Article
Engineering, Environmental
Hoang Phuc Trinh, Sang-Hoon Lee, Garam Jeong, Hyeokjun Yoon, Hee-Deung Park
Summary: Mainstream anammox processes face challenges such as difficulty in out-selection of nitrite-oxidizing bacteria, high organic carbon to nitrogen ratio, retention of anammox bacteria, and influence of high concentrations of ammonia and nitrite compounds. Efficient strategies are necessary to manage high carbon to nitrogen ratios, improve performance in low-intensity wastewater, and retain anammox bacteria for widespread application in full-scale WWTPs. Key elements in the design, operation, and maintenance of mainstream anammox processes in full-scale WWTPs are also suggested.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Rahil Fofana, Michael Parsons, Megan Bachmann, Kimberly Jones, Jeseth Delgado Vela, Benay Akyon, Wenjun Liu, Stephanie Klaus, Christine deBarbadillo, Charles Bott, Haydee De Clippeleir
Summary: Partial denitrification-anammox (PdNA) technology has the potential to improve nitrogen removal efficiency and reduce costs. The study found that methanol is the preferred carbon source due to its higher PdNA efficiency and rate. However, achieving low effluent total nitrogen limits in PdNA filters primarily depends on the appropriate ratio of ammonium to NOx in the upstream activated sludge.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Xiaojing Zhang, Nan Zhang, Denghui Wei, Hongli Zhang, Yali Song, Yongpeng Ma, Hongzhong Zhang
Summary: The study found that the antibiotic sulfamethoxazole had a slight inhibitory effect on the Anammox process, but denitrification could be induced to help the Anammox community resist the biotoxicity, thus improving total nitrogen removal efficiency.
BIOCHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Xin Xin, BaiXue Li, Xin Liu, Wenyu Yang, Qin Liu
Summary: In this study, a novel coupling process (SAPD-A) combining sulfide autotrophic partial denitrification (SAPD) and anaerobic ammonium oxidation (Anammox) was developed using an anaerobic sequencing batch reactor (ASBR). The process consisted of two stages, with the SAPD process successfully started by gradually increasing the inflow of nitrate and sulfide. The SAPD-A process achieved high removal efficiencies of nitrate, ammonium, and total nitrogen, and was dominated by Anammox for nitrogen removal.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Microbiology
Samuel J. Bryson, Kristopher A. Hunt, David A. Stahl, Mari-Karoliina H. Winkler
Summary: This study investigated the differences in microbial community structure and nitrogen transforming functions under one-stage and two-stage reactor configurations. It was found that oxygen availability and gradient in one-stage systems provided a larger niche space for heterotrophic populations compared to the homogeneous anoxic environment in two-stage systems, impacting the competition for carbon substrates between denitrifying and DNRA heterotrophs.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Dandan Zhang, Mingyue Li, Yuchun Yang, Huang Yu, Fanshu Xiao, Chengzhi Mao, Jie Huang, Yuhe Yu, Yunfeng Wang, Bo Wu, Cheng Wang, Longfei Shu, Zhili He, Qingyun Yan
Summary: The anaerobic microbial nitrogen removal process in lake sediments is an important part of the nitrogen cycling in lake ecosystems. However, the mechanisms regulated by denitrifying and anaerobic ammonia oxidation bacteria in lake sediments are not well understood. This study examined the denitrifying and anammox bacterial communities in Lake Donghu sediments and found that the concentrations of NO(3)(-) and NO2-, as well as Nar enzyme activity, were key factors affecting these communities. The enrichment experiments confirmed the divergence of denitrification and anammox rates with the addition of NO2-. The study advances our understanding of the mechanisms driving denitrification and anammox in lake sediments and provides new insights into coupled denitrification-anammox nitrogen removal in eutrophic lake ecosystems.
