Fenton氧化-曝气生物滤池处理纤维板废水的试验研究

对Fenton氧化-曝气生物滤池处理纤维板厂好氧出水进行系统研究.试验表明,在FeSO4·7H2O投加量为0.003 mol·L-1,进水pH为5.0,n(H2O2)/n(Fe2+)为2∶1,反应时间为2 h的条件下,Fenton试剂对COD的去除率可以达到65%以上,出水BOD5/COD提高到0.36.氧化后废水进入...     

Fenton氧化法降低炼油汽提净化水中COD的研究

实验采用Fenton氧化法处理炼油汽提净化水,考察了H2O2的添加量、Fe SO4·7H2O添加量、p H、反应时间对炼油汽提净化水中COD的影响。实验结果表明:炼油汽提净化水为200 m L(初始COD值为1883 mg·L-1)、体系的p H为4、Fe SO4·7H2O添加量为0.3 g、H2O2/COD质量比为2.16、反应时间为60 min条件下,COD的去除率最高为86%,采用铁锰双金属催化剂的Fenton氧化法可以提高COD的去除率,COD的去除率由86%(Fe SO4·7H2O做催化剂)提高到92%(Fe-Mn双金属催化剂)。     

混凝沉淀-Fenton氧化法处理工业烟草废水研究

通过混凝沉淀-Fenton氧化法处理工业烟草废水.实验结果表明,原废水初始COD为580 mg·L-1,pH=7.混凝沉淀中,当PAC加入量4 mL、PAM加入量1mL、pH=7、环境温度为32℃时,混凝效果最好,COD去除率能达到73％;Fenton氧化处理混凝后废水,当n(H2O2):n(Fe2+)=30:1、H2O2加入量为2 mL、反应pH=3时,Fenton氧化效果最好,COD去除率能达到77％.通过两者联合作用处理后的污水再经生物处理后即可达标排放.     

A/O~2-Fenton-BAF工艺处理焚烧垃圾渗滤液试验研究

以某垃圾焚烧厂渗滤液为对象,采用厌氧-2级好氧(A/O2)-Fenton-曝气生物滤池(BAF)组合工艺进行中试。结果表明,在COD负荷为220 g.m-.3d-1下,COD和氨氮去除率可达到85.3%和92.9%;Fenton反应适宜投加量为H2O2:COD=2,n(Fe2+):n(H2O2)=1,BAF参考设计处理COD负荷为188.6 g.m-3.d-1,处理后出水COD低于80 mg.L-1,氨氮的质量浓度低于2 mg.L-1。通过提升负荷考察其对生化处理的影响,确定高负荷下采用2级好氧对去除氨氮的必要性,为工艺改造应用于工程中提供参考。     

Fenton氧化-混凝联合处理橡胶废水研究

以橡胶厂的工业废水为研究对象,探讨了各种因素对Fenton氧化后废水混凝处理效果的影响,并对H2O2、FeSO4·7H2O和Fe2(SO4)3用量进行L9(33)正交试验,确定Fenton氧化-混凝联合工艺处理橡胶废水的最佳反应条件为:质量分数30%的H2O2、FeSO4·7H2O和Fe2(SO4)3投加量分别为2 mL、0.3 g和0.3 g.与Fenton氧化法和直接混凝法相比,Fenton氧化-混凝联合工艺对橡胶废水处理效果更好,对COD去除率明显高于单独采用2种方法对COD去除率的总和.     

结晶器铜管镀硬铬脱脂废液的处理

以某表面处理公司的结晶器铜管镀硬铬脱脂废液为研究对象,先采用酸化法对废液中的配位铜离子进行破络处理,并通过调节pH使之沉淀析出,再采用Fenton试剂法降低废液的化学需氧量(COD)。研究了破络过程中FeSO4·7H2O的质量浓度和处理时间对破络效果的影响,以及降低COD过程中Fenton试剂的组成、处理时间和pH对废液COD的影响。脱脂废液处理的最佳工艺条件为:破络──FeSO4·7H2O12g/L,2h;降低COD──Fenton试剂为1.5g/LFeSO4·7H2O+4.5mL/LH2O2,pH=6.00,9h。在最佳工艺条件下处理过的脱脂废液澄清、透明,总铜含量满足GB21900-2008的排放要求,COD接近GB21900-2008的排放要求。     

