Article
Chemistry, Multidisciplinary
Negar Golzadeh, Bahareh Lorestani, Soheil Sobhanardakani, Mehrdad Cheraghi, Nematollah Khorasani
Summary: This research compares the efficiency of chemical coagulant and natural coagulant in removing turbidity from industrial wastewater. The results show that both coagulants have similar turbidity removal effects. Increasing the coagulant concentration results in a higher percentage of turbidity reduction. The coagulant derived from yellow leaves of the Plantain tree is recommended as an effective alternative to chemical coagulant due to its high ability to remove turbidity, abundant resources, low cost, environmental friendliness, and biodegradability.
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Chemistry, Multidisciplinary
Negar Golzadeh, Bahareh Lorestani, Soheil Sobhanardakani, Mehrdad Cheraghi, Nematollah Khorasani
Summary: This study compared the efficiency of chemical and natural coagulants in removing turbidity from industrial wastewater and found that they had similar effectiveness. The coagulant derived from the yellow leaves of the Plantain tree was recommended as an effective alternative to the chemical ferric chloride coagulant due to its high ability to remove turbidity, complete coagulation, abundant resources, low cost, environmental friendliness, and biodegradability.
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Chemistry, Multidisciplinary
Bo Guo, Sen Zhang, Xing Xu, Baoyu Gao, Qian Li, Qinyan Yue
Summary: The deterioration of water caused by industrial production is a significant problem. This study demonstrates the use of ferric chloride and poly-ferric chloride coupled with polyamidine to enhance coagulation and remove toxic organics. The addition of polyamidine significantly improves the coagulation performance of the iron-based coagulants. The results show that charge neutralization and adsorption-bridging are the main processes for the removal of organics, and the purification performance is enhanced by the higher charge density of polyamidine.
CHINESE CHEMICAL LETTERS
(2023)
Article
Environmental Sciences
Tayebeh Goli, Yasha Jathan, Yu Yang, Krishna R. Pagilla, Eric A. Marchand
Summary: Most wastewater treatment facilities remove dissolved inorganic nitrogen (DIN) efficiently, but leave dissolved organic nitrogen (DON) at a higher proportion in the effluent. Discharged DON promotes algae growth and formation of hazardous nitrogenous disinfection byproducts (N-DBPs). This study evaluated the DON removal efficiency of enhanced coagulation at a pilot scale using different coagulants and polymer. Enhanced coagulation effectively reduced DON in the effluent with auxiliary benefits of dissolved organic carbon and orthophosphate removal.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Amina A. Owodunni, Suzylawati Ismail, Setyo Budi Kurniawan, Azmi Ahmad, Muhammad Fauzul Imron, Siti Rozaimah Sheikh Abdullah
Summary: Phosphorus is a major pollutant causing eutrophication, and coagulation-flocculation is a commonly used technology to treat phosphorus-containing wastewater. However, metal-based coagulants have raised environmental concerns due to their toxicity. Natural coagulants offer a comparable performance in removing phosphorus from wastewater and have the advantage of producing sludge that is safer for plants and aquatic organisms. The combination of natural coagulation with other treatment technologies, such as filtration, improves phosphorus removal. However, the challenge lies in the selection and purification of raw materials for natural coagulants.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Yong Cheng, Longjun Xu, Chenglun Liu
Summary: In this study, red mud was used as a raw material to extract aluminum and iron, and a highly efficient polyaluminium ferric chloride (PAFC) flocculant was prepared. The flocculation performance of the PAFC under different synthesis and flocculation conditions was investigated. The results showed that the PAFC prepared at specific conditions had the optimum effect and could be used for the treatment of aged landfill leachate.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Biochemistry & Molecular Biology
Nomthandazo Precious Sibiya, Sudesh Rathilal, Emmanuel Kweinor Tetteh
Summary: This study investigated the use of ferromagnetite, alum, and eggshells as cost-effective coagulants for industrial wastewater treatment. The results showed that at optimal dosage and settling time, ferromagnetite was the most effective in removing contaminants from the wastewater.
