Article
Engineering, Environmental
Yang Deng, Nan Chen, Weiwu Hu, Haishuang Wang, Peijing Kuang, Fangxin Chen, Chuanping Feng
Summary: In this study, a persulfate-enhanced electro-coagulation system (PECS) was constructed to improve the removal of COD and shorten the settling time of the flocculation precipitates. By using activated persulfate oxidation process, PECS can reduce the aromaticity and complexity of organic matter, generating small molecular-weight organic matter to alleviate the pressure of subsequent treatment of the leachate. The results suggest that PECS could improve the removal of organic matter, increase the COD removal, and shorten the separation time of precipitates under similar treatment costs to conventional processes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Pradeep Kumar Singa, Mohamed Hasnain Isa, Baskaran Sivaprakash, Yeek-Chia Ho, Jun-Wei Lim, Natarajan Rajamohan
Summary: Three Fenton processes, including conventional Fenton, photo-Fenton, and electro-Fenton, were used to remove PAHs from landfill leachate. RSM and ANN were used to optimize the treatment conditions. The photo-Fenton and electro-Fenton processes showed higher removal percentages for COD and PAHs compared to the Fenton process. Elemental characterization of the resultant iron sludge revealed the presence of various elements, with oxygen being the most abundant.
ENVIRONMENTAL RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Zhengguang He, Yaqi Liu, Jinlin Wang, Yujing Lv, Yun Xu, Shengyong Jia
Summary: The Fe(3)O(4)NPs@MOF-based heterogeneous electro-Fenton process showed high efficiency in removing organic contaminants in old landfill leachate, with COD removal efficiency reaching 66.67%. The key role of .OH in organic contaminants degradation and the protective function of MOF shell in the process were highlighted.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
M. B. Karagozoglu, F. S. Guney
Summary: This study investigated the removal of organic and inorganic pollutants in landfill leachate using the electro-Fenton process. The results showed that under optimum conditions, the process was able to effectively degrade organic compounds in the leachate, achieving high removal efficiencies.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Shi Shu, Chengjian Peng, Huan Liu, Lifu Meng
Summary: This study evaluated the breakthrough times for bottom barrier systems used in typical active MSW landfills in four Chinese cities using numerical modeling of chemical oxygen demand transport. The results showed that using a leachate head of 0.3 m, the breakthrough times for the barrier systems in all four landfills were greater than 50 years. However, under actual leachate head conditions, the breakthrough time for the barrier system in the Hangzhou landfill was only 27 years. The results of this study provide reference data for designing and managing landfill barrier systems.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Xue Zhang, Huijuan Han, Hongxing Chai, Penghao Gao, Wei Wu, Mengzhao Li, Qingxin Lv, Xianglin Guo, Qingmei Meng, Xinpeng Liu, Peiling Gao
Summary: Wastewater treatment is achieved through the regeneration of resources and energy using pre-treatment technologies. Coagulation pre-treatment of landfill leachate was performed in this study using polymeric iron sulfate (PFS) as a coagulant. The effects of PFS dosing, initial pH, and PAM dosing on the removal of COD, TP, and UV254 from the leachate were evaluated. Response surface methodology (RSM) was used to assess the individual and interactive effects of parameters on COD%, TP%, and UV254%. The optimization results showed significant removal of contaminants in the leachate, with COD%, TP%, and UV254% reaching their maximum values at specific conditions.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Qinghui Yu, Ying Zhang, Mengshuang Tang, Guotao Liu, Lei Li
Summary: A green catalyst Co-SAM-SCS was used with an EF system to treat organic matter and NH3-N in leachate landfill. COD degradation relied on BDD anodic catalysis and Co-SAM-SCS particles, while NH3-N removal depended on ClO- oxidation produced by the cathode. Optimal device and operating conditions were determined, resulting in high removal rates and improved wastewater properties.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Mohini Verma, Shubhrasekhar Chakraborty, Shweta Kumari, Aalok Gupta, Dewanshu Kumar, Jawed Iqbal, J. Rajesh Banu, Arulazhagan Pugazhendi, R. Naresh Kumar
Summary: A laboratory-scale GAC-SBR was used to co-treat landfill leachate and municipal wastewater, and the treatment efficiency was evaluated. Increasing GAC concentration led to better removal of COD and ammonia from leachate. GAC-SBR demonstrated efficient removal of COD and nutrients at a 10-day HRT. Statistically significant differences were observed in the treatments for different leachate:wastewater ratios. Coupled treatment showed potential for co-treatment, but additional physico-chemical processes may be required for further pollutant removal.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Environmental Sciences
