CN115057562B - Biogas slurry drip irrigation pretreatment technology and application thereof - Google Patents
Biogas slurry drip irrigation pretreatment technology and application thereof Download PDFInfo
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- CN115057562B CN115057562B CN202210676444.1A CN202210676444A CN115057562B CN 115057562 B CN115057562 B CN 115057562B CN 202210676444 A CN202210676444 A CN 202210676444A CN 115057562 B CN115057562 B CN 115057562B
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- 239000002002 slurry Substances 0.000 title claims abstract description 212
- 238000003973 irrigation Methods 0.000 title claims abstract description 54
- 230000002262 irrigation Effects 0.000 title claims abstract description 54
- 238000005516 engineering process Methods 0.000 title claims abstract description 18
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 88
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000008878 coupling Effects 0.000 claims abstract description 19
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 4
- 239000002253 acid Substances 0.000 claims description 73
- 238000005192 partition Methods 0.000 claims description 39
- 238000002360 preparation method Methods 0.000 claims description 31
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 25
- 238000005273 aeration Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 238000010979 pH adjustment Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/16—Control of watering
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Environmental Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a biogas slurry drip irrigation flow type pretreatment technology, which comprises a biogas slurry supply main pipeline, wherein the front end of the biogas slurry supply main pipeline is fixedly communicated with a biogas slurry storage pool, a supply pump and a supply electromagnetic valve are sequentially arranged along the biogas slurry flow direction of the biogas slurry supply main pipeline, the rear end of the biogas slurry supply main pipeline is fixedly connected with a pH adjusting part, the pH adjusting part is fixedly connected with one end of a biogas slurry conveying main pipeline, the biogas slurry conveying main pipeline is sequentially provided with a hydrogen peroxide treatment part, an ultraviolet ray and ozone coupling treatment part and a water outlet part along the biogas slurry flow direction, the hydrogen peroxide treatment part is connected in parallel with the biogas slurry conveying main pipeline, the water inlet of the ultraviolet ray and ozone coupling treatment part is fixedly communicated with two sides of the biogas slurry conveying main pipeline through a cross, the water outlet part is fixedly communicated with the other water outlet of the cross, and an irrigation electromagnetic valve and an irrigation pump are sequentially arranged along the biogas slurry flow direction, so that the pretreatment efficiency of biogas slurry in a field is greatly improved.
Description
Technical Field
The invention relates to the technical field of biogas slurry drip irrigation, in particular to a biogas slurry drip irrigation pretreatment technology and application thereof.
Background
Biogas slurry is a high-efficiency organic liquid fertilizer, the integration of biogas slurry, water and fertilizer is an important technical means for solving the problem of returning and utilizing biogas slurry by means of a biogas slurry drip irrigation technology, and the key for ensuring the stable and high-efficiency operation of a drip irrigation system is to adopt a pretreatment technology before the biogas slurry enters the drip irrigation system. Pretreatment measures such as flocculation, sedimentation and filtration are common technical means for treating sewage at present, but part of nutrient substances in the biogas slurry can be lost in the flocculation treatment, and the sedimentation and filtration treatment period is too long, so that the measures are not beneficial to the efficient returning treatment of the biogas slurry. The acidification treatment of the biogas slurry is beneficial to maintaining the nutrient components in the biogas slurry, and the oxidation technology has the advantages of high treatment efficiency, no secondary pollution and the like in the aspect of water treatment, so that the reasonable oxidation treatment mode and treatment parameters selected under the acidic condition of the biogas slurry have important significance for improving the pretreatment effect of the biogas slurry.
In the prior art, patent number 202011046850.7 discloses a modular filter for pretreating biogas slurry after anaerobic fermentation in livestock and poultry breeding, and provides a solution for constructing a modular filter by using chaff and straws as filter materials and 1-n filter blocks, but considering that the existing biogas slurry residue is excessive, the natural filtration mode cannot meet the actual requirement of efficient biogas slurry returning.
In addition, the existing biogas slurry pretreatment measures have the defect that the filling is carried out by means of an external acid liquid tank and an external acid liquid pump during the pH adjustment period, but the acid liquid tank is communicated with the biogas slurry barrel through a pipeline, so that the filling stop time is the time when a pH meter in the acid liquid tank displays a target value, but a certain amount of acid liquid always remains in an acid liquid filling pipeline at the time, the subsequent result is inaccurate, and even the direct backflow of the strong acid liquid can cause the damage of a next-stage treatment device.
