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THE EFFECTS OF PHENOL AND SOME ALKYL PHENOLICS ON BATCH ANAEROBIC METHANOGENESIS

WATER RESEARCH 1984年第3期18卷 361-367页

作者： FEDORAK, PM HRUDEY, SE Environmental Engineering and Science Program Department of Civil Engineering University of Alberta Edmonton Alberta Canada T6G 2G7

Phenol and seven alkylphenols ( o -, m - and p -cresol, 2.5-, 2.6-, 3.4- and 3,5-dimethylphenol) were added at various concentrations to aliquots of domestic anaerobic sludge in Hungate serum bottles and these were incubated at 37°C. The concentration of methane in the headspace gas was monitored to determine if the phenolics were fermented to methane or if they inhibited the anaerobic process. Only phenol and p -cresol were fermented to methane. At 500 mg l −1 (but not at 300 mg l −1 ) 2,5-, 3,4- and 3,5-dimethylphenol reduced the rate and the amount of methane produced. The cresols were inhibitory at 1000 mg l −1 but not at 400 mg l −1 . In cultures supplemented with acetate and propionate (VOA), and in unsupplemented cultures, phenol at concentrations up to 500 mg l −1 was fermented to methane. Between 800 and 1200 mg l −1 phenol, methane production was neither enhanced nor inhibited relative to control cultures containing no phenol. Inhibition of methane production was evident when phenol was present at ⩾ 2000 mg l −1 . Thus the methanogens are less susceptible to phenol inhibition than are the phenol-degrading acid formers. In similar experiments with p -cresol: enhanced methane production was observed at concentrations of ⩽ 400 mg l −1 ; no enhancement or inhibition was observed at 600 mg l −1 ; and inhibition was noted when p -cresol was present at ⩾ 1000 mg l −1 .

关键词： phenolics methane anaerobic digestion phenol p -cresol inhibition

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BINATIONAL MANAGEMENT OF HAZARDOUS-WASTE - THE MAQUILADORA INDUSTRY AT THE UNITED-STATES MEXICO BORDER

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environmental MANAGEMENT 1990年第4期14卷 441-450页

作者： PERRY, DM SANCHEZ, R GLAZE, WH MAZARI, M 1. Environmental Science and Engineering Program School of Public Health University of California 90024-1772 Los Angeles California USA

Foreign-owned industry in the form of assembly plants, termed maquiladora, has become very important in Mexico to the extent that it represents the second largest source of foreign exchange and is a valuable source for employment and regional development. The economic prosperity gained from the rapid growth of the maquiladora industry has been accomapanied by increased environmental and human health risks associated with generation of hazardous waste. Diversification of industry has resulted in the predomination of those sectors that likely use hazardous substances. The Mexicali-Calexico border region was selected to demonstrate the potential for environmental and health risks associated with the generation of hazardous waste. Estimates for the generation of hazardous waste were obtained from 34 maquiladora plants in Mexicali, represented by the electronic and electronic equipment and parts, mechanical and transportation equipment, and toys and sporting equipment sectors. Repeated detection of volatile organic compounds in the New River at the US-Mexico border suggests that hazardous waste from the printed circuit board industry in Mexicali is not being disposed of in a proper manner. Potential adverse health effects, such as carcinogenic and mutagenic responses associated with the detected volatiles, are discussed. US and Mexico national legislation and the Binational environmental Agreement were examined for their adequacy to ensure proper management of hazardous waste generated by the maquiladora industry. environmental policy options are presented that focus on: (1) increased environmental accountability of US parent companies for their maquiladora assembly plants in Mexico;and (2) more integration between US Customs and border states with the US environmental Protection Agency to improve the binational management of hazardous waste generated by the maquiladora industry.

关键词： Hazardous waste Maquiladora industry environmental policy US-Mexico border

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Eco-friendly moxifloxacin removal using date seed waste and Ni-Fe LDH: Adsorption efficiency and antimicrobial potential

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Ecotoxicology and environmental Safety 2025年 297卷 118256页

