JP2561317B2 - Septic tank - Google Patents
Septic tankInfo
- Publication number
- JP2561317B2 JP2561317B2 JP63111516A JP11151688A JP2561317B2 JP 2561317 B2 JP2561317 B2 JP 2561317B2 JP 63111516 A JP63111516 A JP 63111516A JP 11151688 A JP11151688 A JP 11151688A JP 2561317 B2 JP2561317 B2 JP 2561317B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- aeration
- aeration tank
- sewage
- advection
- 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 - Fee Related
Links
Landscapes
- Treatment Of Biological Wastes In General (AREA)
Description
この発明は、住宅や小規模建築物などからの汚水を処
理するに好適な浄化槽に関するものである。The present invention relates to a septic tank suitable for treating sewage from a house or a small building.
従来のこの種の浄化槽は、貯留槽と接触ばっ気槽と沈
殿槽の組合せか、あるいは貯留槽と浮遊ばっ気槽と沈殿
槽の組合せが一般的であって、このような浄化槽によ
り、住宅や小規模建築物などから排出される汚水を処理
している。This type of conventional septic tank is generally a combination of a storage tank and a contact aeration tank and a precipitation tank, or a combination of a storage tank, a floating aeration tank and a precipitation tank. Treats sewage discharged from small buildings.
【発明が解決しようとする課題】 しかしながら、住宅や小規模建築物などからの汚水
は、流量変動が大きく、しかも間歇的に排出されるた
め、従来の接触ばっ気または浮遊ばっ気による浄化槽で
は放流水質が極めて不安定である。 即ち、従来の接触ばっ気法による浄化槽では、接触濾
材に微生物が膜として固着し、遊離し難いため、汚水流
量の変動に対して強いが、汚水中の有機物と微生物との
接触機能は浮遊ばっ気の場合に比して劣るため、大容積
の接触濾材が必要となるという問題点があった。 また、浮遊ばっ気による浄化槽の場合は、生物密度を
濃くすれば、汚水有機物の分解速度は増大するが、汚水
流入量が多く且つそれに伴う処理水排出量が多いとき、
処理途中で生物（SS）が次に沈殿槽に押し流され、浮遊
ばっ気槽内における生物密度（MLSS）を高濃度に維持で
きなくなるという問題点があった。 この発明は上記のような問題点を解消するためになさ
れたもので、汚水が間歇的に流入し且つ汚水流入量が変
動しても、その汚水を効率よく処理することができ、安
定した良質の清澄水を放流することができると共に、脱
窒・脱リンをも効率よく行うことができる浄化槽を提供
することを目的とする。However, since sewage from a house or a small building has a large flow rate fluctuation and is discharged intermittently, it is discharged in a conventional septic tank using contact aeration or floating aeration. Water quality is extremely unstable. That is, in a conventional septic tank using the contact aeration method, microorganisms adhere to the contact filter medium as a film and are difficult to be released, so it is strong against fluctuations in the wastewater flow rate, but the contact function between organic matter and microorganisms in the wastewater is floating. Since it is inferior to that in the case of using air, there is a problem that a large-volume contact filter medium is required. Further, in the case of a septic tank using floating aeration, if the organism density is increased, the decomposition rate of sewage organic matter increases, but when the inflow of sewage is large and the amount of treated water discharged with it is large,
There was a problem that organisms (SS) were washed away into the sedimentation tank during the treatment, and the organism density (MLSS) in the floating aeration tank could not be maintained at a high concentration. The present invention has been made to solve the above problems, and even if sewage intermittently flows in and the inflow amount of sewage fluctuates, the sewage can be efficiently treated, and stable and high quality. It is an object of the present invention to provide a septic tank which can discharge the clear water and can efficiently perform denitrification and dephosphorization.
