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471.
以某油井钻井废水经高效混凝+吸附过滤处理后的出水为研究对象,采用Fe/Cu/C微电解对钻井废水进行深度处理研究。结果表明,Fe/Cu/C微电解的最佳工艺条件为:Fe/Cu/C质量比为7∶3∶10,Fe/Cu/C投加量为1 000 g/L,pH为3.0,气水比为54∶1,反应时间为180 min;Fe/Cu/C微电解对钻井废水深度处理的效能十分显著,在最佳工艺条件下,废水COD质量浓度由428.63 mg/L降至98.32 mg/L,COD去除率达到77.06%。 相似文献
472.
J. Nyćkowiak J. Leśny L. Merbold S. Niu E. Haas R. Kiese K. Butterbach-Bahl J. Olejnik 《Regional Environmental Change》2014,14(3):1073-1082
Nitrogen fertilization (N) is commonly known as a main source of direct nitrous oxide (N2O) emission from agricultural soils. An area of 38 % of the total land surface of Poland was covered by agricultural soils in 2009. In this paper, we aimed at analyzing data regarding the land exploitation for 13 selected subareas of Poland between 1960 and 2009. Seven out of the 13 subareas studied are located in the West (area A), and six subareas are located in southeast of Poland (area B). The total area covered by large farms (>20 ha) differed largely, between area A (10.6 %) and area B (0.9 %) in 2009. Both areas varied in terms of the amount of fertilizers used annually, average crop yield and crop structure. Average direct emissions of N2O from agricultural soils were 1.66 ± 0.09 kg N2O–N ha?1 a?1 for area A, 1.39 ± 0.07 kg N2O–N ha?1 a?1 for area B and 1.46 ± 0.07 kg N2O–N ha?1 a?1 for the whole country between 1960 and 2009. 相似文献
473.
The linear accumulation of atmospheric mercury by vegetable and grass leaves: Potential biomonitors for atmospheric mercury pollution 总被引:3,自引:0,他引:3
Zhenchuan Niu Xiaoshan Zhang Sen Wang Zhijia Ci Xiangrui Kong Zhangwei Wang 《Environmental science and pollution research international》2013,20(9):6337-6343
One question in the use of plants as biomonitors for atmospheric mercury (Hg) is to confirm the linear relationships of Hg concentrations between air and leaves. To explore the origin of Hg in the vegetable and grass leaves, open top chambers (OTCs) experiment was conducted to study the relationships of Hg concentrations between air and leaves of lettuce (Lactuca sativa L.), radish (Raphanus sativus L.), alfalfa (Medicago sativa L.) and ryegrass (Lolium perenne L.). The influence of Hg in soil on Hg accumulation in leaves was studied simultaneously by soil Hg-enriched experiment. Hg concentrations in grass and vegetable leaves and roots were measured in both experiments. Results from OTCs experiment showed that Hg concentrations in leaves of the four species were significantly positively correlated with those in air during the growth time (p?<?0.05), while results from soil Hg-enriched experiment indicated that soil-borne Hg had significant influence on Hg accumulation in the roots of each plant (p?<?0.05), and some influence on vegetable leaves (p?<?0.05), but no significant influence on Hg accumulation in grass leaves (p?>?0.05). Thus, Hg in grass leaves is mainly originated from the atmosphere, and grass leaves are more suitable as potential biomonitors for atmospheric Hg pollution. The effect detection limits (EDLs) for the leaves of alfalfa and ryegrass were 15.1 and 22.2 ng g–1, respectively, and the biological detection limit (BDL) for alfalfa and ryegrass was 3.4 ng m–3. 相似文献
474.
Nan Bao Yuan Li Xiao-Hong Yu Jun-Jian Niu Guo-Lin Wu Xiao-Hong Xu 《Environmental science and pollution research international》2013,20(2):897-906
Textile dye effluents are typically characterized by strong color and recalcitrance, even at very low concentration. The process of enrichment of anionic azo dye on the surface of TiO2 fibers followed by photosensitization degradation under ambient air conditions was extensively investigated. Adsorption isotherms and zeta potentials were used to describe the “dye/TiO2 surface” interface, taking into account the effects of pH on the nature and population of the surface groups on the TiO2 fibers. The extent of the photocatalytic degradation of dye on TiO2 surface was determined by FTIR. N2 adsorption isotherms and optical spectra were employed to investigate the effect of photosensitization. The adsorption of dyes on the TiO2 surface occurs via electrostatic attraction through the formation of single- or multidentate-coordinated surface complexes. Almost complete photobleaching of the absorption band at 534 nm is achieved in ~4 h. Dye-sensitized TiO2 fiber could absorb part of the visible light spectrum (λ?<?600 nm). Interfacial electron transfer can potentially alter the degradation efficiency. The regenerated TiO2 fiber could be reused for subsequent decolorization without a decline in adsorption efficiency compared with freshly prepared TiO2 samples, which may be attributed to preservation of the hierarchical pore structure and restoration of the original surface properties. In summary, we propose an efficient “adsorption–photoregeneration–reuse” process applying TiO2 fibers for the degradation of dyes in water. 相似文献
475.
