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WO2025024492A2 - Support mobile pour le traitement de l'eau - Google Patents

Support mobile pour le traitement de l'eau Download PDF

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Publication number
WO2025024492A2
WO2025024492A2 PCT/US2024/039243 US2024039243W WO2025024492A2 WO 2025024492 A2 WO2025024492 A2 WO 2025024492A2 US 2024039243 W US2024039243 W US 2024039243W WO 2025024492 A2 WO2025024492 A2 WO 2025024492A2
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
migrating
biofilm
wastewater
biofilm carrier
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.)
Pending
Application number
PCT/US2024/039243
Other languages
English (en)
Other versions
WO2025024492A3 (fr
Inventor
Jason Calhoun
Daniel DAIR
Pin-Hsuan Chang
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.)
Arxtera LLC
Original Assignee
Arxtera LLC
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 Arxtera LLC filed Critical Arxtera LLC
Publication of WO2025024492A2 publication Critical patent/WO2025024492A2/fr
Publication of WO2025024492A3 publication Critical patent/WO2025024492A3/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/105—Characterized by the chemical composition
    • C02F3/108—Immobilising gels, polymers or the like

Definitions

  • the present invention is directed to methods of wastewater treatment employing a migrating biofilm carrier, and more particularly to methods for the treatment of wastewater with an injection molded/extruded, acclimated, organic-filled biocomposite for use as a migrating carrier.
  • biological treatment of wastewater provides a complementary water treatment process.
  • wastewater is subjected to microorganisms.
  • the microorganisms can reduce different types of pollutants present in the wastewater and reduce the biochemical oxygen demand of the water.
  • activated sludge processes use aeration and microorganisms to biologically oxidize contaminants.
  • a migrating biofilm carrier for intensifying the treatment of wastewater including a biopolymer including an organic polymer, a fill material, and a densifying material.
  • a method of acclimating a carrier for treatment of wastewater including charging the carrier into an acclimation tank where the carrier includes a biopolymer, a fill material, and a densifying agent. Charging a conditioning agent into the acclimation tank and subjecting the carrier and the conditioning agent to aerobic, anaerobic, and/or anoxic conditions to provide an acclimated carrier wherein the acclimated carrier has a biofilm disposed on the carrier.
  • FIG. 1 is a schematic cross-sectional view of an embodiment of a migrating biofilm carrier
  • FIG. 2 is a schematic cross-sectional view of an embodiment of a migrating biofilm carrier
  • FIG. 3 is a graph illustrating biochemical oxygen demand (milligrams per milliliter, mg/mL) versus days for Example 1 ;
  • FIG. 4 is a graph illustrating ammonia concentration (mg/mL) versus days for Example 1 ;
  • FIG. 5 is a graph illustrating Total Kjeldahl Nitrogen (TKN) concentration (mg/mL) versus days for Example 1 ;
  • FIG. 6 is a graph illustrating total nitrogen concentration (mg/mL) versus days for Example 1.
  • a migrating biofilm carrier for intensifying the treatment of wastewater.
  • the carrier serves as a scaffolding for biofilm attachment, biofilm growth, and biofilm transport during wastewater treatment.
  • the carrier facilitates the transport of biofilm within a zone (e.g., an acclimation tank or a bioreactor) of a wastewater treatment system and throughout a wastewater treatment system.
  • the carrier includes a biopolymer, a fill material, and a densifying agent.
  • the densifying agent can modulate the specific gravity of the carrier.
  • the combination of the biopolymer, the fill material, and the densifying agent can be extruded together to provide a selected surface area, density and/or porosity.
  • the carriers can be acclimated for microbial attachment via exposure to influent contaminants, return activated sludge, waste activated sludge, bioaugmentation, and/or biostimulation.
  • biofilm growth can be optimized to provide a concentration suitable for carbon nutrients and nitrogen and phosphorus constituents removal.
  • the biofilm can be contacted with wastewater to reduce different types of pollutants present in the wastewater. In this manner, biofilm disposed on a carrier can be used to intensify a wastewater treatment process for predictability, consistency, and throughput.
  • Activated sludge is defined as an aerated sludge that contains flocculent culture of microorganisms developed under aeration conditions.
  • Bioaugmentation is defined as the addition of microbial strains and/or carbon nutrients to wastewater.
  • Biofilm is defined as at least two microorganisms that are disposed on a surface.
  • Biostimulation is defined as the addition of nitrogen and phosphorus constituents to wastewater.
  • Contaminated water is defined as water with at least one contaminant. Untreated wastewater and contaminated water are used interchangeably herein.
