JPH01119396A - Method and equipment for regulating sludge concentration in sewage treatment tank - Google Patents
Method and equipment for regulating sludge concentration in sewage treatment tankInfo
- Publication number
- JPH01119396A JPH01119396A JP62275987A JP27598787A JPH01119396A JP H01119396 A JPH01119396 A JP H01119396A JP 62275987 A JP62275987 A JP 62275987A JP 27598787 A JP27598787 A JP 27598787A JP H01119396 A JPH01119396 A JP H01119396A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- time
- aeration
- sewage treatment
- timer
- 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.)
- Granted
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 81
- 239000010865 sewage Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 title 1
- 238000005273 aeration Methods 0.000 claims abstract description 62
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000004062 sedimentation Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、汚水処理槽内における汚泥濃度の調整方法お
よび装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method and apparatus for adjusting sludge concentration in a sewage treatment tank.
高率の窒素除去を目的とした間欠曝気による排水処理に
かいて、同一の処理水槽内で処理水中のアンモニア態窒
素に対する硝酸態窒素の比を指標となし、間欠曝気にお
ける曝気時間と非曝気時間を増減して排水中の窒素を高
率に除去するという方法は、特公昭５６−５３４３５号
公報（発明者三橋薫 他１名）により公知である。また
、上記方法により窒素除去を行うについて、煩雑なアン
モニア態窒素と硝酸態窒素の測定を行う代夛に、それに
相関のある汚泥沈降速度を指標として自動的に曝気と非
曝気時間を調節することによル、有機物を分解すると共
に窒素を高率に除去するという方法も時開＠６０−１７
２４００号公報（発明者 三橋薫 他１名）により公知
である。In wastewater treatment using intermittent aeration for the purpose of high-rate nitrogen removal, the ratio of nitrate nitrogen to ammonia nitrogen in the treated water in the same treated water tank is used as an index, and the aeration time and non-aeration time in intermittent aeration are used as an index. A method of removing nitrogen from wastewater at a high rate by increasing or decreasing the nitrogen content is known from Japanese Patent Publication No. 56-53435 (inventor: Kaoru Mitsuhashi and one other person). In addition, in order to remove nitrogen using the above method, in addition to the complicated measurement of ammonia nitrogen and nitrate nitrogen, it is necessary to automatically adjust the aeration and non-aeration times using the sludge settling rate, which is correlated with the measurement, as an index. Yoruru, a method that decomposes organic matter and removes nitrogen at a high rate is also published @60-17
It is publicly known from Japanese Patent No. 2400 (inventor: Kaoru Mitsuhashi and one other person).
そしてこのような窒素除去を目的とする活性汚泥法等に
おいては、処理槽内または硝化槽内に硝化菌を保持する
ため、汚泥の引抜は慎重に行わねばならない、特に汚泥
の沈降を曝気と非曝気の指標とする間欠曝気の自動運転
においては、汚泥濃度を一定範囲内に保つことが不可欠
の要件となる。In the activated sludge method, etc. whose purpose is to remove nitrogen, sludge must be carefully removed because nitrifying bacteria are retained in the treatment tank or nitrification tank. In automatic operation of intermittent aeration, which is used as an aeration indicator, it is essential to maintain sludge concentration within a certain range.
本発明の目的は、前述の特開昭６０−１７２４００号発
明における曝気時間変動を利用して、汚泥の引抜きにつ
いても自動制御を可能となし、処理槽液中に一定の汚泥
微生物が保持されて間欠曝気条件に真に適合した汚泥濃
度の調整を、濃度計を用いることなく笥易に行わせ、回
分式間欠曝気の自動制御と結合させることによって汚水
処理施設の運転管理の自動化と省力化に寄与せしめるこ
とにある。The purpose of the present invention is to make it possible to automatically control sludge extraction by utilizing the aeration time variation in the invention of JP-A-60-172400 mentioned above, and to maintain a certain level of sludge microorganisms in the treatment tank liquid. Adjustment of sludge concentration that truly matches intermittent aeration conditions can be easily performed without using a concentration meter, and by combining it with automatic control of batch-type intermittent aeration, automation and labor saving of operation management of sewage treatment facilities can be achieved. The purpose is to make a contribution.
