WO2010140968A1 - Utilisation d'une composition de conditionnement d'eaux usées, système, matériau et procédé de recyclage d'eaux usées - Google Patents

Utilisation d'une composition de conditionnement d'eaux usées, système, matériau et procédé de recyclage d'eaux usées Download PDF

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Publication number
WO2010140968A1
WO2010140968A1 PCT/SE2010/050612 SE2010050612W WO2010140968A1 WO 2010140968 A1 WO2010140968 A1 WO 2010140968A1 SE 2010050612 W SE2010050612 W SE 2010050612W WO 2010140968 A1 WO2010140968 A1 WO 2010140968A1
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WO
WIPO (PCT)
Prior art keywords
wastewater
container
inner space
oxides
inlet
Prior art date
Application number
PCT/SE2010/050612
Other languages
English (en)
Inventor
Daniel Andersson
Kenth Andersson
Original Assignee
Kenrex Envirotech
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 Kenrex Envirotech filed Critical Kenrex Envirotech
Publication of WO2010140968A1 publication Critical patent/WO2010140968A1/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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • 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 invention relates to the use of a composition for conditioning wastewater, a wastewater treatment system and also to a wastewater treatment system which allows recycling of waste components and a method thereof.
  • wastewater enters a vessel containing particulate matter.
  • the particulate matter may be active or inactive, and may comprise microorganisms. After passing through the particulate matter the filtered wastewater exits the vessel.
  • US 5,674,383 describes a water purification filter comprising a plurality of drainage tubes and a distribution means, the purpose of which is to maintain good distribution of water through the system irrespective of flow rates. This leads to improved purification performance. As noted in US 5,674,383 one could combine the water purification filter with other treatments, such as septic tank pre-treatment. Systems focused on purification and system performance often require removal and disposal of sludge or regeneration of filter materials.
  • Residue from the production of metal production such as metals referred to as transition metals in the periodic table and alloys thereof, and specifically residue from the production of iron and steel can be used as sewage plant filter media.
  • residue from metal production for treating wastewater such as filtering the wastewater through the residue
  • the pressure drop across the filter component is very often increased rapidly.
  • the filer element must be re-conditioned or renewed increasing complexity and cost.
  • one of the objectives with the present invention is to increase the life expectancy of the composition comprising residue from the production of metals for conditioning wastewater, i.e. material comprising rock crystal.
  • a further objective with the present invention is to improve the ability of the material comprising rock crystal (i.e. residue from the production of metal production) to reduce the phosphorous content of wastewater, specifically the longer term ability to reduce the phosphorous content.
  • the improved system can be used in place of, or in addition to, conventional systems such as septic tanks, and offers improved filtration of wastewater concurrently with recycling waste material.
  • a system which comprises a container having an inner space, an inlet in fluid communication with the inner space and an outlet in fluid communication with the inner space, material comprising rock crystal disposed in the inner space of the container, a diffusing means located between the material and the inlet, and a retaining means located between the material and the outlet, where the wastewater is subjected to a pretreatment step reducing the biochemical oxygen demand (BOD) of the waste water to less than 100 mg/l before the waste water is in contact with the material comprising rock crystal.
  • BOD biochemical oxygen demand
  • a further object of the invention is the use of a composition comprising residue from the production of metals for conditioning wastewater having a biochemical oxygen demand (BOD) of less than 100 mg/l.
  • BOD biochemical oxygen demand
  • composition comprising residue from the production of metals can successfully be used for conditioning wastewater having a biochemical oxygen demand of less than an about 100 mg/l.
  • the rock crystals also referred to composition comprising residue from the production of metal
  • the rock crystals can comprise by weight 0-5% Fe, 20-50% Ca, 0-5% S, 0-5% Mn, 10-30% Mg, 5-30% AI 2 O 3 , 0-10% TiO 2 , and 20-50% SiO 2 .
  • the rock crystals could have an average particle size of 0.1 -5 mm, more preferably 0.4 mm.
  • the above metals are usually present in oxidised form.
  • the residue may comprise silicate oxides, and oxides of metals from the group consisting of calcium, magnesium, aluminium.
