Enhanced adsorptive removal of naphthalene intermediates from aqueous solution by introducing reed straw into sewage sludge-based activated carbon

The disposal of sewage sludge (SS) and reed straw (RS) has becoming a critical issue due to their rapid production. In this study, the SS-based activated carbon (SSC) was produced by introducing the RS as a component material. Properties including BET surface area, pore volume, surface chemical groups, and morphologies were characterized. The adsorption of 1-diazo-2-naphthol-4-sulfonic acid (1,2,4-Acid) and 2-Naphthol (2-Nap), which differs in their physicochemical properties, on as-prepared carbons were investigated. The overall adsorption was found to be jointly controlled by external mass transfer and intraparticle diffusion, and the optimal pH was found to be 5 due to their electrostatic attraction. Further study revealed that the SS- and RS-based carbons (SC and RSC, respectively) exhibited different adsorption behavior toward 1,2,4-Acid and 2-Nap. The calculated adsorption capacity from Langmuir–Freundlich model of SC and RSC for the two intermediates was 141.0, 84.6 mg g^-1 and 48.2, 110.2 mg g^-1, respectively, whereas their hybrid product (SSC) showed comparable capacity for 1,2,4-Acid (117.8 mg g^-1), as well as higher capacity for 2-Nap (157.5 mg g^-1). It was found that the presence of meso- or macropores facilitates the precipitation of mineral phases of inorganic substances during carbonization, attracting the molecules with polar functional groups, while the introduction of C-rich RS to SS enhances the adsorption of hydrophobic molecules.     

反馈控制理论在安全隐患管理中的应用

事故防制是安全管理的核心,而事故隐患是导致事故发生的根源.因此,有效的隐患管理成为安全管理工作的重中之重.将反馈闭环控制机制应用在安全隐患管理的全过程中,收到了良好的效果,提高了隐患管理水平,保证现场安全生产的正常展开.     

公路桥面伸缩装置及其对桥梁静动力性能影响综述∗

桥梁伸缩装置(以下简称伸缩缝)使用环境恶劣、受荷形式复杂,易出现多种病害。伸缩缝病害会造成桥梁耐久性降低,车致桥梁动力响应加重等不利现象。因此,伸缩缝病害机理及其处置方法和考虑伸缩缝参数影响的车-桥耦合动力响应规律研究受到了广泛关注。本文综述了桥梁伸缩缝力学性能,常见病害及其影响,病害机理及其处置方法等的发展现状;重点讨论了考虑伸缩缝参数及其变化影响的桥梁动力响应的研究进展及存在的问题;展望了未来桥梁伸缩缝研究中有待解决的关键问题。     

GC-MS法对垃圾渗滤液生物处理前后微量有机物的研究

运用GC—MS联用技术对吴江市生活垃圾填埋场的渗滤液及生物处理曝气池出水中的微量有机物进行了检测,测得进水主要有机污染物53种,出水主要有机污染物55种。微量有机物总去除率与CODCr去除率相近。     

微生物在环境污染治理中的应用

本文介绍了近年来微生物在气体污染、水污染的处理等方面的应用。     

水相中CCl4和CHCl3的紫外光解机理

利用瞬态吸收光谱技术研究水体污染物CCl₄和CHCl₃在紫外光照条件下的转化和归宿,表明在248nm激光作用下,CCl₄解离为CCl₃和Cl自由基;CHCl₃在此条件下不解离,但加入少量的苯后即发生明显解离,产生CHCl₂和Cl自由基.在有氧条件下,光解产生的CCl₃和CHCl₂自由基均与O₂反应分别生成CCl₃O₂和CHCl₂O₂;在无氧条件下,CCl₃和CHCl₂则发生偶合反应分别生成C₂Cl₆和C₂H₂Cl₄.本研究还得出了一些微观速率常数.     

Research on the anti-interference capability of the tourism environment system for the core stakeholders of semi-arid valley-type cities: analysis based on the multi-scenario and time series diversity perspectives

Environmental Science and Pollution Research - Given the relatively harsh natural environment in semi-arid valley areas, the attraction and radiation functions of semi-arid valley cities have...     

The role of lime in dredged mud dewatered by a plate and frame filter press and potential substitutes

Environmental Science and Pollution Research - Dredged mud is a kind of construction material that can be reused as waste. It needs to be dehydrated before it is used. At present, plate and frame...     

Biodegradation of triazine herbicide metribuzin by the strain Bacillus sp. N1

By enrichment culturing of soil contaminated with metribuzin, a highly efficient metribuzin degrading bacterium, Bacillus sp. N1, was isolated. This strain grows using metribuzin at 5.0% (v/v) as the sole nitrogen source in a liquid medium. Optimal metribuzin degradation occurred at a temperature of 30ºC and at pH 7.0. With an initial concentration of 20 mg L^?1, the degradation rate was 73.5% in 120 h. If the initial concentrations were higher than 50 mg L^?1, the biodegradation rates decreased as the metribuzin concentrations increased. When the concentration was 100 mg L^?1, the degradation rate was only 45%. Degradation followed the pesticide degradation kinetic equation at initial concentrations between 5 mg L^?1 and 50 mg L^?1. When the metribuzin contaminated soil was mixed with strain N1 (with the concentration of metribuzin being 20 mg L^?1 and the inoculation rate of 10¹¹ g^?1 dry soil), the degradation rate of the metribuzin was 66.4% in 30 days, while the degradation rate of metribuzin was only 19.4% in the control soil without the strain N1. These results indicate that the strain N1 can significantly increase the degradation rate of metribuzin in contaminated soil.