浙江省某污水处理厂工艺设计

浙江省某污水处理厂工程总规模为16×104 m3/d,本期建设规模为4×104 m3/d,主体工艺为"A/A/O微曝氧化沟+活性砂反硝化滤池"。本文详细介绍了该处理工艺流程、建构筑物及其配套设备设计参数,可供相关工程参考。     

UCT-MBR工艺在北京市某污水处理厂提标扩容改造中的设计及运行

北京市某污水处理厂设计规模为8×104 m3/d,原采用Carrousel氧化沟工艺,出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级B标准.为满足排放标准的提高和进水量的增加,污水处理厂采用UCT-MBR工艺进行提标改造,改造后设计规模为18×104 m3/d.工程分阶段实施,主体工...     

舒城县污水处理厂设计及运行

舒城县污水处理厂工程总规模为5×104 m3/d,近期规模为2.5×104 m3/d。本污水厂二级生化处理系统采用改良型氧化沟,合理地布置了推流搅拌器,并配置了变频驱动的表曝系统;污泥处理采用一体化浓缩脱水机。本工程设计改善了氧化沟的水力流态,节省了能耗,降低建设投资。污水厂运行至今,运行稳定,处理效果良好。     

勒流街道污水处理厂二期工程的设计及运行

勒流街道污水处理厂二期工程设计规模为3×104m3/d,采用DE氧化沟为主体的污水工艺。详细介绍了处理工艺流程、主要构筑物的工艺参数及技术特点。从运行数据来看,处理效果较好,出水水质稳定且优于排放标准。     

分时段进水A/O交替运行模式在CAST工艺中的工程应用

东北某污水处理厂二期工程设计规模为5×104 m3/d(深度处理总规模为8×104 m3/d,含一期工程3×104 m3/d一级B出水),进水以市政生活污水为主,污水厂出水水质标准为《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准,设计采用"预处理+CAST工艺+深度处理"工艺,在出水总氮不理想...     

A~2/O氧化沟城镇污水处理厂的设计与运行

文章系统介绍了南方某城镇污水处理厂A2/O氧化沟的工艺设计。其设计总规模为1.2万m3/d,采用A2/O氧化沟工艺,污泥采用机械浓缩和脱水。运行一段时间后的结果表明:A2/O氧化沟工艺处理城镇污水出水水质稳定,可达到《城镇污水处理厂污染物排放标准》(GB18918—2002)中的一级B标准。     

大连开发区污水处理一厂升级改造工程

大连市开发区污水处理一厂原设计规模为7.5×104m3/d,处理工艺为A/O工艺,出水水质执行污水综合排放标准(GB 8978-1996)的二级标准。升级改造工程设计规模增至10×104m3/d,采用改良A2/O工艺,出水水质执行城镇污水处理厂污染物排放标准(GB18918-2002)的一级A标准。介绍了污水处理厂扩容改造的工艺方案选择、工艺流程、设计参数,目前该工程的部分构筑物已投入试运行,出水水质达到一级A标准。     

郑州市某污水处理厂运行分析

郑州市某污水处理厂设计规模5万m3/d,污水二级生化处理采用改良氧化沟工艺。根据进水特点,参考其他运行良好的污水处理厂确定处理工艺及设备,自2016年4月中旬运行以来,污染物去除率较高,主要出水水质指标稳定达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准[1]。     

转盘滤池在污水处理厂深度处理中的应用实践

为提升出水水质,郑州市五龙口污水处理厂(一期)工程在原有工艺的基础上,对原先设计为直接排放的5×104m3/d二级出水增加以转盘滤池为主体的深度处理工艺设施。实际运行结果表明,以转盘滤池为主体的深度处理工艺出水水质超出设计标准城镇污水处理厂污染物排放标准(GB 18918-2002)一级B标准,达到一级A标准,运行效果良好、稳定可靠。     

郑州市某污水处理厂二期工程设计及运行

郑州某污水处理厂二期工程是在原有一期工程基础上的提标和扩建,设计规模为10×104 m3/d,二级处理采用改良A2/O工艺,深度处理采用混凝-沉淀-过滤-消毒工艺。自2010年6月底正式运行以来,运行效果良好、稳定可靠,出水水质达到GB 18918-2002一级A标准,污水厂总处理能力达到20×104 m3/d。     

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.     

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。     

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。     

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…     

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。