US20130091912A1 - Treatment of organic waste - Google Patents

Treatment of organic waste Download PDF

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Publication number
US20130091912A1
US20130091912A1 US13/636,320 US201113636320A US2013091912A1 US 20130091912 A1 US20130091912 A1 US 20130091912A1 US 201113636320 A US201113636320 A US 201113636320A US 2013091912 A1 US2013091912 A1 US 2013091912A1
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microorganisms
organic waste
canceled
bacillus
organic
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Chum Mok Puah
Eng Tong Sim
Siok Lui Chua
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Biomax Holdings Pte Ltd
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Biomax Holdings Pte Ltd
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Assigned to BIOMAX HOLDINGS PTE LTD reassignment BIOMAX HOLDINGS PTE LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BIOMAX TECHNOLOGIES PTE LTD, LUI, CHUA SIOK, MOK, PUAH CHUM, TONG, SIM ENG
Publication of US20130091912A1 publication Critical patent/US20130091912A1/en
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    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C02F3/341—Consortia of bacteria
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B15/00—Organic phosphatic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F1/00—Fertilisers made from animal corpses, or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F11/00—Other organic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/20—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation using specific microorganisms or substances, e.g. enzymes, for activating or stimulating the treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F3/00—Fertilisers from human or animal excrements, e.g. manure
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F5/00—Fertilisers from distillery wastes, molasses, vinasses, sugar plant or similar wastes or residues, e.g. from waste originating from industrial processing of raw material of agricultural origin or derived products thereof
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20—Bacteria; Culture media therefor
    • C12N1/205—Bacterial isolates
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
    • C12R2001/00—Microorganisms ; Processes using microorganisms
    • C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
    • C12R2001/07—Bacillus
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
    • C12R2001/00—Microorganisms ; Processes using microorganisms
    • C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
    • C12R2001/225—Lactobacillus
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
    • C12R2001/00—Microorganisms ; Processes using microorganisms
    • C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
    • C12R2001/38—Pseudomonas
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock
    • Y02P20/145—Feedstock the feedstock being materials of biological origin
    • 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
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

Definitions

  • the present invention generally relates to a process for treating organic waste.
  • the present invention also relates to a composition, a system and a kit for treating organic waste.
  • landfills require extensive areas and are both unsanitary and unsightly. Furthermore, landfills create problems such as the leaching of harmful chemicals into the soil, contaminating ground water, and causing loss of essential nutrients into the soil. Incineration is expensive, energy-intensive and creates environmental problems. For example, Malaysia, which has over 2.65 million hectares of oil palm plantations and, can generate 90% total biomass of waste annually of all harvested materials, has prohibited open burning of organic waste to prevent air pollution. The European Union has also mandated a general ban on landfilling of organic waste in 2005.
  • Biological treatment of organic waste has been applied in an attempt to address the problem of organic waste disposal.
  • Biological treatment of organic waste can convert organic waste into harmless and value-added products.
  • Biological treatment methods use naturally-occurring microorganisms to degrade complex hydrocarbon-contaminated waste into simpler low-carbon, non-toxic residues via fermentation.
  • the product residues of biological treatment methods are typically harmless and therefore there is typically no requirement for any post-process treatment, storage or discharge.
  • C:N ratio carbon to nitrogen ratio
  • a process for treating organic waste comprising the step of contacting an organic waste with at least one of the following microorganisms: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms, the contacting being undertaken under conditions to at least partly convert the organic waste to organic fertilizer.
  • a process for treating organic waste comprising the step of contacting an organic waste with one or more microorganisms from at least three of the following microorganism species: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms, the contacting being undertaken under conditions to at least partly convert the organic waste to organic fertilizer.
  • the disclosed process comprises the step of contacting an organic waste with at least two, at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, or more of the following microorganisms: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms.
  • the disclosed process further comprises the step of contacting the organic waste with one or more microorganisms selected from the group consisting of Streptomyces sp. microorganisms, and Corynebacterium sp. microorganisms.
  • the disclosed process further comprises the step of contacting the organic waste with one, two, three, four, five, six, seven, eight, nine, or more microorganisms selected from the group consisting of Streptomyces sp. microorganisms, and Corynebacterium sp. microorganisms.
  • a specialty blend of the microorganism species may be used to promote conversion of the organic waste to organic fertilizer. Additionally, the organic waste may be supplemented with additives and nutrients to further promote the conversion.
  • the process parameters and the consortium of microorganism species may be tailored for treatment of different compositions of waste. More advantageously, the tailored selection of process parameters and consortium of microorganism species accelerates the treatment process to reduce the treatment time from several months to one to several days.
  • the tailored selection of process parameters and consortium of microorganism species accelerates the treatment process such that the initial C:N ratio of the organic waste may be substantially reduced to a range suitable for use as organic fertilizer within one to several days.
  • Bacillus sp. microorganisms Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms, for treating an organic waste to produce organic fertilizer, increase the NPK value of an organic fertilizer, increase the potassium value of an organic fertilizer, reduce odour of an organic waste, prevent leaching of nutrients from organic waste, or reduce waste accumulation.
  • microorganisms from at least three of the following microorganism species: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms, for treating an organic waste to produce organic fertilizer, increase the NPK value of an organic fertilizer, increase the potassium value of an organic fertilizer, reduce odour of an organic waste, prevent leaching of nutrients from organic waste, or reduce waste accumulation.
  • compositions for treating an organic waste comprising at least one of the following microorganisms: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms.
  • compositions for treating an organic waste comprising one or more microorganisms from at least three of the following microorganism species: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms.
