CN107487882B - Biogas slurry concentration system and method - Google Patents
Biogas slurry concentration system and method Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
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- C02F2301/00—General aspects of water treatment
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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- 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
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- 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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Abstract
The invention discloses a biogas slurry concentration system and a method, which comprises an original biogas slurry pool, an original delivery pump, an adjusting pool, a fine grid, an adjusting delivery pump, a primary raw water tank, a concentrated water pool, a primary delivery pump, a primary precision filter, a primary filtering membrane, a secondary raw water tank, a secondary delivery pump, a secondary precision filter, a secondary high-pressure pump, secondary material membrane separation equipment, a tertiary raw water tank, a tertiary delivery pump, a tertiary precision filter, a tertiary high-pressure pump, tertiary material membrane separation equipment, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quaternary high-pressure pump, quaternary high-pressure material membrane separation equipment, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quinary high-pressure pump, a quinary high-pressure material membrane separation equipment, a quinary raw water tank, a quinary delivery pump, a six-grade precision filter, a six-grade material membrane separation equipment, an acid delivery pump, an acid solution storage equipment. The grading and high-power concentration of the effective components in the biogas slurry are realized, and the ammonia nitrogen is completely extracted.
Description
Technical Field
The invention relates to the technical field of biogas slurry resource utilization, in particular to a biogas slurry concentration system and a biogas slurry concentration method.
Background
Anaerobic fermentation of livestock and poultry feces can generate a large amount of biogas slurry, belongs to high pollutants, cannot be directly discharged into the environment, and standard treatment is carried out through post-construction treatment facilities, so that the construction and operation cost is greatly increased, and therefore, the serious problem of digestion exists. In fact, the biogas slurry contains rich nitrogen, phosphorus, potassium, amino acid, rich trace elements, B vitamins, various hydrolases, organic acid, humic acid and other bioactive substances, is a good organic fertilizer, stimulates the growth of crops, enhances the stress resistance of the crops and improves the product quality. Therefore, the biogas slurry can be used as an organic fertilizer to realize secondary utilization of resources. However, the problems of uneven utilization space-time distribution and economy such as insufficient digestion capacity of nearby farmlands, small utilization amount in winter, overhigh remote transportation cost and the like exist, and meanwhile, compared with chemical fertilizers or commercial organic fertilizers, the concentration of various nutrient elements in biogas slurry is low, the enthusiasm of farmers for utilization is not high, and the feasibility of agricultural digestion is limited to a certain extent. The difficulty in dissolving the biogas slurry also directly limits the popularization and long-term efficient and stable operation of the biogas project.
Aiming at the problems of large biogas slurry yield, high treatment cost, difficult storage and transportation, low content of nutrient substances and the like, the biogas slurry can be concentrated. At present, the biogas slurry concentration treatment process has the following problems:
1. nutrient substances in the biogas slurry are not separated, and all the nutrient substances are concentrated together, so that the nutrient substances in the biogas slurry cannot be efficiently utilized.
2. The biogas slurry concentration multiple is low, and the content of active ingredients in unit volume is not high, so that the long-distance transportation cost is too high, and the biogas slurry can not be applied in a large range.
3. The subsequent evaporation process has large initial investment and high operation cost.
Disclosure of Invention
The invention aims to provide a biogas slurry concentration system and a biogas slurry concentration method, which are used for solving the defects in the prior art.
The invention adopts the following technical scheme:
a biogas slurry concentration system comprises an original biogas slurry pool, an original delivery pump, an adjusting pool, a fine grid, an adjusting delivery pump, a primary raw water tank, a concentrated water tank, a primary delivery pump, a primary precision filter, a primary filtering membrane, a secondary raw water tank, a secondary delivery pump, a secondary precision filter, a secondary high-pressure pump, a secondary material membrane separation device, a tertiary raw water tank, a tertiary delivery pump, a tertiary precision filter, a tertiary high-pressure pump, a tertiary material membrane separation device, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quaternary high-pressure pump, a quaternary high-pressure material membrane separation device, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quaternary high-pressure pump, a quinary delivery pump, a quinary precision filter, a quinary high-pressure pump, a quinary high-pressure material membrane separation device, a quinary raw water tank, a quinary delivery pump, a quinary precision filter, a non-volatile acid solution storage device,
the first-stage filtering membrane comprises a ceramic membrane, a metal membrane or a tubular ultrafiltration membrane, and the aperture is 30-200nm; the second-level material membrane separation equipment is a roll-type ultrafiltration membrane, the filtration molecular weight of the roll-type ultrafiltration membrane is 1000-3000D, and humic acid and macromolecular organic matters can be intercepted; the three-stage material membrane separation equipment is a rolled nanofiltration membrane, the filtration molecular weight of the rolled nanofiltration membrane is 100-300D, and small molecular organic matters can be intercepted; the four-stage high-pressure material membrane separation equipment is a disc-tube type nanofiltration membrane, and MgSO (MgSO) of the disc-tube type nanofiltration membrane 4 Retention rate>97 percent; the five-stage high-pressure material membrane separation equipment is a disc-tube type reverse osmosis membrane, and the NaCl rejection rate of the disc-tube type reverse osmosis membrane>98.5 percent; the six-stage material membrane separation equipment main body is an ammonia nitrogen absorber;
