Review
Engineering, Environmental
Peng Wu, Junjiang Chen, Vijay Kumar Garlapati, Xingxing Zhang, Francis Wani Victor Jenario, Xiang Li, Wenru Liu, Chongjun Chen, Tejraj M. Aminabhavi, Xiaonong Zhang
Summary: This study presents a comprehensive review of the anammox process, the advancements in nitritation and denitratation processes, and proposes a novel wastewater treatment method for efficient nitrogen removal.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Hong-Xu Bao, Zhuo-Ran Li, Ze-Bin Song, Ai-Jie Wang, Xue-Ning Zhang, Zhi-Min Qian, Yi-Lu Sun, Hao-Yi Cheng
Summary: This study investigated the impact of influent nitrate loading on nitrite accumulation during denitrification process and proposed the use of thiosulfate to mitigate the nitrite accumulation. Results showed that increasing nitrate loading exacerbated nitrite accumulation, but thiosulfate effectively reduced nitrite accumulation. However, nitrite accumulation rebounded with higher thiosulfate dosages, indicating accelerated nitrate and nitrite reduction rates alternately. Thiosulfate addition also led to significant growth in relative abundances of sulfurimonas and ferritrophicum.
ENVIRONMENTAL RESEARCH
(2022)
Article
Agricultural Engineering
Xuefan Liu, Bo Wang, Yongzhen Peng, Xiaofei Gong, Qingteng Gong, Xiyao Li
Summary: The study found that using sludge fermentation liquid for partial denitrification in treating domestic wastewater is feasible and can enhance NO2?-N concentration and nitrate-to-nitrite transformation. High-throughput sequencing analysis showed that the increases of Thauera, Paracoccus and Enterobacteriaceae contribute to the enhancement of partial denitrification.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Yao Chen, Ying Zhang, Liang Zhang, Shujun Zhang, Yongzhen Peng
Summary: Partial nitrification and partial denitrification combined with anammox is a promising process for sewage treatment, which was successfully achieved in this study by adding sludge fermentation products in the anoxic zone to facilitate nitrite accumulation and improve denitrification efficiency. The system achieved a high removal rate of total nitrogen, with enriched incomplete denitrifiers and ammonia oxidizing bacteria contributing to the high nitrite accumulation.
Article
Environmental Sciences
Zijian Zhu, Jiafu Qin, Zhenguo Chen, Yongxing Chen, Haochuan Chen, Xiaojun Wang
Summary: In this study, the thiosulfate-driven denitrification and Anammox process (TDDA) was successfully started and operated continuously for 146 days, achieving good nitrogen removal efficiency. The study also revealed the positive role of the Sulfammox process in nitrogen and sulfur removal, and identified the bacteria associated with this process through high-throughput analysis.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Tatsuru Kamei, Suphatchai Rujakom, Mai Nakano, Amit Kumar Maharjan, Futaba Kazama
Summary: This study investigated the suitable operational condition for NO2--N accumulation by hydrogenotrophic denitrification (HD) in the PDA process. It was found that minimizing the H-2 flow rate and providing intermittent hydrogen supply could achieve nitrite accumulation and improve the treatment efficiency of wastewater containing low NH4+N concentration.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Yufeng Zheng, Youliang Zhang, Ni An, Liangliang Shi, Yan Wei, Bin Ma
Summary: Granule-based partial denitrification and anammox (PDA) process is influenced by microbial community. It was found that the nitrogen conversion rate is affected by granule size through microbial composition. The abundance of anammox bacteria increased with particle size, while the abundance of denitrifiers decreased and then increased. The microbial composition also affected nitrogen removal and nitrite accumulation in the granules.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Agricultural Engineering
Yihui Liu, Yingmu Wang, Gongduan Fan, Xiaoxuan Su, Jian Zhou, Deming Liu