  • the composition is a solution.
  • the composition is a powder.
  • an organic fertilizer comprising an organic waste and a composition as defined above.
  • kits for use in treating an organic waste comprising:
  • kits for use in treating an organic waste comprising:
  • a system for treating an organic waste comprising:
  • the at least two arms of the stirring means extend radially from the center of the treatment zone.
  • the location of the at least two arms of the stirring means at different heights along the longitudinal axis of, and extending radially from the center of the treatment zone promotes mixing of the organic waste and the composition to enhance treatment of the organic waste.
  • the location of the at least two arms of the stirring means at different heights along the longitudinal axis of the treatment zone ensures that the organic waste and composition as defined above disposed at the bottom of the treatment zone are rapidly and well mixed with the organic waste and composition as defined above disposed at the top of the treatment zone, and that the mixture can achieve the desired temperature, moisture content and aeration level.
  • organic waste refers to carbon-containing substances that are of biological origin, and may be derived from living or formerly living organisms.
  • treat when used herein with reference to an organic waste refers to contact of the organic waste with a disclosed composition which results in degradation or conversion of the chemical compounds contained within the organic waste.
  • the treatment may involve degradation of the chemical compounds so as to neutralize odorous compounds contained therein and render the organic waste odorless, or conversion of the carbon-compounds or nitrogen fixation so as to increase the nutrient level of the organic waste.
  • the degradation or conversion may be, for example, effected by the enzymes that are secreted by the one or more microorganisms in the disclosed composition.
  • Exemplary enzymes include, but are not limited to, cellulases, amylases, xylanases, galactanases, mannanases, arabanases, ⁇ -1,3-1,4-glucanases, glucosidases, xylosidases, lipases, hemicellulases, pectinases, proteases, pectin esterases, and the like.
  • the term “about”, in the context of concentrations of components of the formulations, typically means +/ ⁇ 5% of the stated value, more typically +/ ⁇ 4% of the stated value, more typically +/ ⁇ 3% of the stated value, more typically, +/ ⁇ 2% of the stated value, even more typically +/ ⁇ 1% of the stated value, and even more typically +/ ⁇ 0.5% of the stated value.
  • range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the disclosed ranges. Accordingly, the description of a range should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range.
  • a process for treating organic waste comprising the step of contacting an organic waste with one or more microorganisms from at least three of the following microorganism species: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms and Lactobacillus sp. microorganisms, the contacting being undertaken under conditions to at least partly convert the organic waste to organic fertilizer.
  • Organic waste that may be treated using the disclosed process, composition, kit and system include, but are not limited to agricultural waste, food waste, organic refuse, mill effluent, municipal waste, sewage, sludge, animal waste, and industrial waste.
  • Exemplary agricultural wastes include, but are not limited to, oil palm empty fruit bunch (EFB), palm decanter cake slurry, olive husk, corn cob, coffee bean husk, rice husk, rice straw, spent mushroom compost, palm foliage, palm trunk, palm kernel shells, palm fiber, farm effluent, slaughterhouse waste, flower cuttings, spent flower compost, wheat straw, fruit waste, vegetable waste, and the like.
  • EFB oil palm empty fruit bunch
  • palm decanter cake slurry include, but are not limited to, olive husk, corn cob, coffee bean husk, rice husk, rice straw, spent mushroom compost, palm foliage, palm trunk, palm kernel shells, palm fiber, farm effluent, slaughterhouse waste, flower cuttings, spent flower compost, wheat straw, fruit waste, vegetable
  • Exemplary animal wastes include, but are not limited to, dead animals, animal feather, animal parts (such as animal intestines), and animal manure such as poultry manure, cow manure, goat manure, horse manure, sheep manure, and swine manure.
  • Mill effluent may be, for example, palm oil mill effluent (POME) and POME sludge.
  • the organic waste to be treated in the disclosed process may be selected based on criteria such as availability due to for example geographical or seasonal variability, cost, suitability, desired product and product properties, and the like. For example, in palm oil producing regions, about 8 million tons of empty fruit bunch (EFB) are generated annually, and hence provides an abundant source of organic waste that can be treated using the disclosed process to at least partly convert the EFB into useful organic fertilizer. Similarly, a typical food processing plant can generate between about 1.5 to about 2 tons of sludge per day while a poultry slaughterhouse can generate about 300 m cu/day of wastewater, which result in abundant sources of organic waste for use in the disclosed process.
  • EFB empty fruit bunch
  • a single type of organic waste may be used in the disclosed process, or any combination of more than one type of organic waste may be used.
  • EFB may be used together with chicken manure
  • food waste may be used together with POME sludge.
  • Other exemplary combinations of organic wastes include, but are not limited to, a combination of chicken manure with dead chickens, a combination of chicken manure with chicken feathers, a combination of EFB with chicken manure, a combination of EFB with chicken manure and POME, and a combination of EFB and POME sludge.
  • Organic waste may be pre-processed prior to being used in the disclosed process.
  • a solid organic waste is typically pre-processed to obtain the desired particle size.
  • Particle size is an important parameter in determining the efficacy of the treatment process.
  • Particle size of organic waste for use in the disclosed process is preferably about 1 mm to about 20 mm, from about 2 mm to about 20 mm, from about 3 mm to about 20 mm, from about 4 mm to about 20 mm, from about 5 mm to about 20 mm, from about 6 mm to about 20 mm, from about 7 mm to about 20 mm, from about 8 mm to about 20 mm, from about 9 mm to about 20 mm, from about 10 mm to about 20 mm, from about 11 mm to about 20 mm, from about 12 mm to about 20 mm, from about 13 mm to about 20 mm, from about 14 mm to about 20 mm, from about 15 mm to about 20 mm, from about 16 mm to about 20 mm, from about
  • a liquid organic waste such as waste from food processing plants or slaughter houses may be pre-processed prior to being used in the disclosed process.
