Article
Chemistry, Multidisciplinary
Wei Zhang, Mengdi Zhang, Jiming Yao, Jiajie Long
Summary: Direct current (DC) electrocoagulation is effective in decolorizing indigo dyeing wastewater but has low chemical oxygen demand (COD) removal rate and high energy consumption due to electrode corrosion. To improve COD removal rate and reduce energy consumption, a peroxi-alternating current (AC) electrocoagulation (EC) system was developed. The study focused on the effects of power type, electrode combination, and process parameters on COD removal rate and decolorization rate, and investigated the COD degradation mechanism. Results showed that AC electrocoagulation enhanced floc adsorption capacity and achieved a COD removal rate of 51.19%. The coupled peroxi-AC electrocoagulation system further removed sulfite and residual dyes, reaching COD removal and decolorization rates of 78.09% and 98.47%, respectively. The system also had significantly lower energy consumption compared to DC electrocoagulation, with a reduction of 70%. Overall, the peroxi-AC EC system is an effective method for reducing COD concentration in indigo dyeing wastewater.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Engineering, Chemical
Perumal Asaithambi, Mamuye Busier Yesuf, Rajendran Govindarajan, Selvakumar Periyasamy, Subramaniapillai Niju, T. Pandiyarajan, Abudukeremu Kadier, D. Duc Nguyen, Esayas Alemayehu
Summary: In this study, various electrochemical and advanced oxidation processes (AOPs) were compared for their ability to remove color and COD from distillery industrial wastewater (DIW) and their impact on power consumption. The hybrid US + ACEF process was found to achieve complete color and COD removal with lower power consumption compared to other processes. The effects of different operational parameters on COD removal efficiency and power consumption were also investigated. The US + ACEF method is the most suitable for efficiently removing pollutants from wastewater and industrial effluent.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Energy & Fuels
Sandeep Kumar Patel, Satish Chandra Shukla, Abhinesh Kumar Prajapati
Summary: Electrocoagulation is an effective method to treat debrominated wastewater, achieving maximum removal rates of 45.5% for COD, 26% for TDS, 86.5% for color, and 100% for turbidity under optimal conditions.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Environmental Sciences
Qiang Leng, Shiming Xu, Xi Wu, Sixue Wang, Dongxu Jin, Ping Wang, Debing Wu, Fujiang Dong
Summary: This study investigated the application of a reverse electrodialysis reactor (REDR) in treating synthetic methyl orange (MO) dyeing wastewater. The effects of operation parameters on the chemical oxygen demand (COD) removal efficiency were explored and a mathematical model was developed to predict the variation of COD removal efficiency with treating time under different conditions. The results showed that increasing the fluid velocity and rinse solution flowrate improved the COD removal efficiency and reduced the total energy consumption of the REDR.
ENVIRONMENTAL RESEARCH
(2022)
Review
Environmental Sciences
Benjamin O. Orimolade, Adewale O. Oladipo, Azeez O. Idris, Feleni Usisipho, Shohreh Azizi, Malik Maaza, Sogolo L. Lebelo, Bhekie B. Mamba
Summary: In recent years, there has been a focus on making water safer and cleaner by eliminating pharmaceutical residues, particularly fluoroquinolone antibiotics, from wastewater. Electrochemical technologies, such as photoelectrocatalysis, electro-Fenton, electrocoagulation, and electrochemical oxidation, have been found to be effective in removing these pharmaceuticals from wastewater. This review discusses the recent progress in the application of these electrochemical processes for the degradation of fluoroquinolone antibiotics, highlighting their fundamentals, results, advantages, limitations, and recommendations for future improvements. It serves as a valuable resource for researchers in the selection of suitable electrochemical techniques for pharmaceutical removal from wastewater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Abdulla Y. Ghjair, Ali H. Abbar
Summary: This study investigates the feasibility of using electro-Fenton (EF) and sono-electro-Fenton (SEF) processes for removing COD from hospital wastewater. The optimal conditions for EF were found to be a current density of 19.293 mA/cm2, an H2O2/COD ratio of 1.4, and a time duration of 46.67 min, resulting in 96.27% COD removal. For SEF, the best conditions were a current density of 10 mA/cm2, an H2O2/COD ratio of 0.2, and a time duration of 46.67 min, leading to 88.31% COD removal.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Quanyuan Chen, Yuan Yao, Zheying Zhao, Juan Zhou, Zhao Chen
