Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/12—Activated sludge processes
  • C02F3/1205—Particular type of activated sludge processes
  • C02F3/121—Multistep treatment
• • 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
  • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F11/00—Treatment of sludge; Devices therefor
  • C02F11/02—Biological treatment
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
  • C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/10—Biological treatment of water, waste water, or sewage
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • 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
  • Y02W10/20—Sludge processing

Definitions

• the invention relates to a method for treating liquid manure or biogas plant reject (subsequently a slurry type matter) biologically for the removal of odor and/or the removal of nitrogen, said method comprising
• the invention relates also to an apparatus for treating liquid manure or biogas plant reject (subsequently a slurry type matter) biologically for the removal of odor and/or the removal of nitrogen, said apparatus comprising
• a supply tank for collecting a slurry type matter and for the separation of coarse matter by sedimentation and/or by a sieve - a first bioreactor tank for a microbiological process or its initiation a second bioreactor tank for a microbiological process
• the odor problem created by liquid manure is a recognized problem, which has been studied but to which a completely successful solution is yet to be found.
• the invention involves working up a microbe community, which is isolated from soil and adapted to the treatment of liquid manure.
• the soil, from which the isolation has been effected has been in cultivation for decades and has been fertilized with liquid manure.
• the microbe community used in the invention does not contain genetically engineered organisms, but it has evolved through inherently spontaneous mutations, natural selection, as well as genetic combinations.
• the fertilizer use of liquid manure and a biogas plant's final digest or reject there is another problem regarding the fertilizer use of liquid manure and a biogas plant's final digest or reject.
• liquid manure nitrogen may be lost in gaseous nitrogen emissions either during storage, at the moment of spreading or immediately after the spreading in the form of ammonia gas discharges or by way of denitrification in the form of nitrogen oxides and/or nitrogen gas. Because the nitrogen fertilizing impact of liquid manure and biogas plant reject is hard to assess, there is a demand for methods which enable the concentration or separation of nitrogen from a liquid fraction and/or the conversion of liquid manure nitrogen into such a form that enables utilizing the fertilizing value of liquid manure nitrogen as effectively as possible and thereby reducing the need of using mineral fertilizers.
• a slurry type matter containing all of its fiber and at the same time also its organic solids, is conveyed into bioreactor tanks, this assists in the creation and upkeep of optimal conditions for the worked-up microbe commu- nity.
• the slurry type matter can be maintained in a sufficiently fluid state in order to enable avoiding blockages in nitrogen removal equipment, such as in a stripping column, into which the slurry type mass, having been treated with a method and apparatus of the invention, can be conveyed.
• the odor reducing effect achieved by a method and apparatus of the invention is particularly based on the conversion of an organic solid matter by means of a biological process, thereby suppressing the buildup of odors.
• the requirement is a sufficiently effective separation of solids.
• the readily degradable organic matter is primarily contained in the finest-of-all solid fraction. Now, this solid fraction arrives, according to the invention, in a microbiological treatment, resulting in the sedimentation of therein precipitating crystals which can be discharged, according to the invention, on a mechanical conveyor from the bioreactor tanks.
• the invention makes use of a per se known method for reducing odor by the aeration of liquid manure.
• This prior known method is based on producing a sufficient amount of dissolved oxygen for aerobic bacteria present in liquid manure, the bacteria using, as a source of energy for themselves, compounds known as odo- rants, such as compounds containing organic acids, phenols, indoles, nitrogen and sulphur, and the like small-molecule compounds.
• odo- rants such as compounds containing organic acids, phenols, indoles, nitrogen and sulphur, and the like small-molecule compounds.
• the odorants metabolize or break up in the metabolism.
• microbial mass which gathers on the bottom of a bioreactor tank and which may impede the treatment unless such mass is removed.
• Hg. 1 is a schematic view, showing an apparatus of the invention.
• Rg. 2 is a perspective view, showing bioreactor tanks and a conveyor associated therewith for removing solids from the tanks.
• Fig. 3 shows a section taken across the bottom of a bioreactor tank of fig. 2
• Fig. 4 shows more closely a part of the solid matter conveyor, at which the solid matter is removed from the conveyor.
• Liquid manure and a biogas plant's final digest or reject are both subsequently referred to as slurry.
• the slurry is fed by a pump 1 into a supply tank 3, in which the separation of coarse matter is performed by sedimentation and/or a sieve. The question is only about removing the largest solid particles in order to prevent the same from causing blockages in further processing.
• the slurry is fed by a pump 4 into a first bioreactor tank 5 for a microbiological process or its initiation. The process is not started until all the bioreactor tanks 5 are filled with an appropriate amount of microbial mass, which has been composed of a mi- crobe population worked up as described earlier.
