Article
Chemistry, Inorganic & Nuclear
Wei Feng, Guoping Hu, Eric F. May, Gang Kevin Li
Summary: This study evaluated two methods for synthesizing zeolite from CFBFA and optimized the synthesis conditions. The low-temperature hydrothermal method resulted in a mixture of zeolites A and X, while the alkali fusion followed by hydrothermal method produced high-quality pure phase zeolite A.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Energy & Fuels
Bin Liang, Haolong Bai, Bo Tan, Liangliang Fu, Dingrong Bai
Summary: To solve the issue of burning wet coal slime in circulating fluidized bed (CFB) boilers, a proposal is made to dry coal slime in a low-temperature drying system and burn the dried fine powders in a CFB with a highly efficient separator. Experimental results show that the dried slime particles can be burned stably, efficiently, and cleanly with a particle size distribution similar to that of circulating ash particles. This study presents a potential opportunity to advance CFB combustion technology.
Article
Engineering, Chemical
Jun Xie, Wenqi Zhong, Yingjuan Shao, Guanwen Zhou
Summary: A comprehensive three-dimensional model based on multiphase particle-in-cell approach has been developed to simulate the co-gasification process of coal and wood in a dual fluidized bed system. The study shows that increasing coal ratio accelerates steam gasification, leading to higher H-2 and CO concentrations in the product gas, while the tar content decreases and emissions of NH3 and H2S increase.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Thermodynamics
Zhaozhi Li, Yingjuan Shao, Wenqi Zhong, Hao Liu
Summary: This study focuses on the optimal design of the supercritical CO2 Brayton cycle for oxy-coal power plants, which has not received much attention in research. A novel triple recompression sCO2 cycle and a new sCO2 oxy-coal CFB boiler configuration were proposed and evaluated. The results showed that the novel configuration and triple recompression cycle could increase system efficiency by about 1.4% points compared to the basic system.
Article
Thermodynamics
Mengmeng Zhou, Shuai Wang, Kun Luo, Jianren Fan
Summary: In this study, the co-firing of biomass and coal in an oxy-fuel bubbling fluidized bed combustor was investigated using numerical simulations. The results revealed the effects of solid fuel injection and gas flow on gas-solid fluxes and gas product distributions.
Article
Chemistry, Applied
Xinglei Qiu, Yueming Wang, Zhengang Zhou, Yuanqiang Duan, Lunbo Duan
Summary: Pressurized fluidized bed oxy-fuel combustion is considered a promising clean coal technology for CO2 capture. This study investigated the particulate matter formation under pressurized conditions and found that the concentration of PM1 in oxy-fuel combustion was higher than in air combustion, but the difference decreased with increasing pressure. Additionally, elevated pressure reduced the concentration of PM1 while increasing the concentration of PM1-10.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Yong Wei, Guijian Liu, Biao Fu, Ruwei Wang, Yuan Liu, Xuan Xue, Mei Sun
Summary: This study evaluated the distribution and partitioning behavior of Pb in size-resolved fine PM collected from an industrial circulating fluidized bed power plant. The mechanism of Pb enrichment in supermicron particles was mainly controlled by surface adsorption reaction, while gas-film transfer or heterogenous condensation might represent the deposition mechanism for submicron particles. Additionally, the emission of fine SiO2-bearing particles should be limited due to their potential harm to the respiratory system.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Multidisciplinary
Zehua Li, Renjie Zou, Yang Xu, Liang Cao, Guangqian Luo, Hong Yao
Summary: The study utilized a self-designed micro fluidized bed reactor and an online char particle sampling system to investigate the kinetics of coal char combustion and gasification. It was found that the reactivity of sampled char in oxy-fuel combustion followed a specific trend with sampling time, while the gasification reactivity increased gradually with sampling time.
Article
Green & Sustainable Science & Technology
Jicheng Hui, Shujun Zhu, Xiaoyu Zhang, Yuhua Liu, Jiangong Lin, Hongliang Ding, Kun Su, Xiaoyang Cao, Qinggang Lyu
Summary: The deep and flexible load regulation characteristics of pulverized coal preheating combustion are explored, showing a wide load range and stable operation. Thermal modification enhances the chemical reactivity of pulverized coal and ensures stable combustion at ultralow loads. Excessively high load steps trigger combustion hysteresis and hampers the variable load process.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Shujun Zhu, Jicheng Hui, Qinggang Lyu, Ziqu Ouyang, Jingzhang Liu, Jianguo Zhu, Xiongwei Zeng, Xiaoyu Zhang, Hongliang Ding, Yuhua Liu, Jiahang Zhang
Summary: This study examines the low-load operation and rapid load-change characteristics of pulverized coal combustion on a 1 MWth test platform, and verifies the feasibility of peak shaving for coal-fired power generation.
