CN110551765A - method for anaerobic preparation of methane from landfill leachate - Google Patents
method for anaerobic preparation of methane from landfill leachate Download PDFInfo
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- CN110551765A CN110551765A CN201910821414.3A CN201910821414A CN110551765A CN 110551765 A CN110551765 A CN 110551765A CN 201910821414 A CN201910821414 A CN 201910821414A CN 110551765 A CN110551765 A CN 110551765A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000010802 sludge Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 230000014759 maintenance of location Effects 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 9
- 230000029087 digestion Effects 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 230000003203 everyday effect Effects 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 3
- 230000002354 daily effect Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 12
- 241000894006 Bacteria Species 0.000 abstract description 10
- 244000005700 microbiome Species 0.000 abstract description 7
- 230000027756 respiratory electron transport chain Effects 0.000 abstract description 7
- 239000004020 conductor Substances 0.000 abstract description 6
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 4
- 230000007062 hydrolysis Effects 0.000 description 6
- 238000006460 hydrolysis reaction Methods 0.000 description 6
- 230000020477 pH reduction Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 230000000696 methanogenic effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/284—Anaerobic digestion processes using anaerobic baffled reactors
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/34—Internal compartments or partitions
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/38—Caps; Covers; Plugs; Pouring means
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
- C12M27/18—Flow directing inserts
- C12M27/20—Baffles; Ribs; Ribbons; Auger vanes
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
-
- 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
- C02F2103/06—Contaminated groundwater or leachate
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Water Supply & Treatment (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for anaerobic preparation of methane from landfill leachate, which belongs to the field of methane preparation methods and comprises the steps of controlling the concentration of inlet water of the landfill leachate, inoculating anaerobic sludge in an anaerobic folded plate reactor, adding ferroferric oxide, comprehensively controlling relevant parameters and hydraulic retention time in the anaerobic folded plate reactor, detecting the relevant parameters in the anaerobic folded plate reactor, and determining the total gas production amount and the methane ratio in the anaerobic folded plate reactor. According to the invention, through the interaction of the ferroferric oxide conductive material and microorganisms in anaerobic sludge, the direct electron transfer process between conductive bacteria and methanogen in the anaerobic sludge is driven, the anaerobic preparation of methane by the landfill leachate is enhanced, and the efficient anaerobic treatment and the effective degradation of high-molecular refractory organic matters in the landfill leachate are realized.
Description
Technical Field
the invention relates to the field of methane preparation methods, and particularly belongs to a method for preparing methane by landfill leachate in an anaerobic manner.
background
landfill leachate is high-concentration organic wastewater produced by microbial action, rainwater leaching and long-term immersion of surface water and underground water during stacking and landfill of municipal domestic garbage. The components are complex, the pollutant concentration is high, the chroma is large, the toxicity is strong, and the method is a recognized problem in the water treatment industry at present. If not properly disposed of, not only will surface water be polluted, but also groundwater will be endangered.
the traditional mode for treating the landfill leachate by physical and chemical treatment has high operation cost, and the effluent quality gradually cannot meet the requirement of the increasingly improved discharge standard. Compared with physical and chemical methods, the biological treatment method is adopted for treating the landfill leachate at present. The aerobic biological treatment is difficult to keep stable when the water quality and the water quantity of the landfill leachate fluctuate, and the anaerobic biological treatment method has low treatment cost and stable treatment effect and can generate methane which can be recycled.
Because the organic matter components in the landfill leachate are complex, especially the high molecular refractory organic matter is more, the hydrolysis acidification stage is a difficult point in the anaerobic digestion process, and is also a main reason for causing the reduction of the COD of the landfill leachate to be difficult. The garbage leachate is difficult to be effectively treated by simply relying on an anaerobic biological treatment mode, and ferroferric oxide serving as a conductive material can interact with microorganisms, so that the hydrolysis and acidification process of macromolecular organic matters is accelerated by a direct electron transfer mode, and the generation of methane is pulled. Good effects are achieved at home and abroad by utilizing ferroferric oxide to promote simple organic matters such as propionic acid, butyric acid, ethanol and the like, but the research on promoting complex organic wastewater such as landfill leachate by utilizing ferroferric oxide is still blank.
according to the invention, an anaerobic folded plate reactor is coupled with ferroferric oxide, a hydrolysis acid-producing phase and a methanogenic phase in the anaerobic folded plate reactor are separated along the way, the biological phases have obvious population matching and good distribution along the way, and then the ferroferric oxide stimulates conductive bacteria to hydrolyze and acidify high-molecular refractory organic matters in the landfill leachate, so that the direct electron transfer process between the conductive bacteria and methanogenic bacteria is pulled, thus the anaerobic production of methane in the landfill leachate is strengthened, and the efficient anaerobic treatment of the landfill leachate is realized.