  • Effective surface area is defined as the surface area useable for biofilm attachment.
  • Return activated sludge is defined as settled activated sludge that is collected in a selector and returned to the bioreactor to mix with incoming untreated wastewater.
  • Solids retention time is defined as the time the solid fraction of the wastewater spends in the wastewater treatment system.
  • Waste activated sludge is defined as sludge removed from the wastewater treatment process.
  • the waste activated sludge contains excess biomass or cell mass and is removed to maintain the biological balance of the wastewater treatment system and/or achieve a specific solids retention time.
  • the migrating biofilm carrier serves as a scaffolding surface for microorganisms.
  • the carrier can transport the biofilm through a wastewater treatment system.
  • the movement of the carrier through a wastewater treatment system is based on the density and settling properties of the carrier.
  • Biofilm disposed on the carrier serves to intensify the biological wastewater treatment process by improving settleability, carbon nutrient and phosphorus and nitrogen constituent removal.
  • the carrier 100 can include a biopolymer 101 , a fill material 103, and a densifying agent 102.
  • the carrier can be compostable and/or biodegradable.
  • the carrier can be injection molded or extruded.
  • the carrier 100 can bein a core-shell format, where the biopolymer 101 partially or fully encapsulates a core of a fill material 103 and a densifying agent 102.
  • the biopolymer 101, the fill material 103, and the densifying agent 102 can be in a mixed format as shown in FIG. 2, such as uniformly distributed throughout the carrier.
  • the biopolymer 101, the fill material 103, and the densifying agent 102 may be distributed throughout the carrier in a homogenous or heterogenous manner. When the materials are distributed in a heterogenous matter, the biopolymer 101, the fill material 103, and the densifying agent 102 may be distributed in layers or in concentration gradients in the carrier 100.
  • the distributed mixed format of the biopolymer 101, the fill material 103, and the densifying agent 102 throughout the carrier 100 may be formed by co-extrusion of a mixture of the biopolymer 101, the fill material 103, and the densifying agent 102.
  • the carrier 100 can be nonabsorbent, neutrally charged, and/or inert.
  • the molding and/or extrusion of the mobile carrier 100 can provide an irregular surface with dimpling, porosity, and the like.
  • the irregular surface can facilitate the attachment of biofilm to the carrier, protect biofilm growth, increase the total and effective surface area, and provide differentiating redox zones on the carrier.
  • the outermost surface of the carrier may be exposed to different redox conditions than an interior covered surface area of the carrier 100.
  • the carrier 100 can be fully manufactured to a predetermined size, density, and/or surface area. The controlled physical and chemical characteristics of the carrier 100 can improve the consistency and predictability wastewater treatment process.
  • the carrier 100 can be a three-dimensional shape with a length, a width, and a height of about 500 micrometers to about 3 millimeters. In some embodiments, the carrier 100 is roughly spherical with a diameter of about 500 micrometers to about 3 millimeters.
  • the overall surface area of the carrier 100 can be about 0.02 square meters per gram (m 2 /g) to about 5 m 2 /g.
  • the specific gravity of the carrier 100 can be about 1 to about 5.
  • the core of the carrier 100 may contain the fill material 103.
  • the fill material 103 can be an organic material and/or a recycled material. Suitable fill materials include cellulose, lignocellulose, moss, algae, mollusk shells.
  • the fill material 103 can be about 5 weight percent (wt %) to about 95 wt %, about 10 wt % to about 75 wt%, or about 25 wt % to about 50 wt % of the total weight the carrier 100.
  • the biopolymer 101 of the carrier 100 may be an organic polymer, disposed primarily on the exterior of the fill material 103 and the densifying agent 102 or the biopolymer 101 may be homogeneously or heterogeneously mixed with fill material 103 and densifying agent 102.
  • the biopolymer 101 can be molded or extruded with the fill material 103 and the densifying agent 102.
  • the biopolymerlOl can be structured to provide a porous surface of the carrier 100.
  • Suitable biopolymers include polylactic acid (PL A), polypropylene (PP), high density polyethylene (HDPE), acrylonitrile butadiene styrene (ABS), low density polyethylene (LLDPE), high impact polystyrene (HIPS), or combinations thereof.
  • the biopolymers can be biodegradable.
  • suitable biodegradable polymers are polylactic-glycolic acid (PLGA), poly-caprolactone (PCL), copolymers of polylactic-glycolic acid and poly-caprolactone (PCL-PLGA copolymer), polyhydroxy- butyrate-valerate (PHBV), polyorthoester (POE), polyethylene oxide-butylene terephthalate (PEO-PBTP), poly-D,L-lactic acid-p-dioxanone-polyelhylene glycol block copolymer (PLA- DX-PEG), or the like, or combinations comprising at least one of the foregoing biodegradable polymers.
