Article
Engineering, Chemical
Subhadeep Chakraborty, Sonai Dutta, Rahul Chatterjee, Jagannath Chanda, Sagar Pal, Abhijit Bandyopadhyay
Summary: A decorated semi-synthetic flocculant derived from Xanthan gum has been synthesized and found to efficiently unsettle stable kaolin suspension at low concentration (0.25wt.%). The copolymer with the maximum extent of branching (70.5%) exhibited the fastest settling time and the lowest turbidity, especially at pH 7 and the isoelectric point.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Physical
Binqiang Xie, Jiang Ma, Yun Wang, Alain P. Tchameni, Mingwang Luo, Jiantai Wen
Summary: A novel cross-linked modified polyacrylamide gel (HMP-Gel) was designed and developed for lost circulation treatment in high-temperature wells, showing good plugging efficiency and controllable gelation time.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Environmental Sciences
Yuning Chen, Xuhao Li, Wang Zizeng, Li Feng, Jiehong Xie, Zeluan Lin, Zhihong Xu, Bingzhi Liu, Xiang Li, Huaili Zheng
Summary: The research successfully synthesized a new type of template copolymer with a distinct cationic microblock structure, which can effectively improve the flocculation structure and enhance treatment efficiency, leading to an improved sludge dewatering performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Materials Science, Paper & Wood
Zhen Li, Wenli Gong, Xuan Chen, Lin Liu, Ranju Meng, Yanhong Ding, Juming Yao
Summary: In this study, sustainable cationic cellulose bioflocculants with different amino group contents were successfully prepared and proven to be effective in treating high turbidity wastewater. The results demonstrated that the high surface positive charges and supramolecular structure played a crucial role in the flocculation efficiency of cellulose bioflocculants.
Article
Engineering, Environmental
Xin Feng, Junjie Wan, Jinchuan Deng, Xiu Yue, Yulong Yang, Zhanlong He, Xiaohui Fang, Tulan Chen, Shumin Li, Jiankai Lu, Yaoguo Long
Summary: This study used the UV-light-initiated aqueous micellar polymerization method to obtain hydrophobic associating cationic polyacrylamide (HACPAM) as a flocculant and coupled it with quartz sand and fly ash to investigate sludge flocculation and dewatering. The results showed that the larger the molecular weight of HACPAM, the better the dehydration performance. When HACPAM was coupled with quartz sand and fly ash flocculated sludge, the low-dose HACPAM 3 coupled with fly ash showed better dehydration effects.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Nur Syahirah Mohamed Hatta, Shiew Wei Lau, Masahiro Takeo, Han Bing Chua, Priyanka Baranwal, Nabisab Mujawar Mubarak, Mohammad Khalid
Summary: BF01314, a novel soluble chitosan-like bioflocculant derived from Citrobacter youngae GTC 01314, exhibited strong flocculation activities in kaolin suspension and activated sludge, with a broad operating window and significant dewaterability improvement. The flocculation mechanisms were found to be governed by electrostatic charge patching and bridging, making BF01314 a potential candidate for suspended solids removal in water and wastewater treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Polymer Science
Hao Yang, Qingmei Zhao, Qiansheng Yue
Summary: SiO2 particles of different sizes were prepared using the sol-gel method, and nano-silica/cationic polyacrylamide (S-CPAM) was prepared with modified silica (C-SiO2) as a hydrophobic component. The addition of C-SiO2 improved the adsorption capacity of S-CPAM, and the best performance was obtained with a particle size of 15 nm and a C-SiO2 content of 0.7-1%. FT-IR, TEM, H-1-NMR, SEM, TG, surface tension meter, and rotational viscometer were used for characterization.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Engineering, Chemical
Haohe Huang, Qifeng Yang, Lanyu Zhang, Chongxing Huang, Yong Liang
Summary: A simple polyacrylamide modification method was used to improve the adsorption capacity and anti-interference of kaolin, enhancing the adsorption performance of sodium alginate/carboxymethyl chitosan composite hydrogel. The modified kaolin showed reduced interference from coexisting ions and pH influence, and maintained a high adsorption capacity even after multiple reuse cycles.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Chemistry, Physical
Zulfauzein Nadra, Yizhou Sang, Peter Englezos
