WO2009004123A1 - Appareil et procédé pour précipitation de phosphore à partir d'eau usée - Google Patents

Appareil et procédé pour précipitation de phosphore à partir d'eau usée Download PDF

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Publication number
WO2009004123A1
WO2009004123A1 PCT/FI2008/050409 FI2008050409W WO2009004123A1 WO 2009004123 A1 WO2009004123 A1 WO 2009004123A1 FI 2008050409 W FI2008050409 W FI 2008050409W WO 2009004123 A1 WO2009004123 A1 WO 2009004123A1
Authority
WO
WIPO (PCT)
Prior art keywords
chemical
water
waste water
set forth
pump
Prior art date
Application number
PCT/FI2008/050409
Other languages
English (en)
Inventor
Ville Asikainen
Ilkka Kallio
Lauri Palmujoki
Tuomas Pelto-Huikko
Original Assignee
Biolan Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Biolan Oy filed Critical Biolan Oy
Priority to CN2008800233610A priority Critical patent/CN101730664B/zh
Priority to RU2010103367/05A priority patent/RU2480422C2/ru
Priority to EP08775534A priority patent/EP2164809A4/fr
Publication of WO2009004123A1 publication Critical patent/WO2009004123A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209—Regulation methods for flocculation or precipitation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • 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

Definitions

  • the object of this invention is an apparatus attachable to a small-scale purification unit for precipitating phosphorus from waste water.
  • a further object of the invention is a method for precipitating waste water phosphorus with a chemical coagulant from waste water in a small-scale purification unit, said method comprising delivering the waste water to be treated gravitationally into a pumping vessel which is drained by a discharge pump, dispensing the chemical coagulant by a metering pump from a chemical tank into waste water to be discharged from the pumping vessel, whereby a separation of the resulting chemical precipitate from water draining out of the purification unit takes place in a settling tank, or i.e. sedimentation tank, of the small-scale purification unit.
  • Yet another object of the invention is the use of a foregoing apparatus for precipitating phosphorus from waste water in small-scale purification units, particularly in continuous action small-scale purification units.
  • the eutrophication caused by a phosphorus load manifests itself in the multiplication of aquatic plants and biomass, as well as in abnormally abundant inflorescences of algae and cyano bacteria, the algae toxins emitted thereby being possible sources of even serious consequences.
  • the decomposition of biomass consumes oxygen, as a result of which the body of water may develop an oxygen depletion leading to fish deaths.
  • the dephosphorization can be enhanced by means of absorption masses and various chemical coagulants.
  • What is commonly used in biological-chemical purification units is an aluminum- or iron-based chemical coagulant.
  • the chemical coagulant binds phosphorus contained in waste water as compounds that can be separated from water by settling. From the standpoint of precipitation efficiency, using a correct amount of chemical is of primary importance. When the dosage is too small, there is not enough chemical to react with all phosphate ions and, thus, some of the phosphorus contained in waste water finds its way into a water system. Excessive overdosage may lower the pH- value of waste water too much as the aluminum- and iron-based chemical coagulants are highly acidic.
  • An excessively low pH-value undermines the efficiency of precipitation.
  • An efficient blending of a chemical coagulant and waste water is a condition for successful precipitation. By virtue of blending, a dose of chemical can be exploited in its entirety, nor is there any need for unnecessary overdosage.
  • the waste water develops microflocs, which may coalesce for increasingly larger floes. Increasing the size of floes is desirable for facilitating the separation thereof from water by settling. This is endeavored by an arrangement, in which the blending is followed by a mixing process. During the course of mixing, the velocity gradient or G-number of water is lower than during the course of blending.
  • the most common way of implementation is to keep the waste water in a slow rotary motion, which in large-scale plants is performed actively by means of slowly rotating blades.
  • the floes present in water must not be exposed to too excessive forces in order to not disintegrate the same as a result of such forces.
  • the biological-chemical device purification units can be divided into batch- and continuous-action purification units.
  • a batch purification unit the steps of a treatment process are carried out in a single tank. It is always the same amount of waste water that is handled by the process, whereby the chemical intended for the precipitation of phosphorus can be dispensed into each batch in a constant amount. This is convenient from the standpoint of pumping systems, since the metering pump shall always have the same running period in a desired process step.
  • the chemical coagulant is generally dispensed in an aeration step, whereby the turbulence caused by aeration blends the chemical effectively throughout the mass of water.
  • the amount of water, which is displaced by water arriving in the system proceeds gravitationally from one tank to another.
