Article
Energy & Fuels
Xuedong Gao, Qiyu Huang, Xun Zhang, Yu Zhang, Xiangrui Zhu, Jinxu Shan
Summary: In this study, the wax removal physics of foam pigs was experimentally investigated, and a five-phase description of wax resistive force was proposed; the effects of foam pig density, wax yield stress, and wax layer thickness on the wax removal efficiency were further discussed.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Applied
Weidong Li, Huiyuan Li, Hongju Da, Kai Hu, Yongjuan Zhang, Lin Teng
Summary: This study found that the addition of pour point depressants can significantly alter the properties of wax deposits, reducing the deposition rate, increasing the wax appearance temperature, and raising the wax content. Furthermore, the pour point depressants accelerate the aging process of deposits, leading to enriched heavy components of n-alkanes and diluted light components.
FUEL PROCESSING TECHNOLOGY
(2021)
Review
Energy & Fuels
Weidong Li, Wenda Wang, Jirong Ran, Huiyuan Li, Jianxun Liu
Summary: This paper focuses on the issues in flow assurance of crude oil pipeline transportation, particularly on pig stalling and wax blockage. By extensively surveying multiple field pigging operations, it summarizes the experience and lessons obtained from these incidents. The drawn experience and lessons are helpful for scheduling pigging program and enhancing the security of pipelines.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Hanqing Zhang, Huiyuan Li, Weidong Li, Jianguang Wang, Wenda Wang, Yongjuan Zhang, Lin Teng, Pengbo Yin, Xin Huang
Summary: Mechanical pigging is a common wax removal technique in crude oil pipeline transportation. A superparamagnetic nanoparticle pigging system has been designed to soften wax deposits and reduce resistance, improving pigging efficiency.
Article
Energy & Fuels
Kaifeng Fan, Si Li, Weidong Li
Summary: This study quantitatively analyzed the radial properties of wax deposits in crude oil pipelines. It was found that the quantity and size of wax crystals in the deposits increased radially, while the aspect ratio and boundary fractal dimension varied little. Additionally, the yield stress of the wax deposits increased with higher wax content and longer deposition duration, with the bottom deposit showing a stronger structure and higher yield stress compared to the surface deposit.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Kaifeng Fan, Si Li, Weidong Li
Summary: The experiments were conducted to investigate wax deposition characteristics and carbon number distributions of wax deposits in waxy crude oil under cold and hot flow conditions. The results showed that the wax content and appearance temperature of surface deposits were lower than those of bottom deposits. The carbon number distributions of wax molecules varied at different positions. This study provides valuable insights into the radial distribution and mechanism of wax deposits, and serves as a useful reference for pigging plan formulation.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Agronomy
Weida Zhang, Yue Wang, Huijing Guo, Wanting Yang, Minrui Guo, Guogang Chen
Summary: This study demonstrates the importance of the epicuticular wax layer in preserving the postharvest quality of Hami melon fruit. Removal of the wax layer leads to fruit softening, water loss, decay, reduced sensory and nutritional quality, and shortened shelf life. The study also highlights the impact of wax removal on antioxidant enzyme activity, non-enzymatic antioxidant content, reactive oxygen species accumulation, lipid peroxidation, and organelle membrane structure.