Therefore, a flowing biogas slurry pretreatment measure is urgently needed to be provided so as to ensure efficient biogas slurry returning and safe and long-term operation of a biogas slurry drip irrigation system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a biogas slurry drip irrigation pretreatment technology and application thereof from the aspects of biogas slurry nutrient retention and oxidation efficient treatment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a biogas slurry drip irrigation flow type pretreatment technology comprises a biogas slurry supply main pipeline, wherein the front end of the main pipeline is fixedly communicated with a biogas slurry storage pool, a supply pump and a supply electromagnetic valve are sequentially arranged in the flow direction of biogas slurry, the rear end of the biogas slurry supply main pipeline is fixedly connected with a pH adjusting part, the pH adjusting part is fixedly connected with one end of a biogas slurry conveying main pipeline, the biogas slurry conveying main pipeline is sequentially provided with a hydrogen peroxide treatment part, an ultraviolet ray and ozone coupling treatment part and a water outlet part in the flow direction of biogas slurry, the hydrogen peroxide treatment part is connected in parallel with the biogas slurry conveying main pipeline, the water inlet of the ultraviolet ray and ozone coupling treatment part is fixedly communicated with two sides of the biogas slurry conveying main pipeline through a cross, the water outlet part is fixedly communicated with the other water outlet of the cross, and an irrigation electromagnetic valve and an irrigation pump are sequentially arranged in the flow direction of biogas slurry;
the pH adjusting part comprises a biogas slurry circulating system, the biogas slurry circulating system comprises a biogas slurry preparation barrel, a biogas slurry vent hole is fixedly arranged at the top of the biogas slurry preparation barrel, a central control device is fixedly arranged on the side surface of the biogas slurry preparation barrel, a liquid level monitor and a pH monitor are respectively arranged at the top and the bottom of the side of the biogas slurry preparation barrel, a water inlet and a water outlet of the biogas slurry preparation barrel are respectively and fixedly communicated with the tail end of a biogas slurry supply main pipeline and the front end of a biogas slurry conveying main pipeline, the biogas slurry conveying main pipeline is sequentially provided with a conveying electromagnetic valve, a conveying pump and a return pipe along the flow direction of biogas slurry, a water inlet end of the return pipe (408) is fixedly connected to the biogas slurry conveying main pipeline through a tee joint, a water outlet end of the biogas slurry preparation barrel is fixedly connected to a return port of the biogas slurry preparation barrel, a return electromagnetic valve is fixedly arranged on the return pipe, an acid adding device is arranged between the conveying pump and the return pipe, the acid adding device comprises an acid adding barrel, an acid adding vent hole is arranged at the top of the acid adding barrel, the water outlet is fixedly connected to the main pipeline, the tail end of the acid adding pipeline is fixedly connected to the biogas slurry conveying main pipeline through a tee joint, and an acid adding electromagnetic valve and an acid adding pump are sequentially arranged along the flow direction of the acid adding device;
the whole height of the pH adjusting part is slightly higher than that of the hydrogen peroxide treatment part, an annular partition plate is arranged at the bottom inside the barrel body of the biogas slurry preparation barrel, the height of the partition plate inside the barrel body can be electrically controlled to lift, a through hole is formed in a partition plate body, a through hole switch in the barrel is arranged in the through hole, the height of the annular partition plate inside the barrel body is obtained by performing table look-up calculation on a target pH value input in a central control device, and the table look-up content is obtained according to pre-calibration.
The hydrogen peroxide treatment part comprises a main pipeline electromagnetic valve, the main pipeline electromagnetic valve is fixedly arranged on a biogas slurry conveying main pipeline, the upstream part and the downstream part are respectively and fixedly connected with a hydrogen peroxide water inlet pipe and a hydrogen peroxide water outlet pipe through a tee joint, the hydrogen peroxide water inlet pipe and the hydrogen peroxide water outlet pipe are respectively and fixedly provided with a hydrogen peroxide water inlet electromagnetic valve and a hydrogen peroxide water outlet electromagnetic valve, the hydrogen peroxide water inlet electromagnetic valve and the hydrogen peroxide water outlet electromagnetic valve are respectively and fixedly connected with an inlet and an outlet of a venturi through a tee joint, and a venturi negative pressure port is fixedly connected with a hydrogen peroxide barrel through a hose;
the ultraviolet and ozone coupling treatment part comprises an ozone generator, the ozone generator is fixedly connected with a pagoda joint of a reactor base through a hose, the reactor base is fixedly connected with an ozone aeration stone through internal threads and fixedly connected with the bottom of a spiral reactor through external threads, the top of the spiral reactor is fixedly provided with a liquid level monitor and a ventilation electromagnetic valve, the spiral reactor is fixedly arranged in a socket structure consisting of an upper shell, a middle shell and a lower shell, an ultraviolet lamp post is fixedly arranged in the hollow part of the spiral reactor, and the ultraviolet lamp post is in socket connection with a groove of the upper shell;
furthermore, the ultraviolet lamp post comprises a lamp cap and a post body, the diameter of the lamp cap is the same as the inner diameter of the primary groove of the upper shell, the diameter of the post body is the same as the diameter of the secondary groove of the upper shell, and the length of the post body is the same as the depth of the hollow part of the spiral reactor;
furthermore, the side surface of the upper shell is provided with a hole with the same size as the outlet of the spiral reactor, and is connected with the middle shell in a socket joint way;
