Household biogas digesters in rural areas of the use of technology

Study:

Abstract The use of household biogas digesters in rural Technology, including biogas digesters daily management, winter management, and problems with use of the process, made use of attention, that of rural households use gas with methane pool reference.

Keywords: rural household biogas digesters; daily management; use of Technology

In recent years through the implementation of the biogas project, the current state of rural biogas Bo faster pace of development, the use of biogas digesters cover a wide area, effectively promoting the Bole of rural economic development and improvement of living standards, has significant economic, ecological and social benefits. But now the Xinjiang Uygur Autonomous Region Bole digester process requires the use of well-maintained, to promote rural biogas project smoothly, now the daily management digesters are presented below.

1, the daily management of biogas digesters
(1) digester start-up time. According to Bole climate change, the new digesters should be chosen to start in late May to mid-September season of high temperatures, in order to facilitate rapid digester gas production.

(2) people, livestock, poultry manure fermented in the tank outside the reactor steep, covered with plastic film to enhance the feed temperature, compost heap mixed with 3% to 5% of the fermented liquid, add liquid pool volume accounts for 1 / 4, 1 month gas production rate is the most productive stage of the fermentation of raw materials consumed more; the first 2 months is the gas production rate began to decline in the stage of decomposition slowed down; the first 3 months was significantly decreased rate of methane gas phase, Therefore, the digesters to add new material, generally in peak gas production rate did not decline before the accession, that is, after starting 20d, no later than 30d. get rid of the old material, and out of every 5 ~ 10d 1 material, breeding households according to their own needs, one feeding around 70kg, animal feces into the fermentation tank, coupled with human waste into the fermentation tank to meet the needs of [1,2]. digesters should spare no materials, handling the material, first-out material, backward material, increase the number expected, a number of materials.

(3) adjust the feed solution pH. Redeployment liquid frequently check the pH of the fermentation liquid, adjust the feed solution pH (normal range 6.8 ~ 7.5). If acidic liquid from the mouth of the feed by adding the right amount of plant ash and ammonia or clarify the lime and other alkaline substances, and spoon with a long reach into the feed port dung stir forth, but the use of lime (clarification) of the amount can not be too much. such as fermentation liquid slightly alkaline, the amount of vinegar should be added and warm water mixed together, but can not add vinegar directly to the pool, so easy to kill the methane bacteria.

(4) control the concentration of fermentation of raw materials. Biogas plants suitable concentration is generally 6% to 10% in the summer of concentration should be controlled within 6% to 8% in winter and spring should be controlled in the concentration of 8% to 10%.

(5) mixing the fermentation of raw materials. Digester fermentation of raw materials are often mixed, so that the fermentation tanks and bacteria distribution of raw materials, full access to methane bacteria fermentation of raw materials.

2 digesters winter management
(1) for feeding time. Refueling time is generally in the winter before, digesters 1 to complete the refueling, mid-September or October with greenhouse refueling with basal feed, in large refueling stop feeding before the 20d , "four in one" mode into the mode outside the reactor to retting.

(2) an ample supply of new raw materials. Refueling difficult to digest when you clear the bottom residue or deposition of sediment and other debris inside the digester to maintain the 20% to 30% of the methane bacteria containing activated sludge and liquid as inoculum, great for cold seasons, do not feed, when the pool temperature below 10 �� temperature change can not be big materials (digesters difficult to start because of low temperature) [3,4].

(3) "Four in One" model animal building to the south roof and greenhouse plastic film covering the same period. "Trinity" model, but also in the south before winter roof covering plastic film for heat storage in advance, a corresponding increase in pool temperature. Non-Trinity, four one, four with the digesters into, a gate to be stamped, and in an area larger than the cell body with a plastic cover on top, top, stacking firewood or pile casing retting fermentation of raw materials, the cold, the thickness is greater than 30cm.

Links to Research Papers Download http://www.hi138.com 3 Note the use of biogas digesters
(1) gas pool in the process of using the pool, if we find the pointer on the barometer in the opposite direction to the inlet direction, that appears negative pressure, indicating leakage digesters; If the pointer moves to stop or move to a certain height is no longer change, that is leakage or minor leak digesters.

(2) in the course to begin gas production well, then the pointer barometer suddenly decreased or no gas was mainly attributable to a switch or loose joints leaking gas pipeline road, or Gas Pipeline Road, cracking, or biogas pool appears Zhanglie, air and water leakage, or the pool may be added pesticides and other toxic substances, inhibit or kill the methane bacteria.

(3) look at the cover of the water is bubbling activity, respectively, on the pond and the gas system pressure test, test gas, check to see whether the pool leak, leak. If the renovation will have to find the leak Department, pumping part or most of the old material off, time to add fresh ingredients.

(4) pressure gauge pointer is high, but very little methane storage. Pressure gauge pointer to the location of high and low, the gas pressure is a measure of the size of digesters, tanks do not fully explain the amount of methane content in biogas. Because methane is a kinds of mixed gas, biogas digesters because there are a lot of water inside from flowing into the feed opening, the biogas fermentation liquid in or too much, resulting in gas tank volume is too small. When the gas is generated, pressure tanks, pressure gauge on the Pointer soon rise, but the amount of stored gas is not much. Therefore, in use, the rapid decline in gas tanks, the pointer on the gauge dropped quickly, with gas soon after the gas tanks run out, so the pressure Room (or the material between) the volume of hours, should increase the inoculum, so that the methane gas in the growth of bacteria up soon.

(5) in the course of the winter, when the gas when the switch is opened, the pointer on the barometer up and down, the reason is the condensation of water within the pipeline road, this phenomenon occur more frequently in winter. Should be let go pipelines Road the condensation water, and the lowest position in the pipeline to install product bottles,
(6) should always observe the pointer on the barometer, when the barometer pointer on the pressure of 1 to 6 range, to begin the fermentation of raw materials into new, remove the old fermentation of raw materials, the amount of material taken into the number of expected number of . the normal range of use of pressure control in the pressure range of 7 to 9, if the pressure more than 10 to 12, will have to quickly use the gas, or from the airway at the gas valve let go, to avoid negative pressure, Splitting gas tank.

4 References
[1] Yan Shaoying. Efficient use of biogas Technology in rural areas [J]. Jilin Agriculture, 2009 (9) :18-19.

[2] Liang Wenzhe. Day to day management and use of biogas Technology [J]. Hebei Agricultural Science and Technology, 2007 (11) :46-47.

[3] Bai Li, Shi Yan, Shu Qi child. Biogas in northern China using the technology of the winter [J]. Changchun University of Technology, 2007 (7) :177-181.

[4] Zhao Qiong cents. Digesters frozen by the management and use of technology [J]. Yunnan Forestry, 2008 (5): 35.

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