disclosure of Invention
the invention provides a method for preparing methane by anaerobic treatment of landfill leachate, which drives the direct electron transfer process between conductive bacteria and methanogen in anaerobic sludge through the interaction of ferroferric oxide conductive materials and microorganisms in the anaerobic sludge, strengthens the process for preparing methane by anaerobic treatment of landfill leachate, realizes efficient anaerobic treatment and efficient degradation of high-molecular refractory organic matters in the landfill leachate, and solves the problems mentioned in the background technology.
the technical scheme adopted by the invention is as follows:
A method for preparing methane by landfill leachate in an anaerobic way is characterized by comprising the following steps
Step one, landfill leachate influent concentration control: enabling the garbage leachate to flow into an anaerobic folded plate reactor through a water inlet pipeline of the anaerobic folded plate reactor, and ensuring that the chemical oxygen demand concentration of inlet water of the garbage leachate flowing into the anaerobic folded plate reactor is controlled within the range of 5000-10000 mg/L;
Step two, inoculating anaerobic sludge in the anaerobic folded plate reactor: the anaerobic folded plate reactor is a multi-cavity folded plate reactor, the number of the cavities is more than or equal to 3, activated sludge is heated in each cavity of the anaerobic folded plate reactor, the inoculated anaerobic sludge can be anaerobic granular sludge or anaerobic digestion sludge, the concentration of the inoculated sludge depends on the sludge load, and the anaerobic folded plate reactor is a moderate-temperature anaerobic reactor;
Step three, adding ferroferric oxide: adding ferroferric oxide into a front cavity of an anaerobic folded plate reactor, wherein the front cavity of the anaerobic folded plate reactor can be a first cavity or a second cavity or two cavities of the first cavity and the second cavity, the added ferroferric oxide is granular, the grain size range is 0.5-5 mm, the added ferroferric oxide is a carrier filler for loading the ferroferric oxide, and the adding amount of the ferroferric oxide is as follows: adding 10g of ferroferric oxide into each liter of anaerobic sludge;
Starting the anaerobic folded plate reactor, ensuring that the temperature in the anaerobic folded plate reactor is maintained at 35-37 ℃, wherein the pH value of the mixed solution is maintained at 7-8, the hydraulic retention time is maintained for 1-10 days, the hydraulic retention time of the anaerobic folded plate reactor is controlled to be the effective working volume (m 3) of the anaerobic folded plate reactor, and the ratio range of the water inflow rate (m 3/day) per day is 1-10 days;
Step five, detecting related parameters in the anaerobic folded plate reactor: detecting that the chemical oxygen demand concentration of the inlet water flowing into the anaerobic folded plate reactor is 5000-10000 mg/L, and respectively detecting the chemical oxygen demand concentration of the outlet water at the water outlet end of the anaerobic folded plate reactor after continuously running for 1 day, 3 days, 5 days, 8 days and 10 days, wherein the chemical oxygen demand concentration of the outlet water is not more than 200 mg/L;
Step six, determining the total gas production amount and the methane ratio in the anaerobic folded plate reactor: the total gas production amount and the methane ratio of the anaerobic folded plate reactor are measured every day, and the number of continuous operation days is not less than 10 days after continuous operation.
preferably, the anaerobic folded plate reactor comprises a reactor main body, a rubber sealing ring and a reactor cover body, wherein the rubber sealing ring is arranged between the reactor cover body and the reactor main body, the reactor cover body is in threaded connection with the upper top surface of the reactor main body, the reactor main body is provided with four cavities, a folded plate interval and a vertical plate interval are arranged between the two cavities, a detachable porous plate is longitudinally arranged at the level of the folded plate interval of every two cavities, the side surface of the reactor main body is provided with a sampling port, a ball valve is arranged in the sampling port, an interface through hole with internal threads is arranged on the reactor cover body, and a pipeline or a plug or a valve with external threads is arranged in the interface through hole on the reactor cover.
Preferably, the side surface of the reactor main body is provided with three sampling ports, each layer is provided with four sampling ports, the sampling ports of each layer respectively correspond to the side surface of the chamber of the reactor main body, and the four sampling ports of each layer are identical in height.