furthermore, the bottom of the middle shell is provided with a semicircular hole which has the same shape with the inlet at the upper half part of the spiral reactor and is connected with the lower shell in a socket-and-spigot manner;
furthermore, the top of the lower shell is provided with a hemispherical groove which has the same size as the bottom of the spiral reactor and is provided with a semicircular hole which has the same shape as the inlet of the lower half part of the spiral reactor, the bottom of the lower shell is provided with a cylindrical groove and a cuboid groove, and the two grooves have the same depth and are intersected at the bottom of the hemispherical groove;
furthermore, the reactor base is provided with a drain outlet and a drain valve, and the drain valve is fixedly connected with the reactor base through threads;
provides an application method of a biogas slurry drip irrigation flow type pretreatment technology, which comprises the following steps:
s1: when the pH monitor cannot monitor the biogas slurry, closing the conveying pump and the conveying electromagnetic valve, simultaneously opening the replenishing pump and the replenishing electromagnetic valve, replenishing the biogas slurry in the biogas slurry preparation barrel, and when the liquid level monitor detects the biogas slurry, closing the replenishing pump and the replenishing electromagnetic valve to finish the biogas slurry replenishment;
s2: setting an expected pH value in a central control device, controlling the final height of a partition plate in the barrel body of a preparation barrel according to the pH value input by the setting, then closing a replenishing pump and a replenishing electromagnetic valve and closing a through hole switch in the barrel on an annular partition plate, opening a conveying pump, a conveying electromagnetic valve, a backflow electromagnetic valve, an acid adding pump and an acid adding electromagnetic valve, simultaneously closing a conveying main pipeline electromagnetic valve and a hydrogen peroxide water inlet electromagnetic valve, adjusting the opening and closing degree of the acid adding electromagnetic valve according to pH data transmitted by a pH monitor, and closing the acid adding pump and the acid adding electromagnetic valve when the pH value of the biogas slurry is adjusted to a preset range to finish the adjustment of the pH value of the biogas slurry;
s3: opening a main conveying pipeline electromagnetic valve and a hydrogen peroxide water inlet electromagnetic valve, then keeping a through hole switch in a barrel on an annular partition plate closed and opening a backflow electromagnetic valve, at the moment, mixing biogas slurry which is not filled with acid liquor and is positioned below the annular partition plate in a biogas slurry preparation barrel and acid liquor remained in a conveying pump, a pipeline where the conveying electromagnetic valve is positioned and a backflow pipe into a pipeline where the main conveying pipeline electromagnetic valve is positioned for a certain time period T, finally closing the backflow electromagnetic valve and opening the through hole switch in the barrel on the annular partition plate, and allowing hydrogen peroxide to enter the main conveying pipeline through a Venturi device according to a certain proportion for hydrogen peroxide treatment;
s4: when a liquid level monitor at the top of the spiral reactor monitors the biogas slurry, closing a conveying pump, a conveying electromagnetic valve, a conveying main pipeline electromagnetic valve, a hydrogen peroxide inlet electromagnetic valve, a hydrogen peroxide outlet electromagnetic valve, a ventilation electromagnetic valve and an irrigation electromagnetic valve, and simultaneously opening an ozone generator and an ultraviolet lamp post to realize the coupling treatment of hydrogen peroxide, ozone and ultraviolet rays;
s5: meanwhile, when the pH monitor cannot detect the biogas slurry, biogas slurry supply is carried out according to the step S1, and the pH of the biogas slurry is adjusted according to the step S2;
s6: after the coupling treatment of the hydrogen peroxide, the ozone and the ultraviolet rays is finished, the ozone generator is closed, the irrigation pump and the irrigation electromagnetic valve are opened, the biogas slurry pretreatment is finished, and the biogas slurry is conveyed to an irrigation system.
Further, in the steps S1 and S5, judging that the method that the pH monitor cannot monitor the biogas slurry is that the pH is less than or equal to 5;
further, a set of operation parameters suitable for the biogas slurry drip irrigation system pretreatment technology are provided, and specific parameter indexes comprise: acid concentration pH, hydrogen peroxide concentration C, ozone aeration time T1 and ultraviolet treatment time T2:
pH＝6.0,C＝25ml/l,T1＝75min,T2＝120min；
compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the cooperation of acidification treatment and oxidation treatment, on the premise of reducing nutrition loss of the biogas slurry, efficient pretreatment is realized, and the content of suspended matters in the biogas slurry is greatly reduced.
2. Aiming at the characteristic of slow biogas slurry returning pretreatment time efficiency, the invention provides a flowing type pretreatment technology, which greatly increases the working efficiency of biogas slurry returning and meets the practical requirement of efficient biogas slurry returning.
3. The biogas slurry drip irrigation pretreatment technology and the application thereof solve the problems of poor biogas slurry pretreatment effect and slow aging, greatly prolong the service life of a biogas slurry drip irrigation system, and provide a group of technical parameters suitable for the biogas slurry drip irrigation pretreatment, such as acid concentration pH, hydrogen peroxide concentration C, ozone aeration time T1, ultraviolet treatment time T2 and the like, have high feasibility for agricultural producers, and have important significance for promoting the popularization and application of the biogas slurry returning technology.
4. According to the invention, the upper space and the lower space of the partition plate in the biogas slurry preparation box are adjustable by arranging the liftable annular partition plate and the electronically-controlled openable through hole switch on the liftable annular partition plate, so that the residual acid solution can be diluted to a target pH while the pH value of the acid solution is kept for adjustment, a post-stage treatment device is protected, and the pH output of biogas slurry in the whole process is stable.
