、シリ
カの溶解度が常温、中性の領域でＳｉＯ2換算で約１２
０ｐｐｍ程度なので、ＵＦ装置（４）からＲＯ装置
（６）へ送られる２次処理水中のシリカがＳｉＯ2換算
で約３０ｐｐｍ程度以下になるように計算されて投入さ
れる。That is, the primary treated water sent from the bioreactor (3) is supplied to the P
After mixing with AC and NaOH, the mixture is concentrated with a UF device (4).
Chemicals such as PAC are used to filter silica at a normal temperature and neutral range of about 12 in terms of SiO 2.
Since it is about 0 ppm, the silica is calculated and supplied so that the silica in the secondary treatment water sent from the UF apparatus (4) to the RO apparatus (6) is about 30 ppm or less in terms of SiO 2 .
【００１２】一方、ＵＦ装置（４）で濃縮された濃縮液
は凝集沈澱槽（５）に送られ、凝集沈澱槽（５）内にお
いて、濃縮液中のシリカが水酸化アルミニウムと共に沈
降して分離される。そして、凝集沈澱槽（５）内の上澄
液は濾過槽（２）へ再度送られて排水と混合し、バイオ
リアクター（３）、ＵＦ装置（４）に送られて循環濃縮
・濾過されるようになっている。On the other hand, the concentrated liquid concentrated by the UF device (4) is sent to the coagulating sedimentation tank (5), where the silica in the concentrated liquid sediments together with the aluminum hydroxide and is separated. Is done. Then, the supernatant liquid in the coagulating sedimentation tank (5) is sent again to the filtration tank (2) and mixed with the wastewater, sent to the bioreactor (3) and the UF unit (4), and circulated and concentrated. It has become.
【００１３】以上を要約すると、排水槽（１）からの排
水は、まず濾過槽（２）を経てバイオリアクター（３）
で分解処理され、バイオリアクター（３）で分解処理さ
れた１次処理水は、薬剤が投入されてからＵＦ装置
（４）で濃縮・濾過され、ＵＦ装置（４）で濃縮された
濃縮液は、凝集沈澱槽（５）に送られて濃縮液中のシリ
カが分離除去された後、再度濾過槽（２）に送られると
いう連続循環濃縮・濾過が所定の時間行われ、凝集沈澱
槽（５）で分離したシリカは残液槽（９）に貯蔵され
る。To summarize the above, the wastewater from the drainage tank (1) is first passed through the filtration tank (2) and passed through the bioreactor (3).
The primary treated water decomposed by the bioreactor (3) is concentrated and filtered by the UF device (4) after the chemical is introduced, and the concentrated liquid concentrated by the UF device (4) is After being sent to the coagulation / sedimentation tank (5), the silica in the concentrated liquid is separated and removed, and then sent to the filtration tank (2) again for continuous circulation concentration / filtration for a predetermined time. The silica separated in (1) is stored in the residual liquid tank (9).
【００１４】一方、濾過槽（２）、バイオリアクター
（３）、ＵＦ装置（４）で連続循環濃縮・濾過されて、
ＳｉＯ2換算で約１５〜３０ｐｐｍ程度までシリカが分
離された２次処理水は、ＲＯ装置（６）へ送られ、ＲＯ
装置（６）で分子レベルでの濃縮・濾過が行われて、シ
リカがほとんど除去され、ＲＯ装置（６）で濾過された
最終処理水は最終処理水槽（８）に貯蔵される。なお、
ＲＯ装置（６）で分離されたシリカは残液槽（１０）に
貯蔵される。On the other hand, it is continuously circulated and concentrated in a filtration tank (2), a bioreactor (3), and a UF device (4).
The secondary treated water from which silica has been separated to about 15 to 30 ppm in terms of SiO 2 is sent to the RO device (6),
Concentration and filtration at the molecular level are performed in the device (6) to remove most of the silica, and the final treated water filtered by the RO device (6) is stored in the final treated water tank (8). In addition,
The silica separated by the RO device (6) is stored in the residual liquid tank (10).