Summary: This study investigated the flocculation performance of two cationic starches with different charge densities with kaolin clay through small angle light scattering experiments. The results showed that shear and starch concentration were important factors affecting the floc size for both starches. Additionally, temperature was found to be significant only for the higher charge density cationic starch S880, while the combination effects of NaCl and starch concentration, as well as temperature and starch, were significant for the floc size of the S880 system. The combination effect of shear rate and NaCl was found to be significant for the floc size induced by the low charge density S858.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Review
Engineering, Chemical
Shifa M. R. Shaikh, Mohammad K. Hassan, Mustafa. S. Nasser, Sami Sayadi, Ahmad I. Ayesh, Vivek Vasagar
Summary: This paper provides an overview of the latest progress in harvesting microalgae suspensions using polyacrylamide flocculants, examining the impact of polyacrylamide characteristics on flocculation efficiencies and evaluating the effects of culture medium properties on polyacrylamide-induced flocculation. Existing pilot-scale and large-scale polyacrylamide-based flocculation studies are explored while identifying research gaps, key challenges, and future prospects for optimizing microalgae flocculation studies.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Environmental Sciences
Chaochen Fu, Zhengan Zhang, Yuying Li, Lin Li, Hongtian Wang, Shaobo Liu, Xia Hua, Bailian Li
Summary: This study investigated the optimal flocculation conditions for a novel cationic polyacrylamide (CPAM). The results showed that higher intrinsic viscosity and cationic degree of CPAM led to better flocculation effect. Quantitative tests were performed to determine the optimal range of influencing factors and a flocculation model was obtained.
Article
Engineering, Environmental
Jiangya Ma, Wei Xia, Rui Zhang, Lei Ding, Yanli Kong, Huiwen Zhang, Kun Fu
Summary: The modified chitosan flocculants (MCS) synthesized in this study exhibited excellent oil removal efficiency in emulsified oily wastewater treatment over a wide pH range. The cationic and hydrophobic structure of MCS, as well as the use of specific monomers, were found to play key roles in enhancing the oil removal performance. The synthesized MCS showed promising potential for efficient treatment of emulsified oily wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Polymer Science
Kevin Perez, Norman Toro, Matias Jeldres, Edelmira Galvez, Pedro Robles, Omar Alvarado, Pedro G. Toledo, Ricardo Jeldres
Summary: This study investigates the shear resistance of kaolin aggregates in water clarification and recovery operations, and presents a standardized method for determining the shear strength of flocculated kaolin aggregates. The resistance of the aggregates is evaluated based on flocculation time, flocculant dosage, and water quality, and is found to be positively correlated with time and flocculant dosage. In seawater, higher flocculant dosage leads to stronger aggregates, while in industrial water with low salt content, the resistance of the aggregates is higher.
Article
Chemistry, Physical
Dana I. M. Al-Risheq, Shifa M. R. Shaikh, Mustafa S. Nasser, Fares Almomani, Ibnelwaleed A. Hussein, Mohammad K. Hassan
Summary: This study examines the influence of a hybrid coagulation/flocculation process on highly stable bentonite suspension. The results show that cationic and anionic polyacrylamide (PAM) exhibit different flocculation behaviors in the presence of a natural deep eutectic solvent (NADES). The molecular weight and charge density of PAM have a significant impact on the flocculation efficiency of bentonite suspension.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Polymer Science
Gustavo P. Zago, Reinaldo Giudici, Joao B. P. Soares
Summary: Despite being widely used, polyacrylamide faces performance challenges in tailings treatment. This study compared the performance of two commercial polyacrylamides with different molecular weights to treat iron ore tailings with two polymers designed for oil sand tailings treatment. The higher molecular weight polyacrylamide performed better, but still fell short of desired solid-liquid separation efficiency. The new polymer flocculants outperformed commercially available polyacrylamides but retained high water content in the sediments. This comparison suggests the potential use of alternative polymers for iron ore tailings treatment.