  • a technical implementation regarding the dosage of a chemical coagulant is more challenging since the amount of water proceeding from one tank to the next may fluctuate by the instant.
  • the dosage is organized by means of a timer clock. Controlled by the timer clock, a certain amount of chemical is pumped by a metering pump at desired intervals, for example once an hour.
  • the amount of chemical being administered does not depend on the amount of water arriving in the system, but some chemical shall be unnecessarily used, for example during vacation times.
  • the Finnish registered utility model No. 7006 discloses a waste water treatment apparatus for the removal of phosphorus, said apparatus comprising a phosphorus treatment unit which includes a process tank, a chemical tank for a phosphorus precipitating chemical, a dispenser for metering the chemical from the chemical tank, a chemical-and-water blending panel provided with flow-controlling partitions, and a blended water-and-chemical collecting conduit extending from a middle section of the blending panel to the process tank below.
  • the water, which is to be cleared of phosphorus in the process tank, is collected according to the example, obviously after a soil treatment, first in a pump well, from which it is then pumped into the process tank for a dephosphorization treatment, followed by conducting the treated water out of the process tank by means of a siphon, not by gravity.
  • a certain amount of chemical is first dispensed into a trough from the chemical tank prior to pumping a certain volume batch of water from the pump well.
  • the water is conducted through the trough, the chemical being picked up by the water as a result of ejector suction and the chemical being carried away from the trough.
  • Downstream of the trough apparently for ensuring a proper blending process, there is set up a blending panel provided with flow-deflecting partitions.
  • an apparatus is characterized in that the apparatus comprises a pumping vessel, a discharge pump for unloading the pumping vessel, a chemical tank, a chemical metering pump for dispensing a chemical from the chemical tank into waste water to be discharged from the pumping vessel, whereby a separation of the resulting chemical precipitate from water draining out of the purification unit is adapted to proceed in the small-scale purification unit's settling tank, the metering pump being arranged to supply a chemical coagulant into an effluent flow delivered by the discharge pump over an entire or almost entire operating cycle of the discharge pump.
  • the apparatus further comprises a mixing space, the shape of which forces the waste water, containing a chemical coagulant and being passed therethrough, into a slow rotary motion for enhancing the formation of floes produced by the chemical coagulant.
  • the objective of setting the water-chemical mixture in a slow rotary motion is to enhance the formation of a floe produced by the chemical coagulant prior to delivering the mixture into a precipitation tank, in other words into a settling tank, the purpose of a phosphorus-binding precipitate produced therein being to separate from water and settle down to the tank floor.
  • the shape of the mixing space can be any form capable of setting the chemical-coagulant-containing water in a slow rotary motion that can be either uniformly slow through the entire mixing cycle or become increasingly slower towards the end.
  • the shape of the mixing space can be any form capable of forcing the chemical-coagulant-containing waste water passing therethrough into a slow rotary motion, such as e.g. a substantially circular form.
  • a substantially circular form include e.g. a substantially cylindrical i.e. barrel-like form, a substantially spherical or semi-spherical form, a substantially conical or frusto-conical form.
  • Other substantially circular forms include a three-dimensional substantially spiral form.
  • the chemical- coagulant containing waste water be passed into a slow rotary motion in such a way that at least one wall surface of the mixing space, along which the blending water-chemical mixture is flowing, is substantially circular or curvilinear in terms of its form.
  • the mixing space is a substantially cylindrically shaped mixing container. Accordingly, it is also preferred that a waste flow issuing from the pumping vessel, and the amount of chemical coagulant to be supplied therein, be arranged to be delivered to or near the top end of the mixing container, whereby the blending water-chemical mixture flows, while in slow rotation, along the container's circular jacket surface by gravity down towards an outlet opening present in the container bottom.
  • the mixing space or container features an outlet opening, which is at a level equal to or higher than the bottom of the mixing container.
  • the mixing space or container can preferably have its outlet opening fitted with a discharge conduit provided with an expansion below the outlet opening.
  • the mixing space or container has its discharge conduit preferably extending below the water level in the settling tank.
  • the discharge conduit features a structure, enabling access of air into the discharge conduit and disabling a development of a continuous water column and suction in the discharge conduit.
  • the apparatus according to the invention can preferably be positioned downstream of a biological waste water treatment.