【００１５】[0015]
【実施例】次に実際に排水を処理したデータに基づい
て、本発明になる排水の処理方法のマスバランスについ
て説明する。 ａ．排水量 ２５０ｍ3／Ｄ ｂ．排水の成分 ｐＨ ８〜９ シリカ濃度（ＳｉＯ2換算） ５０〜１００ｐｐｍ ＢＯＤ ２５０〜３００ｐｐｍ ＣＯＤ １２０〜１５０ｐｐｍ ＳＳ ５０〜１００ｐｐｍ 油分 ３０〜 ５０ｐｐｍ ｃ．１次処理水成分 ｐＨ ７〜８ シリカ濃度（ＳｉＯ2換算） ５０〜１００ｐｐｍ ＢＯＤ ３ｐｐｍ ＣＯＤ １０ｐｐｍ ＳＳ １０ｐｐｍ 油分 １ｐｐｍ ｄ．ＰＡＣ アルミナ１０％換算 １２５〜２５０ｋｇ／Ｄ ＮａＯＨ ４８％換算 ６３〜１２５ｋｇ／Ｄ ｅ．２次処理水成分 ｐＨ ７〜８ シリカ濃度（ＳｉＯ2換算） １５〜３０ｐｐｍ ＢＯＤ １ｐｐｍ ＣＯＤ ３ｐｐｍ ＳＳ １ｐｐｍ 油分 １ｐｐｍ ｆ．最終処理水成分 ｐＨ ７〜８ シリカ濃度（ＳｉＯ2換算） １ｐｐｍ ＢＯＤ １ｐｐｍ ＣＯＤ １ｐｐｍ ＳＳ １ｐｐｍ 油分 １ｐｐｍ ｇ．最終処理水量 ２００ｍ3／Ｄ ｈ．最終処理水回収率 ２００ｍ3／２５０ｍ3＝８０％Next, the mass balance of the wastewater treatment method according to the present invention will be described based on data obtained by actually treating wastewater. a. Discharge volume 250m 3 / D b. Wastewater ingredients pH 8 to 9 silica concentration (SiO 2 converted) 50~100ppm BOD 250~300ppm COD 120~150ppm SS 50~100ppm oil. 30 to 50 ppm c. Primary treatment water component pH 7 to 8 Silica concentration (SiO 2 equivalent) 50 to 100 ppm BOD 3 ppm COD 10 ppm SS 10 ppm Oil 1 ppm d. PAC alumina 10% conversion 125-250 kg / D NaOH 48% conversion 63-125 kg / D e. Secondary treatment water component pH 7 to 8 Silica concentration (SiO 2 equivalent) 15 to 30 ppm BOD 1 ppm COD 3 ppm SS 1 ppm Oil 1 ppm f. Final treated water component pH 7 to 8 Silica concentration (SiO 2 equivalent) 1 ppm BOD 1 ppm COD 1 ppm SS 1 ppm Oil 1 ppm g. Final treated water volume 200 m 3 / D h. Final treated water recovery rate 200m 3 / 250m 3 = 80%
【００１６】上記のように、ＳｉＯ2換算でシリカ濃度
が５０〜１００ｐｐｍの排水が２５０ｍ3／Ｄ発生する
施設において、濾過槽とバイオリアクターを経た１次処
理水にＰＡＣとＮａＯＨを投入してＵＦ装置で濃縮・濾
過するという連続循環濃縮・濾過によってＢＯＤやＣＯ
Ｄなどを分離した結果、ＵＦ装置で濾過された２次処理
水のシリカ濃度はＳｉＯ2換算で１５〜３０ｐｐｍとな
った。そして、更にその２次処理水をＲＯ装置で濃縮・
濾過した結果、最終処理水のシリカ濃度はＳｉＯ2換算
で１ｐｐｍまで低下し、清澄な処理水を得ることができ
た。また、その回収量は約２００ｍ3／Ｄとなり、最終
処理水回収率は８０％となった。As described above, in a facility that generates 250 m 3 / D of wastewater having a silica concentration of 50 to 100 ppm in terms of SiO 2 , PAC and NaOH are charged into the primary treated water that has passed through a filtration tank and a bioreactor to provide UF. BOD and CO by continuous circulation concentration and filtration
As a result of separating D and the like, the silica concentration of the secondary treatment water filtered by the UF device was 15 to 30 ppm in terms of SiO 2 . Then, the secondary treated water is further concentrated by an RO device.
As a result of filtration, the silica concentration of the final treated water was reduced to 1 ppm in terms of SiO 2 , and clear treated water could be obtained. The recovered amount was about 200 m 3 / D, and the final treated water recovery rate was 80%.
【００１７】なお、本実施例では投入する薬剤としてＰ
ＡＣを採用したが、薬剤はＰＡＣに限定されるものでは
なく、シリカと容易に共沈する三価の金属化合物類であ
ればよく、例えば硫酸アルミニウム、硫酸第二鉄なども
採用することができる。また、本実施例ではリネンサプ
ライ関連施設からの排水処理について説明したが、当然
ながらこれに限定されるものではなく、本発明は要する
にシリカを高濃度に含有する排水を効率よく処理してシ
リカを除去し、その処理水を回収して再活用するために
なされたものである。In this embodiment, the medicine to be injected is P
Although AC was employed, the drug is not limited to PAC, but may be any trivalent metal compound that easily co-precipitates with silica, such as aluminum sulfate and ferric sulfate. . In this embodiment, the treatment of wastewater from linen supply-related facilities has been described. However, the present invention is not limited to this. Naturally, the present invention efficiently treats wastewater containing silica at a high concentration to reduce silica. It was done to remove, collect and reuse the treated water.