  • PLGA polylactic-glycolic acid
  • PCL poly-caprolactone
  • PCL-PLGA copolymer polyhydroxy- butyrate-valerate
  • POE polyorthoester
  • PEO-PBTP polyethylene oxide-butylene terephthalate
  • PLA- DX-PEG poly-D
  • the biopolymer 101 can include a mixture of biopolymers of about 5 wt % to about 30 wt % of the total weight of the biopolymer 101.
  • the biopolymer 101 can be about 1 wt % to about 99 wt %, 2 wt % to 75 wt %, 5 wt % to about 30 wt %, or about 2 wt % to about 15 wt % of the total weight the carrier 100.
  • the densifying agent 102 can be organic or inorganic compounds.
  • the densifying agent 102 can include organic compounds with a hydroxyl functionality to increase hydrogen bonding in the filler core of the carrier.
  • Suitable densifying agents include calcium salts, iron salts, granular activated carbon, and the like, and combinations thereof.
  • the densifying agent 102 may include metals (e.g., iron) or Group II salts, such as a calcium salt, a strontium salt, a barium salt, or a combination thereof.
  • the densifying agent 102 may be calcium carbonate, ferric chloride, barium chloride, iron, or the like.
  • the densifying agent 102 may be comprise 2, 3, or 4 organic or inorganic compounds.
  • the densifying agent 102 comprises two organic or inorganic compounds
  • the two organic or inorganic compounds may be present in a 1: 1 ratio, a 1 :2 ratio, a 1 :3 ratio, a 1 :4 ratio, or the like.
  • the densifying agent 102 can be about 0.2 wt % to about 75 wt %, 2 wt % to about 60 wt %, about 5 wt % to about 50 wt %, or about 10 wt % to about 25 wt % of the total weight the carrier 100.
  • a biofilm biomass is disposed on the migrating biofilm carrier 100 during and/or prior to wastewater treatment.
  • the biofilm biomass includes microorganisms such as bacteria and protozoa.
  • the biofilm biomass can be a single or heterogeneous species.
  • the species of microorganism for the biofilm biomass are selected based on the composition of the incoming contaminated water, the redox conditions of the bioreactor, and the solids retention time (SRT).
  • the biofilm biomass serves to biodegrade the constituents, such as phosphorus and nitrogen containing chemicals and nutrients, such as carbonaceous materials, contained in the contaminated water. Proper species selection and concentration of the biofilm biomass improves nutrient carbon removal, reduces suspended fine solids, and reduces total suspended solids.
  • the application of the biofilm disposed on the carrier to contaminated water increases the efficiency and throughput of the wastewater treatment.
  • Use of the composition saves time, decreases treatment costs, and increases the treatment capacity of the system.
  • a method of acclimating the carrier for treatment of wastewater can include acclimating the carrier 100 in an acclimation tank.
  • the carrier 100 can be charged into an acclimation tank and treated to one or more of a combination of redox conditions, such as aerobic, anaerobic, and/or anoxic.
  • the carrier 100 may be treated to one or more of a combination of redox conditions for 1 hour, 12 hours, 1 day, or 7 days to provide an acclimated carrier.
  • the carrier 100 can be treated with untreated wastewater influent, return activated sludge, waste activated sludge, bioaugmentation, and/or biostimulation.
  • Conditioning agents can be charged into the acclimation tank in combination with the carrier.
  • Conditioning agents can include seed microorganisms.
  • the seed microorganisms can be contained in the untreated wastewater influent, return activated sludge, waste activated sludge, bioaugmentation, and/or biostimulation.
  • the seed microorganisms can include a nitrifier, a denitrifier, methanogens, gram-negative bacteria, heterotrophic bacteria, or combinations thereof.
  • a method of wastewater treatment can include charging a carrier 100 into a wastewater treatment system.
  • the carrier 100 is acclimated prior to charging of the carrier into the wastewater treatment system.
  • biofilm is disposed on the carrier.
  • the carrier with biofilm disposed thereon can be transported throughout the wastewater treatment system.
  • the biofilm disposed on the carrier reduces carbon nutrients and nitrogen and phosphorus constituents contained in the wastewater to provide treated wastewater.
  • the biofilm disposed on the carrier serves to intensify the wastewater treatment process by increasing predictability, consistency, and throughput.
  • a Biofilm Carrier System comprising the disclosed carrier 100 was installed in the Wastewater Treatment System.
  • the average values of the ammonia, TKN, and TN of the effluent decreased after installation of the Biofilm Carrier System and the variation in the data also decreased (i.e., decreased standard deviation), see Table 2. Accordingly, application of the disclosed carrier 100 to a wastewater treatment system can provide improved process consistency and efficiency.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