the raw biogas slurry tank is connected with an adjusting tank through a raw conveying pump, a fine grid is arranged behind the adjusting tank, and the fine grid is connected with a primary raw water tank through an adjusting conveying pump; the concentrated water outlet of the primary raw water tank is connected with the concentrated water tank, the primary raw water tank is connected with the primary filtering membrane through a primary delivery pump and a primary precision filter, the intercepted liquid outlet of the primary filtering membrane is connected with the primary raw water tank, and the permeated liquid outlet of the primary filtering membrane is connected with the secondary raw water tank;
the second-stage raw water tank is connected with a second-stage material membrane separation device through a second-stage delivery pump, a second-stage precision filter and a second-stage high-pressure pump, a trapped liquid outlet of the second-stage material membrane separation device is connected with the fourth-stage raw water tank, and a permeate liquid outlet of the second-stage material membrane separation device is connected with the third-stage raw water tank;
the four-stage raw water tank is connected with four-stage high-pressure material membrane separation equipment through a four-stage delivery pump, a four-stage precision filter and a four-stage high-pressure pump, and a trapped liquid outlet of the four-stage high-pressure material membrane separation equipment is connected with the four-stage raw water tank;
the three-stage raw water tank is connected with three-stage material membrane separation equipment through a three-stage delivery pump, a three-stage precision filter and a three-stage high-pressure pump, and a trapped fluid outlet of the three-stage material membrane separation equipment is connected with the five-stage raw water tank;
the five-stage raw water tank is connected with the five-stage high-pressure material membrane separation equipment through a five-stage delivery pump, a five-stage precision filter, a five-stage high-pressure pump, a trapped liquid outlet of the five-stage high-pressure material membrane separation equipment is connected with the five-stage raw water tank,
a permeate liquid outlet of the four-stage high-pressure material membrane separation equipment, a permeate liquid outlet of the three-stage material membrane separation equipment and a permeate liquid outlet of the five-stage high-pressure material membrane separation equipment are connected to a six-stage raw water tank;
the six-stage raw water tank is connected with the six-stage material membrane separation equipment through the six-stage delivery pump and the six-stage precision filter, the non-volatile acid solution storage equipment is connected with the non-volatile acid solution inlet of the six-stage material membrane separation equipment through the acid delivery pump and the acid precision filter, and the ammonium salt outlet of the six-stage material membrane separation equipment is connected with the non-volatile acid solution storage equipment.
Further, the ammonia nitrogen absorber comprises a degassing membrane.
Further, the non-volatile acid solution storage device comprises a phosphoric acid solution storage device or a sulfuric acid solution storage device.
Furthermore, the aperture of the fine grid is 5-10mm; the aperture of the primary precision filter is 0.8-2mm, and the material comprises stainless steel; the aperture of the secondary precision filter is 1-10um, and the material comprises PP material; the aperture of the three-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the four-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the five-stage precision filter is 1-10um, and the material comprises PP material; the aperture of the six-stage precision filter is 1-10um, and the material comprises a PP material.
Further, the first-stage filtering membrane is provided with a circulating pump; the second-stage high-pressure pump is a vertical centrifugal pump; the third-stage high-pressure pump is a vertical centrifugal pump; the four-stage high-pressure pump adopts a three-plunger high-pressure pump; the five-stage high-pressure pump adopts a three-plunger high-pressure pump.
A biogas slurry concentration method comprises the following steps:
firstly, conveying biogas slurry in an original biogas slurry tank to an adjusting tank by using an original conveying pump, removing fine gravel and insoluble substances in the biogas slurry after adjustment and precipitation in the adjusting tank, and further filtering impurities by using a fine grid;
conveying the filtered biogas slurry to a primary raw water tank by using an adjusting conveying pump, and then enabling the biogas slurry to enter a primary filtering membrane through a primary conveying pump and a primary precision filter, wherein the primary filtering membrane comprises a ceramic membrane, a metal membrane or a tubular ultrafiltration membrane, the pore diameter is 30-200nm, the primary filtering membrane filters the biogas slurry in a continuous filtering mode, the membrane flux is 30-60L/square meter, h, the operating pressure is 0.1-0.3MPa, the permeate liquid enters a secondary raw water tank, the retentate liquid flows back to the primary raw water tank, and the biogas slurry in the primary raw water tank is concentrated to one N times in volume and then conveyed to a concentrated water tank, so that the flush fertilizer concentrated by N times is obtained;
and step three, enabling the permeation liquid in the second-stage raw water tank to enter a second-stage material membrane separation device through a second-stage delivery pump, a second-stage precision filter and a second-stage high-pressure pump, wherein the second-stage material membrane separation device is a roll type ultrafiltration membrane, the filtration molecular weight of the roll type ultrafiltration membrane is 1000-3000D, humic acid and macromolecular organic matters can be intercepted, the membrane flux is 20-30L per square meter, h is, the operating pressure is 0.3-0.7MPa, and the permeation liquid flow rate is as follows during operation: retentate flow = X:1, enabling permeate to enter a three-stage raw water tank, and enabling trapped liquid to enter a four-stage raw water tank;