この発明に係る浄化槽は、汚水が間歇的に流入し且つ
流入汚水量に変動がある浄化槽を対象とし、上記汚水を
受け入れ間歇ばっ気処理を行う第１ばっ気槽と、この第
１ばっ気槽から混合液を移流される第２ばっ気槽と、こ
の第２ばっ気槽から混合液を流入させて上澄液を放流す
る沈殿槽との組合せから成り、汚水の非流入時に上記第
２ばっ気槽でのばっ気による該槽内液面の盛り上がり脈
動によって、その第２ばっ気槽内の浮遊微生物を上記第
１ばっ気槽内に返送するようにしたものである。 また、第２ばっ気槽のばっ気位置は、第１ばっ気槽と
第２ばっ気槽とを連通する移流孔のほぼ直下にすること
が、後述する理由によって効果的である。 さらに、沈殿槽の上澄液は、第１ばっ気槽の汚水流入
量１日分を均等に均した定量排出ポンプで消毒槽に移流
させ、この消毒槽から消毒後の清澄水を放流させること
が一層効果的である。The septic tank according to the present invention is intended for a septic tank in which sewage intermittently flows in and the inflowing sewage amount varies, and a first aeration tank that receives the sewage and performs an intermittent aeration process, and the first aeration tank. It consists of a second aeration tank to which the mixed liquid is admitted from the second aeration tank, and a settling tank to which the mixed liquid is introduced from the second aeration tank and the supernatant liquid is discharged. The floating microorganisms in the second aeration tank are returned to the first aeration tank by the rising pulsation of the liquid level in the tank due to the aeration in the air tank. Further, it is effective that the aeration position of the second aeration tank is substantially directly below the advection hole that connects the first aeration tank and the second aeration tank to each other for the reason described later. In addition, the supernatant of the sedimentation tank should be transferred to the disinfection tank by a constant-volume discharge pump that evenly equalizes the amount of inflowing sewage in the first aeration tank for one day, and the clear water after disinfection should be discharged from this disinfection tank. Is more effective.
この発明における浄化槽は、汚水が間歇的に流入し且
つ流入汚水量が変動しても、汚水の非流入時には、第２
ばっ気槽でのばっ気によって該槽内液面が盛り上がり脈
動し、この脈動によって、第２ばっ気槽の浮遊微生物が
第１ばっ気槽に返送される。もって、汚水の間歇流入時
に第１ばっ気槽内の微生物が第２ばっ気槽に移流して
も、その微生物は汚水の流入がない時、上述のように第
１ばっ気槽へ自動的に戻されることとなり、第１ばっ気
槽の微生物（SS）濃度が低下するようなことはない。む
しろ、第２ばっ気槽の接触濾材から剥離した浮遊微生物
も第１ばっ気槽に移流してくるので、第１ばっ気槽内の
微生物密度（MLSS）は増加する。さらに、流入汚水量が
大きく変動しても、沈殿槽からの排出を定量排出ポンプ
で１日の平均汚水量に絞られているため、水位変動によ
る受容容量が対応して過大な流入ショックも緩和する。
従って、第１ばっ気槽内を常時高濃度に維持でき、この
状態での第１ばっ気槽の間歇ばっ気によって硝化と脱窒
反応が促進し、効果的な脱窒が行われる。また、同時に
脱リンも行われる。 また、第１ばっ気槽と第２ばっ気槽とを連通する移流
孔のほぼ直下に第２ばっ気槽の散気装置を位置させたこ
とにより、汚水の非流入時には第２ばっ気槽のばっ気に
より上記移流孔の近傍で液面を盛り上がり脈動させるこ
とができ、これによって第２ばっ気槽の浮遊微生物を第
１ばっ気槽に円滑に返送させることができる。 さらに、沈殿槽の上澄液が、第１ばっ気槽の汚水流入
量の変化を均等に均した定量排出ポンプによって消毒槽
に移流されので、この消毒槽から消毒後の清澄水を平均
流量で放流させることができる。In the septic tank according to the present invention, even if the wastewater intermittently flows in and the inflowing wastewater amount fluctuates, the second
Due to the aeration in the aeration tank, the liquid level in the tank rises and pulsates, and the floating microorganisms in the second aeration tank are returned to the first aeration tank by this pulsation. Therefore, even if the microorganisms in the first aeration tank are transferred to the second aeration tank during the intermittent inflow of sewage, the microorganisms are automatically transferred to the first aeration tank as described above when there is no inflow of sewage. It will be returned, and the concentration of microorganisms (SS) in the first aeration tank will not decrease. Rather, the floating microorganisms separated from the contact filter medium of the second aeration tank are also advected to the first aeration tank, so that the microorganism density (MLSS) in the first aeration tank increases. Furthermore, even if there is a large change in the amount of inflowing wastewater, the discharge from the settling tank is limited to the average daily amount of wastewater by the quantitative discharge pump, so the capacity that can be accommodated by fluctuations in the water level is correspondingly mitigated from excessive shocks. To do.
