乳酸废水处理站改造及运行效果分析

在原有废水处理设施的基础上,对原有水处理工艺进行了改造,强化了预处理过程,采用UASB+CASS工艺处理乳酸生产废水,在进水COD为3 256 mg/L、BOD5为1 320 mg/L、SS和NH3-N的质量浓度分别为635、31 mg/L时,出水水质稳定,COD为98mg/L、BOD5为26mg/L、SS和NH3-N的质量浓度分别为75和22mg/L,达到GB8978-1996表4中规定的二级要求,去除率分别可达到97.0%、98.0%、88.2%和29.05%。该项工程可为类似高含量有机废水的处理提供参考。     

UASB-改良AB工艺处理生物酶制剂废水

某企业产生的生物酶制剂废水具有COD、悬浮物、氮、磷浓度高,水质波动大等特点。采用UASB-改良AB工艺处理,在进水COD、SS、NH3-N和TP的平均浓度分别为21200 mg/L,1780 mg/L,296 mg/L和38 mg/L的情况下,出水COD、SS、NH3-N和TP的平均浓度分别为260 mg/L,32 mg/L,15 mg/L和3.2 mg/L,总去处率分别为98.9%、98%、95.7%和93.8%。     

Fenton氧化与SBMBR组合工艺处理腈纶废水

对腈纶废水进行Fenton氧化预处理后,运用序批式膜生物反应器进行处理。腈纶废水进水COD平均为1259mg/L;NH4 -N质量浓度平均为57.67 mg/L,经过本工艺处理后,最终出水COD平均仅为76.88 mg/L,其去除率平均达93.89%;出水NH4 -N质量浓度平均为2.57 mg/L,其平均去除率95.54%;出水SS、氰化物、硫氰化物、硫化物等有毒有害物质均低于国家排放标准。再用高浓度腈纶聚合废水对本套工艺进行冲击试验,发现对难降解的腈纶聚合废水也具有很好的处理效果,出水的COD与NH4 -N质量浓度平均为160.66 mg/L和3.16 mg/L,去除率平均达91.86%与92.03%。     

超滤膜在城市污水深度处理技术中的研究

本文分析了鄂尔多斯市达拉特旗污水处理厂污水中COD、NH4+-N、TP出水浓度水质特征以及经过MBR工艺处理后进出水浓度变化过程,结果表明:该工艺对COD、NH4+-N的平均去除率分别为94.78%、96.88%;试验平均出水COD浓度为31.42mg/L,NH4+-N浓度为1.99mg/L,均达到了《城镇污水处理厂污染物排放标准(GB18918-2002)》的一级A标准,可见该工艺对城市生活污水的有机污染物和氨氮有很好的去除效果。但是试验对污水中TP的平均去除率只有67.00%,平均出水TP浓度为1.84mg/L,远高于国家城市污水排放标准中的TP的排放限值。     

DAF+MSBR联合法处理煤焦化废水实验研究

为了使焦化废水NH3-N能够达标排放,采用气浮法+改良式序列间歇反应器(DAF+MSBR)联合法处理榆林某焦化厂焦化废水。结果表明,进水CODcr平均质量浓度为1490 mg/L,NH3-N平均质量浓度为200 mg/L,挥发酚平均质量浓度为176 mg/L,CN平均质量浓度为17 mg/L,SS平均质量浓度为580 mg/L,DAF处理时间3 h,MSBR处理时间9 h。经DAF+MSBR法处理后,出水CODcr浓度为74.3 mg/L,NH3-N为10 mg/L,挥发酚为0.25 mg/L,CN为0.09 mg/L,SS为30 mg/L,去除率分别为93.8%、95%、99.8%、99.4%、95%,达到《炼焦化学工业污染物排放标准》排放标准。     

UCT工艺处理生活污水的实验研究

采用气提式UCT工艺处理高氨氮城市生活污水,研究了启动和稳定运行阶段系统对COD、NH⁺_4-N和TP的去除规律。结果表明,经过19 d的启动,对COD和NH+_4-N和TP的去除规律。结果表明,经过19 d的启动,对COD和NH⁺_4-N的平均去除率分别为86.17%和83.04%;稳定运行后,系统对COD、NH+_4-N的平均去除率分别为86.17%和83.04%;稳定运行后,系统对COD、NH⁺_4-N和TP的平均去除率分别为82.94%,97.84%和58.31%,出水平均浓度分别为36,1.9,5.34 mg/L,COD、NH+_4-N和TP的平均去除率分别为82.94%,97.84%和58.31%,出水平均浓度分别为36,1.9,5.34 mg/L,COD、NH⁺_4-N均达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A排放标准。70%的COD在厌氧区和缺氧区被利用,进水中较高浓度的NH+_4-N均达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A排放标准。70%的COD在厌氧区和缺氧区被利用,进水中较高浓度的NH⁺_4-N对COD去除没有影响,好氧区采用大曝气量去除高浓度NH+_4-N对COD去除没有影响,好氧区采用大曝气量去除高浓度NH⁺_4-N,硝化效果较好,NH+_4-N,硝化效果较好,NH⁺_4-N最高去除率为99.73%,基本实现NH+_4-N最高去除率为99.73%,基本实现NH⁺_4-N零排放。在UCT工艺中,高氨氮生活污水有利于缺氧区的反硝化除磷,排泥能显著降低出水TP浓度。     

微电解-AO-臭氧氧化-BAF组合工艺处理制药废水

采用了微电解-AO-臭氧氧化-BAF组合工艺处理制药废水。结果表明,以50%进水稳定运行下,经过组合工艺处理,在进水平均COD在614.1 mg/L、NH_3-N质量浓度在309.2 mg/L时,出水COD平均为115.2 mg/L、NH3-N平均质量浓度在12.8 mg/L,COD和NH_3-N平均去除率分别为81.3%和95.9%,出水水质达到了相关标准的要求。     

氧化偶合絮凝技术强化处理城市污水的动态模拟试验

研究了氧化偶合絮凝技术强化处理城市污水的性能.结果表明,在药剂投加量为14 mg/L,沉淀时间为60min,进水COD、BOD5、TP、SS、NH3-N的平均质量浓度分别为206、113、3.7、134、26 mg/L时,经氧化偶合絮凝强化处理工艺出水CODCr、BOD5、TP、SS、NH3-N的平均质量浓度分别为55、18、0.3、16、12 mg/L,其去除率分别为73.2%、84.4%、92%、89%、55%,处理效果优于一般化学强化一级工艺.     

MBR+NF/RO工艺在垃圾渗滤液处理工程中的应用

着重阐述MBR+NF/RO工艺在垃圾填埋场渗滤液处理实际工程中的应用情况,工程处理能力为200 t/d,在连续进水(进水COD 6 343~8 216 mg/L,NH4+-N质量浓度16 07~2 147 mg/L,TN质量浓度1 809~2 398 mg/L)条件下对渗滤液处理特性进行了研究。稳定运行255 d的工程运行结果表明,MBR+NF/RO工艺抗冲击负荷能力强,COD、NH4+-N、TN的平均去除率分别为99.7%、99.93%、99.7%,并总结运行费用及工程经验。     

UASB+两级接触氧化+混凝沉淀处理豆制品加工废水

介绍了UASB+两级接触氧化+混凝沉淀组合工艺处理豆制品加工废水的工程实例。运行结果表明,该工艺处理效果稳定,出水平均COD、BOD5分别为64、20 mg/L,SS、NH3-N平均质量浓度分别为39、9 mg/L,出水水质达到污水综合排放标准(GB 8978-1996)排放标准一级标准。     

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。