排序方式: 共有8条查询结果,搜索用时 15 毫秒
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Jiangnan Tian Ayobami Matthew Olajuyin Tingzhen Mu Maohua Yang Jianmin Xing 《Environmental science and pollution research international》2016,23(12):11574-11583
The electro-Fenton (EF) process treatment of 0.1-M (rhodamine B) RhB solution was studied with different graphite cathode materials, and graphite felt (GF) was selected as a promising material in further investigation. Then, the degradation performances of gas diffusion electrode (GDE) and graphite felt (GF) were compared, and GDE was confirmed to be more efficient in RhB removal. The operational parameters such as Fe2+ dosage and current density were optimized, and comparison among different modified methods—polytetrafluoroethylene-carbon black (PTFE-CB), polytetrafluoroethylene-carbon nanotube (PTFE-CNT), electrodeposition-CB, and electrodeposition-CNT—showed 98.49 % RhB removal by PTFE-CB-modified cathode in 0.05 M Na2SO4 at a current density of 50 A/m2 and an air flow rate of 1 L/min after 20 min. Meanwhile, after cathode modified by PTFE-CB, the mineralization efficiency and mineralization current efficiency performed absolutely better than the pristine one. Cyclic voltammograms, SEM images, contact angles, and BET surface area were carried out to demonstrate stronger current responses and higher hydrophilicity of GF after modified. The value of biochemical oxygen demand/chemical oxygen demand (BOD5/COD) increased from 0.049 to 0.331 after 90-min treatment, suggesting the solution was biodegradable, and the modified cathode was confirmed to be stable after ten circle runs. Finally, a proposed degradation pathway of RhB was put forward. 相似文献
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为探究生物膜脱氮滤池脱氮效能差异的微生物因素,设置组1(包括接种污泥、稳定期滤料、反冲洗后滤料微生物变化)和组2(包括反冲洗前滤料、反冲洗后不同时间段滤料微生物变化)两组实验,通过高通量测序,研究不同阶段微生物群落结构、丰度和多样性的分布情况.结果表明:接种污泥与滤料表面微生物群落结构和多样性在门水平下差异不大,但在属水平下差异显著,而相对丰度在两种分类水平下始终差异显著.反冲洗后0~4 h滤料表面微生物的OTU数目、Shannon指数、Chao1指数变化,在滤池30 cm处先升后降,而在60 cm处曲折上升,也即二者的微生物丰度和多样性变化趋势.反冲洗前后Proteobacteria始终占主导地位,相对丰度为79%~90%,Proteobacteria中Betaproteobacteria占主导优势,反冲洗后Betaproteobacteria数量相对减少,后逐渐恢复.总反硝化优势菌属相对丰度在反冲洗1 h后30 cm处由78%左右下降到70%左右,60 cm处由68%左右下降到64%左右,此时出水总氮达到最高值7.7 mg·L~(-1),之后总反硝化优势菌属及出水TN浓度逐渐恢复至正常水平,这种消长变化表明滤池脱氮效果与总反硝化优势菌属相对丰度密切相关,滤池运行状态的改变使得反硝化优势菌属的群落结构差异显著. 相似文献
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水体富营养化会引起蓝藻水华暴发,严重影响水生态系统健康,威胁饮用水安全,水体富营养化和蓝藻水华治理是当前我国湖库治理的难点.蓝藻水华治理技术主要聚焦于物理法、化学法和生物法3个方面.近年来,生物法因其兼具经济友好和环境友好的双重特点,逐渐受到国内外学者的关注.综述了目前生物控藻的3种主要方法(微生物法、植物法和动物法)... 相似文献
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Quantification of land use/land cover changes in Pearl River Delta and its impact on regional climate in summer using numerical modeling 总被引:2,自引:0,他引:2
Wenshi Lin Lu Zhang Dongsheng Du Limin Yang Hui Lin Yuanzhi Zhang Jiangnan Li 《Regional Environmental Change》2009,9(2):75-82
This study quantified land use/land cover (LULC) changes in Pearl River Delta (PRD) of South China and its impact on regional
climate over the last two decades. The LULC change analyses were accomplished by applying a change detection method to a set
of Landsat imagery and ancillary data acquired from 1970s to 2000. The results indicate that the urban expansion is the prevailing
LULC change in the PRD. Impact of LULC change on regional climate was simulated by using a mesoscale climate model. Two different
land cover datasets circa 1990 and 2000 were input to the model to investigate the impact of urbanization on regional weather
and climate condition in summer 2005. The simulation results show that rapid urban expansion can substantially alter regional
climate conditions in the PRD region including monthly mean temperature, precipitation, moisture, and surface heat fluxes. 相似文献
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