含硫化氢油田地面工程设计实践与认识

文章分析了硫化氢(H2S)的危害,提出了含H2S油田地面工程设计思路。在长庆油田现有工艺流程的基础上,针对硫化氢的危害,通过采用地面工艺全流程密闭、选用抗硫工艺设备、管材等工艺技术,实现油田安全清洁生产,确保油田安全、高效开发。     

改性活性炭脱除硫化氢工艺参数研究

针对改性活性炭脱除硫化氢过程,研究了空速、温度、原料气浓度、颗粒分布孔径4个主要工艺参数对脱硫效率的影响。结果表明:空速在1 500～4 200h-1时穿透硫容随着空速的降低而增加,当空速继续降低为1 200h-1时穿透硫容基本不变;当0～40℃时,随着温度的升高,穿透时间增加,脱硫效率提高,当温度超过40℃时,随着温度继续升高脱硫效率降低;相同空速下原料气硫化氢浓度变化只改变穿透时间;改性活性炭脱硫剂发挥脱硫作用的微孔结构范围是1～5nm。     

The changes of nitric oxide production during the growth of Microcystis aerugrinosa

This study characterized the changes of nitric oxide (NO) production during the growth of Microcystis aerugrinosa, a cyanobacterium which usually cause cyanobacterial blooms. Results showed a drastic NO release accompanying with cell density and Chl-a content sharp rises when M. aerugrinosa grew from fifth day to sixth day. Moreover, high N:P ratio accelerated the cyanobacterial growth and NO burst. Sodium nitroprusside, an exogenous NO donor, promoted M. aerugrinosa growth with the optimal concentration of 0.1 mg/L. Experiments by supplementing with sodium nitrite and l-arginine demonstrated NO production in M. aerugrinosa cells was mainly through nitrate reductase (NR) pathway while minorly through NO synthase pathway. All these data suggested M. aerugrinosa produced increasing NO during its growth mainly by NR pathway, during which NO positively regulated the growth of M. aerugrinosa.     

预氯化工艺去除水中氰化物、硫化物及水合肼等还原性污染物研究

以较常见的预氯化为技术手段,考察了预氯化工艺去除饮用水中氰化物、硫化物以及水合肼等还原性污染物的效果和影响因素.结果表明:(1)实验条件下氰化物浓度随有效氯投加量的增加而下降,并在有效氯投加量＞5.0 mg/L时降低到低于《生活饮用水卫生标准》(GB5749-2006)中限值(0.05mg/L),在有效氯投加量＞6.0...     

曝气对两种人工湿地污水净化效果的影响

采用复合垂直流和水平潜流2种人工湿地处理混合污水,研究了在气水比(曝气体积/湿地进水体积)为2、4、6、8和10时2种人工湿地对污水的净化效果.结果显示:(1)复合垂直流人工湿地以气水比为2进行曝气时,对污水的净化效果最好,上行池出水的COD、TN、NH4+-N、NO3--N平均去除率比不曝气时分别提高了16.47%、...     

UASB反应器中厌氧氨氧化菌的影响因素研究

在UASB反应器中接种实验室已经驯化好的厌氧氨氧化颗粒污泥,对其进行厌氧氨氧化菌活性提高和影响因素的实验研究。研究表明厌氧氨氧化菌对NH4＋-N和N02--N的适宜浓度负荷均为200mg／L,适宜水力停留时间HRT、温度、pH和进水基质比（N02--N／NH4＋-N）分别为2h、30～35℃、7．5～8．5和0．95～1．2,NH4＋-N、NO2--N和TN的平均去除率分别为97．1％、98．3％和92．7％。     

计算流体动力学在火电厂SCR系统流场优化中应用及研究进展

作为一种设计和分析的工具,计算流体力学（CFD）技术已成功应用于火电厂选择性催化还原（SCR）系统设计中,提供了大量物理模型或现场试验不能得到的数据。介绍了近年来国内外CFD技术在选择性催化还原（SCR）中的研究及应用进展,指出该研究目前存在的问题及发展方向。     

Determining C/N ratios for typical organic wastes using biodegradable fractions

It is well established that an optimal aerobic and anaerobic microbial metabolism is achieved with a C/N ratio between 20 and 30. Most studies are currently based on chemically-measured carbon and nitrogen contents. However, some organic wastes can be composed of recalcitrant carbon fractions that are not bioavailable. To know the biodegradable C/N ratio, two different methods to determine the aerobic and anaerobic biodegradable organic carbon (BOC_AE and BOC_AN) are proposed and used to analyze a wide variety of different organic samples. In general, raw wastes and digested products have more amount of BOC_AE. On the contrast, the samples collected after an aerobic treatment have higher content of BOC_AN. In any case, all the BOC fractions are lower than the total organic carbon (TOC). Therefore, the C/N ratios based on BOC are always lower than the total C/N ratio based on the TOC measure. The knowledge of the real bioavailable C/N ratio is crucial for the biological treatments of organic materials. To reduce the test time necessary for BOC determination, the values of BOC for all the samples obtained at different times were compared and correlated with the final BOC. A method that allows for the determination of BOC_AE in 4 d is proposed. In relation to the anaerobic assay, the biogas potential calculated after 21 and 50 d was positively correlated with the final potential defined after 100 d of assay.