A kind of method that improves gas production rate of marsh gas fermentation raw material
Technical field:
The invention belongs to agriculture new forms of energy, environmental technology field, especially a kind of method that improves gas production rate of marsh gas fermentation raw material with the plant-sourced inoculum.
Background technology:
Rural methane facilities development is an important component part of national energy development strategy, and biogas is one of four big emphasis renewable energy sources of greatly developing at present of China.Accelerate development the rural area clean energy, continuing increases the rural methane facilities development input, supports place with good conditionsi to carry out the big-and-middle-sized biogas construction of plant.Accelerate to implement village clean project, advance the comprehensive regulation and the trans-utilization of human and animal excreta, agricultural crop straw, domestic refuse and sewage.
Because river pollution aggravation in recent years, body eutrophication have surpassed natural pin and have received the limit, lake big area blue-green algae and the southeastern coast red tide incident that takes place frequently has appearred, and Herba Eichhorniae overflows.The fecundity of Herba Eichhorniae is extremely strong, based on vegetative propagation, and the expansion of Herba Eichhorniae rapid spread, from the angle of science, body eutrophication does not add utilization again to Herba Eichhorniae and causes stubble secondary pollution accumulation and rivers to silt up.
The marsh gas fermentation pool in existing rural area is built in ground usually, fermentation raw material such as stalk, domestic waste and human and animal excreta etc., and wherein human and animal excreta is a fermentation raw material, also is starter.
Because existing marsh gas fermentation pool is built in ground usually, thereby the fermentation gas rate is subjected to the variation of temperature and changes, in brief, summer, methane-generating pit substantially can fermentation gas, and winter, the north methane pond at all can not fermentation gas, even methane-generating pit have by bursting by freezing, although in summer, because existing marsh gas fermentation pool relies on the human and animal excreta that drops into to ferment, fermentation gas rate and gas production rate are on the low side, have a strong impact on the economic benefit of biogas engineering.
Summary of the invention:
The objective of the invention is to provides a kind of method that can improve gas production rate of marsh gas fermentation raw material at existing methane tank gas production rate and gas production rate this situation on the low side.
The present invention, comprise: preparation plant-sourced inoculum: the raw material of plant-sourced inoculum comprises Herba Eichhorniae butt, EM bacterium and natural pond liquid, its weight proportion is 15-20: 0.5-1.2: 78.5-84.2, wherein, the Herba Eichhorniae butt from the Herba Eichhorniae of salvaging rivers through chopping, dry gained, its water content 5-10%; Getting fermentation pond liquid heats to 23 ℃-25 ℃, pouring the EM bacterium into mixes thoroughly, drop into the Herba Eichhorniae butt, in 23 ℃-25 ℃ environment, soaked 24 hours, get the plant-sourced inoculum, then plant-sourced inoculum and fermentation raw material are dropped in the marsh gas fermentation pool in the lump, input amount is: fermentation raw material: the plant-sourced inoculum is 100: 0.5-2; The temperature of marsh gas fermentation pool is more than or equal to 23 ℃, but can not surpass 55 ℃, otherwise bacterial classification is killed, and fermentation stops.
The present invention, the temperature of described marsh gas fermentation pool will keep more than or equal to 23 ℃, if methane-generating pit is built in ground routinely, can reach this temperature summer, and the early spring or late autumn weather, one of method is an external heat source, to guarantee to reach this temperature; Two of method is that marsh gas fermentation pool is built in the dark underground environment of 6-10 rice, and is the domes that Steel Concrete is built.At the dark underground construction marsh gas fermentation pool of 6-10 rice, directly utilize underground heat to provide heat energy for marsh gas fermentation pool, it is possible that marsh gas fermentation pool is kept more than or equal to 23 ℃.In addition, adopt Steel Concrete that marsh gas fermentation pool is built up domes, can make marsh gas fermentation pool firmer, more durable.At the dark underground construction marsh gas fermentation pool of 6-10 rice,, calculate for the economic benefit (being input-output ratio) of biogas engineering though laid down cost is higher.
