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Sci Total Environ

Title:		Activating soil nitrification by co-application of peanut straw biochar and organic fertilizer in a rare earth mining soil
Author(s):		Wang M; Yang M; Fan T; Wang D; He J; Wu H; Si D; Wang M; Wu S; Zhou D;
Address:		"State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. Ministry of Environmental Protection of the People's Republic of China, Nanjing Institute of Environmental Sciences, Nanjing 210008, China. School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA. College of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. Electronic address: songwu@nju.edu.cn"
Journal Title:		Sci Total Environ
Year:		2023
Volume:		20230107
Issue:
Page Number:		161506 -
DOI:		10.1016/j.scitotenv.2023.161506
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"The intensive mining activities to extract rare earth elements from ion-adsorption rare earth deposits have introduced massive amounts of ammonium into the tailing soils in southern China. Compared to the ubiquitous soil nitrification in cropland, forest, and grassland soils, however, there is no feasible strategy to alleviate the ammonium contamination in tailing soil. Herein, the feasibility to remove ammonium by adding ammonium adsorbents (e.g., biochar, activated carbon, and zeolite), alkaline materials, and organic fertilizer to the rare earth mining soil was explored. The amendment of rice straw biochar, activated carbon, or zeolite in combination with CaCO(3) and organic fertilizer showed no significant effect on ammonium removal due to their limited capacity to elevate soil pH. However, the co-application of peanut straw biochar (PSBC), CaCO(3), and organic fertilizer activated both the ammonia volatilization and soil nitrification processes. Specifically, the three components functioned as follows: organic fertilizer supplied active ammonia-oxidizing bacteria (AOB); PSBC stimulated AOB proliferation by elevating soil pH above 7.75; CaCO(3) ameliorated soil acidity and reduced the lag time for activating soil nitrification. The soil ammonium removal and nitrate accumulation rates were positively correlated to the acid neutralization capacity of PSBC prepared at 400 degrees C-800 degrees C. The qPCR and microbial community analysis results indicated that Nitrosomonas europaea was the dominant AOB that was responsible for enhanced soil nitrification. Our findings pave the way for developing cost-effective strategies to remediate ammonium contamination in rare earth mining soils"
Keywords:		Soil Nitrification Charcoal/analysis Arachis Fertilizers/analysis Ammonia/analysis *Zeolites Mining *Ammonium Compounds Soil Microbiology Oxidation-Reduction Acid neutralization capacity Ammonium Biochar Nitrosomonas europaea Rare earth mining;
Notes:		"MedlineWang, Min Yang, Min Fan, Tingting Wang, Dengjun He, Jianzhou Wu, Haotian Si, Dunfeng Wang, Mei Wu, Song Zhou, Dongmei eng Netherlands 2023/01/11 Sci Total Environ. 2023 Mar 25; 866:161506. doi: 10.1016/j.scitotenv.2023.161506. Epub 2023 Jan 7"