Therefore, the inside of the first aeration tank can be constantly maintained at a high concentration, and the intermittent aeration of the first aeration tank in this state promotes nitrification and denitrification reaction, and effective denitrification is performed. At the same time, dephosphorization is also performed. In addition, since the air diffuser of the second aeration tank is located almost directly below the advection hole that connects the first aeration tank and the second aeration tank, the second aeration tank can be operated when sewage does not flow. Due to the aeration, the liquid surface can be raised and pulsated in the vicinity of the advection hole, whereby the floating microorganisms in the second aeration tank can be smoothly returned to the first aeration tank. Furthermore, the supernatant of the settling tank is transferred to the disinfecting tank by the quantitative discharge pump that evenly equalizes the change in the amount of sewage inflow in the first aeration tank. Can be released.
以下、この発明の一実施例を図面に基づいて説明す
る。第１図および第２図において、１は単一の浄化槽で
あり、この浄化槽１内には、流入管２からの流入汚水を
受け入れて嫌気性処理を行う夾雑物貯留槽（以下、貯留
槽という）３と、この貯留槽３から移流する汚水を受け
入れ間歇ばっ気処理を行う第１ばっ気槽４と、この第１
ばっ気槽４から移流する混合液を接触ばっ気処理するた
めの第２ばっ気槽５と、この第２ばっ気槽５内で接触ば
っ気処理された混合液を流入させる沈殿槽６とがそれぞ
れが区分形成されている。 ７は上記貯留槽２内に収納配置された嫌気性濾過材、
８は上記貯留槽２内における嫌気性濾過材７下部の汚水
を上記第１ばっ気槽３の底部側に移流させるバッフルを
兼ねた移流管、９は第１ばっ気槽４内における上記移流
管８の下端側近傍に配置された散気装置、10は上記第１
ばっ気槽４と第２ばっ気槽５とを連通する移流孔であ
り、この移流孔10は第１ばっ気槽４内に設けられた移流
バッフル11によって囲繞されている。 12は上記移流孔10の上縁部に連設されて第２ばっ気槽
５内の斜め下方に突出し、この第２ばっ気槽５内の浮遊
微生物（SS）を上記移流孔10から上記第１ばっ気槽４内
に返送促進させるためのSS返送促進笠である。 13は第２ばっ気槽５に収納配置された好気性接触濾
材、14は第２ばっ気槽５の底部側に配置された散気装置
であり、この散気装置14は上記SS返送促進笠12のほぼ直
下に位置づけされている。そして、上記SS返送促進笠12
と散気装置14との間には、ばっ気上昇移流管15が配置さ
れている。 6aは沈殿槽６の傾斜壁であり、この傾斜壁6aは上記沈
殿槽６内での分離汚泥を沈降促進させて上記第２ばっ気
槽５の底部側に重力沈降返送させる。 16は上記沈殿槽６の上部側に設けられ、この沈殿槽６
の上澄液を流入させるポンプ室、17はこのポンプ室16内
に配置された定量排出ポンプであり、この定量排出ポン
プ17によって、上記ポンプ室16内に流入した上澄液を、
上記沈殿槽６の上部側に区分形成された消毒槽18内に移
流させるようにしている。ここで、上記定量排出ポンプ
17は、貯留槽３の汚水流入量をほぼ平均した流量分の上
澄液を上記消毒槽15内に移流させる。 従って、上記消毒槽18からは消毒された清澄液が上記
汚水流入量分だけ平均的に放流される。なお、上記定量
排出ポンプ17のの詳細な構成については実公昭58−4398
8号に開示されている。19は薬剤筒である。 次に動作について説明する。貯留槽３内に流入管２か
ら流入した汚水は下向流となって嫌気性濾過材７を通過
することにより、粗大固形物を分離し、移流管８を通っ
て第１ばっ気槽４内に移流する。第１ばっ気槽４内で
は、散気装置９によって間歇ばっ気処理される。これに
より、硝化反応と脱窒反応が起こり脱窒が行われる。ま
た、同時に脱リンも行われる。そして、汚水が流入する
と、SSを含んだばっ気混合液が移流バッフル11内を上昇
して移流孔10から第２ばっ気槽５内に移流する。第２ば
っ気槽５内では、散気装置14のばっ気による混合液がば
っ気上昇移流管15を上昇した後、好気性接触濾材13を下