and step four, the permeation liquid in the three-level raw water tank enters three-level material membrane separation equipment through a three-level delivery pump, a three-level precision filter and a three-level high-pressure pump, the three-level material membrane separation equipment is a rolled nanofiltration membrane, the filtration molecular weight of the rolled nanofiltration membrane is 100-300D, small molecular organic matters can be intercepted, the membrane flux is 15-25L/square meter.h, the operating pressure is 0.6-1.4MPa, and the permeation liquid flow rate during operation is as follows: retentate flow = Y:1, permeate enters a six-stage raw water tank, trapped fluid enters a five-stage raw water tank, the trapped fluid in the five-stage raw water tank enters five-stage high-pressure material membrane separation equipment through a five-stage delivery pump, a five-stage precision filter and a five-stage high-pressure pump, and the five-stage high-pressure material membrane separation equipment isDisk tube type reverse osmosis membrane having NaCl rejection>98.5 percent, filtering by adopting a continuous filtering mode, wherein the membrane flux is 10-20L/square meter, h, the operating pressure is 5-7MPa, the permeate enters a six-stage raw water tank, the trapped fluid flows back to a five-stage raw water tank, the volume in the five-stage raw water tank is concentrated to one P, small molecular organic matters in the biogas slurry are concentrated by (Y + 1) P times, and then the foliar fertilizer of the concentrated biogas slurry (Y + 1) P times can be prepared; the trapped fluid in the four-stage raw water tank enters four-stage high-pressure material membrane separation equipment through a four-stage delivery pump, a four-stage precise filter and a four-stage high-pressure pump, the four-stage high-pressure material membrane separation equipment is a disc-tube type nanofiltration membrane, and the MgSO (MgSO) of the disc-tube type nanofiltration membrane 4 Rejection rate>97 percent, filtering by adopting a disc-tube type nanofiltration membrane in a continuous filtering mode, wherein the membrane flux is 15-25L/square meter.h, the operating pressure is 3-5MPa, the permeation liquid enters a six-stage raw water tank, the trapped liquid reflows to a four-stage raw water tank, the volume in the four-stage raw water tank is concentrated to one M, humic acid and macromolecular organic matters in the biogas slurry are concentrated by (X + 1) M times, and then, the humic acid chemical fertilizer with concentrated biogas slurry of (X + 1) M times can be obtained by blending;
step five, the permeate liquid in the six-stage raw water tank enters six-stage material membrane separation equipment through a six-stage delivery pump and a six-stage precision filter, and the non-volatile acid solution enters the six-stage material membrane separation equipment from the non-volatile acid solution storage equipment through an acid delivery pump and an acid precision filter; the six-stage material membrane separation equipment main body is an ammonia nitrogen absorber, the ammonia nitrogen absorber comprises a degassing membrane, the flow rate of a single membrane of the degassing membrane is 0.4-0.6t/h, the operating pressure is 0.2-0.3MPa, a permeate liquid reacts with a nonvolatile acid solution in a membrane column to deaminate, the water produced after deamination reaches the standard and is discharged, and the formed ammonium salt flows back to a nonvolatile acid solution storage device to further collect the ammonium salt.
Furthermore, COD of the biogas slurry filtered in the first step is less than or equal to 10000mg/L, ammonia nitrogen is less than or equal to 2000mg/L, and the conductivity is less than or equal to 20000 mu S/cm.
Further, the non-volatile acid solution in the fifth step comprises a phosphoric acid solution or a sulfuric acid solution, and the final ammonia nitrogen absorption amount of the 10wt% phosphoric acid solution or the 10wt% sulfuric acid solution can reach 25-35 times of the ammonia nitrogen concentration in the biogas slurry treated by the adjusting tank and the fine grid in unit volume.
Furthermore, the aperture of the fine grid is 5-10mm; the aperture of the primary precision filter is 0.8-2mm, and the material comprises stainless steel; the aperture of the secondary precision filter is 1-10um, and the material comprises PP material; the aperture of the three-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the four-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the five-stage precision filter is 1-10um, and the material comprises PP material; the aperture of the six-stage precision filter is 1-10um, and the material comprises a PP material.
Further, the first-stage filtering membrane is provided with a circulating pump; the second-stage high-pressure pump is a vertical centrifugal pump; the third-stage high-pressure pump is a vertical centrifugal pump; the four-stage high-pressure pump adopts a three-plunger high-pressure pump; the five-stage high-pressure pump adopts a three-plunger high-pressure pump.
The invention has the beneficial effects that:
1. the invention realizes the grading and high-power concentration of the effective components in the biogas slurry and the complete extraction of ammonium ions in the biogas slurry. The nutrient components in the biogas slurry are mainly divided into three parts: (1) The high-concentration macromolecular humic acid and macromolecular organic matter can be mixed to extract humic acid fertilizer; (2) The high-concentration micromolecular organic matter can be mixed and extracted to prepare foliar fertilizer; (3) The high-content ammonium salt solution is recovered, ammonium salts such as ammonium phosphate or ammonium sulfate can be prepared and extracted, and the ammonium phosphate can be compounded with the high-concentration macromolecular humic acid and the macromolecular organic matter or the high-concentration micromolecular organic matter to prepare nitrogen and phosphorus fertilizers, so that the practical value and the economic benefit are high; the ammonium sulfate salt can be further recycled, thereby generating economic benefit.
