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251.
Yongpeng M Bailong Mu Xiaojing Zhang Hongzhong Zhang Haomiao Xu Zan Qu Li Gao 《环境科学学报(英文版)》2019,31(5):111-120
Hierarchical Ag-SiO_2@Fe_3O_4 magnetic composites were selected for elemental mercury(Hg~0) removal from non-ferrous metal smelting flue gas in this study. Results showed that the hierarchical Ag-SiO_2@Fe_3O_4 magnetic composites had favorable Hg~0 removal ability at low temperature. Moreover, the adsorption capacity of hierarchical magnetic composite is much larger than that of pure Fe_3O_4 and SiO_2@Fe_3O_4. The Hg~0 removal efficiency reached the highest value as approximately 92% under the reaction temperature of 150°C, while the removal efficiency sharply reduced in the absence of O_2. The characterization results indicated that Ag nanoparticles grew on the surface of SiO_2@Fe_3O_4 support. The large surface area of SiO_2 supplied efficient reaction room for Hg and Ag atoms. Ag–Hg amalgam is generated on the surface of the composites. In addition, this magnetic material could be easily separated from fly ashes when adopted for treating real flue gas, and the spent materials could be regenerated using a simple thermal-desorption method. 相似文献
252.
Fe2+-H2O2催化氧化加混凝处理苯酚磺酸废水 总被引:2,自引:0,他引:2
采用H2O2-Fe^2 催化氧化-混凝联合工艺对苯酚磺酸(PSA)废水进行了试验研究,对H2O2和Fe^2 的投加量、pH值、温度(T)、时间(t)等工艺参数进行了优选。结果表明,在H2O2/COD0(g/g)=1.5,H2O2/Fe^2 (moL/moL)=10:1、pH=3.0-4.0、T=30℃、t=30min的条件下,COD为1198mg/L的PSA废水经该工艺处理,COD去除率达94%。试运行结果表明,其出水水质达到国家排放标准(GB8978-1996)。 相似文献
253.
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
254.
随着农村经济的快速发展,农村环境污染日益严重,生态环境日益恶化,严重制约了农村经济的可持续发展。本文就农村环境污染的现状、环境污染问题分析和解决对策方面进行了探讨。 相似文献
255.
256.
磷化氢液相催化氧化净化催化剂的初筛 总被引:4,自引:0,他引:4
传统的净化方法难以实现低成本、高效、选择性净化低浓度磷化氢尾气,这限制了含磷化氢尾气的资源化技术的实现。通过Pd(Ⅱ)、Fe(Ⅲ)、Cu(Ⅱ)、Pd(Ⅱ)-Cu(Ⅱ)、Pd(Ⅱ)-Fe(Ⅲ)对低浓度磷化氢连续净化的研究,筛选出在低温(<80℃)、常压下对低浓度磷化氢(850mg/m3)具有液相催化氧化净化活性的Pd(Ⅱ)、Pd(Ⅱ)-Cu(Ⅱ)、Pd(Ⅱ)-Fe(Ⅲ)3种催化剂,其中Pd(Ⅱ)催化氧化净化低浓度磷化氢的净化效率>60%,Pd(Ⅱ)-Cu(Ⅱ)及Pd(Ⅱ)-Fe(Ⅲ)催化氧化低浓度磷化氢(850mg/m3)的净化效率可达100%。 相似文献
257.
Yichang Yang Xingang Liu Jun Zheng Qinwen Tan Miao Feng Yu Qu Junling An Nianliang Cheng 《环境科学学报(英文版)》2019,31(5):297-310
A continuous online observation of ozone and its precursors(NOx, VOCs) was carried out in central urban Wuhan from September 2016 to August 2017. The concentration levels of ozone,NOx, VOCs and their variations in urban Wuhan were analyzed, as well as effects of VOCs on ozone photochemical generation and the main controlling factors for ozone production. During the observation period, the average concentrations of ozone and NOx in Wuhan was 22.63 and30.14 ppbv, respectively, and the average concentration of VOCs was 32.61 ppbv(42.3% alkanes,13.0% alkenes, 10.0% aromatics, 7.3% acetylene, 9.9% OVOCs, and 10.5% halohydrocarbons).Ozone concentration was higher in spring and summer as compared with autumn and winter,wheras VOCs and NOx concentratios were lower in spring and summer but higher in autumn and winter. Aromatics and alkenes, two of VOCs species, showed the highest contributions to ozone formation potential in Wuhan(35.7% alkenes, 35.4 aromatics, 17.5% alkanes, 8.6% OVOCs,1.6% halogenated hydrocarbons, and 1.4% acetylene). Among all VOCs species, those with the highest contribution were ethylene, m-xylene, toluene, propylene and o-xylene. The contribution of these five compounds to the total ozone formation potential concentration was 43.90%.Ozone-controlling factors in Wuhan changed within one day; during the early morning hours(6:00–9:00), VOCs/NOx was low, and ozone generation followed a VOCs-limited regime.However, during the peak time of ozone concentration(12:00–16:00), the ratio of VOCs/NOx was relatively high, suggesting that ozone generation followed a NOx-limited regime. 相似文献
258.
厌氧发酵产氢具有很多优越性,发展潜力巨大,具有高效、节能、成本低等优点.全文介绍了国内外发酵产氢的研究情况,厌氧发酵产氢的影响因素,并提出了厌氧发酵产氢的发展趋势. 相似文献
259.
260.