L'invention concerne un support de biofilm à migration pour intensifier le traitement d'eaux usées comprenant un biopolymère comprenant un polymère organique, un matériau de remplissage et un matériau de densification. L'invention concerne également un procédé d'acclimatation d'un support de biofilm à migration pour le traitement d'eaux usées consistant à charger le support dans un réservoir d'acclimatation, charger un agent de conditionnement dans le réservoir d'acclimatation, et soumettre le support et l'agent de conditionnement à des conditions aérobies, anaérobies et/ou anoxiques pour produire un support acclimaté, le support acclimaté ayant un biofilm disposé sur le support.
PCT/US2024/039243 2023-07-26 2024-07-24 Support mobile pour le traitement de l'eau Pending WO2025024492A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202363515698P 2023-07-26 2023-07-26
US63/515,698 2023-07-26

Publications (2)

Publication Number Publication Date
WO2025024492A2 true WO2025024492A2 (fr) 2025-01-30
WO2025024492A3 WO2025024492A3 (fr) 2025-06-12

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Application Number Title Priority Date Filing Date
PCT/US2024/039243 Pending WO2025024492A2 (fr) 2023-07-26 2024-07-24 Support mobile pour le traitement de l'eau

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3146035B1 (fr) * 2014-05-21 2021-05-19 Nuvoda LLC Supports de biofilm, système et procédé de traitement
CN105621595A (zh) * 2016-01-27 2016-06-01 苏州科环环保科技有限公司 微生物挂膜用亲水载体
US12221369B2 (en) * 2021-03-12 2025-02-11 Hampton Roads Sanitation District Method and apparatus for nutrient removal using anoxic biofilms

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WO2025024492A3 (fr) 2025-06-12

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