官厅水库富营养化的水生生态特征评价

对官厅水库进行浮游植物(种类分布、细胞数和生物量)、叶绿素α、水体初级生产力、底栖大型无脊椎动物的种类和密度分布以及水质的理化特性等进行了研究。结果表明,官厅水库某些指标达到或超过富营养化水平,西库的水质比东库明显恶化。官厅水库水质恶化主要受永定河水污染的影响。其次,大坝前网箱养鱼也是影响水质的因素之一。与1982年水质污染比较的结果表明,官厅水库水质富营养化的发展速度是惊人的。     

胶结液注入轮数和体积对微生物加固粉土的影响∗

通过微生物诱导碳酸钙沉积可以将松散土颗粒胶结成整体从而达到加固目的。胶结液的注入轮数和每轮使用的胶结液体积会影响加固效果,但目前关于这方面的研究还不充分。以海相粉土为处理对象,通过室内试验来研究胶结液的注入轮数和体积对加固效果的影响。改变胶结液注入轮数的试验结果表明:随着注入轮数的增加,试样中沉积生成的碳酸钙逐渐增多,碳酸钙的分布比较均匀,加固后的无侧限抗压强度逐渐提高;但当胶结液的注入达到一定轮数后,强度的增长幅度逐渐减缓。改变每轮胶结液体积用量的试验结果表明:胶结液体积的增加会带来碳酸钙数量的增加和强度的提高,但当胶结液体积从1.5Vv(孔隙体积)增加至2Vv后,效果改善不明显。从钙离子用量与无侧限抗压强度的关系也表明,每轮注入的胶结液体积应选择1.5Vv。     

柴油机排放碳颗粒物的催化燃烧

在热天平装置上考察了柴油机和碳颗粒物燃烧催化剂的活性，讨论了样品制备因素对样品失重的影响，这些因素包括碳颗粒物组成、催化剂栽体、催化剂与碳颗粒物质量比，着重筛选了催化剂的组份，得到了组份催化剂ＣｕＣｌ２－ＫＣｏ－ＮＨ４ＶＯ３其５５０℃焙烧后能使样品的Ｔｍ和Ｔｆ值都降低１８０℃以上，并对催化剂的热稳定性进行了研究。     

两级氧化法处理油田压裂返排液

采用两级氧化法处理油田压裂返排液。在次氯酸钠、次氯酸钙、过氧化氢、高锰酸钾4种氧化剂中,次氯酸钠的氧化效果最好。以次氯酸钠作为一级氧化剂,进行一级氧化处理;再分别采用次氯酸钙、过氧化氢、高锰酸钾进行二级氧化处理。在次氯酸钠加入量为40mL/L、一级氧化反应时间为30min、二级氧化反应时间为30min、初始废水COD为3976mg/L的条件下,二级氧化剂过氧化氢、次氯酸钙、高锰酸钾的最佳加入量分别为80,40,40mL/L,对应的COD去除率分别为82.60%,71.50%,83.50%。     

Feasibility of nanoscale zerovalent iron-loaded sediment-based biochar (nZVI-SBC) for simultaneous removal of nitrate and phosphate: high selectivity toward dinitrogen and synergistic mechanism

Environmental Science and Pollution Research - In the process of water treatment, excessive nitrogen and phosphorus pollutants are of great concern. Therefore, we prepared nanoscale zerovalent iron...     

The spatial effect of fiscal decentralization on haze pollution in China

Environmental Science and Pollution Research - The fiscal decentralization system under China’s political centralization affects local economic and environmental policies, and thus has an...     

NO2 catalytic formation,consumption, and efflux in various types of diesel particulate filter

Environmental Science and Pollution Research - The high NO2/NOX ratio in the after-treatment system is beneficial to its performance and achieved by NO catalytic conversion in diesel oxidation...     

Microfiber pollution: an ongoing major environmental issue related to the sustainable development of textile and clothing industry

Environment, Development and Sustainability - Textiles release microfibers to the environment during production, use, and at end-of-life disposal. There is a potentially large and growing risk to...     

Compartmentation and effects of lead (Pb) in the collembolan,Folsomia candida

Environmental Science and Pollution Research - The impact of soil lead (Pb) pollution on survival, growth, and reproduction of the collembolan, Folsomia candida, and Pb compartmentation in its gut...     

Thermal conversion of rice husks and sawdust to liquid fuel

The paper focuses on studying the conversion of rice husks and sawdust into liquid fuel. Rice husks, sawdust and their mixture are pyrolyzed at temperatures between 420 and 540 degrees C, and the main product of liquid fuel is obtained. The experimental result shows that the yield of liquid fuel depends on various factors such as feedstock and temperature. The maximum yields for rice husks, sawdust and their mixture are 56%, 61% and 60% at 465, 490 and 475 degrees C, respectively. Analyses with GC-MS and other apparatus show that the liquid fuel is a complicated compound with low caloric value and can be directly used as a fuel oil for combustion in a boiler or a furnace without any upgrading. Alternatively, the fuel can be refined to be used by vehicles.