2. According to the invention, humic acid and macromolecular organic matters in the biogas slurry are intercepted by a roll-type ultrafiltration membrane, and micromolecular organic matters are intercepted by a roll-type nanofiltration membrane, so that the active ingredients in the biogas slurry are finally separated; and then, the coiled ultrafiltration membrane trapped fluid and the coiled nanofiltration membrane trapped fluid are concentrated again by adopting the disk tube type nanofiltration membrane DTNF and the disk tube type reverse osmosis membrane DTRO, so that the concentration multiple is higher, and the development and utilization values are higher. The DTNF and DTRO belong to wide flow channel membranes, the flow channel width is multiple times of that of similar common roll-type membranes, the membranes are not easy to block and scale, the pollution resistance is higher, the service life is longer, the operation pressure of the DTNF and DTRO can reach 70-80bar, the operation pressure of the common roll-type NF and DTRO can only reach 30-40bar, the higher the operation pressure is, the higher the concentration multiple is. The DTNF and the DTRO normally run under higher pressure, so that the concentration multiple is higher. The invention realizes the separation and concentration of humic acid, macromolecular organic matters and micromolecular organic matters in the biogas slurry, and the high-efficiency utilization of the humic acid, the macromolecular organic matters and the micromolecular organic matters.
3. The invention adopts an ammonia nitrogen absorber such as a degassing membrane, so that deamination and ammonia absorption can be completed simultaneously, and high-concentration ammonium salt solution can be obtained and can be recycled; ammonium ions in the discharged water tend to 0 and can be discharged after reaching the standard, so that the problem that the produced water can be discharged after reaching the standard only by an evaporator finally required by other processes is reduced, and the initial investment and the operation cost are reduced; deamination and ammonia absorption are integrated, so that the occupied space is saved.
4. The biogas slurry has high concentration multiple of effective components, increases the effective components in unit volume, improves the utilization efficiency, and is favorable for transportation and sale.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings. The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
A biogas slurry concentration system is shown in figure 1 and comprises an original biogas slurry pool, an original delivery pump, an adjusting pool, a fine grid, an adjusting delivery pump, a primary raw water tank, a concentrated water pool, a primary delivery pump, a primary precision filter, a primary filtering membrane, a secondary raw water tank, a secondary delivery pump, a secondary precision filter, a secondary high-pressure pump, a secondary material membrane separation device, a tertiary raw water tank, a tertiary delivery pump, a tertiary precision filter, a tertiary high-pressure pump, a tertiary material membrane separation device, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quaternary high-pressure pump, a quaternary high-pressure material membrane separation device, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a five-grade precision filter, a quaternary high-pressure pump, a quaternary high-pressure material membrane separation device, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quaternary high-pressure material membrane separation device, an acid delivery pump, an acid solution storage device,
the first-stage filtering membrane comprises a ceramic membrane, a metal membrane or a tubular ultrafiltration membrane, and the aperture is 30-200nm; the primary filtering membrane is provided with the circulating pump, so that the circulating flow of the material liquid is increased, the flow velocity of the material liquid is accelerated, the surface flow velocity of the membrane is accelerated, the concentration polarization phenomenon is reduced, the fouling and blockage of the membrane are avoided, and the service life of the membrane is prolonged; the second-level material membrane separation equipment is a roll-type ultrafiltration membrane, the filtration molecular weight of the roll-type ultrafiltration membrane is 1000-3000D, and humic acid and macromolecular organic matters can be intercepted; the third-level material membrane separation equipment is a rolled nanofiltration membrane, the filtration molecular weight of the rolled nanofiltration membrane is 100-300D, and small molecular organic matters can be intercepted; the four-stage high-pressure material membrane separation equipment is a disc-tube type nanofiltration membrane, and MgSO (MgSO) of the disc-tube type nanofiltration membrane 4 Rejection rate>97 percent; the five-stage high-pressure material membrane separation equipment is a disc tubular reverse osmosis membrane, and the NaCl rejection rate of the disc tubular reverse osmosis membrane>98.5 percent; the six-stage material membrane separation equipment main body is an ammonia nitrogen absorber, such as a degassing membrane, and the degassing membrane replaces the multi-effect evaporation of the original process, so that the investment and the operation cost are reduced, and the occupied area is saved; the non-volatile acid solution storage device comprises a phosphoric acid solution storage device or a sulfuric acid solution storage device;
the aperture of the fine grid is 5-10mm; the aperture of the primary precision filter is 0.8-2mm, and the material comprises stainless steel; the aperture of the secondary precision filter is 1-10um, and the material comprises PP material; the aperture of the three-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the four-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the five-stage precision filter is 1-10um, and the material comprises PP material; the aperture of the six-stage precision filter is 1-10um, and the material comprises PP material;
