Article
Environmental Sciences
Liaofan Tang, Ji Li, Yong Li, Xiaolei Zhang, Xianbin Shi
Summary: Optimal denitrification was achieved at a ratio of 2:1 by adjusting the elemental sulfur content in the composite fillers, leading to an increase in microbial abundance. The biofilm composition transitioned from a single dominant species to multiple species, with an increase in genes related to sulfur metabolism.
Article
Environmental Sciences
Wentao Zhu, Jing Chen, Hongjun Zhang, Sicheng Yuan, Weijie Guo, Qian Zhang, Shiyang Zhang
Summary: In this research, a pyrite-intensified hybrid sequencing batch biofilm reactor (PIHSBBR) was designed to treat low C/N ratio domestic wastewater. The results showed that PIHSBBR could achieve optimal removal of COD, NH4+-N, and TN under certain conditions. High-throughput sequencing analysis revealed the presence of anaerobic ammonium oxidation and dissimilatory nitrate reduction to ammonium within the system.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Dongyue Li, Wei Guo, Dongbo Liang, Jing Zhang, Jun Li, Peilin Li, Yaodong Wu, Xueying Bian, Fan Ding
Summary: This study examined the feasibility of using the SNEDPR-AGSBR process for treating low C/N ratio domestic sewage. The results showed that the rapid start-up and advanced nutrient removal were successfully achieved by selecting slow-growing organisms. The SNEDPR-AGSBR process demonstrated high removal efficiencies for nitrogen and phosphorus, indicating its potential for treating low C/N ratio domestic sewage.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Yang Zhao, Jianwei Li, Qiyu Liu, Zhao Qi, Xiyao Li, Qiong Zhang, Jun Sui, Chuanxin Wang, Yongzhen Peng
Summary: This study investigated the in situ start-up of a partial-denitrification/anammox (PD/A) process in a traditional A(2)/O process and successfully started up the PD/A system within 60 days. The nitrogen removal efficiency of the system increased by 16.9% and the in situ anammox activity reached 1.0 mg NH4+-N/L/h, contributing 37.9% to total nitrogen removal. The study also found that the addition of in situ AnAOB showed a better coordination between denitrifiers and AnAOB in the system.
Article
Chemistry, Analytical
Xiaohong Hong, Liaofan Tang, Haixia Feng, Xiaolei Zhang, Xianqiong Hu
Summary: Mixotrophic denitrification has shown potential for treating wastewater with a low C/N ratio. This study investigated the use of agricultural solid wastes as carbon source for mixotrophic denitrification and found that corncob was the most effective carbon source. Combining corncob with sulfur beads increased the denitrification efficiency of the system. The study also identified the microorganisms involved in the denitrification process.
Article
Agricultural Engineering
Huicheng Ni, Muhammad Arslan, Zhishui Liang, Chencheng Wang, Zhijun Luo, Junchao Qian, Zhiren Wu, Mohamed Gamal El-Din
Summary: Lithium battery slurry wastewater was effectively treated using basalt fiber bio-carriers in a biological contact oxidation reactor, resulting in a significant reduction in COD and total nitrogen levels. Metataxonomic analysis revealed the presence of various bacteria involved in denitrification and decarbonization processes. This study provides a novel approach for denitrification in the treatment of lithium slurry wastewater under low C/N conditions.
BIORESOURCE TECHNOLOGY
(2022)
Review
Environmental Sciences
Shaoting Chen, Beihai Zhou, Huilun Chen, Rongfang Yuan
Summary: In recent years, iron mediated autotrophic denitrification has become a focus in wastewater treatment. However, there is a lack of a systematic summary of iron-based materials used for denitrification, as well as a detailed overview of the mechanisms involved. This study provides a summary of iron materials with different valence states for denitrification, emphasizes the mechanisms in different interaction systems, analyzes the contribution of microorganisms in nitrate reduction, and evaluates the effects of operating conditions and water quality. The challenges and shortcomings of the denitrification process are also discussed for better practical engineering applications of iron-based denitrification.
