JPS6115722B2 - - Google Patents
Info
- Publication number
- JPS6115722B2 JPS6115722B2 JP1062782A JP1062782A JPS6115722B2 JP S6115722 B2 JPS6115722 B2 JP S6115722B2 JP 1062782 A JP1062782 A JP 1062782A JP 1062782 A JP1062782 A JP 1062782A JP S6115722 B2 JPS6115722 B2 JP S6115722B2
- Authority
- JP
- Japan
- Prior art keywords
- sedimentation
- ultrasonic waves
- algae
- zone
- plate
- 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.)
- Expired
Links
- 238000004062 sedimentation Methods 0.000 claims description 52
- 241000195493 Cryptophyta Species 0.000 claims description 20
- 239000010865 sewage Substances 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000010802 sludge Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 241000195628 Chlorophyta Species 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 210000000170 cell membrane Anatomy 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 235000002597 Solanum melongena Nutrition 0.000 description 1
- 244000061458 Solanum melongena Species 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 210000003495 flagella Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Physical Water Treatments (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は下水処理に於て周波数の異なる二種の
超音波を用いて沈殿槽の沈降促進板等への藻の発
生及びその付着を防止する方法に関するものであ
る。[Detailed Description of the Invention] Industrial Application Field The present invention is a method for preventing the growth of algae and their adhesion to sedimentation accelerator plates, etc. of a sedimentation tank using two types of ultrasonic waves with different frequencies in sewage treatment. It is related to.
従来の技術とその問題点
従来下水処理に於て沈殿槽が用いられるが、こ
の沈殿槽には流入汚水中の汚泥等の有機、無機の
固定物を効率的に沈降除去するため即ち沈殿効率
向上のため沈降促進板が設置される。Conventional technology and its problems Sedimentation tanks are conventionally used in sewage treatment, but in order to efficiently settle and remove organic and inorganic fixed substances such as sludge in inflowing sewage, this sedimentation tank has a method of improving sedimentation efficiency. Therefore, sedimentation accelerating plates will be installed.
しかしこの沈降促進板を用いて下水の処理を行
う時、沈殿除去する対象が生物汚泥のために沈降
促進板への付着ひいては剥離浮上といつた問題が
生じ、とりわけ藻の発生、付着がこの現象を大い
に助長するものとなり、藻が一旦発生し、沈降促
進板に付着するとその除去が非常に困難となると
共に煩雑な維持管理作業を要する等の欠点があ
る。 However, when treating sewage using this sedimentation accelerating plate, since the target to be sedimented and removed is biological sludge, problems arise such as adhesion to the sedimentation accelerating plate and eventually peeling and floating. Once algae grows and adheres to the sedimentation promotion plate, it becomes very difficult to remove it and requires complicated maintenance work.
またこの藻の発生付着によりこれに汚泥の付着
が生じ水質の悪化即ち汚泥処理が著しく損なわれ
るものとなる。 Moreover, the growth and adhesion of this algae causes sludge to adhere thereto, resulting in deterioration of water quality, that is, a significant impairment of sludge treatment.
下水処理にあたつて用いられる沈殿槽の沈降促
進板に付着し、その効率を低下せしめる藻のう
ち、問題となるのは主に緑藻である。この緑藻の
多くは無性生殖を行なつて増殖することは周知で
ある。そしてこれは普通遊走子形成によるものが
多い、この遊走子は植物細胞であつても細胞壁が
なく原形質膜だけである。又超音波によつて生じ
るキヤビテーシヨン作用があるが、これは物理的
作用としての洗浄作用と化学的作用としての過酸
化水素（H2O2）の生成とがある。そしてこの洗浄
作用は20KHz〜30KHzの比較的周波数の低い方が
減衰も少く効率が良くまた過酸化水素は強い酸化
力を有し、微生物の原形質膜と直接化合して殺菌
作用を有するが、この過酸化水素の発生は300〜
500KHzの比較的周波数の高い方が効率が良い。 Among the algae that adhere to the sedimentation accelerator plates of sedimentation tanks used in sewage treatment and reduce their efficiency, green algae are mainly problematic. It is well known that many of these green algae reproduce asexually. This is usually due to the formation of zoospores, and even in plant cells, zoospores do not have a cell wall and only have a plasma membrane. There is also a cavitation effect caused by ultrasonic waves, which includes a cleaning effect as a physical effect and the production of hydrogen peroxide (H 2 O 2 ) as a chemical effect. This cleaning action is more efficient with less attenuation at a relatively low frequency of 20KHz to 30KHz, and hydrogen peroxide has strong oxidizing power and has a bactericidal effect by directly combining with the plasma membrane of microorganisms. The generation of this hydrogen peroxide is 300~
The relatively high frequency of 500KHz is more efficient.