Article
Biophysics
Mohammad Shahadat, Tjoon Tow Teng, Mohd. Rafatullah, Mohd. Arshad
COLLOIDS AND SURFACES B-BIOINTERFACES
(2015)
Article
Engineering, Chemical
Siee-Kung Khiew, Tjoon-Tow Teng, Yee-Shian Wong, Soon-An Ong, Norli Ismail, A. F. M. Alkarkhi
DESALINATION AND WATER TREATMENT
(2016)
Article
Chemistry, Multidisciplinary
Ling Wei Low, Tjoon Tow Teng, Abbas F. M. Alkarkhi, Norhashimah Morad, Baharin Azahari
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2015)
Article
Engineering, Chemical
Kah Aik Tan, Norhashimah Morad, Tjoon Tow Teng, Ismail Norli
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2015)
Article
Chemistry, Multidisciplinary
Afizah Ayob, Salina Alias, Farrah Aini Dahlan, Ragunathan Santiagoo, Ahmad Zuhairi Abdullah, Tjoon Tow Teng
MACEDONIAN JOURNAL OF CHEMISTRY AND CHEMICAL ENGINEERING
(2015)
Article
Chemistry, Multidisciplinary
Shabnam Khosravihaftkhany, Norhashimah Morad, Ahmad Zuhairi Abdullah, Tjoon Tow Teng, Norli Ismail
Article
Chemistry, Multidisciplinary
Amir Talebi, Tjoon Tow Teng, Abbas F. M. Alkarkhi, Norli Ismail
Article
Environmental Sciences
Claire Xin-Hui Su, Tjoon-Tow Teng, Yee-Shian Wong, Norhashimah Morad, Mohd Rafatullah
Article
Engineering, Chemical
Mohammad Shahadat, Mohd Rafatullah, Tjoon Tow Teng
DESALINATION AND WATER TREATMENT
(2015)
Article
Biotechnology & Applied Microbiology
Yen-Yie Lau, Yee-Shian Wong, Soon-An Ong, Nabilah Aminah Lutpi, Sung-Ting Sam, Tjoon-Tow Teng, Kim-Mun Eng
Summary: This study demonstrates the effective treatment and degradation pathway of environmental emerging pollutants through a combined treatment method of thermolysis and coagulation-flocculation. The research provides new insights and valuable guidance for establishing efficient multiple-step wastewater treatments.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2023)
Review
Engineering, Environmental
Mohammad Shahadat, Tjoon Tow Teng, Mohd. Rafatullah, Z. A. Shaikh, T. R. Sreekrishnan, S. Wazed Ali
CHEMICAL ENGINEERING JOURNAL
(2017)
Review
Engineering, Environmental
Claire Xin-Hui Su, Ling Wei Low, Tjoon Tow Teng, Yee Shian Wong
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2016)
Proceedings Paper
Energy & Fuels
Yee-Shian Wong, Tjoon-Tow Teng, Norhashimah Morad, Mohd Rafatullah, Yee-Shian Wong, Soon-An Ong
ENERGY, ENVIRONMENTAL & SUSTAINABLE ECOSYSTEM DEVELOPMENT
(2016)
Proceedings Paper
Energy & Fuels
Claire Xin-Hui Su, Tjoon-Tow Teng, Norhashimah Morad, Mohd Rafatullah, Yee-Shian Wong
ENERGY, ENVIRONMENTAL & SUSTAINABLE ECOSYSTEM DEVELOPMENT
(2016)
Proceedings Paper
Energy & Fuels
Yen-Yie Lau, Tjoon-Tow Teng, Norhashimah Morad, Mohd Rafatullah, Yee-Shian Wong, Soon-An Ong
ENERGY, ENVIRONMENTAL & SUSTAINABLE ECOSYSTEM DEVELOPMENT
(2016)
Article
Engineering, Chemical
Arvin Sohrabi, Mousa Meratizaman, Shuli Liu
Summary: This paper simulates and discusses possible solutions to improve the economic and technical performances of a battery-less renewable energy-powered BWRO system under real climate conditions. The study finds that the photovoltaic-based system performs better in terms of specific energy consumption and unused energy ratio.