  • the residue comprises silicate oxides and oxides of metals from the groups consisting of calcium, magnesium, aluminium, titanium. More specifically, the residue may comprise by weight 0-5% iron oxides, 20-50% calcium oxides, 0-5% sulphur, 0-5% manganese oxides, 10-30% magnesium oxides, 5-30% aluminium oxides, 0-10% titanium oxides, and 20-50% silicate oxides.
  • the composition may consist essentially of the residue. The wastewater is filtered through the composition comprising the residue and may be referred to as a filter composition.
  • the container could further comprise an access means and/or it could comprise separation means provided between the diffusing means and the retaining means.
  • the container could be generally cylindrical.
  • the system could be disposed, for example, substantially horizontally or substantially vertically.
  • the system could be substantially subterranean.
  • a method for recycling wastewater components comprising providing a container having an inner space, an inlet in fluid communication with the inner space, an outlet in fluid communication with the inner space, a diffusing means located between the material and the inlet, and a retaining means located between the material and the outlet, providing material comprising rock crystals in the inner space of the container, putting wastewater in the container via the inlet, allowing the wastewater to contact the material for a period of time, removing the wastewater from the outlet, removing the material from the container, and using the removed material as fertiliser or soil improver.
  • the removed material could comprise phosphorous.
  • the removed phosphorous could comprise at least 70%, preferably at least 80%, more preferably at least 90%, even more preferably at least 95% of the phosphorous in the wastewater.
  • the wastewater could be pretreated prior to the step of putting the wastewater in the container.
  • the wastewater is pretreated before reaching the material disposed in the inner space of the container.
  • the biochemical oxygen demand (BOD) of the wastewater is reduced to less than about 100 mg/l, typically less than about 80 mg/l, preferably less than about 70 mg/l, preferably less than about 65 mg/l, less than 60 mg/l.
  • Figure 1 is a schematic view of a longitudinal cross section through a system according to the invention
  • Figure 2 is a schematic perspective view of an embodiment of a system according to the invention
  • Figure 3 is a schematic view of a longitudinal cross section through a further embodiment of a system according to the invention
  • Figure 4 is a schematic view of a longitudinal cross section through a further embodiment of a system according to the invention
  • Figures 5A-C show embodiments of separation means which can be used in conjunction with the present invention.
  • Figure 6 is a graph visualising the phosphorous content of incoming wastewater (rhombic signs) and the phosphorous content of the outgoing (exiting) water (square signs)
  • Nitrogen is another component present in relatively high amounts in certain sources of wastewater. Elevated concentrations of nitrogenous species such as ammonium or nitrate cause eutrophication, which can initiate an undesired chain reaction of negative environmental consequences. Consequently, local authorities are increasingly limiting release of nitrogen into the natural water cycle as well. Depending on the sensitivity of the local environment, these limits can be very stringent.
  • a system of the present invention not only efficiently and effectively removes waste components to produce purified water; it also produces a particulate material which can be used as a source of the captured materials in commercial applications.
  • Figure 1 illustrates a general configuration of a wastewater treatment system 10, providing a container 11 having an inlet 12 and an outlet 13.
  • Material 14 is provided in container 11.
  • a diffusing means 15 is provided between inlet 12 and material 14, and serves to distribute incoming wastewater throughout the container.
  • a retaining means 16 is provided between outlet 13 and material 14, and primarily ensures that material 14 remains in container 11 and does not exit along with a wastewater stream.
  • a container access means 17 is shown for allowing access to the inside of container 11.
  • Container access means 17 can be one or more sealable, coverable, or otherwise generally closeable means of accessing container.
  • the primary purpose of container access means 17 is to deposit fresh and remove spent material 14.
  • An embodiment of a system 10 of the present invention is shown in Figure 2.
  • a container 11 is cylindrical and located in the horizontal direction.
  • a plurality of container access means 17 are provided in the form of ports.
  • An inlet 12 is shown as an opening in one of the ends of cylindrical container 11.
  • a source of wastewater for example, an outlet pipe from a home (not shown), could be coupled to inlet 12.
  • Figure 2 schematically represents a conventional cylinder which is readily available in a plurality of materials.
  • a plastic cylinder may be least reactive with the wastewater and the least expensive solution. It could be buried underground.
  • a diffusing means is provided to cause the wastewater to contact the material in a lateral fashion.
  • Vertical movement of waste water through the material ensures good contact and reduces or eliminates packing. This results in a more equal distribution of recovered wastewater components throughout the material over time, and also maintains a free-flowing system.
