AZ31镁合金高固体组分聚氨酯复合涂层的耐蚀性能

为了在镁合金表面获得高效的复合防护涂层,采用高固体组分增强有机涂层的方法,对AZ31镁合金阳极氧化处理后电泳沉积聚氨酯,然后分别加压包覆刚玉粉、铝粉、锌粉,获得了3种高固体组分的聚氨酯复合涂层。采用SEM、极化曲线、交流阻抗和盐雾试验对复合涂层的结构及性能进行了研究。结果表明:3种粉体可牢固镶嵌于聚氨酯中,形成与基体结合良好、结构致密的复合涂层;施加高组分刚玉粉、铝粉的聚氨酯复合涂层具有优异的抗腐蚀性能,耐盐雾腐蚀在2 000 h以上,而施加高组分锌粉的聚氨酯复合涂层的耐腐蚀性能则相对较差。

γ-射线辐照法改善城市污水厂剩余污泥厌氧消化特性的研究

采用γ-射线辐照法对城市污水厂剩余污泥进行预处理，从固体组分、可溶性组分及厌氧产气量等角度来探讨γ-射线辐照法改善城市污水厂剩余污泥厌氧消化特性的可行性。结果表明，经γ-射线辐照处理后，污泥的平均粒径减小，在辐照剂量为6．51-30．75kGy范围内，粒径的减小率达30％-50％；可溶性有机组分随着辐照剂量升高而增加，当辐照剂量为19．4kGy时，SCOD增加率达552．5％；与未辐照相比，污泥经2．48、6．51、11．24kGy辐照处理后，厌氧消化累计产气量分别增加8．89％、19．74％和35．81％。γ-射线辐照法是一种有效的改善污泥厌氧消化特性的方法，11．24kGy左右的剂量可作为污泥预处理的最佳剂量。

西藏甲玛铜矿全尾砂膏体充填料浆流变特性研究

西藏甲玛铜矿膏体充填料浆输送流量大,要求充填料浆具有良好的输送性能。通过对甲玛铜矿尾砂物化性质的研究以及对膏体充填料浆流变性能的测定,揭示了灰砂比、粉煤灰添加量、质量浓度3个因素对料浆流变性能的影响。得出实验结论:尾砂的密度为2.43 t/m3、松散容重为16.24 k N/m3、密实容重为19.43 k N/m3;尾砂粒度级配良好、化学性质稳定、沉降特性良好。在灰砂比、粉煤灰添加量、质量浓度3因素中,质量浓度为影响膏体充填料浆流变性能的主要因素。膏体充填料浆的屈服应力和黏度随质量浓度的增加而急剧上升,随灰砂比的增加而缓慢上升,受粉煤灰添加量的影响较小。

影响污水生物脱氮能力的关键水质参数及空间分布特征研究

基于住建部城镇污水处理数据管理系统的水质数据，选定影响污水生物脱氮能力的关键水质参数BOD5／TN和SS／BOD5，分析城镇污水处理厂进水水质参数的空间分布特征及参数值，结果表明：我国70％城镇污水处理厂进水BOD5／TN低于4，59％城镇污水处理厂进水SS／BOI）5高于1．2，南部城市较北部城市碳氮比低，悬浮固体比例高，北京、上海、广州20万m3／d污水处理厂进水SS／BOD5维持在1．1～1．2的正常值。我国城镇污水碳氮比（BOD5／TN）偏低、进水悬浮固体无机组分含量偏高（SS／BOD5）的状况普遍存在，构成我国城镇污水的特有水质特性，在城市建设及污水管网尚不完善的区域，这种状况还会继续存在较长的时间，需要加以关注和解决。

复合团聚颗粒的制备及在推进剂中的应用研究进展

综述了国内外用于固体推进剂中的固体粒子的团聚技术研究进展,介绍了复合团聚颗粒的制备和应用效果,认为采用复合团聚颗粒为改善固体推进剂工艺性能、燃烧性能、喷射效率、温度敏感性的研究开辟了新途径,对复合团聚粒子技术的研究与发展提出了建议。

Alternative Use of a Compressed Component of a Digestate from Agricultural BGSs （Biogas Stations）

The paper presents the results of a two-year research of properties and the way of use of briquettes and pellets made of separated and partially dehydrated digestate from agricultural BGSs （biogas stations）. Digestate is a by-product of BGS. There are approximately 170 agricultural BGSs operating in the Czech Republic. Unprocessed digestate with the dry mass content around 6% is usually applied to soil as a lighter mineral fertilizer. If digestate is separated and the separated solid component of the digestate is further dehydrated to 14 % moisture, it can be processed by pressing to the form of very solid pellets and briquettes, also with various additives. It was also ascertained that mechanical strength and shape of briquettes does not change due to long-term storage. In this form, the compressed digestate can be used in various ways. One of the ways is its energetic use by direct burning. That is why we have observed its calorific value and combustion heat. Another alternative use of compressed digestate from BGS is its application in targeted treatment of in particular mechanical properties of soil and its water regime. The briquettes and pellets have great water sorption properties--the briquette retains water and as a consequence grows up to four times in size. This specific property was analysed and it was ascertained that the speed of water sorption depends on the composition of the compressed mixture （i.e., the type of material and the size of its particles）, but also on the total weight of the produced briquettes （i.e., their size）. Similar dependency was ascertained for other briquette materials that were analysed.

Solid Waste Generation and Composition in Mexico： A Comparison between Rural and Urban Communities

This paper reports a generation and composition analysis of household solid waste in Mexico, using as a reference the characterization study performed in two communities, one urban and one rural. Data obtained are fundamental parameters for the planning of urban solid waste management systems in Mexico, complying this way with the established policy in the National Program for Waste Management and Prevention 2009-2012. The study was carried out during five days and two main parameters were assessed： （1） the daily generation rate per person and （2） the waste composition. The per capita waste generation was 0.958 kg for the urban community and 0.631 kg for the rural. The results showed that the mean composition of waste from both locations was statistically similar （a = 0.05）. In both locations the most important contribution was the fraction of food waste. In both locations more than 60% of the waste is potentially recyclable. The results of this study will be used by the municipal waste authorities in order to establish an integrated waste management plan.

An efficient synthesis of polysubstituted tetrahydropyrimidines using acidic Al_2O_3 as solid media

A series of polysubstituted tetrahydropyrimidines were synthesized in moderate to good yields via a one-pot, four-component reaction of an alkyne, formaldehyde, and amines in solid media acidic Al2O3. The advantages of this protocol include mild reaction conditions, broad substrate scope, and environmentally friendly reaction media.