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WO2016048151A1 - Procédé et système de traitement d'un écoulement de fluide - Google Patents

Procédé et système de traitement d'un écoulement de fluide Download PDF

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Publication number
WO2016048151A1
WO2016048151A1 PCT/NL2015/050665 NL2015050665W WO2016048151A1 WO 2016048151 A1 WO2016048151 A1 WO 2016048151A1 NL 2015050665 W NL2015050665 W NL 2015050665W WO 2016048151 A1 WO2016048151 A1 WO 2016048151A1
Authority
WO
WIPO (PCT)
Prior art keywords
reactor vessel
fluid
fluid flow
oxygen
supply
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.)
Ceased
Application number
PCT/NL2015/050665
Other languages
English (en)
Inventor
Aad WUBBEN
Lex VAN DER ENDE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aqua-Terra Nova BV
VAN DER ENDE POMPEN BV
Original Assignee
Aqua-Terra Nova BV
VAN DER ENDE POMPEN BV
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 Aqua-Terra Nova BV, VAN DER ENDE POMPEN BV filed Critical Aqua-Terra Nova BV
Priority to EP15808475.6A priority Critical patent/EP3197837A1/fr
Publication of WO2016048151A1 publication Critical patent/WO2016048151A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C02F3/04—Aerobic processes using trickle filters
    • 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
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • 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
    • C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/36—Biological material, e.g. enzymes or ATP
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • 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
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/104—Granular carriers
    • 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 present invention relates to a method and system for treating a fluid flow, particularly for irrigation in substrate culture.
  • chloride As alternative or additional measure it is known to use chloride to treat the fluid flow. This is however not the desired solution for the horticultural industry since it is in many cases not desirable to apply chemicals, wherein the danger arises of exceeding chloride values, which can have the result that the products may not be sold.
  • This object is achieved with a method according to the appended claim 1.
  • This object is more particularly achieved with a method for treating a fluid flow, particularly for irrigation in substrate culture, comprising the steps of:
  • Carrying the fluid flow, in which micro-organisms which decompose organic material are present, through a reactor vessel creates an outgoing fluid flow with low concentrations of these organic nutrients, so that the multiplication of harmful bacteria still possibly present, for instance in this fluid flow, is limited.
  • supplying oxygen to the reactor vessel has the additional advantage that the outgoing fluid flow also comprises high concentrations of oxygen and is preferably saturated with oxygen.
  • the multiplication and action of anaerobic bacteria still possibly present in this fluid flow, and for instance further downstream in the conduits and the substrates, is then combatted by these high concentrations of oxygen. Oxygen also ensures a better (root) growth.
  • the outgoing fluid flow according to the invention preferably comprises a substantial concentration of the micro-organisms present in the reactor vessel. Without being limited to this theory it is assumed that, by providing a fluid flow having therein micro-organisms not harmful to cultivation, this fluid flow is less susceptible to infection with potentially harmful bacteria.
  • the fluid flow coming from the reactor vessel is therefore preferably low in organic material, comprises high concentrations of oxygen and comprises some concentrations of micro-organisms from the reactor vessel.
  • the reactor vessel is preferably embodied as upright cylinder comprising a quantity of carrier material, for instance in the form of clay granules, which form a favourable habitat for the microorganisms.
  • the fluid flow to be treated is carried into the reactor vessel so that an aqueous environment is created therein for at least a part of the carrier material, so that the micro-organisms present thereon can decompose the organic material in that fluid flow.
  • carrying the fluid flow through the reactor vessel comprises of spraying the fluid flow onto the granular material from the upper side.
  • the fluid is preferably sprayed over the largest possible, preferably the whole, surface area of the reactor vessel so as to thus make the active surface area as large as possible.
  • the fluid flow to be treated then preferably flows from the top downward into the reactor vessel.
  • the outlet for the fluid flow is preferably located on or close to the underside of the reactor vessel. If the fluid remains for a sufficiently long time in the reactor vessel, substantially all the organic material present is preferably decomposed therein.