Article
Engineering, Chemical
Chunlan Pan, Xiaoyin Hu, Vishal Goyal, Theyab R. Alsenani, Salem Alkhalaf, Tamim Alkhalifah, Fahad Alturise, Hamad Almujibah, H. Elhosiny Ali
Summary: This paper introduces a novel waste heat recovery method using the hot flue gas from a ship's engine to produce liquefied hydrogen while meeting the ship's air-conditioning requirement. A comprehensive feasibility assessment is conducted and an artificial neural network with a multiobjective grey wolf optimization method is used for optimization. The findings indicate the highest mean sensitivity index of the flash temperature and the best optimization scenario for exergy efficiency, CO2 emission reduction, and liquefied hydrogen cost.
Article
Engineering, Chemical
Daniele Chinello, Jan Post, Louis C. P. M. de Smet
Summary: In this study, PVDF-based anion-exchange membranes were designed to selectively separate nitrate from chloride. Experimental data showed that increasing the concentration of PVDF enhanced nitrate transport but also increased the membrane electrical resistance. The selectivity of nitrate was found to be independent of the membrane thickness and mainly driven by the increased affinity between the anion and the membrane.
Article
Engineering, Chemical
Umar Noor, Muhammad Fayyaz Farid, Ammara Sharif, Amna Saleem, Zubair Nabi, Muhammad Furqan Mughal, Kiran Abbas, Toheed Ahmed
Summary: Global water scarcity is increasing, and water desalination is an important solution. Multifunctional advanced materials, such as membrane materials and solar-driven desalination, play a crucial role in water desalination. Additionally, these materials can be used for water purification, wastewater treatment, and pollutant elimination.
Article
Engineering, Chemical
Emrah Gumus
Summary: With growing global concerns about climate change and environmental impacts, the use of nuclear energy in naval vessels offers a cleaner and more efficient solution to reduce emissions and address water and energy supply challenges. This study explores a novel system that combines a nuclear-driven supercritical carbon dioxide power cycle with reverse osmosis cogeneration to meet the water and electricity demands in maritime operations, enhancing the sustainability, efficiency, and self-sufficiency of naval vessels. The results indicate that the system has the potential to be a viable and effective solution for naval operations.
Article
Engineering, Chemical
Dao Thi Thanh Huyen, Saikat Sinha Ray, Young -Nam Kwon
Summary: This study focuses on the modification of a commercially available polyamide thin-film composite membrane with a zwitterionic material to enhance its fouling resistance. The modified membrane shows improved salt rejection and reduced permeability compared to the pristine membrane. Fouling tests demonstrate that the modified membrane has a lower fouling ratio and higher recovery ratio. The enhanced antifouling characteristics are attributed to the improved hydrophilicity resulting from the zwitterionic brushes and the salting-in effect.
Article
Engineering, Chemical
Niklas Koeller, Lukas Mankertz, Selina Finger, Christian J. Linnartz, Matthias Wessling
Summary: This study presents a methodology to scale up Flow-electrode Capacitive Deionization (FCDI) technology from lab-scale to pilot-scale systems. By increasing membrane area and using a stacking approach, the FCDI modules were successfully scaled up and achieved a salt transfer rate comparable to lab-scale systems. This provides a foundation for future assessments of energy demand and economics.
Article
Engineering, Chemical
Mona Gulied, Sifani Zavahir, Tasneem Elmakki, Hyunwoong Park, Guillermo Hijos Gago, Ho Kyong Shon, Dong Suk Han
Summary: This study introduces a novel hybrid system that combines direct contact membrane distillation (DCMD) and electrically switched ion exchange (ESIX) to facilitate seawater reverse osmosis (SWRO) brine enrichment and selective lithium recovery.