作者： Mahmoud, Ahmed Abo El-Ela, Fatma I. Mahmoud, Rehab Shehata, Ayman Z. El-Raheem, Hany Abd Salama, Esraa Allam, Ahmed A. Alfassam, Haifa E. Zaher, Amal Environmental Science and Industrial Development Department Faculty of Postgraduate Studies for Advanced Sciences Beni-Suef University Beni-Suef 62511 Egypt Department of Pharmacology Faculty of Veterinary Medicine Beni-Suef University Beni-Suef 62511 Egypt Chemistry Department Faculty of Science Beni-Suef University Beni-Suef 62511 Egypt Department of Food Safety and Technology Faculty of Veterinary Medicine Beni-Suef University Beni-Suef Egypt Centre of Excellence for Trace Analysis and Biosensor Division of Physical Science Faculty of Science Prince of Songkla University Songkhla Hat Yai 90110 Thailand Environmental Engineering Program Zewail City of Science and Technology October Gardens 6th of October Giza 12578 Egypt Department of Biology College of Science Imam Mohammad Ibn Saud Islamic University Riyadh 11623 Saudi Arabia Department of Biology college of Science Princess Nourah bint Abdulrahman University P.O. BOX 84428 Riyadh 11671 Saudi Arabia

Background: New pharmacological remediation techniques were needed due to their detrimental impacts on human health and aquatic ecosystems. Layer double hydroxide (LDH) can be made inexpensively and readily available using easy preparation techniques. Three nanomaterials date seed powder (DSP), Ni-Fe LDH, and Ni-Fe LDH/(DSP) composite are used to eliminate Moxifloxacin (MOX). Objective: Providing the date seed powder (DSP), Ni-Fe LDH, and Ni-Fe LDH/(DSP) composite multifunction as an ecofriendly adsorbents for antibiotic residues also its assessing antibacterial effectiveness in addition to other fungal organisms. Methods: The catalysts were synthesized via co-precipitation and characterized using HRTEM, FESEM, FT-IR, X-ray, PZC and BET analyses. Adsorption experiments were conducted to evaluate the effects of pH, adsorbent dose, and contact time, while kinetic and isotherm models were employed to elucidate the adsorption mechanisms. Minimum Inhibitory Concentration (MIC), Minimum Fungicidal Concentration (MFC), Minimum Bactericidal Concentration (MBC), and Disc Diffusion assays for bacterial activity were applied for antifungal study. Results: The removal percent of the MOX was 35.37 % at pH 3, 44.91 % at pH 7, and 83.50 % at pH 5 for (DSP), Ni-Fe LDH and Ni-Fe LDH /(DSP) composite, respectively. The Langmuir- Freundlich model is the best suitable model for three nanomaterials (DSP), Ni-Fe LDH and Ni-Fe LDH /(DSP), R² were (0.97,0.99 and 0.99, respectively) and q_max were (212.77, 206.7 and 251,6 respectively). Conclusion: current research indicates that the Ni-Fe LDH/(DSP) composite is a promising nanomaterial for treating wastewater and has a greater antimicrobial efficacy than each alone against both bacterial and fungal pathogens. © 2025 The Authors

关键词： Adsorption Antibiotic-resistant pathogens Biomaterial Date seeds LDH Mechanism MOX

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A PARTICLE INTERACTION-MODEL OF REVERSIBLE ORGANIC-CHEMICAL SORPTION

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CHEMOSPHERE 1985年第10期14卷 1503-1538页

作者： DITORO, DM Environmental Engineering and Science Program Manhattan College Manhattan College Parkway Bronx N.Y. 10471 U.S.A.

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Dual functional antibacterial nanofiber membranes: Polyhexamethylene biguanide-integrated alginate-chitosan-dye modified polyamide 56 for single-use biomedical applications

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International Journal of Biological Macromolecules 2025年 310卷 143331页

作者： Liao, Ting-Cjia Le, Quang-Vinh Hanh, Nguyen The Duc Liu, Bing-Lan Srinophakun, Penjit Prapainainar, Paweena Chiu, Chen-Yaw Wang, Chi-Yun Ng, I-Son Chen, Kuei-Hsiang Chang, Yu-Kaung of Biochemical Engineering Ming Chi University of Technology New Taipei City243303 Taiwan Center for Environmental Sustainability and Human Health Ming Chi University of Technology Taishan New Taipei City243303 Taiwan Department of Applied Chemistry Chaoyang University of Technology Taichung413310 Taiwan National Center of Excellence for Petroleum Petrochemicals and Advance Material Department of Chemical Engineering Faculty of Engineering Kasetsart University Chatuchak Bangkok10900 Thailand Center for Advanced Studies in Nanotechnology for Chemical Food and Agricultural Industries Kasetsart University Chatuchak Bangkok10900 Thailand Department of Chemical Engineering Ming Chi University of Technology New Taipei City243303 Taiwan International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City243303 Taiwan Departmental of Chemical Engineering National Cheng Kung University Tainan70101 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Zhongli Dist. Taoyuan City320315 Taiwan

