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WO2000071474A2 - Procede de purification biologique d'eaux usees a faible teneur en matiere nutritive et appareil de mise en application de ce procede - Google Patents

Procede de purification biologique d'eaux usees a faible teneur en matiere nutritive et appareil de mise en application de ce procede Download PDF

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Publication number
WO2000071474A2
WO2000071474A2 PCT/NL2000/000319 NL0000319W WO0071474A2 WO 2000071474 A2 WO2000071474 A2 WO 2000071474A2 NL 0000319 W NL0000319 W NL 0000319W WO 0071474 A2 WO0071474 A2 WO 0071474A2
Authority
WO
WIPO (PCT)
Prior art keywords
waste water
nutrient
aqueous flow
low
sludge
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/NL2000/000319
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English (en)
Other versions
WO2000071474A3 (fr
Inventor
David Leo Joseph Vertegaal
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.)
KWA BEHEER BV
Original Assignee
KWA BEHEER 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 KWA BEHEER BV filed Critical KWA BEHEER BV
Priority to AU46279/00A priority Critical patent/AU4627900A/en
Publication of WO2000071474A2 publication Critical patent/WO2000071474A2/fr
Anticipated expiration legal-status Critical
Publication of WO2000071474A3 publication Critical patent/WO2000071474A3/fr
Ceased legal-status Critical Current