本発明に係る汚水処理槽内における汚泥濃度の調整方法
では、汚泥沈降速度検出光センサーにより検出された汚
泥の沈降速度を指標とし曝気と非曝気の時間を増減して
汚水中の窒素を高率に除去する間欠曝気式汚水処理方法
において、上記元センサーによる時間をタイマーに入力
してその入力せられた時間がタイマーの設定時間を超え
た場合に、所定量の汚泥を排出することＫよシ汚水処理
槽内の汚泥濃度を一定の範囲内に保持させるのである。In the method for adjusting the sludge concentration in a sewage treatment tank according to the present invention, the sludge settling rate detected by the sludge settling rate detection optical sensor is used as an index, and the aeration and non-aeration times are increased or decreased to increase the nitrogen content in the sewage. In the intermittent aeration type sewage treatment method, the time determined by the source sensor is input into a timer, and when the input time exceeds the set time of the timer, a predetermined amount of sludge is discharged. The sludge concentration in the sewage treatment tank is maintained within a certain range.
本発明に係る汚水処理槽内における汚泥濃度の調整装置
においては、汚泥沈降速度検出光センサーによ〕検出さ
れた汚泥の沈降速度を指標とし汚水処理槽内における曝
気と非曝気の時間を増減して汚水中の窒素を高率に除去
する間欠曝気設備を備え、上記光センサーによる時間を
入力するタイマーを設け、且つその入力せられた時間が
タイマーの設定時間を超えた場合に汚水処理槽内から所
定量の汚泥を排出させるための汚泥引抜信号が出される
よう構成せられている。In the sludge concentration adjustment device in a sewage treatment tank according to the present invention, the sludge sedimentation rate detected by the sludge sedimentation rate detection optical sensor is used as an index to increase or decrease the aeration and non-aeration time in the sewage treatment tank. It is equipped with intermittent aeration equipment that removes nitrogen from wastewater at a high rate, and is equipped with a timer that inputs the time from the above optical sensor, and when the input time exceeds the timer setting time, the inside of the sewage treatment tank is The sludge extraction signal is configured to output a predetermined amount of sludge from the sludge.
回分式間欠曝気を行っている処理槽中の汚泥の沈降速度
は、アンモニア態窒素に対する硝酸態窒素の比に正の相
関がある。The sedimentation rate of sludge in a treatment tank undergoing batch intermittent aeration is positively correlated with the ratio of nitrate nitrogen to ammonia nitrogen.
即ち、前記特開昭６０−１７２４００号公報中にも記載
せられているよりに、曝気量が流入負荷や汚泥濃度に比
べて多い場合は、微生物による分解およびアンモニア態
窒素の硝化が進んで硝酸態窒素が多くなシ、このような
条件下では汚泥も沈降速度の早いフロック形成菌が増加
して沈降速度が大きくなるため、センサーで検出する時
間は短かく、従って曝気時間も自動的に短かくなって過
剰曝気を防ぐ方向へと運示されることになる。また、曝
気量が流入負荷や汚泥濃度に比べて少ないときは、嫌気
的となって有機態窒素の分解や硝酸態窒素の還元でアン
モニア態窒素が多くなシ、このよう表条件下では７０ツ
ク形成菌は減少し、糸状菌など沈降性の小さい細菌が多
くなるため汚泥の沈降速度は小さくなシ、従ってセンサ
ーで検出する時間は長く、曝気時間が自動的に延長され
て不足酸素を補５方向へと運転されるととくなる。汚泥
の増殖速度が大きくなル、汚泥濃度が増大して汚泥の消
費酸素が増えると、槽内水の状態は嫌気的となって沈澱
時間が長くなる。ここで本発明では、元センサーによっ
て検出された一定時間を超えた場合に処理槽内の汚泥を
所定量余剰汚泥として排出させることを特徴とし、この
操作によって汚泥濃度は減少し、汚泥濃度調整の目的を
達することになる。なお、汚泥濃度増大以外の事由で槽
内水が嫌気的と表シ、光センサー検出時間が延長した場
合も汚泥を排出するが、汚泥濃度が設定濃度以下に低下
しても、１回の汚泥排出量が過大でなければ槽内水の状
態は好気的とな）、汚泥が次第に増殖して自然に正常な
状態に戻る。That is, as described in JP-A-60-172400, if the amount of aeration is larger than the inflow load or sludge concentration, the decomposition by microorganisms and the nitrification of ammonia nitrogen progress, resulting in nitric acid. Under these conditions, the number of floc-forming bacteria that settle quickly in the sludge increases, increasing the settling rate, so the detection time with the sensor is short, and therefore the aeration time is automatically shortened. In this way, the operation will be directed towards preventing excessive aeration. In addition, when the aeration amount is small compared to the inflow load and sludge concentration, it becomes anaerobic and a large amount of ammonia nitrogen is produced due to decomposition of organic nitrogen and reduction of nitrate nitrogen. The number of forming bacteria decreases, and bacteria with low sedimentation properties such as filamentous fungi increase, so the settling speed of the sludge is low. Therefore, the detection time with the sensor is long, and the aeration time is automatically extended to compensate for the lack of oxygen. When you drive in that direction, it becomes . When the growth rate of sludge increases, the sludge concentration increases, and the amount of oxygen consumed by the sludge increases, the state of the water in the tank becomes anaerobic and the settling time becomes longer. Here, the present invention is characterized in that a predetermined amount of sludge in the treatment tank is discharged as surplus sludge when the predetermined time detected by the original sensor is exceeded, and by this operation, the sludge concentration is reduced, and the sludge concentration adjustment is performed. You will reach your goal. Note that sludge is also discharged when the water in the tank becomes anaerobic due to reasons other than an increase in sludge concentration, and the detection time of the optical sensor is extended, but even if the sludge concentration drops below the set concentration, one sludge discharge is performed. If the amount of water discharged is not excessive, the condition of the water in the tank is aerobic), the sludge will gradually grow and return to normal conditions naturally.