  • the fatty and proteinaceous solid matters in such wastes are separated by a Dissolved Air Flotation (DAF) tank, after which the food particles are creamed off into a slurry tank leaving the DAF-treated liquid to be pumped into an aerator tank for further processing. Sludge from the DAF tank as well as the solid matters may be collected for use in the disclosed process.
  • DAF Dissolved Air Flotation
  • Another typical pre-process step is to adjust the moisture content of the organic waste. This is because, the moisture content of organic waste varies widely depending on the source, and determines the availability of waste material that can be potentially converted to organic fertilizer. Preferably, the initial moisture of the organic waste is about 25% (wt) to about 70% (wt).
  • the initial moisture of the organic waste may be about 25% (wt) to about 70% (wt), about 25% (wt) to about 60% (wt), about 25% (wt) to about 50% (wt), about 25% (wt) to about 40% (wt), about 25% (wt) to about 35% (wt), about 25% (wt) to about 30% (wt), about 30% (wt) to about 70% (wt), about 40% (wt) to about 70% (wt), about 50% (wt) to about 70% (wt), about 60% (wt) to about 70% (wt), about 65% (wt) to about 70% (wt), about 30% (wt) to about 65% (wt), about 35% (wt) to about 60% (wt), about 40% (wt) to about 55% (wt), or about 45% (wt) to about 50% (wt).
  • the moisture content of the organic waste is about 30% (wt) to about 65% (wt). In another embodiment, the moisture content of the organic waste is about 35% (wt) to about 60% (wt). In yet another embodiment, the moisture content of the organic waste is about 50% (wt) to about 60% (wt).
  • the moisture content of organic waste may be adjusted so that it falls within the preferred ranges by means that are well known to those skilled in the art. For example, where the moisture content falls below the preferred ranges, the organic waste may be sprayed with water so that the moisture content is increased to a preferred level. Conversely, where the moisture content is above the preferred ranges, pre-drying may be applied to the organic waste to reduce the moisture content to the preferred level. Alternatively, the moisture content may be reduced by blending the organic waste with other organic wastes that are dry or that have lower moisture contents such as rice husk, rice straw, saw dust, and the like, to achieve the desired moisture content level.
  • the initial moisture content is maintained for at least about 4 h to about 10 h, at least about 5 h to about 10 h, at least about 6 h to about 10 h, at least about 7 h to about 10 h, at least about 8 h to about 10 h, at least about 9 h to about 10 h, at least about 4 h to about 9 h, at least about 4 h to about 8 h, at least about 4 h to about 7 h, at least about 4 h to about 6 h, or at least about 4 h to about 5 h from the start of the process.
  • the moisture content is preferably reduced to about 10% (wt) to about 22% (wt), more preferably to about 13% (wt) to about 21% (wt), and most preferably to about 15% (wt) to about 20% (wt).
  • the moisture content may be reduced to about 10% (wt) to about 21% (wt), about 10% (wt) to about 20% (wt), about 10% (wt) to about 19% (wt), about 10% (wt) to about 18% (wt), about 10% (wt) to about 17% (wt), about 10% (wt) to about 16% (wt), about 10% (wt) to about 15% (wt), about 10% (wt) to about 14% (wt), about 10% (wt) to about 13% (wt), about 10% (wt) to about 12% (wt), about 10% (wt) to about 11% (wt), about 11% (wt) to about 22% (wt), about 12% (wt) to about 22% (wt), about 12% (
  • the organic waste is also heated to about 80° C. to about 175° C., about 90° C. to about 175° C., about 100° C. to about 175° C., about 110° C. to about 175° C., about 120° C. to about 175° C., about 130° C. to about 175° C., about 140° C. to about 175° C., about 150° C. to about 175° C., about 160° C. to about 175° C., about 170° C. to about 175° C., about 80° C. to about 170° C., about 80° C. to about 160° C., about 80° C. to about 150° C., about 80° C.
  • the organic waste or combination of more than one type of organic waste may optionally be combined with other additives or nutrients to enhance conversion of the organic waste by the microorganisms or to increase the nutrient level of the organic fertilizer produced by the disclosed process.
  • additives may be, for example, carbon sources such as ash, saw dust, dried leaves, wood shavings, and the like.
  • the organic waste, or mixture of organic wastes is typically cooled to about 35° C. to about 75° C., about 40° C. to about 75° C., about 45° C. to about 75° C., about 50° C. to about 75° C., about 55° C. to about 75° C., about 60° C. to about 75° C., about 65° C. to about 75° C., about 70° C. to about 75° C., about 35° C. to about 70° C., about 35° C. to about 65° C., about 35° C. to about 60° C., about 35° C. to about 55° C., about 35° C. to about 50° C., about 35° C. to about 45° C., or about 35° C.
  • the organic waste, or mixture of organic wastes is cooled to about 50° C. to about 65° C., about 51° C. to about 65° C., about 52° C. to about 65° C., about 53° C. to about 65° C., about 54° C. to about 65° C., about 55° C. to about 65° C., about 56° C. to about 65° C., about 57° C. to about 65° C., about 58° C. to about 65° C., about 59° C. to about 65° C., about 60° C. to about 65° C., about 61° C. to about 65° C., about 62° C.