Drawings
FIG. 1 is a schematic view of a biogas slurry drip irrigation flow type pretreatment structure provided by the invention;
FIG. 2 is a schematic diagram of a pH adjustment unit according to the present invention;
FIG. 3 is a schematic view of a hydrogen peroxide treatment part according to the present invention;
FIG. 4 is an exploded view of the UV-ozone coupling part according to the present invention;
FIG. 5 is a schematic view of the top structure of the ultraviolet and ozone coupling treatment part according to the present invention;
FIG. 6 is a schematic view of the external structure of the ozone generator according to the present invention;
in the figure: 1. a biogas slurry supply main pipeline; 2. a make-up pump; 3. a supply solenoid valve; 4. a pH adjustment section; 401. a biogas slurry preparation tank; 402. biogas slurry vent holes; 403. a liquid level monitor; 404. a pH monitor; 405. a delivery solenoid valve; 406. a delivery pump; 407 a return solenoid valve; 408. a return pipe; 409. adding an acid barrel; 410. adding acid and ventilating holes; 411. adding an acid electromagnetic valve; 412. adding an acid pump; 413. an acid adding pipeline; 414. a central control device; 5. a hydrogen peroxide treatment unit; 501. a biogas slurry conveying main pipeline electromagnetic valve; 502. a hydrogen peroxide water inlet electromagnetic valve; 503. a hydrogen peroxide water outlet solenoid valve; 504. a venturi negative pressure port; 505. a hydrogen peroxide inlet line; 506. a hydrogen peroxide water outlet pipeline; 507. a hydrogen peroxide tank; 6. a biogas slurry conveying main pipeline; 7. an ultraviolet and ozone coupling treatment part; 701. an ultraviolet lamp post; 70101. a lamp cap; 70102. a cylinder; 702. an upper housing; 70201. a primary groove; 70202. a secondary groove; 703. a middle shell; 704. a screw reactor; 705. a lower housing; 706. a reactor base; 70601. ozone aeration stone; 70602. a pagoda joint; 70603 sewage draining outlet; 70604. a blowoff valve; 707. a liquid level monitor; 708. a ventilation electromagnetic valve; 8. an irrigation solenoid valve; 9. an irrigation pump.
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.
It should be noted that in the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Further, it will be appreciated that the dimensions of the various elements shown in the figures are not drawn to scale, for ease of description, e.g., the thickness or width of some layers may be exaggerated relative to other layers.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined or illustrated in one figure, it will not need to be further discussed or illustrated in detail in the description of the following figure.
As shown in fig. 1, a biogas slurry storage tank is fixedly communicated with the front end of a main biogas slurry supply pipeline 1, a supply pump 2 and a supply electromagnetic valve 3 are sequentially arranged along the flow direction of biogas slurry in the main biogas slurry supply pipeline 1, the rear end of the main biogas slurry supply pipeline 1 is fixedly connected to a pH adjusting portion 4, the pH adjusting portion 4 is fixedly connected to one end of a main biogas slurry conveying pipeline 6, the main biogas slurry conveying pipeline 6 is sequentially provided with a hydrogen peroxide treatment portion 5, an ultraviolet and ozone coupling treatment portion 7 and a water outlet portion along the flow direction of biogas slurry, the hydrogen peroxide treatment portion 5 is connected in parallel with the main biogas slurry conveying pipeline 1, the water inlet of the ultraviolet and ozone coupling treatment portion 7 is fixedly communicated with two sides of the main biogas slurry conveying pipeline 1 through a cross, the water outlet portion is fixedly communicated with another water outlet of the cross, and an electromagnetic valve 8 and an irrigation pump 9 are sequentially arranged along the flow direction of biogas slurry;
as shown in fig. 2, the pH adjusting portion 4 includes a biogas slurry circulating system, the biogas slurry circulating system includes a biogas slurry preparation tank 401, a biogas slurry vent 402 is fixedly installed at the top of the biogas slurry preparation tank 401, a central control device 414 is fixedly installed at the side surface, a liquid level monitor 403 and a pH monitor 404 are respectively installed at the side top and the side bottom, a water inlet and a water outlet of the biogas slurry preparation tank 401 are respectively and fixedly communicated with the end of a biogas slurry supply main pipeline and the front end of a biogas slurry conveying main pipeline 6, the biogas slurry conveying main pipeline 6 is sequentially provided with a conveying solenoid valve 405, a conveying pump 406 and a return pipe 408 along the flow direction of biogas slurry, a water inlet end of the return pipe 408 is fixedly connected to the biogas slurry conveying main pipeline 6 through a tee, a water outlet end is fixedly connected to a return port of the biogas slurry preparation tank 401, the return pipe 408 is fixedly provided with a return solenoid valve 407, an acid adding device is provided between the conveying pump 406 and the return pipe 408, the acid adding device includes an acid adding tank 409, an acid adding vent 410 is provided at the top of the acid adding tank 409, and the water outlet is fixedly connected to the acid adding pipeline 413, the end of the acid adding pipeline is fixedly connected to the biogas slurry conveying main pipeline 6 through a tee, and the acid adding solenoid valve 411 and the acid adding pump 412 are sequentially provided along the flow direction of the acid adding tank 409;
the overall height of the pH adjusting portion 4 is slightly higher than that of the hydrogen peroxide treating portion 5, an annular partition plate is arranged at the bottom inside the barrel body of the biogas slurry preparation barrel 401, the height of the partition plate inside the barrel body can be electrically controlled to lift, a through hole is formed in a partition plate body, an in-barrel through hole switch is arranged in the through hole, the height of the annular partition plate inside the barrel body is obtained by performing table look-up calculation on a target pH value input in the central control device 414, and the table look-up content is obtained according to pre-calibration.
