Review
Soil Science
Wenlong Gao, Changhua Fan, Wen Zhang, Ning Li, Huiran Liu, Miao Chen
Summary: In this review, the mechanisms and modulations of microbial-driven heterotrophic nitrification of organic nitrogen (O-HORG) in soil are discussed. Various factors such as pH, carbon and nitrogen contents can affect the occurrence and pathways of O-HORG. It is important to understand the role of heterotrophic nitrification in soil ecosystems and develop reliable measurement methods for its activity.
BIOLOGY AND FERTILITY OF SOILS
(2023)
Article
Environmental Sciences
Shu Ma, Shiwei Huang, Yun Tian, Xiangyang Lu
Summary: In this study, a strain of Rhodococcus erythropolis Y10 capable of aerobic denitrification was screened from surface flow constructed wetlands. The strain removed ammonium through heterotrophic ammonium assimilation and exhibited improved aerobic denitrification efficiency when ammonium was added. The findings shed light on the role of ammonium assimilation in microbial ammonium removal.
Article
Environmental Sciences
Junli Chen, Juan Xu, Shunan Zhang, Feng Liu, Jianwei Peng, Yingxiang Peng, Jinshui Wu
Summary: WT14, a newly isolated strain of Alcaligenes faecalis, showed promising nitrogen removal efficiency, with the ability to efficiently remove ammonium nitrogen under specific environmental conditions and exhibit strong tolerance and rapid multiplication. It also demonstrated high nitrate or nitrite removal capacity when provided as the sole nitrogen source, setting it apart from other Alcaligenes faecalis species. Further studies on the nitrogen removal pathway of WT14 are warranted.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Agricultural Engineering
Mei-Qi Huang, You-Wei Cui, Hou-Jian Yang, Meng-Jiao Xu, Yubo Cui, Zhaobo Chen
Summary: In this study, a halophilic strain SND-01 capable of aerobic-heterotrophic nitrogen removal (AHNR) was isolated from saltern sediment. The strain exhibited high efficiency in removing ammonium, nitrite, and nitrate from high-salinity wastewater. Various functional genes related to N metabolism were found in the strain's genome, establishing a complex AHNR pathway. The strain showed high adaptability under different conditions, making it suitable for treating saline wastewater with different N compositions.
BIORESOURCE TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Xinjie Lv, Xiao-li Zhao, Qixin Zhao, Qi Zheng, Weimin Xuan
Summary: Two cerium-oxo clusters (COCs) 1 and 2 with spherical structures resembling fluorite phase CeO2 have been constructed by self-assembly of cerium ions and carboxylate ligands. Among them, 1 exhibits high activity and selectivity for the photocatalytic aerobic oxidation of sulfides to sulfoxides based on the switch between the Ce(IV/III) redox couple.
DALTON TRANSACTIONS
(2022)
Article
Microbiology
Liping Wang, Zongze Shao
Summary: In this study, 14 strains capable of aerobic denitrification and heterotrophic sulfur oxidation were isolated and identified as six novel species of the genus Halomonas. Through phenotypic, genotypic, and chemotaxonomic analyses, these strains' significant role in the nutrient cycle was highlighted.
