EP1307409A1 - Procede aux boues activees et dispositif de traitement des eaux usees avec elimination du phosphore et de l'azote - Google Patents

Procede aux boues activees et dispositif de traitement des eaux usees avec elimination du phosphore et de l'azote

Info

Publication number
EP1307409A1
EP1307409A1 EP01965496A EP01965496A EP1307409A1 EP 1307409 A1 EP1307409 A1 EP 1307409A1 EP 01965496 A EP01965496 A EP 01965496A EP 01965496 A EP01965496 A EP 01965496A EP 1307409 A1 EP1307409 A1 EP 1307409A1
Authority
EP
European Patent Office
Prior art keywords
zone
sludge
denitrification
anaerobic fermentation
activated
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.)
Withdrawn
Application number
EP01965496A
Other languages
German (de)
English (en)
Inventor
Ladislav Penzes
Juraj Csefalvay
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.)
BIOCLAR, A.S.
Original Assignee
BIOCLAR AS
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
Priority claimed from SK1176-2000A external-priority patent/SK11762000A3/sk
Application filed by BIOCLAR AS filed Critical BIOCLAR AS
Publication of EP1307409A1 publication Critical patent/EP1307409A1/fr
Withdrawn legal-status Critical Current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
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/902—Materials removed
    • Y10S210/903—Nitrogenous
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/902—Materials removed
    • Y10S210/906—Phosphorus containing

