电镀工业污染最小化技术

通过分析电镀行业工艺现状,总结了电镀工业废水的产生,特性,现有的治理措施及存在的问题,提出了更新原料,减少用水量及提高回收率污染最小化技术的方案。事实证明,实行污染最小化技术是电镀行业减小污染排放,提高经济效益切实可行的方法。     

Double-Melting Behavior of Bamboo Fiber/Talc/Poly (Lactic Acid) Composites

The melting and crystallization behavior of pure poly (lactic acid) (PLA) and PLA composites (1% Bamboo Fiber (BF)/PLA, 1% Talc/PLA, 1% BF/1% Talc/PLA) were studied with differential scanning calorimetry (DSC). DSC curves for PLA composites were obtained at various cooling rates, the crystallization temperature and heat of crystallization of PLA composites decreased almost linearly with increasing of log (cooling rate). Moreover, BF has minor effect and talc has the great effect on the crystallization temperature in the PLA composites. With increasing of cooling rate, the main melting temperature of PLA composites decreased. In pure PLA and 1% BF/PLA, the double-melting behavior appeared in the heating curves after slow rate of cooling, and there was the opposite phenomenon of double-melting behavior in other two PLA composites. BF promotes forming the imperfect crystal in the PLA composites during heating process. With increasing of heating rate, the main melting temperature of PLA composites increased except the 1% BF/PLA. At various heating rates, the defects of BF structure promoted the melt-recrystallization and talc promoted forming the small crystals. At last, the recrystallization model was given.     

Influences of accumulated mileage and technological changes on emissions of regulated pollutants from gasoline passenger vehicles

In this study, the influences of accumulated mileage(deterioration) and technological changes(emission standards) on emission factors(EFs) of regulated pollutants(CO, HC, and NO_x) from gasoline passenger vehicles were investigated based on Inspection and Maintenance(I/M) data using the chassis dynamometer method. The accumulated mileage of passenger vehicles was significantly linearly correlated with vehicle age. For most cases,the average EFs of CO, HC and NO_x were significantly linearly correlated with accumulated mileage, indicating that emission deterioration had a significant impact on pollutant EFs.Implemented emission standards markedly influenced the EFs of regulated pollutants, and EFs markedly decreased with progressing emission standards. The present study also compared EFs of regulated pollutants between this study and the International vehicle emission(IVE) model, and marked differences in EFs were seen with variations in emission standards, vehicle types and accumulated mileage; NO_x EFs in this study were higher than in the IVE model. The results provide new insight into estimating regulated pollutant emissions using the IVE model.     

离子色谱在监测土霉素结晶母液废水处理过程中土霉素含量的研究

土霉素结晶母液是一种含高硫高氮的高浓度难生物降解有抽废水,有用前置反硝化法对其进行脱氮处理过程中,残留的土霉素等对反硝化有明显的生物和抑制作用,用离子色谱法（以0mniPac PCX-100为分离柱,0.2mol.l^-1盐酸－27.9%乙腈（V／V）为淋洗液）测定经预酸化处理后废水中的土霉素含量,分析结果表明,预酸化处理可以显著降解废水中的土壤素,提高其可生化性,该法6min内即可完成土霉素含量的测定,土霉素的检出限为10ug.l^-1.     

Towards sustainable environment: why green energy technology diffusion is sluggish in South Africa?

Environmental Science and Pollution Research - Energy security, job development, and minimal environmental damage are just a few of the reasons why green energy technologies have gained popularity....     

吉林市人工湿地生态环境规划的设想

人们把湿地称为＂地球之肾＂、天然水库和天然物种库。湿地作为重要的自然资源和生态环境,对促进可持续发展战略和保护人类生存环境具有重要意义。素有北国江城和化工城之称的吉林市近年来随着经济和化工产业的飞速发展,污水大量产生,不仅污染了松花江河道,还威胁着下游哈尔滨市和齐齐哈尔市居民的生活和生产安全。因此,治理污水,建设生态自然河道,保护地下水源,是当务之急。本文围绕在吉林市松花江下游段开发人工湿地生态环境问题进行讨论,旨在提出建设性设想,探讨可行性措施。本文认为：人工湿地生态环境的建成,将使水质得到很大程度的净化;同时保护湿地生态环境,开发旅游产品,推进旅游市场;增添城市水景观,提高城市品位;还可以使人们走出都市,回归大自然。     

