TWI709539B - Compound anaerobic trawl biological reaction system - Google Patents

Abstract

A compound anaerobic trawling flow biological reaction system, comprising a trawling flow reactor, a waste liquid regulating tank, an alkaline regulating tank, a desulfurization device, a power generation device, and a thermostat; it is characterized in that the trawling flow reactor includes methane Fermentation tank and trailing flow hydrolysis and acidification tank; the methane fermentation tank has an alkali conveying pipeline connected with the alkali adjustment tank, a mud drain tank is arranged below, a gas collecting hood is arranged at the top, and an overflow is adjacent to the opening; The trawl hydrolysis and acidification tank has a waste liquid conveying pipeline connected with the waste liquid regulating tank, a self-produced biogas conveying pipeline inlet is arranged above the inside of the methane fermentation tank, and an overflow is arranged above the trawling hydrolysis acidification tank; According to this, through the internal and external tank anaerobic digestion process and the self-produced biogas delivery pipeline design of the trawl hydrolysis and acidification tank, the waste liquid in the trawl hydrolysis and acidification tank is mixed with the bacteria and the growth and reproduction conditions are uniform, and the hydrolysis and acidification are effectively improved. , Form small molecules with fermented methane to promote the conversion ability of biogas generating bacteria and increase biogas production.

Description

Compound anaerobic trawl biological reaction system

The invention relates to a compound anaerobic trailing flow biological reaction system that adopts a solid-liquid non-separation anaerobic fermentation method, makes full use of the organic matter of manure, urine and wastewater from livestock farms, increases the output of biogas, and reduces the amount of biogas residue and sludge.

The current animal husbandry manure wastewater treatment system, as shown in Figure 1, mainly collects pig manure wastewater in a pumping well, and then undergoes three main stages: solid-liquid separation, anaerobic treatment, and aeration treatment (aerobic treatment). Carry out wastewater treatment.

Solid-liquid separation is the separation of solid organic matter in pig manure wastewater from water. The products are organic solids and wastewater. The organic solids are directly sent to the composting yard for composting. Because composting requires a larger space, and Odor is produced.

Anaerobic treatment is the anaerobic digestion treatment of the wastewater products after solid-liquid separation by hydrolysis acidification and methanation in the same tank fermentation. The products after treatment are biogas, sludge and wastewater. The sludge products are deposited in a sedimentation tank and then The drying process produces sludge. Because the waste water product after solid-liquid separation treatment of pig manure wastewater contains less organic matter, and because the hydrolytic acidification and methanation are fermented in the same tank, the biogas production is low and the efficiency is low; in addition, anaerobic The treatment is carried out simultaneously with hydrolysis, acidification, acetic acid production, and methanation. Due to the different growth conditions of hydrolytic acid producing bacteria and methanogenic bacteria, the former is an acidic environment and the latter is an alkaline environment. Adjusting pH is difficult to operate and control, which reduces the treatment efficiency.

Aeration treatment (aerobic treatment) is to carry out aerobic aeration treatment on the waste water product after anaerobic treatment, and then discharge or recycle after sedimentation treatment in the final sedimentation tank.

Since the process of anaerobic treatment to produce methane must go through the acidification period and the methane fermentation period, the single-tank fermentation design of the treatment device is not conducive to the metabolic reaction of acetic acid and propionic acid in the second stage of methane fermentation period, making the efficiency of methane generation impossible Gained promotion. In addition, since the above-mentioned excrement waste water is first subjected to solid-liquid separation treatment, the waste water sent to the anaerobic treatment contains less organic matter, so the yield of biogas is low.

In view of this, the inventor of the present invention aims at the low efficiency shortcomings of the three-stage wastewater treatment commonly used in livestock farms to produce biogas. After detailed design and careful evaluation, the present invention is finally produced that is indeed practical.

The present invention solves the problems of the prior art: in view of the main technical shortcomings of anaerobic treatment using the same tank for hydrolysis, acidification and methanation, it provides a solid-liquid non-separation design method for solid-liquid anaerobic digestion procedures. The purpose is to provide a design of the best growth environment with inner and outer tanks with different pH values and separate different bacterial species, so that the hydrolysis acidification reaction and the methanation reaction have different reaction conditions to achieve high-rate degradation of COD and high organic load Treatment, full fermentation and decomposition to reduce sludge, so that biogas production can be increased, and wastewater recovery efficiency can be improved.

