对安全生产标准化建设的探讨

从安全生产标准化建设的内容、制定方法、体系及效果,结合实际经验进行了探讨.安全生产标准化建设的实施为职工创造了一个安全舒适的工作环境,制约了生产过程中的不安全因素,避免了因环境因素引起的违章作业,是传统安全管理迈向科学安全管理的必由之路.     

攀钢烧结机头烟气脱硫技术方案的建议

主要介绍了攀钢烧结机头烟气现状 ,并分析了该烟气中硫元素的主要来源 ;目前国内部分已运用于生产和正处于研究、开发阶段的大烟气量低浓度 SO2 脱硫技术 ;日本新日铁株式会社已运用于生产的利用活性炭吸附的烧结烟气脱硫、脱硝技术。并对攀钢进行烧结烟气脱硫提出了一些建议。     

气流噪声治理及设计

本文根据气流噪声的频率特性和发声部位,提出重点降噪与综合整治的方法,对城市气流噪声污染进行控制。     

聚硅酸锌絮凝剂的电镜特征和絮凝效果

利用透射电子显微镜（TEM）和扫描电子显微镜（SEM）观察了聚硅酸锌（PSAZ）絮凝剂的凝胶颗粒结构,考察了不同浓度的锌离子与二氧化硅含是以及不同阴离子组成对聚硅酸锌絮凝胶结构的影响,对比了锌离子和铝离子形成聚硅酸盐絮凝剂的结构特征。同时比较了聚硅酸锌絮凝剂和铝系列絮凝剂的絮凝效果。     

南亚热带丘陵土壤水分循环及其有效性的研究──Ⅲ.降雨入渗与地表径流

南亚热带高温多雨,年降雨量大而分布不均,台风雨季节降雨强度大,全年降雨多集中在4～9月,占全年的80％以上,因而大大地增加了降雨所引起的地表径流,径流也主要集中在多雨季节,特别是在5～8月,占全年降雨径流量的90％左右,形成了南亚热带坡地独特的地表径流特征．南亚热带的降雨入渗对表土层的影响较大,在暴雨过程中,0～30cm土层水分易产生饱和,因而易产生地表径流,从而减少水分入渗．这对作物生长产生不利的影响．     

交联壳聚糖乙酸酯冠醚对金属离子的吸附性能研究

本文合成了二苯并-16-冠-5-氯代乙酸酯冠醚和3,5-二叔丁基-二苯并-14-冠-4-双氯代乙酸酯冠醚,然后分别将之与交联壳聚糖(简称CCTS)反应,制备了交联壳聚糖二苯并-16-冠-5-乙酸酯冠醚(简称CCTS-1)和交联壳聚糖3,5-二叔丁基-二苯并-14-冠-4-双乙酸酯冠醚(简称CCTS-2),并研究了它们对Pb~(2+),Cu~(2+),Cr~(3+),Ni~(2+),Cd~(2+)的吸附性能。结果表明:这两种吸附剂对pb~(2+),Cu~(2+)有较高的吸附选择性。     

Rare earth elements tracing the soil erosion processes on slope surface under natural rainfall

A field experiment using rare earth elements (REEs) as tracers was conducted to investigate soil erosion processes on slope surfaces during rainfall events. A plot of 10 m × 2 m × 0.16 m with a gradient of 20° (36.4%) was established and the plot was divided into two layers and four segments. Various REE tracers were applied to the different layers and segments to determine sediment dynamics under natural rainfall. Results indicated that sheet erosion accounted for more than 90% of total erosion when the rainfall amount and density was not large enough to generate concentrated flows. Sediment source changed in different sections on the slope surface, and the primary sediment source area tended to move upslope as erosion progressed. In rill erosion, sediment discharge mainly originated from the toe-slope and moved upwards as erosion intensified. The results obtained from this study suggest that multi-REE tracer technique is valuable in understanding the erosion processes and determining sediment sources.     

二级活性炭生物流化床深度处理有机胺废水研究

采用二级活性炭生物流化床工艺深度处理有机胺废水,研究了有机容积负荷、NH3-N容积负荷以及曝气间歇对COD、NH3-N去除效果的影响.结果表明:当有机容积负荷为0.94～2.38 kg COD/(m3·d)时,二级流化床对COD的去除率为80.6%～95.5%,比一级流化床的抗有机负荷冲击的能力更强;当NH3-N容积负...     

共存杂质对磷酸铵镁结晶法回收磷的影响研究

研究用磷酸铵镁（MAP）结晶法去除、回收废水中的磷,分析含磷废水中各类共存杂质对MAP法去除、回收磷的影响。结果表明,废水中无机钙离子的存在可提高磷的去除率,而大分子有机物杂质的存在会使磷的去除率显著降低,小分子有机物对磷的去除基本无影响。在反应体系中引入外来晶种烟煤、石英砂和铁屑可显著提高低浓度含磷废水磷的去除效率,其中娴煤作为晶种的效果最明显。     

Levels of PCDD/Fs and DL-PCBs in selected foods and estimated dietary intake for the local residents of Luqiao and Yuhang in Zhejiang, China

Polychlorinated dibenzo-p-dioxins/furans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (DL-PCBs) were measured by high resolution gas chromatograph/high resolution mass spectrometer (HRGC/HRMS) in six food groups from Luqiao (LQ) where the e-waste has been recycled and from Yuhang (YH) where the agriculture dominates in Zhejiang Province in China. The total WHO-TEQ values of PCDD/Fs and DL-PCBs in selected foods from LQ were significantly much higher than those from YH. The highest level of the total WHO-TEQ was in crucian carp (10.87 pg g(-1) w.w.) followed by duck (3.77 pg g(-1) w.w.), hen eggs (2.80 pg g(-1) w.w.), chicken (2.43 pg g(-1) w.w.), rice (0.08 pg g(-1) w.w.) and vegetables (0.022 pg g(-1) w.w.) in LQ. By contrast, the highest levels were measured in duck (0.74 pg g(-1) w.w.) followed by hen eggs (0.69 pg g(-1) w.w.), crucian carp (0.55 pg g(-1) w.w.), chicken (0.44 pg g(-1) w.w.), vegetables (0.002 pg g(-1) w.w.) and rice (0.0002 pg g(-1) w.w.) in YH, respectively. The monthly intake of PCDD/Fs and DL-PCBs for the local residents was 401.75 pg WHO-TEQ g(-1) w.w. in LQ, which is above the provisional tolerable monthly intake (PTMI) set by the Joint FAO/WHO Expert Committee on Food Additives (JECFA). We determined a monthly intake of 37.13 pg WHO-TEQ g(-1)w.w. in YH, which is below the PTMI. Crucian carp was the predominant contributor to the estimated monthly intake (EMI), accounting for 67.74% and 36.51% in LQ and YH, respectively. High levels of PCDD/Fs and DL-PCBs in selected foods indicate severe contamination of these pollutants in the e-waste recycling site.