Summary: In this study, a thiosulfate-driven denitratation system was successfully established with high nitrite accumulation efficiency. Thiosulfate preferred the reduction of nitrate over nitrite, but after depletion, sulfur served as the main electron donor favoring nitrite reduction and constraining nitrite accumulation. Metagenomic sequencing identified key microbe species and metabolic pathways contributing to high NAE in the TDD system.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Qiongpeng Dan, Rui Du, Tong Wang, Tiantian Sun, Xiyao Li, Qiong Zhang, Yongzhen Peng
Summary: This study evaluated the feasibility of using endogenous partial denitratation (EPD) as a solution for the instability of the partial nitritation-anammox (PNA) process. By increasing the aeration rate to simulate the instability, the undesired NO2-/NH4+ ratio and nitrate accumulation were obtained. However, a high nitrogen removal efficiency was maintained due to the significant increase in anammox contribution. Coupling EPD with anammox has great potential as a remediation strategy for the unstable mainstream PNA process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Lan Lin, Zibin Luo, Yanlong Zhang, Yuanyuan Ren, Yu-You Li
Summary: This study successfully initiated the PD-anammox process by using high-strength anammox granules as seed sludge. The continuous operation achieved efficient nitrogen removal and stable PD-anammox relationship. The enrichment of PD bacteria and the abundance of dominating anammox bacteria were also relatively high in this process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Green & Sustainable Science & Technology
Parin Izadi, Pooja Sinha, Mehran Andalib, Caroline Samberger, Geno Lehman, Katerina Messologitis, Joseph Jacangelo
Summary: In recent years, wastewater treatment plants have been challenged to adopt innovative processes due to nutrient management and stringent regulatory limits. The Partial Denitrification Anammox (PDNA) process has successfully transitioned from pilot scale to full-scale within a short period of time, offering a sustainable solution with significant savings in carbon, energy, and footprint. This review examines the recent advances in the PD process and its coupling to the anammox process, analyzing the fundamental mechanisms and operational strategies responsible for stable PDNA process. It also highlights the importance of controlling nitrate to nitrite conversion and the neglected significance of operational factors such as bacterial ecology shift, C/N ratio, SRT decoupling, and feast-famine conditions in achieving stable PDNA process.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Agricultural Engineering
Yitong Liang, Zemin Li, Bin Zhang, Yushen Zhang, Sijia Ji, Guanglei Qiu, Haizhen Wu, Chaohai Wei
Summary: This study investigated the effects of NO-2 on the synergistic interactions between Anammox bacteria (AnAOB) and sulfur-oxidizing bacteria (SOB) in an autotrophic denitrification-Anammox system. The presence of NO-2 was shown to enhance NH+4 and NO-3 conversion rates, intensifying the synergy between AnAOB and SOB. However, excessive NO-2 inhibited the cooperation between AnAOB and SOB, leading to decreased conversion rates.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Qiongpeng Dan, Rui Du, Tong Wang, Tiantian Sun, Honggui Han, Xiaorong Zhu, Xiyao Li, Qiong Zhang, Yongzhen Peng
Summary: A hybrid system of anammox combined with heterotrophic endogenous metabolisms was developed in a single-stage bioreactor to treat real domestic wastewater. Nitrogen removal was achieved at a low carbon to nitrogen ratio and maintained under an extremely low ratio. The coexistence and enrichment of different bacteria contributed to the co-metabolism of carbon, nitrogen, and phosphorus.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Agricultural Engineering
Ruitao Gao, Yongzhen Peng, Jianwei Li, Qiong Zhang, Xiyao Li, Liyan Deng, Wenyu Li, Chengkun Kao
Summary: The study confirmed that the PN/A-PD/A process with partial anammox, spatially coupled with partial nitrification and partial denitrification via oxic/anoxic distribution with step feed mode, is an alternative for application of mainstream anammox in municipal wastewater treatment. The process achieved stable nitrogen loss, improved anammox activity, and increased abundance on the biocarriers.
BIORESOURCE TECHNOLOGY
(2021)