Article
Agricultural Engineering
Miao Zhang, Jing Gao, Quanlong Liu, Yajun Fan, Chenjie Zhu, Yizhong Liu, Chengda He, Jun Wu
Summary: The study investigated the effect of influent COD/NO3- ratios on partial denitrification, showing that higher ratios led to improved denitrification efficiency and nitrate removal. Microbial analysis indicated lower diversity and more concentrated microbial communities at a specific COD/NO3- ratio.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Shenbin Cao, Yu Lan, Rui Du, Yongzhen Peng
Summary: This study investigated the influence of relatively high COD/NO3--N ratios on nitrite production in Partial Denitrification (PD) systems. It was found that a high nitrite production could still be obtained even with an increased COD/NO3--N ratio, but with a longer reaction time, the nitrite production decreased. However, after reducing the influent COD/NO3--N to a normal level, high nitrite production was rapidly achieved. The study demonstrated the robustness and stability of acetate-driven PD in response to high COD/NO3--N.
Article
Biotechnology & Applied Microbiology
Junhui Li, Paul Dijkstra, Qihong Lu, Shanquan Wang, Shaohua Chen, Deqiang Li, Zhiheng Wang, Zhenglei Jia, Lu Wang, Hojae Shim
Summary: The study identified 952 genomes carrying genes associated with DMF degradation, expanding the known diversity of bacteria with this metabolic capability. Both aerobic and anaerobic pathways for DMF degradation were found, with microbial consortia potentially more advantageous than pure culture in degrading DMF in wastewater.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Engineering, Environmental
Meng Jiang, Yating Wu, Shiyin Hu, Qingxi Li, Shouwen Chen
Summary: This study enriched a high-efficiency denitrification community by gradually shifting the COD/N ratio and assembled a simplified denitrification microbial consortium. The novel consortium achieved a 98.4% total nitrogen removal rate at a COD/N ratio of 3.2 and enhanced the denitrification performance of nitrate-contaminated groundwater under low COD/N ratios.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Suyun Xu, Yuqing Zhang, Yuting Duan, Chongyang Wang, Hongbo Liu
Summary: In this study, the circular microbial electrolysis cell (MEC) system showed high rates of nitrogen removal under low C/N ratios. The symbiotic activity of Anammox and electrochemical autotrophic denitrifiers was verified, demonstrating that different denitrification processes can coexist and collaborate in the MEC system to avoid strict nitritation towards Anammox.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Elackiya Sithamparanathan, Nora B. Sutton, Huub H. M. Rijnaarts, Katarzyna Kujawa-Roeleveld
Summary: Discharge of nitrogen with wastewater causes eutrophication in surface water, but nutrient-rich wastewater can be valuable for agriculture. Tailoring N removal or conservation is important to meet the requirements of different water end uses. Improved vertical flow constructed wetlands with pumice as substrata showed the highest TN removal at both COD/N ratios.
Article
Engineering, Environmental
Baokun Yang, Yanling Wang, Yao Lu, Lijie Liu, Shaobin Huang, Fangqin Cheng, Zhengjun Feng
Summary: This study investigated the effects of different S/N ratios on simultaneous denitrification and desulfurization using low-cost corncob as a carbon source. The results showed that solid slow-release carbon sources effectively remove sulfates and nitrates in industrial wastewaters, providing theoretical references for practical applications.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Paula Bucci, Bibiana Coppotelli, Irma Morelli, Noemi Zaritzky, Alejandro Caravelli
Summary: This study investigated the effects of different COD/N ratios and the addition of micronutrients on granule size and simultaneous nitrification-denitrification (SND) in a laboratory-scale aerobic SBR system. The results showed that small-size granules could be developed at the appropriate COD/TKN ratio with micronutrients, leading to better removal of inorganic nitrogen. However, without micronutrients and at a lower COD/TKN ratio, larger granules with lower removal efficiency were observed.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Zhijie Zeng, Yiying Wang, Wenxuan Zhu, Tian Xie, Lingling Li
Summary: The COD/NO3- -N ratio is a crucial factor for effective nitrite accumulation in partial denitrification. In this study, microbial community structure and nitrite accumulation performance were investigated in two parallel reactors with glucose as the carbon source, operating at COD/NO3- -N ratios of 3 and 5. The maximum nitrite accumulation ratios were found to be 17.9% and 47.04% at COD/NO3- -N ratios of 3 and 5, respectively. The dominant genus in both reactors on day 220 was Thauera, with relative abundances of 18.67% and 64.01%, respectively. Batch experiments using different electron acceptors suggested that the differences in abundance of Thauera may be responsible for the discrepancy in nitrite accumulation at COD/NO3- -N ratios of 3 and 5.
Article
Engineering, Environmental
Andres Pichel, Andrea Fra, Nicolas Morales, Jose Luis Campos, Ramon Mendez, Anuska Mosquera-Corral, Angeles Val del Rio
Summary: This study demonstrates that despite the higher sCOD/N ratios in OFMSW digestate, good synergy can be achieved through AS pre-treatment in the PN-AMX process, resulting in better effluent quality and lower nitrogen removal rates.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Jiandong Liu, Xinrong Fu, Rongfang Yuan, Zhongbing Chen, Beihai Zhou, Huilun Chen
Summary: This study investigated the effect of alkali pre-treated corncob as an external carbon source on nitrogen removal and determined the denitrification performance using SBBR. The results showed that alkali pre-treated corncob had a higher carbon release capacity and excellent denitrification rate, effectively improving the denitrification performance of low C/N ratio wastewater.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Yuanjun Liu, Liang Guo, Pengtao Gao, Dan Yu, Zhiwen Yao, Mengchun Gao, Yangguo Zhao, Chunji Jin, Zonglian She
Summary: This study investigated the use of mariculture solid wastes acidogenic liquid pretreated by thermophilic bacteria and alkyl polyglucose as a carbon source for denitrification to remove nitrogen in marine recirculating aquaculture systems. It was found that under specific conditions, high denitrification efficiency and rate could be achieved.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yilin Li, Wenjia Zhang, Yun Dai, Xiaomei Su, Yeyuan Xiao, Dan Wu, Faqian Sun, Rongwu Mei, Jianrong Chen, Hongjun Lin
Summary: This study investigated the start-up, influencing factors, and stable operation of partial denitrification for treating biological effluent from landfill leachate. The research found a suitable ratio of nitrate/ammonium for downstream Anammox process, and highlighted the importance of carbon sources, COD/NO3--N ratio, and salinity in partial denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Naveen Chand, Kapil Kumar, Surindra Suthar
Summary: The study demonstrated that intermittent aeration in VFCWs significantly improved the removal efficiency of COD, NH4+-N, NO3-N, and TP compared to non-aerated setups, while setups with biochar (BC) addition and plantation were more advantageous in nutrient removal than those without BC. Moreover, the COD/N ratio of wastewater did not have a significant impact on VFCWs with BC and intermittent aeration, indicating the effectiveness of slow adsorption and fast aerobic degradation processes.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Agricultural Engineering
Hengyi Liu, Lei Li, Wenjie Ye, Lingyu Ru, Guotao Liu, Xuya Peng, Xiaoming Wang
Summary: A hybrid activated sludge membrane-aerated biofilm reactor based on a two-stage simultaneous nitrification-denitrification (SND) process was successfully utilized for treating interflow with low COD/N ratio. The reactor showed stable operation and high removal efficiency for COD, TN, and ammonia nitrogen under low COD/N conditions. Additionally, aerobic denitrification was found to play an important role in the denitrification process under aerobic conditions.
BIORESOURCE TECHNOLOGY
(2022)