Article
Environmental Sciences
Jie Yang, Xiao Ma, Qiao Xiong, Xiangjun Zhou, Hongtao Wu, Suding Yan, Zulin Zhang
Summary: A novel functional biochar (BC) was prepared from industrial waste red mud (RM) and low-cost walnut shell to adsorb phosphorus (P) in wastewater. The preparation conditions for RM-BC were optimized using Response Surface Methodology, and the adsorption characteristics of P and the impact of key minerals in RM on the P removal efficiency of the RM-BC composite were investigated. This research provides evidence for the effectiveness of RM-BC in treating P in water.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
K. L. Muedi, H. G. Brink, V Masindi, J. P. Maree
Summary: This study successfully synthesized Fe/AlO(OH) from acid mine drainage and examined its arsenate removal capabilities. Optimized conditions were found to be 150 ppm of As(V), a solid:liquid ratio of 1 g: 250 mL, a contact time of 60 min, ambient temperature, and pH.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Chemical
Jian-ming Gao, Bo Wang, Wenjie Li, Li Cui, Yanxia Guo, Fangqin Cheng
Summary: The preparation of inorganic polymer coagulants from circulating fluidized bed (CFB) fly ash is an effective and environmentally friendly approach. However, the low solubility of CFB fly ash in acidic systems limits its utilization efficiency. This paper proposes an enhanced metal leaching process using a combined HCl-H2SO4 leaching process for the preparation of polymeric aluminum ferric chloride sulfate (PAFCS). The obtained PAFCS showed excellent coagulation performance in wastewater treatment, demonstrating its potential as an alternative coagulant to traditional ones such as PAC and PAFC.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Congzhong Shi, Qiming Wang, Daiqi Li, Beini Zeng, Qingtao Liu, Yongming Cui, Jinfeng Wang, Xungai Wang
Summary: Wool scouring wastewater contains substantial contaminants that need to be removed. Inorganic composite coagulants (PAFS) were prepared and found to have better performance in treating the wastewater compared to conventional coagulants. PAFS showed higher removal rates for COD and turbidity, along with advantages such as fast settling rate, increased sludge density, and low floc moisture content. This work has practical implications for improving wastewater treatment in the wool scouring industry.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Moatlhodi Wise Letshwenyo, Serwalo Mokgosi
Summary: Water treatment sludge can effectively remove phosphorus and sulphate from wastewater as an adsorbent. However, leachability of manganese is a concern. The adsorbent showed high adsorption performance at pH 8.04, and pseudo second order reaction better fits the adsorption process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Chandler Mancuso, Megan Jamison, Jared Zaporski, Ziming Yang
Summary: This study evaluated five coagulants for reactive phosphate removal from wastewater, finding that alum and ferric chloride showed higher removal efficiency compared to prepolymerized and high-basicity coagulants. The optimal removal pH increases with increasing coagulant basicity.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Environmental Sciences
D. Liu, S. Zhou
Summary: The study showed that phosphorus can be efficiently recovered from glyphosate-rich wastewater through chemical coagulation.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Juan Li, Martha Dagnew, Madhumita B. Ray
Summary: This study investigates the effect of coagulation on microfibers from laundry processes and finds that the addition of polyaluminum chloride (PACl) can increase the removal efficiency. The study also observes surface changes of the microfibers during coagulation and identifies charge neutralization and adsorption-bridging as the dominant mechanisms.
ENVIRONMENTAL RESEARCH
(2022)
Article
Metallurgy & Metallurgical Engineering
Arsyad Maulana Dzulqornain, Ana Belen Cueva-Sola, Kyeong Woo Chung, Jin-Young Lee, Rajesh Kumar Jyothi
Summary: This study presents a hydrometallurgical process for the separation of light rare earth elements (LREEs) using oxidation, precipitation, solvent extraction, and stripping techniques. Selective oxidation with potassium permanganate was employed for the separation of cerium (III). Solvent extraction with Cyanex 572 and cross-current scrubbing were used to achieve the separation of lanthanum (III) from neodymium (III) and praseodymium (III).
Article
Metallurgy & Metallurgical Engineering
Bo Chen, Shenxu Bao, Yimin Zhang
Summary: This study investigated the effects of Al, Fe, P, Si and Na on the precipitation characteristics of vanadium in the ultrasound precipitation system. The concentration upper limits and the negative influence on the precipitation kinetics were determined for each impurity. The findings provide theoretical and technical support for the industrial application of ultrasound precipitation technology.