In order to achieve the above objective, the technical means adopted by the present invention is: a dual anaerobic trawl biological reaction system, including a trawl reactor, a waste liquid regulating tank, an alkaline regulating tank, a desulfurization device, a power generation device and a constant temperature device Characterized in that, the trawl reactor includes a methane fermentation tank and at least one trawl hydrolysis acidification tank provided in the methane fermentation tank; the methane fermentation tank has a sludge discharge tank, an alkaline conveying pipeline, and a gas gathering The hood and overflow, the sludge drainage tank is located below, alkaline The conveying pipeline is connected with the alkaline regulating tank, the gas collecting hood is arranged above the opening, and the overflow is arranged near the opening; the trailing flow hydrolysis acidification tank has a waste liquid conveying pipeline, a self-produced biogas conveying pipeline and an overflow The said waste liquid conveying pipeline is connected with the waste liquid regulating tank, the inlet of the self-produced biogas conveying pipeline is set above the inside of the aforementioned methane fermentation tank, the outlet is set at the bottom of the trailing flow hydrolysis acidification tank, and the self-produced biogas conveying pipe A pump is provided on the road, and the overflow is arranged above the trawl hydrolysis and acidification tank, and the overflow of the trawl hydrolysis and acidification tank is higher than the overflow of the aforementioned methane fermentation tank.

The present invention is a dual anaerobic trawl biological reaction system, in which the waste liquid in the trawl hydrolysis and acidification tank has better hydrolysis and acidification reaction conditions when the acid-base value is acidic, and the preferred pH is 5, so it enters the trawl The waste liquid in the flow hydrolysis acidification tank can be pre-adjusted to acidity (pH 5) in the waste liquid adjustment tank, so that the waste liquid sent to the trailing flow hydrolysis acidification tank can obtain a better hydrolysis and acidification reaction environment. In addition, the waste liquid in the methane fermentation tank has better methanation reaction conditions when the acid-base value is alkaline, and the pH value of the methane fermentation tank is preferably 7, and the waste liquid in the methane fermentation tank can be processed through the alkaline adjustment tank. Acid-base neutralization makes the waste liquid inside the methane fermentation tank obtain better conditions for the methanation reaction.

The present invention is a compound anaerobic trawl biological reaction system, which mainly adopts the internal and external double-tank solid-liquid non-separation design of the trawl hydrolysis acidification tank and the methane fermentation tank to carry out the solid-liquid anaerobic digestion process, and the internal and external tanks with different pH values In the best growth environment separated by different bacterial species, the treatment of waste water sources and the anaerobic digestion and decomposition reactions provide better conditions, so as to reduce the amount of biogas residue and increase the output of biogas.

A further technical feature of the present invention is that the height of the inlet of the self-produced biogas transportation pipeline is higher than the overflow of the methane fermentation tank.

A further technical feature of the present invention is that the height of the overflow port of the trailing flow hydrolysis acidification tank is higher than the overflow port of the methane fermentation tank, and the preferred height is between 50 cm and 1 m.

A further technical feature of the present invention is that the desulfurization device has an inlet pipe and an outlet pipe, the inlet pipe is connected to the gas collecting hood, the outlet pipe is connected to the power generation device, and the thermostat There are heat energy recovery pipelines and heating pipelines, the heat energy recovery pipelines are connected with the power generation device, and the heating pipelines are wound around the tank body of the methane fermentation tank.

Based on the above described technical features of the present invention, the advantages of the present invention are:

(1) The solid-liquid anaerobic digestion process is carried out by adopting the solid-liquid non-separation design method of the inner tank trailing flow hydrolysis acidification tank and the outer tank methane fermentation tank to increase the quality of organic matter. Compared with the existing three-stage wastewater treatment technology on the market, Its biogas production can be increased by more than 100%.

(2) Provide internal and external tanks with different pH values and the best growth environment separated by different bacterial species, so that the treatment of waste water sources and the anaerobic digestion and decomposition reactions provide better conditions to reduce the amount of biogas residue and sludge. The purpose of biogas production.