Summary: This study investigated the efficacy of pyrite catalyzed Fenton-like oxidation for tertiary treatment of dyeing wastewater and emphasized the importance of its long-term catalytic activity. The results showed that pyrite can effectively catalyze the oxidation of recalcitrant pollutants in suitable conditions, with its heterogeneous catalysis by Fe(II) on the surface being more significant than Homogeneous catalysis by dissolved iron ions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Qingjuan Peng, Xiaoliu Lu, Jinhua Ou, Yihui Zhou, Tao Xu, Bonian Hu, Gang Yu, Chunyou Zhu, Zhihui Xie
Summary: In this study, the new technology of SACFOC was used to treat domestic wastewater containing phosphorus and COD. The results showed that under the optimum conditions, high removal efficiency could be achieved with low energy consumption. SACFOC effectively removed both total phosphorus and COD through electrocoagulation and oxidation. The findings of this research will provide technical guidance and a theoretical basis for wastewater treatment.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Electrochemistry
Babatope O. Ojo, Omotayo A. Arotiba, Nonhlangabezo Mabuba
Summary: This study reports the sonoelectro-Fenton oxidation (SEF) of aspirin in wastewater using a Ti/BZT anode and carbon felt cathode. The synthesized BZT, a piezo-polarization material, was immobilized on a titanium sheet to obtain the Ti/BZT anode. The simultaneous oxidative actions at both the anode and cathode surfaces, as well as the presence of ultrasound irradiation, significantly enhanced the degradation efficiency of aspirin.
ELECTROCHIMICA ACTA
(2023)
Article
Environmental Sciences
Poornima Menon, T. S. Anantha Singh, Nibedita Pani, P. Nidheesh
Summary: The study focuses on utilizing combined Electro-Fenton and sonication for treating wastewater from dye intermediate manufacturing. Under optimal conditions, the removal efficiency for ammoniacal nitrogen and COD were 59.4% and 79.2% respectively, which was enhanced to 65.5% and 85.4% after sonication was applied. Combining EF process with sonication provides a feasible and scientific approach to achieve efficient removal of ammoniacal nitrogen and COD.
Article
Environmental Sciences
Xu Liu, Hui-Lai Liu, Kang-Ping Cui, Zheng-Liang Dai, Bei Wang, Xing Chen
Summary: In this study, heterogeneous photo-Fenton catalysts were prepared using sludge generated in dyeing wastewater through a simple pyrolysis method. FeCN-300 showed the highest degradation efficiency and stability, indicating its great potential for practical applications.
Article
Chemistry, Multidisciplinary
Vishal Kumar Sandhwar, Diksha Saxena, Shilpi Verma, Krishan Kishor Garg, Basheshwar Prasad
Summary: This study compares the performance of EF and EO methods in removing COD from synthetic petrochemical wastewater, finding that EF achieved a COD removal rate of 66.23% while EO achieved a rate of 56.57% under optimal conditions.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Zeynep Bilici, Mohammed Saleh, Erdal Yabalak, Alireza Khataee, Nadir Dizge
Summary: The study investigated the effect of different types of advanced oxidation processes (AOPs) on the treatment of viscose fibers dyeing wastewater, with Fenton supported subcritical water oxidation (FSWO) showing the highest color removal efficiency.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Jun Lu, Quanyuan Chen, Qi Zhao, Xiaochen Liu, Juan Zhou
Summary: The study demonstrated that natural ferrous minerals can effectively act as catalysts in photo-Fenton oxidation for treating recalcitrant organic pollutants in wastewater. Under different conditions of iron mineral catalysts and initial pH, the photo-Fenton oxidation process showed high efficiency in COD removal of pollutants.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Nestor A. Urbina-Suarez, Christian Rivera-Caicedo, Angel Dario Gonzalez-Delgado, Andres F. Barajas-Solano, Fiderman Machuca-Martinez
Summary: The research focuses on the use of advanced oxidation process (AOPs) with hydrogen peroxide (H2O2) and sodium bicarbonate (NaHCO3) for the treatment of tannery wastewater. The optimal process conditions for removing different compounds were found to be NaHCO3 1 M, H2O2 2 M, and 60 degrees C, with high removal efficiencies for color and ammoniacal nitrogen. This study concludes that AOPs using H2O2 and NaHCO3 are recommended for effective removal of color and ammoniacal nitrogen in tannery wastewater.