向流で通過することにより、所謂接触ばっ気処理が行わ
れる。次いで、そのばっ気混合液は沈殿槽６内に流入
し、ここで、汚泥は傾斜壁6aに沿って第２ばっ気槽５内
の底部側に沈降返送され、且つ上澄液はポンプ室16内に
流入することにより、定量排出ポンプ17で１日の汚水流
入量を平均に均した流量で消毒槽18内に移流される。 したがって、１時的に過大な汚水流入量があっても沈
殿槽６からの排出が制限されるため、第１ばっ気槽4,第
２ばっ気槽5,沈殿槽６の液面水位は上昇し、各槽の有効
容積は膨脹した結果となり、各槽の処理滞留時間も確保
され、短略移流も防がれる。 そして、平均化して微少流量の処理水が上記消毒槽18
内で消毒され、系外に放流される。 以上の汚水処理サイクルは、貯留槽３内に汚水がピー
ク流量で流入している場合であり、その汚水流入が中断
すると、第１ばっ気槽４から第２ばっ気槽５への移流が
微少量となり、移流バッフル11内はほぼ静止状態とな
る。第２ばっ気槽５内においては、散気装置14によるば
っ気が継続されており、しかも、その散気装置14が移流
孔10のほぼ直下に位置しているため、上記散気装置14の
ばっ気によって第２ばっ気槽５内における上記移流孔10
近傍の液面が第３図および第４図に示すように盛り上が
り脈動する。この脈動によって、上記液面付近のSSが上
記移流孔10から第１ばっ気槽４内に返送される。SS返送
促進笠12が設けられていれば、このSS返送の速度はより
促進される。これによって、第１ばっ気槽４内のSS濃度
は低下するようなことはなく、むしろ、上述のように、
第２ばっ気槽５内の好気性接触濾材13から分離して浮遊
するSSも返送されるため、第１ばっ気槽４内の生物密度
（MLSS）は増加する。これにより、流入汚水量が大きく
変動しても、第１ばっ気槽４内を高濃度状態に維持で
き、効果的に有機物の除去と脱窒が行える。 次に、上記SS返送の実験例について述べる。 第２ばっ気槽５の散気により（第１ばっ気槽４の散
気、無散気に抱らず）第２ばっ気槽５のSSは第１ばっ気
槽４に返送され、第２ばっ気槽５のSSはほぼ無くなっ
た。 この返送形態は散気による水面の持ち上がりに脈動が
あるからであり、逆流と順流が渦流を形成している。 汚水の流入がなければ、第１ばっ気槽４の散気風量の
多少に抱らず、移流バッフル11内にSSは浸入せず、この
場合、移流バッフル11の下端が浮遊面になっている。 汚水流入があると、第１ばっ気槽４の浮遊SSは第２ば
っ気槽５にキャリオーバする。そして、流入停止時にSS
のみが返送されてくる。 10/min以上の流量で流入する時、第２ばっ気槽５に
SSが移流することを防ぐことは困難である。 しかし、流入停止時にSSの返送速度をより増加させる
ことは、移流孔10近辺の形状を工夫すれば可能である。 そこで、上記実施例で述べた通り、移流孔10にSS返送
促進笠12を取り付けてSSの返送速度をテストしたとこ
ろ、下記の表１および表２に示すように、SS返送速度が
飛躍的に増加した。 上記表１はWL（LWL＋5mm）での第２ばっ気槽のSV10の
変化であり、上記表２はWL（LWL＋100mm）での第２ばっ
気槽のSV10の変化である。 ここで、SV10について説明する。 浮遊固形物（SS）を含む汚濁水をメスシリンダに汲み
取り、静置させるとSS分は沈降し、上澄液との間に境界
ができる。この境界の汚泥容量を容積％で示したのがSV
（Sludge Volumeの略）であり、下付の10は静置時間が
10分間であったことを示している。 次に、上記表１および表２の見方について説明する。 表1,2の左側の時間は運転の経過時間を示し、他方右
側の数値はSV値（％）を示している。例えば、表１を用
いて説明すると、測定開始時（０分）にはSV10が43％で
あったのが、90分間の運転経過後ではSV10が25％に減少
している。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, 1 is a single septic tank, and in this septic tank 1, a contaminant storage tank (hereinafter referred to as a storage tank) that receives inflowing wastewater from the inflow pipe 2 and performs anaerobic treatment ) 3, the first aeration tank 4 for receiving the sewage advancing from the storage tank 3 and performing the intermittent aeration treatment, and the first aeration tank 4
A second aeration tank 5 for contact aeration treatment of the mixed liquid advancing from the aeration tank 4 and a settling tank 6 for inflowing the mixed liquid subjected to the contact aeration treatment in the second aeration tank 5 are provided. Each is divided and formed. 7 is an anaerobic filter material housed in the storage tank 2;