  • the conditions within the treatment zone may be controlled and monitored so that the conditions may be maintained at an optimum required for enhancing conversion of the organic waste to organic fertilizer.
  • the conditions to be monitored may include moisture, temperature, aeration, nutrient supply, and pH. The optimal values for such conditions typically depend on the selection of microorganisms in the microorganism composition.
  • no pH control is applied and the process is allowed to proceed at the pH value of the organic waste(s) used.
  • the pH of the organic waste is about 3 to about 10, about 4 to about 10, about 5 to about 10, about 6 to about 10, about 7 to about 10, about 8 to about 10, about 9 to about 10, about 3 to about 9, about 3 to about 8, about 3 to about 7, about 3 to about 6, about 3 to about 5, or about 3 to about 4.
  • the pH of EFB is about 6
  • the pH of citrus peels is about 4
  • the pH of chicken manure is about 9.
  • the pH is controlled at values of about 3 to about 10, about 4 to about 10, about 5 to about 10, about 6 to about 10, about 7 to about 10, about 8 to about 10, about 9 to about 10, about 3 to about 9, about 3 to about 8, about 3 to about 7, about 3 to about 6, about 3 to about 5, or about 3 to about 4.
  • Control of pH may be applied, for example, by adding an appropriate pH buffer such as a phosphate buffer, an acetate buffer, a Tris buffer, and the like.
  • microorganisms useful in the disclosed process are those that are capable of degrading carbon compounds or fixing nitrogen compounds.
  • mixed cultures of the microorganisms are used in order to obtain a broad spectrum of degradation or fixation.
  • composition comprising at least one of Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, and Lactobacillus sp. microorganisms.
  • composition comprising one or more microorganisms from at least three of the following microorganism species: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, and Lactobacillus sp. microorganisms.
  • composition comprising one or more microorganisms from each of the following microorganism species: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, and Lactobacillus sp. microorganisms.
  • the Bacillus sp. microorganisms are preferably selected from the group consisting of Bacillus pumilus, Bacillus stearothermophilus, Bacillus brevis, Bacillus cereus, Bacillus subtilis, Bacillus sphearieus, and Bacillus licheniformis.
  • the Pseudomonas sp. microorganisms are preferably selected from the group consisting of Pseudomonas alcaligenes and Pseudomonas marinoglutinosa, the Bifidobacterium sp. is preferably Bifidobacterium thermophilus, and the Lactobacillus sp. microorganisms are preferably selected from the group consisting of Lactobacillus casei, Lactobacillus planatarum, and Lactobacillus fermentus.
  • the composition may further comprise one or more microorganisms selected from the group consisting of Streptomyces sp. microorganisms and Corynebacterium sp. microorganisms.
  • a preferred Streptomyces sp. microorganism is Streptomyces pactum, while a preferred Corynebacterium sp. microorganism is Corynebacterium striatum.
  • the composition may comprise a single species of microorganisms, for example one of Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, or Lactobacillus sp. microorganisms, with one or both of Streptomyces sp. microorganisms or Corynebacterium sp. microorganisms.
  • the composition may comprise more than one species of microorganisms selected from Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, and Lactobacillus s p. microorganisms, with one or both of Streptomyces sp. microorganisms or Corynebacterium sp. microorganisms.
  • the composition comprises at least two of Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, and Lactobacillus sp. microorganisms.
  • the composition comprises at least three of Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, and Lactobacillus sp. microorganisms.
  • the composition comprises all four species of microorganisms: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp. microorganisms, and Lactobacillus sp. microorganisms, with one of Streptomyces sp. microorganisms or Corynebacterium sp. microorganisms.
  • the composition comprises all four species of microorganisms: Bacillus sp. microorganisms, Pseudomonas sp. microorganisms, Bifidobacterium sp.
  • the composition comprises Streptomyces pactum, Corynebacterium striatum, Bacillus pumilus, Bacillus stearothermophilus, Bacillus brevis, Bacillus cereus, Bacillus subtilis, Bacillus sphearieus, Bacillus licheniformis, Pseudomonas alcaligenes, Pseudomonas marinoglutinosa, Bifidobacterium thermophilus, Lactobacillus casei, Lactobacillus planatarum and Lactobacillus fermentus.
  • the composition comprises one, two, three, four, or more microorganisms from Bacillus sp. microorganisms.
  • the composition comprises one, two, three, four, or more microorganisms from Pseudomonas sp. microorganisms.
  • the composition comprises one, two, three, four, or more microorganisms from Bifidobacterium sp. microorganisms.
  • the composition comprises one, two, three, four, or more microorganisms from Lactobacillus sp. microorganisms.
  • the composition comprises one, two, three, four, or more microorganisms from Streptomyces sp. microorganisms.
  • the composition comprises one, two, three, four, or more microorganisms from Corynebacterium sp. microorganisms.
  • the selection of the microorganisms may be dependent on the type of organic waste that is to be treated.
  • the selected microorganisms may be combined with other additives to form the microorganism solution.
  • the microorganism content of the microorganism solution may comprise about 5% (vol) to about 50% (vol) microorganisms, about 10% (vol) to about 50% (vol) microorganisms, about 15% (vol) to about 50% (vol) microorganisms, about 20% (vol) to about 50% (vol) microorganisms, about 25% (vol) to about 50% (vol) microorganisms, about 30% (vol) to about 50% (vol) microorganisms, about 35 (vol) to about 50% (vol) microorganisms, about 40 (vol) to about 50% (vol) microorganisms, about 45% (vol) to about 50% (vol) microorganisms, about 5% (vol) to about 40% (vol) microorganisms, about 5% (vol) to about 30% (vol) microorganisms, about 5% (vol) to about 20 (vol) microorganisms, or about 5% (
  • the microorganism solution may further comprise additives and nutrients for the microorganisms that are useful for promoting growth of the microorganisms and enhancing their degradation or nitrogen fixation activity on the organic waste to thereby enhance the efficacy and efficiency of the disclosed process.