城市晴日太阳辐射的空间变化

１９９１年在济南市进行了两次太阳辐射强度的流动观测。对观测资料的分析表明，不仅市区的太阳辐射强度明显小于郊区，而且处于下风向的近郊区的太阳辐射强度也明显小于上风向郊区；市区内不同功能区的太阳辐射减弱程度不同，以工业区减弱最甚；太阳辐射强度的空间变化形式与城市功能区的布局密切相关。     

Stabilization of hexavalent chromium with pretreatment and high temperature sintering in highly contaminated soil

• Separate reduction and sintering cannot be effective for Cr stabilization. • Combined treatment of reduction and sintering is effective for Cr stabilization. • Almost all the Cr in the reduced soil is residual form after sintering at 1000°C. This study explored the effectiveness and mechanisms of high temperature sintering following pre-reduction with ferric sulfate (FeSO₄), sodium sulfide (Na₂S), or citric acid (C₆H₈O₇) in stabilizing hexavalent chromium (Cr(VI)) in highly contaminated soil. The soil samples had an initial total Cr leaching of 1768.83 mg/L, and Cr(VI) leaching of 1745.13 mg/L. When FeSO₄ or C₆H₈O₇ reduction was followed by sintering at 1000°C, the Cr leaching was reduced enough to meet the Safety Landfill Standards regarding general industrial solid waste. This combined treatment greatly improved the stabilization efficiency of chromium because the reduction of Cr(VI) into Cr(III) decreased the mobility of chromium and made it more easily encapsulated in minerals during sintering. SEM, XRD, TG-DSC, and speciation analysis indicated that when the sintering temperature reached 1000°C, almost all the chromium in soils that had the pre-reduction treatment was transformed into the residual form. At 1000°C, the soil melted and promoted the mineralization of Cr and the formation of new Cr-containing compounds, which significantly decreased subsequent leaching of chromium from the soil. However, without reduction treatment, chromium continued to leach from the soil even after being sintered at 1000°C, possibly because the soil did not fully fuse and because Cr(VI) does not bind with soil as easily as Cr(III).     

某高密度街区大气颗粒物质量浓度分布特征实测研究

为研究城市高密度街区大气颗粒物浓度分布特征,2019年秋季对上海市某高密度街区道路大气颗粒物浓度、空气温度、相对湿度、地理位置、车辆与道路图像视频信息进行了同步移动在线监测,并结合街区内固定站数据和后向轨迹模拟结果,总结了影响街区大气颗粒物浓度变化的主要因素。结果表明:城市大气颗粒物背景拟合值处于较低水平时,街区内的大气颗粒物浓度变化和影响因素易被识别;机动车污染源对大气颗粒物浓度贡献大,其中大型机动车的影响明显;户外施工和道路清扫会引起大气颗粒物浓度上升,其中PM₁₀上升更明显;交通密度大的十字路口大气颗粒物浓度通常较高;城市高架的盖状结构会阻碍大气颗粒物在垂直方向上的扩散,引起局部大气颗粒物浓度上升;街区内高大浓密的乔木对近地面的大气颗粒物屏蔽效果不理想,甚至有助于颗粒物累积;早晚高峰时段大气颗粒物浓度较非高峰时段高。     

The effects of deterioration and technological levels on pollutant emission factors for gasoline light-duty trucks

Vehicle deterioration and technological change influence emission factors (EFs). In this study, the impacts of vehicle deterioration and emission standards on EFs of regulated pollutants (carbon monoxide [CO], hydrocarbon [HC], and nitrogen oxides [NO_x]) for gasoline light-duty trucks (LDTs) were investigated according to the inspection and maintenance (I/M) data using a chassis dynamometer method. Pollutant EFs for LDTs markedly varied with accumulated mileages and emission standards, and the trends of EFs are associated with accumulated mileages. In addition, the study also found that in most cases, the median EFs of CO, HC, and NO_x are higher than those of basic EFs in the International Vehicle Emissions (IVE) model; therefore, the present study provides correction factors for the IVE model relative to the corresponding emission standards and mileages.

Implications: Currently, vehicle emissions are great contributors to air pollution in cities, especially in developing countries. Emission factors play a key role in creating emission inventory and estimating emissions. Deterioration represented by vehicle age and accumulated mileage and changes of emission standards markedly influence emission factors. In addition, the results provide collection factors for implication in the IVE model in the region levels.