問題点の解決手段
沈降促進板を設けた沈降ゾーンの流入口にて比
較的周波数の高い超音波を流入汚水に対して照射
し次いで、沈降ゾーン及び沈降ゾーン流出側にて
比較的周波数の低い超音波を沈降促進板に向つて
照射し、之等周波数の異なる二種の超音波にて沈
降促進板等への藻の発生及びその付着を未然に防
止するようになす。Solution to the problem: Ultrasonic waves of a relatively high frequency are irradiated to the inflowing wastewater at the inlet of the settling zone provided with a sedimentation promoting plate, and then ultrasonic waves of a relatively low frequency are irradiated to the settling zone and the outflow side of the settling zone. Sound waves are irradiated toward the sedimentation accelerating plate, and two types of ultrasonic waves having different frequencies are used to prevent algae from growing and adhering to the sedimentation accelerating plate.
実施例
以下本発明を図示の一実施例に基づいて説明す
る。Embodiment The present invention will be described below based on an illustrated embodiment.
図に於て１は下水処理の沈殿槽で、この一端に
原水を流入する流入口２、他端に処理後の汚水を
排出する流出口３を設けると共にその内部には沈
降促進板４を設ける。図示の実施例では該促進板
を傾斜せしめているが、水平であつてもよい。そ
して汚水原水の流入口又はこの近くに沈降促進板
を設けた沈降ゾーンと流入ゾーンとを分ける仕切
板５を設け、流入口より流入された原水は流入ゾ
ーンより沈降ゾーンの下方より流出するようにな
す。また沈降促進板を設置した沈殿槽において沈
殿ゾーンの流入口に比較的周波数の高い超音波を
発生する発生装置６を超音波が流入汚水に対して
照射するようにして設置する。そして沈殿ゾーン
および沈殿ゾーン流出側において比較的周波数の
低い超音波を発生する発生装置７を超音波が沈降
促進板に向けて照射するようにして設置する。こ
れらの発生装置６，７は固定でも又移動させても
よい。または、周波数可変の発生装置を沈殿ゾー
ンに対し、自在に移動させてもよい。 In the figure, 1 is a sedimentation tank for sewage treatment, with an inlet 2 at one end for raw water to flow in, and an outlet 3 for discharging treated wastewater at the other end, and a sedimentation promoting plate 4 inside. . In the illustrated embodiment, the promoting plate is inclined, but it may be horizontal. A partition plate 5 is provided at or near the inlet of raw sewage water to separate the sedimentation zone and the inflow zone, which are provided with a sedimentation promoting plate, so that the raw water flowing in from the inlet flows out from the lower part of the sedimentation zone than the inflow zone. Eggplant. Further, in a sedimentation tank equipped with a sedimentation promoting plate, a generator 6 for generating relatively high frequency ultrasonic waves is installed at the inlet of the sedimentation zone so that the ultrasonic waves irradiate the inflowing wastewater. A generator 7 that generates ultrasonic waves with a relatively low frequency is installed in the precipitation zone and on the outflow side of the precipitation zone so that the ultrasonic waves are directed toward the sedimentation promoting plate. These generators 6, 7 may be fixed or movable. Alternatively, a variable frequency generator may be moved freely relative to the precipitation zone.
従つて上述の如く構成する沈殿槽へ原水をその
流入口より供給せしめると流入ゾーンでここに設
置された超音波発生装置６にて300〜500KHzの比
較的周波数の高い超音波数の高い超音波が流入汚
水に向つて照射されるため流入ゾーンより沈降ゾ
ーンへ流入しようとする胞子の一種で鞭毛を有し
て遊泳する遊走子を該超音波にて発生する過酸化
水素による殺菌作用にて除去される。そしてこの
過酸化水素の影響から逃れた遊走子は沈降ゾーン
へ流入され沈降促進板に付着する。この沈降促進
板に着床し、発芽して遊走子が増殖され藻が発生
する段階で、沈降ゾーンに設けられた超音波発生
装置７にて20〜30KHzの比較的周波数の低い超音
波を沈降促進板に向つて照射することによりこれ
にて生じたキヤビテーシヨンによる洗浄作用で付
着藻を沈降促進板より除去するものである。 Therefore, when raw water is supplied from the inlet to the sedimentation tank configured as described above, the ultrasonic generator 6 installed here in the inflow zone generates ultrasonic waves with a relatively high frequency of 300 to 500 KHz and a high number of ultrasonic waves. is irradiated toward the inflowing wastewater, so the zoospores, which are a type of spores that swim with flagella and try to flow from the inflow zone to the sedimentation zone, are removed by the sterilization effect of hydrogen peroxide generated by the ultrasonic waves. be done. The zoospores that escape from the influence of hydrogen peroxide flow into the sedimentation zone and adhere to the sedimentation promotion plate. At the stage when algae settles on this sedimentation promotion plate, germinates, proliferates zoospores, and generates algae, the ultrasonic generator 7 installed in the sedimentation zone emits ultrasonic waves with a relatively low frequency of 20 to 30 KHz to cause sedimentation. The adhering algae are removed from the sedimentation promotion plate by the cleaning action caused by the cavitation generated by irradiation toward the promotion plate.
