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High-turbulivity small wet anaerobic digestion reactor and operation control method

An anaerobic digestion and reactor technology, which is applied in biochemical equipment and methods, gas production bioreactors, bioreactor/fermenter combinations, etc. Problems such as low degradation rate of organic matter, to achieve the effect of accelerating fluid flow rate, high degradation rate of organic matter, and good degree of homogenization

Active Publication Date: 2021-11-05
天津市农业科学院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the different technical aspects of the anaerobic digester tank type, stirring method, heating method, etc., it is divided into various forms, but almost all reactors have not done in-depth research on the internal reactant flow state, and there are poor flow state homogeneity, There is no mass transfer or even a dead zone in each local part, which leads to low organic matter degradation rate and low methane content in the whole process, resulting in large and thick scum and foam, which increases the working pressure of slag removal
In addition, for small-scale anaerobic digestion projects, there are many professional heating and stirring equipment such as heat exchangers, boilers, and mechanical stirrers, the process is complicated, and the energy consumption is high. It is not suitable for small-scale users such as farmers. Reactor form

Method used

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  • High-turbulivity small wet anaerobic digestion reactor and operation control method

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Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 shown ( figure 1 The specific wiring of each monitor sensor wire and stirring air pipe is omitted), the main body of the reactor is an integrated structure formed by connecting a cylinder 1 with an equal-diameter conical top 2 and a conical bottom 3, placed vertically, and conical The ratio of height to diameter of top 2, cylinder 1, and conical bottom 3 is 5:20:2:20. The liquid level shall be at least 0.3m from the horizontal plane where the cylinder meets the conical top. A slag outlet 4 is opened at the tip of the conical bottom, which is opened and closed by a slag discharge solenoid valve 5 .

[0047] The conical top is equipped with an overpressure safety valve 6, a vacuum safety valve 7, and a gas pressure gauge 8. The top of the cone is provided with two viewing ports 9, which are located at symmetrical positions on the same diameter. Conical top opens a round hole, as feed inlet 10, connects vertical feed standpipe with screw thread, and st...

Embodiment 2

[0052] run method

[0053] (1) Medium-temperature digestion, the temperature is controlled at about 35°C, cycle operation, intermittent feeding and liquid discharge, 25-30 days per cycle.

[0054] (2) The control method of the physical and chemical characteristics of the feed: control the physical and chemical properties and components of the feed, in which the moisture content is controlled at 93%~98%, the inorganic particles are removed, the fiber length is not greater than 4 cm, and the oil content of the feed should not be greater than 15%. The carbon-to-nitrogen ratio is between 10 and 50. When the dry plant straw content exceeds 50% of the total amount of the feed mixture (by mass), the mixture must be pre-stacked with water.

[0055] (3) Start-up method of anaerobic flora cultivation: add 20% of raw material mixture and 80% of domestic sewage (by volume) for the first feed, and no inoculum may be added. At the end of the first cycle, about 1 / 3 of the effective volume o...

Embodiment 3

[0060] An anaerobic digestion project in an agricultural park in Tianjin built a reactor according to this patented method, with a total height of 1.6 meters and a diameter of 2 meters. The raw material for digestion is a mixture of activated sludge, plant straw, and pig farm manure, accounting for about 68%, 12% and 20% (by mass) respectively. The comprehensive moisture content of the mixture is 96%, and the carbon-nitrogen ratio is about 27% ︰1. Plant stalks are rolled and cut to less than 4 cm.

[0061] See Table 1 for the control methods in the start-up phase. By the end of the fourth cycle, the methane content of the biogas will reach 65%, and the gas production will be 700L / kg dry weight. Table 1

[0062]

[0063] After successful startup, it enters the stable operation stage. During stable operation, each digestion takes 30 days. The median temperature is set to 35°C, and when the temperature difference exceeds 2°C, the heating device will be triggered to start ...

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Abstract

The invention discloses a high-turbulivity small wet anaerobic digestion reactor and an operation control method. The high-turbulivity small wet anaerobic digestion reactor is characterized in that a reactor main body is of an integrated structure formed by connecting a cylinder with an equal-diameter conical top and a conical bottom up and down, and a feeding system, a liquid outlet and slag discharge system, a gas circulation stirring system, a heating and heat preservation system, an online monitoring system, an observation port, a safety valve and a barometer are attached to the reactor main body. Experimental results show that by adopting the high-turbulivity small wet anaerobic digestion reactor and the operation control method, high-turbulence flow state in the reactor can be realized, the reactor is in a homogenized benign state within 100% of time, the thickness of scum in each period is 30-40% of that of scum in other anaerobic reactors, the final volatile solid degradation rate reaches 60-70%, and the methane concentration of biogas reaches 60-80%.

Description

technical field [0001] The invention belongs to the technical field of wet anaerobic digestion of organic matter, and in particular relates to a brand-new flow state turbulent reactor and an operation control method of each link thereof. Background technique [0002] As a common and mature organic matter treatment process, anaerobic digestion technology is widely used in the resource treatment of activated sludge, kitchen waste, human and livestock manure, high-concentration organic sewage, plant straw, and farmland vegetables. Oxygen fermentation technology, anaerobic fermentation has low energy consumption and strong resource recycling characteristics, which are the current development hotspots. [0003] According to the different technical aspects of the anaerobic digester tank type, stirring method, heating method, etc., it is divided into various forms, but almost all reactors have not done in-depth research on the internal reactant flow state, and there are poor flow s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/38C12M1/36C12M1/34C12M1/107C12M1/04C12M1/02C12M1/00C12P5/02C02F11/04C02F103/20
CPCC12M21/04C12M23/02C12M23/36C12M29/06C12M41/22C12M41/26C12M41/28C12M41/40C12M41/44C12M41/48C12P5/023C02F11/04C02F2103/20Y02E50/30
Inventor 钱姗吴迪
Owner 天津市农业科学院
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