第１図に示すよう、汚水処理槽ｌ内の水面下−定の深さ
に２板の平行なガラス板２ａ、２ｂを挾んで透過形光セ
ンサーの投光面３ａと受光面３ｂを対向状に設置し、各
回分処理中の曝気時間と非曝気時間の長さを、前回の回
分処理修了時における光センサー設置深さまでの汚泥の
沈降時間に依存して決められるようにする。汚泥の沈降
時間を曝気時間の長さに変換する機構は次のとおシであ
る。As shown in Fig. 1, two parallel glass plates 2a and 2b are sandwiched between two parallel glass plates 2a and 2b at a certain depth below the water surface in a sewage treatment tank l, and the light emitting surface 3a and light receiving surface 3b of the transmission type optical sensor are placed opposite each other. The length of the aeration time and non-aeration time during each batch treatment can be determined depending on the settling time of the sludge to the optical sensor installation depth at the completion of the previous batch treatment. The mechanism for converting sludge settling time into aeration time is as follows.
先ず、第２図に示す第１タイマーと第２タイマーを共に
１回の曝気時間と非曝気時間の合計時間に設定しておく
。First, both the first timer and the second timer shown in FIG. 2 are set to the total time of one aeration time and one non-aeration time.
メインタイマーがＯＮになると沈澱および放流のため間
欠曝気制御系は停止し、それと同時に第１タイマーが計
時を始める。また、汚水処理槽ｌ内の汚泥を均一にする
ため短時間（２〜３分）の曝気攪拌を行う。同時に透過
形光センサーに入力し、投光させる。初め社汚泥に妨げ
られて光は透過しないが、汚泥が沈降して汚泥界面ｔ２
が元センサーの設定水深を過ぎると元センサーは受
光し、第２タイマーを発進させる。やがて曝気と非曝気
の合計時間になり、第１タイマーが計時を終ると、＄２
タイマーも同時に計時動作を中断する。その後放流装置
５によって放流が始まシ、処理槽ｌ内の水位ｔ１が設定
水位に達すると放流は終わる。When the main timer turns on, the intermittent aeration control system stops for sedimentation and discharge, and at the same time, the first timer starts timing. In addition, in order to make the sludge in the sewage treatment tank l uniform, aeration and stirring are performed for a short time (2 to 3 minutes). At the same time, input is input to the transmission type light sensor and light is emitted. At first, the light does not pass through because it is blocked by the sludge, but as the sludge settles, the light passes through the sludge interface t2.
When the depth exceeds the water depth set by the original sensor, the original sensor receives light and starts the second timer. Eventually, the total time of aeration and non-aeration is reached, and when the first timer finishes counting, $2
The timer also interrupts its timekeeping operation at the same time. Thereafter, the discharge device 5 starts discharging water, and when the water level t1 in the treatment tank l reaches the set water level, the discharging ends.
所定時間後メインタイマーがＯＦＦになるとｊｇ１タイ
マーは発進し、曝気装置４によって曝気を開始する。同
時忙中断状態であった第２タイマーは計時を再開し、残
シの時間を計時し終ると曝気を止め、再スタートする。When the main timer is turned off after a predetermined time, the jg1 timer starts and the aeration device 4 starts aeration. At the same time, the second timer, which was in a busy interruption state, resumes timing, and when it finishes counting the remaining time, aeration is stopped and restarted.