この超音波発生装置７による超音波の照射は沈
降促進板に藻の付着が生じ始めた頃に行なうが、
常時照射するようにしてもよい。 The ultrasonic irradiation by the ultrasonic generator 7 is carried out when algae start to adhere to the sedimentation promoting plate.
It may be irradiated constantly.
発明の効果
而して本発明による時は沈殿ゾーンの入口部分
で、周波数の高い超音波を流入汚水に照射するこ
とで、沈降促進板に発生する藻、とりわけ、緑藻
の発生源となる遊走子の沈殿ゾーンへの流入を未
然に防ぐと同時に沈殿ゾーンに流入する前の微粒
子の凝集を促し、沈殿効率を向上させるという効
果をも合わせもつと共に沈殿ゾーンでは周波数の
低い超音波を沈降促進板に向けて照射することで
沈殿ゾーン入口で、除外し損ねた遊走子がもとで
発生した藻及び付着汚泥をも除去することができ
る。この周波数の高いものと低いものとの二種の
超音波を二段構えにて照射することにより完全に
沈降促進板への藻の発生、付着を防止することが
でき、沈殿効率が高く、かつ、維持管理上の問題
の少い沈殿槽を提供することができる等の利点を
有する。Effects of the Invention According to the present invention, by irradiating the inflowing wastewater with high-frequency ultrasonic waves at the entrance of the sedimentation zone, algae, especially zoospores, which are the source of green algae, are generated on the sedimentation promoting plate. It has the effect of preventing particles from flowing into the sedimentation zone, and at the same time promoting agglomeration of fine particles before they flow into the sedimentation zone, improving sedimentation efficiency. By directing the irradiation, it is possible to remove algae and attached sludge generated by zoospores that were not removed at the entrance of the sedimentation zone. By irradiating these two types of ultrasonic waves with high and low frequencies in two stages, it is possible to completely prevent algae from growing and adhering to the sedimentation promotion plate, resulting in high sedimentation efficiency and , it has the advantage of being able to provide a sedimentation tank with fewer maintenance problems.
なお、構成の中で、発生装置を移動させてもよ
いとしたのは、特にキヤビテーシヨンによる洗浄
作用を目的とする超音波の場合、常時、沈降促進
板に照射しておく必要はない。第４図に示すよう
に実際の下水処理場の最終沈殿池で実験を行なつ
た結果、比較的周波数の高い超音波を照射した
後、放置して藻の発生した板に超音波（周波数
28KHz、音波出力0.9W／cm2）を７分照射すると
藻を除去できることが確認された。 In addition, the reason why the generator may be moved in the configuration is that especially in the case of ultrasonic waves whose purpose is to cleanse by cavitation, it is not necessary to always irradiate the sedimentation promoting plate. As shown in Figure 4, as a result of an experiment conducted in the final settling tank of an actual sewage treatment plant, after irradiating relatively high-frequency ultrasonic waves, the plates on which algae had grown were left to stand.
It was confirmed that algae can be removed by irradiation with 28KHz, sound wave output of 0.9W/cm 2 for 7 minutes.
第４図に示すグラフはＸ日間放置時の藻の累積
付着量を実線で示し、このＸ日間放置して藻が付
着した時、７分間超音波を照射した場合、超音波
照射にて藻の付着低減量即ち残存付着量をＯ印で
示した。従て該図から明白なように放置後超音波
照射にて藻の残存付着量は４日目が一番少いこと
が判る。これから４日間放置後超音波を７分間照
射すれば付着藻の除去を効果的に行える。 The graph shown in Figure 4 shows the cumulative amount of algae attached after being left for X days as a solid line. The amount of adhesion reduction, ie, the amount of remaining adhesion, is indicated by O. Therefore, as is clear from the figure, the amount of residual algae adhesion is the lowest on the 4th day after being left to stand and irradiated with ultrasonic waves. If left for 4 days and then irradiated with ultrasonic waves for 7 minutes, the attached algae can be effectively removed.
第１図は縦断側面図、第２図は第１図Ａ−Ａ線
による断面図、第３図は同Ｂ−Ｂ線による断面
図、第４図は本発明による藻の除去効果を示すグ
ラフ図である。
１……沈殿槽、２……流入口、３……流出口、
４……沈降促進板、５……仕切板、６，７……超
音波発生装置。
Fig. 1 is a longitudinal side view, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a sectional view taken along line B-B in Fig. 1, and Fig. 4 is a graph showing the algae removal effect of the present invention. It is a diagram. 1... Sedimentation tank, 2... Inlet, 3... Outlet,
4... Sedimentation promotion plate, 5... Partition plate, 6, 7... Ultrasonic generator.