FRONTIERS IN MICROBIOLOGY
(2021)
Review
Biotechnology & Applied Microbiology
Aakanksha Rampuria, Niha Mohan Kulshreshtha, AkhilendraBhushan Gupta, Urmila Brighu
Summary: Traditional nitrogen transformation processes in constructed wetlands involve aerobic nitrification and anoxic denitrification, but recent research has discovered novel pathways like anaerobic ammonium oxidation, heterotrophic nitrification, and aerobic denitrification, which can be enhanced by enriching specialized bacteria through selection pressures. Understanding these novel pathways and associated microbial populations can provide new insights for designing constructed wetlands for enhanced nitrogen removal.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2021)
Article
Environmental Sciences
Maoyuan Yang, Youqi Tao, Die Liang, Liurui Peng, Yuecheng He, Wenlai Xu
Summary: Pseudomonas otitidis YM-01, isolated from swine wastewater, exhibits efficient simultaneous nitrification and denitrification ability using both single and mixed nitrogen sources. High concentrations of free ammonia (FA) degrade the extracellular polymeric substances (EPS), leading to the loss of protective activity for enzymes involved in denitrification. The strain YM-01 shows potential for application in high-strength ammonium wastewater, as demonstrated by its removal rates of 70.24% and 27.84% for FA concentrations of 55 mg/L and 209 mg/L, respectively.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Environmental Sciences
Zhengyu Ji, Liyun Zhang, Yuanwang Liu, Xiaqing Li, Zhaojun Li
Summary: This study investigated the optimal range of startup parameters and practical criteria for manure composting maturity, as well as the effectiveness of in situ technologies in enhancing composting maturity. The study proposed a maturity assessment standard for animal manure composting and identified effective strategies for improving compost maturity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Agricultural Engineering
Youcai Zhou, Yongjin He, Xuehua Xiao, Zhibo Liang, Jingxuan Dai, Mingzi Wang, Bilian Chen
Summary: This study established a method for treating rare earth elements (REEs) wastewater rich in ammonium sulfate (AS) using two heterotrophic Chlorella species, showing promising results in NH4+-N and SO42- removal. The process performed similarly well when eggshell powder (ESP) and oyster shell powder (OSP) were used as substitutes for CaCO3. Experimental data obtained from a 10-L fermenter confirmed the effectiveness of the developed kinetic models in modeling the treatment process.
BIORESOURCE TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Ping Zhu, Yilin Shen, Xusheng Pan, Bin Dong, John Zhou, Weidong Zhang, Xiaowei Li
Summary: Aerobic composting is an effective technology for treating human and animal feces and converting them into resources, but odor emissions in compost pose environmental problems and reduce compost quality. This review discusses recent progresses and strategies for odor mitigation in feces composting, highlighting the importance of choosing appropriate additives based on the specific situation. Further research is needed to improve odor mitigation and element retention in feces compost.
Article
Agricultural Engineering
Dong Xie, Ming Gao, Min Yang, Mingyue Xu, Jie Meng, Chuanfu Wu, Qunhui Wang, Shu Liu
Summary: The study found that using STL as a moisture conditioning agent during thermophilic composting can increase the nitrogen content of compost, promote the hydrolysis and mineralization of organic matter, and improve the quality of compost without additional greenhouse gas emissions.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Silisti Karuriya, Sangeeta Choudhary
Summary: A strain of Paenibacillus sp. isolated from a lignite mine waste site in Rajasthan, India, was found to be efficient in simultaneous nitrification and denitrification, with a high nitrogen removal rate. The presence of genetic determinants related to these processes was confirmed, suggesting a potential application of this strain in wastewater treatment.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Yi Zhao, Weiguang Li, Li Chen, Yujie Zhou
Summary: A thermotolerant strain Brevibacillus Agri N2 isolated from sewage sludge composting exhibited efficient heterotrophic nitrification capability under high-temperature conditions, utilizing various nitrogen sources with minimal nitrogen loss. The detection of key enzymes and genes provided evidence of its nitrification ability, indicating its potential for practical application in reducing nitrogen loss during sewage sludge composting.
ENVIRONMENTAL RESEARCH
(2022)
Article
Agricultural Engineering
Guoying Wang, Guoxue Li, Jiali Chang, Yilin Kong, Tao Jiang, Jiani Wang, Jing Yuan
Summary: The study revealed that composting sheep manure can effectively degrade antibiotics, leading to a significant increase in abundance of antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs). SulI and tetX were identified as the major ARGs that require attention, with Actinobacteria and Bacteroidetes potentially being the main host bacteria.
BIORESOURCE TECHNOLOGY
(2021)