Definitions

  • the invention relates to a process for treating waste water with activated sludge in the suspended state for removing nitrogen and phosphorus and for simultaneous sludge stabilization and a continuously charged device for carrying out this process.
  • the device according to the invention consists of a compact wastewater purification reactor, which is used in particular for individual wastewater disposal, in which a activated space and post-clarified space are combined in an internal sludge circuit, the activated space containing an unventilated anaerobic fermentation zone and a denitrification zone and an aerated nitrification zone.
  • the lowest possible sludge load is required.
  • the aim is to work with as much activated sludge as possible in the activated sludge pool.
  • the known relatively flat reactors of small sewage treatment plants do not allow operation with very high sludge concentrations. If the concentration of activated sludge is higher, the sludge level in the post-clearance room is increased; with intensive suction of these sludges in the denitrification zone, however, an undesired introduction of dissolved oxygen into this zone is increased and the residence time of sludge under anoxic conditions is reduced.
  • the raw waste water from small water pollution sources contains many coarse Fabrics and is mostly loaded with fat.
  • the mechanical removal of coarse substances from the wastewater takes place in the dirt trap, which often works with ventilation (large bubbles), but this means that only a small part of the contaminants is crushed, especially with regard to the short residence time of wastewater in this part of the reactor.
  • Coarse dirt and organic substances that are difficult to decompose pass into other parts of the reactor and sometimes into the drain for purified water.
  • protection against the penetration of fat into the nitrification zone is not regulated, as a result of which the efficiency of the activation is reduced.
  • Maintaining the high sludge age and the high effectiveness of cleaning means that a high concentration of sludge can be achieved in the reactor, which is not possible in known reactors with the so-called fluid filtration.
  • the longer dwell time of sludge in the post-clarification room with fluid filtration causes the uncontrolled denitrification with the sludge being flushed out into the clear water zone.
  • the cleaning efficiency is lower, since the concentration of the dissolved oxygen decreases in the clarifying room. Excessive ventilation of the nitrification zone also leads to the flushing out of sludge, since sludge particles are adhered to Air bubbles are raised.
  • the rinsing and degassing of sludge is often achieved by suction at the level of the mirror with mammoth pumps into the nitrification zone, which increases the hydraulic load on the secondary clarification chamber and reduces the efficiency of the separation.
  • a degassing tank or a zone with ventilation can be placed in front of the post-clarification room, but this increases the investment costs.
  • the invention has for its object to provide a method and a device for biological wastewater treatment by means of the activated sludge process with nitrogen and phosphorus removal, avoiding the disadvantages of the prior art explained above, which has a high and stable effectiveness of cleaning and minimal investment and operating costs guaranteed.
  • This object is solved by the features of claim 1 and claim 3.
  • Fig. 1 is a plan view of a wastewater treatment reactor according to the invention
  • Fig. 2 is a section along the line A-A in Fig. 1
  • Fig. 3 is a section along the line B-B in Fig. 1 and
  • FIG. 4 shows a section along line C-C in FIG. 1.
  • the device for treating waste water by means of the activated sludge process for removing nitrogen and phosphorus according to the invention consists of a cylindrical waste water purification reactor with a bottom
  • Non-ventilated zones of a living space 5, 6 of the reactor are in the direction of flow through baffles 3 (in the figures with 3-3a, 3-3b, 3- 3c) and overflow walls 4 (in Figures 4-4a , 4-4b, 4-4c) divided in an alternating arrangement, whereby upflow and downflow chambers of an anaerobic fermentation zone 5 (in the figures with 5-5a, 5-5b, 5-
  • a vented nitrification zone 7 is separated from the anaerobic fermentation zone 5 by a partition 8 (designated 8-8a and 8-8c in the figures) and is only in the flow direction through the overflow wall with the denitrification zone 6
  • the baffles 3 are continuous through an opening 9 (Fig. 2) between the lower edge 10 and the bottom 1 along the entire wall width.
  • the overflow walls 4 are continuous over the overflow edge 1 1 along the entire wall width.
  • the first chamber 5a of the anaerobic fermentation zone 5 is equipped with a collecting device for coarse material in the waste water 23, which consists of a removable grating 24 and the partition walls 8b and 8c. Under the grating 24 there is an outflow opening 25 of a pipeline of the mammoth pump 18 which is below the water level, this pipeline running perpendicular to the grating 24.
  • the mammoth pump pumps the waste water / sludge mixture from the bottom of the last chamber 6b of the denitrification zone 6 via a suction inlet 26.
  • the nitrification zone 7 of the living space is separated from a post-clarification room 14 by two partially overlapping partitions 15, 16 in the form of a truncated half-cone, the post-clarification room 14 and living space 7 being connected by a connecting gap 17 which runs between the partitions 15, 16 and narrows.
  • the connecting gap 17 is located above the bottom of the container 1 along the entire width of the partition walls 15, 16.
  • At the bottom of the secondary clarification chamber 14 there is a suction opening 28 of the mammoth pump 19
