以IBAC为核心处理洗浴废水的试验研究

根据洗浴废水的水质特征,采用原水→混凝沉淀-过滤→固定化生物活性炭(Immobilized Biological Activated Carbon,IBAC)→微滤膜(MF)→UV消毒→出水的工艺流程.混凝沉淀-过滤物化预处理单元可以有效地减少洗浴废水中的各类污染物.IBAC生化处理单元,实现有机污染物、LAS、浴臭等有效去除,是保证出水合格的根本措施.微滤膜发挥物理截留作用、UV消毒杀死细菌和总大肠菌群.出水水质达到＜城市供水水质标准＞(CJ/T 206-2005).     

The Effect of Ozone Gas-Liquid Contacting Conditions in a Static Mixer on Microorganism Reduction

The effect of gas-liquid contacting conditions in a static mixer on ozone transfer efficiency and reduction of Bacillus subtilis spores was studied in an experimental ozone contactor. An empirical mathematical model was developed that related the transfer efficiency in the experimental system to the superficial liquid velocity in the mixer, the gas-liquid flow rate ratio and the height of the down-stream bubble column. Spore reduction was determined primarily by the dissolved ozone concentration-time (C_avgt_m) product in the reactive flow segment and was independent of the gas-liquid contacting conditions in the static mixer. In an integrated ozone contacting system, the static mixer should be designed to maximize ozone mass transfer while the reactive flow segment should be designed for efficient microorganism reduction.     

分子生物技术在石油降解微生物研究中的应用

总结了生物法治理石油污染的局限性,介绍了几种在石油降解微生物研究中广泛应用的分子生物技术,并对该研究领域未来的发展趋势进行了预测。     

浸没式超滤膜工艺应用中几个问题及调整

北京地区3座采用浸没式超滤膜工艺的净水厂在实际运行过程中出现了一些影响工艺运行的现象和问题,其中膜丝材料老化、膜孔变形甚至断丝等现象加剧了初滤水现象,并对出水水质产生了不利影响;膜池污染物富集则一定程度上加剧了膜污染和膜丝间积泥,导致膜组件断丝现象加剧及清洗困难。对于运行而言,低温造成的反冲洗压差增加比产水过程的通量下降和跨膜压差增加的影响更为直接和难以克服。此外,实际运行过程的膜出水中有相当数量的微生物检出,表明仍存在着生物泄漏的风险。     

PHB在生产可降解塑料方面的应用及其微生物累积的研究进展

着重介绍了聚β-羟基丁酸（PHB）的一些性质、用途以及在生产可降解塑料方面的应用情况，同时也介绍了微生物累积PHB的情况，并对微生物累积PHB以及PHB的研究发展提出了一点建议。     

Evaluation the quality characteristics of wheat flour and shelf-life of fresh noodles as affected by ozone treatment

In this study, the effects of ozone treatment on the microorganism mortality in wheat flour and shelf-life of fresh noodles were investigated, as well as the physicochemical properties of wheat flour and textural qualities of cooked noodles. Results showed that the total plate count (TPC) can be largely reduced in wheat flour exposed to ozone gas for 30 min and 60 min. Whiteness of flour and noodle sheet, dough stability, and peak viscosity of wheat starch were all increased by ozone treatment. Free cysteine content in wheat flour was shown to decrease significantly (P < 0.05) as the treatment time increased and remarkable protein aggregates were observed in both reduced and non-reduced SDS–PAGE patterns. In addition, ozone treated noodles were generally higher in firmness, springiness, and chewiness, while lower in adhesiveness. Microbial growth and darkening rate of fresh noodles made from ozone treated flour were delayed significantly.     

微生物源凝乳酶的研究进展

本文简要介绍了凝乳酶的一般特性和凝乳机理 ,综述了微生物源凝乳酶的研究进展和利用基因工程生产凝乳酶的发展状况 ,最后对凝乳酶的生产与开发进行了展望     

Transition metal nanoparticles doped carbon paper as a cost-effective anode in a microbial fuel cell powered by pure and mixed biocatalyst cultures

The poor wettability and high cost of the carbonaceous electrodes materials prohibited the practical applications of microbial fuel cells (MFCs) on large scale. Here, a novel nanoparticles of metal sheathed with metal oxide is electrodeposited on carbon paper (CP) to introduce as high-performance anodes of microbial fuel cell (MFC). This thin layer of metal/metal oxide significantly enhance the microbial adhesion, the wettability of the anode surface and decrease the electron transfer resistance. The investigation of the modified CP anodes in an air-cathode MFCs fed by various biocatalyst cultures shows a significant improving in the MFC performance. Where, the generated power and current density was 140% and 210% higher as compared to the pristine CP. Mixed culture of exoelectrogenic microorganism in wastewater exhibited good performance and generated higher power and current density compared to yeast as pure culture. The excellent capacitance with a distinctive nanostructure morphology of the modified-CP open an avenues for practical applications of MFCs.     

造纸系统的微生物腐蚀

介绍了造纸行业中微生物腐蚀的危害，分析了微生物腐蚀的机理，然后从造纸行业当前状况提出了防止微生物腐蚀的防护措施。     

同位素稀释分析在土壤氮素循环利用研究中的应用

同位素稀释分析是研究氮素在土壤植物体系中转化和迁移特征的有效方法。本文对国内外近十年利用同位素稀释技术研究土壤微生物和植物对不同形态的氮素的利用与竞争进行了总结,强调了土壤在植物和微生物养分利用中的双重作用。利用同位素稀释分析还可以研究所施氮肥的转化、迁移、和流失,推断土壤-植物系统N肥平衡状况,对提高肥料利用率,科学施肥,减少氮素污染有着科学的指导作用。