Claims (1)
て沈降促進板を設けた沈降ゾーンの流入口にて比
較的周波数の高い超音波を流入汚水に対して照射
し次いで、沈降ゾーン及び沈降ゾーン流出側にて
比較的周波数の低い超音波を沈降促進板に向つて
照射し、之等周波数の異なる二種の超音波にて沈
降促進板等への藻の発生及びその付着を未然に防
止するようになしたことを特徴とする下水処理に
おける藻の発生及び付着防止方法。1. In a sedimentation tank equipped with a sedimentation accelerating plate for sewage treatment, ultrasonic waves of a relatively high frequency are irradiated to the inflowing wastewater at the inlet of the sedimentation zone equipped with the sedimentation accelerating plate, and then the sedimentation zone and the sedimentation zone are On the outflow side, ultrasonic waves with a relatively low frequency are irradiated toward the sedimentation accelerating plate, and two types of ultrasonic waves with different frequencies are used to prevent algae from growing and adhering to the sedimentation accelerating plate, etc. A method for preventing the growth and adhesion of algae in sewage treatment, characterized by the following:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1062782A JPS58128113A (en) | 1982-01-25 | 1982-01-25 | Preventing method of generation and sticking of algae in sewage treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1062782A JPS58128113A (en) | 1982-01-25 | 1982-01-25 | Preventing method of generation and sticking of algae in sewage treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58128113A JPS58128113A (en) | 1983-07-30 |
| JPS6115722B2 true JPS6115722B2 (en) | 1986-04-25 |
Family
ID=11755448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1062782A Granted JPS58128113A (en) | 1982-01-25 | 1982-01-25 | Preventing method of generation and sticking of algae in sewage treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58128113A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109911995A (en) * | 2019-03-04 | 2019-06-21 | 河海大学 | A method for recycling cyanobacteria with both algal toxin removal and high-efficiency dehydration of algal fluid |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1010407A4 (en) | 1996-07-04 | 1998-07-07 | Undatim Ultrasonics | Method and installation of water treatment. |
| BE1012254A6 (en) * | 1998-10-28 | 2000-08-01 | Thomas Hilaire Fernand Achille | METHOD AND DEVICE FOR TREATING WATER IN A SWIMMING POOL, POOL THAT IS EQUIPPED WITH SUCH DEVICE, AND transducer. |
| EP1562642B1 (en) | 2002-11-04 | 2007-01-10 | Ashland Inc. | Device and process for treating a liquid medium using ultrasound in preventing the growth of hyperproliferative or infected cells |
| US7048863B2 (en) | 2003-07-08 | 2006-05-23 | Ashland Licensing And Intellectual Property Llc | Device and process for treating cutting fluids using ultrasound |
| WO2006038926A1 (en) | 2004-06-23 | 2006-04-13 | Ashland Licensing And Intellectual Property Llc | Devices and methods for treating fluids utilized in electrocoating processes with ultrasound |
| ES2440778T3 (en) | 2004-11-17 | 2014-01-30 | Ashland Licensing And Intellectual Property Llc | Method for treating refrigerant fluids used in tire manufacturing |
| JP2007289880A (en) * | 2006-04-26 | 2007-11-08 | Contig I:Kk | Ultrasonic sterilizer and circulating bath water purifier equipped with the same |
| JP5572538B2 (en) * | 2010-12-27 | 2014-08-13 | 株式会社Ｉｈｉ | Biofouling prevention method, biofouling prevention device, and gate device |
| CN102344184A (en) * | 2011-07-15 | 2012-02-08 | 水利部南京水利水文自动化研究所 | Multi-frequency supersonic wave algae removing equipment |
| JP5842710B2 (en) * | 2012-03-30 | 2016-01-13 | 栗田工業株式会社 | Wastewater treatment apparatus and method |
| CN102963957B (en) * | 2012-11-26 | 2013-09-25 | 河北大学 | Method for determining optimal frequency in processing organic matter through ultrasonic wave |
| DE102013209282A1 (en) | 2013-05-21 | 2014-11-27 | Krones Ag | Sedimentation device for separating a material mixture and method for removing sediment from a sedimentation device |
| CN103787526A (en) * | 2014-01-16 | 2014-05-14 | 同济大学 | Method for removing blue-green algae by using microbubble hydrodynamic cavitation enhanced coagulation |
-
1982
- 1982-01-25 JP JP1062782A patent/JPS58128113A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109911995A (en) * | 2019-03-04 | 2019-06-21 | 河海大学 | A method for recycling cyanobacteria with both algal toxin removal and high-efficiency dehydration of algal fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58128113A (en) | 1983-07-30 |
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