  • the additives may include biological catalysts (such as oxygenases and monooxygenases), buffers (such as phosphate buffer), diluents and surfactants (such as sorbitan, polysorbates, sorbitan esters and polyxamers).
  • nutrients typically included in the microorganism solution to enhance microbial growth and degradation activity include carbohydrates (such as glucose, fructose, maltose, sucrose, and starch); other carbon sources (such as mannitol, sorbitol and glycerol); nitrogen sources (such as urea, ammonium salts, amino acids or crude proteins, yeast extract, peptone, casein hydrolysates and rice bran extracts); and inorganic compounds (such as magnesium sulfate, sodium phosphate, potassium phosphate, sodium chloride, calcium chloride and ammonium nitrate).
  • carbohydrates such as glucose, fructose, maltose, sucrose, and starch
  • other carbon sources such as mannitol, sorbitol and glycerol
  • nitrogen sources such as urea, ammonium salts, amino acids or crude proteins, yeast extract, peptone, casein hydrolysates and rice bran extracts
  • inorganic compounds such as magnesium sulfate, sodium
  • the microorganism solution is preferably kept cool under refrigeration until just before application to the organic waste.
  • the microorganism solution may be kept at room temperature (i.e. at about 25° C.) for up to about 4 hours.
  • the microorganisms may be recovered by centrifugation, mixed with a protective agent or fillers such as calcium carbonate, corn grits, corn flour, defatted rice bran, wheat bran, skim milk powder, and the like, and then freeze-dried in vacuo.
  • a protective agent or fillers such as calcium carbonate, corn grits, corn flour, defatted rice bran, wheat bran, skim milk powder, and the like, and then freeze-dried in vacuo.
  • the resulting powder of the microorganisms can be re-suspended, mixed or dissolved in a suitable solvent prior to use.
  • the powder form of dry microorganisms is more stable, and can withstand long periods of storage and facilitates handling and transport.
  • the microorganism powder can further be processed into pellets or granules.
  • the microorganism powder may contain from about 1 ⁇ 10 10 viable microorganisms per gram of powder to about 15 ⁇ 10 10 viable microorganisms per gram of powder, from about 1 ⁇ 10 10 viable microorganisms per gram of powder to about 14 ⁇ 10 10 viable microorganisms per gram of powder, from about 1 ⁇ 10 10 viable microorganisms per gram of powder to about 13 ⁇ 10 10 viable microorganisms per gram of powder, from about 1 ⁇ 10 10 viable microorganisms per gram of powder to about 12 ⁇ 10 10 viable microorganisms per gram of powder, from about 1 ⁇ 10 10 viable microorganisms per gram of powder to about 11 ⁇ 10 10 viable microorganisms per gram of powder, from about 1 ⁇ 10 20 viable microorganisms per gram of powder to about 10 ⁇ 10 10 viable microorganisms per gram of powder, from about 1 ⁇ 10 10 viable microorganisms per gram of powder to about 9 ⁇ 10 10 viable microorganisms per gram of powder, from
  • the mixture of organic waste and microorganisms is treated for about 0.5 h to about 4 h, about 1 h to about 4 h, about 1.5 h to about 4 h, about 2 h to about 4 h, about 2.5 h to about 4 h, about 3 h to about 4 h, about 3.5 h to about 4 h, about 0.5 h to about 3.5 h, about 0.5 h to about 3 h, about 0.5 h to about 2.5 h, about 0.5 h to about 2 h, about 0.5 h to about 1.5 h, or about 0.5 h to about 1 h.
  • the mixture is treated for about 2 h.
  • the process may further comprise the step of aerating the organic waste, for example by pumping in air from air compressors during the treatment.
  • the air may be provided continuously during the treatment, or may be provided periodically according to a pre-determined regime.
  • the air may be pumped in for about 10 min to about 30 min, about 10 min to about 20 min, about 10 to about 15 min, about 15 min to about 30 min, or about 20 min to about 30 min, stopped for about to 10 min to 30 min, about 10 min to about 20 min, about 10 min to about 15 min, about 15 min to about 30 min, or about 20 to about 30 min, and pumped in again for about 10 min to about 30 min, about 10 min to about 20 min, about 10 min to about 15 min, about 15 min to about 30 min, or about 20 to about 30 min.
  • the air is pumped in for about 10 min, stopped for about 20 min, and pumped in again for about 10 min.
  • the process may be allowed to proceed for a period of time until the level of the compounds to be degraded or converted reaches the target level.
  • the process may be allowed to proceed until the NPK value reaches the target level of about 5 to about 12, about 6 to about 12, about 7 to about 12, about 8 to about 12, about 9 to about 12, about 10 to about 12, about 11 to about 12, about 5 to about 11, about 5 to about 10, about 5 to about 9, about 5 to about 8, about 5 to about 7, or about 5 to about 6.
  • a higher NPK value results in a more effective fertilizer in that a lesser amount of fertilizer is required to be used to promote plant growth compared to a fertilizer having a lower NPK value.
  • An organic fertilizer with a higher NPK value is therefore more cost-effective than an organic fertilizer with a lower NPK value.
  • the process may be allowed to proceed until the C:N ratio of the organic waste is reduced to a suitable range for use as organic fertilizer.