Zhihong Ye, Fei Miao, Hui Zhang
Summary: This study demonstrates for the first time the feasibility of removing COD and NH4+-N from landfill leachate using an electrochemical assisted HClO/Fe2+ process. The performance of active chlorine generation at the anode was evaluated, and the coexistence of (OH)-O-center dot and (FeO2+)-O-IV in the system was confirmed. The influence of pH, Fe2+ concentration, and current density on COD and NH4+-N removal was investigated, and the reaction mechanism was proposed. The proposed process shows promise as an alternative for treating refractory landfill leachate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Hamza Bellouk, Mohamed Danouche, Imane El Mrabet, Karim Tanji, Fouad Khalil, Mostafa Nawdali, Naima El Ghachtouli, Hicham Zaitan
Summary: This study investigated the use of an ultrasound-photo-Fenton process (US-P-FP) for landfill leachate treatment. The results showed that the process effectively removed COD, UV254, and color from the leachate. Optimization of operating factors resulted in the highest removal efficiencies at specific conditions, and the treated leachate showed reduced phytotoxicity.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Alana C. Crispim, Danyelle M. de Araujo, Carlos A. Martinez-Huitle, Fernanda L. Souza, Elisama Dos Santos
Summary: This study investigates the applicability of electro-Fenton (EF) and photoelectro-Fenton (PEF) processes for treating landfill effluent with high organic content. The results show that after 4 hours of operation at a current density of 90 mA cm(-2), the best efficiencies for removing organic matter (COD) were 66%, 68%, and 89% for EF, PEF-UVA, and PEF-UVC, respectively, with relatively low energy consumption.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Lakshmi Pisharody, Ashitha Gopinath, Milan Malhotra, P. Nidheesh, M. Suresh Kumar
Summary: Landfilling is a common method for managing municipal solid waste globally, but leachate generation poses environmental issues. Advanced oxidation processes (AOPs) show potential in removing micropollutants from landfill leachate, but further research is needed for better understanding.
Article
Environmental Sciences
Yilin Li, Wenjia Zhang, Yun Dai, Xiaomei Su, Yeyuan Xiao, Dan Wu, Faqian Sun, Rongwu Mei, Jianrong Chen, Hongjun Lin
Summary: This study investigated the start-up, influencing factors, and stable operation of partial denitrification for treating biological effluent from landfill leachate. The research found a suitable ratio of nitrate/ammonium for downstream Anammox process, and highlighted the importance of carbon sources, COD/NO3--N ratio, and salinity in partial denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Emine Can-Guven, Senem Yazici Guvenc, Gamze Varank
Summary: This study investigated a sequential treatment of landfill leachate including coagulation and binary oxidation processes. The research optimized the chemical coagulation process and examined the factors affecting the binary oxidation process to achieve high removal efficiencies. The results showed that the binary processes were more effective than single processes, reaching significant removal efficiencies under optimal conditions.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Anjali Bhagwat, Rajat Kumar, Chandra Shekhar Prasad Ojha, Mukesh Kumar Sharma, Apourv Pant, Babita Sharma, Jai Vir Tyagi
Summary: The leachates from landfills pose a potential contamination risk to surface and groundwater. As the landfill ages, the leachate's pH changes, affecting treatment methods. Ferric chloride is found to be the most efficient coagulant, surpassing Fenton. Switching to ferric chloride or Fenton treatment can significantly reduce operational costs compared to the current method used.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Maria Cristina Collivignarelli, Sara Todeschini, Alessandro Abba, Paola Ricciardi, Marco Carnevale Miino, Vincenzo Torretta, Elena Cristina Rada, Fabio Conti, Giacomo Cillari, Silvia Calatroni, Giuseppe Lumia, Giorgio Bertanza
Summary: The research aims to identify a tool to analyze the performance and environmental context of sewer systems and wastewater treatment plants, providing evaluation and financial planning tools for optimizing system performance.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Navarro Ferronato, Gabriela Edith Guisbert Lizarazu, Marcelo Antonio Gorritty Portillo, Luca Moresco, Fabio Conti, Vincenzo Torretta
Summary: The research highlights the benefits of inert CDW recycling with focus on selective collection rates and transportation distances. It suggests that higher selective collection rates spread the importance of transportation distances planning and outlines the importance of implementing LCA with primary data and involving statistics related to transportation. The outcomes of the research support the implementation of CDW recycling in developing countries as material recovery is always found to be beneficial.