Compared with the prior art, the invention has the following beneficial effects:
The invention develops a method for preparing methane by anaerobic treatment of landfill leachate, which drives the direct electron transfer process between conductive bacteria and methanogen in anaerobic sludge through the interaction of ferroferric oxide conductive materials and microorganisms in anaerobic sludge, strengthens the anaerobic preparation of methane by landfill leachate, and realizes efficient anaerobic treatment and effective degradation of high-molecular refractory organic matters in the landfill leachate. Compared with the prior art:
(1) the invention adopts the anaerobic folded plate reactor, has the characteristics that the hydrolysis acid-producing phase and the methane-producing phase are separated along the way, the biological phase has obvious population matching and good along-the-way distribution, and utilizes the advantages of ferroferric oxide for strengthening hydrolysis acid bacteria and promoting the direct transfer of electrons between anaerobic microorganism species to realize the combination of the advantages of the ferroferric oxide and the anaerobic microorganism, thereby strengthening the anaerobic production of methane in the landfill leachate by exerting the synergistic effect.
(2) the ferroferric oxide serving as a conductive material can stimulate conductive bacteria, hydrolyze and acidify high-molecular refractory organic matters in the landfill leachate, and pull a direct electron transfer process between the conductive bacteria and methanogens, so that the methane production effect of the landfill leachate is enhanced.
(3) By adding ferroferric oxide into the anaerobic folded plate reactor, the hydrolysis acidification process of high-molecular refractory organic matters in the anaerobic digestion process of the landfill leachate can be strengthened, so that the biodegradability of the landfill leachate is improved, and good water quality conditions are created for the subsequent biochemical treatment of the landfill leachate.
drawings
FIG. 1 is a schematic view of the overall working process of the present invention;
FIG. 2 is a schematic front view of a reactor body, a rubber seal ring and a reactor cover in an anaerobic folded plate reactor according to the present invention;
FIG. 3 is a left side view of the reactor main body, the rubber sealing ring and the reactor cover in the anaerobic folded plate reactor according to the present invention;
FIG. 4 is a right-side view schematically illustrating a reactor main body, a rubber seal ring and a reactor cover in the anaerobic folded plate reactor according to the present invention;
FIG. 5 is a schematic top view of the anaerobic baffled reactor of the present invention in its entirety;
FIG. 6 is a schematic vertical longitudinal sectional front view of an anaerobic baffled reactor according to the present invention;
FIG. 7 is a schematic top view of a removable perforated plate in an anaerobic baffled reactor of the present invention;
FIG. 8 is a graph showing the chemical oxygen demand concentration of influent landfill leachate in anaerobic flap reactors compared to the chemical oxygen demand concentration of effluent landfill leachate in anaerobic flap reactors for greater than 80 consecutive days according to relevant parameters of the present invention in an example.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail with reference to examples and specific embodiments.
Referring to attached drawings, a method for preparing methane by landfill leachate in an anaerobic way is characterized by comprising the following steps
step one, landfill leachate influent concentration control: enabling the landfill leachate to flow into an anaerobic folded plate reactor (1) through a water inlet pipeline of the anaerobic folded plate reactor (1), and ensuring that the chemical oxygen demand concentration of inlet water of the landfill leachate flowing into the anaerobic folded plate reactor (1) is controlled within the range of 5000-10000 mg/L;
Step two, inoculating anaerobic sludge in the anaerobic folded plate reactor (1): the anaerobic folded plate reactor (1) is a multi-cavity folded plate reactor, the number of the cavities is more than or equal to 3, activated sludge is heated in each cavity of the anaerobic folded plate reactor (1), the inoculated anaerobic sludge can be anaerobic granular sludge or anaerobic digested sludge, the concentration of the inoculated sludge is according to the sludge load, and the anaerobic folded plate reactor (1) is a moderate-temperature anaerobic reactor;
Step three, adding ferroferric oxide: adding ferroferric oxide into a front cavity of an anaerobic folded plate reactor (1), wherein the front cavity of the anaerobic folded plate reactor (1) can be a first cavity or a second cavity or two cavities (1014) of the first cavity and the second cavity, the added ferroferric oxide is granular, the particle size range is 0.5-5 mm, the added ferroferric oxide is a carrier filler for loading the ferroferric oxide, and the adding amount of the ferroferric oxide is as follows: adding 10g of ferroferric oxide into each liter of anaerobic sludge;
starting the anaerobic folded plate reactor (1), ensuring that the temperature in the anaerobic folded plate reactor (1) is maintained at 35-37 ℃, wherein the pH value of the mixed solution is maintained at 7-8, the hydraulic retention time is maintained at 1-10 days, controlling the hydraulic retention time of the anaerobic folded plate reactor (1) to be the effective working volume (m 3) of the anaerobic folded plate reactor, and controlling the ratio range of the water inflow rate (m 3/day) per day to be 1-10 days;
step five, detecting related parameters in the anaerobic folded plate reactor (1): detecting that the effluent flows into the anaerobic folded plate reactor (1), wherein the chemical oxygen demand concentration of the influent of the landfill leachate is in a range of 5000-10000 mg/L, and the chemical oxygen demand concentration of the effluent at the water outlet end of the anaerobic folded plate reactor (1) is not more than 200mg/L after the effluent is continuously operated for 1 day, 3 days, 5 days, 8 days and 10 days;
Step six, determining the total gas production amount and the methane ratio in the anaerobic folded plate reactor (1): the total gas production amount and the methane ratio of the anaerobic folded plate reactor (1) are measured every day, and the number of continuous operation days is not less than 10 days after continuous operation.