The present invention, utilize the Herba Eichhorniae butt, add the EM bacterium, be made into the plant-sourced inoculum with natural pond liquid, the one, Herba Eichhorniae contains very abundant cellulosic, protein, amino acid, carotene and trace element, the breeding fast growth, and the 2nd, utilize the zymotic efficiency of the prolific microbial bacteria of EM bacterium, thereby quickened organic decomposition, made the biogas fermentation raw material improve the factor of created gase 3-5 of unit doubly.Like this, both improve the utilization ratio of biogas and methane-generating pit, also improved the economic benefit of biogas engineering, helped developing the biogas construction.
The present invention both had been adapted to medium-and-large-sized feeding live pig plant and had used, and also was adapted to handle densely populated public lavatory, town and country discharging human faecal mass sewage.
Description of drawings:
Fig. 1 is the structure principle chart of embodiment marsh gas fermentation pool.
Among the figure, 1, charging pond 2, inoculating groove 3, feed-pipe 4, fermentation vat 5, discharge nozzle 6, material-output tank 7, finishing plant.
Embodiment:
A kind of method that improves gas production rate of marsh gas fermentation raw material, comprise: preparation plant-sourced inoculum: the raw material weight proportioning of plant-sourced inoculum is Herba Eichhorniae butt 18kg, EM bacterium 1.0kg, natural pond liquid 81kg, the Herba Eichhorniae butt from the Herba Eichhorniae of salvaging rivers through chopping, dry gained, its water content 5-10%; The EM bacterium is adopted sky, Henan justice bio tech ltd product supplied; Measuring fermentation vat natural pond liquid by prescription heats to 23 ℃-25 ℃, pouring the EM bacterium into mixes thoroughly, drop into the Herba Eichhorniae butt, in 23 ℃-25 ℃ inoculation pond 2, soaked 24 hours, get the plant-sourced inoculum, then, plant-sourced inoculum and fermentation raw material are put in the marsh gas fermentation pool 4 by the pond 1 that feeds intake in the lump, input amount is: every 100kg fermentation raw material is joined plant-sourced inoculum 1kg; Marsh gas fermentation pool 4 is chosen three grades of domes that placed in-line Steel Concrete is built that are built in the dark underground environment of 6-10 rice.Because marsh gas fermentation pool is built in dark underground of 6-10 rice, utilizes underground heat to provide heat energy for marsh gas fermentation pool, make marsh gas fermentation pool keep leavening temperature more than 25 ℃ throughout the year.
Present embodiment, every cubic metre methane tank gas production rate can reach 0.68m
3/ day (m
3/ d), the chemical reaction velocity of plant-sourced can increase 2-3 doubly.
Present embodiment, marsh gas fermentation pool is built the dark underground environment of 6-10 rice in, adopt Steel Concrete to build three grades of conjuncted fermentation vats of arch, symmetrical two ends in conjuncted fermentation vat, find out the drop point, the above input and output material plastic conduit of two diameter 30cm is installed,, is established charging pond 1, inoculating groove 2, material-output tank 6 and finishing plant 7 to apart from about 1-2 rice, ground.
Present embodiment, plant-sourced inoculation fermentation technology adopts underground device, makes feed-pipe 3 with the plastics tubing that diameter 30cm is above, guarantees inoculation material and the unimpeded fermentation vat 4 that enters of fermentation raw material; Keep the leavening temperature more than 25 ℃ throughout the year, principle, safe fortune, the aerogenesis of utilization nature drop, equivalent transposition, do not explode, do not crust, automatic sludge discharge, layout flexibly, save the area.
By discharge nozzle 5 sucking-offs, for the usefulness that finishing plant is made fertilizer, the natural pond liquid of failing to utilize enters the biological treatment tank purifying treatment with slush pump for settled natural pond slag and natural pond liquid in the present embodiment, tail level fermentation vat.