8 is an advection pipe also serving as a baffle for advancing sewage in the lower part of the anaerobic filter medium 7 in the storage tank 2 to the bottom side of the first aeration tank 3, and 9 is the advection pipe in the first aeration tank 4. An air diffuser arranged near the lower end side of 8, 10 is the first
It is an advection hole that connects the aeration tank 4 and the second aeration tank 5, and the advection hole 10 is surrounded by an advection baffle 11 provided in the first aeration tank 4. 12 is continuously provided on the upper edge of the advection hole 10 and projects obliquely downward in the second aeration tank 5 to remove suspended microorganisms (SS) in the second aeration tank 5 from the advection hole 10 to the first 1 SS return promotion cap for promoting return to the aeration tank 4. 13 is an aerobic contact filter medium housed and arranged in the second aeration tank 5, 14 is an air diffuser arranged on the bottom side of the second aeration tank 5, and this air diffuser 14 is the SS return promoting cap It is located just below 12. And the above SS return promotion shade 12
An aeration upflow advection tube 15 is arranged between the air diffuser 14 and the air diffuser 14. 6a is an inclined wall of the settling tank 6, and this inclined wall 6a promotes the settling of the separated sludge in the settling tank 6 and returns it to the bottom side of the second aeration tank 5 by gravity settling. 16 is provided on the upper side of the settling tank 6 described above.
A pump chamber for inflowing the supernatant liquid, 17 is a constant amount discharge pump arranged in the pump chamber 16, and by the constant amount discharge pump 17, the supernatant liquid flowing into the pump chamber 16 is
The settling tank 6 is allowed to flow into the disinfecting tank 18 formed on the upper side. Here, the above-mentioned fixed amount discharge pump
The numeral 17 transfers the supernatant of the storage tank 3 into the disinfection tank 15 for a flow rate that is approximately the average of the inflow of waste water. Therefore, the disinfecting clarified liquid is discharged from the disinfecting tank 18 on average on the basis of the inflow amount of the sewage. The detailed structure of the constant-rate discharge pump 17 is described in Japanese Utility Model Publication No. 58-4398.