  • the C:N ratio of an organic waste Prior to conversion into fertilizer, the C:N ratio of an organic waste is typically high and unsuitable for use as fertilizer to promote plant growth. As the conversion process reaches maturity, the C:N ratio may be reduced from about 80:1 to about 20:1 depending on the organic waste(s) used as raw material.
  • the C:N ratio is reduced to a range of about 5:1 to about 30:1, about 6:1 to about 30:1, about 7:1 to about 30:1, about 8:1 to about 30:1, 9:1 to about 30:1, about 10:1 to about 30:1, about 11:1 to about 30:1, about 12:1 to about 30:1, about 13:1 to about 30:1, about 14:1 to about 30:1, about 15:1 to about 30:1, about 16:1 to about 30:1, about 17:1 to about 30:1, about 18:1 to about 30:1, about 19:1 to about 30:1, about 20:1 to about 30:1, about 21:1 to about 30:1, about 22:1 to about 30:1, about 23:1 to about 30:1, about 24:1 to about 30:1, about 25:1 to about 30:1, about 26:1 to about 30:1, about 27:1 to about 30:1, about 28:1 to about 30:1, about 29:1 to about 30:1, about 5:1 to about 29:1, about 5:1 to about
  • the treatment period required may depend on factors such as the initial NPK level and/or C:N ratio of the organic waste to be treated, the type and concentration of the microorganisms used, and the treatment conditions applied in the process. Typically, the treatment period is at least about 18 h.
  • the treatment period may be for example about 18 h to about 30 h, about 19 h to about 30 h, about 20 h to about 30 h, about 21 h to about 30 h, about 22 h to about 30 h, about 23 h to about 30 h, about 24 h to about 30 h, about 25 h to about 30 h, about 26 h to about 30 h, about 27 h to about 30 h, about 28 h to about 30 h, about 29 h to about 30 h, about 18 h to about 29 h, about 18 h to about 28 h, about 18 h to about 27 h, about 18 h to about 26 h, about 18 h to about 25 h, about 18 h to about 24 h, about 18 h to about 23 h, about 18 h to about 22 h, about 18 h to about 21 h, about 18 h to about 20 h, or about 18 h to about 19 h.
  • the treatment period is about 22 h.
  • the process may comprise the step of dosing the organic waste with a microorganism solution.
  • the microorganism solution may be one that has been prepared from a microorganism powder as described above.
  • the dosing promotes maintenance of the microorganism population during the prolonged treatment periods.
  • the dosing is undertaken in a dosing regime of applying microorganism solution to the organic waste about every 2 h to about every 5 h, about every 3 h to about every 5 h, about every 4 h to about every 5 h, about every 2 h to about every 4 h, or about every 2 h to about every 3 h.
  • the dosing regime undertaken may be determined based on such factors as the treatment load, the type of organic waste to be treated, the concentration of compounds in the organic waste to be degraded or converted, the time period within which treatment is to be completed and the concentration of the microorganisms in the solution.
  • the treated organic waste product is typically left to cool for about 2 h to about 6 h, about 3 h to about 6 h, about 4 h to about 6 h, about 5 h to about 6 h, about 2 h to about 5 h, about 2 h to about 4 h, about 2 h to about 3 h, about 3 h to about 5 h, or about 3 h to about 4 h. Cooling may be effected by sparging air to the treated organic waste.
  • the cooled organic waste is then typically allowed to age for about 1 day to about 5 days, 2 days to about 5 days, 3 days to about 5 days, 4 days to about 5 days, about 1 day to about 4 days, about 1 day to about 3 days, or about 1 day to about 2 days, to form an organic fertilizer product prior to being packaged.
  • the cooled organic waste is allowed to age for 2 days.
  • an organic fertilizer comprising an organic waste and a disclosed composition.
  • kits comprising a microorganism composition as defined above, and instructions for contacting the composition with an organic waste under conditions to at least partly convert the organic waste to organic fertilizer.
  • the kit may further comprise one or more additives or nutrients as defined above to enhance the growth of the microorganisms in the composition.
  • one or more compositions of microorganisms may be provided in a kit.
  • the disclosed process may be conducted in a system as disclosed herein.
  • the system may comprise stirring means for mixing an organic waste and a disclosed composition in a treatment zone.
  • the stirring means preferably comprise at least two arms located at different heights along the longitudinal axis of the treatment zone, wherein the at least two arms of the stirring means extend radially from the center of the treatment zone.
  • the arms of the stirring means may be of any shape or geometry that ensures that the organic waste and disclosed composition disposed at the bottom of the treatment zone are rapidly and well mixed with the organic waste and disclosed composition disposed at the top of the treatment zone, and that the mixture can achieve the desired temperature, moisture content and aeration level.
  • the arms may be curved, rectangular, square, U-shaped, inverted U-shaped, L-shaped, T-shaped, symmetrical, asymmetrical, flat, angled, helical, propeller-shaped, or notch-shaped.
  • the system may also comprise heating means for heating the organic waste in the pre-treatment step to decontaminate or remove unwanted microorganisms as described above.
  • the heating means may be any heat source that is capable of heating the organic waste located in the treatment zone.
  • the heating means may comprise one or more electrical heating elements, or one or more heat exchangers, through which, for example, heating oil is circulated.
  • the heating means may also comprise electric or gas heaters, or jets or hot air which can be directed specifically at the treatment zone.
  • the heating means may also be a waste heat source, a solar heat source or a geothermal heat source. Exemplary waste heat sources include flue gases from gas turbines in power plants and incinerators, process gases of chemical and metallurgical operations and waste heat from other industrial processes.
