有机废水两相厌氧消化工艺相分离问题的探讨

本文通过对厌氧微生物代谢机理和有关实验结果的分析，对两相厌氧消化工艺中的分相同题进行了深入探讨，澄清了产酸相和产甲烷相的概念，讨论了相分离的可行性和途径，并解释了一些试验中出现的问题。     

模糊聚类分析洁在哈密市环境噪声质量评价中的应用

采用模糊聚类分析方法．对哈密市多年来城市环境噪声监测数据，进行了质量评价。结果表明，该市受到噪声中污染的Ⅳ级水平，提出了相应建议。     

Association between population density and infection rate suggests the importance of social distancing and travel restriction in reducing the COVID-19 pandemic

Environmental Science and Pollution Research - Currently, 2019-nCoV has spread to most countries of the world. Understanding the environmental factors that affect the spread of the disease COVID-19...     

Decomposition and decoupling analysis of carbon emissions from agricultural economic growth in China's Yangtze River economic belt

Environmental Geochemistry and Health - In this study, carbon emissions from agricultural energy consumption (CEAEC) are fully analyzed using data from the Yangtze River Economic Belt (YEB) between...     

Enhanced adsorptive removal of naphthalene intermediates from aqueous solution by introducing reed straw into sewage sludge-based activated carbon

The disposal of sewage sludge (SS) and reed straw (RS) has becoming a critical issue due to their rapid production. In this study, the SS-based activated carbon (SSC) was produced by introducing the RS as a component material. Properties including BET surface area, pore volume, surface chemical groups, and morphologies were characterized. The adsorption of 1-diazo-2-naphthol-4-sulfonic acid (1,2,4-Acid) and 2-Naphthol (2-Nap), which differs in their physicochemical properties, on as-prepared carbons were investigated. The overall adsorption was found to be jointly controlled by external mass transfer and intraparticle diffusion, and the optimal pH was found to be 5 due to their electrostatic attraction. Further study revealed that the SS- and RS-based carbons (SC and RSC, respectively) exhibited different adsorption behavior toward 1,2,4-Acid and 2-Nap. The calculated adsorption capacity from Langmuir–Freundlich model of SC and RSC for the two intermediates was 141.0, 84.6 mg g^-1 and 48.2, 110.2 mg g^-1, respectively, whereas their hybrid product (SSC) showed comparable capacity for 1,2,4-Acid (117.8 mg g^-1), as well as higher capacity for 2-Nap (157.5 mg g^-1). It was found that the presence of meso- or macropores facilitates the precipitation of mineral phases of inorganic substances during carbonization, attracting the molecules with polar functional groups, while the introduction of C-rich RS to SS enhances the adsorption of hydrophobic molecules.     

An improved biofilter to control the dissolved organic nitrogen concentration during drinking water treatment

Environmental Science and Pollution Research - Dissolved organic nitrogen (DON) is a key precursor of numerous disinfection by-products (DBPs), especially nitrogenous DBPs (N-DBPs) formed during...     

Nitrogen use efficiencies in Chinese agricultural systems and implications for food security and environmental protection

Regional Environmental Change - Nitrogen (N) use efficiency (NUE) is an important indicator to evaluate the performance of N use in agricultural systems. Understanding changes in NUE is crucial to...     

基于N-GAS模型的某沙发厂火灾烟气中HCN分布及烟气毒性分析

引入湍流涡耗散概念(EDC)模型,以昆明市某沙发工厂火灾,获得了含有HCN的火灾烟气浓度的时空分布,采用N-GAS模型来评价火灾烟气综合毒性并讨论HCN对于多组分烟气耦合毒性的影响。为了讨论HCN对火灾烟气毒性的影响,本文进行了A、B两组模拟计算,A组烟气组分不包含HCN,B组烟气组分包含HCN。将A、B两组的模拟结果进行对比,验证了引入EDC模型、讨论HCN对多组分火灾烟气毒性的影响具有可行性。基于N-GAS模型的计算结果,说明了HCN气体对于多组分烟气的耦合毒性的影响不可忽略,有时甚至起着至关重要的作用。     

聚乙烯醇缩-5-甲酰基-2,4-二羟基苯偶氮安替比林液-固萃取和光度测定镍的研究

本文报道了2,4-二羟基-5-安替比林偶氮苯甲醛(DAP)及DAP与聚乙烯醇(PVA)的缩合产物(PV·DAP)的合成.并利用PV·DAP做萃取剂,析相萃取和光度测定了铝合金和环境水样中的镍.实验结果还表明,高分子显色剂与相应的小分子试剂相比,在液-固萃取方面表现为易获得高萃取率且不受萃合物电性的影响,在光度测定方面则表现出较高的灵敏度和稳定性.从而说明试剂的高分子化可改善其性能.     

文丘里水膜除尘器后烟气带水的原因及控制对策

通过对一些文丘里水膜除尘器运行情况的实际调查,分析了烟气带水和风机挂灰振动的可能原因,针对不同情况提出了控制烟气带水危害的可行措施。