Polyamide 56 (PA56) nanofiber membranes were functionalized with alginate (AG), chitosan (CS), reactive dyes (RG19, RR141), and poly(hexamethylene biguanide) (PHMB) to develop multifunctional antimicrobial membranes for single-use applications. The resulting membranes, PA56-AG-CS-RG19-PHMB and PA56-AG-CS-RR141-PHMB, achieved high antibacterial efficiencies of 97.12 % and 90.65 %, respectively, against Escherichia coli, demonstrating potent bacterial inhibition. The antimicrobial performance results from a synergistic dual mechanism. Chitosan disrupts bacterial adhesion and biofilm formation through electrostatic interactions, while PHMB compromises membrane integrity and interferes with intracellular processes. This combined action enhances bactericidal efficacy. The functionalization strategy also maintained excellent biocompatibility, with minimal cytotoxicity observed in L929 fibroblasts. Optimized concentrations of AG and CS were systematically evaluated to ensure balanced antibacterial performance and mechanical stability. These membranes, designed for single-use, exhibited significantly reduced antibacterial activity upon reuse, supporting their intended application. Overall, the integration of chemical and physical antimicrobial strategies within a nanofiber matrix presents a novel and effective approach. This strategy enables the development of next-generation materials suitable for real-world single-use biomedical applications, including wound dressings, food packaging, and protective textiles. © 2025 Elsevier B.V.

关键词： Escherichia coli

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Development of nanostructured materials for the treatment and sensing of cyanotoxins and contaminants of emerging concern

Development of nanostructured materials for the treatment an...

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Water Quality Technology Conference and Exposition 2012

作者： Han, Changseok Pelaez, Miguel Dionysiou, Dionysios D. Environmental Engineering and Science Program School of Energy Environmental Biological and Medical Engineering University of Cincinnati Cincinnati OH United States

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Pre-treatment optimization to reduce membrane fouling during produced water treatment with an integrated FO-MD system

Science Talks

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science Talks 2025年 14卷

作者： Muhammad Saqib Nawaz Sofiane Soukane Muhammad Bilal Asif Veerabhadraiah Gudideni Sultan Alrubaish Noreddine Ghaffour Environmental Sciences and Engineering Program Division of Biological and Environmental Sciences and Engineering (BESE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Physical Sciences and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Energy Systems Division Process & Control Systems Department Saudi Aramco Dhahran Saudi Arabia

During oil exploration, fresh water that is injected into underground reservoirs returns to the surface loaded with hydrocarbons, salts, and other contaminants. This complex solution is typically known as produced water (PW). Generally, different PW streams are generated at a given site, which, after suitable treatment, are sent for re-injection for enhanced oil recovery or to disposal wells. However, there is a potential for water recovery from this hypersaline contaminated stream. Forward osmosis (FO) and membrane distillation (MD) are two low-pressure membrane treatment technologies successfully used in a single hybrid system for PW treatment. During operation, the key foulants on the FO membrane were CaSiO 3 , CaSO 4 , and NaCl, while for MD, they were SiO 2 and CaSO 4 plus emulsified oil, causing pore clogging. Some foulants were tightly bound and not removed by osmotic backwashing or hydraulic flushing, thus requiring pre-treatment. Different pre-treatment techniques, like ion exchange resins and polymeric and ceramic membrane-based ultrafiltration (UF), were assessed in this study. The resins were able to remove bivalent metallic ions successfully from lower concentration streams only and thus caused an increase in FO flux and a reduction in MD flux by disturbing the FO-MD system equilibrium. The higher concentrations of resins and chemicals required for their regeneration make them unsuitable for such applications. On the contrary, PW pre-treated with polymeric and ceramic UF membranes led to increased FO and MD fluxes without any chemical requirement and proved suitable for pre-treatment.

