排序方式: 共有111条查询结果,搜索用时 334 毫秒
21.
Qi Yin Xiaoyu Zhu Guoqiang Zhan Tao Bo Yanfei Yang Yong Tao Xiaohong He Daping Li Zhiying Yan 《环境科学学报(英文版)》2016,28(4):210-214
The anaerobic digestion(AD)and microbial electrolysis cell(MEC)coupled system has been proved to be a promising process for biomethane production.In this paper,it was found that by co-cultivating Geobacter with Methanosarcina in an AD–MEC coupled system,methane yield was further increased by 24.1%,achieving to 360.2 m L/g-COD,which was comparable to the theoretical methane yield of an anaerobic digester.With the presence of Geobacter,the maximum chemical oxygen demand(COD)removal rate(216.8 mg COD/(L·hr))and current density(304.3 A/m_3)were both increased by 1.3 and 1.8 fold compared to the previous study without Geobacter,resulting in overall energy efficiency reaching up to 74.6%.Community analysis demonstrated that Geobacter and Methanosarcina could coexist together in the biofilm,and the electrochemical activities of both were confirmed by cyclic voltammetry.Our study observed that the carbon dioxide content in total gas generated from the AD reactor with Geobacter was only half of that generated from the same reactor without Geobacter,suggesting that Methanosarcina may obtain the electron transferred from Geobacter for the reduction of carbon dioxide to methane.Taken together,Geobacter not only can improve the performance of the MEC system,but also can enhance methane production. 相似文献
22.
23.
An optimized nonlinear grey Bernoulli model was proposed by using a particle swarm optimization algorithm to solve the parameter optimization problem. In addition, each item in the first-order accumulated generating sequence was set in turn as an initial condition to determine which alternative would yield the highest forecasting accuracy. To test the forecasting performance, the optimized models with different initial conditions were then used to simulate dissolved oxygen concentrations in the Guanting reservoir inlet and outlet (China). The empirical results show that the optimized model can remarkably improve forecasting accuracy, and the particle swarm optimization technique is a good tool to solve parameter optimization problems. What's more, the optimized model with an initial condition that performs well in in-sample simulation may not do as well as in out-of-sample forecasting. 相似文献
24.
地下水污染程度评价是地下水研究领域的研究热点。以场地浅层地下水为研究对象,基于目前国内工业场地有无防渗措施的分类原则,综合考虑污染源和场地包气带特征因子,构建了地下水污染源强分级评价指标体系。将修正的内梅罗污染指数法应用于污染源危害性分级,并将改进后的DRTAS模型应用于包气带阻控性分级,利用矩阵法构建两方面多因素耦合模型,最后形成了适合典型工业场地的地下水污染源强分级评价的方法。选择4个典型污染场地对评价方法进行实地验证,分析结果表明,对于已建的或拟建的有防渗措施的项目,污染源危害性是造成场地地下水污染的主因;对于已建的无防渗措施项目,污染源危害性和包气带阻控性共同决定地下水污染源强。场地评价结果与水质监测报告结论相符,说明本研究建立的分级评价方法对于地下水污染的预防和控制具有借鉴意义。 相似文献
25.
26.
27.
基于哺乳动物的传统毒性测试方法存在周期长、成本高、通量低、有动物伦理限制等诸多问题。斑马鱼因为个体小、发育快、易于饲养等特点,适用于构建基于多孔板的中高通量毒性测试方法。本文对基于多孔板的斑马鱼急性毒性、发育毒性、行为和微行为分析等几个中高通量测试方法进行了综述,分析了各自的优缺点及应用现状。另外介绍了高通量测试在自动化操作方面的最近进展。最后分析了斑马鱼中高通量毒性测试方法未来的发展趋势和应用前景,提出应着重开展对现有方法的验证和优化工作,减少对人工的依赖,实现自动化操作和标准化分析,同时开发可更敏感检出发育毒性的分子或者信号通路的测试指标。随着斑马鱼高通量毒性测试方法不断的发展和优化,其在化学物质毒性筛查和风险评估中将发挥越来越重要的作用。 相似文献
28.
亚太经济合作组织(APEC)是亚太地区最具影响的经济合作官方论坛。APEC框架下的贸易和投资委员会下设8个工作组/分委会和3个工业对话会,其中,化工对话会作为亚太地区最大的化工行业交流平台,致力于加强监管合作,促进经济体贸易,提升化学品健全管理能力,推动化工行业可持续发展。化工对话会设置监管合作与融合、全球化学品统一分类与标签制度、信息交换、海洋垃圾和可持续发展等4个工作组,重点围绕各工作组工作计划和成果开展交流讨论。本文系统梳理了化工对话会的产生背景、架构,介绍了各项议题的最新进展,并就我国参与化工对话会的应对策略给出了建议,以期为后续会议讨论及我国化学品环境管理提供参考。 相似文献
29.
30.
在自动扶梯(人行道)的检验过程中,关于安全距离和尺寸的测量项目众多,特别是针对防夹装置、防护挡板以及扶手带周围距离等项目的检验,烦琐复杂且费时费力.本文简要讨论了国内自动扶梯典型事故、自动扶梯(人行道)安全距离和尺寸的检验难点以及目前市场上的解决方案,开发出专用工具箱,从而有效提高检验准确率和效率. 相似文献