As shown in fig. 3, the hydrogen peroxide treatment part 5 includes a main pipeline electromagnetic valve 501, the main pipeline electromagnetic valve 501 is fixedly installed on the biogas slurry conveying main pipeline 6, the upstream and downstream are respectively and fixedly connected with a hydrogen peroxide water inlet pipe 505 and a hydrogen peroxide water outlet pipe 506 through a tee joint, the hydrogen peroxide water inlet pipe 505 and the hydrogen peroxide water outlet pipe 506 are respectively and fixedly installed with a hydrogen peroxide water inlet electromagnetic valve 502 and a hydrogen peroxide water outlet electromagnetic valve 503, and are respectively and fixedly connected with the inlet and the outlet of the venturi through a tee joint, and the venturi negative pressure port 504 is fixedly connected with the hydrogen peroxide barrel through a hose;
as shown in fig. 4, 5 and 6, the ozone generator 709 is fixedly connected with a pagoda joint 70602 of a reactor base 706 through a hose, the reactor base 706 is fixedly connected with an ozone aeration stone 70601 through an internal thread and fixedly connected with the bottom of a spiral reactor 704 through an external thread, a liquid level monitor 707 and an air-permeable electromagnetic valve 708 are fixedly installed at the top of the spiral reactor 704, the spiral reactor 704 is fixedly installed in a socket structure composed of an upper shell 702, a middle shell 703 and a lower shell 705, an ultraviolet lamp column 701 is fixedly installed in the hollow part, and the ultraviolet lamp column 701 is socket-connected with a groove of the upper shell 702;
the ultraviolet lamp post 701 comprises a lamp cap 70101 and a cylinder 70102, the diameter of the lamp cap 70101 is the same as the inner diameter of the primary groove 70201 of the upper shell, the diameter of the cylinder 70102 is the same as the diameter of the secondary groove 70202 of the upper shell, and the length of the cylinder 70102 is the same as the depth of the hollow part of the spiral reactor 704;
the side surface of the upper shell 702 is provided with a hole with the same size as the outlet of the spiral reactor 704, and is connected with the middle shell 703 in a socket-and-spigot manner;
the bottom of the middle shell 703 is provided with a semicircular hole with the same shape as the inlet at the upper half of the spiral reactor 704, and is in socket joint with the lower shell 705;
the top of the lower shell 705 is provided with a hemispherical groove with the same size as the bottom of the spiral reactor 704, and is provided with a semicircular hole with the same shape as the inlet of the lower half part of the spiral reactor 704, the bottom of the lower shell 705 is provided with a cylindrical groove and a cuboid groove, and the two grooves have the same depth and are intersected at the bottom of the hemispherical groove;
the reactor base 706 is provided with a drain port 70603 and a drain valve 70604, and the drain valve 70604 is fixedly connected with the reactor base 706 through threads;
provides an application method of a biogas slurry drip irrigation flow type pretreatment technology, which comprises the following steps:
s1: when the pH monitor 404 cannot monitor the biogas slurry, the conveying pump 406 and the conveying electromagnetic valve 405 are closed, the replenishing pump 2 and the replenishing electromagnetic valve 3 are simultaneously opened, the biogas slurry is replenished in the biogas slurry preparation barrel 401, when the liquid level monitor 403 detects the biogas slurry, the replenishing pump 2 and the replenishing electromagnetic valve 3 are closed to finish the biogas slurry replenishment, and in the process, the through hole switch in the barrel on the annular partition plate is kept open, so that the biogas slurry is filled in the upper space and the lower space of the partition plate;
s2: setting a desired pH value in a central control device 414, controlling the final height of the partition board in the barrel body of the preparation barrel 401 according to the pH value input by the setting, then closing a supply pump 2 and a supply electromagnetic valve 3 and closing a through hole switch in the barrel on the annular partition board, opening a delivery pump 406, a delivery electromagnetic valve 405, a reflux electromagnetic valve 407, an acid adding pump 412 and an acid adding electromagnetic valve 411, simultaneously closing a delivery main pipeline electromagnetic valve 501 and a hydrogen peroxide water inlet electromagnetic valve 502, adjusting the opening and closing degree of the acid adding electromagnetic valve 411 according to pH data transmitted by a pH monitor 404, and closing the acid adding pump 412 and the acid adding electromagnetic valve 411 when the pH of the biogas slurry is adjusted to a preset range, thereby completing the adjustment of the pH of the biogas slurry;
s3: opening the main delivery pipeline electromagnetic valve 501 and the hydrogen peroxide water inlet electromagnetic valve 502, then keeping the through hole switch in the barrel on the annular partition closed and the return electromagnetic valve 407 open, at this moment, the biogas slurry which is in the preparation barrel 401 and is not filled with acid liquor and remains in the delivery pump 406, the pipeline where the delivery electromagnetic valve 405 is located and the acid liquor in the return pipe 408 enter the pipeline where the main delivery pipeline electromagnetic valve 501 is located to be mixed for a certain time period T, finally closing the return electromagnetic valve 407 and opening the through hole switch in the barrel on the annular partition, and hydrogen peroxide enters the main delivery pipeline 6 through the venturi device according to a certain proportion to be treated by hydrogen peroxide.