  • the connecting gap between the activated and post-clarification rooms in the flow device gradually narrows, as a result of which the inflow of the wastewater / sludge mixture accelerates towards the bottom of the post-clarification room , the length of the gap should be at least four times its clear width in relation to the avoidance of turbulent flow.
  • the connecting gap between the living room and the Post-clearance is very advantageously formed between two partially overlapping, sloping partitions, which are set up at different angles to the bottom of the reactor or the partitions in the form of two partitions which partially snap in (in the form of inverted and obtuse cones or half-cones).
  • the lower partition acts as a rectifier of the flow caused by the ventilation of the oxic zone.
  • the connecting gap between the partitions directs the forced flow of the activated mixture towards the bottom of the secondary clarification room.
  • the clarifying room 14 there is a circulation and ventilation system for treating the clear water (in the form of the mammoth pump 20) at the level of the water, which suction and separation of the floating suspended substances from adhering air bubbles, the aeration of the clear water zone and the mixing of the precipitant to the sufficient Guaranteed removal of phosphorus.
  • Two suction inlets 29 (designated 29-29a and 29-29b in the figures) serve for this purpose, which run perpendicular to the water level 1 2 and open directly above the water level 1 2 in the clarifying chamber 14 (30).
  • a rectifier plate 31 is installed in the vicinity of the outlet mouth 30, the width of which has been selected such that it directs the flow of the upper layer of the clear water.
  • a mammoth pump 21 was installed, which is housed in the nitrification zone 7 and whose lower part, which is immersed in the wastewater / sludge mixture, is U-shaped.
  • a filter bag 35 (FIG. 3) is installed in the vicinity of the outlet mouth 34 and is housed on the grating 36 above the clarifying chamber 14.
  • a transverse collecting plate 37 for smoothing the flow of the separated sludge water back into the nitrification zone 7.
  • the mixing, the forced circulation, the recirculation of the waste water-sludge mixture and the clear water as well as the removal of the excess sludge are carried out with the aid of Mammoth pumps 1 8, 1 9, 20 and 21 guaranteed.
  • the aeration and maintenance of the activated mixture in the floating state within the nitrification zone 7 is carried out by a ventilation element (with fine bubbles) 22 at the bottom of the nitrification zone 7.
  • the required amount of pressure Air is introduced from a blower via pipelines into each part of the system (not shown in the figures), whereby the flow of compressed air can be regulated.
  • the operation of the individual recirculation and circulation pumps and the ventilation is ensured by a control unit (time switch or microprocessor) and by an on and off algorithm (continuous operation, intermittent operation, removal of excess sludge).
  • FIGS. 1, 2, 3 and 4 operates as follows:
  • the raw waste water runs into the first chamber 5a of the anaerobic fermentation zone 5, mechanical pre-cleaning taking place by means of the removable collecting device for coarse substances in the waste water 23.
  • Denitrification zone 6 mixed.
  • the hydrodynamic effect of the recirculated streams of the sewage-sludge mixture comminutes the coarse matter and ensures the forced circulation of the sewage-sludge mixture through all chambers of the anaerobic fermentation zone 5 and the denitrification zone 6 by applying the hydrostatic energy of the circulated sewage-sludge mixture and the recirculated return sludge.
  • the alternating arrangement of the diving walls 3 and overflow walls 4 ensures an upward and downward flow of the wastewater / sludge mixture and ensures that the activated sludge is kept in suspension and that the contents of the anaerobic fermentation zone 5 and that of the denitrification zone 6 are mixed , which leads to the fermentation and dissolution of the easily accessible organic substances which are bound in the cells of the phosphorus-accumulating bacteria.
  • the alternating arrangement of the diving walls 3 and overflow walls 4 ensures an upward and downward flow of the wastewater / sludge mixture and ensures that the activated sludge is kept in suspension and that the contents of the anaerobic fermentation zone 5 and that of the denitrification zone 6 are mixed , which leads to the fermentation and dissolution of the easily accessible organic substances which are bound in the cells of the phosphorus-accumulating bacteria.
  • Area of the opening between the lower edge of the baffle, the floor and the jacket of the reactor is dimensioned such that the minimum flow rate of the activated mixture of 10 cm / s at the bottom of the chamber is maintained when the recirculated, activated mixture and the return sludge flow through and the ratio between the plan area of the chamber and the surface of the overflow wall is at least 1: 4.
  • the wastewater / sludge mixture flows via the overflow wall 4-4b into the denitrification zone 6, where it is mixed with the recirculated return sludge from the post-treatment chamber 14.
  • the process of denitrification dominates in intermittent operation.
  • the wastewater-sludge mixture from the nitrification zone 7 flows through the connecting gap 17 into the clarifying chamber 14.
  • the suction opening 28 of the mammoth pump 19 for the suction and recirculation of the return sludge into the first chamber 6a of the denitrification zone 6, the mammoth pump ensuring the forced flow from the nitrification zone 7 into the secondary clarification chamber 14 due to the suction force.
  • the narrowing connecting gap 17 ensures the required flow rate and the direction of flow to eliminate the dead zones in the secondary clarification room 14.