POSTHARVEST BIOLOGY AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hidetaka Takaki, Shuhei Inoue, Yukihiko Matsumura
Summary: Nickel oxide is reported to change color when exposed to ozone. Through ozone and heat treatments, researchers were able to study the colored and bleached states of nickel oxide films. X-ray photoelectron spectroscopy analysis showed that the NiOOH or Ni2O3 state predominated in the colored sample, with this state decreasing as the heating temperature increased. Additionally, ozone irradiation caused a compressive strain of more than 0.01%, and two types of reactions, fast and slow, were observed during the bleaching process.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Engineering, Chemical
Jia 'nan Wang, Wei Liu, Fubing Zhang, Wenjun Huang, Haomiao Xu, Yuchen Ding, Zan Qu, Naiqiang Yan
Summary: Agglomeration pretreatment is the most effective method to remove fine particulate matters (PM2.5). However, existing technologies were not suitable for high-humidity conditions. This study proposed a method combining spraying and turbulence effects to enhance the agglomeration of fine particles. The results showed that the number concentration proportions of fine particles can decrease and increase within specific size ranges with the spray volume of 15 L/min. Turbulence effects can increase the collision and agglomeration opportunities among particles and droplets, resulting in an increased average particle size. The integration of this method with an agglomeration system can improve the removal efficiency of fine particles in WESP. This study contributes to understanding the mechanism of turbulence on particle agglomeration and provides insights for upgrading existing dust removal equipment.
Article
Environmental Sciences
Weronika Polinska, Alicja Piotrowska-Niczyporuk, Joanna Karpinska, Joanna Struk-Sokolowska, Urszula Kotowska
Summary: In this study, the use of floating plant Wolffia arrhiza for phytoremediation of benzotriazoles was proposed. The optimal conditions for efficient removal were determined using design of experiment methods. The results showed that the plant uptake was mainly responsible for the decrease in benzotriazoles concentration. Furthermore, the tested compounds induced oxidative stress in W. arrhiza.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Seren Acarer
Summary: Wastewater treatment plants are responsible for releasing millions of microplastics into the environment every day, as they cannot completely remove them. Understanding the sources, properties, removal efficiencies, and mechanisms of microplastics in these plants is crucial for their management. This paper discusses the sources and quantities of microplastics in influents, effluents, and sludges of wastewater treatment plants, as well as the efficiency and mechanisms of their removal in different treatment units. It also identifies research gaps and provides suggestions for future research in this field.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Hyundo Park, Jesung Lee, Jonghun Lim, Hyungtae Cho, Junghwan Kim
Summary: The deposition of ash during combustion reduces boiler efficiency. Current methods of ash deposit removal using high-pressure steam often result in steam energy waste and equipment damage. This study proposes a novel method using computational fluid dynamics and a thermal transfer efficiency model to determine the optimal operating conditions of a sootblower. The method considers the characteristics of the ash deposits and aims to improve the efficiency of ash deposit removal and steam usage.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Environmental Sciences
Mengyuan Zou, Weijun Tian, Meile Chu, Zhiyang Lu, Bingkun Liu, Dongpo Xu
Summary: This study prepared a magnetically modified biochar (LC-MBC) immobilized laccase product named LC-MBC through response surface methodology (RSM), and LC-MBC showed excellent removal capacity for NOR, ENR, and MFX. LC-MBC demonstrated superior stability and potential for sustainable application. The synergistic effect of adsorption by MBC and degradation by laccase dominated the removal process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Mengmeng Li, Yuan Luo, Di Zhao, Shangkai Qiu, Lisheng Zhang, Keqiang Zhang, Chun Song, Feng Wang
Summary: This study investigated the effects of different La/Fe oxide composites on phosphate adsorption. The results showed that temperature, specific surface area, and crystal type were the main factors affecting adsorption capacity, while pH and the addition of CO3(2-) had a negative impact on adsorption capacity. The adsorption mechanism involved surface precipitation, electrostatic attraction, and complexation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Xin Li, Xiangzhen Li, Chaonan Li, Na Li, Ping Zou, Xiaolong Gao, Qin Cao
Summary: This study compared denitrification using different VFAs as carbon sources and found that propionate and butyrate systems had higher maximum nitrate removal rates when facing high nitrate volumetric loading rates. Microbial community analysis showed that the enrichment of denitrification bacteria in propionate and butyrate systems was faster, which helped enhance the denitrification performance. The enrichment of functional bacteria in the acetate system took longer.
CHEMICAL ENGINEERING JOURNAL
(2023)