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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
    • C02F3/00—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a method for biologically purifying waste water having a low nutrients content, wherein a high-nutrient aqueous flow is added to the low-nutrient waste water.
  • the present invention furthermore relates to an apparatus for biologically purifying waste water having a low nutrients content.
  • a method of this kind is known per se from German patent
  • a method for the biological processing of waste water flows containing colorants from textile and leather industries is furthermore known from German Offenlegungsschrift No. 19716939, according to which method waste water of human or animal origin is used as a nutrients source in the aerobic purification of industrial waste water.
  • US patent No. 3,943,055 relates to a method for purifying industrial waste flows containing perchlorate and dichlorate compounds, wherein intermixing with household waste water takes place with a view to the anaerobic decomposition of said compounds, which household waste water can be considered to be an organic co-substrate rather than a nutrients source.
  • US patent No. 5,637,210 relates to a method of reducing the percentage of water-soluble metal ions, wherein a porous matrix is placed in the aqueous flow to be treated. Said matrix is inoculated in advance with aerobic metal oxidizing bacteria, which convert the metal ions into insoluble metal oxides, which remain behind on the porous matrix.
  • the object of the present invention is to provide a method for biologically purifying waste water having a low nutrients content, wherein the lack of nutrients is eliminated in a simple manner.
  • Another object of the present invention is to provide a method and an apparatus for biologically purifying waste having a low nutrients content, wherein the lack of nutrients is eliminated by advantageously utilizing residual flows from water purification plants.
  • the method as referred to in the introduction is according to the present invention characterized in that the high-nutrient aqueous flow comes from a different source than the low-nutrient waste water, which high-nutrient aqueous flow is in particular obtained from sludge processing for releasing nutrients and which has been cleared of sludge before the addition of the high-nutrient aqueous flow takes place.
  • the high-nutrient aqueous flow comes from a different source than the low-nutrient waste water, which high-nutrient aqueous flow is in particular obtained from sludge processing for releasing nutrients and which has been cleared of sludge before the addition of the high-nutrient aqueous flow takes place.
  • the high-nutrient aqueous flow which is used in the present invention can be considered as the rejection water from the sludge processing following sludge treatment and sludge/water separation.
  • the term nutrients is understood to refer mainly to nitrogen and phosphate compounds. Said nitrogen and phosphate compounds are in particular necessary for the biological conversion processes which take place in the waste water.
  • the terms low-nutrient and high-nutrient which are used in the present application are based on the ratio between the organic compounds present in the unpurified waste water (measured as chemical oxygen demand, COD, in accordance with the usual standard) and the nutrient (nitrogen ( ⁇ ) and/or phosphate (P) compounds.
  • the ratio COD/ ⁇ in a high-nutrient aqueous flow is preferably ⁇ 5 in a filtered sample and/or the ratio COD/P is ⁇ 40, preferably ⁇ 20.
  • the amount of ⁇ (mg/1) is preferably > 100 mg/1
  • the amount of P (mg/1) is preferably > 10 mg/1.
  • the low-nutrient waste water has been discharged by an industrial enterprise.
  • industrial waste water is understood to mean waste water which is discharged as part of the production processes which take place within an enterprise.
  • the present invention is not limited to industrial waste water, however, but it is directed at restoring the nutrients balance in an aqueous flow by using a high-nutrient aqueous flow from a different source.
  • the waste water thus obtained is generally identified by a low nutrients content in relation to the amount of organic compounds.
  • the low-nutrient waste water is purified in an aerobic biological purification plant for industrial waste water or in an anaerobic biological purification plant for industrial waste water. It is furthermore preferable for the high-nutrient aqueous flow to originate from a purification plant for household waste water.
  • Household waste water of this kind is generally collected and purified in a communal sewage water purification plant.
  • This type of waste water is identified by a relatively high nutrients content in relation to the organic compounds (carbon compounds such as starch, fats, sugars and the like), viz. in particular a low COD/N ratio.
  • the compounds present in the household waste water are converted into carbon dioxide gas, nitrogen gas and bacterial sludge during the biological purification process.
  • the aforesaid impurities have been removed from the thus purified waste water, whereby part of the impurities are present in the sludge, however.
  • the organic compounds in the sludge are converted into gaseous compounds. It is in particular preferable to subject the sludge to an anaerobic treatment, in particular an anaerobic fermentation process, wherein the organic sludge mass is converted into methane gas and wherein the nutrients are released from the sludge.
  • anaerobic treatment in particular an anaerobic fermentation process, wherein the organic sludge mass is converted into methane gas and wherein the nutrients are released from the sludge.
  • a mixture of water, residual sludge and dissolved nitrogen and phosphate compounds is obtained from such an anaerobic treatment.
  • a wet oxidation process such as a wet oxidation process, during which oxygen is supplied, causes the organic sludge mass to decompose into carbon dioxide. Nutrients are released from the sludge during such a treatment, after which a mixture of water, residual sludge and dissolved nitrogen and phosphate compounds is obtained.
  • the essence of the present invention is to use said flow of supernatant from purification plants for household waste water as a nutrients source for waste water which has been discharged by an industrial enterprise, in which waste water there is a lack of nutrients.
  • the aqueous phase of the residual sludge can be separated for reuse, whereby a high-nutrient supernatant flow is formed.
  • thickening techniques can be used for carrying out this process, such as gravitation thickening, flotation thickening and belt thickening.
  • a high- nutrient water fraction is obtained from such a thickening treatment, as well as a sludge fraction which is likewise rich in nutrients.
  • the sludge can be additionally subjected to a dewatering treatment, for example by centrifugation, belt pressing, filter pressing and evaporation and drying. This leads to a higher yield of supernatant.
  • the presence of sludge residue in the remaining supernatant can be further reduced by separating the residual sludge in the supernatant from the water fraction, for example by settling, flotation and filtration.
  • the present invention is not limited to such a pre- treatment, however.
  • the high-nutrient aqueous flow is in particular used for processes wherein the composition of the waste water is unbalanced, in particular wherein the waste water exhibits a lack of nutrients.
  • Such a situation in particular applies with waste water which has been discharged by an industrial enterprise, wherein it should be noted, however, that type of waste water exhibiting a lack of nutrients can be used according to the present invention.
  • the nutrients which are present in a large amount in an aqueous flow are then transferred to a plant where there is a lack of such nutrients.
  • the transport takes place by means of transmission lines, ships and tank trucks, for example.
  • the high-nutrient aqueous flow will be supplied via a pipe, wherein it is furthermore preferable to supply the high-nutrient aqueous flow to a buffer vessel, whereby the high-nutrient aqueous flow is supplied via a discharge pipe to the low-nutrient waste water as needed.
  • the present invention furthermore relates to an apparatus for biologically purifying waste water having a low nutrients content, which apparatus is characterized in that the pipe for waste water having a low nutrients content is connected to a pipe for a high-nutrient aqueous flow.
  • the pipe for the hi gh- nutrient aqueous flow is connected to a buffer vessel, which buffer vessel is connected, via a drain pipe, to the pipe for waste water having a low nutrients content.
  • a buffer vessel which buffer vessel is connected, via a drain pipe, to the pipe for waste water having a low nutrients content.
  • the return sludge pipe which pipe returns sludge from the sludge/water separation to the biological purification plant.