  • a circulation pump for circulation and ventilation of the clear water is installed in the clear water zone, the suction opening and outlet of which are arranged near the water level in the clarifying room, taking into account the efficiency of the suction of the floating pollutants and floating substances as well as the splitting and removal of the adhering air bubbles, it is important that the suction port of the circulation pump is below the level of the clear water and the outlet port is above the water level, so that the entire top layer of the clear water zone remains in circulation in the post-clearance area.
  • Phosphorus can also be removed by means of a metering system with liquid precipitant (not shown in the figures), which opens into the pipeline system of the mammoth pump. Excess sludge and thus also the biologically and chemically bound phosphorus are removed automatically at least once a day by removing excess sludge in an oxy state using the mammoth pump 21. The excess sludge drawn off is dewatered in the filter bag 35, and the separated sludge water is brought back into the nitrification zone 7.
  • the activated sponge process with nitrogen and phosphorus removal and simultaneous sludge stabilization for the treatment of waste water according to the invention has the following steps:
  • the overflow walls between the anaerobic fermentation zone and the denitrification zone or between the denitrification zone and the nitrification zone have a restraining effect on the activated sludge flakes when the waste water / sludge mixture flows through them.
  • Construction of the wastewater treatment reactor ie the clear width of the The opening between the lower edges of the baffle walls and the bottom of the reactor and the ratio of the plan area of the chambers and the area of the overflow walls are determined by the intensity in the recirculation of the wastewater / sludge mixture into the anaerobic fermentation zone and in the
  • the dwell time and the concentration of the activated sludge in the anaerobic fermentation zone, the denitrification zone, the nitrification zone and the secondary clarification room within predetermined time intervals by means of defined time sequences corresponding to the daily fluctuations in the amount and pollution of wastewater are controlled automatically.
  • the process operation takes place with an average sludge concentration of 6-8kg / m 3 , which is higher than the optimal sludge concentration in the known activated sludge processes.
  • the wastewater-sludge mixture overflows into the nitrification zone 7.
  • the activated sludge is collected in the anaerobic fermentation zone 5 and the denitrification zone 6, also by briefly switching on the mammoth pump 19 during operation, which leads to the relocation of the activated sludge deposited in the clarifying room 14 during the standstill the first chamber 6a of the denitrification zone 6 is sufficient, the short-term mixing effect of the activation of the mammoth pump 19 being sufficient only to raise the sludge cloud in the anaerobic fermentation zone 5 and the denitrification zone 6; this means that wastewater overflows with little animated sludge, which can alternate the resting and running phases several times during this operation.
  • the activated sludge and waste water mixture overflows into the nitrification zone 7 via overflow walls 4-4b and 4-4c.
  • the activated sludge When operating the mammoth pumps 1 8, 1 9 and when ventilating with the aid of a low-power fan, the activated sludge is collected in the anaerobic fermentation zone 5 and the denitrification zone 6. It has an influence on the fact that the reduced flow rate of the return sludge is only sufficient to lift off the sludge cloud in the anaerobic fermentation zone 5 and the denitrification zone 6; this is what happens low overflow of the activated sludge over overflow walls 4-4b and 4-4c, whereby the operation of the blowers with lower and higher output can occur several times during the day.
  • the method and the device according to the invention lead to numerous advantages.
  • One of the most important advantages is the adaptation of the daily operation of the reactor to daily fluctuations in wastewater production and pollution, which, in addition to the reduction in energy costs, also cyclical changes in the sludge concentration in the anaerobic fermentation zone 5, the
  • Denitrification zone 6 and nitrification zone 7 ensured.
  • the intermittent operation occurs, in which the sludge is accumulated in the anaerobic fermentation zone 5 and the denitrification zone 6.
  • the clarifying room 14 there is only purified water with a low sludge level and a low content of floating substances and contaminants in the sewage water (nitrates, ammonia nitrogen, phosphorus).
  • the incoming raw wastewater drives the cleaned wastewater out of the reactor, since the mixing of the individual zones is restricted. At the same time, protection from the surge inflow becomes a larger one
  • the application of the method according to the invention enables a reduction in the investment and operating costs for the purification of wastewater while at the same time reducing the operating effort, which makes this individual solution for wastewater treatment attractive even under conditions in which wastewater treatment is not possible for economic or technical reasons Removal of
  • Waste water in a sewer system and in a central sewage treatment plant Waste water in a sewer system and in a central sewage treatment plant.
  • Another great advantage of the method according to the invention lies in the use for removing nitrogen and phosphorus from waste water; Therefore, these sewage treatment plants can also be used for discharging into surface water in areas in which eutrophication of surface water threatens.
  • the method according to the invention described here can also be used in wastewater treatment plants of different sizes.