Therefore, the space above and below the partition plate in the biogas slurry preparation box is adjustable by arranging the liftable annular partition plate and the electrically-controlled openable through hole switch on the liftable annular partition plate, so that the residual acid solution can be diluted to the target pH while the pH value of the acid solution is kept for allocation, a post-stage treatment device is protected, and the pH value of the biogas slurry output in the whole process is stable.
S4: when biogas slurry enters and is gradually filled in the spiral reactor 704, when a liquid level monitor 707 at the top of the spiral reactor 704 monitors the biogas slurry, the conveying pump 406, the conveying electromagnetic valve 405, the conveying main pipeline electromagnetic valve 501, the hydrogen peroxide inlet electromagnetic valve 502, the hydrogen peroxide outlet electromagnetic valve 503, the ventilation electromagnetic valve 708 and the irrigation electromagnetic valve 8 are closed, and the ozone generator 709 and the ultraviolet lamp column 701 are simultaneously opened to realize the coupling treatment of hydrogen peroxide, ozone and ultraviolet rays;
s5: meanwhile, when the pH monitor 404 cannot detect the biogas slurry, biogas slurry replenishment is performed according to the step S1, and the pH of the biogas slurry is adjusted according to the step S2;
s6: after the coupling treatment of hydrogen peroxide, ozone and ultraviolet rays is completed, the ozone generator 709 is closed, the irrigation pump 9 and the irrigation electromagnetic valve 8 are opened, the biogas slurry pretreatment is completed, and the biogas slurry is conveyed to an irrigation system.
In the steps S1 and S5, judging that the pH value of the biogas slurry which cannot be monitored by a pH monitor is less than or equal to 5;
a set of operation parameters suitable for the biogas slurry drip irrigation system pretreatment technology is provided, and the specific parameter indexes comprise: acid concentration pH, hydrogen peroxide concentration C, ozone aeration time T1 and ultraviolet treatment time T2:
pH＝6.0,C＝25ml/l,T1＝75min,T2＝120min；
the scheme solves the problems of poor biogas slurry drip irrigation pretreatment effect and slow aging, provides a set of technical parameters which are suitable for a biogas slurry drip irrigation system, such as acid addition concentration, hydrogen peroxide concentration, long ozone aeration time, long ultraviolet treatment time and the like, and better promotes the efficient returning of biogas slurry on the premise of realizing the efficient pretreatment of the biogas slurry drip irrigation. Meanwhile, the method has higher implementability for agricultural producers and has important significance for promoting the popularization and application of the biogas slurry returning technology, and in addition, more ingeniously, the space above and below the partition plate in the biogas slurry preparation box is adjustable by arranging the liftable annular partition plate and the electrically-controlled openable through hole switch on the liftable annular partition plate, so that the residual acid solution can be diluted to the target pH while the pH value of the acid solution is kept for allocation, a post-stage treatment device is protected, and the pH output of the biogas slurry in the whole process is stable.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A flowing type pretreatment device for biogas slurry drop irrigation comprises a main biogas slurry supply pipeline (1), wherein a biogas slurry storage pool is fixedly communicated with the front end of the main biogas slurry supply pipeline (1), a replenishment pump (2) and a replenishment electromagnetic valve (3) are sequentially arranged along the flow direction of biogas slurry in the main biogas slurry supply pipeline (1), the rear end of the main biogas slurry supply pipeline (1) is fixedly connected to a pH adjusting part (4), the pH adjusting part (4) is fixedly connected to one end of a main biogas slurry conveying pipeline (6), the main biogas slurry conveying pipeline (6) is sequentially provided with a hydrogen peroxide treatment part (5), an ultraviolet and ozone coupling treatment part (7) and a water outlet part along the flow direction of biogas slurry, the hydrogen peroxide treatment part (5) is connected in parallel to the main biogas slurry conveying pipeline (1), the water inlet of the ultraviolet and ozone coupling treatment part (7) is fixedly communicated with two sides of the main biogas slurry conveying pipeline (1) through a cross joint, the water outlet part is fixedly communicated with the other water outlet of the cross joint, and an irrigation electromagnetic valve (8) and an irrigation pump (9) are sequentially arranged along the flow direction of the biogas slurry;
