复合铁添加物对混合有机固废厌氧产氢的影响

将城镇污水处理厂的城市污泥与餐厨垃圾混合后,经厌氧消化处理后可产生能源气体氢气,从而达到资源化利用的目的.废铁屑是机械加工厂的固体废弃物,将其处理后可得到一种新型复合铁材料(FE/FEO).将城市污泥和餐厨垃圾预处理后按体积比1:1比例混合,分别等分放入2个反应器中,一个投加FE/FEO粉末作为为FE/FEO组,另一个...

Effects of iron filings additives on anaerobic hydrogen production from mixed organic solid wastes

Mixed wastes of municipal sludge from urban wastewater treatment plant (WWTPs) and kitchen waste from catering industry could be utilized to produce biomass energy gas hydrogen by anaerobic digestion process. Iron scraps, solid waste from mechanical processing plants, was treated to iron-containing FE/FEO powder in this paper. After pretreatment, mixing municipal sludge mixed with the same amount of kitchen waste (by the ratio of 1∶1), and then equally divided into two reactors. FE/FEO material was added to one of the anaerobic reactors as FE/FEO group while the other one without FE/FEO as the control group. The effect of FE/FEO on the rate of yield hydrogen by anaerobic fermentation process for the mixed organic solid waste was investigated. The results showed that the maximum hydrogen volume fraction of FE/FEO group was 61.4%, which was 15% higher than that of the control group, while cumulative hydrogen yield and the maximum yield of daily hydrogen of FE/FEO group were 49. 0 and 22.7 L·kg−1 (based on the volume of hydrogen produced by 1 kg volatile organic solid) within 24 hours, respectively, which were 56% and 59% higher that of the control group, respectively. The content of Fe2+ in the FE/FEO group reached a maximum value of 109.8 mg·L−1 at the 24th hour; while the content of volatile organic acid by 2 675 mg·L−1 was 15% higher than that of the control group during 24 h. It is found that FE/FEO powder not only contains elemental Fe and ferrous oxide, but also pinhole α-FeOOH, which increases the specific surface area and plays an important role as the loose structure frame of the microbes in the anaerobic system. Therefore, the addition of FE/FEO plays a promoting role in hydrogen production by anaerobic fermentation process. The study can provide a reference for improving the hydrogen production by anaerobic fermentation process for organic solid wastes.