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Gawhane Ranjeeta D. Rao Pasumarthi Surya Prakasa Budhavant Krishnakant B. Waghmare Vinayak Meshram Dhananjay C. Safai Pramod D. 《Environmental science and pollution research international》2017,24(26):21065-21072
Environmental Science and Pollution Research - Particulate matter with size less than or equal to 2.5 μm (PM2.5) samples were collected from an urban site Pune, India, during April... 相似文献
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史璐涵 张颖仪 KUNWAR Bhagawati DESHMUKH Dhananjay Kumar KAWAMURA Kimitak 岳玎利 赵燕 赖森潮 《中国环境监测》2023,39(1):81-91
于2018年冬季在广州城区磨碟沙站点开展细颗粒物(PM2.5)样品采集,并获得PM2.5中水溶性离子、含碳组分、稳定碳氮同位素的组成及时间变化特征,重点讨论了PM2.5浓度升高时段的化学组成特征变化,进而利用稳定碳氮同位素变化特征探究了主要污染来源。结果表明:采样期间,研究站点PM2.5平均质量浓度为22.1μg/m3,共出现两个PM2.5浓度水平升高时段,所对应的平均质量浓度分别达46.0μg/m3和63.0μg/m3。风速降低、温度升高等不利气象条件是导致上述时段PM2.5浓度上升的重要原因。在上述时段,伴随着PM2.5浓度的升高,NO-3和NH+4浓度均出现显著升高,NO-3与SO2-4的摩... 相似文献
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Dhananjay Kumar J. P. Gaur 《Environmental science and pollution research international》2014,21(17):10279-10285
The present study explores the tolerance and metal removal response of a well-developed 2-week-old Phormidium mat after long-term exposure to Cu2+-enriched medium. Cu2+ enrichment inhibited increase in mat biomass in a concentration-dependent manner. Mat area and the number of entrapped air bubbles decreased as Cu2+ concentration increased in the medium. Decrease in number of air bubbles obviously reflects the adverse effect of Cu2+ on photosynthetic performance of the mat. Metal enrichment did not substantially alter the amount of pigments, such as chlorophyll a, chlorophyll b, carotenoids, and phycocyanin, in the mat. Enhancement of Cu2+ concentration in the medium led to changes in species composition of the test mat; however, Phormidium bigranulatum always remained the dominant organism. Relative share of green algae and some cyanobacterial taxa, namely, Lyngbya sp. and Oscillatoria tenuis, in the mat were increased by Cu2+ enrichment. The mat successfully removed 80 to 94 % Cu2+ from the growth medium containing 10 to 100 μM Cu2+. Extracellular polysaccharides, whose share increased in the mat community after metal addition, seem to have contributed substantially to metal binding by the mat biomass. 相似文献
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Shyamal Dhananjay Singh Sawai Ankita Kazmi Absar Ahmad 《Journal of Material Cycles and Waste Management》2022,24(3):835-851
Journal of Material Cycles and Waste Management - Improper management of solid waste creates health problems and degrades the environment (air, water, and soil). The Indian state Uttarakhand is... 相似文献
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Singh Deepak Singh Sunita Patel Suresh Kumar Sinha Shishir Arya Raj Kumar Singh Dhananjay 《Environmental science and pollution research international》2023,30(4):8416-8428
Environmental Science and Pollution Research - Food materials are consumed for nutritional purposes in the form of fruits, vegetables, plants, and meat. These contain proteins, carbohydrates, and... 相似文献
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Mathur AK Majumder CB Singh D Bala S 《Journal of environmental biology / Academy of Environmental Biology, India》2010,31(4):445-451
In the present study, performance of the trickle bed airbiofilter (TBAB) for treating mono-chlorobenzene (MCB) was evaluated for various influent volatile organic compound (VOC) loadings using coal and mixed consortium of activated sludge as the packing material. Microbial acclimation to MCB was achieved by exposing the system continuously for 31 d to an average inlet MCB concentration of 0.688 g m(-3) at an empty bed residence time (EBRT) of 188 s. The TBAB achieved maximum removal efficiency of 87% at an EBRT of 188 s for an inlet concentration of 0.681 g m(-3), which is quite significance than the values reported in the literature. Elimination capacities of MCB increased with an increase of the influent VOC loading, but an opposite trend was observed for the removal efficiency The maximum elimination capacity of the biofilter was 110.75 g m(-3) hr(-1) at an inlet MCB concentration of 1.47 g m(-3). The effect of starvation on the TBAB was also studied. After starvation, the TBAB lost its ability to degrade MCB initially However the biofilter recovered very quickly Evaluation of the concentration profile along the bed height indicated that the bottom section of TBAB has the best performance for all concentrations. By using Wani's method of macrokinetic determination based on simple Monod kinetics, the maximum removal rate of MCB, r(max) and saturation constant K(m) was to be found as 1.304 g m(-3)s(-1) and 113.446 g m(-3), respectively. 相似文献
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