the second-stage high-pressure pump is a vertical centrifugal pump; the third-stage high-pressure pump is a vertical centrifugal pump; the four-stage high-pressure pump adopts a three-plunger high-pressure pump; the fifth-stage high-pressure pump adopts a three-plunger high-pressure pump; the three-plunger high-pressure pump has the advantages of high volumetric efficiency, small leakage and the like, can work under high pressure, and can provide higher membrane feeding pressure for a system;
the raw biogas slurry tank is connected with an adjusting tank through a raw conveying pump, a fine grid is arranged behind the adjusting tank, and the fine grid is connected with a primary raw water tank through an adjusting conveying pump; the concentrated water outlet of the primary raw water tank is connected with the concentrated water tank, the primary raw water tank is connected with the primary filtering membrane through a primary delivery pump and a primary precision filter, the intercepted liquid outlet of the primary filtering membrane is connected with the primary raw water tank, and the permeated liquid outlet of the primary filtering membrane is connected with the secondary raw water tank;
the second-stage raw water tank is connected with second-stage material membrane separation equipment through a second-stage delivery pump, a second-stage precision filter and a second-stage high-pressure pump, a trapped liquid outlet of the second-stage material membrane separation equipment is connected with the fourth-stage raw water tank, and a permeate outlet of the second-stage material membrane separation equipment is connected with the third-stage raw water tank;
the four-stage raw water tank is connected with four-stage high-pressure material membrane separation equipment through a four-stage delivery pump, a four-stage precision filter and a four-stage high-pressure pump, and a trapped liquid outlet of the four-stage high-pressure material membrane separation equipment is connected with the four-stage raw water tank;
the three-stage raw water tank is connected with three-stage material membrane separation equipment through a three-stage delivery pump, a three-stage precision filter and a three-stage high-pressure pump, and a trapped fluid outlet of the three-stage material membrane separation equipment is connected with the five-stage raw water tank;
the five-stage raw water tank is connected with the five-stage high-pressure material membrane separation equipment through a five-stage delivery pump, a five-stage precision filter, a five-stage high-pressure pump, the trapped fluid outlet of the five-stage high-pressure material membrane separation equipment is connected with the five-stage raw water tank,
a permeate liquid outlet of the four-stage high-pressure material membrane separation equipment, a permeate liquid outlet of the three-stage material membrane separation equipment and a permeate liquid outlet of the five-stage high-pressure material membrane separation equipment are connected to a six-stage raw water tank;
the six-stage raw water tank is connected with the six-stage material membrane separation equipment through the six-stage delivery pump and the six-stage precision filter, the non-volatile acid solution storage equipment is connected with the non-volatile acid solution inlet of the six-stage material membrane separation equipment through the acid delivery pump and the acid precision filter, and the ammonium salt outlet of the six-stage material membrane separation equipment is connected with the non-volatile acid solution storage equipment.
A biogas slurry concentration method comprises the following steps:
firstly, conveying biogas slurry in a primary biogas slurry pool to an adjusting pool by using a primary conveying pump, removing fine gravel and insoluble substances in the biogas slurry after adjustment and precipitation in the adjusting pool, and further filtering impurities by using a fine grating with the aperture of 5-10mm; COD (chemical oxygen demand) of the biogas slurry filtered in the first step is less than or equal to 10000mg/L, ammonia nitrogen is less than or equal to 2000mg/L, and conductivity is less than or equal to 20000 mu S/cm, so that the biogas slurry is easier to separate solid from liquid in a subsequent membrane treatment system;
conveying the filtered biogas slurry to a primary raw water tank by using an adjusting conveying pump, then entering a primary filtering membrane through a primary conveying pump and a primary precision filter, wherein the aperture of the primary precision filter is 0.8-2mm, the material comprises stainless steel, the primary filtering membrane comprises a ceramic membrane, a metal membrane or a tubular ultrafiltration membrane, the aperture is 30-200nm, the primary filtering membrane filters the biogas slurry in a continuous filtering mode, the membrane flux is 30-60L/square meter h, the operating pressure is 0.1-0.3MPa, the primary filtering membrane is provided with a circulating pump, the permeating liquid enters a secondary raw water tank, the intercepting liquid flows back to the primary raw water tank, the biogas slurry in the primary raw water tank is concentrated to one tenth in volume and then conveyed to a concentrated water tank, and thus ten times of concentrated flush fertilizer is obtained;