Article
Engineering, Chemical
Anuj Kumar, Pranay Mohadikar, Fiona Mary Anthony, Diwakar Z. Shende, Kailas L. Wasewar, Asawari Ninawe, Danish Beg
Summary: Glutaric acid is an important chemical compound that can be used for the manufacturing of various chemical products. Research shows that reactive separation is a simple, cost-effective, and environmentally friendly process for the recovery of glutaric acid.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2022)
Article
Engineering, Chemical
Shitanshu Pandey, Kailas S. Wasewar, Dipaloy Datta, Sushil Kumar
Summary: This study investigates the experimental and theoretical perspectives of reactive extraction of gallic acid (GA) from aqueous solutions using tri-n-butyl phosphate (TBP) and tri-n-octylamine (TOA) as extractants dissolved in nontoxic natural oils, namely, rice bran oil, sunflower oil, and soybean oil. The extractability of the solvents is observed to be in the order of sunflower oil > rice bran oil > soybean oil and rice bran oil > sunflower oil > soybean oil with TOA and TBP, respectively. The theoretical insights of the reaction mechanisms for the extraction of GA are estimated through overall equilibrium constants (K-E), stoichiometric coefficients (m), individual equilibrium constants (K-11, K-12, K-21), and concentrations (C-11, C-12, and C-21) of various complexes formed between the extractant and the acid.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Environmental Sciences
Anuj Kumar, Anjali Ingle, Diwakar Z. Shende, Kailas L. Wasewar
Summary: This study investigates the separation of levulinic acid using reactive extraction, validating its feasibility through experimental results and modeling. The use of a mixer settler reactor scheme for separation design parameters is also discussed. The findings of this study are helpful in recovering valuable chemicals in industrial processes and reducing environmental impacts.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Biotechnology & Applied Microbiology
Kalyani A. Motghare, Diwakar Z. Shende, Kailas L. Wasewar
Summary: This study investigates the extraction of butanol from aqueous media using ionic liquids and other solvents, finding variations in extraction efficiency and distribution coefficients among different solvents, which could be beneficial for improving butanol extraction efficiency.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2022)
Review
Environmental Sciences
Dhruti Sundar Pattanayak, Dharm Pal, Jyoti Mishra, Chandrakant Thakur, Kailas L. Wasewar
Summary: Tetracyclines (TCs) antibiotics are widely used in human and veterinary medicines, but their active residues released into the environment pose risks to ecosystems and human health. Photodegradation using graphitic carbon nitride (g-C3N4) as a photocatalyst provides a promising solution for complete antibiotic degradation. Doping g-C3N4 with elements improves its activity, broadens its light-responsive range, and reduces electron-hole recombination. This review discusses the design and efficiency of doped g-C3N4 for TCs degradation in aquatic environments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Anjali A. Ingle, Diwakar Z. Shende, Kailas L. Wasewar, Aniruddha B. Pandit
Summary: This study aims to develop an efficient nanohybrid material as a catalyst support for the production of hydrogen peroxide. The nanohybrid Zr-Al-La supported Pd catalyst was successfully prepared using co-precipitation and wet impregnation methods. The developed catalyst exhibited significant improvements in catalytic activity and mass transfer resistance compared to the traditional Pd catalyst with Al2O3 support.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2022)
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)
Article
Environmental Sciences
Anjali A. Ingle, Shahid Z. Ansari, Diwakar Z. Shende, Kailas L. Wasewar, Aniruddha B. Pandit
Summary: This paper reviews the improvement and application of catalytic hydrogenation in the production of hydrogen peroxide. The study found that supported metal catalysts exhibited better catalytic performance in terms of activity and selectivity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Biotechnology & Applied Microbiology