  • the biological pretreatment can be a biological process based on the activated sludge method, soil purification, or biological filtration.
  • the apparatus has its pump system preferably arranged to work in such a way that it includes a float switch for switching the discharge pump on and off according to predetermined maximum and minimum levels of waste water in the pumping vessel, as well as a current control relay coupled between the discharge pump and the metering pump for again switching the metering pump on when the discharge pump is supplied with electric current and off when the discharge pump is not supplied with electric current.
  • the pumps and the pump system can be constituted by any pumps or pump systems well known for a person skilled in the art.
  • the apparatus in its entirety is capable of being installed in one and the same settling tank of a small-scale purification unit or, in other words, in a sedimentation tank.
  • a method according to the invention is characterized in that at least one chemical coagulant is dispensed by the metering pump into an effluent flow delivered by the discharge pump over an entire or almost entire operating cycle of the discharge pump.
  • the waste water, containing a chemical coagulant is exposed to a mixing process for enhancing the formation of floes produced by the chemical coagulant.
  • the chemical coagulant can be any to the person skilled in the art known chemical coagulant intended for the removal of phosphorus contained in waste water, e.g. an aluminum- or iron-based chemical coagulant.
  • the chemical coagulant is preferably dispensed in the form of an aqueous solution.
  • the apparatus and method according to the invention are suitable for use in any small-scale purification units, especially in continuous-action units, comprising at least one sedimentation tank or a number of interconnected sedimentation tanks.
  • the apparatus constituting the object of claimed protection, provides advantages as follows: -In a continuous-action waste water purification process, the precipitation of phosphorus can be implemented in such a way that a chemical coagulant is only dispensed when the system is supplied with water. -Controlling the operation of a chemical pump on the basis of the operation of a discharge pump enables maintaining the dosage of chemical constant with respect to the amount of water to be treated. -Supplying the water flow to be discharged from the pumping vessel with a uniform dosage of chemical over the entire pumping cycle ensures a consistent chemical concentration as well as a high-grade blending of chemical and water in the water to be delivered into the mixing container. -Precipitation conditions remain unchanged regardless of the amount of water.
  • the mixing process in a mixing container connected to the apparatus encourages the growth of floes produced by a chemical coagulant and thereby improves the settling characteristics of resulting sludge.
  • Good settling characteristics facilitate the separation of sludge from treated water and thereby reduce the amount of phosphorus-containing precipitate escaping to the environment along with water being discharged from the system.
  • -Having the water, discharging from the mixing container, to proceed below the water level in a settling tank prevents the migration of precipitation- produced sludge out of the tank along with outgoing water.
  • an apparatus intended for the treatment of waste water which apparatus can be disposed in a sedimentation tank or a so-called settling tank 12, also referred to as a septic tank, positioned downstream of a continuous-action biological treatment unit intended, for example, for the treatment of waste waters produced by a single property.
  • Water arrives gravitationally in the settling tank 12 by way of a conduit 13 extending thereto, such that the incoming water is first conducted into and collected in a pumping vessel 1 included in the settling tank 12 at its top end.
  • a discharge pump 2 included therein has its float switch 3 activate the discharge pump 2 automatically.
  • Pumping is also deactivated by the float switch 3 once the water surface in the pumping vessel 1 has fallen to a desired level i.e. predetermined minimum level.
  • the pumping vessel's 1 capacity is preferably > 20 I. The capacity has an effect on the running frequency of a discharge pump.
  • the discharge pump's 2 running time is totally dependent on the amount of water arriving in the pumping vessel 1. In the event that water is supplied continuously, such that water in the pumping vessel 1 cannot fall to a desired minimum level, then the discharge 2 shall also be in nonstop operation.
  • Water is pumped by the discharge pump 2 into a mixing container 4, which is also located inside the settling tank 12.
  • Both the pumping vessel 1 and the mixing container 4 may also be optionally located outside the settling tank 12, but preferably and as presented in this example, such elements constitute an entity which is present inside the settling tank 12 at the top end thereof.
  • the discharge pump 2 As the discharge pump 2 is running, a desired amount of chemical coagulant is pumped by a metering pump 5 into the mixing container 4 from a chemical tank 6 located inside or outside the settling tank 12.
  • the metering pump 5 stops as well.
