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    • 1. 发明专利
    • BIOLOGICAL WATER TREATMENT APPARATUS
    • JPH11244890A
    • 1999-09-14
    • JP4657798
    • 1998-02-27
    • MITSUBISHI ELECTRIC CORPTAKASU HIROSHI
    • FURUKAWA SEIJIHIROTSUJI JUNJITOKIMORI KOUICHIKIMURA HIROSHITAKASU HIROSHIMATSUDA HATSUHIRO
    • C02F3/00C02F3/30
    • PROBLEM TO BE SOLVED: To make it possible to well remove the phosphorus component in sewage by disposing a means for detecting the amt. of the phosphorus flowing into a biological reaction vessel in an apparatus provided with a means for adding a chemical into the biological reaction vessel into which the sewage flows and adjusting the amt. of the chemical to be added according to a difference between the measured value and a target value. SOLUTION: The sewage is introduced via piping a into the biological reaction vessel 1 where the sewage is mixed and agitated with activated sludge under the supply of air from an aerator 4 and the pollutant in the sewage is biologically oxidation decomposed. The liquid mixture composed of the sewage and the activated sludge is next sent to a settling basin 5 where the activated sludge is settled and separated and the supernatant water is released from a piping (c). Part of the activated sludge is returned via piping (f) to an aeration tank 2. At this time, the amt. of the phosphorus to be added per unit time is computed by an arithmetic and logic unit 12 from the measured values of a flow meter 10 and a phosphorus concn. meter 11. An injection pump 9 is controlled by a deviation between this computed value and the set value by a setter 13, by which the addition amt. of a flocculating agent which is the chemical in a storage tank 8 is controlled.
    • 2. 发明专利
    • BIOLOGICAL PHOSPHOROUS REMOVING DEVICE
    • JPH11244889A
    • 1999-09-14
    • JP4610698
    • 1998-02-27
    • MITSUBISHI ELECTRIC CORPTAKASU HIROSHI
    • TOKIMORI KOUICHIKIMURA HIROSHIFURUKAWA SEIJIHIROTSUJI JUNJITAKASU HIROSHIMATSUDA HATSUHIRO
    • C02F3/30
    • PROBLEM TO BE SOLVED: To secure good water quality by providing a biological reaction vessel, into which sewage flow and which is constituted of an anaerobic vessel and an aerobic vessel, and controlling the quantity of aeration in the aerobic vessel corresponding to the difference between the detected value and the target value of phosphorus concentration in the anaerobic vessel to constantly and excellently removed a phosphorus component in sludge. SOLUTION: The sewage is introduced into the anaerobic vessel in the biological reaction vessel through a pipe line (a). In the anaerobic vessel 1, phosphorus is discharged from phosphorus-accumulating microorganisms and in the aerobic vessel 2, phosphorus is excessively taken in the microorganisms, Next, a mixed solution containing the microorganisms, in which phosphorus is taken, is sent to a precipitating pond 4, where the microorganisms are precipitated and the supernatant water is discharged from a pipe line (c). A part of the microorganisms is taken out of the system through the pipe line (e) and the other microorganisms are returned to the anaerobic vessel through a pipe line (f). In such a case, a phosphoric acid based phosphorus concentration meter 7 is provided to detect the quantity of phosphorus to be discharged from the phosphorus-accumulating microorganisms and the output of the aeration device 3 is controlled corresponding to the deviation between the measured value and the target value setted in a setting instrument 8.
    • 3. 发明专利
    • BIOLOGICAL NITROGEN REMOVING APPARATUS
    • JPH11244894A
    • 1999-09-14
    • JP4610598
    • 1998-02-27
    • MITSUBISHI ELECTRIC CORPTAKASU HIROSHI
    • TOKIMORI KOUICHIKIMURA HIROSHIFURUKAWA SEIJIHIROTSUJI JUNJITAKASU HIROSHIMATSUDA HATSUHIRO
    • C02F3/12C02F3/34
    • PROBLEM TO BE SOLVED: To assure good water quality by measuring the amt. of the ammoniacal nitrogen released from a nitrification treatment vessel into which water to be treated after the passage through a denitrification treatment vessel flows and adjusting an aeration quantity according to a difference between the measured value and a target value. SOLUTION: The water to be treated flows through a piping (a) into the denitrification treatment vessel 1. The water to be treated after the passage through the denitrification treatment vessel 1 enters the nitrification treatment vessel 2 where the water is subjected to the aeration treatment and thereafter, the water to be treated is sent to a final settling basin 3. Activated sludge is settled and separated in this basin. Part of the activated sludge is returned via a piping (f) to the denitrification treatment vessel 1. At this time, the concn. of the ammoniacal nitrogen in the water released from the nitrification treatment vessel 2 is measured by a concn. meter 7 and the flow rate of the released water by a flow meter 8, respectively. The amt. of the released ammoniacal nitrogen is computed in a controller 10 from the results of the measurement and the operation of the aerator 4 is controlled according to the deviation between the computed value and the target value by a setter 9, by which the nitrogen component in the pollutant is efficiently removed.