CN116177829A - Lateral flow micro-aeration coupled main flow electric drive anaerobic digestion method - Google Patents

Lateral flow micro-aeration coupled main flow electric drive anaerobic digestion method Download PDF

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Publication number
CN116177829A
CN116177829A CN202211574469.7A CN202211574469A CN116177829A CN 116177829 A CN116177829 A CN 116177829A CN 202211574469 A CN202211574469 A CN 202211574469A CN 116177829 A CN116177829 A CN 116177829A
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reaction system
aeration
micro
gas
main flow
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戴晓虎
李磊
陈永栋
刘昊宇
刘诗彧
杨东海
蔡辰
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Tongji University
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Tongji University
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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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • 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

Abstract

The invention relates to a lateral flow micro-aeration coupling main flow electric drive anaerobic digestion method, which comprises the following steps: the organic waste is pretreated and enters a side flow reaction system, aeration gas is pumped into the side flow reaction system through an aeration device, ORP is regulated and controlled in a feedback way, and the organic waste is subjected to anaerobic fermentation under the condition of micro-oxygen or facultative anaerobic to obtain mixed liquid and mixed gas; the obtained mixed gas enters a collecting device or a gas disturbance system, the obtained mixed liquid is pre-stirred by the gas disturbance system to obtain a pre-stirred mixed liquid, and the pre-stirred mixed liquid enters a main flow reaction system; the main flow reaction system eliminates residual free radicals in the obtained pre-stirred mixed solution through functional polar plate arrangement and micro-voltage introduction, and promotes digestion and methane production. Compared with the prior art, the anaerobic digestion method improves the reaction efficiency through the coupling design of the side flow reaction system and the main flow reaction system, and can realize the treatment and disposal of the organic solid waste with higher efficiency, higher stability and higher resource recovery capability.