No. 8 is disclosed. 19 is a medicine tube. Next, the operation will be described. The wastewater that has flowed into the storage tank 3 from the inflow pipe 2 becomes a downward flow and passes through the anaerobic filter material 7 to separate coarse solids, and then passes through the advection pipe 8 to the inside of the first aeration tank 4. Transfer to. In the first aeration tank 4, the air diffuser 9 performs intermittent aeration. As a result, nitrification reaction and denitrification reaction occur and denitrification is performed. At the same time, dephosphorization is also performed. Then, when the sewage flows in, the aeration mixed solution containing SS rises in the advection baffle 11 and is admitted into the second aeration tank 5 through the advection hole 10. In the second aeration tank 5, the so-called contact aeration is carried out by passing the mixed liquid due to the aeration of the air diffuser 14 through the aeration upflow advection pipe 15 and then through the aerobic contact filter medium 13 in a downward flow. Processing is performed. Then, the aerated mixed liquid flows into the settling tank 6, where the sludge is returned to the bottom side in the second aerated tank 5 along the inclined wall 6a, and the supernatant liquid is pump chamber 16 By flowing into the inside, it is admitted to the disinfection tank 18 by the constant amount discharge pump 17 at a flow rate that averages the daily inflow of sewage. Therefore, even if there is an excessive inflow of sewage temporarily, the discharge from the settling tank 6 is limited, so the liquid level of the first aeration tank 4, the second aeration tank 5, and the precipitation tank 6 rises. However, the effective volume of each tank expands, the processing residence time in each tank is secured, and short advection is prevented. Then, the treated water having a small flow rate on average is used in the disinfection tank 18
It is sterilized inside and discharged outside the system. The above sewage treatment cycle is a case where sewage is flowing into the storage tank 3 at a peak flow rate, and when the sewage inflow is interrupted, the advection from the first aeration tank 4 to the second aeration tank 5 is slightly The amount becomes small and the inside of the advection baffle 11 becomes almost stationary. In the second aeration tank 5, the aeration by the air diffuser 14 is continued, and since the air diffuser 14 is located almost directly below the advection hole 10, the air diffuser 14 is The advection hole 10 in the second aeration tank 5 by aeration
The liquid surface in the vicinity rises and pulsates as shown in FIGS. 3 and 4. Due to this pulsation, SS near the liquid surface is returned to the inside of the first aeration tank 4 through the advection hole 10. If the SS return promotion shade 12 is provided, the speed of this SS return is further accelerated. As a result, the SS concentration in the first aeration tank 4 does not decrease, but rather, as described above,
Since the SS which is separated from the aerobic contact filter medium 13 in the second aeration tank 5 and floats is also returned, the organism density (MLSS) in the first aeration tank 4 increases. As a result, even if the amount of inflowing sewage greatly changes, the inside of the first aeration tank 4 can be maintained in a high concentration state, and organic matter can be effectively removed and denitrified. Next, an experimental example of the above SS return will be described. The SS of the second aeration tank 5 is returned to the first aeration tank 4 due to the aeration of the second aeration tank 5 (without the aeration of the first aeration tank 4 and the non-aeration). The SS of aeration tank 5 has almost disappeared. This return form has a pulsation in the lifting of the water surface due to air diffusion, and the backflow and the forward flow form a vortex. If there is no inflow of sewage, SS does not enter the advection baffle 11 regardless of the amount of diffused air in the first aeration tank 4, and in this case, the lower end of the advection baffle 11 is a floating surface. . When sewage flows in, the floating SS in the first aeration tank 4 carries over to the second aeration tank 5. And when the inflow stops, SS
Only will be returned. When flowing in at a flow rate of 10 / min or more, enter the second aeration tank 5.
It is difficult to prevent SS from migrating. However, it is possible to further increase the SS return speed when the inflow is stopped by devising the shape in the vicinity of the advection hole 10. Therefore, as described in the above embodiment, when the SS return promotion shade 12 was attached to the advection hole 10 and the SS return rate was tested, the SS return rate was dramatically increased as shown in Tables 1 and 2 below. Increased. Table 1 is the change in the second aeration tank SV 10 of at WL (LWL + 5mm), Table 2 is the change in the second aeration tank SV 10 of at WL (LWL + 100mm). Here, the SV 10 will be described. When polluted water containing suspended solids (SS) is pumped into a graduated cylinder and left to stand, the SS content will settle and a boundary will form with the supernatant. SV shows the sludge volume at this boundary in volume%.
