共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
均酸废水处理的工程实践 总被引:1,自引:0,他引:1
酸性高,CODCr浓度高的均酸废水通过与生铁屑反应及碱中和沉淀的预处理,CODCr去除率大于60%,m(BOD5)∶m(CODCr)由处理前0.15提高到0.50。预处理后的废水再与其它低浓度废水混合,经好氧生化处理,排放废水的CODCr为95mg/L、BOD5为23mg/L。 相似文献
4.
5.
6.
7.
萘胺废水具有CODCr浓度高、酚浓度高的特点。采用Fe-C微电解工艺对其进行预处理,CODCr去除率大于30%,酚去除率大于60%,m(BOD5):m(CODCr)从0.11提高0.32。预处理后的废水经二级生化处理,在混合废水CODCr、BOD5、挥发酚的质量浓度分别为1 548、496、59 mg/L时,处理后出水分别为112、15、0.2 mg/L,出水水质达到G8 8978-1996《污水综合排放标准》之二级标准。 相似文献
8.
9.
气浮—ABR—生物接触氧化处理乳制品废水 总被引:1,自引:0,他引:1
采用气浮—ABR—生物接触氧化工艺处理乳制品废水。在进水CODCr为1 400 mg/L、BOD5为840 mg/L、SS为500 mg/L和pH=4.5的条件下,CODCr和BOD5的去除率分别达到95%和98%。出水CODCr、BOD5、SS和pH均达到《污水综合排放标准》(GB 8978—1996)一级排放要求。 相似文献
10.
本文论述二段生物接触氧化法处理香精污水的经济合理工艺 ,生产性实验结果表明 :在一氧接触时间t1=8hrs左右 ,二氧接触时间t2 =3hrs左右 ,水气比r=1∶2 4左右 ,初、二沉淀时间t3 =44 =1.5hrs左右 ,气浮时间t5=1.0hr左右和BOD有机负荷 3 0 0— 3 18,处理后的香精污水可达到国家二级排放标准 (GB8978— 1996 )。CODCr去除率达到 93%~ 95 % ,BOD5去除率达到 88%~ 91% ,SS去除率达到 86 %~ 90 % 相似文献
11.
12.
13.
Dinesh Singh J. K. Gehlawat Musti S. Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,47(2):127-136
Oslefins and diolefins are important intermediates in the petrochemical industry and the future promises a further substantial increase in demand. While several catalysts have been formulated in the past for the abstraction of hydrogen from butenes and propylene, these catalysts are inefficient in the abstraction of first hydrogen from butane. Bismuth molybdates (β and γ-phases) containing iron oxide and supported on alumina are used as catalysts in the present investigation on the oxidative dehydrogenation of n-butane. Effects of catalyst content, temperature and oxygen: n-butane ratio on conversion and selectivity to butadiene and (C4H8 + C4H6) are studied in the following ranges of experimental conditions: β-bismuth molybdate/100 mol support I(K), 3–9; γ-bismuth molybdate/100 mol support I(K), 5-20; temperature, 400–500°C; O2: butane ratio, 0.6:1.7. 相似文献
14.
考登钢作为一种高耐候结构钢,广泛应用于各个领域。在火力发电方面,考登钢主要应用在工作环境比较恶劣的烟气加热器和空气预热器中。考登钢表面涂搪的目的就是进一步提高其耐腐蚀性能,延长使用寿命。为了提高考登钢元件的使用寿命,对考登钢表面涂搪瓷的可行性、密着性能、瓷釉、工艺控制、质量保证等方面进行了研究。 相似文献
15.
A viscometer used to measure the viscosity of 10 μl of a liquid, must be miniaturized down, and the liquid velocity gradient in the channel used to determine the viscosity coefficient. Two major factors that affect the liquid velocity are the mechanical forces exerted by the mechanical motors and electromagnetic forces. In this study, electrowetting on dielectric (EWOD) is adopted to drive liquids. Variously sized electrodes on a chip, and two shapes of channel are employed to measure the velocity gradient to determine the viscosity coefficient. The device is fabricated by microelectromechanical system (MEMS) technology. The dielectric layer used in EWOD has a high dielectric constant, BST (Ba0.7Sr0.3TiO3), to reduce the required applied voltage; its surface is coated with hydrophobic polymer, polytetrafluoro-ethylene (PTFE, Teflon® AF DuPont). Experimental results demonstrate that liquids can be pulled at 660 μm/s in linear channels by applying a voltage of 15 V. 相似文献
16.
研究了温度和pH值对漆酶酶活以及漆酶处理纤维压制纤维板性能的影响。结果表明,pH较低、温度较高时漆酶酶活较高,压制的纤维板强度性能较好。但温度太高(60~80℃),延长加热时间,漆酶稳定性变差,酶活明显降低,压制纤维板的强度下降。 相似文献
17.
In reexamining medium effects on photochemical reactions, we have emphasized those on unequilibrated excited species such as the Franck-Condon species. Despite recent advances in femtochemistry, such a discussion in molecular photochemistry is uncommon, and the problem remains challenging on account of the extremely short-lived excited species. However, in such cases, a small perturbation resulting from, for example, weak guest-host interactions could turn into a determining factor in dictating the course of a photochemical channel of deactivation. Examples of medium-directed diabatic processes have been examined with this idea in mind. A modified view on rhodopsin photoisomerization is presented along with the consideration that confinement does not necessarily lead to inhibition of reactions of the trapped substrate. 相似文献
18.
19.
20.
采用实验方法考察工艺参数对沉降斑的影响。基于一个带凸台的平板模具,采用L27(313)正交矩阵进行实验,研究了几何尺寸、熔体温度、注射时间、保压压力及保压时间对厚度突变处沉降斑形成的影响,同时还考虑了熔体温度和注射时间以及保压压力和注射时间之间的交互作用影响;通过性噪比分析和F检验优化成型工艺条件并对工艺参数的影响进行显著性分析。结果表明,对于厚度突变的平板制品,厚度突变的程度对其沉降斑形成的影响最大,其次为熔体温度,保压压力,保压时间等;采取减小厚度变化,降低熔体温度或增加保压压力和保压时间等措施,可以减小厚度突变处沉降斑,从而减少其对外观质量的影响;因素之间的交互作用对制品沉降斑的形成有一定的影响,熔体温度B和注射时间C之间的交互作用影响较为明显,而保压压力D和注射时间C之间的交互作用对该质量指标的影响最小,可以并入误差。 相似文献