Article
Engineering, Chemical
Zhiqiang Zhang, Ruifeng Deng, Jiao Zhang, Lu She, Guangfeng Wei, Renyong Jia, Pengyu Xiang, Siqing Xia
Summary: A transmembrane electro-chemisorption system with authigenic acid and base was developed for enhancing ammonia recovery from strong ammonia wastewater. The system efficiently transformed ammonium into free ammonia, which was then adsorbed and recovered through transmembrane chemisorption. This system yielded pure (NH4)2SO4 product and produced valuable byproducts of pure hydrogen and oxygen. Higher applied voltage resulted in better ammonia recovery.
Article
Engineering, Chemical
Alena Popova, Sandrine Boivin, Takuji Shintani, Takahiro Fujioka
Summary: This study aimed to produce a high-integrity RO membrane by forming a polyamide skin layer on a TE support layer, in order to enhance the integrity of the membrane and improve the microbiological safety of potable water reuse.
Article
Engineering, Chemical
Sanjana Yagnambhatt, Saber Khanmohammadi, Jonathan Maisonneuve
Summary: This study investigates the concept of using heat to enhance reverse osmosis (RO) desalination. The effect of temperature on water permeate flux, specific energy, permeate quality, and applied operating pressures is evaluated using an analytical model. The results suggest that under specific conditions, the tradeoff between savings in mechanical pump work and thermal energy input in thermally-enhanced RO can be favorable, leading to overall energy savings.
Article
Engineering, Chemical
Jiangju Si, Chenrui Xue, Shun Li, Linchao Yang, Weiwei Li, Jie Yang, Jihong Lan, Ningbo Sun
Summary: To meet the huge demand for lithium resources, there is an urgent need to develop a new efficient technology for lithium recovery from salt-lake brines. In this study, a selective membrane capacitive deionization system is reported, which achieves high lithium recovery capacity and rate through the use of materials with efficient intercalated pseudo-capacitance and a high specific area porous carbon. The use of a modified thin-coated membrane allows for selective Li+ recovery, and adjusting the concentrations of Li+ and Mg2+ in the feed solution enables higher Li+/Mg2+ selectivity.
Article
Engineering, Chemical
Mohamed R. Salem, R. Y. Sakr, Ghazy M. R. Assassa, Omar A. Aly
Summary: This research proposes a new method of using wasted thermal energies as an additional heating source for solar still distillation units (SSDUs) to increase productivity and reduce pollution and global warming. By testing two SSDUs, the study shows that heating airflow can raise temperatures, enhance freshwater production, and improve system thermal efficiency.
Article
Engineering, Chemical
Qimeng Sun, Miao Sun, Linyan Yang, Yuan Gao, Xinghai Zhou, Lihua Lyu, Chunyan Wei
Summary: This study presents an innovative design and fabrication of a fabric-based conical roll (FCR) evaporator, which enables low-temperature evaporation and achieves high evaporation efficiency with excellent thermal management ability. The evaporator has demonstrated advanced light-harvesting capability and can produce freshwater that meets drinking water standards, showing great potential for applications in desalination and sewage treatment.
Article
Engineering, Chemical
Yidong Zhang, Wangfang Deng, Meiyan Wu, Chao Liu, Guang Yu, Qiu Cui, Pedram Fatehi, Chunlin Xu, Bin Li
Summary: In this study, a novel polydopamine-functionalized lignin-containing pulp foam evaporator with high-efficiency desalination and multi-contaminant adsorption capabilities was designed. The foam evaporator showed excellent light absorption, water absorption, thermal conductivity, and chelation abilities, allowing for solar evaporation and contaminant adsorption synergistically. It also exhibited potential applications in metal ion concentration and contaminated seawater treatments, and demonstrated superior biodegradability compared to poly-styrene foam. This foam material holds promise for developing multifunctional photo-thermal systems for solar-driven water purification.