Temperature is an important external factor for the biogas fermentation. When the temperature is suitable, the bacteria will thrive and the activity will be strong. The anaerobic decomposition and the generation of methane will occur at a rapid rate, and the gas production will be more. In this sense, temperature is the key to good gas production. The low winter temperature is not conducive to the production of gas by biogas fermentation, so it is necessary to strengthen the winter management of the biogas tanks.
We usually divide the different fermentation temperatures into three ranges: 46-60°C as high-temperature fermentation, 28-38°C as medium-temperature fermentation, and 10-26°C as normal-temperature fermentation. When the fermentation temperature is below 8°C, only a small amount of biogas can be produced. Therefore, in the management of rural methane tanks, it is emphasized that the winter must be taken in winter to ensure normal gas production. Generally, there are the following points:
one. Warm up and promote decay. Non-solar energy design structure of the general biogas digester pool should use cover insulation, in the surface of the biogas digester covered straw, straw, straw, compost or thickening of soil and other insulation materials, the coverage is greater than the pool surface, to prevent the cold air into the pool temperature In the digester around the excavation of a good ring ditch, ditch piles of manure, the use of fermentation heat brewing; conditions can also build plastic shed insulation. During the refueling and feeding process, inject sewage with a temperature above 20°C, and prevent the inflow of external water to reduce the pool temperature.
two. Increase the concentration. Feeding in time to increase feed concentration to about 15%, and use fresh pig manure, fresh cow dung, fresh sheep manure etc. rich in nitrogen as fermentation raw materials, but can not use dry wheat straw, corn straw and other fiber fermentation raw materials , reduce the carbon-nitrogen ratio difference, accelerate the propagation of methane flora, and promote gas production.
three. Stir thoroughly. Under low temperature conditions in winter, biogas digesters are more likely to be crusted and stratified, so it is more necessary to strengthen mixing. Every 3-4 days, artificial stirring or biogas slurry reflux stirring, to avoid crusting, stratification, and promote gas production.
four. Pipeline maintenance. Condensation water is more likely to form in pipelines during low temperature conditions in winter, so it is necessary to observe the water collector frequently and find that condensed water should be removed in time to avoid clogging. As far as possible, pipes should be buried underground or covered with straw ropes, rags, and plastic film to prevent cracks. Air leaks, aged pipes, and joints must be promptly replaced.
Fives. Cracked pool wall. If the winter temperature suddenly drops, it will easily cause cracking of the pool wall, which will greatly damage the life of the winter gas and the life of the digester, and must be taken seriously. If cracks in the pool walls are found, they must be repaired. When repairs must be strictly in accordance with "Rural household methane tank management operating procedures" to empty the pool, the various safety measures in place after entering the pool and re-apply mortar. After entering the pool, first wash the residue in the pool with clean water, and then apply “one gray or two groats†or “two ash and three pulpsâ€. This will greatly increase the gas production and enhance the health and service life of the biogas digesters, which will be beneficial for long-term use. benefit.
six. It is generally not advisable to start a new pool in the winter. If it is difficult to ferment in winter, if it is forced to start a new pond in the winter, the effect of gas production is not good, which will have an adverse effect on the long-term use of the digester. Similarly, it is not appropriate to make large refueling in the winter. However, it must be noted that the biogas digester is strictly prohibited for the winter season. The old pool can generally take out two-thirds of the feed solution for winter fertilization before adding it to the winter, and then add one-third of the fresh raw materials to play a role in the fermentation of the pool to increase the temperature and moisture. The new pond should be stuffed with straw and weeds for fermentation to prevent freezing of the pool, and the stacking material should be removed at the start of next year. Although there is no obvious gas production in the unactivated new pool, the underground methane tank is actually in semi-production, and the air pipe should be dialed down to prevent the slow production of gas in the winter to swell the pool or to cause serious safety hazards due to leakage of biogas.