  • the discharge pump 2 and the metering pump 5 are interconnected by means of a current control relay (not shown).
  • the discharge pump 2 By way of the relay, the discharge pump 2 is supplied with electric current all the time.
  • the discharge pump 2 has its float switch controlling the operation of the pump 2, activating and deactivating the pump 2 according to the water level in the pumping vessel 1.
  • the current control relay functions in such a way that, whenever the discharge pump 2 is running, said relay supplies current also to the metering pump 5.
  • the relay is, so to speak, "sniffing" to discover when the discharge pump takes up current.
  • the chemical coagulant (aqueous solution) is conducted by way of a tube 14 to the vicinity of a location which marks the termination point of a pipe 7 extending from the discharge pump 2.
  • the pipe 7 terminates at a top end of the mixing container 4 having a substantially cylindrical shape in a horizontal plane, such that the water is guided to make a contact with the mixing container's 4 jacket wall in a substantially parallel relationship therewith.
  • a substantially cylindrical shape of the mixing container 4 the water arriving in the container is forced in to a rotary motion, which the water, for the most part, preferably rolls along a cylindrical vertical wall or in its vicinity down towards the container's bottom, from which it drains or rises to an outlet opening and thereby away.
  • the dwell time of water in the mixing container 4 is considerably longer than what it would be in the event of the outlet opening 8 finding itself in its entirety below the water level.
  • a longer dwell time encourages the coalescence of floes developed in water in the mixing container 4 in response to a chemical coagulant, which assists in the descent of floes in the settling tank 12.
  • the settling tank's minimum capacity is preferably about 15 I.
  • another beneficial feature in terms of the coalescence of floes is that the bottom be flat all over or at least over some sort of range around the outlet opening. Thus, the water finds no way of packing itself in the outlet opening.
  • the discharge pipe 10 extends to a water delivery pipe 11.
  • the discharge pipe 10 has its end substantially above the water level in the settling tank 12. An air space remaining between the end of the discharge pipe 10 and the water level in the settling tank 12 disables the development of a suction effect which would rapidly evacuate the mixing container 4.
  • the discharge pipe 10 and the delivery pipe 11 assume such relative positions that all of the water coming out of the discharge pipe 10 finds its way into the delivery pipe 11. Hence, the delivery pipe 11 also has its upper end above the water level.
  • An assembly constituted by the discharge pipe 10 and the delivery pipe 11 is referred to as a discharge conduit.
  • the water treated with a chemical coagulant discharges to substantially below the water level of the settling tank 12, i.e. substantially below the mouth of a pipe 15 carrying purified water out of the settling tank 12.
  • This is important in a gravitationally working system, because the amount of water going out of the tank matches the amount of water coming in. In order to obtain a good purification result, it is essential that no phosphorus-containing precipitate be snatched along with water going out of the tank.
  • some surface water which is already clarified, shall make an exit from a top section of the tank 12. The heavier- than-water precipitate descends to the tank's bottom.
  • Said lengthening of the water dwell time in the mixing container 4 also reduces the flow rate arriving in the settling tank 12. In this case, naturally, the flow rate out of the tank is also reduced, which decelerates the speed of outgoing water. A low rate of speed is another factor which further reduces a risk of precipitate being snatched along.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Cette invention concerne un appareil pouvant être fixé à une unité de purification de petite taille pour précipiter du phosphore à partir d'eau usée. Ledit appareil comprend un récipient de pompage (1), une pompe de décharge (2) pour décharger le récipient de pompage, un réservoir de produit chimique (6), une pompe de dosage de produits chimiques (5) pour distribuer un produit chimique à partir du réservoir de produit chimique (6) dans l'eau usée devant être déchargée à partir du récipient de pompage (1), grâce à quoi une séparation du précipité chimique résultant à partir de l'eau évacuée hors de l'unité de purification peut être accomplie dans un réservoir de sédimentation (12) de l'unité de purification de petite taille. Dans cette invention, la pompe de dosage (5) est conçue de façon à délivrer un coagulant chimique dans un flux d'effluent déchargé par la pompe de décharge (2) au cours de la totalité ou de la quasi-totalité d'un cycle de fonctionnement de la pompe de décharge (2).
PCT/FI2008/050409 2007-07-05 2008-07-03 Appareil et procédé pour précipitation de phosphore à partir d'eau usée WO2009004123A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2008800233610A CN101730664B (zh) 2007-07-05 2008-07-03 从污水中析出磷的设备和方法
RU2010103367/05A RU2480422C2 (ru) 2007-07-05 2008-07-03 Устройство осаждения фосфора из сточных вод
EP08775534A EP2164809A4 (fr) 2007-07-05 2008-07-03 Appareil et procédé pour précipitation de phosphore à partir d'eau usée