476.
采用共沉淀法合成出一系列镁铝摩尔比不同的碳酸根型水滑石(LDHs),经500℃高温煅烧制备出镁铝复合氧化物CLDH,并用X-射线、红外光谱对它们进行表征。考查了吸附剂投加量、反应时间、初始pH值等因素对LDHs和CLDH处理阴离子染料活性艳红X-3B模拟废水效果的影响,并对吸附机理进行探讨。实验结果表明:以镁铝摩尔比为3∶1时制得的水滑石对活性艳红X-3B溶液的脱色效果最好。水滑石LDHs及其焙烧产物CLDH对活性艳红X-3B染料均具有较好的吸附性能,最佳反应时间分别为60 min和30 min;在较宽的pH范围内二者的脱色性能稳定,且CLDH对该染料的吸附效果要优于LDHs。LDHs及CLDH对活性艳红X-3B的吸附结果符合Langmuir吸附等温式,25℃下饱和吸附量分别为263.77 mg/g和875.23 mg/g。LDHs及CLDH的吸附机理分别为离子交换和层状结构重建。饱和吸附后的CLDH用高温热解法再生,吸附性能良好,随再生次数增多,脱色率下降。 相似文献
477.
Photolysis of Enrofloxacin in aqueous systems under simulated sunlight irradiation: Kinetics, mechanism and toxicity of photolysis products 总被引:4,自引:0,他引:4
Photolysis of Enro in water was investigated under simulated sunlight irradiation using a Xenon lamp. The results showed that Enro photolysis followed apparent first-order kinetics. Increasing Enro concentration from 5.0 to 40.0 mg L−1 led to the decrease of the photolysis rate constant from 1.6 × 10−2 to 3.0 × 10−3 min−1. Compared with the acidic and basic conditions, the photolysis rate was faster at neutral condition. Both of nitrate and humic acid can markedly decrease the photolysis rate of Enro because they can competitively absorb photons with Enro. The electron spin resonance and reactive oxygen species scavenging experiments indicated that Enro underwent self-sensitized photooxidation via OH and 1O2. After irradiation for 90 min, only 13.1% reduction of TOC occurred in spite of fast photolysis of 58.9% of Enro, indicating that Enro was transformed into intermediates without complete mineralization. The photolysis of Enro involved three main pathways: decarboxylation, defluorination, and piperazinyl N4-dealkylation. The bioluminescence inhibition rate using Vibrio fischeri increased to 67.2% at 60 min and then decreased to 56.9% at 90 min, indicative of the generation of some more toxic intermediates than Enro and then the degradation of the intermediates. The results will help us understand fundamental mechanisms of Enro photolysis and provide insight into the potential fate and transformation of Enro in surface waters. 相似文献
478.
Quantification of net carbon flux from plastic greenhouse vegetable cultivation: a full carbon cycle analysis 总被引:1,自引:0,他引:1
Wang Y Xu H Wu X Zhu Y Gu B Niu X Liu A Peng C Ge Y Chang J 《Environmental pollution (Barking, Essex : 1987)》2011,159(5):1427-1434
Plastic greenhouse vegetable cultivation (PGVC) has played a vital role in increasing incomes of farmers and expanded dramatically in last several decades. However, carbon budget after conversion from conventional vegetable cultivation (CVC) to PGVC has been poorly quantified. A full carbon cycle analysis was used to estimate the net carbon flux from PGVC systems based on the combination of data from both field observations and literatures. Carbon fixation was evaluated at two pre-selected locations in China. Results suggest that: (1) the carbon sink of PGVC is 1.21 and 1.23 Mg C ha−1 yr−1 for temperate and subtropical area, respectively; (2) the conversion from CVC to PGVC could substantially enhance carbon sink potential by 8.6 times in the temperate area and by 1.3 times in the subtropical area; (3) the expansion of PGVC usage could enhance the potential carbon sink of arable land in China overall. 相似文献
479.
480.
Gu Zhaolin Han Jie Zhang Liyuan Wang Hongliang Luo Xilian Meng Xiangzhao Zhang Yue Niu Xinyi Lan Yang Wu Shaowei Cao Junji Lichtfouse Eric 《Environmental Chemistry Letters》2023,21(2):725-739
Environmental Chemistry Letters - Policies and measures to control pandemics are often failing. While biological factors controlling transmission are usually well explored, little is known about... 相似文献