(3) The design of the anaerobic digestion process of the inner and outer tanks provides compound hydrolysis, acidification, and formation of small molecules with fermented methane, and uses the monomers of proliferation and hydrolysis to promote the conversion ability of biogas generating bacteria, which can produce more biogas. Increase the best way to improve energy efficiency. Its biogas application desulfurization equipment purification and parallel combined heat and power generation system integration can significantly reduce CO, CO2, and nitrogen oxide emissions, and effectively solve the problem of pig manure waste liquid sewage.

(4) The design of the internal and external tank anaerobic digestion process provides high-rate degradation of COD, full fermentation and decomposition to reduce sludge, high organic load treatment, and improved wastewater recovery efficiency.

(5) Since the hydrolysis treatment method is a method of rapid acidification of the trailing flow, the tank design cost can be reduced.

10‧‧‧Trawl flow reactor

20‧‧‧Waste Liquid Adjustment Tank

30‧‧‧Alkaline adjustment tank

40‧‧‧Desulfurization device

41‧‧‧Air intake pipe

42‧‧‧Exhaust line

50‧‧‧Generator

60‧‧‧ Thermostat

61‧‧‧Heat energy recovery pipeline

62‧‧‧Heating pipeline

70‧‧‧Trawl hydrolysis and acidification tank

71‧‧‧Waste liquid conveying pipeline

72‧‧‧Self-produced biogas delivery pipeline

73‧‧‧Overflow port

74‧‧‧Pump

80‧‧‧Methane fermentation tank

81‧‧‧ Mud drain

82‧‧‧Alkali liquid delivery pipeline

83‧‧‧Air collecting hood

84‧‧‧Overflow port

Figure 1 is a schematic diagram of a conventional three-stage treatment system for pig manure wastewater.

Figure 2 is a schematic diagram of a compound anaerobic trawl biological reaction system according to a preferred embodiment of the present invention.

Figure 3 is a schematic diagram of the use state of the compound anaerobic trawl biological reaction system according to the preferred embodiment of the present invention.

In order to make the objectives, features, and advantages of the present invention more obvious and understandable, a preferred embodiment is specifically cited below, and is described in detail in conjunction with the accompanying drawings. The structures, proportions, sizes, etc. shown in the drawings in this specification are only used to match the disclosure of the specification, for the understanding and reading of those familiar with the art, and are not intended to limit the implementation of the present invention. Conditions, any structural modification, size adjustment, or change in the proportional relationship, without substantial changes to the technical content, shall also be regarded as the scope of the present invention can be implemented.

Please refer to Figure 2, which discloses a dual anaerobic trawl biological reaction system, including: a trawl reactor 10, a waste liquid regulating tank 20, an alkali regulating tank 30, a desulfurization device 40, a power generation device 50 and a thermostat device 60; the trailing flow reactor 10 includes a trailing flow hydrolysis and acidification tank 70 and a methane fermentation tank 80, and the trailing flow hydrolysis and acidification tank 70 is arranged inside the methane fermentation tank 80.

The trailing flow hydrolysis acidification tank 70 has a waste liquid conveying pipe 71, a self-produced biogas conveying pipe 72, and an overflow port 73; the waste liquid conveying pipe 71 is in communication with the waste liquid regulating tank 20, and the waste liquid regulating tank 20 The pH of the waste liquid can be adjusted to be acidic ( pH value 5) in advance , and then sent to the trawl hydrolysis and acidification tank 70 for hydrolysis and acidification; the inlet of the self-produced biogas transportation pipeline 72 is set above the inside of the methane fermentation tank 80, The outlet is set at the bottom of the trawl hydrolysis and acidification tank 70, and the self-produced biogas transportation pipeline 72 is provided with a pump 74, through which the self-produced biogas can be returned to the trawl hydrolysis and acidification tank 70. The overflow port 73 It is arranged above the trailing flow hydrolysis and acidification tank 70, and the overflow port 73 of the trailing flow hydrolysis and acidification tank 70 is higher than the overflow port 84 of the aforementioned methane fermentation tank 80.