ENVIRONMENTAL RESEARCH
(2023)
Article
Agricultural Engineering
Zhijie Zheng, Amjad Ali, Junfeng Su, Tinglin Huang, Yue Wang, Shuai Zhang
Summary: The study established a bioreactor by cultivating denitrifying Pseudomonas stutteri sp. GF3 immobilized on fungal pellets, achieving 100% denitrification efficiency under optimal conditions. Moreover, the metabolic activities of denitrifying bacteria were enhanced with the increase of C/N, and strain GF3 was identified as the dominant strain in the bioreactor based on high-throughput sequencing analysis.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Lianfang Zhao, Liuying Xue, Li Wang, Cheng Liu, Ying Li
Summary: Heterotrophic-autotrophic denitrification is a cost-effective and risk-reducing approach for wastewater treatment. This study investigated a mixotrophic denitrification system with mixed bacteria to treat low-C/N ratio wastewater and achieved lower total nitrogen (TN) levels compared to heterotrophic and ferrous autotrophic systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Hao Sheng, Rui Weng, Yan He, Zheng Wei, Yanmei Yang, Jinghan Chen, Minsheng Huang, Gongming Zhou
Summary: This study identified a nitrate-calcium-based pathway that accelerated the start-up of anammox. Calcium nitrate induced partial denitrification to provide nitrite for anammox, while also increasing the contribution of dissimilatory nitrate reduction to ammonium (DNRA). This mutualistic symbiosis among denitrification, DNRA, and anammox in the calcium nitrate-added systems explained the accelerated start-up of anammox.
BIORESOURCE TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Daying Chen, Yongkui Yang, Hongzhi Geng, Danning Chen, Zhi Qiao, Meilin Yin, Xiaohui Wang, Lin Zhao
Summary: The aim of this study was to propose a start-up strategy for the simultaneous nitrification-endogenous denitrification (SNED) process to treat low carbon/nitrogen wastewater economically and effectively. The strategy involved reducing DO concentration, optimizing operation duration, and gradually decreasing influent C/N. The study found that after start-up, the efficiency of nitrogen removal significantly increased, and key functional microbes in the microbial community also increased.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Mengyao Hu, Tianlie Luo, Qiulin Li, Yifei Xie, Guo Liu, Liujin Wang, Willie J. G. M. Peijnenburg
Summary: This study investigated the nitrogen removal performance and underlying mechanisms of a micro-electrolysis combined with biological denitrification (MEBD) system using an iron-carbon micro-electrolysis carrier. The results showed that the optimal denitrification effect for low C/N wastewater was achieved at specific conditions, and the addition of iron-carbon filler changed the microbial community structure and identified a new denitrifying bacteria. These findings provide theoretical and technical support for the nitrogen remediation of low C/N sewage.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Duoduo Liu, Lei Zhang, Tong Zhu, Youzhao Wang, Baorui Liang, Fei Kang
Summary: In this study, a comparative analysis of ESDAD and BSMD processes was conducted, and the optimal BSMD filter (F-3) with a nitrate removal rate of 556 +/- 13.6 mg NO3--N.L-1.d(-1) was identified. The pilot-scale reactor filled with filter F3 showed promising results in treating municipal sewage, with a desirable treatment capacity under varying conditions. The coexistence of autotrophs and heterotrophs in the reactor was observed, with autotrophs remaining dominant at seasonal temperatures.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Green & Sustainable Science & Technology
Wentao Zhu, Jing Chen, Sicheng Yuan, Wenjiao Sang, Yihui Ban, Shiyang Zhang
Summary: In this study, three double-layered mixotrophic sequencing batch biofilm reactors involving pyrite-based autotrophic denitrification were used to treat real domestic wastewater. By adjusting the frequency of intermittent aeration to 16 times per operating cycle, high removal percentages of ammonium-nitrogen, total nitrogen, and orthophosphate were achieved. The dominant microbial taxa observed in the system were found to contribute to the multiple nitrogen metabolism, and sulfur metabolic pathways were also identified. These findings provide new insights into the nutrient removal mechanism in PAD-based mixotrophic denitrification systems treating real domestic wastewater under intermittent aeration mode.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Yanbing Hu, Shuang Qiu, Qian Bi, Zhipeng Chen, Xingchen Zhang, Shijian Ge
Summary: MBC provides an alternative method for sustainable treatment of human toilet wastewater. This study compared the conventional activated sludge system and wastewater indigenous MBC system for nitrogen removal. The PN and nitrite-type denitrification process was established, resulting in a high nitrogen removal efficiency of 91.5% in the IMBCPN system. This study offers a sustainable approach for treating high NH4+-N strength wastewater.
