Field measurements of dissociation of ammonium nitrate at a Beijing site

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ACF的结构及其滤材特性的研究

根据活性炭纤维与颗粒状活性炭的平行实验，对比了ＡＣＦ与ＧＡＣ的物化特性和基本结构，以说明ＡＣＦ作为新型环境功能材料的特点，在实验室建立的流动法测定材料吸附特性的系统中，对ＡＣＦ在不同流量下对不同上游浓度污染气体（ＮＨ３）的吸附性能进行了测定，获得了ＡＣＦ的穿透曲线，对其吸附性能与吸附床流量和上游浓度进行了相关分析，并对以ＡＣＦ为滤料的空气过滤器的除污性能进行了测试。     

Global warming related carbon dioxide abatement proposals

The relationship between man-made CO2 emission and atmospheric CO2 concentration has been established. The factors that affect CO2 reduction allotment and the impacts on future energy demand and supply were discussed, in order to help energy policy makers both in developed countries and in developing countries for understanding the fundamental constraint on energy sector resulted from global warming related CO2 reduction, and hopefully in finding a common objective starting point to deal with global warming negotiation in energy sector, and to investigate the optimum stabilization goal and process acceptable to all sovereign countries that based on equity and applicability.     

Soil water characteristics in mountain poplar stand and its benefits to soil and water conservation in loess hilly region

ＳｏｉｌｗａｔｅｒｃｈａｒａｃｔｅｒｉｓｔｉｃｓｉｎｍｏｕｎｔａｉｎｐｏｐｌａｒｓｔａｎｄａｎｄｉｔｓｂｅｎｅｆｉｔｓｔｏｓｏｉｌａｎｄｗａｔｅｒｃｏｎｓｅｒｖａｔｉｏｎｉｎｌｏｅｓｓｈｉｌｌｙｒｅｇｉｏｎＷｕＱｉｎｘｉａｏ；ＬｉｕＸｉａｎｇｄｏｎｇ...     

Impacts of climate change on wheat development and production in the northern China

In this paper, impacts of climate change on wheat development rate and production in the northern China are discussed. The results show that the temperature is a controlling factor of development rate but the precipitation is not. The higher the temperature is. the faster the development and the shorter development period will be. Without consideration to varieties and cropping system, meteorological yield of winter wheat would decrease 170.40, 134.25, 98.70 and 97.20 kg/hm2 in the north China and 13.97, 7.95, 39.60 and 19.80 kg/hm2 in the northwest China compared with that in 1950s, 1960s, 1970s and 1980s, respectively, when the CO2 concentration in the atmosphere is doubled. In drought and semi-drought regions, the spring wheat yield would drop with the temperature rise in and raise with the precipitation increase. The influence of temperature on weight of leaf and stalk is also remarkable.     

Petroleum waste biodegradation with porous biomass support system (PBSS) on rotating biological contactor

A laboratory scale study was conducted to assess the feasibility of the new coupling of rotating biological contactor (RBC) plus porous biomass support system (PBSS) using polyurethane foam as porous support media to biodegrade petroleum refinery wastewater. Polyurethane foam was attached on disks of two four-stage laboratory scale cascade connected RBC units.The two RBC units were operated simultaneously at different but constant, flowrates giving hydraulic loading rates of 0.01, 0.02, 0.03, 0.04 m3/m2/d in two runs keeping the same rotational speed 10 r/min throughout. Organic loading was a less controllable factor in this study.For all of the hydraulic loadings, it was found that the removal efficiency of total chemical oxygen demand (TCOD) and oil were above 80 percent. Ammonia nitrogen and phenol removal were above 90 and 80 percent respectively. The maximum biomass concentration within polyurethane foam was about 30 g/m2 in the first stage for 0.03 m3/m2/d hydraulic loading.The results show that t     

Gas chromatographic separation and determination of chloroanthracene isomers on fly ash

An efficient, reproducible and rapid fused silica capillary column gas chromatographic method, in splitless mode, for analysing of the three chloroanthracene isomers is described. The method affords efficient separation and good linearity for each isomer in the range of 0.2 -200 μg/ml. The method can also be used in separation and determination of another thirty three aromatic and their halosubstituted compounds. This paper also presents the applications of the method in analysing of complex products mixture from reaction of the selected aromatic compounds with hydrogen chloride on fly ash surface from municipal incinerator.     

臭氧控制膜污染的研究进展

本文对臭氧在控制膜污染方面的研究现状进行了综述,重点放在臭氧用于膜冲洗和臭氧用于过滤液预处理这两个方面;指明了在一定的条件下,臭氧可以有效地减缓、降低膜污染;臭氧控制膜污染的作用主要通过臭氧降解造成膜污染的有机物质来实现.此外,还介绍了一些臭氧与膜联用的开发应用情况.     

无排泥条件下HRT对膜生物反应器硝化性能的影响及其生物群落结构分析

以无机氨氮废水(NH+4 N,500mg·L-1)为处理对象,在不排泥条件下逐渐缩短膜生物反应器的水力停留时间(HRT,30h～5h),连续运行260d.在反应器内的氨氮容积负荷和污泥负荷分别为1 2kg·(d·L)-1和2 13kg·kg-1·d-1时,氨氮去除率达98 2%以上.当HRT减少至7h时开始出现NH+4 N和NO-2 N的积累.尽管反应器内MLSS随着运行时间的延长在逐步上升,氨氧化菌(AOB)和亚硝酸氧化菌(NOB)的数量分别从HRT10h和15h起开始下降.16SrDNA聚合酶链式反应结合变性梯度凝胶电泳(PCR DGGE)的分析发现反应器内生物多样性随着运行时间的延长而增加,测序结果表明进行氨氧化作用的主要是亚硝化单胞菌属(Nitrosomonassp.),进行亚硝酸氧化的主要是硝化螺菌属(Nitrospirasp.).尽管反应器只进行无机氨氮配水,仍存在大量的异养菌,估计其生长是以胞外分泌产物和细胞裂解产物为基质.     

离子膜电解法降解苯胺硝基苯废水的研究

文章采用离子膜电解法对低浓度苯胺、硝基苯废水进行处理,对影响降解效果的几种因素进行了研究。实验结果表明:在常温,电压为4V,pH值为3时,电解0.5h苯胺去除率可达98.0%,硝基苯去除率为65.3%;4.5h后苯胺去除率可达99.7%,硝基苯去除率可达90.3%,TOC去除率为91.8%。同时,离子交换膜的加入还能去除废水中的盐分,为后续生化处理提供了有利条件。