Article
Environmental Sciences
Nazila Rezania, Maryam Hasani Zonoozi, Motahareh Saadatpour
Summary: The study found that graphene oxide is effective in removing turbidity from water, especially when pH is reduced and GO dosage is increased appropriately. The research also revealed the importance of pH and GO dosage on the performance of the purification process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Hichem Tahraoui, Abd-Elmouneim Belhadj, Zakaria Triki, Nihel Rayen Boudellal, Sarah Seder, Abdeltif Amrane, Jie Zhang, Nassim Moula, Amina Tifoura, Radhia Ferhat, Abla Bousselma, Nadia Mihoubi
Summary: In this study, wastewater from the Antibiotical-Saidal pharmaceutical plant was pretreated by coagulation-flocculation using copper sulfate (CuSO4), iron chloride (FeCl3), and a mixture of the two salts. Response surface methodology (RSM) and Gaussian process regression coupled with the dragonfly optimization algorithm (GPR-DA) were employed to optimize the treatment process and predict the reduction rates of dissolved organic carbon (DOC), absorbance at 254 nm (UV 254), and turbidity. The results showed that the mixed coagulant (CuSO4 + FeCl3) achieved superior treatment efficiency compared to using CuSO4 or FeCl3 alone.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Ifeoma Maryjane Iloamaeke, Nnaemeka J. Nnaji, Edith Chinyere Okpala, Augustine N. Eboatu, Theresa Uzoma Onuegbu
Summary: The study demonstrated that coagulants derived from Mercenaria mercenaria were effective in purifying paint effluent, with significant removal of color within 20 minutes. Modified coagulants showed improved performance, and a second order kinetic model was found to better fit the data for the coagulation-flocculation process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Muhammad Ali Inam, Rizwan Khan, Ick Tae Yeom, Abdul Salam Buller, Muhammad Akram, Muhammad Waleed Inam
Summary: The study utilized Box-Behnken statistical experiment design and response surface methodology to determine the optimal operating conditions for efficient removal of antimony (Sb) species from water using ferric chloride. The results showed that high doses of ferric chloride were effective in achieving maximum removal of both Sb (III) and Sb (V) under optimum pH conditions.
Article
Environmental Sciences
Dawei Yu, Liu Dian, Yonglong Hai, Mark T. Randall, Li Liu, Jibao Liu, Junya Zhang, Xiang Zheng, Yuansong Wei
Summary: This study investigates the effects of temporal evolution of rainfall on urban sewer systems. By analyzing rainfall characteristics in different temporal scales, overflow-risk identification and assessment are achieved. The results show that rainfall, urbanization, and sediments are the major driving forces for long-term CSO pollutants.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
S. Harif, M. A. Aboulhassan, L. Bammou, Zakarya Baicha, Francisco Jose Hernandez Fernandez
Summary: Response surface methodology (RSM) and Box-Behnken design (BBD) were used to optimize the coagulation-flocculation process (CF) of cardboard industry effluent using polyaluminum chloride (PAC) and cationic polyacrylamides (c-PAM). The aim was to determine the optimal combination of coagulant dose, pH, and flocculant dosage for the highest removal efficacy of chemical oxygen demand (COD) and anionic surfactant removal. The results showed that COD reduction was primarily controlled by PAC and c-PAM, while anionic surfactant removal was influenced by pH and PAC. Additionally, the COD and anionic surfactant removal models fitted well with the experimental results (R-2 > 0.85). Coagulation/flocculation using the optimal conditions of pH, PAC, and c-PAM resulted in complete removal of anionic surfactant and more than 95% reduction in COD.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Environmental Studies
Ryohei Ogawa, Ye Zhang, Vouchlay Theng, Zhongyu Guo, Manna Wang, Chihiro Yoshimura
Summary: Among various countermeasures against combined sewer overflow (CSO), urban green space (UGS) has been proven to be effective. However, the effects of UGS on CSO at the municipal scale have not been extensively studied. Therefore, this study aimed to develop a novel method for estimating the relationship between UGS and CSO using a case study in the Tokyo metropolitan area. The results showed that the amount of CSO increases exponentially with rainfall intensity, and increasing the proportion of UGS can mitigate CSO in all sewersheds, especially when the UGS proportion is increased from 5% to 10%.