step three, the permeate liquid in the second-stage raw water tank enters a second-stage material membrane separation device through a second-stage delivery pump, a second-stage precision filter and a second-stage high-pressure pump, the aperture of the second-stage precision filter is 1-10 mu m, the materials comprise PP materials, the second-stage high-pressure pump is a vertical centrifugal pump, the second-stage material membrane separation device is a roll type ultrafiltration membrane, the filtration molecular weight of the roll type ultrafiltration membrane is 1000-3000D, humic acid and macromolecular organic matters can be intercepted, the membrane flux is 20-30L/square meter.h, the operating pressure is 0.3-0.7MPa, and when the membrane is operated, the permeate liquid flow is as follows: retentate flow =9:1, enabling permeate to enter a three-stage raw water tank, and enabling trapped liquid to enter a four-stage raw water tank;
and step four, enabling permeate liquid in the third-level raw water tank to enter third-level material membrane separation equipment through a third-level delivery pump, a third-level precision filter and a third-level high-pressure pump, wherein the aperture of the third-level precision filter is 1-10 mu m, the material comprises PP (polypropylene), the third-level high-pressure pump is a vertical centrifugal pump, the third-level material membrane separation equipment is a rolled nanofiltration membrane, the filtration molecular weight of the rolled nanofiltration membrane is 100-300D, small-molecule organic matters can be intercepted, the membrane flux is 15-25L/square meter.h, the operating pressure is 0.6-1.4MPa, and when the membrane is operated, the permeate liquid flow is as follows: retentate flow =9:1, permeate liquidEntering a six-stage raw water tank, wherein intercepted liquid enters a five-stage raw water tank, the intercepted liquid in the five-stage raw water tank enters five-stage high-pressure material membrane separation equipment through a five-stage delivery pump, a five-stage precision filter and a five-stage high-pressure pump, the aperture of the five-stage precision filter is 1-10 mu m, the material comprises a PP material, the five-stage high-pressure pump adopts a three-plunger high-pressure pump, the five-stage high-pressure material membrane separation equipment is a disc tube type reverse osmosis membrane, and the NaCl interception rate of the disc tube type reverse osmosis membrane>98.5 percent, filtering by adopting a continuous filtering mode, wherein the membrane flux is 10-20L/square meter, h and the operating pressure is 5-7MPa, the permeating liquid enters a six-grade raw water tank, the trapped liquid flows back to a five-grade raw water tank, the volume of the five-grade raw water tank is concentrated to one third, small molecular organic matters in the biogas slurry are concentrated by 30 times, and then the foliar fertilizer concentrated by 30 times of the biogas slurry can be obtained by blending; trapped fluid in the four-stage raw water tank enters four-stage high-pressure material membrane separation equipment through a four-stage delivery pump, a four-stage precision filter and a four-stage high-pressure pump, the aperture of the four-stage precision filter is 1-10 mu m, the material comprises a PP (polypropylene) material, the four-stage high-pressure pump adopts a three-plunger high-pressure pump, the four-stage high-pressure material membrane separation equipment is a disc-tube nanofiltration membrane, and MgSO (MgSO) of the disc-tube nanofiltration membrane 4 Retention rate>97 percent, filtering by a disc-tube type nanofiltration membrane in a continuous filtering mode, wherein the membrane flux is 15-25L/square meter, the operating pressure is 3-5MPa, the permeating liquid enters a six-stage raw water tank, the trapped liquid flows back to a four-stage raw water tank, the volume in the four-stage raw water tank is concentrated to one third, the humic acid and macromolecular organic matters in the biogas slurry are concentrated by 30 times, and then the humic acid fertilizer with the concentrated biogas slurry of 30 times can be obtained by blending;
step five, the permeate liquid in the six-stage raw water tank enters six-stage material membrane separation equipment through a six-stage delivery pump and a six-stage precision filter, and the non-volatile acid solution comprises a phosphoric acid solution or a sulfuric acid solution enters the six-stage material membrane separation equipment from non-volatile acid solution storage equipment through an acid delivery pump and an acid precision filter; the pore diameter of the six-stage precision filter is 1-10 mu m, the material comprises PP material, the main body of the six-stage material membrane separation equipment is an ammonia nitrogen absorber, such as a degassing membrane, the flow rate of a single membrane of the degassing membrane is 0.4-0.6t/h, the operating pressure is 0.2-0.3MPa, a permeate liquid reacts with a nonvolatile acid solution in a membrane column to deaminate, water produced after deamination is discharged after reaching the standard, and formed ammonium salt flows back to the nonvolatile acid solution storage equipment to further collect the ammonium salt. The final ammonia nitrogen absorption amount of the 10wt% phosphoric acid solution or the 10wt% sulfuric acid solution can reach 25-35 times of the ammonia nitrogen concentration in the biogas slurry treated by the adjusting tank and the fine grid in unit volume.
Claims (10)
1. A biogas slurry concentration system is characterized by comprising an original biogas slurry pool, an original delivery pump, an adjusting pool, a fine grid, an adjusting delivery pump, a primary raw water tank, a concentrated water tank, a primary delivery pump, a primary precision filter, a primary filtering membrane, a secondary raw water tank, a secondary delivery pump, a secondary precision filter, a secondary high-pressure pump, secondary material membrane separation equipment, a tertiary raw water tank, a tertiary delivery pump, a tertiary precision filter, a tertiary high-pressure pump, tertiary material membrane separation equipment, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quaternary high-pressure pump, quaternary high-pressure material membrane separation equipment, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a fifth high-pressure pump, a quaternary high-pressure material membrane separation equipment, a quaternary raw water tank, a quaternary delivery pump, a quaternary precision filter, a quaternary high-pressure material membrane separation equipment, an acid delivery pump, an acid precision filter and non-volatile storage equipment,