Description

Lateral flow micro-aeration coupled main flow electric drive anaerobic digestion method
Technical Field
The invention relates to the technical field of anaerobic digestion treatment, in particular to a lateral flow micro-aeration coupling main flow electric drive anaerobic digestion method.
Background
Anaerobic digestion is an important means for realizing reduction, stabilization, harmlessness and recycling of organic solid wastes. The good anaerobic digestion reaction system is a guarantee for realizing the efficient operation of anaerobic digestion. Conventional anaerobic digestion reaction systems are completed in one reaction system, and multi-step reactions and various microorganism metabolic processes are performed in one system, and the reaction efficiency is limited by the slowest step reaction or the most sensitive microorganisms. Therefore, most anaerobic digestion control methods currently perform pretreatment before the main flow reaction system, or perform addition of functional materials or change of reaction conditions in the main flow reaction system. For example, patent CN202011184885.7 "strengthening sludge anaerobic digestion device and method based on electron transfer coupling microbial electrolytic cell", patent CN202111231427.9 "strengthening anaerobic digestion performance of main stream reaction system based on this idea" a micro aeration coupling microbial electrolytic cell wet garbage anaerobic treatment device and method ", etc.
However, the introduction of microbial cells or micro-aerators, while each having an elevating effect on a certain type of microorganism or a certain stage of reaction, inevitably produces disturbances on other microbial communities or other reactions in complex systems, and therefore, the reaction process is a "temporary stable solution" after the multi-step reactions are balanced with each other, rather than an "optimal solution" for achieving maximum elevation of each stage of the overall anaerobic digestion process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a lateral flow micro-aeration coupling main flow electric drive anaerobic digestion method.
The aim of the invention can be achieved by the following technical scheme:
the invention aims to provide a lateral flow micro-aeration coupled main flow electrically driven anaerobic digestion method, which comprises the following steps:
s1, pretreating organic waste, entering a side flow reaction system, pumping aeration gas through an aeration device, and feeding back to regulate ORP (oxidation-reduction potential), so that the organic waste is subjected to anaerobic fermentation under a micro-aerobic or facultative anaerobic condition to obtain mixed liquid and mixed gas;
s2, enabling the mixed gas obtained in the step S1 to enter a collecting device or enter a gas disturbance system, pre-stirring the mixed liquid obtained in the step S1 by the gas disturbance system to obtain a pre-stirred mixed liquid, and enabling the pre-stirred mixed liquid to enter a main flow reaction system;
s3, the main flow reaction system eliminates residual free radicals in the pre-stirred mixed solution obtained in the step S2 through functional polar plate arrangement and micro-voltage introduction, and promotes digestion and methane production of the mixed solution.
Preferably, for organic waste with large pH fluctuation, the pretreatment of the organic waste in step S1 includes adjusting the pH to 6.0 to 8.0.
Preferably, the aeration gas in step S1 is air or oxygen; the gas flow rate of the aeration gas is 0.01mL/min-100mL/min.
Preferably, the ORP modulation range in step S1 is-350 mV-100mV.
Preferably, the components of the mixture obtained in step S1 include nitrogen, carbon dioxide and hydrogen.
Preferably, the oxygen concentration in the mixture obtained in step S1 is not more than 10% and the methane concentration is not more than 20%.
Preferably, the gas flow pre-stirred by the gas stirring system in the step S2 is 0.01mL/min-50mL/min, and the time is 0.5h-5h.
Preferably, the functional polar plates in the main flow reaction system are annular polar plates, and the arrangement mode is vertical interval distribution.
Preferably, the volume ratio of the effective reaction area of the side flow reaction system to the main flow reaction system is 1:1-1:5.
Preferably, the lateral flow reaction system and the main flow reaction system are connected by a conduit and peristaltic pump.
The principle of the invention is as follows: the side flow reaction system and the main flow reaction system are designed, micro aeration is carried out on the side flow reaction system, and the aeration quantity is accurately regulated and controlled through ORP, so that the enrichment of facultative bacteria is realized, and organic wastes are efficiently hydrolyzed; the mixed gas of the side flow can be used for pre-stirring the mixed liquid entering the main flow through a gas disturbance system, so that the reaction mass transfer interface is optimized; after the mixed solution of the side flow enters the main flow, residual Reactive Oxygen Species (ROS) in the mixed solution is rapidly utilized by microorganisms in a functional polar plate in the main flow reaction system, so that the poison to methanogens is reduced; the electroactive microorganisms enriched in the functional polar plates in the mainstream reaction system can realize the high-efficiency methanation of volatile acid (VFA) in the sidestream mixed liquor.
Compared with the prior art, the invention has the following beneficial effects:
1) According to the anaerobic digestion method with the lateral flow micro-aeration coupled main flow electric drive, the lateral flow reaction system and the main flow reaction system are designed, the lateral flow micro-aeration coupled main flow electric drive is high in degradation efficiency, and the hydrolysis efficiency of organic wastes is higher.
2) The anaerobic digestion method of the lateral flow micro-aeration coupled main current drive provided by the technical scheme has high treatment efficiency and shorter Sludge Retention Time (SRT).
3) The anaerobic digestion method of the lateral flow micro-aeration coupled main current drive provided by the technical scheme has good stability and better stability under the condition of higher Organic Load Rate (OLR).