Article
Thermodynamics
Miao Miao, Boyu Deng, Hao Kong, Hairui Yang, Junfu Lyu, Xiaoguo Jiang, Man Zhang
Summary: This paper explores the combustion characteristics of different types of coal under various oxygen concentrations in a fluidized bed reactor. It found that factors such as bed temperature, oxygen concentration, and coal type significantly affect combustion characteristics, with coals high in volatile matter exhibiting more obvious separated combustion phenomena.
Article
Thermodynamics
Taewoo Kim, So Dam Park, Uen Do Lee, Byeong Cheol Park, Kyoung Il Park, Jongsup Hong
Summary: The proposed 2nd generation hybrid pressurized oxy-coal combustion power cycle combines fluidized-bed combustion with the Rankine cycle and gasification with the Brayton cycle, leading to an improved efficiency and performance of the system.
Article
Energy & Fuels
Zhichao Chen, Jiawei Li, Shuo Guan, Yanyu Qiao, Zhenhua Yuan, Lingyan Zeng, Zhengqi Li
Summary: The study calculated the activation energy of different samples using model-free and model methods, showing that dry ash (DA) has better combustion performance compared to Yangquan anthracite, while water scrubbing ash (WSA) performs similarly to lean coal. Comprehensive analysis of combustion characteristics and gas emissions suggests that CGFA has combustibility and utilization value.
Article
Thermodynamics
Xiangxin Han, Zheng Gao, Honglei Mao, Jianguo Liu, Xiumin Jiang
Summary: This study verified the self-sustained combustion performance of coal slime in a 12t/h fluidized bed boiler and analyzed the properties of the ash released from the boiler. High combustion efficiency of about 99% and low gaseous pollutants emissions can be achieved by adjusting the structure of the fluidized bed boiler and humidification pretreatment of coal slime. A co-generation system was proposed to effectively utilize the extra thermal energy generated by the boiler.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Energy & Fuels
Imtenan Sayeed, M. A. Kibria, Sankar Bhattacharya
Summary: This paper studied the gasification kinetics of Victorian brown coal in a fluidized bed reactor simulating the conditions of a chemical looping combustion process. The experiments showed that the reaction rate in hematite bed was 42% faster compared with the reaction in a sand bed, with a total conversion time as low as 4.1 minutes at 950 degrees C. The increase in CO2 partial pressure at the vicinity of char particle was found to enhance the reaction rate in the case of hematite bed.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Environmental Sciences
Elizabeth Alvarez-Chavez, Stephane Godbout, Mylene Genereux, Caroline Cote, Alain N. Rousseau, Sebastien Fournel
Summary: This study evaluated the effect of alternative filtering materials and bed aeration on the retention of nutrients and fecal bacteria in woodchip bedded stand-off pads for cows. The results showed that the alternative biofilters were more efficient in removing COD, SS, TN, and NO3-N, while conventional biofilters were more efficient for PO4-P removal. Aeration did not have a significant effect under the tested temperature conditions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yike Zhang, Zengyi Ma, Zhuoting Fang, Yuandong Qian, Zhiping Huang, Yilong Ye, Jianhua Yan
Summary: This study investigates the application of oxygen enrichment melting technology in the melting of municipal solid waste incineration fly ash. The results demonstrate that oxygen enrichment technology can reduce energy consumption and operating costs, as well as decrease pollution emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Liangang Xiao, Mingkai Leng, Philip Greenwood, Rongqin Zhao, Zhixiang Xie, Zengtao You, Junguo Liu
Summary: This study investigates the effects of grazing exclusion on soil organic carbon (SOC) accumulation and vegetation recovery. It finds that grazing exclusion can increase the potential for SOC accumulation, and higher annual precipitation is positively correlated with SOC accumulation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Beatrice Cantoni, Jessica Ianes, Beatrice Bertolo, Selena Ziccardi, Francesco Maffini, Manuela Antonelli
Summary: This study evaluates the performance of ozonation and adsorption as in-series processes compared to standalone processes for the removal of Contaminants of Emerging Concern (CECs) in drinking water. The combination of both processes proves to be more effective than adsorption and ozonation alone. Ozonation improves the adsorption performance of poorly-oxidizable CECs but worsens that of well-oxidizable compounds. This research highlights the importance of considering both processes in the removal of CECs in drinking water treatment plants.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Dan Li, Bingjun Liu, Yang Lu, Jianyu Fu