Article
Geosciences, Multidisciplinary
Will A. Overholt, Susan Trumbore, Xiaomei Xu, Till L. Bornemann, Alexander J. Probst, Markus Krueger, Martina Herrmann, Bo Thamdrup, Laura A. Bristow, Martin Taubert, Valerie F. Schwab, Martin Hoelzer, Manja Marz, Kirsten Kuesel
Summary: The terrestrial subsurface contains most freshwater reserves and prokaryotic biomass. A study estimated carbon fixation rates in a carbonate aquifer using a C-14-labelling technique and found similarities to those in oligotrophic marine surface waters. The study suggests the importance of in situ carbon fixation in subsurface ecosystem processes.
Article
Environmental Sciences
Yahua Wang, Ying Meng, Fubo Luan
Summary: This study achieved high loading start-up and rapid loading increase in an up-flow anaerobic sludge bed reactor using anammox granules. The loading rapidly reached 38.0 kg-N m(-3) day(-1) within 44 days. The study also provides a potential strategy for obtaining superior anammox granules with robust removal efficiency.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Engineering, Environmental
Dawoon Jeong, Hyunman Lim, Weonjae Kim
Summary: This study investigated a combined partial nitritation and anammox process for treating low-strength ammonia synthetic wastewater at 20 degrees C. Limited dissolved oxygen concentrations suppressed nitrite-oxidizing bacteria activity, but an undesired nitrite oxidation rate was observed at 20 degrees C.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Jing Ding, Wanyi Seow, Jizhong Zhou, Raymond Jianxiong Zeng, Jun Gu, Yan Zhou
Summary: This study found that Fe(II) has both enhancing and inhibiting effects on the anammox process and bacterial growth. Fe(II) at concentrations of 0.09 and 0.12 mmol/L can enhance anammox activity, while 0.75 mmol/L Fe(II) inhibits the activity with recoverable inhibition.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
Article
Environmental Sciences
Xiangyu Lin, Bolin Li, Mengyuan Tian, Xiang Li, Jun Wang
Summary: Using microbial immobilization technology to fix anaerobic ammonia oxidizing bacteria (AAOB) and sulfur oxidizing bacteria (SOB) on a polyvinyl alcohol-sodium alginate composite carrier can improve the nitrogen removal performance in low temperature environments. The gel provides insulation and enhances the low temperature resistance of internal sludge, protecting AAOB and SOB from oxygen inhibition and promoting the enrichment of denitrifying bacteria. The gel does not change the internal sludge species but can improve nitrogen removal efficiency by shifting the dominance of specific microorganisms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Xiang Li, Yan Yuan, Yong Huang
Summary: Partial nitrification (PN)-Anammox is considered the optimal nitrogen removal process for municipal sewage, but NOB growth under low temperature and low-ammonium conditions leads to excessive NO3--N production. The cyclic utilization of Fe2+/Fe3+ in Feammox and NDAFO processes can achieve continuous conversion of NH4+-N and NO3--N without sludge mineralization. Coupling Feammox and NDAFO with Anammox enhances the conversion of NH4+-N to N-2.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Weihua Zhao, Meixiang Wang, Meng Bai, Zhaoshuo Tian, Shanyun Wang, Zhongwei Wang
Summary: In this study, DEAMOX technology was successfully applied in an A/O-SBBR system to improve nitrogen removal from real low-carbon/nitrogen domestic wastewater. Excellent nitrification performance was achieved in the N-SBBR, while DEAMOX was achieved in the An-SBBR. The addition of anammox bacteria resulted in an improvement in total inorganic nitrogen removal efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Vojtech Kouba, Kamila Hurkova, Klara Navratilova, Dana Kok, Andrea Benakova, Michele Laureni, Patricie Vodickova, Tomas Podzimek, Petra Lipovova, Laura van Niftrik, Jana Hajslova, Mark C. M. van Loosdrecht, David Gregory Weissbrodt, Jan Bartacek
Summary: In the study of the performance of anammox reactions under low-temperature conditions, membrane composition and cultivation temperature were found to be closely related to the activity of anammox biomasses. The adaptation of mesophilic cultures to low-temperature conditions may take several months or even up to 5 years. An interesting finding in these studies is that biomass enriched in the marine genus Candidatus Scalindua showed outstanding potential for nitrogen removal from cold streams.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Jonathan A. C. Roques, Federico Micolucci, Suguru Hosokawa, Kristina Sundell, Tomonori Kindaichi
Summary: Recirculating aquaculture systems (RAS) are promising for sustainable aquaculture development, but nitrogenous waste accumulation is a limitation. The anammox process shows potential for treating marine wastewater, with marine anammox bacteria Candidatus Scalindua as a promising candidate. However, anammox activity is affected by unknown compounds in RAS wastewater and/or sub-optimum trace elements content, and TE supplementation can help recover activity. Future studies need to identify the unknown factors and determine specific TE requirements for optimal RAS wastewater treatment by Candidatus Scalindua.
