粪秆结构配比厌氧发酵中pH、VFA与产气效果的关系  

The Relationship Among pH,VFA and Biogas Production in Anaerobic Fermentation of Mixed Manure and Straw with Different Ratios

作　　者：张彤[1,2] 李伟[1,2] 李文静[1,2] 李轶冰[3,2] 杨改河[3,2] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]陕西省循环农业工程技术研究中心,陕西杨凌712100 [3]西北农林科技大学农学院,陕西杨凌712100

出　　处：《农业环境科学学报》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)

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.

关 键 词：小麦秸秆 鸡粪 厌氧发酵 PH值 挥发性脂肪酸 

分 类 号：S216.4[农业科学—农业机械化工程]