Article
Metallurgy & Metallurgical Engineering
Chunlin He, Mingwei Qi, Yun Liu, Zunzhang Liu, Yuezhou Wei, Toyohisa Fujita, Guifang Wang, Shaojian Ma, Wenchao Yang, Junyuan Gan
Summary: In this study, D201 x 7 resin and tartaric acid were used as materials and complexing agents for the separation of germanium from sulfuric acid solution. The study successfully achieved the separation of germanium and demonstrated the high selectivity and adsorption performance of the resin.
Article
Metallurgy & Metallurgical Engineering
Xiaobo Zhu, Yue Liu, Chen Ma, Wang Li
Summary: A selective and highly effective method for the extraction and separation of V(IV) and Fe(III) using N235 and P507 as solvent extractants is proposed. The pH, composition, and concentration of the extractant mixture have significant effects on the extraction efficiency and separation factor. The mixing of P507 and N235 generates the P507 monomer, which enhances the extraction efficiency and weakens the stability of vanadium containing extraction complex. Cation exchange process forms the extraction complexes.
Article
Metallurgy & Metallurgical Engineering
B. Behnajady, J. Yousefi Seyf, S. Karimi, M. Moradi, M. Sohrabi
Summary: Deep eutectic solvents (DES) have potential as environmentally-friendly solvents for recovering metals from spent lithium-ion batteries (LIBs). Experimental and molecular dynamics simulation results showed that the chloride ions in DES can form complexes with lithium, manganese, and nickel ions, facilitating their extraction.
Review
Metallurgy & Metallurgical Engineering
Sebastian Kinas, Dorota Jermakowicz-Bartkowiak, Anna Dzimitrowicz, Piotr Cyganowski
Summary: The high demand for platinum-group metals (PGMs) and Re in economical and industrial applications related to environmental protection and energy conversion/storage has led to resource scarcity. Thus, it is crucial to recover and recycle these rare metals. This study critically reviews the recent progress in the effective recovery of PGMs and Re from materials relevant to sustainable technologies, emphasizing practical aspects, environmental impact, and issues related to the unit processes of recovery.
Article
Metallurgy & Metallurgical Engineering
Guopeng Yang, Qinggang Li, Guiqing Zhang, Mingyu Wang, Zuoying Cao, Wenjuan Guan, Jiawei Du, Shengxi Wu
Summary: The study proposes an efficient, clean, and economical process for recovering V2O5 from titanium-white waste through hydrogen peroxide stripping and precipitation of vanadium products by heating. Experimental results show that the use of D2EHPA as a modifier prolongs the duration of maximum stripping efficiency, enabling continuous operation.
Article
Metallurgy & Metallurgical Engineering
Guisu Yu, Shuainan Ni, Yun Gao, Ditang Mo, Zhiyuan Zeng, Xiaoqi Sun
Summary: This research proposes a novel green process for the selective recovery of rare earth elements (RE) from spent NdFeB permanent magnet using hydrophobic deep eutectic solvent (HDES). Through optimization of extraction conditions and stripping method, efficient and clean separation and recovery have been achieved.
Article
Metallurgy & Metallurgical Engineering
Jia Li, Xinsheng Wu, Xiaozhou Zhou, Li Zeng, Shengxi Wu, Mingyu Wang, Wenjuan Guan, Zuoying Cao, Qinggang Li, Guiqing Zhang
Summary: This paper presents a complete hydrometallurgical route for the full-component utilization of deep-sea polymetallic nodules (DPN), achieving high recovery efficiency and near-zero waste production with low energy consumption.
Article
Metallurgy & Metallurgical Engineering
Sanae Elmisaoui, Abderrazak M. Latifi, Lhachmi Khamar
Summary: A first principles model is developed to describe the dissolution mechanism of phosphate ore particles in a solution of phosphoric acid. The model accounts for non-uniform size of ore particles using particle size distributions and quantifies their influence on the model predictions. A global estimability analysis is carried out to determine the estimable parameters from experimental data, and the predictions show good agreement with the experimental data. The computed activation energy indicates that diffusion is the rate limiting step of the dissolution process.