Abstract

L'invention concerne un dispositif et un procédé de traitement des eaux usées par des boues activées en suspension, pour l'élimination de l'azote et du phosphore avec stabilisation simultanée des boues. Il est prévu une chambre d'activation (5, 6) comprenant une zone de fermentation (5) et une zone de dénitrification (6), ainsi qu'une zone de nitrification (7), la zone de fermentation (5) et la zone de dénitrification (6) de la chambre d'activation (5, 6) étant séparées, dans le sens d'écoulement, par des cloisons plongeantes (3) et des murs déversants (4), permettant ainsi de former des chambres d'écoulement descendant et ascendant dans la zone de fermentation anaérobie (5) et la zone de dénitrification (6). Le temps de séjour et la concentration des boues activées dans la zone de fermentation anaérobie (5), la zone de dénitrification (6), la zone de nitrification (7) et dans le bassin de décantation finale (14) peut être contrôlé en modifiant l'intensité de recirculation du mélange effluents-boues dans la zone de fermentation anaérobie, et de la recirculation des boues recyclées dans la zone de dénitrification, ou en alternant le fonctionnement en régime intermittent continu, et en régime courte durée, de la recirculation dans des intervalles de temps prédéterminés, tout en suivant des séquences temporelles pré-établies (correspondant aux variations diurnes présumées des quantités de matières polluantes et d'effluents).
EP01965496A 2000-08-03 2001-07-31 Procede aux boues activees et dispositif de traitement des eaux usees avec elimination du phosphore et de l'azote Withdrawn EP1307409A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SK1176-2000A SK11762000A3 (sk) 2000-08-03 2000-08-03 Spôsob čistenia odpadových vôd aktivačným procesom s odstraňovaním dusíka a fosforu
SK117600 2000-08-03
SK251002000 2000-08-03
SK2512000 2000-08-03
PCT/IB2001/001368 WO2002012133A1 (fr) 2000-08-03 2001-07-31 Procede aux boues activees et dispositif de traitement des eaux usees avec elimination du phosphore et de l'azote

Publications (1)

Publication Number Publication Date
EP1307409A1 true EP1307409A1 (fr) 2003-05-07

Family

ID=34437071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01965496A Withdrawn EP1307409A1 (fr) 2000-08-03 2001-07-31 Procede aux boues activees et dispositif de traitement des eaux usees avec elimination du phosphore et de l'azote

Country Status (5)

Country Link
US (1) US6773596B2 (fr)
EP (1) EP1307409A1 (fr)
AU (1) AU2001286133A1 (fr)
PL (1) PL365164A1 (fr)
WO (1) WO2002012133A1 (fr)

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US20090008324A1 (en) * 2004-04-28 2009-01-08 Long Dennis J Intermittent anaerobic biological treatments of rainfall-induced sewerage
AU2006284174B2 (en) * 2005-08-22 2010-06-03 Juraj Csefalvay Waste water purifying device
AU2009266304B2 (en) * 2008-07-02 2014-11-27 Ciris Energy, Inc. Method for optimizing in-situ bioconversion of carbon-bearing formations
JP5841948B2 (ja) 2009-12-18 2016-01-13 シリス エナジー，インコーポレイテッド 石炭のバイオガス化によりメタン及び他の有用な製品を生成する方法
PL2766313T3 (pl) 2011-09-08 2017-01-31 Péter Schuster Małe urządzenie biologiczne do oczyszczenia ścieków z powiększoną efektywnością
SK7883Y1 (sk) * 2015-04-28 2017-09-04 Penzes Ladislav Spôsob a zariadenie na čistenie odpadových vôd aktivačným procesom so zvýšeným odstraňovaním dusíka a fosforu
CN107540084A (zh) * 2016-06-23 2018-01-05 帕克环保技术(上海)有限公司 厌氧发酵反应装置
CN110467263B (zh) * 2019-08-23 2021-09-03 广州鹏凯环境科技股份有限公司 一种同步短程硝化反硝化水处理装置及工艺
US11851356B2 (en) 2020-01-06 2023-12-26 The Research Foundation For The State University Of New York Bioreactor system and method for nitrification and denitrification

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Also Published As

Publication number Publication date
US6773596B2 (en) 2004-08-10
AU2001286133A1 (en) 2002-02-18
US20030183572A1 (en) 2003-10-02
WO2002012133A1 (fr) 2002-02-14
PL365164A1 (en) 2004-12-27

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