Article
Engineering, Environmental
Hessam Shabanizadeh, Mohsen Taghavijeloudar
Summary: In this study, pomegranate seed powder was used as a natural alternative to chemical flocculants and coagulants in the flocculation-coagulation process for industrial wastewater treatment. The performance of pomegranate seeds in treating paper recycling wastewater was optimized using response surface methodology. The findings revealed that pomegranate seeds have the potential to be a promising and effective coagulant-flocculant agent for industrial wastewater treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Samaneh Yaghoobian, Maryam Hasani Zonoozi, Mohsen Saeedi
Summary: This research investigated the feasibility of using drinking water treatment sludge as a coagulant for turbidity removal from iron ore tailings slurry. The study demonstrated the remarkable performance of the sludge as a coagulant and identified the predominant removal mechanism.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Tom Wambecq, Stefan Kroll, Johan Van Assel, Rosalia Delgado
Summary: Combined sewage overflows (CSOs) are a common consequence of heavy rainfall events and have significant implications for water quality. With climate change, these events are becoming more frequent and intense, placing greater pressure on aquatic ecosystems. To prevent water pollution, the integration of a dynamic model with rapid calibration of the event mean concentration (EMC) is essential.
Article
Biochemistry & Molecular Biology
Saba Amiri, Vahid Vatanpour, Tao He
Summary: This study explored the coagulation-flocculation process using ferric chloride coagulant and polyacrylamide k16 co-coagulant for As(V) removal. The effects of various operating variables on removal efficiency were investigated. The results showed that coagulant dosing, co-coagulant dosing, pH, and fast mixing speed had the most significant impact on As(V) removal efficiency.
Article
Engineering, Chemical
Roukaya Bouyakhsass, Salah Souabi, Safaa Khattabi Rifi, Soukaina Bouaouda, Abdeslam Taleb, Abdelaziz Madinzi, Tonni Agustiono Kurniawan, Abdelkader Anouzla
Summary: This study focuses on the treatment of landfill leachate using coagulation-flocculation and optimizing the process using central composite design and response surface methodology. The optimal conditions achieved high removal efficiencies for color, polyphenols, and nitrates. The findings offer an efficient and reliable approach to address the challenges of landfill leachate treatment and have important implications for liquid waste management.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Green & Sustainable Science & Technology
Jun Wu, Huaizheng Li, Jin Zhang, Yang Gu, Xinyu Zhou, Dong Zhang, Yan Ma, Shijing Wang, Xingyu Nian, Wei Jin, Ruifei Li, Zuxin Xu
Summary: Understanding the environmental behavior of PAHs in CSOs is crucial for managing PAH pollution in urban areas. This study analyzed the sources and effects of 16 PAHs in CSOs, finding that tetracyclic PAHs had the highest proportion and exhibited a first flush effect. Vehicular emissions were identified as the main source of particulate PAHs in CSOs, impacting river sediment PAH levels and specific microbial populations.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Civil
Zeda Yin, Yasaman Saadati, M. Hadi Amini, Linlong Bian, Beichao Hu
Summary: Combined sewer overflows pose significant threats to public health and the environment, and various strategies have been proposed to mitigate their adverse effects. Smart control strategies have gained traction due to their cost-effectiveness but face challenges in balancing precision and computational efficiency. To address this, we propose exploring machine learning models and the inversion of neural networks for more efficient CSO prediction and optimization.
JOURNAL OF HYDROLOGY
(2024)
Article
Environmental Sciences
Yaxin Chen, Xuan Shi, Xin Jin, Pengkang Jin
Summary: The characteristics and regulation mechanism of overflow pollution caused by sewer sediments under different precipitation intensities were investigated. The results showed that sewer sediments were the main source of overflow pollutants, contributing up to 70%. A prediction formula for the regulation and storage time of overflow pollutants was obtained based on the relationship among rainfall intensity, sediment scouring thickness, and regulation and storage time.
