Su Lianghu,Shi Xinlong,Guo Guangzhai,Zhao Aihua,Zhao Youcai
The potential benefits of nanoscale zero-valent iron (nZVI) on sludge stabilization, either the abatement of odor or the improvement of biogas production, were investigated in this study. Two commercial-grade microscale iron powders were also utilized for comparison. Adding 0.10 wt% of nZVI in sludge during anaerobic incubation significantly reduced the concentration of H 2 S in biogas by 98.0 % (96.2–98.9 %), probably attributed by reactions between sulfides and the neo-formed hydrous Fe(II)/Fe(III) oxides layer at the surface of ZVI nanoparticles. Meanwhile, the percentage of P in bioavailable fractions decreased from 76.8 to 52.5 %, possibly due to the formation of vivianite [Fe 3 (PO 4 ) 2 ]. Furthermore, 0.10 wt% of nZVI in anaerobic digestion for 17 days enhanced the concentration of CH 4 in biogas by 5.1–13.2 % and improved the production of biogas and methane by 30.4 and 40.4 %, respectively. The amendment of iron nanoparticles during anaerobic digestion can not only effectively reduce H 2 S in biogas, but also potentially boost methane production significantly.
Li He,Zichang Yang,Yuyao Xu,Xingkai Lu,Sory Kaba,Changming Li,Xiaolong Yao,Dong Xu,Zhiliang Yao
Odor pollutants produced by broiler houses can significantly impact the quality of the life of residents and the ecological environment, so it is crucial to explore odor purification technologies. In this study, a defect-rich CuUiO-66@TiO 2 photocatalyst was successfully synthesized for the photocatalytic degradation of five typical odors in broiler houses. CuUiO-66 and TiO 2 in a 1:3 ratio was the most effective in removing odors, capable of removing 99% of methyl mercaptan, 99% of dimethyl sulfide, 99% of dimethyl disulphide, 86.47% of toluene and 63.09% of ethyl acetate in 60 min. After five cycles degradation, the photocatalyst can remain the crystal structure and keep the photocatalytic degradation rate at 95.2% of methyl mercaptan. Furthermore, the proposed mechanisms for the removal of five odors by CU1T3 have been discussed. Therefore, this study has developed a highly efficient photocatalyst that can effectively eliminate odors emitted from broiler houses. This is a promising solution to address the challenges of odor treatment in the near future.
危险品化学品经营许可证（带存储）