Article
Environmental Sciences
Mi Xue, Yuting Nie, Xiwei Cao, Xin Zhou
Summary: Sulfur-based autotrophic denitrification using sulfite as the electron donor was established in this study. The optimal sulfur-to-nitrogen ratio was found to be 2.63, achieving high denitrification rate and nitrogen removal efficiency. Microbial community analysis confirmed the presence of key sulfur-oxidizing denitrifying bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shengjie Li, Yunmeng Pang, Guodong Ji
Summary: The study showed that sulfur pollution significantly increased N2O emissions in natural environments. After long-term addition of sulfide, N2O accumulation in both microcosms exceeded 1.5% of nitrate load, which was 12.9 times higher than N2O accumulation without sulfide addition.
ENVIRONMENTAL POLLUTION
(2021)
Article
Engineering, Environmental
Fan Chen, Zhiling Li, Yin Ye, Miao Lv, Bin Liang, Ye Yuan, Hao-Yi Cheng, Yang Liu, Zhangwei He, Hongcheng Wang, Yuheng Wang, Aijie Wang
Summary: In this study, a coupled sulfur and electrode-driven autotrophic denitrification (SEAD) process was proposed, which achieved superior nitrate removal performance and self-balance of acidity-alkalinity capacity by regulating the applied voltage. The experiment results showed that SEAD process could enhance nitrate removal rate and reduce sulfate accumulation. Both S-0 and electrode served as active bio-carriers constructing denitrification communities and functional genes, with S-0 demonstrating greater denitrification potential as an electron donor.
Article
Engineering, Environmental
Jingshu Wang, Beichen Zhang, Jinhui Jeanne Huang, Yuan Liao, Nan Xiao
Summary: A Carbon-coated Iron Autotrophic Denitrification (CCIAD) system was established to achieve higher removal efficiency of NO3-N and TN by optimizing electron pathways provided by Fe-0.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Hong Liu, Wei Zeng, Jianmin Li, Mengjia Zhan, Zhiwei Fan, Yongzhen Peng
Summary: The effect of S2O32--S addition on Anammox coupling sulfur autotrophic denitrification was investigated. It was found that moderate S2O32--S addition promoted complete nitrogen removal, but high S2O32--S concentrations inhibited Anammox activity.
Article
Environmental Sciences
Yunyi Zha, Rui Wan, Mengqi Wu, Ping Ye, Liangtao Ye, Xiaoxiao Li, Haifeng Yang, Jingyang Luo
Summary: To address the shortage of carbon source in sewage, inorganic electron donors containing sulfur were added to the traditional heterotrophic denitrification process. However, the effects of these extraneous inorganic electron donors on heterotrophic denitrification were largely unknown. This study discovered a hormesis-like effect of ferrous sulfide (FeS, an inorganic electron donor) on Paracoccus denitrificans, where the removal efficiency of total nitrogen increased with low dosage of FeS but decreased with high dosage. The study also revealed that the influence of FeS on glucose utilization and bacterial growth exhibited a hormesis-like effect.
Article
Engineering, Environmental
Akashdeep Singh Oberoi, Haiqin Huang, Samir Kumar Khanal, Lianpeng Sun, Hui Lu
Summary: Sulfur-driven autotrophic denitrification (SdAD) is an effective alternative for treating water and wastewater streams with low organic carbon content. The distribution of electrons in the SdAD process is significantly influenced by the rate of sulfide loading, with competition intensifying among nitrogen oxide reductases. Sulfide was found to be a preferable electron donor compared to elemental sulfur, resulting in lower accumulation of denitrifying intermediates.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Huijun Wen, Jia Yan, Lingyao Wu, Xiangyang Chang, Weizhuo Ye, Hongguo Zhang, Lei Huang, Tangfu Xiao
Summary: This study found that a bio-scrubber can efficiently remove hydrophilic H2S and hydrophobic CS2, and the removal efficiency is influenced by the S/N ratio and oxygen content.
Article
Agricultural Engineering
Yanfei Wang, Guangxue Wu, Xiaona Zheng, Wei Mao, Yuntao Guan
Summary: This study applied a pyrite-driven autotrophic denitrification biofilter for simultaneous removal of NH4(+) and NO3- and investigated the factors influencing system performance and analyzed the dominant microbial populations and nitrogen and sulfur metabolism. The results showed that the nitrification/Anammox reaction and pyrite-driven autotrophic denitrification synergistically removed NH4(+) and NO3-.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Shuo Huang, Deshuang Yu, Guanghui Chen, Yanyan Wang, Peng Tang, Chengcheng Liu, Yuan Tian, Meng Zhang
Summary: The study demonstrates that autotrophic denitrification can effectively remove nitrate and sulfide while achieving nitrite accumulation; the accumulation rate of nitrite varies under different S/N ratios; changes in microbial community structure are closely related to the autotrophic denitrification process.
Article
Environmental Sciences
Yingjie Zhu, Francesco Di Capua, Duanxin Li, Huaizheng Li
Summary: This study investigates the effects of pretreatments on pyrite-driven autotrophic denitrification (PAD) and finds that ultrasonication and acid-washing can improve denitrification performance and biofilm formation. Microbial community analysis reveals the dominance of Thiobacillus and Rhodanobacter in PAD systems. A PAD mechanism model is proposed to optimize nitrogen removal.
Article
Engineering, Environmental
Dongyeon Kim, Minsu Pyo, Daegi Kim, Sanghyun Jeong, Kang Hoon Lee, Eui-Jong Lee
Summary: In this study, sulfur powder was used to effectively remove remaining nitrate in a biological treatment process. The potential for membrane fouling in a sulfur-based denitrification reactor was investigated and compared to a conventional activated sludge. The results showed higher removal efficiency in the sulfur-based denitrification reactor but more significant membrane fouling.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yi-Lu Sun, Zhuo-Ran Li, Xue-Ning Zhang, Heng Dong, Zhi-Min Qian, Shan Yi, Wei-Qin Zhuang, Hao-Yi Cheng, Ai-Jie Wang
Summary: Elemental sulfur autotrophic denitrification (S0AD) is a promising method for wastewater treatment with lower costs, zero carbon dioxide emission, and minimum sludge production. This study demonstrated the effectiveness of a pilot-scale S0AD packed-bed in removing nitrate to below the national standard, with temperature and bacteria species playing important roles. The findings provide guidance for the design and operation of S0AD packed beds in practical engineering.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Liangliang Liu, Yangjin Xu, Hanping Pan, Cunxue Yu, Qian Liu, Chaohai Wei, XiuFang Zhao, Meirong Su, Jianxin Pan
Summary: This study investigated and compared the utilization behavior of reduced sulfur (-2) compounds (S2-, FeS, and SCN-) in autotrophic denitrification process. The results showed that SCN- exhibited the best denitrification performance, while S2-system inhibited nitrate reduction and FeS system efficiently accumulated nitrite. Additionally, intermediates containing sulfur were rarely produced in SCN- system, and the utilization of SCN- was limited compared to S2-in coexistence systems. The study provides a theoretical basis for regulating and utilizing reduced sulfur (-2) compounds in autotrophic denitrification process.
ENVIRONMENTAL RESEARCH
(2023)
Article
Agricultural Engineering
Pengfei Huo, Xueming Chen, Linyan Yang, Wei Wei, Bing-Jie Ni
Summary: This study developed an integrated model to describe the interactions between sulfur-oxidizing bacteria and Anammox bacteria, and investigated the influence of influent conditions on the performance and microbial community structure of the anoxic reactor.
BIORESOURCE TECHNOLOGY
(2022)