水中硼测定方法比对研究

对姜黄素分光光度法、甲亚胺-H分光光度法和电感耦合等离子体-质谱法测定硼的方法性能进行了比对研究,为硼的测定方法的选择提供了良好的科学依据。     

密闭电石炉尾气利用新途径

密闭电石炉尾气具有成分复杂、净化难、热值较高等特点。现有的利用方法存在可选择的成熟技术少、限制条件多等问题。以年产6万吨电石的电石厂为例，进行了技术经济分析，提出了具有分布式能源特征的密闭电石炉尾气利用途径。     

烧结板除尘器在PVC生产中的应用

介绍了烧结板除尘器在电石法PVC生产中的应用；简述了烧结板除尘器的工作原理和特点；通过结合烧结板除尘器在矿石生产线上的应用情况，验证了烧结板除尘器在电石法PVC等行业除尘应用中的优异除尘效率。     

GROUNDWATER QUALITY IN THE CORTARO AREA NORTHWEST OF TUCSON,ARIZONA1

ABSTRACT The Cortaro Area is currently the depository for much of the liquid waste from the City of Tucson. In the past, more than one-half of the sewage effluent was used for crop irrigation. However, since 1970 virtually all of the sewage effluent has been percolated in the normally dry Santa Cruz River channel. Nitrate and chloride contents were monitored monthly in water samples from about 20 large-capacity irrigation wells. Contents and seasonal trends for these constituents were closely related to the disposal of sewage effluent. Water quality problems other than nitrate include total dissolved solids, boron, coliform, and lead. High lead contents in the area appear to be a natural phenomenon and the coliform contents are likely related to poor well construction. The other quality problems are primarily due to sewage effluent.     

Resources consumption and wastes emission analysis for two manufacture processes of siliconit

Silicon carbide (SiC) heating elements (siliconits) are widely used at high-temperature fields. The raw materials, manufacture process and application fields of siliconits are all related to heavy energy consumption and pollutions, and bring high environmental loads. The resources consumption and pollution emissions in siliconit manufacture process were quantificationally estimated by input/output method. Difference between two traditional techniques to produce siliconits in China was also compared and analyzed. The results show that siliconit manufacture processes consume large quantities of resources because the furnace is open to environment and too much thermal-protection materials are used. For the thick-end technique is more complicated and the thick-end siliconits have a bigger size and mass, there are more resources and energy consumptions and pollution emissions for thick-end process than that for equal-diameter process. Some suggestions were introduced to improve the traditional techniques and a new process was designed. It is the most important that the open furnace should be replaced by close vacuum furnace. Sintering and siliconizing process can be combined into one high-temperature process. As results of process simplification and vacuum sintering, resources and energy consumption and wastes emission can be decreased remarkably.     

Nitrate leaching from a free-draining volcanic soil irrigated with municipal sewage effluent in New Zealand

Land application of municipal sewage effluent is becoming increasingly popular worldwide as a means of disposal, treatment, nutrient recycling, irrigation to meet plants' water requirements, and groundwater recharge. Nitrate leaching from a volcanic soil (Typic Udivitrand) was investigated under a Pinus radiata plantation near Rotorua, New Zealand, which had received, on average, 0, 29, and 88 mm per week of tertiary-treated municipal sewage effluent for the previous 4 years. Four replicates of undisturbed soil monolith lysimeters (200 mm diameter×200 mm depth) from surface soil from each treatment were used to study the influence of the three different rates of effluent application on N leaching. A rapid emergence of nitrate–N occurred in the drainage samples, and indicated that approximately up to half of soil nitrate was readily leached beyond the topsoil. Nitrate–N concentrations in the drainage water increased substantially with effluent application rate, almost reaching the World Health Organisation recommended limits (approximately 10 g m⁻³) in plots receiving effluent at the highest rate. Given that nitrate leaching from the soils may threaten the viability of the land treatment system, due to large N loads being observed in streams which drain irrigated catchments during winter periods, possible strategies for minimising nitrate leaching losses under effluent irrigation may need to be considered.     

SiC工业生产中的环境问题及其防治对策

分析了ＳｉＣ材料工业生产中突出的环境问题及其产生过程和原因，总结了相应的防治对策，并结合当前研究提出了综合治理的新设想。     

硼铁合金烟气净化喷淋塔气液两相流数值模拟

基于计算流体力学(CFD)技术,采用fluent软件平台,针对某硼铁合金厂烟气处理系统中现有设计参数及操作条件下喷淋塔内部流场进行了三维数值模拟分析,对有无喷淋条件下的烟气流场分布进行了对比,另外还分析了喷淋压力,烟气进口速度,以及液滴分布对气液流场分布的影响。较高的喷淋压力和较低的烟气速度有利于气液两相间的传质,液滴的分布也影响着气液两相的传质效率。     

电石渣处理洗煤废水影响因素研究

试验研究了电石渣投加方式、聚丙烯酰胺种类以及加药顺序对洗煤废水处理效果的影响。研究结果表明,电石渣与聚丙烯酰胺的投加顺序对处理效果有显著影响,而且是先投聚丙烯酰胺的效果明显好于先投电石渣;电石渣的投加方式和聚丙烯酰胺的种类对处理效果也有不同程度的影响。     

含硼聚硅酸硫酸铁锌复合絮凝剂的制备及性能

制备了含硼聚硅酸硫酸铁锌复合絮凝剂(PSFZB),研究了硅酸钠溶液浓度、硅酸聚合时间、Fe/Si、Zn/Si、B/Si等因素对絮凝效果的影响,通过正交试验确定最佳制备工艺条件。试验结果表明,研制的PSFZB絮凝剂具有很好的稳定性和较佳的处理效果,适用的pH范围广,是一种较PAC、PFC优良的絮凝剂。