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
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
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
Yuqi Qi, Jinrong Qiu, Junshi Tao, Jun Zeng, Rentao Liu, Haolang Liu, Minmin Chen, Na Liu, Jingwen Zeng
Summary: This study investigated the changes in biogeochemical parameters at different positions of a landfill leachate pollution plume through microcosm simulation experiments. The results showed that the pollution source of landfill leachate leakage contamination is characterized by high electrical conductivity (EC) and low oxidation-reduction potential (ORP). Biogeochemical parameters within the plume changed significantly, with an anaerobic environment formed and an initial stage of acid production followed by methane production. The bacterial diversity index was lower and the relative abundance of microorganisms capable of anaerobic fermentation, degradation, and heavy metal resistance was higher in areas closer to the pollution source.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Engineering, Chemical
Imane El Mrabet, Mourad Benzina, Hicham Zaitan
Summary: The study found that the combination of Fenton process and adsorption onto natural bentonite clay is effective in treating landfill leachate, with removal rates of 84% for COD and 98% for color, indicating that this combined treatment method is an ideal option.
DESALINATION AND WATER TREATMENT
(2021)
Article
Green & Sustainable Science & Technology
Elena H. del Amo, Rodrigo Poblete, Olga Sanchez, Manuel I. Maldonado
Summary: In this study, an adapted compost was used to treat complex, toxic, and aged landfill leachate. High removal efficiencies of organic matter, copper, and iron were achieved after pretreatments and the biologic process with compost. The analysis of microbial assemblages in compost samples revealed certain resilient genera and relevant metabolisms for pollutant removal.
JOURNAL OF CLEANER PRODUCTION
(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
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
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
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
Engineering, Environmental
Amirhossein Rezaei Adaryani, Olya Keen
Summary: The disposal of pharmaceuticals and plastic waste produces contaminants of emerging concern (CECs) in landfill leachate. This study found that CECs, including pharmaceuticals and plasticizers, can persist in leachate many years after landfill closure. The transport of these compounds with landfill leachate is expected to continue as long as leachate is generated in the landfill.
Article
Environmental Sciences
Mina Ghahrchi, Abbas Rezaee
Summary: The integrated electro-catalytic ozonation process using Fe-EDTA combined with electrocoagulation significantly enhances COD removal efficiency in landfill leachate, ultimately reducing sludge production.
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
Chemistry, Analytical
Tahar Bennama, Abdelkader Elaziouti, Abdelkader Debab
Summary: The biosorption capacity of untreated and chemically treated olive stones for removing COD from landfill leachate was investigated in this study. The results showed that the chemically treated olive stones had higher COD removal efficiency and could be employed as an inexpensive and effective biosorbent for stabilized leachate treatment. These findings also provided baseline information and design assistance for leachate treatment at the Hassi Bounif Sanitary Landfill and other sanitary landfills in Algeria.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Review
Environmental Sciences
Hamidi Abdul Aziz, Siti Fatihah Ramli, Yung-Tse Hung
Summary: Leachate generation is a challenging issue in landfills, as it carries harmful pollutants. Current solutions involve multi-stage treatments to address high concentrations of BOD, COD, colour, and NH3-N. This review paper focuses on the remediation of landfill leachate with high COD, colour, and NH3-N levels and low biodegradability, particularly in old landfills in developing countries. It also discusses a potentially sustainable landfill design and offers recommendations for future prospects, specifically in Malaysia and other developing countries with similar characteristics.
Article
Environmental Sciences
Toshimi Nakajima, Mao Kuragano, Makoto Yamada, Ryo Sugimoto
Summary: This study compared the contribution of submarine groundwater discharge (SGD) to river nutrient budgets at nearshore and embayment scales, and found that SGD-derived nutrients become more important at larger spatial scales.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Fan Liu, Lei Zhang, Chongyang Zhang, Ziguang Chen, Jingguang Li
Summary: NO2 emissions from wall-mounted gas stoves used for household heating have become a significant source of indoor pollution in Chinese urban areas. The high indoor concentration of NO2 poses potential health risks to residents. It is urgently necessary to establish relevant regulations and implement emission reduction technologies to reduce NO2 emissions from wall-mounted gas stoves.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Letter
Environmental Sciences
Hans Peter H. Arp, Raoul Wolf, Sarah E. Hale, Sivani Baskaran, Juliane Gluege, Martin Scheringer, Xenia Trier, Ian T. Cousins, Harrie Timmer, Roberta Hofman-Caris, Anna Lennquist, Andre D. Bannink, Gerard J. Stroomberg, Rosa M. A. Sjerps, Rosa Montes, Rosario Rodil, Jose Benito Quintana, Daniel Zahn, Herve Gallard, Tobias Mohr, Ivo Schliebner, Michael Neumann
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Philomina Onyedikachi Peter, Binessi Edouard Ifon, Francois Nkinahamira, Kayode Hassan Lasisi, Jiangwei Li, Anyi Hu, Chang-Ping Yu
Summary: This study investigates the relationship between dissolved organic matter (DOM) and Rare Earth Elements (REEs) in sediments from Yundang Lagoon, China. The results show four distinct fluorescent components, with protein-like substances being the most prevalent. Additionally, the total fluorescence intensity and LREE concentrations exhibit a synchronized increase from Outer to Inner to Songbai Lake core sediments. The findings demonstrate a strong correlation between DOM content and pollution levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Surya Gupta, Pasquale Borrelli, Panos Panagos, Christine Alewell
