Article
Engineering, Environmental
Lingfei Zhang, Junfeng Su, Amjad Ali, Tinglin Huang, Changlun Chen, Wenshuo Yang
Summary: A biofilm reactor using Burkholderia sp. CF6 was developed, and polymers were attached to alkali-modified corn stover to create a novel slow-release carbon source. This carbon source released carbon steadily to support denitrification while promoting cellulose degradation. The effects of hydraulic retention time, pH, and carbon to nitrogen ratio on nitrate removal efficiency were studied, and optimal conditions yielded a removal efficiency of 98.03%. Soluble microbial products were found to play a dominant role in denitrification, and Burkholderia sp. CF6 was identified as the main denitrifying agent. This study provides a theoretical basis for effective management of micro-polluted water bodies.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Chuanfu Zhao, Yibing Wang, Shuangyu Meng, Wenhao Zhang, Xinwen Zhang, Liangguo Yan, Qin Wei, Dong Wei
Summary: This study established a microbial fuel cell (MFC) assembled with poly(butanediol succinate) (PBS) in an aerobic granular sludge (AGS) bioreactor for simultaneous nitrogen removal and electricity generation. The results showed that the AGS-MFC group achieved significantly improved total inorganic nitrogen (TIN) and COD removal efficiencies, as well as increased average output voltage and maximum power density in the MFC module after 100 days of operation. High-throughput sequencing analysis revealed that Thauera-related denitrifying bacteria had the highest relative abundances in both bioreactors, while the relative abundance of Nitrosomonas-related ammonia oxidizing bacteria (AOB) was enriched in the AGS-MFC group.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Review
Environmental Sciences
Feifan Zhang, Chengjin Ma, Xiangfeng Huang, Jia Liu, Lijun Lu, Kaiming Peng, Shiyang Li
Summary: This paper reviews the application of solid carbon source-based denitrification in different water bodies, indicating that synthetic sources generally exhibit superior denitrification performance. While SCS can be widely used for various water bodies, key research aspects differ significantly based on the target water body characteristics, necessitating tailored studies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Ying Cui, Bowei Zhao, Fei Xie, Xiao Zhang, Aijuan Zhou, Sufang Wang, Xiuping Yue
Summary: This study proposes a novel adding-type wastepaper-flora (AT-WF) slow-release carbon source and demonstrates its significant carbon release ability, stability, and efficient denitrification performance. The findings suggest that this carbon source has potential important applications in wastewater treatment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agricultural Engineering
Ying Cui, Bowei Zhao, Xiao Zhang, Xiao Ma, Aijuan Zhou, Sufang Wang, Xiuping Yue, Jianzheng Li, Jia Meng
Summary: Using wastepaper as an external carbon source is an alternative method for total nitrogen removal in low carbon to nitrogen ratio municipal sewage. Previous studies focused on separate denitrification units using cellulose-rich wastes for in-situ fermentation, but this approach can lead to blockages and prolonged process chains. In this study, a novel in-situ fermentation wastepaper-flora slow-release carbon source (IF-WF) was proposed and applied in the original denitrification unit. IF-WF was efficiently utilized in situ, with denitrification rate increasing with nitrate nitrogen concentration. However, internal acidification of IF-WF inhibited fermentation, and it also limited the growth of polysaccharides in denitrified sludge. IF-WF ultimately formed a structure dominated by nitrate-reduction bacteria outside and cellulose-degrading bacteria inside. These findings provide insights into the mechanism of IF-WF for in-situ fermentation and nitrogen removal.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Jiaqing Tao, Haoqin Xu, Ting Zhang, Zhaoyang You, Kinjal J. Shah
Summary: Using reed straw as a carbon source can enhance nitrogen removal in wetlands. The addition of reed straw increased the organic matter content in the wetland and significantly improved the removal of nitrate nitrogen and nitrite nitrogen.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Agricultural Engineering
Lilong Yan, Jishuang Jiang, Shuang Liu, Mingyue Yin, Mengya Yang, Xiaoqi Zhang
Summary: A new strain JI-2 of strongly autoaggregating aerobic denitrifying bacteria was screened, and its nitrate removal ability and autoaggregation mechanism were analyzed. The study found that JI-2 had a high nitrate removal rate under alkaline and low carbon-to-nitrogen ratio conditions. It removes nitrate through aerobic denitrification and dissimilation pathways, and removes ammonium through an assimilation pathway. JI-2 strain has complex nitrogen metabolism genes, and C-di-GMP plays an important role in mediating its motility behavior and autoaggregation.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Congyu Li, Yanjie Zhang, Yu Ling, Haiyan Wang, Huan Wang, Guokai Yan, Liang Duan, Weiyang Dong, Yang Chang
Summary: MFC anodic denitrification combined with solid-phase denitrification was achieved by adding slow-release carbon source fillers (CPSP) to the anolyte. The MFC experimental group with CPSP showed a slightly longer start-up period but exhibited higher maximum output voltage and power density compared to the control group. CPSP improved the affinity and tolerance of MFC to nitrate, alleviated electron competition, and enhanced coulombic efficiency.
