Effects Of Three Ventilation Conditions On The Metabolism Of Microbes In High-temperature Compost In The Qinghai-Tibet Plateau

A new pattern of high-temperature compost ventilated by pipes has been applied in static composting systems, for its significant effect on increased temperature and rate in the Qinghai-Tibet Plateau of China.However, the effective method for high temperature remains to be settled. Three treatments were evaluated:(1) turning the manure; (2) embedding 9 pipes; (3) embedding 15 pipes. Temperature, oxygen, methane, dissolved organic carbon and P-D-glucosidase and other parameters related to composting were detected. Then to analyses the changes of those parameters and have a better understanding of the high temperature compost. Main results as follows:In turning the manure, embedding 9 pipes, pipes embedded under 15 conditions, compost reached above 50 ℃ for about:21 days,33 days,14 days, and embedding 15 pipes compost earliest started the high-temperature phase.In 70 days Compost, in the early stage, oxygen consumption rate is the fastest. The surface’ oxygen consumption rate is less than the center. The center oxygen concentration is the first reached 20%, which means that the central is the first for reaching maturity. Embedding 15 pipes, compared with embedding 9 pipes, turning the manure oxygen exchange effect is remarkable. In the early and mid stage, embedding 9 pipes compared with turning the manure have no significant difference while in the medium-term and in the latter part show significant difference.Under 0-20 cm、20-60 cm、60-100 cm of the compost, dissolved organic carbon in embedding 15 pipes has shown a continuous upward trend, while in the conditions of embedding 9 pipes and turning the manure have shown first increased and then decreased. And embedding 15 pipes treatment 0-20 cm,20-60 cm,60-100 cm, the dissolved organic carbon accumulation eventually were:177.9 mg·kg-1,271.0 mg·kg-1,241.0 mg·kg-1, they are larger than the other two the corresponding values under ventilated conditions. In conclusion, embedding 15 pipes that the pipe density is 0.373 per pipe in every cubic meter, you can increase the amount of accumulation of dissolved organic carbon.Under embedding 15 ventilation pipes conditions, the amount of β-D-glucosidase and composting conditions compared to the other two remain substantially maximum. Only when 60-100cm, in the high temperature phases β-D-glucosidase of slightly less than embedding 9 ventilation pipes composting process. The result shows that embedding 15 ventilation pipes throughout the compost, microbial secretion of β-D-glucosidase most abundant in the ventilation pipe embedding 15 pipes conditions and more and more β-D-glucosidase involved in the transformation process of organic matter.In conclusion, embedding 15 ventilation pipes condition is more effective than the other two ventilation treatments, so that the oxygen content is higher than the other two treatment conditions. Furthermore, microbial respiration approach to be aerobic respiration, causing embedding 15 ventilation pipes composting process efficient in pre-heating; The maximum amount of air exchange, thereby inhibiting the microbial anaerobic metabolism and reducing methane emissions; High oxygen content, increase the synthesis of microbial metabolism of β-D-glucosidase and secretion; In addition, a large amount of dissolved organic carbon in can increase efficiency of the organic fertilizer. Thus described, embedding 9 and 15 ventilation pipes compared with turning the manure weekly can better achieve alpine region of high temperature composting poultry manure, and embedding 15 ventilation pipes is better than burying 9 ventilation pipes. The density of the pipe in Embedding 15 ventilation pipes compost is 0.373 per pipe in every cubic meter.