关键词： Pre-treatment Produced water Ion-exchange resins Ultrafiltration Forward osmosis Membrane distillation

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A critical review on electrocatalytic hydrodechlorination: Mechanism, influencing factors and optimization of Pd-based electrodes

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Journal of environmental Chemical engineering 2025年第3期13卷

作者： Kaizhou Kong Zilin Tan Junjing Li Bin Zhao Zhaohui Zhang Pengliang Jin Liang Wang Dionysios D. Dionysiou School of Environmental Science and Engineering Tiangong University State Key Laboratory of Advanced Separation Membrane Materials Binshui West Road 399 Xiqing District Tianjin 300387 PR China Cangzhou Institute of Tiangong University East side of No.13 Fengtai Park high-tech District Cangzhou 061019 PR China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering (ChEE) University of Cincinnati Cincinnati OH 45221-0012 USA

As water pollution becomes increasingly serious, electrocatalytic hydrodechlorination (EHDC) technology has been widely used to remove chlorinated pollutants from waterbody. Due to the research studies on this topic are increasing and gradually maturing, a summary of the mechanism, influencing factors, and electrode optimization for EHDC is needed. This review provides an outline of the research status for EHDC technology in the removal of chlorinated organic compounds (COCs). The progress for reaction mechanisms and electrocatalysts is systematically summarized, and the main properties and important role of palladium (Pd) in the EHDC process are explored. Meanwhile, a detailed introduction to the optimization of Pd-based catalysts, especially the alloying of Pd with a second metal, layered construction of Pd-based catalysts and new reactor configurations in reactor design, is provided. The influencing factors, including pH, potential, coexisting ions, and catalyst loading in the EHDC reaction and their effects on the reaction, are also explored. Finally, the future development direction and challenges for EHDC are discussed. This review will enrich the theoretical studies in the field of EHDC and give new inspirations to researchers.

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Development of hydroxyapatite-enhanced membrane for nanoplastics removal: multiple scenarios and mechanism exploration

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Journal of Hazardous Materials 2025年

作者： Mengna Li Guohe Huang Shuguang Wang Jing Huang Zeyuan Xu Environmental Systems Engineering Program University of Regina Regina Saskatchewan S4S 0A2 Canada China-Canada Center of Energy Environment and Sustainability Research UR-SDU School of Environmental Science and Engineering Shandong University Qingdao 266237 China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao 266237 China Department of Electrical Computer and Biomedical Engineering University of Pavia 27100 Pavia Italy

Nanoplastics (NPs) are widespread in wastewater systems and more toxic than microplastics (MPs), necessitating effective removal techniques. Although membranes can effectively remove MPs, their efficiency and mechanisms for NPs removal require further study. A novel hydroxyapatite functionalized PVDF (HAPF) membrane was developed for NPs removal. The optimized HAPF membrane was prepared via a one-step method with 800 mg/L HAP at pH 7.3 for 8 hours. It achieved a water flux of 4376.44 LMH, 3.4 times higher than that of the pristine PVDF membrane, while maintaining a polystyrene (PS) NPs rejection above 99.5%. The HAPF membrane maintained 95% of its pure water flux when treating wastewater with only PS NPs, but exhibited severe flux decline under varying conditions, such as surface-functionalized PS NPs, pH changes, or coexisting contaminants. Among these, the presence of MgSO 4 alongside PS NPs caused the most severe water flux reduction, with the HAPF membrane undergoing complete blocking, followed by the formation of a cake layer. XDLVO results revealed that there is an attractive interaction between the HAPF membrane and PS NPs, primarily driven by acid-base interaction. The HAPF membrane exhibited significantly lower R m and R f values than the PVDF membrane and achieved a flux recovery rate of 92.94% over multiple fouling-cleaning cycles. Its water flux was 18.9 times that of the PVDF membrane during long-term filtration. The developed HAPF membrane holds significant potential for advanced water treatment and fouling.

关键词： Hydroxyapatite functionalized PVDF (HAPF) membrane nanoplastic removal coexisting pollutants XDLVO theory Hermia theory

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Comparison of DNA damage and photoreactivation of E. coli after UV-C and UV/TiO2 irradiation

Comparison of DNA damage and photoreactivation of E. coli af...

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American Water Works Association Annual Conference and Exposition 2009, ACE 2009

作者： Zeng, Minzhen Shang, Chii Environmental Engineering Program Hong Kong University of Science and Technology Hong Kong

ISBN: (纸本)9781615676132

• E. coli DNA dimer repair is obstructed by UV/TiO2irradiation, probably resulting in subsequent photoreactivation repression effect. • The direct damage to the photoreactivating enzyme may not be the main reason to the repression of dimer repair. It requires further investigation. • The photoreactivation can be partially attributed to the increase of oxidative stress in bacteria by UV/TiO2 and UV/H2O2 irradiation. © 2009 American Water Works Association.

关键词： Repair

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