摘要
将污泥与餐厨垃圾联合厌氧发酵产氢余物进一步产甲烷,产甲烷量比污泥与餐厨垃圾单独或直接联合厌氧发酵产甲烷大。研究污泥与餐厨垃圾联合厌氧发酵产氢余物产甲烷过程中产甲烷量与底物指标变化的关系,实验结果表明,整个消化过程中,累积产甲烷量为613 L,最大产气速率和产甲烷速率分别为2.12 L/(kg·d)和1.46 L/(kg·d),最大甲烷含量为72.5%,消化系统的p H在总挥发性脂肪酸(TVFA)以及氨氮、CO2-3和HCO-3等碱度的共同作用下基本维持在适宜产甲烷的范围内,在不同的消化阶段,厌氧发酵产甲烷过程起主要作用的物质不同,先后顺序依次为糖类、蛋白质和TVFA,并且累积产甲烷量与COD、总糖、总蛋白质的显著相关性大小依次为:COD>总糖>总蛋白质,COD去除率高达79.54%。
Methane production from residue of anaerobically fermentative hydrogen production using combined sludge and food waste has higher yield than using sludge or food waste alone,or directly using combined substrate of sludge and food waste. The relationships between methane yield and the changes of substrate indices were studied. The results showed that,during the whole digestion process,the accumulative methane yield was613 L,and the maximum rate of gas production and methane production was 2. 12 L /( kg·d) and 1. 46 L /( kg·d),respectively,and the maximum methane content was 72. 5%. The p H of the digestion system could be maintained within the suitable range for methane production under the mutual adjustment of total volatile fatty( TVFA) and alkalinity( including ammonia nitrogen,CO2-3and HCO-3). Different substrates played different roles during different stages of anaerobic digestion,and the total saccharide played the major role at the beginning of digestion,while the total protein at the midterm phase,and then TVFA. Moreover,it was also found that the significant correlations between accumulative methane yield and COD,total saccharide,and total protein,were COD> total saccharide > total protein,and the removal rate of COD was up to 79. 54%.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第1期425-430,共6页
Chinese Journal of Environmental Engineering
基金
福建省科学基金资助项目(2013J01035)
福建省教育厅B类项目(JB12045
JB13029)
关键词
污泥
餐厨垃圾
产氢余物
产甲烷
底物指标
excessing sludge
food waste
residue of fermentative hydrogen production
methane produc-tion
substrate indices