4) According to the anaerobic digestion method driven by the coupling of the side flow micro aeration and the main flow electricity, the electric active microorganisms enriched in the functional polar plates in the main flow reaction system can realize the high-efficiency methanation of volatile acid (VFA) in the side flow mixed liquid, so that the energy recovery rate is high, and the methane yield and the methane content are higher.
Drawings
FIG. 1 is a schematic flow diagram of a lateral flow micro-aeration coupled mainstream electrically driven anaerobic digestion process of the present invention.
FIG. 2 is a schematic diagram of a side-stream micro-aeration coupled primary-galvanic driven anaerobic digestion system in an embodiment of the invention.
The reference numerals in the figures indicate:
1. a first stirring motor; 2. a feed inlet; 3. a first stirring paddle; 4. a first electric heating rod; 5. a discharge port; 6. an aeration pipe; 7. an aeration disc; 8. an ORP probe; 9. a first biogas collection pipe; 10. a peristaltic pump; 11. a biological anode plate; 12. a biological cathode plate.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. Features such as a part model, a material name, a connection structure, a control method and the like which are not explicitly described in the technical scheme are all regarded as common technical features disclosed in the prior art.
A lateral flow micro-aeration coupled mainstream electrically driven anaerobic digestion method comprising the steps of:
s1, pretreating organic waste, entering a side flow reaction system, pumping aeration gas through an aeration device, and feeding back to regulate ORP (oxidation-reduction potential), so that the organic waste is subjected to anaerobic fermentation under a micro-aerobic or facultative anaerobic condition to obtain mixed liquid and mixed gas;
s2, enabling the mixed gas obtained in the step S1 to enter a collecting device or enter a gas disturbance system, pre-stirring the mixed liquid obtained in the step S1 by the gas disturbance system to obtain a pre-stirred mixed liquid, and enabling the pre-stirred mixed liquid to enter a main flow reaction system;
s3, the main flow reaction system eliminates residual free radicals in the pre-stirred mixed solution obtained in the step S2 through functional polar plate arrangement and micro-voltage introduction, and promotes digestion and methane production of the mixed solution.
Examples
The embodiment provides a lateral flow micro-aeration coupled main flow electrically driven anaerobic digestion method, which is carried out in a lateral flow micro-aeration coupled main flow electrically driven anaerobic digestion system.
The anaerobic digestion system with the coupling of the lateral flow micro-aeration and the main flow electric drive comprises a lateral flow reaction system and a main flow reaction system, wherein the lateral flow reaction system and the main flow reaction system are connected through a conduit and a peristaltic pump 10.
The side flow reaction system comprises a first reactor tank body, a first stirring motor 1, a feed inlet 2, a first stirring paddle 3, a first electric heating rod 4, a discharge port 5, an aeration pipe 6, an aeration disc 7, an ORP probe 8 and a first biogas collecting pipe 9; the first stirring paddle 3 penetrates through the first reactor tank body; the output end of the first stirring motor 1 is connected with the first stirring paddle 3 to drive the first stirring paddle 3 to rotate; the first electric heating rod 4 penetrates through the first reactor tank body; the feed inlet 2, the first discharge outlet 5 and the first biogas collecting pipe 9 are all arranged on the first reactor tank body; the aeration disc 7 and the ORP probe 8 are arranged at the bottom of the lateral flow reaction system; the aeration pipe 6 is connected with the aeration disc 7, a valve is arranged on the aeration pipe, the valve is connected with a controller in a wireless or wired way, and the controller is connected with the ORP probe 8 in a communication way; ORP data in the sidestream reaction system is collected by an ORP probe 8 and uploaded to a controller, and the controller controls the opening and closing of a valve to realize precise control of aeration quantity, so that enrichment of facultative microorganisms is realized, and efficient hydrolysis of organic matters in solid wastes is realized.
The main flow reaction system comprises a second reactor tank body, a second stirring motor, a second stirring paddle, a second electric heating rod, a biological anode plate 11 and a biological cathode plate 12; the second stirring paddle penetrates through the second reactor tank body; the output end of the second stirring motor is connected with the second stirring paddle so as to drive the second stirring paddle to rotate; the second electric heating rod penetrates through the second reactor tank body; the second discharge port and the second biogas collecting pipe are both arranged on the second reactor tank body; the biological anode plate 11 and the biological cathode plate 12 are annular electrode plates, are vertically distributed at intervals and are fixed on the wall of the main flow reaction system; the biological anode plate 11 and the biological cathode plate 12 are arranged at intervals up and down and are connected in series by two vertically arranged wires, the two vertically arranged wires are respectively connected with the positive electrode and the negative electrode of an external direct current power supply, so that the high-efficiency removal of residual oxidizing substances in biogas slurry of a side flow is realized to protect methanogens in a main flow, the high-efficiency methanation of hydrolysis acidification products can also be realized, the polar plates of a microbial electrolytic cell MEC are arranged in a main flow reaction system, on one hand, the polar plates can be used for eliminating residual active oxygen in the biogas slurry from the side flow reaction system to protect methanogens, and on the other hand, electroactive microorganisms can be enriched, and the high-efficiency methanation of hydrolysis and acid production products is realized.
