Optimization for MSW logistics of new Xicheng and new Dongcheng districts in Beijing based on maximum capacity of transfer stations

The new Xicheng and new Dongcheng districts of Beijing in 2010 were chosen as the research object. Based on the analysis of the current municipal solid waste (MSW) logistics system, the transfer station’s processing capacity and the terminal treatment facilities' conditions of the two new districts and other districts, a MSW logistics system was built using geographic information system (GIS) and analytic network process methods considering transregional treatment. The new logistics (MSW from new Xicheng was collected for Majialou. MSW from old Dongcheng and Xuanwu was collected for Datun and Xiaowuji, respectively) proved to be an improvement with a 10 % less collection fee, 111 % output–input ratio after transfer station (include) and 0.8:4.6:4.6 I:C:L (incineration:compost:landfill). After Nangong, Gaoantun II and Asuwei incineration are established, the output–input ratio of the new logistics will reach 114 %, and I:C:L will reach 3.6:4.2:2.2 which is environmentally friendly and nearer to the 4:3:3 Beijing government target. For a full load of every transfer station, the complement schemes were also presented and contrasted based on GIS analysis. The results have great theoretical and practical significance in transregional treatment and improving resource management level of MSW.     

Variations in dissolved inorganic carbon species in effluents from large-scale municipal wastewater treatment plants (Qingdao,China) and their potential impacts on coastal acidification

Environmental Science and Pollution Research - With rapid development of global wastewater treatment plants (WWTPs), acidification and enhanced CO2 release in receiving waters caused by high-CO2...     

高职《旅游学概论》课程教学改革研究

基于对高职《旅游学概论》在教学中存在的诸多问题进行的分析,结合高职旅游专业学生的特点,对教学内容、教学方法、考核方式等几方面的改革和创新进行了阐述。     

北京大气气溶胶部分无机组分及相关气体的浓度变化

利用SJAC-MOBIC在2000-05～2000-09的3个采样时段测量了北京大气中的气溶胶SO₄^2-、NO₃^-、NO₂^-、Cl^-及相关气体组分,得出了这些污染组分的逐时变化.结果表明气溶胶Cl^-、NO₂^-、NO₃^-及气体HCl、HNO₂和HNO₃有明显的变化规律,SO₂和气溶胶SO₄^2-的变化取决于SO₂的排放,SO₄^2-的峰值一般比SO₂的峰值晚2h左右.     

Supported single-atom catalysts: synthesis,characterization, properties,and applications

In recent years, there has been a wide research in supported single-atom catalysts (SACs), which contain only isolated individual metal atoms dispersed on an appropriate support or coordinated with the surface atoms of the support. The SACs exhibit many fascinating characteristics including high activity, selectivity, and maximum atomic utilization. These characteristics arise from the low coordination status, quantum size effect, and the strong metal–support interaction, which have proved to be very powerful in many typical heterogeneous catalysis field including oxidation, hydrogenation, the water–gas shift reaction, methanol steam reforming, electrocatalysis, and photocatalysis. In this review, we summarized the recent progress in synthesis, characterizations, properties, and applications of SACs.     

华北油田岔南联合站污水处理技术改造及效益分析

采油污水必须经过处理达到油田注水水质控制指标才能回注。华北石油管理局第二采油厂岔南联合站建成投产后，采取了选用合适的化学药剂，改善加药方法等措施，使岔南联合站污水水质得到较大改善，达到了油田注水水质控制指标，并同时收到了减少电耗和化学药剂使用量，节约成本的效果。环境效益和经济效益都十分显著。本文介绍了该站污水处理系统技术改造的试验过程及效果。     

Observation of the nighttime nitrate radical in Hefei, China

Observation of nighttime nitrate radical (NO3) was performed by using long path differential optical absorption spectroscopy (LP-DOAS), on the outskirts of Hefei, China. The time series of NO3 and supporting parameters were simultaneously measured for a week (31 May-7 June 2006). The results indicated that the average concentration of NO3 was 15.6 pptv with an average lifetimes of 96 s, whereas, NO3 production rates varied from 8×105/(cm3·s)to 2.98×107/（cm3·s）. Furthermore, the calculated N2O5 concentration averaged at 380 pptv. Analysis of data indicated that direct sinks were probably dominating the NO3 loss process during this campaign. Finally, the results were compared with other campaigns in the boundary layer.     

大气气溶胶无机组成的FTIR测定及与离子色谱分析的比较

利用傅立叶变换红外光谱仪，固体制样方式，对北京市中关村地区的气溶胶样品中的无机组成进行了分析，并对气溶胶样品中的ＳＯ４＾２－，ＮＨ４＾＋和ＮＯ３＾－进行了定量测定，为检验ＦＴＩＲ测定法的可靠性，将ＦＴＩＲ法与离子色谱的测定结果进行了对照分析，结果表明，ＳＯ４＾２－和ＮＨ４＾的ＦＴＩＲ测定结果与离子色谱有较好的相关性。     

Influence of micro-organisms on the dissolution of metallic platinum emitted by automobile catalytic converters

Platinum emitted by automotive catalyst converters mainly exists in the metallic form, which is not bioavailable. Several investigations showed that finely dispersed metallic platinum is dissolved in organic matrices to a significantly high degree [1,2]. In an exclusion experiment, observations were made as to whether the transformation of Pt(0) and other platinum compounds is mainly of a chemical nature or is influenced by micro-organisms. A previous experiment [2], concerning the interaction of several platinum compounds with a clay-like humic soil was repeated under sterile conditions to rule out the influence of micro-organisms. During the time of interaction (3–60 d), no significant differences were observed between the sterile and non-sterile modes. Thus, the dissolution of metallic platinum into soluble species, observed previously within this time period [2], seems to be mainly of a chemical nature. On leave from Liaoning University, Department of Chemistry, 110036 Shenyang, PR China     

Study on the water quality of the Taihu Lake using genotoxicological methods

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