Coupled Monte Carlo simulation and Copula theory for uncertainty analysis of multiphase flow simulation models

Environmental Science and Pollution Research - Simulation-optimization techniques are effective in identifying an optimal remediation strategy. Simulation models with uncertainty, primarily in the...     

A real-time optimization method for economic and effective operation of electrostatic precipitators

ABSTRACT

Electrostatic precipitators (ESP) have been considered as the main particulate matter (PM) removal facility in the energy industry. This paper presents a real-time optimization method for a one-chamber industrial ESP in an ultra-low emission power plant with an intelligent optimization system (IOS). The IOS seeks to optimize the energy consumption of ESP subject to the outlet concentration requirement in real-time. A coordination control logic is designed to regulate the optimized operation set points with varying operation conditions. The operation optimized by the IOS is compared with the operations under PID (proportion-integral-derivative) and manual control. The results show that the IOS improves the emission compliance rate from 95% of manual control to 100% and the medium concentration is tuned to be 46.6% closer to the emission target. Furthermore, a good balance between emission and energy consumption is achieved, with 35.50% energy conservation for the same emission upper limit of 30 mg/m³. These results prove that the IOS significantly contributes to the efficient operation and economic PM removal by ESP for the energy industry.     

中国东部季风区末次冰期以来古气候模拟

通过对我国东部季风区现代青土样品孢粉组合与气候因子间的回归分析,分别建立了孢粉组合与一月,七月气温和年降水量的转换函数,进而建立了本区末次冰期以来的孢粉－气候数据库,模拟末次冰期盛冰期,消冰期,全新世前北方期－北方期,大西洋期,亚北方期等五个古气候期的冬季和夏季温度场,降水场。     

以pH和ORP作为脉冲SBR工艺的实时控制参数

为了实现脉冲SBR深度脱氮的实时控制，以某污水处理厂市政污水为处理对象，考察了脉冲SBR在深度脱氮过程中pH及ORP的变化规律。试验结果表明，pH及ORP的变化规律与脉冲SBR有机物去除、硝化与反硝化过程存在较好的相关关系。可以根据pH和ORP变化曲线上的特征点对脉冲SBR进行实时控制。并考察了污水C／N（COD／NH4^＋-N）对pH及ORP的变化规律的影响。在硝化过程中，C／N对pH及ORP曲线变化点的出现没有影响；在反硝化过程中，应结合pH值“硝酸盐峰”和ORP“硝酸盐膝”来判断低C／N污水反硝化的终点。在该试验中，出水TN低于2mg／L，TN去除率可达到96％以上。     

Mercury uptake by Paspalum distichum L. in relation to the mercury distribution pattern in rhizosphere soil

Environmental Science and Pollution Research - Paspalum distichum L. was tested to evaluate their phytoremediation capacity for Hg contaminated soil through analyzing the dissipation of Hg in soil...     

Trends of ischemic heart disease mortality attributable to household air pollution during 1990–2019 in China and India: an age-period-cohort analysis

Environmental Science and Pollution Research - Cardiovascular diseases (CVD) caused by household air pollution (HAP) have sparked widespread concern globally in the recent decade. Meanwhile,...     

排污收费对企业污染控制技术创新激励作用的研究

运用模型方法研究了排污收费和行政手段对企业污染控制技术创新的激励作用,为环境管理政策应用提供了理论依据。结果表明,无论对创新企业还是模拟企业,在“技术创新－创新扩散－最优啮合反应”的技术创新过程中,排污收费更能刺激企业的污染控制技术创新行为。     

电解锰废水中锰（Mn^2＋）和氨—氮（NH3—N）的处理

本文讨论了沉淀法和空气提气法去除电解锰废水中含有的锰(Mn~(2+))和氨-氮(NH_3-N),并研究了该方法的最佳条件,为废水日排放量在300—400T之间的工厂设计了废水处理路线。结果表明,上述方法处理后的废水中Mn~(2+)和NH_3-N含量达到或低于国家污水排放标准。     

小麦苗期叶片PSⅡ结构与功能对光胁迫的响应

以扬麦 5号苗期叶片的类囊体膜和PSⅡ颗粒为对象 ,测定光胁迫条件 (2 50 0 μmol·m- 2 ·s- 1 )下PSⅡ组分和功能特性的变化。光逆境条件下 ,类囊体膜及PSⅡ颗粒的放氧活性明显下降。室温下荧光发射光谱的测定结果也表明 ,光逆境处理导致类囊体膜及PSⅡ颗粒荧光发射强度下降。多肽组分变化的分析显示 ,PSⅡ颗粒外周蛋白OEC 33 0 0 0u多肽对光胁迫响应最为敏感 ,降解较显著 ,外周蛋白OEC 1 70 0 0、2 3 0 0 0u和行使光能捕获功能的CP43多肽也先后有不同程度的降解     

淮河流域人地系统的自组织分析

本文从系统论的角度出发 ,从组织序变、耗散结构、协同互补、系统演化的动力机制等方面分析了淮河流域人地系统的优化、平衡及有效调控机理 ,为实现淮河流域的可持续发展提供理论依据 ,并提出了提高系统的自组织能力、激活系统的动力机制的战略举措