  • the method also comprises of controlling the supply and/or discharge of fluid into or out of the reactor vessel for the purpose of maintaining a predetermined fluid level in the reactor vessel, wherein the predetermined fluid level is lower than the filling height of the granular carrier material in the reactor vessel. It is advantageous here that not all the granular carrier material lies below the fluid level in the reactor vessel, so that an environment is created above this fluid level which, although wet, is very oxygen-rich. This combination of environments produces an improved operation of the reactor vessel.
  • the supply and discharge of the fluid to and from the reactor vessel is then controlled such that the fluid level in the reactor vessel is adjusted to a predetermined fluid level, or preferably falls within a predetermined range of the fluid level.
  • the method In order to prevent the biological activity in the reactor vessel decreasing too much, for instance due to excessive discharge of micro-organisms from this reactor vessel, it is advantageous for the method to also comprise the step of controlling the supply and/or discharge of fluid into or out of the reactor vessel for the purpose of maintaining a predetermined minimal biological activity in the reactor vessel. This ensures a minimal quantity of micro-organisms present in the reactor vessel which can serve to maintain a resistant population. Measurement of the biological activity can for instance take place by measuring the organic material still present in the outlet, which is then indicative of the effectiveness and thereby the biological activity in the reactor vessel.
  • the method also comprises of measuring a pressure difference, in particular changes thereof, over a filter located downstream of the outlet.
  • a measured pressure difference over this filter increases rapidly, this is an indication that the filter is becoming clogged more quickly due to an excessive quantity of micro-organisms detaching from the carrier material.
  • the supply and/or discharge of fluid into or out of the reactor vessel can be modified in order to combat the rapid decrease in biological activity.
  • Measurement of the biological activity can however also take place by measuring the oxygen concentration in the reactor vessel, preferably close to the upper side thereof. Now that the oxygen is preferably supplied close to the underside of the reactor vessel, the decrease in the oxygen concentration relative to a predetermined level on the upper side is an indication of the biological activity of the micro-organisms.
  • the predetermined level can be determined on the basis of the quantity of oxygen added. If the measured oxygen concentration falls below a predetermined level, the supply and/or discharge of the fluid flow can then be modified such that the fluid with microorganisms for instance remains present for longer in the reactor vessel for the purpose of further multiplication. It is also possible for the quantity of oxygen in ingoing and outgoing flows to be measured in order to determine an indication of the biological activity.
  • control of the supply and/or discharge can take place by controlling the flow rates of the supply and/or discharge by means of suitable valves, it is advantageous for the control to comprise of feeding a quantity of fluid from the outlet back to the inlet.
  • the feedback conduit is situated here between the outlet of the reactor vessel and an outfeed for outfeed of the treated water, for instance to the irrigation system.
  • the quantity of fluid which is fed back via the feedback conduit can for instance be controlled using a valve to this outfeed. It is advantageous here that the filter with pressure difference measurement as described above is incorporated into the feedback conduit.
  • the supply of fluid into the reactor vessel is preferably maintained at a minimal flow rate, and the supply is more preferably maintained at a predetermined flow rate.
  • the method also comprises the step of feeding a quantity of fluid from the outlet back to the inlet of the reactor vessel such that the supply of fluid reaches that predetermined flow rate. If the fluid flow provided is not sufficient to reach this flow rate, this fluid flow is supplemented with the fluid flow coming from the reactor vessel. It is for instance possible for this purpose to control the valve to the outfeed as described above such that the flow rate of the supply remains substantially constant.
  • the micro-organisms comprise nitrifying soil bacteria.
  • the granular carrier material comprises clay granules.
  • Such material forms a good substrate for the micro-organisms.
  • Geo-hydro granules 8-16, particularly with a weight of about 350 kg/m 2 are for instance suitable.
  • the carrier material preferably in the form of clay granules, preferably has a large specific surface area so that the contact area with the fluid to be treated is large.