The methane fermentation tank 80 has a sludge discharge tank 81, an alkaline conveying pipeline 82, a gas collecting hood 83 and an overflow port 84. The sludge discharge tank 81 is arranged below, and the alkaline conveying pipeline 82 is in communication with the alkaline regulating tank 30 , The gas collecting hood 83 is provided above the opening of the methane fermentation tank 80, and the overflow port 84 is provided at the position adjacent to the opening of the methane fermentation tank 80, and the height is lower than the height of the overflow port 73 of the aforementioned drag flow hydrolysis acidification tank 70; The alkali adjustment tank 30 contains alkali adjustment liquid, which is sent into the methane fermentation tank 80 through the alkali conveying pipe 82 to change the acidic waste liquid from the aforementioned trawl hydrolysis acidification tank 70 into alkali ( pH 7 ), so that the methane fermentation tank 80 has a better methanation environment, thereby increasing the biogas production.

The desulfurization device 40 has an air inlet pipe 41 and an air outlet pipe 42; the air inlet pipe 41 is connected with the gas collecting hood 83, and the air outlet pipe 42 is connected with the power generating device 50.

The thermostat 60 has a heat recovery pipeline 61 and a heating pipeline 62; the heat recovery pipeline 61 is connected to the power generation device 50, and the heating pipeline 62 is wound around the tank body of the methane fermentation tank 80.

Please refer to FIG. 3, which shows a schematic diagram of the use state of a dual anaerobic trawl biological reaction system of the present invention. The system operation process of the present invention includes:

Hydrolysis acidification process:

(1) The waste liquid is first adjusted to be acidic (pH 5) through the waste liquid adjusting tank 20, and then sent to the trawl hydrolysis and acidification tank 70 through the waste liquid conveying pipe 71 for the hydrolysis and acidification reaction, and in the hydrolysis During the reaction process, the self-produced biogas can be returned from the self-produced biogas transportation pipeline 72 to the inside of the trawl hydrolysis and acidification tank 70 through the pump 74 of the self-produced biogas transportation pipeline 72 to provide microorganisms in the trawl hydrolysis and acidification tank 70 It is easy to grow and multiply conditions, and maintain the uniformity of mixing of waste liquid and bacteria.

(2) The hydrolytic acidification treatment method is the early stage of anaerobic treatment. Due to the different growth conditions of hydrolytic acid producing bacteria and methanogenic bacteria, the former is suitable for acidic environments and the latter is suitable for alkaline environments. During the hydrolysis and acidification process, control the waste liquid to use hydrolysis bacteria and acidification under the condition that it contains a large number of hydrolysis bacteria and acidification bacteria. Bacteria hydrolyze insoluble organic matter in water into soluble organic matter, and the process of converting difficult-biodegradable macromolecular substances into easily biodegradable small molecules, which can effectively improve the biodegradability of wastewater and provide a good water environment for subsequent methanation treatment Therefore, separating the hydrolysis acidification and methanation in the mixed anaerobic digestion can provide the best acid-base reaction environment.

(3) Hydrolysis acidification treatment is mainly used for wastewater with high organic concentration. Due to the different types of wastewater, the hydrolysis rate of organic substances contained in the wastewater is different. The residence time in the trawl hydrolysis acidification tank 70 will naturally not be the same, so in order to provide better Conditions, the residence time of the present invention in the trawl hydrolysis and acidification tank 70 is 1 day, and the rising flow rate in the tank can be adjusted according to the setting height and quantity of the trawling hydrolysis and acidification tank 70. One trawling hydrolysis and acidification tank 70 (height is 2.4 m), the rising flow rate can be set to 0.1m/h.

Methanation process:

(1) The waste liquid treated by the trawl hydrolysis and acidification tank 70 overflows into the methane fermentation tank 80 from the overflow port 73 above the trawl hydrolysis and acidification tank 70. At this time, the waste liquid is acidic, so it needs to pass through an alkaline The adjusting tank 30 provides lye, and the lye is sent into the methane fermentation tank 80 through the alkali conveying pipe 82, so that the acid-base value of the waste liquid inside the methane fermentation tank 80 changes to an alkaline (pH 7) reaction environment.

(2) In addition, in the methane fermentation tank 80, the heating pipe 62 of the constant temperature device 60 is wound on the side wall of the methane fermentation tank 80 to provide a better fermentation temperature inside the methane fermentation tank 80; and the methane fermentation tank 80 The residence time HRT of the waste liquid in the methanation reaction is set to 10 days.