According to the anaerobic digestion method driven by the lateral flow micro-aeration coupling main flow electricity, the anaerobic digestion system driven by the lateral flow micro-aeration coupling main flow electricity is adopted to treat kitchen waste, wherein the effective volume of the lateral flow reaction system is 1L, the effective volume of the main flow reaction system is 2L, the kitchen waste is taken from a swill barrel of a canteen of a certain university, the kitchen waste is carried back to a laboratory and then crushed, and the solid content (TS) is measured to be 8.72+/-0.17%, and the volatile ratio (VS/TS) is measured to be 96.76 +/-0.50%.
The anaerobic digestion method with the lateral flow micro-aeration coupled with the main flow electric drive comprises the following steps:
s1, pretreating organic waste, entering a side flow reaction system, pumping aeration gas through an aeration device, and feeding back to regulate ORP (oxidation-reduction potential), so that the organic waste is subjected to anaerobic fermentation under a micro-aerobic or facultative anaerobic condition to obtain mixed liquid and mixed gas;
s2, enabling the mixed gas obtained in the step S1 to enter a collecting device or enter a gas disturbance system, pre-stirring the mixed liquid obtained in the step S1 by the gas disturbance system to obtain a pre-stirred mixed liquid, and enabling the pre-stirred mixed liquid to enter a main flow reaction system;
s3, the main flow reaction system eliminates residual free radicals in the pre-stirred mixed solution obtained in the step S2 through functional polar plate arrangement and micro-voltage introduction, and promotes digestion and methane production of the mixed solution.
The specific implementation steps are as follows:
firstly, 1L of inoculation sludge and 2L of inoculation sludge are respectively added into a side flow reaction system and a main flow reaction system, the inoculation sludge is from a sludge anaerobic fermentation tank of a sewage treatment plant in the Shanghai, and nitrogen is respectively introduced into the two reactors for 10 minutes for shaping an anaerobic environment.
Subsequently, 100mL of kitchen waste is added into the side flow reaction system through the sample inlet 2, and the biogas slurry in the 100mL of side flow reaction system is conveyed into the main flow reaction system through the peristaltic pump 10, and meanwhile, 100mL of sludge is discharged into the main flow reaction system.
Subsequently, the first stirring motor 1 of the side flow reaction system is turned on, the first stirring motor 1 drives the first stirring paddle 3 to mix the biogas slurry in the flow measurement micro-aeration reactor, the second stirring motor of the main flow reaction system is turned on, the second stirring motor drives the second stirring paddle to mix the biogas slurry in the main flow reaction system, the biogas slurry in the two reactors are mixed at the same time, and air enters the side flow reaction system through the aeration pipe 6 and is uniformly dispersed in the side flow reaction system through the aeration disc 7.
The ORP probe 8 then begins recording the ORP value in the sidestream reaction system and uploads it to the controller. When the ORP in the system is detected to be higher than-350 mV, the aeration pipe valve is controlled to be closed by the controller, and the aeration is stopped.
Subsequently, with the introduction of air (micro-oxygen), the microorganisms in the lateral flow reaction system proliferate in large amounts, wherein facultative bacteria can breathe with oxygen as a final electron acceptor to obtain higher energy, and the proliferation rate is the fastest.
Subsequently, dissolved oxygen in the side stream reaction system is gradually consumed by microorganisms in the side stream reaction system, the ORP value in the side stream reaction system is gradually reduced, and when the ORP value is reduced to-420 mV, the controller controls to start a switch on the aerator pipe 6 to perform micro-aeration on the side stream reaction system.
When the biogas slurry in the side flow reaction system is conveyed into the main flow reaction system through the peristaltic pump 10, the residual Reactive Oxygen Species (ROS) in the biogas slurry are rapidly utilized by microorganisms positioned on the biological anode plate 11, so that the poison of ROS to methanogenic bacteria in the system is avoided.
Subsequently, methanogens in the mainstream reaction system, including microorganisms located on the biocathode plate 12, carry out efficient methanation of organic matter in the biogas slurry, and the generated biogas is discharged to a collecting device outside the mainstream reaction system through a biogas collecting pipe.
Wherein, only when sample is injected, the peristaltic pump 10 is required to be manually started, and the lateral flow reaction system and the main flow reaction system respectively and automatically operate at other times.
After the main flow reaction system stably operates, the pH value in the main flow reaction system does not obviously drop along with the operation of the system, so that the sample injection amount can be increased, the SRT is further shortened, and the more efficient kitchen waste treatment efficiency is realized.
The anaerobic digestion system adopting the method of the embodiment is compared with the anaerobic digestion system adopting the conventional microbial electrolytic cell or/and micro-aeration (comparative example), under the condition of the same micro-aeration and the same voltage intensity, the maximum value of the organic soluble protein and the soluble polysaccharide in the embodiment is improved by more than 20 percent compared with the comparative example, and the hydrolysis efficiency is greatly improved; the residence time of the sludge can be shortened by 30% compared with the comparative example; in the examples, the maximum methane production per day is 350mL/g VS, the comparison example is 278mL/g VS, the methane content is increased by more than 25%, and the methane content is also increased from 68% to 75%, so that the substantial technical effects of the technical scheme of the embodiment are fully illustrated.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.

