厌氧/好氧/生物脱氨工艺处理煤化工废水

采用厌氧/好氧/生物脱氨/混凝沉淀工艺处理煤化工废水,设计总处理量为360m3/h。4个多月的调试运行结果表明,该工艺运行稳定,耐冲击负荷能力强,当进水平均COD为2 141 mg/L、总酚为391 mg/L、氨氮为92 mg/L时,处理后出水COD<100 mg/L、总酚<10 mg/L、氨氮<15 mg/L,出水水质达到《污水综合排放标准》(GB 8978—1996)的一级标准。

传统生物除磷脱氮工艺和反硝化除磷工艺对比

介绍了传统生物除磷脱氮和反硝化除磷的机理,比较了几个有代表性的传统除磷脱氮工艺和反硝化除磷工艺。通过分析认为反硝化除磷菌(DPB)能够以硝态氮为电子受体,从而大大节省耗氧量,缓解常规工艺对外加碳源的需求。如何在不增加工艺流程复杂性的同时,在工艺中充分富集DPB是反硝化除磷的关键。

循序间歇式脱氮工艺去除焦化废水中氨氮的研究

针对现有焦化废水中ＮＨ＿３－Ｎ严重超标问题．研究了循序间歇式工艺（ＳＢＲ法）对焦化废水中氨氮的去除．通过对硝化菌、反硝化菌的驯化、ｐＨ值调节、曝气方式影响因素的考察．表明该工艺对焦化废水中氨氮处理具有显著效果，处理后废水的出水ＮＨ＿３－Ｎ浓度为４．６ ｍｇ／Ｌ．脱氨率为９８％．

ASM1模型在大型城市污水处理厂的应用

文中应用GPS-X模拟软件的活性污泥ASM1建立一个大型污水处理厂的模拟模型,以更好地理解生物处理过程;寻求改善和优化污水处理厂脱氮方案。利用已有污水处理厂的设计和日常运行监测数据进行模型校准和验证,避免了在模拟大型污水处理厂的前期进行大量的专门研究工作。最后,使用经校准和验证过的模型对改善污水处理厂的脱氮性能进行了初步探讨。

Expression of Recombinant Tryptophan Decarboxylase in Different Subcellular Compartments in Tobacco Plant

The gene encoded for tryptophan decarboxylase (TDC), which is the key enzyme in terpenoil indole alkaloids pathway, was targeted to different subcellular compartments and stably expressed in transgenic tobacco (Nicotiana tabacum L.) plants at the levels detected by Western blot and tryptamine accumulation analysis. It was shown that the TDC was located in subcellular compartments, the chloroplasts and cytosol. The recombinant TDC targeted to chloroplasts and cytosol in tobacco plants was effectively expressed as soluble protein by Western blot analysis and enzymatic assay. The level of tryptamine accumulation in chloroplast was higher than that in cytosol and very low in vacuole and endoplasmic reticulum (ER) to be hardly detected by Western blot analysis. It was indicated that the highest amount of tryptamine was in chloroplasts, lower in endoplasmic reticula and the lowest in vacuoles as compared to those in wild type plants. The TDC targeted to different subcellular compartments of tobacco plants and its expression level were studied by different nucleotide sequences coding signal peptides at 5'-end of tdc gene in order to know the effects of the TDC in compartmentation on its functionality.

Eucaryotic DNA Methylation and Gene Mutation

5-methylcytosine (m5C) as a rare base exists in eucaryotic genomes, it is a normal constituent of many eucaryotic DNA, whose existence is a character of eucaryotic DNA. In the regular physiological conditions, cytosine residue of eucaryotic DNA is methylated to be popular. Up to the present, many people consider that the m5C may be mutation hotspots by the m5C deamination leading to gene mutation. Our theoretical investigations indicated that the spontaneous mutation caused by the transition of G - C-A - T, in eukaryotic DNA, may be a result caused by the tautomer changing base pairs and may also be caused by other factor actions, however it could not be caused by the deamination of m5C.

粒径控制对好氧颗粒污泥处理高含氮废水的影响

采用序批式反应器（SBR）,以不同的缺氧搅拌时长来控制颗粒污泥粒径,探究不同粒径的好氧颗粒污泥系统对高浓度氨氮废水的处理特性。研究表明不同控制策略下的4个反应器（R1~R4）分别得到的主要粒径分布为0.4~0.6,0.6~0.8,0.6~0.8,1.0~1.2 mm;系统稳定阶段氨氮平均去除率分别为83.6%、79.4%、77.7%和73.1%。此外,好氧颗粒污泥系统处理高氨氮废水时,颗粒粒径最小的反应器（R1）在氨氮、总氮和磷酸盐方面具有较好的去除效果,但其颗粒污泥的物化性能并没有体现出较高优势。