(Abbreviation of Sludge Volume), the subscript 10 is the standing time
It shows that it was 10 minutes. Next, how to read Tables 1 and 2 will be described. The time on the left side of Tables 1 and 2 indicates the elapsed time of operation, while the value on the right side indicates the SV value (%). For example, referring to Table 1, SV 10 was 43% at the start of measurement (0 minutes), but after 90 minutes of operation, SV 10 decreased to 25%.
以上のように、この発明によれば、第１ばっ気槽と第
２ばっ気槽との組合せにより、汚水流入が間歇的で且つ
汚水流入量が変動しても、汚水の流入停止時には、第２
ばっ気槽のばっ気による液面の盛り上がり脈動によって
第２ばっ気槽内の浮遊生物が第１ばっ気槽に返送される
ので、第１ばっ気槽内の生物濃度を常時安定した高濃度
状態に維持でき、従って、この状態で第１ばっ気槽を間
歇ばっ気すれば、硝化反応と脱窒反応が促進して効果的
な脱窒が行われる。また、同時に脱リンも行われる。 また、第１ばっ気槽の非ばっ気時に汚水の流入があっ
ても第２ばっ気槽は常時ばっ気されているため、安定し
た処理水を放流できるという効果がある。 さらに、沈殿槽の上澄液が、定量排出ポンプによって
消毒槽に移流されので、この消毒槽から消毒後の清澄水
を平均流量で放流させることができる。 以上、この発明では、汚水流入が間歇的で且つ汚水流
入量が変動しても、安定した汚水処理を効率よく行うこ
とができ、例えば、家庭用合併汚水処理の水質安定と効
果的な脱窒が図れる。As described above, according to the present invention, by the combination of the first aeration tank and the second aeration tank, even if the inflow of sewage is intermittent and the inflow of sewage fluctuates, when the inflow of sewage is stopped, Two
The floating organisms in the second aeration tank are returned to the first aeration tank due to the rising pulsation of the liquid surface due to the aeration of the aeration tank, so the organism concentration in the first aeration tank is always stable and in a high concentration state. Therefore, if the first aeration tank is intermittently aerated in this state, the nitrification reaction and the denitrification reaction are promoted and effective denitrification is performed. At the same time, dephosphorization is also performed. Further, even if sewage flows in when the first aeration tank is not aerated, the second aeration tank is constantly aerated, so that there is an effect that a stable treated water can be discharged. Furthermore, since the supernatant liquid of the precipitation tank is transferred to the disinfection tank by the constant amount discharge pump, clear water after disinfection can be discharged from this disinfection tank at an average flow rate. As described above, in the present invention, stable sewage treatment can be efficiently performed even if sewage inflow is intermittent and the sewage inflow amount fluctuates. For example, stable water quality and effective denitrification of household combined sewage treatment are possible. Can be achieved.