Claims (10)

1. A lateral flow micro-aeration coupled mainstream electrically driven anaerobic digestion method, comprising the steps of:
s1, pretreating organic waste, entering a side flow reaction system, pumping aeration gas through an aeration device, and feeding back to regulate ORP (oxidation-reduction potential), so that the organic waste is subjected to anaerobic fermentation under a micro-aerobic or facultative anaerobic condition to obtain mixed liquid and mixed gas;
s2, enabling the mixed gas obtained in the step S1 to enter a collecting device or enter a gas disturbance system, pre-stirring the mixed liquid obtained in the step S1 by the gas disturbance system to obtain a pre-stirred mixed liquid, and enabling the pre-stirred mixed liquid to enter a main flow reaction system;
s3, the main flow reaction system eliminates residual free radicals in the pre-stirred mixed solution obtained in the step S2 through functional polar plate arrangement and micro-voltage introduction, and promotes digestion and methane production of the mixed solution.
2. The method of claim 1, wherein the pretreatment of the organic waste in step S1 comprises adjusting the pH to 6.0-8.0.
3. The method of anaerobic digestion with lateral flow micro-aeration coupled with main flow electric drive according to claim 1, wherein the aeration gas in step S1 is air or oxygen;
the gas flow rate of the aeration gas is 0.01mL/min-100mL/min.
4. The method of claim 1, wherein the ORP regulation in step S1 is in the range of-350 mV to 100mV.
5. The method of claim 1, wherein the mixture obtained in step S1 comprises nitrogen, carbon dioxide and hydrogen.
6. The method for anaerobic digestion by coupling side-stream micro-aeration with main stream electric drive according to claim 5, wherein the oxygen concentration in the mixed gas obtained in step S1 is not more than 10% and the methane concentration is not more than 20%.
7. The method for anaerobic digestion by coupling side flow micro aeration with main flow electric drive according to claim 1, wherein the gas flow pre-stirred by the gas disturbance system in the step S2 is 0.01mL/min-50mL/min, and the time is 0.5h-5h.
8. The method for anaerobic digestion by coupling side flow micro aeration with main flow electric drive according to claim 1, wherein the functional polar plates in the main flow reaction system are annular polar plates and are distributed vertically at intervals.
9. The method for anaerobic digestion by coupling side-stream micro-aeration with main stream electric drive according to claim 1, wherein the volume ratio of the effective reaction areas of the side-stream reaction system and the main stream reaction system is 1:1-1:5.
10. A lateral flow micro-aeration coupled mainstream electrically driven anaerobic digestion process according to claim 1, wherein the lateral flow reaction system and the mainstream reaction system are connected by a conduit and peristaltic pump (10).
CN202211574469.7A 2022-12-08 2022-12-08 Lateral flow micro-aeration coupled main flow electric drive anaerobic digestion method Pending CN116177829A (en)

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