Zero-valent iron (ZVI) improves nitrogen and phosphorus removal efficiency in municipal wastewater treatment systems. However, its effects on glycogen-accumulating organisms (GAOs) and the mechanisms of action are still not fully understood. This study investigated the influence of ZVI on GAOs by assessing its effect on the performance of a denitrification reactor dominated by Candidatus Competibacter sp. (with a relative abundance of 46.33%). After ZVI addition, the reactor harbored the iron-autotrophic denitrifying bacterium Ferruginibacter sp. (0.38%), the iron-reducing bacterium Pseudomonas sp. (0.26%), and the iron-oxidizing bacterium Comamonas sp. (0.26%). This effectively integrated ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) with heterotrophic denitrification alongside iron ammonium oxidation and nitrate-dependent ferrous oxidation. The integrated approach decreased aeration duration while improving the removal efficiency of PO43-P (98.01 ± 2.54%) and total inorganic nitrogen (TIN) (62.01 ± 1.45%). The combined of ZVI in systems predominantly occupied by GAOs enhanced the carbon storage capacity of the bacteria.
Nitrogen removal mechanisms of marine anammox bacteria (MAB) induced by zero-valent iron (ZVI) were investigated to reveal the differences resulting from nitrate or nitrite under high-salinity (3.5 %) and low-temperature (15 ± 1 °C) stress. The one-time addition of ZVI (20 g) altered the microbial energy metabolism and...
Shu-Yan Yin, Yu-Hui Fang, Sheng-Lei Sun et al.· Bioresource Technology· 0 citations
Iron‑sulfur coupling is a promising process for efficient nitrate removal, but its potential for simultaneous ammonia removal remains poorly recognized. This study established a biofilter (ISBF) using sponge iron and elemental sulfur as mixed fillers. Over 228 days of operation, ISBF achieved excellent nitrate (98.1%)...
Hao-Hao Miao, Wei Zeng, Xiao-Jing Hao et al.· Water Research· 0 citations
Metabolic pathway analysis indicated that the Schorl/H2O2 oxidation effluent markedly enhanced the abundance of peroxisomes, which help mitigate oxidative stress, and enriched pathways related to phosphonate and phosphinate metabolism.
Yu-Ting Wang, Jin-Mei Wen, Shu-Yao Wang et al.· Biodegradation· 0 citations
Under the "double carbon" goal, anaerobic digestion (AD) is irreplaceable for organic solid waste resource utilization, but ubiquitous microplastics (MPs) in substrates severely impair AD performance. Studies on regulating PE-MP-containing AD systems via zero valent iron (ZVI) remain scarce, so this study incorporated...
Guo-Xu Ao, Zhao-Xuan Wang, Yue-Qi Shi et al.· Environmental Science and Te...· 0 citations
Achieving stable and efficient nitrite accumulation in integrated partial denitrification/anammox (PD/A) processes is typically constrained by substrate competition among microorganisms, posing a significant challenge for large-scale engineering applications. This study proposes a novel strategy for regulating nitrogen...
Yue Yue, Hai-Yan Liu, Zhan-Sheng Ma et al.· Environmental Research· 0 citations
Iron-carbon autotrophic denitrification has shown potential for nitrogen removal from low-C/N wastewater. However, its application has been limited by slow Fe0 corrosion, increased alkalization, and insufficient inorganic carbon. CO2 induction represents a promising strategy for overcoming the above limitations. Here,...
Wei Xing, Guang-Xin Zhou, Chong-Yang Wang et al.· Water Research· 0 citations
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