【００１８】[0018]
【発明の効果】本発明になる排水の処理方法によれば、
高濃度にシリカを含有する排水をバイオリアクターと限
外濾過装置で循環濃縮・濾過するとともに、ポリ塩化ア
ルミニウムを初めとする三価の金属化合物類を投入して
排水中のシリカを予め除去した後に、逆浸透装置で濃縮
・濾過するので、逆浸透装置の負荷を軽減できるととも
に、シリカ分の低い清澄水を効率よく得ることができ
る。とりわけ、高濃度にシリカを含有する排水が大量に
発生し、これら排水を効率よく処理して、シリカの含有
率が低い清澄水を回収して再活用するような施設での排
水処理には好適な処理方法であり、環境問題からはもち
ろん、経済的にもメリットは大きく、当業界に及ぼす効
果には著しいものがある。According to the wastewater treatment method of the present invention,
After circulating and filtering wastewater containing silica at high concentration in a bioreactor and an ultrafiltration device, and removing trivalent metal compounds such as polyaluminum chloride to remove silica in the wastewater in advance, Since the concentration and filtration are performed by the reverse osmosis device, the load on the reverse osmosis device can be reduced, and clear water having a low silica content can be efficiently obtained. Particularly, it is suitable for wastewater treatment in a facility that generates a large amount of wastewater containing silica at a high concentration, efficiently treats the wastewater, and recovers and reuses clear water having a low silica content. It is a very effective treatment method, has great economical benefits as well as environmental issues, and has significant effects on the industry.
【図１】本発明になる排水の処理方法の全体概要図FIG. 1 is an overall schematic diagram of a wastewater treatment method according to the present invention.
１ 排水槽 ２ 濾過槽 ３ バイオリアクター ４ 限外濾過装置（ＵＦ装置） ５ 凝集沈澱槽 ６ 逆浸透装置（ＲＯ装置） ７ 薬剤投入装置 ８ 最終処理水槽 ９ 残液槽 １０ 残液槽 DESCRIPTION OF SYMBOLS 1 Drain tank 2 Filtration tank 3 Bioreactor 4 Ultrafiltration apparatus (UF apparatus) 5 Coagulation sedimentation tank 6 Reverse osmosis apparatus (RO apparatus) 7 Drug injection apparatus 8 Final treatment water tank 9 Residual liquid tank 10 Residual liquid tank
フロントページの続き Ｆターム(参考） 4D006 GA03 GA06 KA01 KA33 KA41 KA52 KA55 KA57 KB13 KB14 KB21 KD08 KE01Q KE02P KE12P KE13P KE15P PA01 PB08 PB23 4D015 BA04 BB05 CA02 DA04 DA05 DA15 EA14 EA37 FA15 FA17 FA26 4D062 BA04 BB05 CA02 DA04 DA05 DA15 EA14 EA37 FA15 FA17 FA26 Continued on the front page F-term (reference) 4D006 GA03 GA06 KA01 KA33 KA41 KA52 KA55 KA57 KB13 KB14 KB21 KD08 KE01Q KE02P KE12P KE13P KE15P PA01 PB08 PB23 4D015 BA04 BB05 CA02 DA04 DA05 DA15 EA14 EA37 DA15 FA17 EA37 FA15 FA17 FA26
Claims (1)
リアクターで分解処理した処理水に、三価の金属化合物
類を投入してから限外濾過装置で濃縮・濾過し、限外濾
過装置で濃縮した濃縮液を凝集沈殿槽でシリカを分離し
ながら再度排水と混合して循環させ、限外濾過装置で濾
過した処理水を逆浸透装置で濃縮・濾過することを特徴
とする排水の処理方法。1. A trivalent metal compound is added to treated water obtained by decomposing wastewater containing silica at a high concentration in a bioreactor, and then concentrated and filtered by an ultrafiltration device. A method for treating wastewater, comprising mixing the concentrated liquid concentrate with wastewater again while separating silica in a coagulation sedimentation tank and circulating, and concentrating and filtering the treated water filtered by an ultrafiltration device with a reverse osmosis device. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11220600A JP2001038353A (en) | 1999-08-04 | 1999-08-04 | Treatment of wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11220600A JP2001038353A (en) | 1999-08-04 | 1999-08-04 | Treatment of wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001038353A true JP2001038353A (en) | 2001-02-13 |
Family
ID=16753528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11220600A Withdrawn JP2001038353A (en) | 1999-08-04 | 1999-08-04 | Treatment of wastewater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001038353A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002273462A (en) * | 2001-03-22 | 2002-09-24 | Asahi Kasei Corp | Method and device for treating waste water |
| CN102689999A (en) * | 2012-04-25 | 2012-09-26 | 浙江省海洋开发研究院 | Resourceful treatment method for silica gel waste water |
| JP2017113707A (en) * | 2015-12-24 | 2017-06-29 | 日之出産業株式会社 | Waste liquid treatment method and waste liquid treatment system |
-
1999
- 1999-08-04 JP JP11220600A patent/JP2001038353A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002273462A (en) * | 2001-03-22 | 2002-09-24 | Asahi Kasei Corp | Method and device for treating waste water |
| CN102689999A (en) * | 2012-04-25 | 2012-09-26 | 浙江省海洋开发研究院 | Resourceful treatment method for silica gel waste water |
| JP2017113707A (en) * | 2015-12-24 | 2017-06-29 | 日之出産業株式会社 | Waste liquid treatment method and waste liquid treatment system |
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| A300 | Withdrawal of application because of no request for examination |
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