WASTE MANAGEMENT & RESEARCH
(2022)
Article
Environmental Sciences
Navarro Ferronato, Luca Moresco, Gabriela Edith Guisbert Lizarazu, Marcelo Antonio Gorritty Portillo, Fabio Conti, Vincenzo Torretta
Summary: Construction and demolition waste (CDW) and municipal solid waste (MSW) are the most generated waste flows globally, especially in developing countries where they are mostly disposed of in open dumps. This study compares the environmental impacts of the MSW and CDW management system in La Paz, Bolivia, and evaluates the importance of recycling in mitigating these impacts. The results highlight the significance of organized CDW management systems in integrated waste management schemes to prevent environmental degradation in developing cities.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Donato Scrinzi, Daniela Bona, Andrea Denaro, Silvia Silvestri, Gianni Andreottola, Luca Fiori
Summary: This research explores a new industrial model for managing organic solid waste, using anaerobic digestion and subsequent composting, with the addition of hydrothermal carbonization as a post-treatment process. The findings show that the hydrochars and hydrochar co-composts produced are suitable for agro-industrial applications, and the hydrothermal carbonization liquors can be used in biochemical methane potential tests for methane production. These new approaches can enhance plant capacity and increase biogas production. Additionally, the study describes the agro-environmental properties of hydrochars and hydrochar co-composts, highlighting the beneficial effect of composting on reducing phytotoxicity of hydrochars.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Chemical
Roberta Ferrentino, Michela Langone, Davide Mattioli, Luca Fiori, Gianni Andreottola
Summary: This study investigates the use of hydrothermal carbonization (HTC) technology in the co-treatment of sewage sludge digestate (SSD) and organic fraction of municipal solid waste (OW). The results show that adding organic waste to the HTC process increases biogas and biomethane production. Additionally, the AD1-HTC-AD2 process significantly improves sludge dewaterability. Energy assessment estimates that the co-treatment of OW with SSD in HTC can cover 100% of the system's energy consumption.
Article
Engineering, Environmental
Pietro Castellani, Navarro Ferronato, Marco Ragazzi, Vincenzo Torretta
Summary: This research evaluates the municipal solid waste management system and the environmental and economic benefits of onsite treatment plants in the Pelagian archipelago, Italy. The results show that implementing onsite treatment plants can save costs and reduce environmental impacts, making them viable options for solid waste management systems in isolated regions.
WASTE MANAGEMENT & RESEARCH
(2023)
Article
Environmental Sciences
Navarro Ferronato, Rocio Clara Fuentes Sirpa, Edith Gabriela Guisbert Lizarazu, Fabio Conti, Vincenzo Torretta
Summary: In Bolivia, where construction and demolition waste management is lacking, a study in the city of La Paz examined future recycling scenarios by conducting a CDW flow analysis and cost assessment. The estimation showed that La Paz could potentially generate around 271,051-349,418 tonnes of CDW annually, which is double the projected amount by local authorities. The analysis also found that approximately 56.1-71.1% of inert aggregates can be recycled. The best management scenario involves the source separation of recyclable materials and the use of both stationary and mobile recycling facilities.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Navarro Ferronato, Alberto Pietro Damiano Baltrocchi, Francesco Romagnoli, Iris Jabneel Calle Mendoza, Marcelo Antonio Gorritty Portillo, Vincenzo Torretta
Summary: Developing countries face the dual challenges of resource shortage and inadequate waste management systems, which necessitates the introduction of alternative waste valorisation options. This research conducts an environmental Life Cycle Assessment (LCA) of waste-based briquettes made from non-recyclable cardboard waste and sawdust, comparing their environmental impacts with conventional fuels. The findings indicate that the briquettes contribute to several impact indicators, with global warming, non-renewable energy use, and respiratory inorganics being the most significant.
ENERGY FOR SUSTAINABLE DEVELOPMENT
(2023)
Review
Environmental Sciences
Roberta Ferrentino, Michela Langone, Luca Fiori, Gianni Andreottola
Summary: In recent years, there has been increasing attention on sewage sludge management and the associated energy consumption, which are major cost factors in wastewater treatment plants. Therefore, it is important to implement technologies that can reduce sludge production and have a positive impact on the overall energy balance of the sewage treatment plant. This study aimed to evaluate full-scale sludge reduction technologies integrated into both the water and sludge lines of a municipal sewage treatment plant. The results showed that ultrasound in the water line and CAMBI (TM), BioThelys (TM), Exelys (TM), and TurboTec((R)) in the sludge line were the most effective technologies in reducing sludge production, although they did require a significant amount of energy.