the first-stage filtering membrane comprises a ceramic membrane, a metal membrane or a tubular ultrafiltration membrane, and the aperture is 30-200nm; the second-level material membrane separation equipment is a roll-type ultrafiltration membrane, the filtration molecular weight of the roll-type ultrafiltration membrane is 1000-3000D, and humic acid and macromolecular organic matters can be intercepted; the three-stage material membrane separation equipment is a rolled nanofiltration membrane, the filtration molecular weight of the rolled nanofiltration membrane is 100-300D, and small molecular organic matters can be intercepted; the four-stage high-pressure material membrane separation equipment is a disc-tube type nanofiltration membrane, and MgSO (MgSO) of the disc-tube type nanofiltration membrane 4 Retention rate>97 percent; the five-stage high-pressure material membrane separation equipment is a disc-tube type reverse osmosis membrane, and the NaCl rejection rate of the disc-tube type reverse osmosis membrane>98.5 percent; the six-stage material membrane separation equipment main body is an ammonia nitrogen absorber;
the raw biogas slurry tank is connected with an adjusting tank through a raw conveying pump, a fine grid is arranged behind the adjusting tank, and the fine grid is connected with a primary raw water tank through an adjusting conveying pump; the concentrated water outlet of the primary raw water tank is connected with the concentrated water tank, the primary raw water tank is connected with the primary filtering membrane through a primary delivery pump and a primary precision filter, the intercepted liquid outlet of the primary filtering membrane is connected with the primary raw water tank, and the permeated liquid outlet of the primary filtering membrane is connected with the secondary raw water tank;
the second-stage raw water tank is connected with a second-stage material membrane separation device through a second-stage delivery pump, a second-stage precision filter and a second-stage high-pressure pump, a trapped liquid outlet of the second-stage material membrane separation device is connected with the fourth-stage raw water tank, and a permeate liquid outlet of the second-stage material membrane separation device is connected with the third-stage raw water tank;
the four-stage raw water tank is connected with four-stage high-pressure material membrane separation equipment through a four-stage delivery pump, a four-stage precision filter and a four-stage high-pressure pump, and a trapped liquid outlet of the four-stage high-pressure material membrane separation equipment is connected with the four-stage raw water tank;
the three-stage raw water tank is connected with three-stage material membrane separation equipment through a three-stage delivery pump, a three-stage precision filter and a three-stage high-pressure pump, and a trapped fluid outlet of the three-stage material membrane separation equipment is connected with the five-stage raw water tank;
the five-stage raw water tank is connected with the five-stage high-pressure material membrane separation equipment through a five-stage delivery pump, a five-stage precision filter, a five-stage high-pressure pump, a trapped liquid outlet of the five-stage high-pressure material membrane separation equipment is connected with the five-stage raw water tank,
a permeate liquid outlet of the four-stage high-pressure material membrane separation equipment, a permeate liquid outlet of the three-stage material membrane separation equipment and a permeate liquid outlet of the five-stage high-pressure material membrane separation equipment are connected to a six-stage raw water tank;
the six-stage raw water tank is connected with the six-stage material membrane separation equipment through the six-stage delivery pump and the six-stage precision filter, the non-volatile acid solution storage equipment is connected with the non-volatile acid solution inlet of the six-stage material membrane separation equipment through the acid delivery pump and the acid precision filter, and the ammonium salt outlet of the six-stage material membrane separation equipment is connected with the non-volatile acid solution storage equipment.
2. The biogas slurry concentration system of claim 1, wherein the ammonia nitrogen absorber comprises a degassing membrane.
3. The biogas slurry concentration system according to claim 1, wherein the non-volatile acid solution storage device comprises a phosphoric acid solution storage device or a sulfuric acid solution storage device.
4. The biogas slurry concentration system according to claim 1, wherein the fine grid has a pore size of 5-10mm; the aperture of the primary precision filter is 0.8-2mm, and the material comprises stainless steel; the aperture of the secondary precision filter is 1-10um, and the material comprises PP material; the aperture of the three-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the four-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the five-stage precision filter is 1-10um, and the material comprises PP material; six grades of precision filter aperture 1-10um, the material includes the PP material.
5. The biogas slurry concentration system according to claim 1, wherein the primary filtration membrane is provided with a circulation pump; the second-stage high-pressure pump is a vertical centrifugal pump; the third-stage high-pressure pump is a vertical centrifugal pump; the four-stage high-pressure pump adopts a three-plunger high-pressure pump; the five-stage high-pressure pump adopts a three-plunger high-pressure pump.
