2003版建筑给排水规范学习与设计体会

就新规范中住宅给水管管径、引入管阀门设置、水箱进水管和溢水管设置、水箱水位控制、通气管系统设计及地漏的设置等方面谈了作者学习《建筑给水排水设计规范》(GB50015-2003)的体会。     

活性污泥法处理城市污水中鼓风和纯氧两种曝气方法的比较

对活性污泥法处理城市污水中鼓风曝气和纯氧（或富氧）曝气这两种方法，从曝气设备结构、特点、工艺技术指标、运行管理及经济性等方面进行了分析和比较。     

Effect of aeration on lignin peroxidase production by Streptomyces viridosporus T7A

The effect of aeration on lignin peroxidase production by Streptomyces viridosporus T7A was studied in a bench-scale bioreactor using a previously optimized growth medium (0.65% yeast extract and 0.1% corn oil, pH7.0) at 37°C and natural pH. Airflow rates of 0.3, 1.0, and 1.5 vvm and a fixed agitation of 200 rpm were initially studied followed by 1.0 vvm and 200, 300, 400, and 500 rpm. The use of 1.0 vvm and 400 rpm increased enzyme concentration 1.8-fold (100–180 U/L) and process productivity 4.8-fold (1.4–6.7 U/[L·h]) in comparison with the use of 200 rpm and 0.3 vvm. The inexpensive corn oil, used as carbon source, besides its antifoam properties, proved to be nonrepressive for enzyme production.     

断续喷洒去溶电热雾化法在电感耦合等离子体原子发射光谱方法中的应用研究

本文所讨论的电热雾化法是采用继续喷洒去溶技术,使试样在石墨炉表面逐步积累的进样方法。文章简要介绍了实验条件的选择和控制以及石墨炉装置的结构,探讨了提高电热雾化法相对检测能力的途径。实验结果表明:谱线黑度值与试样积累时间的对数值之间具有较好的线性关系。     

Integral conditions on the asymptotic stability for the damped linear oscillator with small damping

The equation is considered under the assumption . It is proved that is sufficient for the asymptotic stability of , and is best possible here. This will be a consequence of a general result on the intermittent damping, which means that is controlled only on a sequence of non-overlapping intervals.

     

Maximizing the xylitol production from sugar cane bagasse hydrolysate by controlling the aeration rate

Batch fermentations of sugar cane bagasse hemicellulosic hydrolysate treated for removing the inhibitors of the fermentation were performed byCandida guilliermondii FTI20037 for xylitol production. The fermentative parameters agitation and aeration rate were studied aiming the maximization of xylitol production from this agroindustrial residue. The maximal xylitol volumetric productivity (0.87 g/L h) and yield (0.67 g/g) were attained at 400/min and 0.45 v.v.m. (K_La 27/h). According to the results, a suitable control of the oxygen input permitting the xylitol formation from sugar cane bagasse hydrolysate is required for the development of an efficient fermentation process for large-scale applications.     

断续流动-氢化物发生原子荧光法测定浓缩苹果汁中的砷

用断续流动－氢化物发生原子荧光法测定了浓缩萍果汁中的砷含量。确定了仪器的最佳条件，探讨了酸介质，硫脲－抗坏血酸用量，硼氢化钾加入量对测定As的影响。在选定的操作条件下，砷的检限为0．43ng/mL，相对标准偏差为3．4％－6．3％，加标回收率为94．0％－101．5％本方法简便，快速，灵敏，准确，应用于浓缩苹果汁中As的测定，得到满意的结果。     

Bench Scale Studies of the Soil Aeration Process for Bioremediation of Petroleum Hydrocarbons

An alternative to traditional hydrocarbon bioremediation is to pump air through unsaturated soils to create aerobic conditions and induce biodegradation. This study examines the effects of moisture and nutrient augmentation on biodegradation of petroleum hydrocarbons in aerated soils. Findings indicate that forced aeration, coupled with additions of nutrients and moisture, stimulate hydrocarbon-degrading microorganisms and present a feasible approach to bioremediation management.     

三种曝气器在染料化工废水中充氧能力的比较

以某染料化工废水为试验对象 ,选择了三种不同规格型号的微孔曝气器 ,分析比较了其在不同工况条件下的供氧能力、氧利用率和需气量 ,并根据试验结果对该化工废水处理站的供氧系统作了综合评估 .评估结果对废水处理中曝气器的合理选用和供氧系统的正确评估具有参考意义     

制革污泥机械堆肥技术的研究

利用机械强制通风对制革污泥进行堆肥试验;试验结果表明:采用强制通风堆肥技术可使污泥堆肥30d内基本达到腐熟,温度、通气完全满足要求,堆肥结束后,其中有机质、N等养分含量均能达到堆肥的成品要求。