第１図はこの発明の一実施例による浄化槽の横断平面
図、第２図は同浄化槽の縦断面図、第３図はSS返送促進
笠を取り付けた状態での液面盛り上がり脈動状態を示す
断面図、第４図はSS返送促進笠がない状態での液面盛り
上がり脈動状態を示す断面図である。 図において、１は浄化槽、４は第１ばっ気槽、５は第２
ばっ気槽、６は沈殿槽、９は散気装置、10は移流孔、11
は移流バッフル、14は散気装置、17は定量排出ポンプ、
18は消毒槽である。FIG. 1 is a cross-sectional plan view of a septic tank according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of the septic tank, and FIG. 3 is a cross section showing a liquid level rising pulsation state with an SS return promotion cap attached. FIG. 4 and FIG. 4 are cross-sectional views showing the swelling pulsation of the liquid surface without the SS return promoting shade. In the figure, 1 is a septic tank, 4 is a first aeration tank, and 5 is a second
Aeration tank, 6 is a settling tank, 9 is an air diffuser, 10 is an advection hole, 11
Is an advection baffle, 14 is an air diffuser, 17 is a constant discharge pump,
18 is a disinfection tank.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松本 十郎 東京都港区芝浦３丁目６番18号 西原ネ オ工業株式会社内 (56)参考文献 実開 昭50−121551（ＪＰ，Ｕ) 実開 昭57−140899（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Juro Matsumoto 3-6-18 Shibaura, Minato-ku, Tokyo Nishihara Neo Industry Co., Ltd. (56) References 57-140899 (JP, U)
Claims (2)
動がある浄化槽において、上記汚水を受け入れ間歇ばっ
気処理を行う第１ばっ気槽と、この第１ばっ気槽から液
を移流させ、該移流液の接触ばっ気処理を行う第２ばっ
気槽と、この第２ばっ気槽から処理液を流入させて上澄
液をほぼ日平均汚水量に等しい流量の定量排出ポンプで
放流する沈殿槽とを備え、上記汚水の流入時には上記第
１ばっ気槽と第２ばっ気槽と沈殿槽の液面水位を汚水量
の変化量に応じて変動させ、上記汚水の非流入時に上記
第２ばっ気槽でのばっ気による該槽内液面の盛り上がり
脈動によって、上記第２ばっ気槽内の浮遊微生物を上記
第１ばっ気槽内に返送することを特徴とする浄化槽。1. In a septic tank in which sewage intermittently flows in and the amount of sewage inflow fluctuates, a first aeration tank that receives the sewage and performs an intermittent aeration process, and a liquid is transferred from the first aeration tank. Then, the second aeration tank for carrying out contact aeration treatment of the advancing liquid, and the treatment liquid is introduced from the second aeration tank, and the supernatant liquid is discharged by a constant amount discharge pump having a flow rate substantially equal to the average daily wastewater amount. And a settling tank that controls the liquid level of the first aeration tank, the second aeration tank, and the settling tank according to the amount of change in the amount of wastewater when the wastewater flows in. A septic tank characterized in that suspended microorganisms in the second aeration tank are returned to the first aeration tank by rising pulsation of the liquid level in the tank due to aeration in the second aeration tank.
して連通隣接し、上記第１ばっ気槽には上記移流孔を囲
繞する移流バッフルが設けられ、且つ第２ばっ気槽内に
おける上記移流孔の上縁部に斜め下方に突出する返送促
進笠を設け、この返送促進笠のほぼ直下に散気装置が配
置された請求項１記載の浄化槽。2. A first aeration tank and a second aeration tank communicate with each other through an advection hole and are adjacent to each other, and an advection baffle surrounding the advection hole is provided in the first aeration tank, and a second aeration tank is provided. The septic tank according to claim 1, wherein a return facilitating cap projecting obliquely downward is provided at an upper edge portion of the advection hole in the air tank, and an air diffuser is disposed substantially directly below the return facilitating cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63111516A JP2561317B2 (en) | 1988-05-10 | 1988-05-10 | Septic tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63111516A JP2561317B2 (en) | 1988-05-10 | 1988-05-10 | Septic tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01284394A JPH01284394A (en) | 1989-11-15 |
| JP2561317B2 true JP2561317B2 (en) | 1996-12-04 |
Family
ID=14563297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63111516A Expired - Fee Related JP2561317B2 (en) | 1988-05-10 | 1988-05-10 | Septic tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2561317B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2644103B2 (en) * | 1991-06-14 | 1997-08-25 | 株式会社クボタ | Septic tank |
| JP2839052B2 (en) * | 1992-05-07 | 1998-12-16 | 株式会社クボタ | Septic tank |
| JP5341377B2 (en) * | 2008-03-17 | 2013-11-13 | 株式会社クボタ | Septic tank |
| WO2009116463A1 (en) * | 2008-03-17 | 2009-09-24 | 株式会社クボタ | Purifying tank |
| CN104710085B (en) * | 2015-04-02 | 2017-07-07 | 四川省科学城天人环保有限公司 | A kind of efficient AOAS integrated sewage treating apparatus and its technique |
-
1988
- 1988-05-10 JP JP63111516A patent/JP2561317B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01284394A (en) | 1989-11-15 |
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