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- 저자 : Ambade Balram (검색결과 2 건)
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Linda Maharjan,Lekhendra Tripathee,Shichang Kang,Balram Ambade,Pengfei Chen,Huijun Zheng,Quanlian Li,Kundan Lal Shrestha,Chhatra Mani Sharma 한국대기환경학회 2021 Asian Journal of Atmospheric Environment (AJAE) Vol.15 No.4
This study was conducted in the Central Himalayan middle hills to understand the nature of polycyclic aromatic hydrocarbons (PAHs) embedded in aerosol particles, their sources and human health risk assessments. The level of sum of 15 particlephase PAHs was between 9 and 335 ng/m3, with an average concentration of 73±66 ng/ m3. There were strong seasonal differences in total suspended particles (TSP) and particle- bound PAH concentrations with higher concentrations in winter, followed by premonsoon and lowest in monsoon. The main contributor to the suspended particles was 5-ring PAHs (32%), followed by 4-ring (29%), 6-ring (28%), and 3-ring PAHs (11%). Conversely, the gas-phase PAHs showed that 3-ring PAHs contributed utmost to the total particles. The molecular ratios and principal component analysis indicated that both petrogenic and pyrogenic sources, particularly fossil fuel combustion, biomass combustion, and car exhausts, were the major sources of PAHs. The overall average Benzo (a)pyrene equivalent concentration of particulate PAHs was 11.71 ng/m3, which substantially exceeded the WHO guideline (1 ng/m3), and indicated the potential health risks for local residents. The average lifetime inhalation cancer risk (ILCR) estimates associated with carcinogenic PAHs was 8.78×10-6 for adults, suggesting the possible cancer risk and 2.47×10-5 for children, signifying extreme carcinogenic effects of PAHs on children’s health. Therefore, strict measures should be taken to reduce PAHs emissions in the region.
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Potential hydrometallurgical processes to recycle metals from discarded personal computer
Dinkar Om Shankar,Parween Rukshana,Panda Rekha,Choubey Pankaj Kumar,Ambade Balram,Jha Manis Kumar 한국자원공학회 2022 Geosystem engineering Vol.25 No.3
Rapid technological modernization has accelerated the replacement of older electronic goods with newer ones, which has led to the generation of huge quantities of discarded electronic items at its end-of-life, known as electronic wastes (e-wastes). The growing quantity of e-wastes has become a major threat to the society as well as environment. On the other hand, e-wastes contain several valuable metals and materials of high economic value, which compels researchers to work in the area for secondary resources for metal recovery. Metal recovery from such secondary resources will not only preserve the primary resources but also reduce the loss of valuable metals/materials, protect the environment from their hazardous effects as well as reduce the demand-supply gap of metals up to some extent. In view of the above, present study is focused on the possible effort to figure out variety of metals present in the component of waste personal computers (WPCs) as well as different recycling processes implemented for the efficient recovery of metals.
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