  • the heating means is capable of heating the organic waste to about 80° C. to about 175° C., about 90° C. to about 175° C., about 100° C. to about 175° C., about 110° C. to about 175° C., about 120° C. to about 175° C., about 130° C. to about 175° C., about 140° C. to about 175° C., about 150° C. to about 175° C., about 160° C. to about 175° C., about 170° C. to about 175° C., 80° C. to about 170° C., 80° C. to about 160° C., 80° C. to about 150° C., 80° C. to about 140° C., 80° C. to about 130° C., 80° C. to about 120° C., 80° C. to about 110° C., 80° C. to about 100° C., or 80° C. to about 90° C.
  • the system may further comprise a cooling means to reduce the temperature of the organic waste after the pre-treatment heating step so as not to kill the microorganisms in the composition that is to be added to the organic waste to treat the organic waste.
  • the cooling means may be a stream of cold nitrogen gas.
  • the cooling means is capable of reducing the temperature of the organic waste to about 35° C. to about 75° C., about 40° C. to about 75° C., about 45° C. to about 75° C., about 50° C. to about 75° C., about 55° C. to about 75° C., about 60° C. to about 75° C., about 65° C. to about 75° C., about 70° C. to about 75° C., about 35° C.
  • Each system may further be equipped with a temperature control unit to maintain the treatment zone at the required treatment temperature; moisture control means for maintaining the moisture level of the organic waste at a suitable level for treatment of the organic waste; a dryer, typically an air dryer, to dry the organic waste prior to being mixed with the microorganisms to remove excess moisture from the organic waste and achieve a desirable moisture content; aeration means for aerating the treatment zone during treatment of the organic waste; a control unit for controlling the stirring means, heating means, temperature control unit, moisture control means or aeration means; and a grinder for reducing the organic waste to a suitable particle size.
  • the ground particles may be passed through a sieve to separate out the particles having unsuitable sizes while retaining particles having the desirable sizes.
  • the particles having the desirable particles sizes may be stored in an organic waste container prior to being channeled into the treatment zone by a feeder, which may be, for example, a conveyor belt.
  • the disclosed process, composition, kit and system may be used to produce organic fertilizer from organic waste, increase the NPK value of an organic fertilizer, reduce the C:N ratio of an organic waste, increase the potassium value of an organic fertilizer, reduce odour of an organic waste, prevent leaching of nutrients from organic waste, or reduce waste accumulation.
  • FIG. 1 shows a schematic diagram of a system for treating organic waste according to one disclosed embodiment.
  • the system 100 comprises an input conveyor belt 102 for transporting an organic waste into a treatment zone 104 via an inlet 106 .
  • the treatment zone 104 is placed on a support 107 , and is equipped with heating means 108 and stirring means 109 .
  • the stirring means 109 has four arms 109 a, 109 b, 109 c and 109 d, located at two different heights and extending radially from the longitudinal axis 111 of the treatment zone 104 .
  • the stirring means are controlled by a motor 110 and a decelerator 110 a.
  • the treatment zone 104 is covered by cover 112 , which is equipped with an output conveyor belt 116 via outlet 114 .
  • a control unit 118 is also attached to the cover 112 .
  • the organic waste is transported by the input conveyor belt 102 into the treatment zone 104 via inlet 106 , the organic waste is heated to about 50° C. by the heating means 108 , and a composition of selected microorganisms is added.
  • the mixture of organic waste and microorganism composition is uniformly mixed by stirring means 109 , the rate of stirring being controlled by the motor 110 and a decelerator 110 a.
  • the treatment of the organic waste is allowed to proceed for 2 h.
  • the treated organic waste product is then removed from the treatment zone after 24 h by the output conveyor belt 116 via the outlet 114 .
  • 1 L of nutrient broth was prepared by mixing 10 g glucose, 8 g yeast extract and 5 g sodium chloride.
  • the nutrient broth was then inoculated with the selected microorganisms: Streptomyces pactum, Corynebacterium striatum, Bacillus pumilus, Bacillus stearothermophilus, Bacillus brevis, Bacillus cereus, Bacillus subtilis, Bacillus sphearieus, Bacillus licheniformis, Pseudomonas alcaligenes, Pseudomonas marinoglutinosa, Bifidobacterium thermophilus, Lactobacillus casei, Lactobacillus planatarum and Lactobacillus fermentus.
  • the nutrient broths inoculated with Streptomyces pactum, Corynebacterium striatum, Bacillus pumilus, Bacillus brevis, Bacillus cereus, Bacillus sphearieus, Pseudomonas alcaligenes, Pseudomonas marinoglutinosa, Lactobacillus casei, Lactobacillus planatarum and Lactobacillus fermentus were cultured at 37° C., while the nutrient broths inoculated with Bacillus stearothermophilus, Bacillus subtilis, Bacillus licheniformis, and Bifidobacterium thermophilus were cultured at 60° C.
  • Standard Kjeldahl's method (APHA 4500 N org B) was used to determine the total nitrogen content in the organic fertilizer.
  • ICP-AES inductively coupled plasma atomic emission spectroscopy
  • the organic carbon content was determined using the standard Loss on Ignition (LOI) method. A sample of the organic waste or organic fertilizer was weighed and its initial weight recorded. The sample was then placed in an oven at 350° C. for 3 hr. The sample was then cooled, re-weighed, and its final weight recorded. The organic carbon content was determined as follows:
  • the nitrogen content was determined using standard Kjeldahl's method (APHA 4500 N org B).