Anuj Kumar, Diwakar Z. Shende, Kailas L. Wasewar
Summary: This study utilizes a green solvent, sunflower oil, trioctylamine, and tri-n-butyl phosphate to separate levulinic acid, with important parameters obtained from experimental results. A multistage extraction design can achieve a recovery rate of nearly 100% for levulinic acid.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Engineering, Chemical
Fiona Mary Antony, Kailas L. Wasewar
Summary: Due to their superior characteristics, ionic liquids (IL) have been used as a more environmentally friendly alternative for extracting protocatechuic acid (PCA) from industrial waste streams and fermentation. The study found that Imidazolium-based IL, specifically 1-butyl-3-methylimidazolium octyl sulfate and 1-Hexyl-3-methylimidazolium hexafluorophosphate, had an efficiency of 87% in separating PCA from an aqueous stream at 10% IL concentration and 10 mmol L-1 PCA concentration. The research also determined various parameters that are useful for designing an industrial separation unit.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Santosh K. Nath, Anuj Kumar, Fiona M. Antony, Diwakar Z. Shende, Kailas L. Wasewar
Summary: In this study, trioctylamine was used as an extractant to extract aspartic acid from aqueous solutions using different solvents, including 1-octanol, 1-decanol, and cyclohexane. The results showed that the maximum extraction efficiencies were 86.25%, 67.25%, and 58.50% with 1-octanol, 1-decanol, and cyclohexane by trioctylamine, respectively.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Shraddha Wadatkar, Diwakar Z. Shende, Kailas L. Wasewar
Summary: The aim of this study was to use fly ash cenosphere to remove methylene blue from water streams. Nickel oxide, a semiconductor with excellent chemical stability and high catalytic activity, was used as an adsorbent material. Chitosan cenosphere buoyant composite coated with NiO was synthesized using hydrothermal grafting reaction. Batch adsorption experiments were conducted to investigate the adsorptive capabilities of the composite. The results showed that the composite exhibited enhanced degradation of methylene blue.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Fiona Mary Antony, Kailas L. Wasewar
Summary: In the current scenario, the chemical industry is seeking sustainable alternatives for manufacturing chemicals, fuels, and bioplastics due to environmental degradation, global climate change, and the depletion of petroleum feedstock. Biorefining processes that integrate biomass conversion and microbial fermentation are preferred approaches to create value-added compounds. Effective separation and recovery procedures are essential to minimize costs and equipment size, addressing the challenges of dilute concentrations of final products and the demand for high purity goods.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2023)
Article
Engineering, Chemical
Kanti Kumar Athankar, Kailas L. Wasewar
Summary: The separation of carboxylic acids from downstream processes is a major challenge in the chemical industry due to its high cost. In this study, the extraction of acrylic acid from aqueous solution using tri-n-butyl phosphate dissolved in organic diluents was investigated. Benzene showed the highest extraction efficacy and distribution coefficient, reaching 88.60% and 7.772, respectively, at lower acrylic acid concentration and higher tri-n-butyl phosphate concentration. The coextraction of water and the diffusion of acrylic acid were also discussed. The number of theoretical stages and minimum solvent-to-feed ratio were determined for the design of a continuous extraction column.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Shourabh Singh Raghuwanshi, Kailas L. Wasewar, Kanti Kumar Athankar
Summary: This study focused on extracting itaconic acid using reactive tri-n-butyl phosphate dissolved in natural, non-toxic diluents like sunflower oil, rice bran oil, and sesame oil. The results showed that sunflower oil had the highest extraction efficiency and distribution coefficient for itaconic acid.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