  • FIG. 3 shows a further embodiment of a system 10 according to the invention.
  • System 10 comprises a container 11 having not only diffusing means 15 and retaining means 16 but also a separation means 18 located therebetween, effectively dividing material 14 into separate groups. Only one separation means 18 is shown, however, a plurality could be provided.
  • a separation means is configured to permit wastewater to pass through but preferably does not allow material to pass through.
  • a separation means can help ensure the desired amount of movement of wastewater inside the container such that maximum contact is achieved between the wastewater and the particulate material inside the container. The use of a separation means may be advised when the container is a long cylinder, and additional separation means may be provided to longer containers.
  • Figure 4 illustrates an alternative embodiment of a system 10 according to the invention.
  • System 10 comprises a container 11 having material 14 for treating wastewater.
  • System 10 of Figure 4 is designed to be placed and operated in a generally vertical orientation as shown. Wastewater enters system 10 via inlet 12 and passes diffusing means 15 before contacting material 14. As sufficient wastewater is provided to inlet 12, the fluid level rises pushing wastewater through retaining means 16 and out of container 11 via outlet 13.
  • Container access means 17 in the form of a closeable opening is provided.
  • a pump could be provided in conjunction with the inlet, the outlet, inside the container, or any combination of these locations.
  • a pump could be provided in conjunction with the inlet, the outlet, inside the container, or any combination of these locations.
  • FIGS 5A, B, and C depict three examples of separation means 18 each having a plurality of openings 19 to allow passage of wastewater.
  • the depicted separation means 18 are generally round so that they correspond to the inside of a cylindrical container. Other shapes are of course possible.
  • the shape of the separation means need not necessarily conform to that of the inside of the container. However, the more closely the separation means fit the inner shape of the container, the more control the user has over the movement of material in the container.
  • the diffusing means, retaining means, and optional separation means may have the same or different configurations.
  • the diffusing means, retaining means, and optional separation means are sufficiently strong and rigid and serve their purpose without deformation.
  • the combination of diffusing and retaining means ensures the wastewater accesses the portion of the container holding the material from the side and bottom, flowing evenly through the material.
  • the pretreatment step reducing the biochemical oxygen demand (BOD) of the wastewater to less than about 100 mg/l may be positioned at any location upstream the material comprising rock crystals.
  • the pretreatment step may be an integral part of the container comprising the material comprising rock crystal disposed in the inner space of the container, a diffusing means located between the material and the inlet, and a retaining means located between the material and the outlet, alternatively, the pretreatment step could also be a separate entity not forming part of the container system.
  • the pretreatment step can also be integrated in the diffusion means.
  • the pretreatment step can be any means which is capable of reducing the biological oxygen demand (BOD).
  • the reduction of the BOD may be accomplished by providing biological active material, i.e. organic material capable of reducing BOD.
  • the biological active material embrace any type of living organisms ranging from microorganisms to highly complex living entities, e.g. various bacteria, plants and various forms of multicellular eukaryotic organisms typically having a marine habitat.
  • pretreatment steps include ponds, wastewater systems such as wastewater systems for treating blackwater from individual households not being connected to municipal wastewater systems such as various septic tanks.
  • the pretreatment step may also include any means which reduces the content of solid organic material such as various filters.
  • Wastewater as used in this application denotes water that has been affected by anthropogenic factors. Wastewater embraces e.g. wastewater discharged by domestic residences, commercial entities such as industry, and agriculture. If the wastewater comprises feces and/or urine, which commonly original from households (residential wastewater) and agriculture, the wastewater may be referred to as sewage. The wastewater may also be a mixture of different aqueous wastes from several sources. The BOD threshold is somewhat dependent on the flow rate of the waste water through the system.
  • the BOD of the wastewater contacting the rock crystal is preferably below 80 mg/l, below 60 mg/l, below 50 mg/l, and typically below 40 mg/l.
  • the BOD of the wastewater reaching the rock crystal is preferably below 20 mg/l.
  • the BOD of the wastewater contacting the rock crystal may be less than 100 mg/l or any of the ranges indicated on page 4.
  • BOD refers to a chemical procedure for determining the uptake rate of dissolved oxygen by the biological organisms in a body of water.
  • the BOD is measured using the BOD7 method according to standard SS-EN 1899-1.
