氧化铁投加方式对餐厨垃圾厌氧消化产气的影响

氧化铁可以促进产甲烷菌的代谢活动,从而加快厌氧消化体系的产甲烷速率。通过设计3组反应器,探究了不同的氧化铁添加方式对餐厨垃圾厌氧消化产甲烷的影响:包括空白组A(餐厨垃圾+厌氧污泥),以及2个实验组B(餐厨垃圾+厌氧污泥,48 h后投加氧化铁)和C(餐厨垃圾+厌氧污泥+氧化铁)。结果表明:反应器A酸化严重,进入长期产甲烷抑制状态;反应器B可以解除酸抑制,恢复体系产甲烷能力,但需要较长的启动期;反应器C则能较快达到产甲烷阶段。此外,截止到第54天实验结束,反应器C的累积产甲烷量(48 349 m L)高于B(35 665 m L)。对于餐厨垃圾厌氧消化,投加氧化铁可解除体系酸抑制,恢复其产甲烷能力。而在厌氧消化初期加入氧化铁可以更快地解除酸抑制,并促成更高的产甲烷速率。

INFLUENCE OF ZVI ON THE OUTPUT OF LACTIC ACID OF THE UNITED FERMENTATION OF FOOD WASTE AND SURPLUS SLUDGE

Waste activated sludge regulated by food waste were fermented,with iron dosage (ferrous dosage in 1 gram of VSS) of 0,0.13,0.26,0.52 and 1.04 g,at temperature of 50 ℃.In this paper,the effect of iron dosage on lactic acid,iron,pH,ORP were discussed.The results showed that ZVI (zero valent ion) could facilitate the utilization and translation of polysaccharide.Moreover,ORP of the mixture was reduced with iron dosing and part of the basicity could be provided in this fermentation system.ZVI could obviously promote the yield of lactic acid in this fermentation system.The yield of lactic acid was 0.64 g/g(VSS) on the 6th day with iron dosage of 1.04 g/g,which was improved by 4.88 times,compared to the R-0 (blank) fermentation system.