6. A biogas slurry concentration method is characterized by comprising the following steps:
firstly, conveying biogas slurry in a raw biogas slurry pool to an adjusting pool by using a raw conveying pump, removing fine gravel and insoluble substances in the biogas slurry after the biogas slurry is adjusted and precipitated by the adjusting pool, and further filtering impurities by using a fine grid;
conveying the filtered biogas slurry to a primary raw water tank by using an adjusting conveying pump, and then enabling the biogas slurry to enter a primary filtering membrane through a primary conveying pump and a primary precision filter, wherein the primary filtering membrane comprises a ceramic membrane, a metal membrane or a tubular ultrafiltration membrane, the pore diameter is 30-200nm, the primary filtering membrane filters the biogas slurry in a continuous filtering mode, the membrane flux is 30-60L/square meter, h, the operating pressure is 0.1-0.3MPa, the permeate liquid enters a secondary raw water tank, the retentate liquid flows back to the primary raw water tank, and the biogas slurry in the primary raw water tank is concentrated to one N times in volume and then conveyed to a concentrated water tank, so that the flush fertilizer concentrated by N times is obtained;
step three, the permeate liquid in the secondary raw water tank enters secondary material membrane separation equipment through a secondary delivery pump, a secondary precision filter and a secondary high-pressure pump, the secondary material membrane separation equipment is a roll-type ultrafiltration membrane, the filtration molecular weight of the roll-type ultrafiltration membrane is 1000-3000D, humic acid and macromolecular organic matters can be intercepted, the membrane flux is 20-30L/square meter, h, the operating pressure is 0.3-0.7MPa, and the permeate liquid flow during operation is as follows: retentate flow = X:1, enabling permeate to enter a three-stage raw water tank, and enabling trapped liquid to enter a four-stage raw water tank;
and step four, the permeation liquid in the three-level raw water tank enters three-level material membrane separation equipment through a three-level delivery pump, a three-level precision filter and a three-level high-pressure pump, the three-level material membrane separation equipment is a rolled nanofiltration membrane, the filtration molecular weight of the rolled nanofiltration membrane is 100-300D, small molecular organic matters can be intercepted, the membrane flux is 15-25L/square meter.h, the operating pressure is 0.6-1.4MPa, and the permeation liquid flow rate during operation is as follows: trapped fluid flow = Y:1, permeate enters a six-stage raw water tank, trapped fluid enters a five-stage raw water tank, the trapped fluid in the five-stage raw water tank enters five-stage high-pressure material membrane separation equipment through a five-stage delivery pump, a five-stage precision filter and a five-stage high-pressure pump, the five-stage high-pressure material membrane separation equipment is a disc-tube type reverse osmosis membrane, and the NaCl rejection rate of the disc-tube type reverse osmosis membrane>98.5%, filtering by adopting a continuous filtering mode, wherein the membrane flux is 10-20L/square meter for h, the operating pressure is 5-7MPa, the permeate liquid enters a six-stage raw water tank, the trapped liquid reflows to a five-stage raw water tank, the volume in the five-stage raw water tank is concentrated to one P, small molecular organic matters in the biogas slurry are concentrated by (Y + 1) P times, and then the blending can be carried out to obtain the foliar fertilizer of the concentrated biogas slurry (Y + 1) P times; the trapped fluid in the four-stage raw water tank enters four-stage high-pressure material membrane separation equipment through a four-stage delivery pump, a four-stage precise filter and a four-stage high-pressure pump, the four-stage high-pressure material membrane separation equipment is a disc-tube type nanofiltration membrane, and the MgSO (MgSO) of the disc-tube type nanofiltration membrane 4 Retention rate>97 percent, filtering by adopting a disc-tube type nanofiltration membrane in a continuous filtering mode, wherein the membrane flux is 15-25L/square meter.h, the operating pressure is 3-5MPa, the permeation liquid enters a six-stage raw water tank, the trapped liquid reflows to a four-stage raw water tank, the volume in the four-stage raw water tank is concentrated to one M, humic acid and macromolecular organic matters in the biogas slurry are concentrated by (X + 1) M times, and then, the humic acid chemical fertilizer with concentrated biogas slurry of (X + 1) M times can be obtained by blending;
step five, the permeate liquid in the six-stage raw water tank enters six-stage material membrane separation equipment through a six-stage delivery pump and a six-stage precision filter, and the non-volatile acid solution enters the six-stage material membrane separation equipment from the non-volatile acid solution storage equipment through an acid delivery pump and an acid precision filter; the six-stage material membrane separation equipment main body is an ammonia nitrogen absorber, the ammonia nitrogen absorber comprises a degassing membrane, the flow rate of a single membrane of the degassing membrane is 0.4-0.6t/h, the operating pressure is 0.2-0.3MPa, a permeate liquid reacts with a nonvolatile acid solution in a membrane column to deaminate, the water produced after deamination reaches the standard and is discharged, and the formed ammonium salt flows back to a nonvolatile acid solution storage device to further collect the ammonium salt.
7. The biogas slurry concentration method according to claim 6, wherein COD of the biogas slurry filtered in the first step is less than or equal to 10000mg/L, ammonia nitrogen is less than or equal to 2000mg/L, and conductivity is less than or equal to 20000 μ S/cm.
8. The biogas slurry concentration method according to claim 6, wherein the non-volatile acid solution in the fifth step comprises a phosphoric acid solution or a sulfuric acid solution, and the amount of ammonia nitrogen finally absorbed by the 10wt% phosphoric acid solution or the 10wt% sulfuric acid solution is 25-35 times of the ammonia nitrogen concentration in the biogas slurry treated by the adjusting tank and the fine grid in unit volume.
9. The biogas slurry concentration method according to claim 6, wherein the aperture of the fine grid is 5-10mm; the aperture of the primary precision filter is 0.8-2mm, and the material comprises stainless steel; the aperture of the secondary precision filter is 1-10um, and the material comprises PP material; the aperture of the three-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the four-stage precise filter is 1-10um, and the material comprises PP material; the aperture of the five-stage precision filter is 1-10um, and the material comprises PP material; the aperture of the six-stage precision filter is 1-10um, and the material comprises a PP material.
10. The biogas slurry concentration method according to claim 6, wherein the primary filtration membrane is provided with a circulation pump; the second-stage high-pressure pump is a vertical centrifugal pump; the three-stage high-pressure pump is a vertical centrifugal pump; the four-stage high-pressure pump adopts a three-plunger high-pressure pump; the five-stage high-pressure pump adopts a three-plunger high-pressure pump.
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