ENVIRONMENTAL RESEARCH
(2023)
Article
Agricultural Engineering
Haiyan Li, Zhaoying Liu, Chaohong Tan, Xiaoran Zhang, Ziyang Zhang, Xiaojuan Bai, Liyuan Wu, Hua Yang
Summary: In this study, a excellent mixotrophic denitrification system was established by adding plant carbon source and sulfur to the bioretention system, which showed high efficiency in removing nitrate nitrogen and other pollutants. The different layers of the system exhibited different bacterial dominance and the upper layer had higher abundance of functional genes.
BIORESOURCE TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Hongwei Zhang, Hongxu Liang, Libin Xing, Wei Ding, Zengchao Geng, Chenyang Xu
Summary: In this study, carbon spheres (CSs) were prepared as a fertilizer carrier using cellulose, followed by the preparation of three new carbon-based slow-release nitrogen fertilizers using different methods. The direct mixing method showed the most effective promotion of pakchoi growth and crop quality improvement. Mechanistic studies revealed the participation of C-N, -COOR, pyridine-N, and pyrrolic-N in nitrogen release. This study provides a simple, effective, and economical method for the preparation of slow-release fertilizers and suggests new directions for further research and development.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Agricultural Engineering
Ziwei Chen, Qingyang Zuo, Caihong Liu, Lin Li, Katherine Y. Deliz Quinones, Qiang He
Summary: This study developed two novel economical solid carbon sources (SCSs) named PCL/PS and PCL/SB by combining polycaprolactone (PCL) with new natural materials (peanut shell, sugarcane bagasse). The removal of NO3-N was significantly higher in PCL/PS and PCL/SB compared to PCL and PCL/TPS. The predicted abundance of functional enzymes revealed the potential metabolism pathways of major components of SCSs.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Hong-wei Zhang, Li -bin Xing, Hong-xu Liang, Shu-zhi Liu, Wei Ding, Jian- guo Zhang, Chen-yang Xu
Summary: This study synthesized six types of slow-release nitrogen fertilizers, among which the sodium alginate coated biochar-based fertilizer with carbon fertilizer ratio of 2:1 (BUS2) showed the best performance by significantly slowing down the release of nitrogen, reducing the cost of fertilizer, and increasing crop yield.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Agricultural Engineering
Lingzhan Miao, Wenyun Chai, Dan Luo, Tanveer M. Adyel, Jun Wu, Ming Kong, Wanzhong Wang, Jun Hou
Summary: A hybrid scaffold of polyvinyl alcohol/sodium alginate was used to prepare solid carbon sources (SCSs) for treating low carbon/nitrogen wastewater. The performance of denitrification was higher with the blended SCSs, and the microbial community structure was significantly affected.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Heng Wu, Qian Zhang, Xue Chen, Liangbo Wang, Wandong Luo, Zhengyi Zhang, Hao Liu, Tiantao Zhao
Summary: The study found that nitrogen removal performance varies significantly under different types of biodegradable polymer carriers and hydraulic retention times. Short retention times can impact nitrogen removal efficiency and alter microbial community composition.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Xiao-Li Yang, Ling Zang, Jia-Jin Chen, Han Xu, Yi-Jing Yang, Hai-Liang Song
Summary: In this study, a three-chamber microbial electrolysis cell (MEC) was used to simultaneously migrate, transform, and remove NH4+-N, NO2--N, and NO3--N under different applied voltages. Higher applied voltages accelerated the migration rate of NH4+-N but had little effect on NO2--N and NO3--N. The highest total nitrogen (TN) removal efficiency was achieved at an applied voltage of 1.0 V. The study also discussed the nitrogen removal performance at different carbon to nitrogen (C/N) ratios, indicating the beneficial effect of nitrogen migration by applied voltages combined with nitrogen transformation.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)