  • the carrier material more preferably has a specific surface area greater than 600 m 2 /m 3 .
  • the invention also relates to a method for irrigating at least one substrate in the substrate culture, comprising the steps of treating a fluid flow according to the invention and irrigating the substrate with the treated fluid flow.
  • the loss of crops during cultivation is thus combatted. It should be noted here that it is not strictly necessary to supply the fluid flow coming from the reactor vessel directly to the substrate for irrigation thereof. It is for instance possible to first store the treated water in a suitable reservoir and then supply it, when necessary, to the substrate via per se known irrigation systems.
  • the invention also relates to a system for treating a fluid flow according to the invention, particularly for irrigation in substrate culture, comprising:
  • reactor vessel between the infeed and outfeed, wherein the reactor vessel is configured to hold granular carrier material for micro-organisms and wherein the reactor vessel comprises an inlet coupled to the infeed, an outlet coupled to the outfeed, a feed for oxygen which is configured to supply oxygen to the reactor vessel;
  • An incoming fluid flow can be treated efficiently with such a system for the potpose of obtaining a fluid flow which is preferably rich in oxygen, low in organic material and which comprises microorganisms from the reactor vessel.
  • the pump and/or the control system are configured here to modify the flows in the system such that sufficient decomposition of organic material is achieved and the oxygen concentration in the water is sufficiently high.
  • the reactor vessel comprises at least one sensor for measuring the fluid level in the reactor vessel. The control system can then be adjusted on the basis of the measurements from this sensor for the purpose of maintaining the fluid level in the reactor vessel.
  • the reactor vessel preferably comprises a plurality of sensors, which can for instance detect an upper and a lower limit of the water level, subject to which the control system and/or the pump can adjust the water level in the reactor vessel.
  • the sensors can for instance comprise floats.
  • the system preferably also comprises a feedback conduit between the outlet of the reactor vessel and the inlet of the reactor vessel.
  • the control system is preferably configured here to control the fluid flow through the feedback conduit, for instance by adjusting the flow rate with a suitable valve and/or adjusting the power and/or frequency of the pump.
  • the system comprises a flow rate sensor for measuring the flow rate of the supply of fluid into the reactor vessel, wherein the control system is configured to feed a large quantity of fluid from the outlet back to the inlet such that the supply of fluid reaches a predetermined flow rate. This ensures sufficient supply of fluid into the reactor vessel to sustain the wet environment above the fluid level in the reactor vessel.
  • the feed of oxygen is located close to the underside of the reactor vessel and wherein the reactor vessel comprises close to the upper side an oxygen sensor which is configured to measure the oxygen concentration, and wherein the control system is configured to control supply and/or discharge of fluid into or out of the reactor vessel for the purpose of maintaining a predetermined minimal biological activity in the reactor vessel.
  • the control system is configured to control supply and/or discharge of fluid into or out of the reactor vessel for the purpose of maintaining a predetermined minimal biological activity in the reactor vessel.
  • a filter is preferably provided downstream of the outlet, wherein pressure sensors are provided for measuring a pressure difference, particularly changes thereof, over this filter.
  • the control system can be provided for this purpose with suitable processing means.
  • the supply and/or discharge of fluid into or out of the reactor vessel can be modified to combat the rapid decrease in biological activity.
  • the filter is preferably placed in the feedback conduit.
  • Figures 1 and 2 show a treatment system 100 for treating a water flow coming from a conduit 7.
  • this conduit is coupled to the outlet for discharging water from growth substrates.
  • the treated water is discharged to an outfeed 9 for further storage in silo 9a, after which it can be used to irrigate substrates in substrate culture with a per se known irrigation system 10.
  • the system comprises an upright cylindrical reactor vessel 1 which in this embodiment has a diameter of 120 cm and a height of 300 cm. Received in the reactor vessel are granules D, only the upper edge of which is shown schematically.
  • the granules are geo-hydro granules 8-16 with a weight of 350 kg per m 2 .
  • the water is distributed over the granules D by pump U via a conduit 2 from the upper side of reactor vessel 2 by means of a sprayer 21, optionally after a UV treatment.