• the slurry is fed by overflow through a pipe 14 visible in fig. 2 into a second bioreactor tank 5, in which the worked-up microbe population has already replaced and, while growing during the process, keeps replacing the original microbe population of the slurry type matter.
• the feeding rate must be controlled in a way to allow enough time for said replacement.
• the slurry present in the first bioreactor tank 5 must be continuously "diluted" with a biologically processed slurry which is fed back from a final bioreactor tank 5 or from a point after an ammonia stripping column 16 disposed downstream thereof. This feedback rate can be regulated by controlling the output of a pump 8 or by means of valve systems.
• the minimum requirement is two bioreactor tanks.
• Other tanks 5, the number of which is as desired, are present for enhancing and speeding up the proc- ess.
• the slurry present in the bioreactor tanks 5 is aerated by introducing air from a compressed air source 2 by way of a pipe 6 into every tank 5.
• the amount of aeration air is independently regulable in each bioreactor tank S 1 for example by means of a valve 6b visible in fig. 3.
• the regulation can be manual or computer-controlled.
• the process-generated gases are expelled from top of the tanks 5 into a header pipe 7 and further by means of a discharge pump 7a either to the atmosphere or a special deodorization treatment.
• the apparatus includes three or more bioreactor tanks 5, which are connected for a mutual flow communication by way of pipes 14, such that the slurry proceeds from tank to tank by way of an overflow.
• Said feedback pipe 8a along with its pump 8, extends between the last and first bioreactor tanks 5 or, if there is an ammonia stripping column 16 downstream of the last tank 5, the pipe 8a is connected to an equalization tank 16a downstream thereof.
• the bottoms of the at least first two bioreactor tanks 5 are designed in a tapering V- shape and the bottom is provided with a mechanical conveyor 10 for the removal of sedimenting solids.
• the mechanical conveyor 10 is a flight conveyor, especially a flight chain conveyor, extending in the form of a continuous, endless conveyor through one or more successive bioreactor tanks 5.
• each tank 5 can have its own conveyor or not less than two tanks can have a common conveyor 10.
• all six tanks 5 share a common conveyor 10, proceeding in a spiral manner from tank to tank. In tight corners, the conveyor 10 has been passed over idler wheels.
• the conveyor 10 is housed in a pipe 11 whose horizontal upper run includes an opening 12 (fig. 4) for the removal of solids.
• the pipe 11 is set up at a height sufficient for not connecting the bioreactor tanks in a way of communicating vessels and for bringing along as little liquid as possible to the discharge opening 12.
• the discharge opening 12 must be located at a higher level than the upstream end of the overflow pipe 14.
• the conveyor 10 is driven con- tinuously or intermittently as a continuous endless conveyor through one or more successive bioreactor tanks 5.
• the conveyor 10 is located in a channel 13 which is open at the top.
• a remover 15 which includes a weight or hammer 18, which is present at the end of an arm 17 pivotable about an axle 16 and which rises upwards as a flight 10a of the conveyor proceeding in a direction A pushes ahead of itself a bell-crank lever 19 engaged with the arm 17.
• the weight or hammer 18 falls upon the conveyor and delivers to it a strike or jolt sufficient for disengaging the solid matter and the conveyor 10 proceeds forward in an unloaded condition.
• the remover 15 has its frame provided with an adjustment recess 20 for shifting the pivot axle 16 to an appropriate location for a strike delivered by the weight or hammer 18.
• the last bioreactor tank 5 can be followed by an ammonia separating device, especially a so-called stripping column 16, from which the slurry is pumped by a pump 9 to further processing equipment (not shown), in which the slurry is treated with chemicals and the removal of nitrogen is continued.
• the expelled solids can be dried further with a press and treated e.g. by composting.
• the method and apparatus according to the invention have already been tested, and it has been found in the tests that, by providing the above-described conditions, the worked-up microbe population can be brought to replace the original microbe population of a slurry for the most part as early as in the second bioreactor tank 5, whereafter the buildup of odor is substantially lesser and it is possible to raise the slurry's pH with a microbial treatment alone to the value of not less than 8,8. This, in turn, promotes the removal of nitrogen and reduces the number of chemical additions required in the removal of nitrogen. This is based on the fact that, when the pH of liquid manure is raised in a previously known manner, the result is a conversion of ammonium nitrogen contained therein into ammonia.
• the conveyor 10 can be a combination of horizontal and vertical screw conveyors, whereby the horizontal screw is on the bottom of the tank 5 and the vertical screw outside the tank 5.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Biodiversity & Conservation Biology (AREA)
• Microbiology (AREA)
• Hydrology & Water Resources (AREA)
• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Treatment Of Sludge (AREA)
• Treating Waste Gases (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39385996

Family Applications (1)

Country Status (2)

Citations (5)

• 2008
  • 2008-04-25 FI FI20085373A patent/FI20085373A0/fi not_active Application Discontinuation
• 2009
  • 2009-04-21 WO PCT/FI2009/050305 patent/WO2009130385A1/en active Application Filing

Patent Citations (5)

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