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911.
中空柱状生物膜载体在处理工业废水工程中的应用 总被引:5,自引:0,他引:5
本文介绍新开发的一种在污水处理中的高科技产品一高效生物膜载体,通过对其在与其他处理方式各方面择比研究过程中的高找到其特点,推广新科技。 相似文献
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913.
长光路FTIR研究OH发生体系中的OH浓度 总被引:2,自引:0,他引:2
利用长光路FTIR测定早苯、三本等芳香烃化合物在烟雾箱中光化学反应衰减,确字了NOx-H2O、Air、HONO-H2O-Air和CH3ONO-NO-Air3种体系在我灯自夸下的OH浓度,结果表明三者OH浓度范围分别为:~10^5~10^6、~10^7、~10^7~10^8molecules.cm^-3,并进一步讨论了反应前体物对生成OH浓度的影响。 相似文献
914.
Dale Toetz Letong Tang Daniel E. Storm Timothy Mihuc Michael D. Smolen 《Journal of the American Water Resources Association》1999,35(4):853-865
ABSTRACT: Predicting stream eutrophication potential from non-point source nutrient loading across large temporal and spatial scales is a significant problem. In this paper we describe how two physiological indicators of P stress of stream bioflims, alkaline phosphatase activity (APA) and stored (surplus) P relate to two predictors of P loading: annual P loading predicted by the watershed model SIMPLE, and stream concentrations of soluble reactive P (SRP) in eight subbasins in the illinois River basin in Oklahoma. Data for APA, surplus P, nutrients and water chemistry were obtained at watershed outlets once during the cold season and twice during the warm season. There was a negative curvilinear relationship between APA and both predictors. Best fit was achieved by APA vs. annual predicted P loading. Both SRP and P. load are potentially useful to identify subbasins requiring no pollution abatement and to establish a regional target for P-load reduction. Surplus P is not as useful as APA in establishing these thresholds. 相似文献
915.
He Yuan Zhang Tao Lv Li Tang Wenxiang Wang Yan Zhou Jiabei Tang Shengwei 《Environmental Chemistry Letters》2023,21(6):3245-3271
Environmental Chemistry Letters - Microbubbles are 10–100-μm bubbles with unique properties that find applications in chemical reactions, water aeration, sewage purification,... 相似文献
916.
Caiyan Qu Lushan Li Fan Feng Kainian Jiang Xing Wu Muchuan Qin Jia Tang Xi Tang Ruiyang Xiao Di Wu Chongjian Tang 《Frontiers of Environmental Science & Engineering》2023,17(9):115
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The biosafety of methyl tertiary-butyl ether (MTBE), mainly used as a gasoline additive, has long been a contentious topic. In addition to its routine toxicities, MTBE has been demonstrated to disrupt glucose and lipid metabolism and contribute to the development of type 2 diabetes as well as obesity. As one of the morbidities related to dyslipidemia, atherosclerosis is worthy of being investigated under MTBE exposure. Since foam cells derived from macrophages play pivotal roles during atherosclerosis development, we studied the effects of MTBE on macrophages in vitro and assessed the effect of MTBE on atherosclerosis plaque formation with the ApoE?/? mouse model in vivo for the first time. Our results demonstrated that exposure to MTBE at environmentally relevant concentrations decreased the expression of ABCA1 and ABCG1, which are responsible for macrophage cholesterol efflux, at both mRNA and protein levels in THP-1 macrophages. Consequently, treatment with MTBE inhibited the transport of cholesterol from macrophages to High-density lipoprotein. ApoE?/? mice exposed to MTBE at environmentally relevant concentrations (100, 1000 μg/kg) displayed significant increases in lesion area in the aorta and aortic root compared to vehicle-treated ones. Further analysis indicated that MTBE exposure enhanced the macrophage-specific marker Mac-2 contents within plaques in the aortic root, implying that MTBE could promote macrophage-derived foam cell formation and thus accelerate atherosclerosis plaque formation. We for the first time demonstrated the pro-atherogenic effect of MTBE via eliciting disruption of macrophage cholesterol efflux and accelerating foam cell formation and atherosclerosis plaque development. 相似文献
920.
Xuwang Zhang Zhaojian Song Qidong Tang Minghuo Wu Hao Zhou Lifen Liu Yuanyuan Qu 《环境科学学报(英文版)》2021,33(3):373-381
Nitrogen-containing organic pollutants (quinoline, pyridine and indole) are widely distributed in coking wastewater, and bioaugmentation with specific microorganisms may enhance the removal of these recalcitrant pollutants. The bioaugmented system (group B) was constructed through inoculation of two aromatics-degrading bacteria, Comamonas sp. Z1 (quinoline degrader) and Acinetobacter sp. JW (indole degrader), into the activated sludge for treatment of quinoline, indole and pyridine, and the non-bioaugmented activated sludge was used as the control (group C). Both groups maintained high efficiencies (> 94%) for removal of nitrogen-containing organic pollutants and chemical oxygen demand (COD) during the long-term operation, and group B was highly effective at the starting period and the operation stage fed with raw wastewater. High-throughput sequencing analysis indicated that nitrogen-containing organic pollutants could shape the microbial community structure, and communities of bioaugmented group B were clearly separated from those of non-bioaugmented group C as observed in non-metric multidimensional scaling (NMDS) plot. Although the inoculants did not remain their dominance in group B, bioaugmentation could induce the formation of effective microbial community, and the indigenous microbes might play the key role in removal of nitrogen-containing organic pollutants, including Dokdonella, Comamonas and Pseudoxanthomonas. Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) analysis suggested that bioaugmentation could facilitate the enrichment of functional genes related to xenobiotics biodegradation and metabolism, probably leading to the improved performance in group B. This study indicated that bioaugmentation could promote the removal of nitrogen-containing organic pollutants, which should be an effective strategy for wastewater treatment. 相似文献