Biogas desulfurization and power generation process:

The biogas produced by the methane fermentation tank 80 is collected through the gas collecting hood 83, and then sent to the desulfurization device 40 through the inlet pipe 41 for desulfurization treatment, and the desulfurized gas is sent to the power generation device 50 through the gas outlet pipe 42 Carry out combustion to generate electricity.

Heat recovery process:

(1) The combustion heat energy of the power generation device 50 is recovered through the heat energy recovery pipe 61 to the water tank in the thermostat 60 to heat the water (liquid) so that the water (liquid) maintains a set temperature and maintains a constant temperature.

(2) The constant temperature device 60 heats the water (liquid) in the water tank at a constant temperature through the heating pipe 62 to heat the liquid inside the methane fermentation tank 80 through Bangpu.

The invention adopts the solid-liquid non-separation design method of the inner tank trailing flow hydrolysis acidification tank 70 and the outer tank methane fermentation tank 80 to carry out the solid-liquid anaerobic digestion process, and provides the inner and outer tanks with different pH values and those with different bacterial species. The optimal growth environment provides better conditions for the treatment of waste water sources and anaerobic digestion and decomposition reactions, achieving the purpose of reducing the amount of biogas residue and sludge and increasing the output of biogas. It is in line with the concept of environmental protection and green resource utilization. Practicability meets the needs of industrial development, and the disclosed invention is also unprecedented, novel, and more efficient than conventional processing systems, and it should be considered progressive.

In summary, it is only a preferred embodiment of the present invention, and cannot be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the contents of the specification should remain It falls within the scope of the present invention.

10‧‧‧Trawl flow reactor

20‧‧‧Waste Liquid Adjustment Tank

30‧‧‧Alkaline adjustment tank

40‧‧‧Desulfurization device

41‧‧‧Air intake pipe

42‧‧‧Exhaust line

50‧‧‧Generator

60‧‧‧ Thermostat

61‧‧‧Heat energy recovery pipeline

62‧‧‧Heating pipeline

70‧‧‧Trawl hydrolysis and acidification tank

71‧‧‧Waste liquid conveying pipeline

72‧‧‧Self-produced biogas delivery pipeline

73‧‧‧Overflow port

74‧‧‧Pump

80‧‧‧Methane fermentation tank

81‧‧‧ Mud drain

82‧‧‧Alkali liquid delivery pipeline

83‧‧‧Air collecting hood

84‧‧‧Overflow port

Claims (3)

A compound anaerobic trawling flow biological reaction system, comprising a trawling flow reactor, a waste liquid regulating tank, an alkaline regulating tank, a desulfurization device, a power generation device, and a thermostat; it is characterized in that the trawling flow reactor includes methane The fermentation tank and at least one trailing flow hydrolysis and acidification tank arranged in the methane fermentation tank; the methane fermentation tank has a sludge discharge tank, an alkali conveying pipeline, a gas collecting hood and an overflow port, and the sludge discharge tank is arranged below. The transport pipeline is connected with the alkaline regulating tank, the gas collecting hood is set above the opening, and the overflow port is set near the opening; the trailing flow hydrolysis acidification tank has a waste liquid transport pipeline, a self-produced biogas transport pipeline and an overflow Outlet, the waste liquid conveying pipeline is connected with the waste liquid regulating tank, the inlet of the self-produced biogas conveying pipeline is set above the inside of the methane fermentation tank, and the outlet is set at the bottom of the trailing flow hydrolysis acidification tank, and the self-produced biogas is transported The pipeline is provided with a pump, the overflow port is arranged above the trawling hydrolysis acidification tank, and the overflow port of the trawling hydrolysis acidification tank is higher than the overflow port of the aforementioned methane fermentation tank. According to the compound anaerobic drag flow biological reaction system described in item 1 of the scope of patent application, the inlet of the self-produced biogas conveying pipeline is higher than the overflow of the methane fermentation tank. According to the compound anaerobic trawl biological reaction system described in item 1 of the scope of patent application, the desulfurization device has an air inlet pipe and an air outlet pipe, the air inlet pipe is connected with the gas collecting hood, and the outlet The gas pipeline is connected with the power generation device, the thermostat has a heat energy recovery pipeline and a heating pipeline, the heat energy recovery pipeline is connected with the power generation device, and the heating pipeline is arranged around the tank body of the methane fermentation tank.

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