The management of biogas digesters in winter is focused on the meticulous maintenance of managers, and they cannot be left to be natural, so as to eliminate the adverse effects brought about by low temperature in winter to a certain extent, and to ensure that biogas digesters can successfully overwinter and provide long-term benefits.
We usually divide the different fermentation temperatures into three ranges: 46-60°C as high-temperature fermentation, 28-38°C as medium-temperature fermentation, and 10-26°C as normal-temperature fermentation. When the fermentation temperature is below 8°C, only a small amount of biogas can be produced. Therefore, in the management of rural methane tanks, it is emphasized that the winter must be taken in winter to ensure normal gas production. Generally, there are the following points:
one. Warm up and promote decay. Non-solar energy design structure of the general biogas digester pool should use cover insulation, in the surface of the biogas digester covered straw, straw, straw, compost or thickening of soil and other insulation materials, the coverage is greater than the pool surface, to prevent the cold air into the pool temperature In the digester around the excavation of a good ring ditch, ditch piles of manure, the use of fermentation heat brewing; conditions can also build plastic shed insulation. During the refueling and feeding process, inject sewage with a temperature above 20°C, and prevent the inflow of external water to reduce the pool temperature.
two. Increase the concentration. Feeding in time to increase feed concentration to about 15%, and use fresh pig manure, fresh cow dung, fresh sheep manure etc. rich in nitrogen as fermentation raw materials, but can not use dry wheat straw, corn straw and other fiber fermentation raw materials , reduce the carbon-nitrogen ratio difference, accelerate the propagation of methane flora, and promote gas production.
three. Stir thoroughly. Under low temperature conditions in winter, biogas digesters are more likely to be crusted and stratified, so it is more necessary to strengthen mixing. Every 3-4 days, artificial stirring or biogas slurry reflux stirring, to avoid crusting, stratification, and promote gas production.
four. Pipeline maintenance. Condensation water is more likely to form in pipelines during low temperature conditions in winter, so it is necessary to observe the water collector frequently and find that condensed water should be removed in time to avoid clogging. As far as possible, pipes should be buried underground or covered with straw ropes, rags, and plastic film to prevent cracks. Air leaks, aged pipes, and joints must be promptly replaced.
Fives. Cracked pool wall. If the winter temperature suddenly drops, it will easily cause cracking of the pool wall, which will greatly damage the life of the winter gas and the life of the digester, and must be taken seriously. If cracks in the pool walls are found, they must be repaired. When repairs must be strictly in accordance with "Rural household methane tank management operating procedures" to empty the pool, the various safety measures in place after entering the pool and re-apply mortar. After entering the pool, first wash the residue in the pool with clean water, and then apply “one gray or two groats†or “two ash and three pulpsâ€. This will greatly increase the gas production and enhance the health and service life of the biogas digesters, which will be beneficial for long-term use. benefit.
six. It is generally not advisable to start a new pool in the winter. If it is difficult to ferment in winter, if it is forced to start a new pond in the winter, the effect of gas production is not good, which will have an adverse effect on the long-term use of the digester. Similarly, it is not appropriate to make large refueling in the winter. However, it must be noted that the biogas digester is strictly prohibited for the winter season. The old pool can generally take out two-thirds of the feed solution for winter fertilization before adding it to the winter, and then add one-third of the fresh raw materials to play a role in the fermentation of the pool to increase the temperature and moisture. The new pond should be stuffed with straw and weeds for fermentation to prevent freezing of the pool, and the stacking material should be removed at the start of next year. Although there is no obvious gas production in the unactivated new pool, the underground methane tank is actually in semi-production, and the air pipe should be dialed down to prevent the slow production of gas in the winter to swell the pool or to cause serious safety hazards due to leakage of biogas.
The management of biogas digesters in winter is focused on the meticulous maintenance of managers, and they cannot be left to be natural, so as to eliminate the adverse effects brought about by low temperature in winter to a certain extent, and to ensure that biogas digesters can successfully overwinter and provide long-term benefits.