Summary: The objective of this study is to incorporate soil hydraulic properties into the erodibility factor (K) of USLE-type models. By modifying and improving the existing equations for soil texture and permeability, the study successfully included information on saturated hydraulic conductivity (Ksat) into the calculation of K factor. Using the Random Forest machine learning algorithm, two independent K factor maps with different spatial resolutions were generated. The results show that the decrease in K factor values has a positive impact on the modeling of soil erosion rates.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jesmin Akter, Wendy J. M. Smith, Yawen Liu, Ilho Kim, Stuart L. Simpson, Phong Thai, Asja Korajkic, Warish Ahmed
Summary: The choice of workflow in wastewater surveillance has a significant impact on SARS-CoV-2 concentrations, while having minimal effects on HF183 and no effect on HAdV 40/41 concentrations. Certain components in the workflow can be interchangeable, but factors such as buffer type, chloroform, and homogenization speed can affect the recovery of viruses and bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yu Luo, Xueting Yang, Diwei Wang, Hongmei Xu, Hongai Zhang, Shasha Huang, Qiyuan Wang, Ningning Zhang, Junji Cao, Zhenxing Shen
Summary: Atmospheric PM2.5, which can generate reactive oxygen species (ROS), is associated with cardiorespiratory morbidity and mortality. The study found that both the mass concentration of PM2.5 and the DTT activity were higher during the heating season than during the nonheating season. Combustion sources were the primary contributors to DTT activity during the heating season, while secondary formation dominated during the nonheating season. The study also revealed that biomass burning had the highest inherent oxidation potential among all sources investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Erin L. Murphy, Leah R. Gerber, Chelsea M. Rochman, Beth Polidoro
Summary: Plastic pollution has devastating consequences for marine organisms. This study uses a trait-based framework to develop a vulnerability index for marine mammals, seabirds, and sea turtles in Hawai'i. The index ranks 63 study species based on their vulnerability to macroplastic pollution, providing valuable information for species monitoring and management priorities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Kenji Maurice, Amelia Bourceret, Sami Youssef, Stephane Boivin, Liam Laurent-Webb, Coraline Damasio, Hassan Boukcim, Marc-Andre Selosse, Marc Ducousso
Summary: Growing pressure from climate change and agricultural land use is destabilizing soil microbial community interactions. Little is known about microbial community resistance and adaptation to disturbances, hindering our understanding of recovery latency and implications for ecosystem functioning. This study found that anthropic disturbance and natural disturbance have different effects on the topology and stability of soil microbial networks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yunhao Li, Yali Feng, Haoran Li, Yisong Yao, Chenglong Xu, Jinrong Ju, Ruiyu Ma, Haoyu Wang, Shiwei Jiang
Summary: Deep-sea mining poses a serious threat to marine ecosystems and human health by disturbing sediment and transmitting metal ions through the food chain. This study developed a new regenerative adsorption material, OMN@SA, which effectively removes metal ions. The adsorption mechanism and performance of the material for metal ion fixation were investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Antonio Medici, Margherita Lavorgna, Marina Isidori, Chiara Russo, Elena Orlo, Giovanni Luongo, Giovanni Di Fabio, Armando Zarrelli
Summary: Valsartan, a widely used antihypertensive drug, has been detected in high concentrations in surface waters due to its unchanged excretion and incomplete degradation in wastewater treatment plants. This study investigated the degradation of valsartan and identified 14 degradation byproducts. The acute and chronic toxicity of these byproducts were evaluated in key organisms in the freshwater trophic chain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jiang Lin, Lianbao Chi, Qing Yuan, Busu Li, Mingbao Feng
Summary: This study investigated the photodegradation behavior and product formation of two representative pharmaceuticals in simulated estuary water. The study found that the formed transformation products of these pharmaceuticals have potential toxicity on marine organisms, including oxidative stress and damage to cellular components.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Hua Fang, Dongdong Jiang, Ye He, Siyi Wu, Yuehong Li, Ziqi Zhang, Haoting Chen, Zixin Zheng, Yan Sun, Wenxiang Wang
Summary: This study revealed that exposure to lower levels of air pollutants led to decreased pregnancy rates, with PM10, NO2, SO2, and CO emerging as the four most prominent pollutants. Individuals aged 35 and above exhibited heightened susceptibility to pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Ali Shaan Manzoor Ghumman, Rashid Shamsuddin, Amin Abbasi, Mohaira Ahmad, Yoshiaki Yoshida, Abdul Sami, Hamad Almohamadi
Summary: In this study, inverse vulcanized polysulfides (IVP) were synthesized by reacting molten sulfur with 4-vinyl benzyl chloride, and then functionalized using N-methyl D-glucamine (NMDG). The functionalized IVP showed a high mercury adsorption capacity and a machine learning model was developed to predict the amount of mercury removed. Furthermore, the functionalized IVP can be regenerated and reused, providing a sustainable and cost-effective adsorbent.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Rita Bonfiglio, Renata Sisto, Stefano Casciardi, Valeria Palumbo, Maria Paola Scioli, Erica Giacobbi, Francesca Servadei, Gerry Melino, Alessandro Mauriello, Manuel Scimeca
Summary: This study investigated the presence of aluminum in human colon cancer samples and its potential association with biological processes involved in cancer progression. Aluminum was found in tumor areas of 24% of patients and was associated with epithelial to mesenchymal transition (EMT) and cell death. Additional analyses revealed higher tumor mutational burden and mutations in genes related to EMT and apoptosis in aluminum-positive colon cancers. Understanding the molecular mechanisms of aluminum toxicity may improve strategies for the management of colon cancer patients.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)