Regulated emission characteristics of in-use LNG and diesel semi-trailer towing vehicles under real driving conditions using PEMS

On-road driving emissions of six liquefied natural gas(LNG) and diesel semi-trailer towing vehicles(STTVs) which met China Emission Standard IV and V were tested using Portable Emission Measurement System(PEMS) in northern China.Emission characteristics of these vehicles under real driving conditions were analyzed and proved that on-road emissions of heavy-duty vehicles(HDVs) were underestimated in the past.There were large differences among LNG and diesel vehicles, which also existed between China V vehicles and China IV vehicles.Emission factors showed the highest level under real driving conditions, which probably be caused by frequent acceleration, deceleration, and start-stop.NOx emission factors ranged from 2.855 to 20.939 g/km based on distance-traveled and 6.719–90.557 g/kg based on fuel consumption during whole tests, which were much higher than previous researches on chassis dynamometer.It was inferred from tests that the fuel consumption rate of the test vehicles had a strong correlation with NOx emission, and the exhaust temperature also affected the efficiency of Selected Catalytic Reduction(SCR) aftertreatment system, thus changing the NOx emission greatly.THC emission factors of LNG vehicles were 2.012–10.636 g/km, which were much higher than that of diesel vehicles(0.029–0.185 g/km).Unburned CH_4 may be an important reason for this phenomenon.Further on-road emission tests, especially CH_4 emission test should be carried out in subsequent research.In addition, the Particulate Number(PN) emission factors of diesel vehicles were at a very high level during whole tests, and Diesel Particulate Filter(DPF)should be installed to reduce PN emission.     

奎屯市区城市废水排污系统网络化的探讨

根据奎屯市区城市废水的排放量大、排污口多、污染物浓度高以及排污下水管道污水处理设施的建成现状等特点，提出了以污水处理厂为治理中心，市区排污管道网络化的改造设想、存在问题及对策。     

稀土酞菁锰对表面活性剂(LAS)的催化氧化性能研究

研究了一种新型含稀土酞菁锰(KCeO2MnPcX)催化剂对水中表面活性剂直链烷基苯磺酸钠(LAS)氧化降解的催化性能,讨论了影响催化氧化反应的各种因素,并确定了最佳反应条件。同时初步探讨了这种催化剂对表面活性剂的催化氧化机理,为处理表面活性剂废水提供了新的途径。     

高级氧化技术机理及在水处理中的应用进展

综述了近年来发展迅速的高级氧化技术，主要包括Fenton法、臭氧氧化法、湿式氧化技术、超临界水氧化法、纳米光催化氧化法电化学催化降解法及超声降解法等。介绍了各种高级氧化技术的基本原理及在废水处理中的应用进展，并对其特点进行了评述。     

高级氧化技术在有机废水处理中的研究与应用

高级氧化技术在有机废水处理领域的研究近年来异常活跃。文章介绍了UV/O3、H2O2/O3、UV/H2O2/O3、US/O3等几种典型的高级氧化技术,阐述了各种高级氧化技术降解有机废水的机理、工艺流程以及在水处理中的应用进展。分析并指出了高级氧化技术研究的热点及今后的主要发展方向。     

氧化沟在炼油污水处理中应注意的几个问题

通过对氧化沟工艺处理炼油污水效果的分析，提出影响处理效果的各种因素，并探讨对策及建议。     

江宁开发区污水处理厂二期调试运行

江宁开发区污水处理厂建设规模为4万m^3／d，分两期建成，采用氧化沟处理工艺，污泥处理采用不经消化的带式脱水工艺。在此主要叙述了各工艺构筑物的设备配置、功能、设计参数及二期工程的试运行情况。     

海水烟气脱硫初探

分析了金山卫，定海，北仑港和台州等地的海水成份，测定了它们的缓冲能力，在鼓泡反应器中进行了海水吸收ＳＯ２的静态试验和使吸收液中ＳＯ３＾２－转变为ＳＯ４＾２－的氧化试验，试验结果表明海水具有用作烟气脱硫吸收液的可能性和吸收液经曝气后直接排海的可能性。     

无剩余污泥接触氧化法处理漂染废水的探讨

对漂染废水的处理，虽能做到达标排放，但其剩余污泥的生成量也过多，该文以上海信泰纺织品有限公司无剩余污泥接触氧化法处理漂染废水的实例，表明了既可提高污染物去除率，又能节省投资和运转费用，通过两年的运行实践，证明效果良好，在对酸化反应器的设计和有效控制方面，以及氧化反应器与酸化反应器的运行管理等方面也进行了探讨。     

超声降解水中污染物技术浅述

介绍了超声降解水中污染物的机理、影响因素和几种典型的超声联用技术。并指出超声技术在今后水处理应用领域的研究方向。