Landscapes

  • 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)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

L'invention concerne un procédé de purification biologique des eaux usées présentant une faible teneur en matières nutritives, dans lequel un flux aqueux à teneur élevée en matières nutritives est ajouté aux eaux usées à faible teneur en matières nutritives, le flux aqueux à teneur élevée en matières nutritives venant d'une source différente de celle des eaux usées à faible teneur en matières nutritives, ainsi qu'un appareil de purification biologique d'eaux usées présentant une faible teneur en matières nutritives.
PCT/NL2000/000319 1999-05-21 2000-05-12 Procede de purification biologique d'eaux usees a faible teneur en matiere nutritive et appareil de mise en application de ce procede Ceased WO2000071474A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46279/00A AU4627900A (en) 1999-05-21 2000-05-12 Method for biologically purifying waste water having a low nutrients content, aswell as apparatus for carrying out such a method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1012130A NL1012130C2 (nl) 1999-05-21 1999-05-21 Werkwijze voor het biologisch zuiveren van afvalwater dat een gering gehalte nutriÙnten bezit, alsmede inrichting voor het uitvoeren van een dergelijke werkwijze.
NL1012130 1999-05-21

Publications (2)

Publication Number Publication Date
WO2000071474A2 true WO2000071474A2 (fr) 2000-11-30
WO2000071474A3 WO2000071474A3 (fr) 2002-02-14

Family

ID=19769237

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2000/000319 Ceased WO2000071474A2 (fr) 1999-05-21 2000-05-12 Procede de purification biologique d'eaux usees a faible teneur en matiere nutritive et appareil de mise en application de ce procede

Country Status (3)

Country Link
AU (1) AU4627900A (fr)
NL (1) NL1012130C2 (fr)
WO (1) WO2000071474A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105347606A (zh) * 2015-09-23 2016-02-24 郑州大学综合设计研究院有限公司 一种甲醇蛋白废水处理工艺

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943055A (en) * 1974-07-03 1976-03-09 Vladimir Nikolaevich Korenkov Process for purification of industrial waste waters from perchlorates and chlorates
DE3335984C1 (de) * 1983-10-04 1985-02-21 Imhausen-Chemie GmbH, 7630 Lahr Verfahren zur anaeroben Reinigung chemischer Industrieabwässer
US5510032A (en) * 1992-07-13 1996-04-23 Vail; William J. Process for treating aqueous solutions containing industrial wastes
DE19716939C2 (de) * 1997-04-23 2002-06-27 Bernd Diering Verfahren und Abwasserbehandlungsanlage zur biologischen Aufbereitung von farbstoffhaltigen Abwässern aus der Textil- und Lederindustrie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105347606A (zh) * 2015-09-23 2016-02-24 郑州大学综合设计研究院有限公司 一种甲醇蛋白废水处理工艺

Also Published As

Publication number Publication date
NL1012130C2 (nl) 2000-11-23
WO2000071474A3 (fr) 2002-02-14
AU4627900A (en) 2000-12-12

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