针铁矿对城市生活垃圾有机组分厌氧发酵的影响

Influence of Goethite on Anaerobic Fermentation of Organic Fraction of Municipal Solid Waste(OFMSW)

利用PVC管构建厌氧发酵反应器,研究了铁氧化物对有机垃圾厌氧发酵过程中产气及垃圾渗滤液特性的影响.结果表明,添加针铁矿能够促进垃圾的水解酸化效率和产气速率,提高产气量至163.4 L,较空白提高了20%.通过对厌氧消化中间产物Fe2+、NH+4-N、NO-3-N、COD以及有机酸的分析表明,铁氧化物的存在有利于降低系统氧化还原电位,有助于提高厌氧微生物的水解酸化效率;铁氧化物的加入能够促进有机酸的转化,从而降低有机酸对厌氧微生物的抑制作用.

Effects of goethite on the anaerobic fermentation process of organic fraction of municipal solid wastes,including the biogas production and characteristics of leachate,were investigated in the anaerobic digesters constructed by PVC. The results showed that the addition of goethite promoted hydrolysis and acidogenesis efficiency of solid wastes and gas production rate. The total gas volume was 163. 4 L,which increased by 20% compared to the blank. The intermediate products of Fe2 +,NH+ 4-N,NO-3-N,COD and organic acids in the leachate were analyzed. Results showed that the addition of goethite reduced the system ORP to- 124 mV which could improve the activity of the anaerobic microorganism. Addition of goethite could also promote the utilization of organic acids which decreased the inhibition effects of organic acids on the anaerobic microorganism.