Article
Engineering, Environmental
Amin Mojiri, John L. Zhou, Harsha Ratnaweera, Akiyoshi Ohashi, Noriatsu Ozaki, Yoshiteru Aoi, Mohammadtaghi Vakili, Tomonori Kindaichi
Summary: Anaerobic ammonia oxidation (anammox) is an environmentally friendly and cost-effective method for nitrogen treatment, but has drawbacks such as slow growth rate and negative effects of high concentrations of nitrite, ammonia, and other pollutants. This study found that attaching anammox to chitosan improved its performance, with the chitosan/anammox reactor showing better nitrogen removal efficiency compared to the sole anammox reactor. Additionally, the study demonstrated that chitosan not only enhanced nitrogen removal by anammox but also improved its resistance to metals.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Guifang Wang, Guangchuan Liang, Huizhen Xiao, Jun Qiu, Haiyan Liu, Shaojian Ma, Sridhar Komarneni
Summary: In this study, dynamic column simulation experiments were conducted to compare the immobilization persistence of heavy metals in sulfide tailings by the addition of triethylenetetramine modified montmorillonite (TTA-Mt) and calcium-based montmorillonite (Ca-Mt) during a simulated 5-year study of acid rain leaching. The results showed that TTA-Mt had superior environmental stability and could persistently immobilize heavy metal ions, while Ca-Mt had little effect.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Agricultural Engineering
Lan Yang, Yujie Qin, Xiangyin Liu, Zhiju Liu, Shaohong Zheng, Jiannv Chen, Siyuan Gong, Junfeng Yang, Tiansheng Lu
Summary: This study applied gel immobilization technology to the ASDAD coupling system and found that the optimal S2-/NO3- ratio was 0.6, resulting in the highest TN removal efficiency. Additionally, immobilized sludge cubes attenuated the effects of temperature on microorganisms.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Yunlong Su, Rui Du, Jiao Wang, Xiyao Li, Qiong Zhang, Xiaofei Xue, Yongzhen Peng
Summary: In this study, anammox bacteria were efficiently enriched and retained in a suspended sludge system for mainstream wastewater treatment. The system provided favorable conditions for the growth of anammox bacteria, including low nitrogen loading rate, low ammonia and nitrate concentrations, and anoxic environment. This research demonstrated the feasibility and potential of applying anammox technology without specific sludge seeding in mainstream wastewater treatment.
BIORESOURCE TECHNOLOGY
(2023)
Review
Engineering, Environmental
Yichen Wu, Yingxin Zhao, Yinuo Liu, Jiaojiao Niu, Tianyang Zhao, Xinhao Bai, Arif Hussain, Yu-You Li
Summary: This review systematically evaluates the toxicity of heavy metals on the anammox process and discusses the challenges and research gaps in overcoming their inhibition. It also proposes new recovery strategies and provides a new perspective on the recognition of heavy metal toxicity and mechanism in the anammox process.
Review
Engineering, Environmental
Qian Zhang, Ya-Fei Cheng, Bao-Cheng Huang, Ren-Cun Jin
Summary: This review summarizes the effect of different heavy metals on the treatment performance of anammox bioreactors and discusses the toxication mechanism and potential mitigation strategies. It provides valuable information for both scientific research and engineering application of anammox process in treating heavy metal containing wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
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
Agricultural Engineering
Hao Jiang, Zhong Wang, Shang Ren, Jingang Qiu, Qiong Zhang, Xiyao Li, Yongzhen Peng
Summary: Cell immobilization was used to enrich and retain functional bacteria within the partial denitrification-Anammox (PD/A) process, achieving fast start-up. The stable PD and satisfactory nitrogen removal rate were achieved even at low temperatures, with a high contribution from Anammox. Thauera and Candidatus Kuenenia abundance significantly increased during the process.
BIORESOURCE TECHNOLOGY
(2021)
Review
Environmental Sciences
Shenbin Cao, Rui Du, Yan Zhou
Summary: This study reviews the strategies to establish a competition balance between anammox and denitrification processes by analyzing the kinetics of anammox and denitrifying microorganisms, discussing the favorable conditions in establishing the coupled process, and evaluating the system recovery approaches. Additionally, the dynamics of the microbial communities in response to the organic matters are also presented.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Ehui Tan, Ting-Chang Hsu, Wenbin Zou, Xiuli Yan, Zhixiong Huang, Bin Chen, Yongkai Chang, Zhenzhen Zheng, Liwei Zheng, Min Xu, Li Tian, Shuh-Ji Kao
Summary: The study reveals that sedimentary denitrification is the main nitrogen removal pathway in estuarine environments, with a minor contribution from anammox. Estuarine sediments play a relatively weak role in eliminating nitrogen input, while the excess nitrogen from rivers will eventually be removed through various biological processes.
Article
Agricultural Engineering
Yueru Zhao, Qiong Zhang, Yi Peng, Yongzhen Peng, Xiyao Li, Hao Jiang
Summary: This study achieved efficient operation of Anammox treating low ammonia sewage through the PND-SAD process, with key measures including control of dissolved oxygen concentration and monitoring of nitrate concentration. In the system, the nitrite accumulation rate reached 97.6% and nitrogen removal efficiency was as high as 97.3%.
BIORESOURCE TECHNOLOGY
(2022)
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
Environmental Sciences
Jing Ma, Ziyi Hua, Sana Noreen, Zaffar Malik, Muhammad Riaz, Muhamamd Kamran, Shafaqat Ali, Mohamed S. Elshikh, Fu Chen
Summary: In recent years, industrial revolution and natural weathering processes have increased lead contamination in agricultural soils. This study shows that the application of chemically S-modified biochar (CSB) at a rate of 2% can significantly improve tomato growth by reducing the bioavailability of lead in Pb-contaminated soil.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Shan Gao, Xiong Yang, Yucheng Ding, Yihui Xia, Yumiao Song, Jiaying Liu, Kewu Pi, Andrea R. Gerson
Summary: In this study, a combination of electrokinetic and chemical immobilization was used to remediate Cd and Pb polluted river sediments. The immobilization ratios for Cd and Pb were achieved by adjusting the concentrations of the immobilization reagents and the applied voltage. The enhancement effect of the electric field is mainly due to the increased contact between the immobilization reagents and the heavy metals.
Review
Environmental Sciences
Saravanan Rajendran, T. A. K. Priya, Kuan Shiong Khoo, Tuan K. A. Hoang, Hui-Suan Ng, Heli Siti Halimatul Munawaroh, Ceren Karaman, Yasin Orooji, Pau Loke Show
Summary: Heavy metal pollution is a global environmental challenge that poses a significant threat to human life. Various methods have been explored to eliminate heavy metal pollutants from the environment, but are constrained by high expenses, processing duration, geological problems, and political issues. The immobilization of metals, phytoextraction, and biological methods have proven practical in treating metal contaminants from the soil.