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075515A FI119148B (fi) 2007-07-05 2007-07-05 Laitteisto ja sen käyttö fosforin saostamiseksi jätevedestä
FI20075515 2007-07-05

Publications (1)

Publication Number Publication Date
WO2009004123A1 true WO2009004123A1 (fr) 2009-01-08

Family

ID=38331603

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/050409 WO2009004123A1 (fr) 2007-07-05 2008-07-03 Appareil et procédé pour précipitation de phosphore à partir d'eau usée

Country Status (5)

Country Link
EP (1) EP2164809A4 (fr)
CN (1) CN101730664B (fr)
FI (1) FI119148B (fr)
RU (1) RU2480422C2 (fr)
WO (1) WO2009004123A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248769A3 (fr) * 2009-04-27 2011-01-19 Fibox Oy Ab Procédé et dispositif de purification
ITCE20090009A1 (it) * 2009-09-29 2011-03-29 Luigi Antonio Pezone Sistemi integrativi al recupero alla defosforizzazione e prevenzione dell'idrogeno solforato delle acque di scarico domestiche
ES2397742A1 (es) * 2011-06-10 2013-03-11 Bioener Bierzo, S.L. Sistema para depurar aguas contaminadas y procedimiento de depuración.
ES2424777R1 (es) * 2012-01-13 2014-02-03 Bioener Bierzo, S.L. Sistema para depurar aguas contaminadas y procedimiento de depuración, mejorado.
US9260327B2 (en) 2011-06-10 2016-02-16 Bioner Bierzo, S.L. System for purifying polluted water and purification method
CN111982593A (zh) * 2020-08-07 2020-11-24 西华师范大学 一种水样防扰分装器

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JPH11216485A (ja) * 1998-02-03 1999-08-10 Hitachi Kiden Kogyo Ltd 活性汚泥法における凝集剤添加制御方法
JPH11262777A (ja) * 1998-03-17 1999-09-28 Hitachi Kiden Kogyo Ltd 汚水中のリン除去方法
JPH11300382A (ja) * 1998-04-21 1999-11-02 Hitachi Kiden Kogyo Ltd 汚水中のリン除去方法
FI7006U1 (fi) * 2005-03-15 2006-03-20 Raita Environment Ltd Oy Jäteveden käsittelylaitteisto

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Publication number Priority date Publication date Assignee Title
JPH0389993A (ja) * 1989-09-01 1991-04-15 Pub Works Res Inst Ministry Of Constr 排水のリン濃度制御方法
JPH11216485A (ja) * 1998-02-03 1999-08-10 Hitachi Kiden Kogyo Ltd 活性汚泥法における凝集剤添加制御方法
JPH11262777A (ja) * 1998-03-17 1999-09-28 Hitachi Kiden Kogyo Ltd 汚水中のリン除去方法
JPH11300382A (ja) * 1998-04-21 1999-11-02 Hitachi Kiden Kogyo Ltd 汚水中のリン除去方法
FI7006U1 (fi) * 2005-03-15 2006-03-20 Raita Environment Ltd Oy Jäteveden käsittelylaitteisto

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See also references of EP2164809A4 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248769A3 (fr) * 2009-04-27 2011-01-19 Fibox Oy Ab Procédé et dispositif de purification
ITCE20090009A1 (it) * 2009-09-29 2011-03-29 Luigi Antonio Pezone Sistemi integrativi al recupero alla defosforizzazione e prevenzione dell'idrogeno solforato delle acque di scarico domestiche
ES2397742A1 (es) * 2011-06-10 2013-03-11 Bioener Bierzo, S.L. Sistema para depurar aguas contaminadas y procedimiento de depuración.
US9260327B2 (en) 2011-06-10 2016-02-16 Bioner Bierzo, S.L. System for purifying polluted water and purification method
ES2424777R1 (es) * 2012-01-13 2014-02-03 Bioener Bierzo, S.L. Sistema para depurar aguas contaminadas y procedimiento de depuración, mejorado.
CN111982593A (zh) * 2020-08-07 2020-11-24 西华师范大学 一种水样防扰分装器

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Publication number Publication date
RU2480422C2 (ru) 2013-04-27
EP2164809A4 (fr) 2013-01-02
RU2010103367A (ru) 2011-08-10
FI20075515A0 (fi) 2007-07-05
CN101730664B (zh) 2012-10-17
EP2164809A1 (fr) 2010-03-24
FI119148B (fi) 2008-08-15
CN101730664A (zh) 2010-06-09

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