Preferably, the anaerobic folded plate reactor (1) comprises a reactor main body (101), a rubber sealing ring (102) and a reactor cover body (103), wherein the rubber sealing ring (102) is arranged between the reactor cover body (103) and the reactor main body (101), the reactor cover body (103) is arranged on the upper top surface of the reactor main body (101) in a threaded manner, the reactor body (101) is provided with four chambers (1014), a flap interval (1012) and a vertical plate interval (1013) are arranged between the two chambers (1014), a detachable perforated plate (1015) is horizontally and longitudinally arranged at the flap interval (1012) of each two chambers (1014), a sampling port (1011) is arranged on the side surface of the reactor main body (1), a ball valve is arranged in the sampling port (1011), an interface through hole (1031) with internal threads is arranged on the reactor cover body (103), and a pipeline or a plug or a valve with external threads is arranged in the interface through hole (1031) on the reactor cover body (103).
preferably, the side surface of the reactor main body (101) is provided with three sampling ports (1011) which are provided with four sampling ports (1011) in each layer, the sampling ports (1011) in each layer correspond to the side surface of the chamber (1014) of the reactor main body (101), and the four sampling ports (1011) in each layer are the same in height.
when the method is implemented, ferroferric oxide is utilized in an anaerobic folded plate reactor (1) to promote anaerobic digestion of garbage percolate and recover methane, the reactor is the anaerobic folded plate reactor (1) and consists of four anaerobic reaction chambers (1014), and activated sludge with the concentration of 10g MLVSS/L is arranged in the reactor. The temperature in the anaerobic folded plate reactor (1) is maintained at 35-37 ℃, the pH value of the mixed solution is maintained at 7-8, and the hydraulic retention time is maintained at 1 day, 3 days, 5 days, 8 days and 10 days respectively.
The method comprises the following steps: and (3) controlling the concentration of the inlet water of the landfill leachate: enabling the landfill leachate to flow into the anaerobic folded plate reactor (1) through a water inlet pipeline of the anaerobic folded plate reactor (1) through a water pump, ensuring that the Chemical Oxygen Demand (COD) concentration of inlet water of the landfill leachate flowing into the anaerobic folded plate reactor (1) is controlled within the range of 5000-10000 mg/L;
step two: anaerobic sludge is inoculated in the anaerobic folded plate reactor (1): the anaerobic folded plate reactor (1) is a four-chamber folded plate reactor, activated sludge is heated in each chamber (1014) of the anaerobic folded plate reactor (1), activated sludge with the concentration of 10g MLVSS/L is arranged in the anaerobic folded plate reactor, and the concentration of inoculated sludge accords with the sludge load;
step three: adding ferroferric oxide: adding ferroferric oxide particles with the particle size range of 0.5-5 mm into a first chamber and a second chamber in a folded plate reactor, wherein the concentration of the added ferroferric oxide is 10g/L, and the ferroferric oxide is in a powder particle shape, so that the aim of really promoting the hydrolytic acidification process by the ferroferric oxide in the folded plate reactor which can realize the methane production functional subarea by the hydrolytic acidification is fulfilled;
step four: comprehensively controlling relevant parameters and hydraulic retention time in the anaerobic folded plate reactor (1): starting the anaerobic folded plate reactor (1), ensuring that the temperature in the anaerobic folded plate reactor (1) is maintained at 35-37 ℃, wherein the pH of the mixed solution is maintained at 7-8, and the hydraulic retention time is maintained at 1-10 days;
Step five, detecting related parameters in the anaerobic folded plate reactor (1): detecting that the chemical oxygen demand concentration of inlet water flowing into the anaerobic folded plate reactor (1) is 5000-10000 mg/L, continuously operating for 1 day, 3 days, 5 days, 8 days and 10 days, respectively detecting the water outlet end of the anaerobic folded plate reactor (1), measuring the Chemical Oxygen Demand (COD) concentration of the outlet water, calculating the COD removal rate of the reactor, and operating for 80 days to finally stabilize the COD concentration of the outlet water to be not more than 200mg/L and ensure that the COD removal rate reaches more than 96% (as shown in figure 7).