Article
Green & Sustainable Science & Technology
Riccardo Boiocchi, Marco Ragazzi, Vincenzo Torretta, Elena Cristina Rada
Summary: The Universitas Indonesia GreenMetric World Ranking is widely used to assess the sustainability of worldwide universities. An in-depth analysis of this ranking system reveals that some indicators are ineffective in measuring sustainability development, while others need adjustment for context-specific factors. By taking these considerations into account, a fairer evaluation and comparison of universities' sustainability can be achieved, providing useful information for improvement.
Review
Biochemistry & Molecular Biology
Marco Orlando, Gianluca Molla, Pietro Castellani, Valentina Pirillo, Vincenzo Torretta, Navarro Ferronato
Summary: The accumulation of synthetic plastic waste in the environment has raised global concerns. Microbial enzymes offer promising biotechnological tools for plastic recycling, but their effectiveness depends on waste management practices. This review highlights the potential of biotechnology in plastic bio-recycling within the European waste management framework. Current biotechnology tools can support polyethylene terephthalate (PET) recycling, but other unrecycled plastics, such as polyurethanes and polyolefins, require further research and optimization of chemoenzymatic technologies. New bio-based technologies with lower environmental impacts should also be developed to efficiently depolymerize both existing and new plastic materials.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
Alberto Pietro Damiano Baltrocchi, Navarro Ferronato, Iris Jabneel Calle Mendoza, Marcelo Antonio Gorritty Portillo, Francesco Romagnoli, Vincenzo Torretta
Summary: This study evaluates the economic and social sustainability of waste-based briquettes in Bolivia. The results show that briquettes have a lower cost compared to coal, but higher than subsidized fossil fuels in Bolivia. Briquettes also have better social impacts in six out of ten assessed subcategories. In conclusion, waste-based briquettes can have economic and social benefits, but require incentives and market analysis for diffusion in Bolivia.
SUSTAINABLE PRODUCTION AND CONSUMPTION
(2023)
Article
Engineering, Environmental
Navarro Ferronato, Adeline Mertenat, Christian Zurbrugg, Vincenzo Torretta
Summary: Open dumping and burning of solid waste are common practices in low-income countries. On small and touristic islands, the problem is exacerbated due to the additional volume of waste amount generated by tourists. This article presents a case study of Nosy Be island in Madagascar to demonstrate how tourism can be used as a catalyst for waste recovery and recycling to address the waste challenge. The study highlights the importance of active participation and involvement of local partners supported by international experts, and proposes potential circular models for waste management in Nosy Be.
WASTE MANAGEMENT & RESEARCH
(2023)
Article
Energy & Fuels
Riccardo Boiocchi, Paolo Viotti, Davide Lancione, Nicoletta Stracqualursi, Vincenzo Torretta, Marco Ragazzi, Gabriela Ionescu, Elena Cristina Rada
Summary: This study analyzes the carbon footprint of a large wastewater treatment plant in central Italy, finding that energy consumption, natural gas production and transport, and nitrous oxide emissions from effluent are the most significant contributors. These findings suggest that managers of wastewater treatment plants should prioritize these aspects when taking action to mitigate carbon footprint.
Article
Materials Science, Multidisciplinary
Athanasia K. K. Tolkou, Elena Cristina Rada, Vincenzo Torretta, Maria Xanthopoulou, George Z. Z. Kyzas, Ioannis A. A. Katsoyiannis
Summary: The occurrence of arsenic in water is a global public health problem, and adsorption onto iron oxy-hydroxides is a commonly used technique for its removal. This study investigated the combined use of graphene oxide (GO) and granular ferric hydroxide (GFH) in different molar ratios for maximum As(III) removal. The presence of GFH enhanced the adsorption capacity of GO, with the optimal molar ratio of GO/GFH 2:1 achieving 90% removal at pH 7.0 +/- 0.1. The Freundlich isotherm and pseudo-second-order kinetic models effectively described the experimental data, with a maximum adsorption capacity of 22.62 μg/g.
C-JOURNAL OF CARBON RESEARCH
(2023)
