摘要
为探索发酵原料产气量与pH值、挥发性脂肪酸之间的关系,确定最佳原料配比以及发酵温度是关键。通过试验在恒温条件下以不同配比的鸡粪、麦秆混合物为原料,在25～40℃范围内进行厌氧发酵,研究pH值和挥发性脂肪酸对沼气产量的影响。结果显示,在约50d的发酵过程中,以40℃、鸡粪和麦秸3∶1处理的(简称鸡麦3∶1)累积产气量最高,达11492mL,25℃、鸡麦3∶1处理的累积产气量最低,为6227mL。在25、30℃发酵条件下,随着麦秆比例的增加,产气量逐渐增加;在35、40℃发酵条件下,随着麦秆比例的减少,产气量逐渐增加。pH值与日产气量成正比,而挥发性脂肪酸与日产气量成反比。
The key of the research is to study the relationship of gas production with pH and VFA,and to determine the optimal fermentation temperature and material ratio. This experiment was conducted at 25 ℃～40 ℃ and different mixed ratios of chicken manure and wheat straw was used as materials,aiming at studying the pH and VFA on biogas production. The results showed that,cumulative biogas production of chicken manure mixed with wheat straw 3∶1 was the highest in 40 ℃; yield up to 11 492 mL,while lowest in 25 ℃,only to 6 227 mL. With the increase in the ratio of wheat straw,gas production increased gradually in 25 ℃ and 30 ℃,but gradually decreased in 35 ℃ and 40 ℃ during 50 d anaerobic digestion. The average daily biogas production was directly proportional with pH and inversely proportional with VFA.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2010年第12期2425-2430,共6页
Journal of Agro-Environment Science
基金
国家自然科学基金(30700482)
陕西省13115科技创新工程重大科技专项(2009ZDKG-03)
陕西省13115科技创新工程重大科技专项(2009ZDKG-06)
西北农林科技大学基本科研业务费青年基金(QN2009006)
西北农林科技大学基本科研业务费青年基金(QN2009003)
关键词
小麦秸秆
鸡粪
厌氧发酵
PH值
挥发性脂肪酸
wheat straw
chicken manure
anaerobic digestion
pH
volatile fatty acids