step six, determining the total gas production amount and the methane ratio in the anaerobic folded plate reactor (1) in the step five: the total gas production amount and the methane ratio of the anaerobic folded plate reactor (1) are measured every day, and after running for 80 days continuously, the total gas production amount averagely reaches 960mL/d, wherein the methane ratio is 85%. Therefore, the invention meets the requirements of original research and development and achieves the aim of original research and development.
according to the invention, through the interaction of the ferroferric oxide conductive material and microorganisms in anaerobic sludge, the direct electron transfer process between conductive bacteria and methanogen in the anaerobic sludge is driven, the anaerobic preparation of methane by the landfill leachate is enhanced, and the efficient anaerobic treatment and the effective degradation of high-molecular refractory organic matters in the landfill leachate are realized.
the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (3)
1. A method for preparing methane by landfill leachate in an anaerobic way is characterized by comprising the following steps
1) And (3) controlling the concentration of the inlet water of the landfill leachate: enabling the garbage leachate to flow into an anaerobic folded plate reactor through a water inlet pipeline of the anaerobic folded plate reactor, and ensuring that the chemical oxygen demand concentration of inlet water of the garbage leachate flowing into the anaerobic folded plate reactor is controlled within the range of 5000-10000 mg/L;
2) Inoculating anaerobic sludge in the anaerobic folded plate reactor: the anaerobic folded plate reactor is a multi-cavity folded plate reactor, the number of the cavities is more than or equal to 3, activated sludge is heated in each cavity of the anaerobic folded plate reactor, the inoculated anaerobic sludge can be anaerobic granular sludge or anaerobic digestion sludge, the concentration of the inoculated sludge depends on the sludge load, and the anaerobic folded plate reactor is a moderate-temperature anaerobic reactor;
3) adding ferroferric oxide: adding ferroferric oxide into a front cavity of an anaerobic folded plate reactor, wherein the front cavity of the anaerobic folded plate reactor can be a first cavity or a second cavity or two cavities of the first cavity and the second cavity, the added ferroferric oxide is granular, the grain size range is 0.5-5 mm, the added ferroferric oxide is a carrier filler for loading the ferroferric oxide, and the adding amount of the ferroferric oxide is as follows: adding 10g of ferroferric oxide into each liter of anaerobic sludge;
4) starting the anaerobic folded plate reactor, ensuring that the temperature in the anaerobic folded plate reactor is maintained at 35-37 ℃, wherein the pH value of the mixed solution is maintained at 7-8, the hydraulic retention time is maintained for 1-10 days, controlling the hydraulic retention time of the anaerobic folded plate reactor to be the effective working volume (m 3) of the anaerobic folded plate reactor, and controlling the ratio of the effective working volume (m 3/day) to the daily inflow water flow (m 3/day) to be 1-10 days;
5) Detecting related parameters in the anaerobic folded plate reactor: detecting that the chemical oxygen demand concentration of the inlet water flowing into the anaerobic folded plate reactor is 5000-10000 mg/L, and respectively detecting the chemical oxygen demand concentration of the outlet water at the water outlet end of the anaerobic folded plate reactor after continuously running for 1 day, 3 days, 5 days, 8 days and 10 days, wherein the chemical oxygen demand concentration of the outlet water is not more than 200 mg/L;
6) Determining the total gas production amount and the methane ratio in the anaerobic folded plate reactor: the total gas production amount and the methane ratio of the anaerobic folded plate reactor are measured every day, and the number of continuous operation days is not less than 10 days after continuous operation.
2. the method for anaerobic preparation of methane from landfill leachate according to claim 1, wherein the anaerobic folded plate reactor comprises a reactor body, a rubber seal ring and a reactor cover, the rubber seal ring is installed between the reactor cover and the reactor body, the reactor cover is installed on the top surface of the reactor body in a threaded manner, the reactor body has four chambers, a folded plate space and a vertical plate space are provided between two chambers, a detachable perforated plate is horizontally and longitudinally installed between every two chambers, a sampling port is provided on the side surface of the reactor body, a ball valve is installed in the sampling port, an interface through hole with internal threads is provided on the reactor cover, and a pipe or a plug or a valve with external threads is installed in the interface through hole on the reactor cover.
3. The method for anaerobic preparation of methane from landfill leachate according to claim 2, wherein the side of the reactor body has three layers of sampling ports, each layer has four sampling ports, the sampling ports of each layer correspond to the side of the chamber of the reactor body, and the four sampling ports of each layer have the same height.
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