  • the material provided in the container is itself a waste product: slag from steel production in the form of rock crystals. Once phosphorous and possibly nitrogen in the wastewater have bound to the material it can be removed from the container and used as a fertilizer and soil conditioner or soil improver. This further increases the advantages of the invention, not only by recycling components from wastewater but by utilising a by-product of the steel industry to achieve the goal.
  • the composition comprising residue from the production of metals is in this application also referred to as a material comprising rock crystals.
  • the residue may be a residue from the production of metals referred to as transition metals in the periodic table and alloys thereof, and specifically residue from the production of iron and steel.
  • the residue may also be referred to as slag such as blast furnace slag from metal production, and preferably from iron and steel production.
  • the material is available as air dried particles or in wet porous form.
  • wet porous form provides a surprisingly good effect beyond that obtained using air dried material. This may be due to the high surface density of wet porous forms.
  • a process according to the invention comprises the novel system and a supply of wastewater thereto.
  • the system 10, and more particularly the container 11 with material 14 can be used in connection with a variety of other wastewater treatment apparatuses or processes. Septic tanks or other pre-treatment systems are envisioned. It may be used in conjunction with sterilisation or decontamination processes. Alternatively or in addition, additional treatment phases may occur between the inlet and the diffusing means, and/or between the retaining means and the outlet.
  • one or more pre-treatment steps may be required to ensure optimum process efficiency.
  • the process can operate batch-wise, however, it may be most practical to run a continuous process.
  • the duration of time the wastewater is allowed to remain in contact with material i.e., the flow rate of the wastewater through the container, can be adjusted based on factors such as component content of the wastewater and the relative saturation of the material with the recycled component(s).
  • wastewater will remain in the system at least one day, preferably one to two days. Duration should preferably not exceed the time required for a biofilm to form inside the container.
  • a cylinder having a diameter of 0.8m and a length of 6m was placed in a horizontal orientation and provided with 18m 3 of particulate material.
  • the material was rock crystals with an average particle size of 0.4 mm. Any available crystals could be substituted, such as particles in the range of 0.1 -5 mm.
  • a diffusing means comprising a 0.8m diameter disk with a plurality of holes provided therein ensured a vertical flow of wastewater into the portion of the container comprising the material.
  • a system of the invention will be configured such that at least 70%, preferably at least 80%, more preferably at least 90%, even more preferably at least 95% of the phosphorous in the wastewater is removed.
  • the system was maintained at temperatures from approximately 5-25°C.
  • temperatures above the freezing point of the wastewater are required, however, the system is not particularly temperature-sensitive.
  • an advantage of the invention is the use of slag from steel production in the form of rock crystals as the material in the wastewater treatment system. This excess product is used to purify water and the resultant material with bound nutrients forms a fertiliser or soil conditioner. In specific applications it may be desired to enhance certain properties of the final material, alternatively different sources of rock crystals may offer different balances of base ingredients.
  • a material could be chosen which could prove to be particularly useful in applications where fertiliser is desired.
  • Ca and Si ⁇ 2 are available to form salts with components such as phosphorous and/or nitrogen in the wastewater. Complexed as salts these valuable nutrients would be more readily available to plants in the short- to mid-term when applied as fertiliser.
  • materials such as iron which might be expected to tightly complex nutrients into a less readily available form might be limited or excluded. See Table 3.
  • one could customise input material such that the output, after reaction with wastewater, would preferably offer soil improvement properties.
  • material whose component blend forms the desired degree of hardness/softness, acidity/alkalinity and such, based on the final application could be tailored. Again, see Table 3 for exemplary ranges which might be used to tailor a material blend.
  • Example 3 A wastewater treatment system was provided comprising a cylinder having a diameter of 0.8m and a length of 6m placed in a horizontal orientation and provided with 18m 3 of particulate material.
  • the material was rock crystals with an average particle size of 0.4 mm. Any available crystals could be substituted, such as particles in the range of 0.1 -5 mm. Further to the cylinder comprising rock crystal the wastewater was subjected to a pretreatment step before being feed to the cylinder.
  • a diffusing means comprising a 0.8m diameter disk with a plurality of holes provided therein ensured a vertical flow of wastewater into the portion of the container comprising the material.
  • the ability of reducing the BOD in the pretreatment step was varied.
