高浓度氨氮稀土废水的吹脱试验研究

对高浓度氨氮稀土废水,采用正交试验法进行了氨氮吹脱试验,研究了pH值、温度、吹脱时间及气液比对吹脱效率的影响.试验结果表明,影响氨氮吹脱效率的因素主次顺序为:pH》温度》吹脱时间》气液比,较佳的水平条件分别为:pH≥12,温度T=30 ℃,时间t=1 h,气液比=2000,在此条件下,氨氮去除率达90%以上.     

吹脱法处理高浓度氨氮废水研究

对吹脱法处理某高浓度氨氮废水进行了研究,考察了温度、pH值、气液比、原水浓度对吹脱试验的影响。结果表明,在最佳工艺条件下,废水的氨氮去除率超过99.31%。同时,比较不同酸吸收液对吹脱出气的吸收效果,找到最合适的酸吸收液。     

AC废水的氨氮脱除

阐述了脱氨氮的方法,重点介绍了吹脱法处理含氨氮的AC废水,经过试验得到吹脱的较佳条件：pH11,温度70℃,气液比1000,吹脱时间2h,在此条件下氨氮脱除率为96％以上,吹脱后的废水可进行生化处理。     

空气吹脱法脱除废水中二甲胺的影响因素研究

采用空气吹脱法脱除废水中的二甲胺.考察了碱液浓度、温度,吹脱时间、气液比、喷淋强度对二甲胺去除率的影响.正交试验表明,在碱液浓度为0.5 mol·L~(-1),温度为80℃,吹脱时间为3 h,气液体积比为3 500,喷淋强度为3.0m~3·m~(-2)·h~(-1)的条件下,废水中二甲胺去除率高达95%.而且在该条件下,废水经吹脱处理后二甲胺的质量浓度由61 920mg·L~(-1)减少到49mg·L~(-1),达到国家污水排放标准.     

电化学氧化协同吹脱法去除苯基胍废水中氨氮的实验研究

采用电化学氧化协同吹脱法对苯基胍废水进行处理,考查其对NH₃-N的氧化脱除效果。实验结果表明,废水初始氨氮浓度、pH值、反应电流、吹脱气液比、反应/吹脱时间均对废水的NH₃-N去除率产生影响。苯基胍废水去除氨氮的最佳处理条件为：氨氮初始浓度3 500 mg/L、初始pH值为10,反应电流3 A,吹脱气液体积比3 000∶1,反应时间40 min。氨氮去除率最高达91%。     

吹脱法处理喷漆线废水的行为特性

为研究吹脱法处理喷漆废水的行为特性,考察了在不同初始p H值、温度、气液比和吹脱时间等因素作用下,吹脱法对喷漆线废水COD去除率的影响。实验结果表明,当喷漆线废水初始浓度为2 300 mg/L时,在pH值为9,温度为55℃,气液比为90,吹脱时间为2.5 h的最佳吹脱条件下,后水的COD质量浓度为1 064.5 mg/L,去除率可接近55.0%。结论表明,吹脱法可以作为喷漆线废水的预处理方法。     

吹脱法处理稀土氯铵废水的实验研究

对吹脱法处理稀土氯铵废水进行了研究,分别考察了温度、pH值、气液比、吹脱时间对实验的影响。结果表明,在最佳实验条件下,氨氮的去除率可达到98%以上。用硫酸吸收了尾气,实现了资源回用,避免了二次污染。     

高氨氮含量废水组合吹脱处理工艺实验研究

针对氨氮吹脱法结合吹脱装置及工艺对氨氮去除效果的研究工作较少的情况,基于氨氮吹脱过程的气液传质机理,进行了单一填料塔、旋流塔及填料与旋流塔组合工艺进行废水氨氮吹脱处理工艺对氨氮处理效果的实验研究.结果 表明,组合氨氮吹脱处理工艺的氨氮去除率达到89.87％,比单一氨氮吹脱处理工艺的氨氮去除率提高25％以上.其中填料与旋...     

化学沉淀法处理中晚年垃圾填埋场渗滤液技术研究

针对中晚年垃圾填埋场渗滤液高浓度氨氮影响生化系统运行,研究采用灵活增设磷酸铵镁化学沉淀法达到降低氨氮浓度。试验考察了沉淀时间、pH、药剂投加配比等因素对中晚期垃圾渗滤液中氨氮去除的影响。在最佳条件下,氨氮的去除率为95%,为后续的生化单元提供了保障。     

吹脱法去除垃圾渗滤液中氨氮的技术进展

介绍了吹脱法在垃圾渗滤液氨氮脱除方面的研究进展,着重对渗滤液氨氮吹脱的关键因素、联合技术和工程应用进行了总结和分析,并对今后垃圾渗滤液氨氮吹脱技术的研究提出了建议。     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

聚酰亚胺的合成法

本文评述了缩聚型聚酰亚胺的主要合成方法和近年来国际上在合成中所做的探索。