Summary: A new Standardized compound Drought and Saltwater intrusion Index (SDSI) was developed to detect changes in the severity of CDSEs in six estuaries. The study found that saltwater intrusion plays a dominant role in influencing SDSI severity, and CDSEs vary in frequency, duration and severity among different estuaries.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yong-Qiang Li, Rui Sun, Chong-Miao Zhang, Zi-Xuan Liu, Rui-tao Chen, Jian Zhao, Hua-dong Gu, Huan-Cai Yin
Summary: In this study, an electron beam excitation multi-wavelength ultraviolet (EBE-MW-UV) system was established and found to have significantly higher microbial inactivation effects compared to single-wavelength UV-LEDs in water. Mechanism analysis revealed that EBE-MW-UV damaged microbial DNA and proteins, and generated additional reactive oxygen species, leading to microbial inactivation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Kaili Ma, Xinxin Han, Qiujuan Li, Yu Kong, Qiaoli Liu, Xu Yan, Yahong Luo, Xiaopin Li, Huiyang Wen, Zhiguo Cao
Summary: This study reveals that the use of a tryptophan-degrading microbial consortium (TDC) can enhance the hydrolysis efficiency of waste activated sludge (WAS), increasing the yield and quality of short chain fatty acids (SCFAs) and improving the solubilization and release of organic substances from WAS.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Ling Xiong, Rui Li
Summary: Incorporating Ecosystem Service Value (ESV) into land use planning can provide informed land management decisions. This study evaluates the ESV of Guizhou Province in China's karst region. The results show an increase in total ESV over the past two decades due to ecological restoration projects.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
M. Geetha Jenifel
Summary: This article discusses the importance of water and the pollution of freshwater resources, and introduces the use of machine learning models and blockchain technology to predict and protect water quality.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Stanslaus Terengia Materu, Taotao Chen, Chang Liu, Daocai Chi, Meng Jun
Summary: The study showed that H2SO4-modified biochar can reduce P leaching, increase soil available P, and enhance plant P uptake in alternate wetting and drying irrigation systems. Biochar additions B20A and IAWDB20A-M were effective in improving yield, reducing P leaching, and increasing APB.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Amir Nouri, Ali Akbar Zinatizadeh, Sirus Zinadini, Mark Van Loosdrecht
Summary: This study focuses on the development of an air-lift bio-electrochemical reactor (ALBER) with a continuous feeding regime to enhance nitrogen removal from synthetic wastewater. The effect of temperature, hydraulic retention time (HRT), N -NH+4 /TN ratio, and current density on the reactor performance was investigated, and the ALBER achieved a maximum TN removal of 73%. The results suggest that the ALBER has potential for treating industrial wastewater at low temperatures.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Peifang Wang, Guoxiang You, Yang Gao, Juan Chen, Xun Wang, Chao Wang
Summary: This study investigated the ecological processes of microbial communities and N- and P-transformation processes in multistage agricultural drainage ditches. The results showed that the microbial communities were co-shaped by agricultural practices and ditch size, which further governed the N and P removal performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Xiaofeng Niu, Huan Wang, Tao Wang, Peiyu Zhang, Huan Zhang, Hongxia Wang, Xianghong Kong, Songguang Xie, Jun Xu
Summary: Microorganisms play a critical role in maintaining ecosystem balance, and environmental stressors can affect the assembly processes of microbial communities. The study found that different stressors have opposite effects on microbial community assembly in water and sediment, and warming has different influences compared to herbicides and nutrients.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yuqing Tan, Qiming Cheng, Fengwei Lyu, Fei Liu, Linhao Liu, Yihong Su, Shaochun Yuan, Wenyu Xiao, Zhen Liu, Yao Chen
Summary: The exacerbation of global warming, extreme weather events, and rapid urbanization have led to increased flooding in urban areas. China has adopted sponge city as an efficient means of preventing and controlling urban floods. Using a SWMM-FVCOM model, the hydrological reduction and control effect of sponge city construction (SPCC) within a university campus were evaluated. The study found that implementing SPCC effectively mitigates surface runoff and reduces the severity of urban flooding. However, the efficacy of runoff control decreases with longer rainfall return periods.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Zhonghan Chen, Qiuyan Li, Shibo Yan, Juan Xu, Qiaoyun Lin, Zhuangming Zhao, Ziying He
Summary: Tidal rivers are important biochemical reaction channels, receiving carbon from wastewater and agricultural drains, affecting CO2 emissions. Through modeling and data analysis, researchers explored carbon distribution, emissions, and greenhouse effects, emphasizing the potential of river management to change global CO2 emissions under climate change.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)