更に時間が経過して第１タイマーが１回目の計時を終了
すると再び曝気が始まシ、第２タイマーが次の計時を終
えるまで曝気が就く。つまシ、第１タイマーは曝気開始
タイマーであシ、第２タイマーは曝気停止タイマーの役
割を果たすことになる。After a further period of time has elapsed and the first timer finishes counting the first time, aeration starts again and continues until the second timer finishes counting the next time. The first timer is the aeration start timer, and the second timer is the aeration stop timer.
以上のように曝気時間の長さは、汚泥界面ｔ２が設定さ
れたセンサーの深さにまで沈降するのに要する時間と同
一であシ、設定された曝気と非曝気の合計時間から沈降
時間を差引いた残シの時間が非曝気時間となる。もし酸
素供給量が不足し、汚泥の沈降時間が長くなると次回の
曝気時間はそれだけ長くな）、非曝気時間は短かくなる
。また反対に、酸素供給量が過剰で汚泥の沈降速度が速
くなると、曝気時間が縮められることに唸る。As mentioned above, the length of the aeration time is the same as the time required for the sludge interface t2 to settle to the set depth of the sensor, and the settling time is calculated from the set total time of aeration and non-aeration. The remaining time after subtraction becomes the non-aeration time. If the amount of oxygen supply is insufficient and the settling time of the sludge becomes longer, the next aeration time will be that much longer), and the non-aeration time will be shorter. Conversely, if the amount of oxygen supplied is excessive and the sludge settles faster, the aeration time will be shortened.
第３Ｐ！Ｊに間欠曝気の自動制御における酸素供給量の
適否と汚泥の沈降性、曝気量および余剰汚泥排出等の関
係を示す。3rd P! J shows the relationship between the appropriateness of the oxygen supply amount, sludge settling property, aeration amount, excess sludge discharge, etc. in automatic control of intermittent aeration.
汚泥の沈降時間が一定時間を超えた場合には、汚泥引抜
信号に従い自動または手動操作によって汚泥引抜装置６
を駆動させ、一定量の汚泥を処理槽ｌ内から排出させる
のであるが、上記汚泥引抜信号は、元センサーによる時
間を第３タイマーに入力してその入力せられた時間が第
３タイマーの設定時間を超えた場合に発せられるのであ
る。When the settling time of sludge exceeds a certain time, the sludge extraction device 6 is activated automatically or manually according to the sludge extraction signal.
is driven to discharge a certain amount of sludge from the treatment tank l.The sludge extraction signal is generated by inputting the time measured by the original sensor to the third timer and setting the third timer to the time inputted. It is issued when the time is exceeded.
本発明によれば、汚水処理槽内における汚泥濃度の調整
が、濃度計を用いることなく汚泥の沈降時間に依存して
簡易に行わせられ、従来困難とされていた汚泥の引抜き
についても自動化が可能となシ、汚泥の沈降を指標とす
る回分式間欠曝気の自動制御と結合させることによって
、汚水処理施設の運転管理の自動化と省力化に寄与し得
るのである。According to the present invention, the sludge concentration in the sewage treatment tank can be easily adjusted depending on the sedimentation time of the sludge without using a concentration meter, and sludge extraction, which was conventionally considered difficult, can be automated. By combining this method with automatic control of batch-type intermittent aeration using sludge sedimentation as an indicator, it is possible to contribute to automation and labor savings in the operational management of sewage treatment facilities.
＄１図は本発明の実施対象とされる汚水処理槽の縦断側
面図、第２図は間欠曝気の回分処理と曝気制御の関係を
示したタイムチャート、第３図は間欠曝気の自動制御に
おける酸素供給量の適否と汚泥の沈降性、曝気量、余剰
汚泥排出等の関係を示し九フローチャートである。
１・・・・・・汚水処理槽、２ａ、２ｂ・−・・・・ガ
ラス板、３ａ・−・・・・光センサーの投光面、３ｂ・
・・・・・光センサーの受光面、４・・・・・・曝気装
置、５・・・・・・放流装置、特許出願人 株式会社
鶴見製作所Figure 1 is a vertical side view of a sewage treatment tank to which the present invention is applied, Figure 2 is a time chart showing the relationship between batch processing of intermittent aeration and aeration control, and Figure 3 is a diagram showing the relationship between batch processing of intermittent aeration and aeration control. 9 is a flowchart showing the relationship between the appropriateness of the oxygen supply amount, sludge settling property, aeration amount, excess sludge discharge, etc. 1...Sewage treatment tank, 2a, 2b...Glass plate, 3a...Projecting surface of optical sensor, 3b...
... Light receiving surface of optical sensor, 4 ... Aeration device, 5 ... Discharge device, Patent applicant Tsurumi Seisakusho Co., Ltd.