the pH adjusting part (4) comprises a biogas slurry circulating system which comprises a cylindrical biogas slurry preparation barrel (401), a biogas slurry vent hole (402) is fixedly arranged at the top of the biogas slurry preparation barrel (401), a central control device (414) is fixedly arranged at the side surface, a liquid level monitor (403) and a pH monitor (404) are respectively arranged at the side top and the side bottom, and the water inlet and the water outlet of the biogas slurry preparation barrel (401) are respectively and fixedly communicated with the tail end of the biogas slurry supply main pipeline (1) and the front end of the biogas slurry conveying main pipeline (6), the biogas slurry conveying main pipeline (6) is sequentially provided with a conveying electromagnetic valve (405), a conveying pump (406) and a return pipe (408) along the biogas slurry flowing direction, the water inlet end of the return pipe (408) is fixedly connected with a biogas slurry conveying main pipeline (6) through a tee joint, and the water outlet end is fixedly connected with the return port of the biogas slurry preparation barrel (401), the return pipe (408) is fixedly provided with a return electromagnetic valve (407), an acid adding device is arranged between the delivery pump (406) and the return pipe (408), the acid adding device comprises an acid adding barrel (409), an acid adding vent hole (410) is arranged at the top of the acid adding barrel (409), the water outlet is fixedly connected with an acid adding pipeline (413), the tail end of the acid adding pipeline (413) is fixedly connected with a biogas slurry conveying main pipeline (6) through a tee joint, and an acid adding electromagnetic valve (411) and an acid adding pump (412) are sequentially arranged along the flowing direction of acid liquid;
the whole height of the pH adjusting part (4) is higher than that of the hydrogen peroxide treating part (5), an annular partition plate is arranged at the bottom inside the barrel body of the biogas slurry preparation barrel (401), the height of the partition plate inside the barrel body can be lifted in an electric control mode, a through hole is formed in a partition plate body, an in-barrel through hole switch is arranged in the through hole, the height of the annular partition plate inside the barrel body is obtained by performing table look-up calculation on a target pH value input in a central control device (414), and the table look-up content is obtained according to pre-calibration.
2. The flowing type pretreatment device for biogas slurry drip irrigation according to claim 1, characterized in that the hydrogen peroxide treatment part (5) comprises a main pipeline electromagnetic valve (501), the main pipeline electromagnetic valve (501) is fixedly installed on the biogas slurry conveying main pipeline (6), a hydrogen peroxide water inlet pipe (505) and a hydrogen peroxide water outlet pipe (506) are respectively and fixedly connected to the upstream and the downstream through a tee joint, a hydrogen peroxide water inlet electromagnetic valve (502) and a hydrogen peroxide water outlet electromagnetic valve (503) are respectively and fixedly installed on the hydrogen peroxide water inlet pipe (505) and the hydrogen peroxide water outlet pipe (506), and are respectively and fixedly connected to the inlet and the outlet of the venturi through a tee joint, and the venturi negative pressure port (504) is fixedly connected to the hydrogen peroxide barrel through a hose;
ultraviolet ray and ozone coupling processing portion (7) include ozone generator (709), ozone generator (709) pass through pagoda joint (70602) fixed connection of hose and reactor base (706), go up through internal thread fixed connection in ozone aeration stone (70601) and through external screw thread fixed connection in spiral reactor (704) bottom on reactor base (706), spiral reactor (704) top fixed mounting has liquid level monitor (707) and air solenoid valve (708), and spiral reactor (704) fixed mounting is in the socket and spigot structure that last casing (702), well casing (703) and lower casing (705) are constituteed, and hollow portion fixed mounting has ultraviolet lamp post (701), ultraviolet lamp post (701) and last casing (702) recess socket joint.
3. The flowing pretreatment device for biogas slurry drip irrigation according to claim 2, characterized in that the ultraviolet lamp column (701) comprises a lamp cap (70101) and a column body (70102), the diameter of the lamp cap (70101) is the same as the inner diameter of the primary groove (70201) of the upper shell, the diameter of the column body (70102) is the same as the diameter of the secondary groove (70202) of the upper shell, and the length of the column body (70102) is the same as the depth of the hollow part of the spiral reactor (704).
4. The flowing pretreatment device for biogas slurry drip irrigation according to claim 2, characterized in that the side of the upper shell (702) is provided with a hole with the same size as the outlet of the spiral reactor (704) and is in socket connection with the middle shell (703).
5. The flowing type pretreatment device for biogas slurry drip irrigation according to claim 2, characterized in that the bottom of the middle shell (703) is provided with a semicircular hole with the same shape as the inlet at the upper half of the spiral reactor (704), and is socket-connected with the lower shell (705).
6. The flowing type pretreatment device for biogas slurry drip irrigation according to claim 2, characterized in that a hemispherical groove with the same size as the bottom of the spiral reactor (704) is arranged at the top of the lower shell (705), a semicircular hole with the same shape as the inlet at the lower half part of the spiral reactor (704) is arranged at the top of the lower shell, a cylindrical groove and a rectangular groove are arranged at the bottom of the lower shell (705), and the two grooves have the same depth and intersect at the bottom of the hemispherical groove.