  • the sprayer has a flow rate of 16 m 3 per hour.
  • an outlet 3 which via a system pump 4 and valve 5 can discharge the treated water via outfeed 9.
  • the flow rate of sprayer 21 is determined using pressure gauge P2. In order to ensure that the granular material D, particularly in the upper side of reactor vessel 1, stays sufficiently wet it is important that the flow rate of sprayer 21 is kept as constant as possible, or at least does not drop below a predetermined limit value, in this embodiment 1 m 3 per hour.
  • a feedback conduit 6 which runs between outlet 3, downstream of pump 4, and inlet conduit 2.
  • the flow rate through feedback conduit 6 can be determined by adjusting, by means of opening and/or closing, of valve 5 arranged between discharge conduit 3 and outfeed 9.
  • pressure sensor P2 measures an increased pressure, which is indicative of an increased flow rate of sprayer 21
  • valve 5 can be opened further so that more treated water can be pumped to outfeed 9 and the supply from conduit 6 decreases. The production of system 100 is then optimal.
  • system 100 it is even possible here for system 100 to operate without any discharge of water in the system, wherein the water is circulated constantly via inlet 2, outlet 3 via pump 4 and feedback conduit 6. In order to prevent too low a water level as a result of evaporation, suppletion of water also takes place during this recirculation. Such a recirculation can be particularly important when starting up the system, as will be discussed in more detail below.
  • the water level designated with the letter W and only the water surface of which is shown in the figure, remains within a predetermined range.
  • two floats NO are arranged at heights of respectively 80 cm and 120 cm above the underside of reactor vessel 1. These floats act as sensors for determining the water level in reactor vessel 1 , wherein the water level has to remain between these two sensors.
  • the water level in reactor vessel 1 can be adjusted within this desired range by modifying the frequency of system pump 4. When the water level is too high, wherein upper sensor NO measures water, the frequency of the system pump can for instance be increased, while in the case of a measurement by the lower sensor NO the frequency of system pump 4 can be reduced, whereby the water level will rise again.
  • a sensor LHH which determines the maximum water level in the reactor vessel. In the case of a signal from this sensor the system will be switched off. Also incoiporated into discharge conduit 3 is a sensor LLL, which detects whether water is flowing through this conduit. If no water is detected, the system will once again switch off automatically.
  • Present in the reactor vessel is a broad population of (nitrifying soil) bacteria, which decompose organic material when oxygen is supplied. The clay granules serve here as carrier material for these bacteria and provide a very large active surface area for these bacteria. Organic substances present in the fluid flow are decomposed through the agency of these bacteria.
  • an oxygen feed 11 which supplies a flow of oxygen to the reactor vessel using a pump, is provided on the underside of reactor vessel 1.
  • 30 m 3 is supplied to reactor vessel 1 per hour at 0.2 bar.
  • the system can for this purpose be set to the recirculation position, which means that the system circulates the water via feedback conduit 6 in order to ensure that no bacteria are discharged via outfeed 9.
  • a filter 13 with pressure sensors 14 on either side thereof is moreover arranged in feedback conduit 6. These pressure sensors 14 measure the pressure difference over filter 13 and, if a rapid decrease in the pressure difference over filter 13 is detected, this is an indication that a large quantity of micro-organisms are being released from the reactor vessel. In order to maintain the population in the reactor vessel the discharge from the vessel can limited so that the population can recover by way of multiplication.
  • the outflow from outfeed 9 is determined by the position of valve 5, which is determined subject to the pressure measurement by sensor P2.
  • Organic material is substantially wholly removed from the fluid flow at outfeed 9 by the filtering action of the reactor vessel since this material has been decomposed by the bacteria on carrier material B.
  • the supply of oxygen for the oxygen supply system 11 is moreover so great that the water from outfeed 9 is substantially wholly saturated with oxygen.
  • An additional advantage is that bacteria will also be flushed out of reactor vessel 1 so that the water in outfeed 9 also comprises a certain concentration of bacteria. This combination of factors produces a fluid flow which is highly suitable for irrigating substrates in substrate culture, wherein infection by harmful bacteria is precluded as far as possible.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

