La掺杂TiO2/有机改性膨润土对TNT弹药废水的光催化降解性能研究

利用超声强化溶胶-凝胶法制备了La掺杂TiO2/有机改性膨润土复合光催化材料并进行了结构表征;以弹药废水中主要污染物质TNT作为目标物,考察了影响光催化降解性能的因素.结果表明：有机改性后复合材料的吸附性能和光催化性能均有所增加,对TNT的60min的吸附去除率和光催化降解率分别达到9.68％和94.53％;影响TNT光催化降解率的因素有光照时间、催化剂用量、TNT初始浓度、溶液pH值和光照强度.     

污水处理厂微孔曝气器选型的探讨

曝气器是污水处理厂的核心设备。目前广泛运用的鼓风机微孔曝气是一种高效节能的曝气方式。选择适当的微孔曝气器是非常重要的,不仅保障污水处理效果稳定,运行成本较低,还能节省设备投资和维护费用。结合微孔曝气器在污水处理厂的运用效果,分析了各种微孔曝气器的性能、特点和优劣,并对污水处理厂微孔曝气器的选型进行了探讨。     

改性硅藻土陶瓷生物膜载体的制备及性能研究

主要对硅藻土的烧结改性进行了进一步的研究,并对改性硅藻土用于污水处理系统生物膜的载体制作进行参数研究。通过设置适宜的污水水力学特性、良好的载体挂膜性能表征、实验运行稳定性等多方面进行对比实验,得出最佳生物膜挂膜性能的改性硅藻土陶瓷生物膜载体。     

温拌阻燃沥青混合料阻燃效果评价

通过氧指数、质量损失率及路用性能试验,研究EC130温拌剂、FRMAX型阻燃剂对沥青混合料阻燃效果的影响。试验结果显示,相比普通沥青混合料,阻燃沥青混合料、温拌阻燃沥青混合料氧指数分别增加23.3%、25.6%,质量损失率减小28.0%、32.0%,残留动稳定度增加14.0%、16.1%,残留最大弯拉应变增加14.1%、17.1%,冻融劈裂强度比增加5.3%、9.0%。相比普通沥青路面,阻燃沥青路面、温拌阻燃沥青路面发生火灾时能够减少34.0%、41.1%的毒害气体生成,并减少路面修补所需的混合料质量。其次得出普通沥青路面、阻燃沥青路面及温拌阻燃沥青路面的质量损失率、残留动稳定度、残留最大弯拉应变、残留冻融劈裂强度比与燃烧时间的关系模型。结果表明:阻燃剂对沥青混合料的阻燃效果显著;温拌剂有助于阻燃剂更好地发挥阻燃作用,降低火灾对道路的破坏,降低隧道火灾发生时有害气体的生成,提升隧道安全性。     

羧化CTS微球对共存有机污染物的吸附研究

采用反相悬浮法制备交联羧甲基化壳聚糖微球,并用高效液相色谱法-紫外检测研究了改性壳聚糖微球对共存有机污染物的吸附。试验了吸附时间、溶液pH值、有机物的浓度等因素对水中共存有机污染物吸附的影响。结果表明,在有机物浓度相近的情况下,羧化改性壳聚糖微球对水中2,4-二硝基酚的去除量最大。     

Experimental analysis of thermal performance of evacuated tube and flat-plate solar air collectors at different air flow rates

The thermal performances of an evacuated tube collector (ETC) and flat-plate solar air collector (FPC) are experimentally investigated at different air flow rates. To investigate the performance of the ETC and FPC, experimental set-ups were fabricated. Air was used as a working fluid and tested at the same climatic conditions. The ETC had 15 evacuated tubes with a surface area of 1.66 m². The experimental set-up consisted of a header with a hollow pipe (square pipe) in the centre through which the air flowed. The flat-plate collector had a surface area of 1.35 m². The FPC had a black painted absorber sheet which divides the collector into two sections. The air flowed through the upper and the lower sections parallel to the collector to minimize the overall heat loss. The temperature of the outlet air depends on several factors along with the airflow rate and the intensity of the solar radiation. It was found that during the day at high flow rates, the efficiency of the ETC varies from 0.12 to 0.5, and for the flat plate it was from 0.29 to 0.68. The maximum temperature of the air was 56.7°C for the ETC and 25.7°C for the FPC.     

Sustainability assessment of EPS-geofoam in road construction: a case study

ABSTRACT

In the present study, construction procedure and performance assessment of expanded polystyrene EPS-geofoam layer, which is utilized in the repair and rehabilitation of road work, is demonstrated. EPS geo-foam application was suggested after observing excessive settlement and distress of approach roads near Cross drainage (C-D) works constructed on bypass road of an important National Highway Project in India. EPS-geofoam was used as an alternative to earth backfill in approaches of newly constructed culvert on the same bypass road on one side of the C-D work and, for comparison purpose; the other side of the C-D work was retained with existing earth backfill. EPS-Geofoam was convenient to handle, easy to place and executed effeciently in terms of machineries and man power. Also, after 6 months of observation, it was noted that Pavement Quality Concrete (PQC) constructed over earthfill material have shown sign of distress and longitudinal cracks were observed due to excessive settlement; on the other hand PQC constructed over EPS-geofoam was intact with no sign of distress. Outcome of the study suggest the use of EPS-geofoam in similar situations as per the proposed guidelines for construction as well as cross-sectional details and design recommended.     

The effect of environmental regulation on firms' competitive performance: the case of the building & construction sector in some EU regions

There is a considerable debate on the effects of environmental regulation on competitive performance. Based on survey data, this paper analyzesthe two main research questions, derived from literature, on the links between environmental regulation and competitiveness, by focusing on firms operating in the building and construction sector, i.e.: 1) whether environmental policy stringency affects the competitive performance of firms in the building and construction sector 2) and how a specific form of environmental regulation (direct regulation, economic instruments and soft instruments) affects this performance? By applying a regression analysis, we find that a more stringent environmental regulation, measured by inspection frequency, provides a positive impulse for increasing investments in advanced technological equipment and innovative products and on business performance. Moreover, a well-designed “direct regulation” appears to be the most effective policy instrument for prompting the positive impact of environmental policies on innovation and intangible performance while economic instruments do negatively affect business performance.     

噻唑类缓蚀剂QADT的合成及缓蚀性能研究＊

以正丙醇、氯气和硫脲合成了2-氨基-5-甲基噻唑,将上述产物作为碱组分,与苯甲醛和苯乙酮反应得到曼尼希碱,最后采用溴代十二烷作为季铵化试剂,制得目标产物溴代2-氨基(1,4-二苯基-3-氧代丁基)-5-甲基噻唑铵(QADT)。静态失重法表明,QADT缓蚀效果显著。当温度为50℃,QADT的用量在200 mg/L时,缓蚀率达到95%以上。     

城市土地储备制度绩效评价研究——以武汉市为例

城市土地储备制度绩效评价对保障土地储备制度健康发展有重要意义.在对城市土地储备制度绩效评价内涵界定的基础上,构建绩效评价指标体系,运用层次分析法和综合指数法.以武汉市为例,对城市土地储备制度绩效进行评价研究.结果表明,武汉市城市土地储备制度绩效评价综合得分为78.89,取得了良好制度绩效.其中,城市经济发展和土地利用配置效益明显提高,综合指数分别为80.50和83.16,而公平配置效益得分较低,为70.18.依据评价结果,提出了兼顾"效益"和"公平"的政策建议.