Removal of bromate ion using powdered activated carbon

Bromate ion (BrO 3) removal from drinking water by powdered activated carbons (PAC S) in bath mode was evaluated under various operational conditions.Six kinds of PACs,including wood-based carbon,fruit-based carbon,coal-based carbon,and these three carbons thermally deoxidized in a nitrogen atmosphere,were selected to investigate their capacity on BrO 3 removal.With the highest zeta potential value and being richly mesoporous,coal-based carbon had a high and an excellent BrO 3 adsorption efficiency.The removal content of BrO 3 by per gram of coal-based carbon was 0.45 mg within 5 hr in 100 μg/L bromate solution.The surface characteristics of PACs and bromide formation revealed that both physical and chemical PACs properties simultaneously affected the adsorptionreduction process.Under acidic conditions,PAC S possessed high zeta value and adequate basic groups and exhibited neutral or positive charges,promoting BrO 3 adsorption-reduction on the carbon surface.Interestingly,the PAC S thermally deoxidized in N 2 atmosphere optimized their properties,e.g.increasing their zeta values and decreasing the oxygen content which accelerated the BrO 3 removal rate.The maximum adsorption capacity of fruit-based carbon was the highest among all tested carbons (99.6 mg/g),possibly due to its highest pore volume.Remarkably,the thermal regeneration of PACs in N 2 atmosphere could completely recover the adsorption capacity of PACs.The kinetic data obtained from carbons was analyzed using pseudo second-order and intraparticle diffusion models,with results showing that the intraparticle diffusion was the more applicable model to describe adsorption of BrO 3 onto PACs.     

芳烃联合装置污染源调查分析及控制治理措施

中国石化洛阳分公司芳烃联合装置始建于1998年,2000年3月建成,主要包括芳烃抽提和对二甲苯2套装置。芳烃抽提装置采用美国UOP环丁砜工艺技术,以炼油装置重整生成油为原料,利用液液萃取的方法,分离出重整油中的芳烃和     

平凉市煤矿瓦斯气象预警系统

利用崇信县气象观测资料,选用华煤集团新柏煤矿瓦斯浓度观测资料,进行多因子分析,探讨气象条件与矿井瓦斯浓度的关系,选取相关系数绝对值大于0.3的因子,用统计学方法中的逐步回归法进行煤矿区不同回风巷瓦斯浓度预测,建立瓦斯气象条件预警模型,并建立瓦斯气象自动监控预警系统平台,为研究煤矿瓦斯爆炸,减少煤矿安全生产事故的发生,提供科学依据。     

Pyrene partition behavior to the NOM: Effect of NOM characteristics and its modification by ozone preoxidation

Hydrophobic organic contaminants (HOCs)—pyrene, and natural organic matters (NOM) from different sources were taken as the test compounds to investigate the impact of physicochemical characteristics of NOM on HOCs’ partition to the NOM in this study. The effects of solution property, NOM characteristics, and modification by ozone preoxidation on pyrene partition to NOM were systematically evaluated. According to the fluorescence quenching method, the partition coefficient K _oc of pyrene to NOM was calculated, which was found to have a great relationship with the aromatic structures and hydrophobic functional groups of the NOM. The NOM characteristic modification corresponding to solution property could influence the interactions between the NOM and pyrene. Preozonation could destroy the aromatic or hydrophobic structures of the NOM and decrease K _oc of pyrene.     

依靠科技进步节能减排,提高钢铁行业发展的内力

节能减排是我国经济发展中必须解决的问题,特别是高耗能产业更应首当其冲。我国钢铁行业节能减排任务很重,但依靠科学技术的进步,提高了企业发展的内力,取得了一定的成绩。但是,钢铁业总能耗依然占到全国总能耗的14%以上,今后面临的节能减排任务仍很艰巨。     

无铅焊料合金中重金属元素浸出行为的研究

选用Sn.3.5Ag-0.5Cu、Sn-3.5Ag、Sn-0.5Cu无铅焊料合金及它们与Cu的钎焊接头,研究了它们在典型的酸性、碱性和盐溶液中的重金属元素的浸出规律.结果表明,焊料合金中的主要浸出元素Sn在酸性或碱性溶液中的浸出量都不是太多,而在NaCl盐溶液中浸出量增大2个数量级.制备成钎焊接头后,在酸性环境中,Sn-3.5Ag和Sn.0.5Cu钎焊接头中Sn的浸出量增加1个数量级以上,而在NaOH碱性环境中.Sn-3.5Ag-0.5Cu钎焊接头中Sn的浸出量相对较高.该结果对电子垃圾填埋环境选择及相关决策提供了参考.     

苯乙烯装置环境风险评价与危害分析

通过对苯乙烯装置所涉及物质的风险识别、生产设施的风险识别,分析出这些风险进入外环境的途径以及对外环境造成的环境影响,并制定简单的环境风险防范措施。     

炼油企业硫化氢危害识别与中毒防治措施

介绍了炼油行业硫化氢中毒的现状,识别了炼油企业硫化氢危害,分析了硫化氢中毒的事故原因,并介绍了三级预防的防治措施。     

高压静电水处理技术的研究现状及其展望

高压静电场水处理技术是近几十年发展起来的、当今水处理领域中的一门高新技术。在此介绍了国内外高压静电场水处理机理和应用研究现状,并对今后高压静电场水处理技术研究提出几点展望。随着对高压静电场水处理机理研究的不断加强和完善。以及对高压静电水处理技术与其它水处理技术的联合水处理工艺研究的突破。高压静电场水处理技术有望成为一种极具应用前景的高效水处理技术。     

曝气生物滤池处理生活污水的试验研究

对升流式二级曝气生物滤池去除COD和NHs—N的效果进行了试验研究,并在各个阶段对比中找出最优的运行工况,从而达到节约能源,降低运行成本的目的。通过试验对水力负荷、有机负荷、气水比等参数的变化对去除COD和NH3-N效果的影响。研究结果表明,在进水水力负荷为1～4m3／m^2·h、有机负荷为4-13kgCOD／ms·d及气水比1：1～3：1的工艺条件下,COD和NH3-N的出水水质均能满足杂用水需要。