Article
Environmental Sciences
Qiuju Liu, Jinfeng Wang, Hongqiang Ren
Summary: This study examined the assembly and succession of bacterial community in a full-scale IFAS process, highlighting the significant impact of pH on bacterial community composition and AHL content. The negative correlation between AHL concentration and community composition variation was observed during biofilm development. Additionally, quorum-quenching bacteria were found to play a key role in mature biofilms, strengthening bacterial cooperation and promoting biofilm development.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Cheng Cheng, Jinju Geng, Haidong Hu, Yihan Shi, Rongwei Gao, Xu Wang, Hongqiang Ren
Summary: The study explored the enhanced effects of alternative aerobic and anaerobic conditions in side-stream reactors on sludge reduction and pollutants removal performance. The results showed improved sludge reduction and carbon reuse in the modified reactors, providing an efficient and cost-saving technology for application in wastewater treatment plants. The cooperation interaction of different microbial populations played a key role in enhancing the overall performance of the treatment system.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Jun Hu, Tong Li, Xuxiang Zhang, Hongqiang Ren, Hui Huang
Summary: The study found that the UV/PAA process can effectively degrade steroid estrogens (SEs), with degradation rate related to the PAA dosage. After UV/PAA treatment, the estrogenic activity in the solution significantly decreased, while acute toxicity inhibition increased. Additionally, the UV/PAA process generates additional total organic carbon (TOC).
Article
Environmental Sciences
Xiangzhou Sun, Lili Jin, Fengyao Zhou, Kai Jin, Laichun Wang, Xuxiang Zhang, Hongqiang Ren, Hui Huang
Summary: This study analyzed patents to reveal the status and trends of chemical treatment for wastewater. China had the largest number of patents, while the United States was the main exporter of technology. The combination of chemical, biological, and physical processes was the mainstream, with ozonation and electro-chemical treatment being the major single technologies. Future trends included innovation in efficient removal of ammonia nitrogen, green water treatment agents, and resourcezation of wastewater, as well as research on energy-efficient technologies such as photocatalytic technology and microbial fuel cell.
Article
Environmental Sciences
Tong Li, Yilin Gao, Yingying Tang, Yujin Xu, Hongqiang Ren, Hui Huang
Summary: The advanced denitrogenation of wastewater faces challenges due to low C/N ratio and low temperature. This study introduces a new approach using sustained-release materials with good carbon release properties to enhance the denitrification process. The FeNi-LDH-CMC filter media demonstrated stable structure and effective carbon release performance, achieving high nitrogen removal efficiency in low C/N wastewater at low temperatures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Ying Zhao, Shanshan Zhu, Xuan Fan, Xuxiang Zhang, Hongqiang Ren, Hui Huang
Summary: This study provides a methodological example for studying the micro-interface behavior of wastewater biofilms through the integration of an experimental platform and multiple monitoring and analysis methods. The results reveal the microscopic processes of biofilm formation and species colonization, providing valuable guidance for regulating biofilm-related treatment processes and developing new technologies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Jun Hu, Tong Li, Ying Zhao, Xuxiang Zhang, Hongqiang Ren, Hui Huang
Summary: In this study, slow-release calcium peroxide (SR-nCP) was introduced into a widely-used denitrification biofilter (DNBF) for the simultaneous removal of steroid estrogens (SEs) and total nitrogen (TN) from low carbon to nitrogen (C/N) ratio wastewater. The results showed that the SR-nCP/biofilter effectively enhanced the removal of SEs and TN, with a high removal rate of SEs and a significant increase in denitrification load. The study also identified specific aerobic and anaerobic bacteria that played key roles in SEs degradation and simultaneous removal of SEs and TN.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Tong Li, Lili Jin, Shanshan Zhu, Xuxiang Zhang, Hongqiang Ren, Hui Huang
