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Gayatri Panthi,Rishikesh Bajagain,Dhiraj Kumar Chaudhary,Pil-Gon Kim,Jung-Hwan Kwon,Yongseok Hong 한국퇴적환경준설학회(구 한국환경준설학회) 2024 한국환경준설학회 학술대회논문집 Vol.2024 No.4
This study investigates the leaching of phthalates and non-phthalate plasticizers from commercial PVC and their abiotic and biotic degradation under various conditions (aerobic and anoxic) environments for biotic conditions, utilizing sediment water slurry. The microbial community and functional genes profile were also determined for different conditions. Interestingly, 35-79% of plasticizers were released into the sediment from the microplastics (MPs) within 30 day and >99.9% degradation was achieved. Although a significantly higher degradation was found in plasticizer-added microcosms under biotic processes (overall, 94%), there was a noticeable abiotic loss (72%), suggesting that abiotic processes also play a role in plasticizer degradation. Furthermore, changes in the bacterial community, abundance of plasticizer-degrading bacterial populations, and functional gene profiles were assessed. In all the microcosms, a decrease in bacterial community diversity and a notable shift in bacterial composition were observed.
Rishikesh Bajagain,Gayatri Panthi,Youn-Joo An,Seung-Woo Jeong 대한환경공학회 2020 대한환경공학회지 Vol.42 No.12
The use of hazardous metals like lead, cadmium in solar photovoltaics (PVs) are rapidly increasing which poses the risk to the environment due to potential release of these constituents. The main purpose of this review is to highlight the updated information on solar PV waste along with the present condition of efforts for recovery, country-wise regulatory approach or strategy on solar PV management and recycling. A brief literature review is assessed based on recently published articles and reports, which provides the readers a general overview on the solar PV waste management and regulations made by world leader countries in solar panels. This study discussed on the risk of hazardous chemical species releasing from PV modules and criteria of PV panel waste classification. Furthermore, the estimation of solar waste PV, its categorization, management approaches, country guidelines and recycling of waste PV panels, were mainly focused in this study. Apart from this, the major leaching tests carried out for waste classification and PV waste recycling in different countries are also discussed. Solar PV waste generally categorized as a general waste by the regulatory aspect, except in the EU, since PV panels in these countries are described as e-waste as stated in the Waste Electrical and Electronic Equipment (WEEE) Directive. To reinforce the recycling option, currently only Europe has mandated a strong regulatory guideline, however, other nations are preparing to set up particular system for solar panel waste management. In particular, this paper focuses on the potential risk caused by solar panels, data collection for PV waste and management approach like recycling. Besides, this review believes the basics of PV panel installation, management and recycling process which could recommend upcoming guidance for the public policymakers.