基于径流污染控制目标为目的的分流制初期雨水调蓄池容积确定

鉴于初期雨水污染为地表水体的主要污染源之一,以儒乐湖初期雨水调蓄池容积确定为例,采用调蓄池工程措施进行截流,以V类水体标准为径流污染控制目标,在《室外排水设计规范》中控制径流污染的分流制初期雨水调蓄池计算公式的基础上,应用模型法模拟得出控制目标下的初期雨水径流累积深度及调蓄池容积。结果表明,截留径流累积深度为7mm,初期雨水调蓄池容积分别为9 250、5 850m3时,研究区域内能够满足在管网重现期下排水水质达到V类水体标准。研究成果可为初期雨水截流工程实施提供建议及参考。     

Investigations on Emission Characteristics of a Liquid-Fueled Trapped Vortex Combustor

The combustion and emission formation process of liquid fuel in the trapped vortex combustor(TVC) are very complicated. A trapped vortex combustor with replaceable bluff-bodies was designed to investigate these processes. The bluff-body widths varied from 0.021 m to 0.036 m. Experimental tests were carried out. Liquid RP-3 aviation kerosene was used in the tests. Emissions were measured under atmospheric pressure. The combustion process was analyzed theoretically in the viewpoints of relative ev...     

Gaseous Nanocarving‐Mediated Carbon Framework with Spontaneous Metal Assembly for Structure‐Tunable Metal/Carbon Nanofibers

Vapor phase carbon (C)‐reduction‐based syntheses of C nanotubes and graphene, which are highly functional solid C nanomaterials, have received extensive attention in the field of materials science. This study suggests a revolutionary method for precisely controlling the C structures by oxidizing solid C nanomaterials into gaseous products in the opposite manner of the conventional approach. This gaseous nanocarving enables the modulation of inherent metal assembly in metal/C hybrid nanomaterials because of the promoted C oxidation at the metal/C interface, which produces inner pores inside C nanomaterials. This phenomenon is revealed by investigating the aspects of structure formation with selective C oxidation in the metal/C nanofibers, and density functional theory calculation. Interestingly, the tendency of C oxidation and calculated oxygen binding energy at the metal surface plane is coincident with the order Co > Ni > Cu > Pt. The customizable control of the structural factors of metal/C nanomaterials through thermodynamic‐calculation‐derived processing parameters is reported for the first time in this work. This approach can open a new class of gas–solid reaction‐based synthetic routes that dramatically broaden the structure‐design range of metal/C hybrid nanomaterials. It represents an advancement toward overcoming the limitations of intrinsic activities in various applications.     

Combustion analysis of the diesel–biogas dual fuel direct injection diesel engine – the gas diesel engine

In this investigation, biogas (BG) was used as an alternative fuel in a single-cylinder, four-stroke, air-cooled, direct injection (DI) diesel engine that was operated on a dual fuel mode. Biogas was produced from a non-edible seed de-oiled cake-pongamia pinnata (Karanja), which was collected from the biodiesel industries. The BG was inducted along with the air in suction of the engine at four different flow rates varying from 0.3?kg/h to 1.2?kg/h in steps of 0.3?kg/h. The investigation results revealed that BG inducted at a flow rate of 0.9?kg/h gives better combustion characteristics of engine behaviour than those of other flows throughout the engine operation. The ignition delay (ID) and combustion duration of the engine run by dual fuel operation at a BG flow rate of 0.9?kg/h were found to be longer by about 2 °CA and 2.9 °CA, respectively, in comparison with diesel at full load. The cylinder peak pressure was found to be overall higher by about 11?bar than that of diesel at full load.     

电镀企业清洁生产审核的几点体会

通过参加电镀企业清洁生产审核工作,对撰写电镀清洁生产报告出现的问题进行分析和归纳。强调指出,应执行最新版本的国家标准和法规,使用物料平衡图正确计算资源综合利用指标,利用实例解析所得税的税率对项目经济评估结论的影响,注意数据间的连带关系。     

Mn(Ⅱ)对好氧颗粒污泥微生物活性的影响

针对城市污水中重金属离子短期超标影响污水生物处理系统正常运行的问题,采用好氧颗粒污泥SBR反应器,研究了不同浓度Mn(Ⅱ)短期冲击下对好氧颗粒污泥污染物去除性能、外观结构和微生物活性的影响。试验结果表明,好氧颗粒污泥受不同浓度Mn(Ⅱ)10 d的冲击后,COD去除率受Mn(Ⅱ)影响较小,Mn(Ⅱ)会轻微促进AGS对TN的去除。Mn(Ⅱ)分别为0.5、1.0、3.0 mg/L可提高好氧颗粒污泥的活性,在相应浓度的冲击下SOUR分别提高16.0%、108.5%、51.8%,TTC-ETS分别提高了7.7%、112.4%、45.7%。5.0 mg/L Mn(Ⅱ)对SOUR和TTC-ETS的抑制率分别为13.8%和33.5%。     

一维煤粉燃烧炉内氮释放特性试验研究

主要对煤粉燃烧过程中氮的析出特性进行了研究，并探讨了煤质特性、结构参数和运行参数对氮析出特性的影响，在试验研究的基础上得出了煤粉燃烧过程中氮污染物的析出规律．结果表明，随煤化程度的加深，生成NO的浓度降低；煤阶与氮含量变化不明显；随氮含量的增加．NO浓度升高，氮的转化率降低；细煤粉粒度、低过量空气系数、湿煤粉以及烟气中较高的CO含量均使氮析出量降低．     

脱硫除雾器对烟尘排放影响的研究

除雾器出口雾滴含固量影响烟尘排放达标值,本文通过对实验数据的分析,得出雾滴含固量约7.5%的结论,改变了国内业界一直认为除雾器出口雾滴含固量等同于塔内石膏含固量的观点。本文还针对国内外雾滴测量标准存在差异易引起误解的问题,对两种测量标准进行了对比,得出国标收集称重法测量值较VDI3679撞击法测量值约高10-20 mg/Nm3左右的结论。     

浅谈室内有机化学污染物检测中的几个问题

通过室内有机化学污染物的检测实践,对<民用建筑工程室内环境污染控制规范>GB50325-2001(2006版)以及部分装饰装修材料检测规范在实际应用中存在的一些问题,分别从室内空气污染季节性变化、室内空气质量评价、结果判定以及板材和木制家具检测方法等方面予以讨论,并提出了自己的看法.     

污染土壤/底泥电动修复研究进展

修复污染土壤/底泥对改善生态环境质量极为重要,通过对污染土壤/底泥施加电场,可使污染物定向迁移、富集并去除.综述了电动修复的发展历程,比较了重金属、有机污染物及复合污染物的电动修复机理及其限制因素,分析了土壤预处理(加入酸、氧化剂、共溶剂、表面活性剂,搅拌,升温等)、电极优化(交换电极、阳极逼近、电极矩阵等)、多技术(...