Fenton+水解酸化-好氧生化组合工艺处理液晶显示屏清洗废水

采用Fenton试剂氧化法作为液晶显示屏清洗废水的物化预处理工艺,探讨了H2O2投加量、反应初始p H、反应时间以及H2O2与Fe SO4的投加量比对Fenton试剂氧化效果的影响。结果表明,Fenton试剂对该废水预处理的优化反应条件为:质量分数30%的双氧水投加量1.0 m L/L,反应初始p H为3,反应时间180 min,n(H2O2):n(Fe SO4)为5:1。经过Fenton试剂氧化预处理后的废水通过水解酸化-好氧生化处理后,COD和TOC的生化去除率分别达到94%和93%以上;且经过Fenton试剂氧化预处理后,水解酸化-好氧生化系统的COD容积负荷NV由原来直接生化的0.3~0.35 kg/(m3·d)提高至0.45~0.55 kg/(m3·d)。     

粉煤灰协同非均相Fenton法处理焦化废水的研究

建立了粉煤灰协同非均相Fenton法处理焦化废水,两者协同处理对COD的去除率高于其单独处理之和.通过粉煤灰对废水中有机物的吸附和铁离子的富集,是提高COD去除率的重要因素.考察了粉煤灰投加量、初始pH、H2O2添加量和Fe2+2 质量浓度等因素对降解效果的影响.结果表明,粉煤灰投加量30 g·L-1,初始pH=3,H2O2添加量100mmol·L-1,Fe2+质量浓度280mg·L-1的最佳条件下,经过180min的处理,焦化废水中H2O2分解率达到86.6%,COD去除率达到90.17%.     

厌氧-混凝-UV/Fenton法处理中药浸膏药渣渗滤液研究

采用厌氧-混凝-UV/Fenton工艺处理中药浸膏药渣渗滤液,研究了该工艺的可行性以及相关工艺参数.结果表明,在厌氧反应水力停留时间为8d时,COD去除率达到58.9%;混凝时,氯化铁混凝剂在pH为4、投药量为1.5 g·L-1时COD去除率达到最大值,为53.1%,比硫酸铝混凝剂最佳条件时要高;在UV/Fenton反应时,经氯化铁混凝剂处理的药渣渗滤液,在光照时间120min,pH为5、H2O2与COD量比1,Fe2+与H2O2量比为0.04时,色度、COD去除率均达到最大,且都满足污水综合排放标准(GB 8978-1996)二级标准,该工艺可行.     

UV/Fenton氧化法对苯酚氧化效果的实验研究

研究UV/Fenton氧化法中各个因素对降解水中苯酚的影响,确定UV/Fenton法处理苯酚废水的工艺条件。保持UV/Fenton体系的基准条件不变,通过改变H2O2浓度、n(Fe2+)∶n(H2O2)、废水初始pH值等实验条件,考察这些因素对UV/Fenton法处理苯酚废水效果的影响。结果表明:UV/Fen-ton氧化法对苯酚废水有较好的去除效果和较高的反应速率。当废水初始pH值为3.0时,经30 min的反应,苯酚去除率达到99%,COD去除率达到86%。但是苯酚废水COD去除率滞后于苯酚去除率。UV/Fenton法能够在较短的时间内去除苯酚和COD,H2O2浓度、n(Fe2+)∶n(H2O2)对处理效果影响较大,H2O2浓度决定苯酚去除率和COD去除率,而n(Fe2+)∶n(H2O2)是影响降解速率的主导因素。     

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.     

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…     

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.     

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.     

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。     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。     

典型煤碳燃烧特性研究和数值模拟

本文以三种典型煤的碳燃烧为研究对象，分别采用简单一维沉降燃烧方式和等温加热燃烧方式，实验研究了煤在快速加热条件下，其碳的初期和中，后期燃烧过程。以实验为基础，建立了煤的碳燃烧模型，变工况数值模拟了煤的碳燃烧过程，揭示了煤不同条件下的单颗粒碳燃烧特性。