Article
Engineering, Environmental
Pinjie Su, Jing Wang, Dan Zhang, Kuo Chu, Yanzhong Yao, Qiqi Sun, Yifu Luo, Runjie Zhang, Xuping Su, Zichao Wang, Naishun Bu, Zhaolei Li
Summary: This study conducted a meta-analysis of 80 published studies to quantify the cascading responses of soil animal traits to microplastics. The results showed that microplastics exposure increased reactive oxygen species (ROS) and antioxidant enzyme activities in soil animals, but the antioxidant responses were not sufficient to eliminate the increased ROS. As a result, animal traits at behavioral and survival levels were significantly decreased.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Ting Zhao, Congke Miao, Jing Wang, Pinjie Su, Kuo Chu, Yifu Luo, Qiqi Sun, Yanzhong Yao, Youtao Song, Naishun Bu
Summary: This study analyzed over 2600 terrestrial nature reserves in mainland China at the provincial level and found that natural factors and anthropogenic activities have different influences on the geographical distribution of the nature reserves. Natural factors determine the general layout of the reserves, while human activities make the distribution patchy.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Yanzhong Yao, Yunpeng Sun, Xinruo Wang, Youtao Song, Zichao Wang
Summary: This study investigates the performance of sludge reduction through hydrodynamic cavitation (HC). The results show that HC treatment can decrease the concentrations of mixed liquor suspended sludge (MLSS) and mixed liquor volatile suspended solids (MLVSS), while promoting the solute chemical oxygen demand (sCOD) concentration and disintegration degree (DDsCOD) of sludge. HC treatment also leads to changes in particle size distribution and protein composition of sludge.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Biodiversity Conservation
Wencong Yue, Yanzhong Yao, Meirong Su, Qiangqiang Rong, Chao Xu
Summary: A hybrid approach was used to identify future heterogeneity of urban ecosystem health (UEH) in cities. Multiple driving factors of UEH scores were considered, and the contribution of main indicators was determined. A case study in Dongguan City of China revealed that UEH scores would increase in the future, influenced by socio-economic development and ecological function. Heterogeneity of UEHRs and the synergy of land-use and economic growth were important factors affecting spatial variations of UEH scores.
ECOLOGICAL INDICATORS
(2023)
Article
Soil Science
Yanzhong Yao, Youtao Song, Pinjie Su, Jing Wang, Congke Miao, Yifu Luo, Qiqi Sun, Jiale Wang, Guohui Zhang, Naishun Bu, Zhaolei Li
Summary: Plant invasion leads to increased emissions of methane and nitrous oxide, and the impact on soil functional microbes that control these emissions is not well understood. A meta-analysis of 112 published papers revealed that both methane and nitrous oxide emissions increased under plant invasion, with the increases being greater over time. The abundance of soil functional microbes involved in methane and nitrous oxide production increased, while those involved in methane and nitrous oxide consumption decreased. This study highlights the important role of soil functional microbes in regulating methane and nitrous oxide emissions under plant invasion and challenges the long-term estimation of ecosystem warming potential.
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Article
Ecology
Bingbing Han, Yanzhong Yao, Yini Wang, Xiaoxuan Su, Lihua Ma, Xinping Chen, Zhaolei Li
Summary: This study investigates the factors influencing the accumulation of microbial necromass carbon and finds that soil properties and biotic factors are the major controls.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2023)