  • the C:N ratio was then determined as follows:
  • Raw chicken manure, dead chicken and chicken feathers were mixed with saw dust, ash, rice husks, rice straw, wheat straw, spent mushroom compost or corn cobs.
  • the initial moisture content of the organic waste mixture was adjusted to 35-60% (wt) for the first 6 h, and re-adjusted to and maintained at 15-20% (wt) thereafter.
  • the mixture was heated to 100-150° C. for the first 2 h, after which the mixture was cooled to 50-65° C.
  • the microorganism composition as prepared above was added to the mixture.
  • the NPK value of the organic fertilizer produced using the raw material composition in Example 1(a) was 6.
  • the C:N ratio of the raw material composition in Example 1(a) before treatment was 45:1. This was reduced to 20:1 after the 24 h treatment process.
  • the NPK value of the organic fertilizer produced using the raw material composition in Example 1(d) was 9.
  • the C:N ratio of the raw material composition in Example 1(d) before treatment was 42:1. This was reduced to 21:1 after the 24 h treatment process.
  • the NPK value of the organic fertilizer produced using the raw material composition in Example 1(e) was 9.
  • the C:N ratio of the raw material composition in Example 1(e) before treatment was 43:1. This was reduced to 20:1 after the 24 h treatment process.
  • the NPK value of the organic fertilizer produced using the raw material composition in Example 1(f) was 9.
  • the C:N ratio of the raw material composition in Example 1(f) before treatment was 42:1. This was reduced to 20:1 after the 24 h treatment process.
  • treatment of the organic waste compositions in Examples 1(a) to 1(f) all resulted in organic fertilizers with high NPK values of at least 6.
  • the initial C:N ratios of the organic waste compositions in Examples 1(a) to 1(f) ranging from 40:1 to 50:1 were all efficiently reduced to 19:1 to 22:1 after just 24 h.
  • Threshed EFP particles of 5-10 mm were mixed with chicken droppings, dead chickens, goat dung, POME, EFB ash and/or ash.
  • the initial moisture content of the organic waste mixture was adjusted to 35-60% (wt) for the first 6 h, and re-adjusted to and maintained at 15-20% (wt) thereafter.
  • the mixture was heated to 100-150° C. for the first 2 h, after which the mixture was cooled to 50-65° C.
  • the microorganism composition as prepared above was added to the mixture.
  • Raw Material % wt EFB (threshed) 70 Raw chicken manure 20 Ash 10
  • the NPK value of the organic fertilizer produced using the raw material composition in Example 2(a) was 6.
  • the C:N ratio of the raw material composition in Example 2(a) before treatment was 75:1. This was reduced to 27:1 after the 24 h treatment process.
  • the NPK value of the organic fertilizer produced using the raw material composition in Example 2(d) was 4.
  • the C:N ratio of the raw material composition in Example 2(d) before treatment was 85:1. This was reduced to 30:1 after the 24 h treatment process.
  • Raw Material % wt EFB (threshed) 50 POME sludge 50 The NPK value of the organic fertilizer produced using the raw material composition in Example 2(e) was 6.
  • the C:N ratio of the raw material composition in Example 2(e) before treatment was 73:1. This was reduced to 24:1 after the 24 h treatment process.
  • Food waste slurry and/or materials collected at the coarse screen station of a food processing plant were mixed with rice husks, rice straw, wheat straw, corn cobs, coffee bean husk, oil palm EFB, olive husk, fruit peels, wood chips, discarded vegetable, spent mushroom compost, spent orchid compost and/or flower cuttings.
  • the initial moisture content of the organic waste mixture was adjusted to 35-60% (wt) for the first 6 h, and re-adjusted to and maintained at 15-20% (wt) thereafter.
  • the mixture was heated to 100-150° C. for the first 2 h, after which the mixture was cooled to 50-65° C.
  • the microorganism composition as prepared above was added to the mixture.
  • the NPK value of the organic fertilizer produced using the raw material composition in Example 3(c) was 9.
  • the C:N ratio of the raw material composition in Example 3(c) before treatment was 45:1. This was reduced to 18:1 after the 24 h treatment process.
  • treatment of the organic waste compositions in Examples 3(a) to 3(c) all resulted in organic fertilizers with high NPK values of at least 6.
  • the organic waste compositions in Examples 3(b) and 3(c) in particular, resulted in organic fertilizers having higher NPK values of 9.
  • the initial C:N ratios of the organic waste compositions in Examples 3(a) to 3(c) ranging from 45:1 to 60:1 were all efficiently reduced to 18:1 to 22:1 after just 24 h.
  • the disclosed process for treating organic waste provides an improved process for producing organic fertilizer. More advantageously, the disclosed process substantially reduces the time required to produce organic fertilizers from several months as required using conventional composting methods to only one day or several days using the disclosed process, composition and system. Organic wastes having high C:N ratios may be rapidly converted to organic fertilizers with reduced C:N ratios after just 24 hours using the disclosed process, composition and system. This results in substantial reduction in energy and labour costs.
  • the disclosed process, composition and system substantially reduces, or completely eliminates, the foul odour of organic waste, to result in an organic fertilizer that is odourless.
  • the disclosed process for producing organic fertilizer from organic waste results in more effective organic fertilizers having increased NPK values.
  • the disclosed process also provides a solution to the waste disposal problem by converting organic waste into useful organic fertilizers.

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WO2015190908A1 (fr) * 2014-06-10 2015-12-17 Palmite Process Engineering Sdn Bhd Procédé de production d'engrais organiques dans des installations de production d'huile de palme utilisant une technologie verte
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