7. The flowing type pretreatment device for biogas slurry drip irrigation according to claim 2, characterized in that the reactor base (706) is provided with a drain outlet (70603) and a drain valve (70604), and the drain valve (70604) is fixedly connected with the reactor base (706) through threads.
8. Use of a biogas slurry drip irrigation flow type pretreatment device according to any one of the preceding claims, characterized by comprising the following steps:
s1: when the pH monitor (404) cannot monitor the biogas slurry, closing the conveying pump (406) and the conveying electromagnetic valve (405), simultaneously opening the replenishing pump (2) and the replenishing electromagnetic valve (3), replenishing the biogas slurry in the biogas slurry preparation barrel (401), closing the replenishing pump (2) and the replenishing electromagnetic valve (3) when the liquid level monitor (403) detects the biogas slurry, and completing the biogas slurry replenishment, wherein in the process, the opening and closing of a through hole in the barrel on the annular partition plate are kept open, so that the biogas slurry is filled in the upper space and the lower space of the partition plate;
s2: setting a desired pH value in a central control device (414), controlling the final height of the partition board in the barrel body of the preparation barrel (401) according to the pH value input by the setting, then closing a replenishing pump (2) and a replenishing electromagnetic valve (3) and closing a through hole switch in the barrel on the annular partition board, opening a conveying pump (406), a conveying electromagnetic valve (405), a reflux electromagnetic valve (407), an acid adding pump (412) and an acid adding electromagnetic valve (411), simultaneously closing a conveying main pipeline electromagnetic valve (501) and a hydrogen peroxide water inlet electromagnetic valve (502), adjusting the opening and closing degree of the acid adding electromagnetic valve (411) through pH data transmitted by a pH monitor (404), and closing the acid adding pump (412) and the acid adding electromagnetic valve (411) after the pH value of the biogas slurry is adjusted to a preset range to complete adjustment of the pH value of the biogas slurry;
s3: opening a main conveying pipeline electromagnetic valve (501) and a hydrogen peroxide water inlet electromagnetic valve (502), then keeping a through hole switch in a barrel on an annular partition closed and opening a backflow electromagnetic valve (407), at the moment, biogas slurry which is positioned below the annular partition in a biogas slurry preparation barrel (401) and is not filled with acid liquid and acid liquid remained in a conveying pump (406), a pipeline where a conveying electromagnetic valve (405) is positioned and a backflow pipe (408) enter a pipeline where the main conveying pipeline electromagnetic valve (501) is positioned to be mixed for a certain time period T, finally closing the backflow electromagnetic valve (407) and opening the through hole switch in the barrel on the annular partition, and hydrogen peroxide enters a main conveying pipeline (6) through a venturi device according to a certain proportion to be treated by the hydrogen peroxide;
s4: when biogas slurry is monitored by a liquid level monitor (707) at the top of the spiral reactor (704), the conveying pump (406), the conveying electromagnetic valve (405), the conveying main pipeline electromagnetic valve (501), the hydrogen peroxide inlet electromagnetic valve (502), the hydrogen peroxide outlet electromagnetic valve (503), the ventilation electromagnetic valve (708) and the irrigation electromagnetic valve (8) are closed, and the ozone generator (709) and the ultraviolet lamp column (701) are simultaneously opened to realize the coupling treatment of hydrogen peroxide, ozone and ultraviolet rays;
s5: meanwhile, when the pH monitor (404) cannot detect the biogas slurry, biogas slurry supply is carried out according to the step S1, and the pH of the biogas slurry is adjusted according to the step S2;
s6: after the coupling treatment of the hydrogen peroxide, the ozone and the ultraviolet rays is finished, the ozone generator (709) is closed, the irrigation pump (9) and the irrigation electromagnetic valve (8) are opened, the biogas slurry pretreatment is finished, and the biogas slurry is conveyed to an irrigation system.
9. The application of the biogas slurry drip irrigation pretreatment device according to claim 8, characterized in that: and in the steps S1 and S5, judging that the pH value is less than or equal to 5 when the pH monitor cannot monitor the biogas slurry.
10. The application of the biogas slurry drip irrigation pretreatment device according to claim 8, wherein 1 set of operation parameters suitable for the pretreatment technology of the biogas slurry drip irrigation system is provided, and the specific parameter indexes comprise: acid concentration pH, hydrogen peroxide concentration C, ozone aeration time T1 and ultraviolet treatment time T2:
pH=6.0，C=25ml/L，T1=75min，T2=120min。
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| JPH10314763A (en) * | 1997-05-21 | 1998-12-02 | Taiyo Kagaku Kogyo Kk | Method for treatment of organic matter-containing waste liquid |
| CN101734818A (en) * | 2008-11-13 | 2010-06-16 | 南京理工大学 | Method and device for photo-oxidative degradation of typical organic micropollutants in raw water |
| CN101904288B (en) * | 2009-06-08 | 2011-12-07 | 北京市农林科学院 | Fertilizing equipment for precipitating, aerating, filtering and proportioning biogas slurry and increasing water-soluble oxygen |
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| CN214810402U (en) * | 2021-04-29 | 2021-11-23 | 浙江湖州欣安水务有限公司 | Acid adding and mixing device |
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