  • the BOD7 level of the wastewater exiting the pretreatment step and entering the cylinder for the samples collected between June 28, 2008 and July 12, 2008 was significantly higher than 100 mg/l, ranging from 160 to 230 mg/l.
  • the graph clearly demonstrates that the ability for the rock crystal to reduce the total amount of phosphorus in the wastewater is highly dependent on the level of BOD of the wastewater entering the cylinder, i.e. contacting the rock crystal material.
  • the graph also supports that the ability of reducing phosphorous is maintained provided the BOD7 of the wasterwater entering the cylinder is less than 100 mg/l.
  • the BOD of the wastewater entering the cylinder collected after February 21 , 2009 was between 10 to 20 mg/l.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (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)
  • Removal Of Specific Substances (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

L'invention concerne un système pour recycler des composants d'eaux usées, comprenant une cuve présentant un espace interne, une entrée en communication fluidique avec l'espace interne et une sortie en communication fluidique avec l'espace interne, un matériau étant disposé dans l'espace interne de la cuve. Un matériau de diffusion est placé entre le matériau et l'entrée, et un moyen de retenue est placé entre le matériau et la sortie. Le matériau qui est une scorie, peut être recyclé en fertilisant ou agent d'amélioration du sol après contact avec les eaux usées.
PCT/SE2010/050612 2009-06-05 2010-06-03 Utilisation d'une composition de conditionnement d'eaux usées, système, matériau et procédé de recyclage d'eaux usées WO2010140968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0950413-5 2009-06-05
SE0950413 2009-06-05

Publications (1)

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WO2010140968A1 true WO2010140968A1 (fr) 2010-12-09

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017014687A1 (fr) * 2015-07-17 2017-01-26 Da Innovation Procédé et appareil pour le traitement de l'eau
WO2018132052A1 (fr) * 2017-01-12 2018-07-19 Werec Water Ecosystem Recovery Ab Système de traitement pour eaux pluviales
SE544179C2 (sv) * 2020-08-24 2022-02-22 Maxgrepp Handrims Ab Reningsanordning för trekammarbrunn
CN114364639A (zh) * 2019-06-20 2022-04-15 株式会社杉田制线 具有铁作为主组分的水净化材料及其制造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191229192A (en) * 1912-02-06 1913-07-24 Elie Jules Marcel Janvier Improvements in Apparatus for the Bacterial Treatment of Sewage and the like.
CA2305014A1 (fr) * 2000-04-10 2001-10-10 Cronitech Environnement Inc. Unite de traitement tertiaire avance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191229192A (en) * 1912-02-06 1913-07-24 Elie Jules Marcel Janvier Improvements in Apparatus for the Bacterial Treatment of Sewage and the like.
CA2305014A1 (fr) * 2000-04-10 2001-10-10 Cronitech Environnement Inc. Unite de traitement tertiaire avance

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
D.W. LEWIS: "Properties and uses of iron and steel slags", NATIONAL SLAG ASSOCIATION: MF 182-6, pages 1 - 11, XP003026957, Retrieved from the Internet <URL:http://www.nationalslag.org/archive/legacy/nsa_182-6_properties_and_uses_slag.pdf> *
HYLANDER L.D. ET AL: "Phosphorous retention in filter materials for wastewater treatment and its subsequent suitability for plant production", BIORESOURCE TECHNOLOGY, vol. 97, 2006, pages 914 - 921, XP025106038 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017014687A1 (fr) * 2015-07-17 2017-01-26 Da Innovation Procédé et appareil pour le traitement de l'eau
WO2018132052A1 (fr) * 2017-01-12 2018-07-19 Werec Water Ecosystem Recovery Ab Système de traitement pour eaux pluviales
CN114364639A (zh) * 2019-06-20 2022-04-15 株式会社杉田制线 具有铁作为主组分的水净化材料及其制造方法
EP3988202A4 (fr) * 2019-06-20 2023-05-03 Sugita Wire, Ltd. Matériau de purification d'eau contenant du fer en tant que composant principal, et son procédé de fabrication
SE544179C2 (sv) * 2020-08-24 2022-02-22 Maxgrepp Handrims Ab Reningsanordning för trekammarbrunn
SE2050976A1 (sv) * 2020-08-24 2022-02-22 Maxgrepp Handrims Ab Reningsanordning för trekammarbrunn

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