L'invention concerne un procédé de traitement d'un écoulement de fluide, en particulier pour l'irrigation dans une culture sur substrat, comprenant les étapes consistant à : générer un écoulement de fluide; faire passer ensuite l'écoulement de fluide dans une cuve de réacteur, l'oxygène étant acheminé vers la cuve de réacteur, cette dernière comprenant des micro-organismes sur un matériau support granulaire qui décomposent le matériau organique dans l'écoulement de fluide lorsque l'oxygène est acheminé vers la cuve de réacteur; et évacuer de la cuve de réacteur un écoulement de fluide riche en oxygène comprenant des micro-organismes.
PCT/NL2015/050665 2014-09-26 2015-09-24 Procédé et système de traitement d'un écoulement de fluide Ceased WO2016048151A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15808475.6A EP3197837A1 (fr) 2014-09-26 2015-09-24 Procédé et système de traitement d'un écoulement de fluide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2013528 2014-09-26
NL2013528 2014-09-26

Publications (1)

Publication Number Publication Date
WO2016048151A1 true WO2016048151A1 (fr) 2016-03-31

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ID=54849681

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2015/050665 Ceased WO2016048151A1 (fr) 2014-09-26 2015-09-24 Procédé et système de traitement d'un écoulement de fluide

Country Status (2)

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EP (1) EP3197837A1 (fr)
WO (1) WO2016048151A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824446A1 (de) * 1978-06-03 1979-12-06 Davy Bamag Gmbh Verfahren zur nitrifikation von abwaessern mit hilfe eines tropfkoerpers
DE4403716C1 (de) * 1994-02-07 1995-03-16 Hahnewald Gmbh Chemisch Physik Verfahren und Reaktor zur mikrobiologischen Wasserbehandlung mit hohem Sauerstoffbedarf
WO2003042114A1 (fr) * 2001-11-14 2003-05-22 Dharma Living Systems, Inc. Systemes de traitement des eaux usees integres, par hydroponie et sur couche fixe et procedes associes
EP1484287A1 (fr) * 2002-02-01 2004-12-08 Universidade De Santiago De Compostela Reacteur biologique hybride de membranes pour le traitement d'eaux residuelles industrielles et urbaines
EP2319808A2 (fr) * 2009-10-08 2011-05-11 DAS Environmental Expert GmbH Procédé pour le traitement de l'eau
CN103819057A (zh) * 2014-03-05 2014-05-28 东南大学 一种污水安全灌溉的资源化方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824446A1 (de) * 1978-06-03 1979-12-06 Davy Bamag Gmbh Verfahren zur nitrifikation von abwaessern mit hilfe eines tropfkoerpers
DE4403716C1 (de) * 1994-02-07 1995-03-16 Hahnewald Gmbh Chemisch Physik Verfahren und Reaktor zur mikrobiologischen Wasserbehandlung mit hohem Sauerstoffbedarf
WO2003042114A1 (fr) * 2001-11-14 2003-05-22 Dharma Living Systems, Inc. Systemes de traitement des eaux usees integres, par hydroponie et sur couche fixe et procedes associes
EP1484287A1 (fr) * 2002-02-01 2004-12-08 Universidade De Santiago De Compostela Reacteur biologique hybride de membranes pour le traitement d'eaux residuelles industrielles et urbaines
EP2319808A2 (fr) * 2009-10-08 2011-05-11 DAS Environmental Expert GmbH Procédé pour le traitement de l'eau
CN103819057A (zh) * 2014-03-05 2014-05-28 东南大学 一种污水安全灌溉的资源化方法

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Publication number Publication date
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