Summary: This study constructed a PAA/cobalt-loaded ceramsite-based DNBF system for the simultaneous removal of heterocyclic drugs and total nitrogen in biochemical tailwater. The results showed that the system had high removal efficiency for the drugs and significantly increased TN removal. The study provides a potentially effective strategy for the treatment of biochemical tailwater containing HCDs and contributes to the advancement of denitrification technology.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Xiaoya Fang, Chuanzhe Feng, Tong Li, Yanru Wang, Shanshan Zhu, Hongqiang Ren, Hui Huang
Summary: This paper reports a three-dimensional nanomaterial photocatalyst for the removal of heterocyclic drugs in water. The material shows improved removal efficiency and recyclability compared to two-dimensional nanomaterials.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Yingying Tang, Tong Li, Yujin Xu, Hongqiang Ren, Hui Huang
Summary: This study investigated the effects of electrical stimulation on conventional denitrification biofilters (DNBFs) treating industrial secondary effluent containing chlorophenols (CPs). The results showed that electrical stimulation significantly improved the removal rates of nitrogen and CPs, but had limited effect on reducing biotoxicity. Electrical stimulation promoted the growth of certain bacteria and further enhanced wastewater treatment performance.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Lili Jin, Xiangzhou Sun, Hongqiang Ren, Hui Huang
Summary: This study analyzed the hotspots and trends of biological filtration using visualization techniques, revealing China's leading role in terms of papers and patents. Co-occurrence analysis identified the associations between contaminants, chemicals, process, and characteristics. Recent advances in biological filtration were summarized, and future research directions were proposed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Environmental Sciences
Lili Jin, Xiangzhou Sun, Hongqiang Ren, Hui Huang
Summary: This study reveals the hotspots and trends in biological water treatment through bibliometric review and patents analysis, and proposes future research directions.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Environmental Sciences
Yujie Yan, Kai Jin, Hui Huang, Yanru Wang, Tong Li, Laichun Wang, Qing Wang, Hongqiang Ren
Summary: This study systematically investigated the water quality and toxicity reduction of biochemical tailwater from an integrated industrial park in Taihu Lake Basin, China. The biofilter with ceramsite-sulfur-siderite fillers showed significant reduction in estrogen toxicity, with the lowest effluent estrogen toxicity lower than the threshold for estrogen disruption effects. Electrical stimulation promoted the abundance of denitrifying bacteria and electroactive bacteria, enhancing the removal of nitrogen and estrogen toxicity. The study highlights the potential of electrolysis biofilter in advanced purification of industrial biochemical tailwater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Hui Huang, Lili Jin, Jun Hu, Yanru Wang, Hongqiang Ren
Summary: UV/peracetic acid (PAA) pretreatment significantly improves the removal of total nitrogen (TN) and steroid estrogens (SEs) in denitrification biofilter (DNBF), making it suitable for advanced treatment of wastewater for reuse.
Article
Engineering, Environmental
Boning Kong, Lili Jin, Ying Zhao, Hui Huang, Yanru Wang, Hongqiang Ren
Summary: This study explores the adaptive evolution laws of biofilm under stress from emerging pollutants in advanced wastewater treatment. It comprehensively analyzes the morphological variation, community succession, and assembly mechanism of biofilms under sulfamethoxazole and carbamazepine stress. The study highlights the ecological role of dominant species as pioneers and assembly hubs under stress and reveals the assembly pathways and resulting structural variation in biofilm development under EP stress.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
