The Study Of Anaerobic Fermentation Efficiency Of Cow And Chicken Manure In Different Temperature

The quantity and magnitude of livestock production hanve developed rapidly in recent years.Abundant animal products consisting of meet, egg and milk are supplied by animal productionmeanwhile the quantity of animal waste consisting of manure and padding increases in much agreat scale and accumulated around animal farm and village. The amount of the animal wastepollute farm and village environment severely. The rate of animal waste production exceeds the rateof natural degradation of it. Anaerobic treatment of animal manure not only decreased environmentcontamination, but also generate a clean energy called biogas in the form of methane. Accordinglyanaerobic treatment of animal manure for decreasing environment contamination is significance.This research was conducted according to C:N of cow and chicken manure at 25℃and 30℃and 35℃. Because anaerobic digestion of chicken manure is to be inhibited by low temperature, sothat it is important to elect suit ratio between cow and chicken manure at midst and lowtermperature, offeing parameter to high efficiency anaerobic digestion of cow and chicken manure,and lighten the pollution of livestock and poultry excrement.Studies on efficiency of anaerobic treatment of cow and chicken manure of whichconcentration is 5.5% simulated monophase anaerobic fermentation at 25℃, 30℃and 35℃. Theresults as follow:(1) The time spended on reaching the lowest point of pH values advanced and increasedamount of pH values increased with with the increment of temperature according to the ratio 0:1,1:1, 2:1 and 1:0 between cow and chicken manure at 25℃, 30℃and 35℃. pH values tended to bedroping all the time, and it is not fit for anaerobic digestion system of pure chicken manure tooperate when pH values is under 6.0, while the ratio 1:1 and 2:1 between cow and chicken manurewould be operateed.(2) Biogas production of anaerobic digestion with the ratio 1:1 and 2:1 between cow andchicken manure were more than that of pure chicken and cow manure at 25℃, 30℃and 35℃.Biogas production of anaerobic digestion increased significantly with the ratio 1:1 and 2:1 at 25℃and 30℃, the same with the ratio 1:1 at 35℃. The time spended on reaching the highest pointshortened and biogas production of anaerobic digestion increased with the increment oftemperature.(3) TCOD removal rate of the treatment with the ratio 0:1, 1:1, 2:t and 1:0 between betweencow and chicken manure was increased with the increament of temperature at 25℃and 30℃and 35℃. TCOD removal rate was the most from 25℃to 30℃, and was lower from 30℃to 25℃, andincreased with increment of cow manure adding into chicken2. Experiments of anaerobicfermentation on cow and chicken manure at 30℃.(4) One of the key facters influence the metabolism multiplication of anaerobic is temperature,the other is nutritional ingredient of substrate. The number of anaerobic microbes of the tratmentwith the ratio 0:1 and 1:1 and 2:1 and 1:0 between cow and chicken manure increased with theincreament of temperature at 25℃, 30℃and 35℃, and increased with increment of cow manureadding into chicken. Increased amount of the number of anaerobic microbes from 25℃to 30℃wasless than from 30℃to 35℃.(5) The higher temperature is, the better digestion efficiency. But there was no significantdifference between 30℃and 35℃, and 30℃is better in order to save resource.(6) The anaerobic digestion system of pure chicken manure without adding cow manure withthe ratio 1:1 and 2:1 between cow and chicken manure,could run, and the ratio 1:2 is more suitableat 25℃and 30℃and 35℃.