Claims (1)
降速度を指標とし、曝気と非曝気の時間を増減して汚水
中の窒素を高率に除去する間欠曝気式汚水処理方法にお
いて、 上記光センサーによる時間をタイマーに入力してその入
力せられた時間が、タイマーの設定時間を超えた場合に
、所定量の汚泥を排出することにより汚水処理槽内の汚
泥濃度を一定の範囲内に保持させることを特徴とする、 汚水処理槽内における汚泥濃度の調整方法。 〔第２項〕 汚泥沈降速度検出光センサーにより検出された汚泥の沈
降速度を指標とし、汚水処理槽内における曝気と非曝気
の時間を増減して汚水中の窒素を高率に除去する間欠曝
気設備を備え、 上記光センサーによる時間を入力するタイマーを設け、 且つその入力せられた時間がタイマーの設定時間を超え
た場合に汚水処理槽内から所定量の汚泥を排出させるた
めの汚泥引抜信号が出されるよう構成したことを特徴と
する、 汚水処理槽内における汚泥濃度の調整装置。[Scope of Claims] [Claim 1] An intermittent method for removing nitrogen in wastewater at a high rate by increasing or decreasing the aeration and non-aeration time using the sludge settling rate detected by a sludge settling rate detection optical sensor as an index. In the aeration-type sewage treatment method, the time measured by the optical sensor is input into a timer, and when the input time exceeds the timer setting time, a predetermined amount of sludge is discharged to reduce the amount of water in the sewage treatment tank. A method for adjusting sludge concentration in a sewage treatment tank, characterized by maintaining the sludge concentration within a certain range. [Section 2] Intermittent aeration that removes nitrogen in sewage at a high rate by increasing or decreasing the aeration and non-aeration time in the sewage treatment tank, using the sludge sedimentation rate detected by a sludge sedimentation rate detection optical sensor as an index. A timer is provided to input the time by the optical sensor, and a sludge withdrawal signal is provided to discharge a predetermined amount of sludge from the sewage treatment tank when the input time exceeds the set time of the timer. A sludge concentration adjustment device in a sewage treatment tank, characterized in that the device is configured to discharge sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62275987A JP2727189B2 (en) | 1987-10-31 | 1987-10-31 | Adjustment method of sludge concentration in sewage treatment tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62275987A JP2727189B2 (en) | 1987-10-31 | 1987-10-31 | Adjustment method of sludge concentration in sewage treatment tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01119396A true JPH01119396A (en) | 1989-05-11 |
| JP2727189B2 JP2727189B2 (en) | 1998-03-11 |
Family
ID=17563194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62275987A Expired - Lifetime JP2727189B2 (en) | 1987-10-31 | 1987-10-31 | Adjustment method of sludge concentration in sewage treatment tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2727189B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10151480A (en) * | 1996-11-25 | 1998-06-09 | Maezawa Ind Inc | Wastewater treatment apparatus and operation method |
| JP2005305441A (en) * | 1997-05-30 | 2005-11-04 | Mitsubishi Electric Corp | Waste water ozonization method and apparatus therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58189097A (en) * | 1982-04-30 | 1983-11-04 | Nishihara Environ Sanit Res Corp | Method for controlling apparatus for batch-type activated sludge process |
| JPS6090102A (en) * | 1983-10-19 | 1985-05-21 | 山本 惣一 | Rice-hulling metering bagging device for farmer |
| JPS60172400A (en) * | 1984-02-18 | 1985-09-05 | Kaoru Mihashi | Waste water treatment capable of controlling aeration condition of intermittent aeration based on settling velocity of sludge |
-
1987
- 1987-10-31 JP JP62275987A patent/JP2727189B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58189097A (en) * | 1982-04-30 | 1983-11-04 | Nishihara Environ Sanit Res Corp | Method for controlling apparatus for batch-type activated sludge process |
| JPS6090102A (en) * | 1983-10-19 | 1985-05-21 | 山本 惣一 | Rice-hulling metering bagging device for farmer |
| JPS60172400A (en) * | 1984-02-18 | 1985-09-05 | Kaoru Mihashi | Waste water treatment capable of controlling aeration condition of intermittent aeration based on settling velocity of sludge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10151480A (en) * | 1996-11-25 | 1998-06-09 | Maezawa Ind Inc | Wastewater treatment apparatus and operation method |
| JP2005305441A (en) * | 1997-05-30 | 2005-11-04 | Mitsubishi Electric Corp | Waste water ozonization method and apparatus therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2727189B2 (en) | 1998-03-11 |
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| EXPY | Cancellation because of completion of term |