曝气生物滤池-臭氧氧化-曝气生物滤池组合工艺对印染废水的深度处理

采用曝气生物滤池(BAF)-臭氧氧化-曝气生物滤池三段组合工艺对二级生化后的印染废水进行深度处理,进水COD为90～150 mg/L,色度为16-32倍,经该工艺处理后的出水COD<35 mg/L,去除率>75%,色度降到4倍以下.工程运行实践表明,该深度处理系统运行稳定,处理效率高,出水水质达到印染场洗水工序对水质的要求.     

臭氧-曝气生物滤池工艺深度处理石化废水

采用臭氧-曝气生物滤池(BAF)工艺对广东某石化废水经一般生化处理后进行深度处理,以提高废水的可生化性,探讨了废水的初始pH、臭氧投加量和催化剂等因素对臭氧氧化的影响,以及曝气生物滤池不同停留时间对废水COD去除率的影响。结果表明,进水COD约60~80 mg/L,臭氧投加量55.56 mg/L,BAF水力停留时间1.5 h,经组合工艺处理后出水COD低于30 mg/L,达到中水回用标准。     

造纸废水臭氧-曝气生物滤池深度处理技术研究

研究了臭氧-曝气生物滤池工艺对造纸废水二级生化出水的深度处理.结果表明,臭氧预氧化能将难降解的大分子有机物分解成小分子有机物,废水的可生化性得到了显著提高,B/C由0.21提高到0.45.臭氧-曝气生物滤池联合工艺对各种污染物都有很好的去除效果,COD、浊度主要是通过臭氧单元和BAF单元的共同作用去除,氨氮的去除主要是通过BAF单元的生物硝化作用,而UV254、色度的降解则是臭氧起主导作用.经深度处理后,出水可达到新颁布的制浆造纸工业水污染物排放标准.     

臭氧催化氧化-曝气生物滤池工艺对印染废水的深度处理研究

采用臭氧催化氧化-曝气生物滤池工艺对印染废水进行深度处理。在室温条件下,试验水样体积为2000 mL,分别使用负载催化剂的陶粒和普通陶粒进行臭氧氧化实验。在通O3时间为15 min,臭氧的投加量达90 mg/L时,废水COD由125 mg/L下降到62 mg/L,去除率达到51%。废水水样中含较多难生物降解的有机物,经过臭氧催化氧化预处理之后,废水的可生化性得到改善。催化陶粒相对于普通陶粒表现出了更加良好的催化效果。采用臭氧催化氧化-曝气生物滤池工艺深度处理印染废水,COD的去除率达到66%,处理效果良好。     

Fenton试剂-曝气生物滤池处理酸性玫瑰红印染废水

根据酸性玫瑰红印染废水高色度、难生物降解的特点,提出了Fenton试剂-曝气生物滤池(BAF)的组合工艺.该组合工艺是采用Fenton试剂进行氧化预处理,去除色度和部分有机物,提高废水的可生化性,再通过后续的BAF工艺去除大部分有机物.实验结果表明,在原水色度为2 000度、CODCr为140～160 mg/L的情况下.最终出水的色度低于20度、CODCr低于20 mg/L,达到中水回用标准.     

Fenton氧化-BAF联合工艺深度处理印染废水二级出水的研究

根据印染废水二级出水高色度、难生物降解的特点,提出了Fenton氧化-曝气生物滤池(BAF)的深度联合处理工艺。该组合工艺是采用Fenton试剂进行氧化预处理,去除色度和部分有机物,提高废水的可生化性,再通过后续的BAF工艺去除大部分有机物。结果表明,在二级出水色度为1000,COD为250 mg/L,最终出水的色度低于20倍,COD低于50 mg/L,达到中水回用标准。     

乙烯废水深度处理达标技术研究与应用

针对齐鲁乙烯废水高钙高盐、可生化性差的特点,通过小试、中试和A/O侧线试验,确定了污污分流、分质处理达标总体改造方案.工业应用和标定结果表明,采用预处理-水解酸化-纯氧曝气-接触氧化-曝气生物滤池(BAF)的工艺处理高盐废水;采用顸处理-A/O内循环-砂滤的工艺处理低盐废水,处理后高、低盐废水都可以达到p(CODCr)...     

H-O-BAF生物组合工艺处理皮革废水

采用水解酸化-生物接触氧化-上向流生物曝气滤池(H-O-BAF)组合工艺对皮革废水进行生物处理实验.分析了皮革废水水质和可生化性.研究了溶解氧质量浓度(DO)和水力停留时间(HRT)对该工艺处理效果的影响.该工艺处理皮革废水合适的HRT为:水解酸化10 h,生物接触氧化6 h,生物曝气滤池3 h左右.在合适的操作条件下该工艺对皮革废水COD、色度和总铬的去除率分别达到72.8%、80.0%和66.6%,处理出水水质达到排放标准.     

某工业园污水处理厂工程设计

某工业园污水处理厂主要处理焦化废水,针对废水水质可生化性差,NH3-N含量高,碳源不足等特点,采用硝化NH3-N及氧化碳源的好氧曝气生物滤池BAF(C/N)与将硝态氮还原成氮气的缺氧曝气生物滤池BAF(DN)的二级组合工艺。工程运行结果表明,出水CODCr和NH3-N的质量浓度分别为11.70和0.63 mg/L,达到了GB 18918—2002《城镇污水处理厂污染物排放标准》中一级A标准的要求。     

曝气生物滤池处理腈纶废水的启动性能研究

以曝气生物滤池(Biological Aerated Filter,BAF)净化腈纶废水为研究对象,研究了BAF处理腈纶废水的启动规律。试验以陶粒为滤料,在流量为25L/h,曝气量为40L/h的试验条件下,每天测试COD和氨氮的去除率变化情况。BAF对COD,氨氮有一定的去除效果。启动15d后,COD去除率达到65%;18d后,氨氮去除率达到60%以上。镜检表明,填料表面生物膜中均存在着多种微生物和明显的生物相分布。BAF挂膜过程中可以通过氨氮和COD去除率变化,来判断填料挂膜的进程和生物硝化作用进行的程度。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

三种煤样燃烧热的测定

本文通过三个厂家提供的三种煤样燃烧热的测定,由测定结果综合得出3号煤样燃烧最完全、燃烧热也最大,是三个煤样中最好的一种。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

小议汽车涂装工艺设计对涂装成本的影响

论述了涂装工艺设计对涂装设备投资、涂装生产成本的影响。     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

Measurement of the gradient of viscosity with composition of mixtures of non-ideal gases

A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%.     

塔设备改造选型的分析

就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后，着重介绍一种新型塔板（导向梯形浮阀塔板）和一种新型填料（波环填料——乾隆帕克）。     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

Effect of degree of deacetylation of chitin on the properties of chitin crystallites

In the present article, chitin from crab shell was systematically deacetylated using a NaOH treatment with control of the reaction time. The degree of deacetylation, monitored using solid-state NMR, revealed that the reaction was pseudo-first order. Based on this, swollen and NaOH-saturated particles are proposed as the reaction system. The weight loss of the partially saponified and neutralized samples after HCl hydrolysis increased linearly with the degree of deacetylation. The crystallinity of the samples was found to increase after acid hydrolysis. According to conductimetric titration, the surface charge density of the crystallites, after acid hydrolysis, was found to increase with base treatment time. The effect of surface charge on the formation of a chiral nematic phase, due to the rodlike nature of the crystallites, was explored. These results show that because the contribution of charged particles to the ionic strength was significant the double layer compression was affected, especially since the surface charge density was close to the Manning limit. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:373–380, 1997