Evaluation of composting effect of cold-adapted bacterial agent combined with ultra-high temperature bacterial agent at low temperature
To solve the problems of difficult temperature rise and low degree of rotting in compost products during maize straw composting under low-temperature conditions,this experiment screened 3 strains from mixed samples of soil and maize straw under the perennial accumulation of maize stalks at 10℃to establish a cold-adapted bacterial agent,which was combined with an existing ultra-high temperature(≥50℃)bacterial agent for composting maize stalks under low-temperature conditions.The functions of two kinds of bacterial agents in the composting process were explore and a composting method was finally established for the combined application of a cold-adapted bacterial agent and an ultra-high temperature bacterial agent at low temperature.The results showed that the temperature rise effects of the 3 groups without adding bacterial agent(CK),a single inoculation of the cold-adapted bacterial agent(T1)and a single inoculation of the ultra-high temperature bacterial agent(T2)were unfavorable,and the maximum temperature could only reach approximately 50℃.The 3 groups had the cold-adapted bacterial agent added on day 0,and the ultra-high temperature bacterial agent was added on days 0(T3),2(T4),and 4(T5),respectively.This not only increased the temperature rapidly in the early stage of composting,but also made the pile temperature reach 79.0,80.3℃and 78.6℃on days 5,6,and 7,respectively.In addition,the total organic carbon degradation rate and seed germination rate of T3,T4,and T5 groups were higher than those of the CK,T1,and T2 groups.Compared with the T5 group,the temperature rise of the T3 group was smoother,which is related to the adaptation process of ultra-high temperature bacterial agent in the pile.Our results indicated that the composting effect of the combined application of a cold-adapted bacterial agent and an ultra-high temperature bacterial agent was significantly improved under low-temperature conditions and that the composting could be completed in 25 days.Under the premise of adding a cold-adapted bacterial agent at the beginning of composting,the earlier the addition time of the ultra-high temperature bacterial agent,the smoother its function in the pile with a superior composting effect.
low temperaturecold-adapted bacterial agentultra-high temperature bacterial agentmaize strawaerobic composting
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