Performance of biotrickling filters for hydrogen sulfide removal under starvation and shock loads conditions

In the industrial operation of biotrickling filters for hydrogen sulfide (H₂S) removal, shock loads or starvation was common due to process variations or equipment malfunctions. In this study, effects of starvation and shock loads on the performance of biotrickling filters for H₂S removal were investigated. Four experiments were conducted to evaluate the changes of biomass and viable bacteria numbers in the biotrickling filters during a 24-d starvation. Compared to biomass, viable bacteria numbers decreased significantly during the starvation, especially when airflow was maintained in the absence of spray liquid. During the subsequent re-acclimation, all the bioreactors could resume high removal efficiencies within 4 d regardless of the previous starvation conditions. The results show that the re-acclimation time, in the case of biotrickling filters for H₂S removal, is mainly controlled by viable H₂S oxidizing bacteria numbers. On the other hand, the biotrickling filters can protect against shock loads in inlet fluctuating H₂S concentration after resuming normal operation. When the biotrickling filters were supplied with H₂S at an input of lower than 1700 mg/m³, their removal efficiencies were nearly 98% regardless of previous H₂S input. Project supported by the Foundation for Society Development of Jilin Province (No. 20080412-1), the Education Research Foundation for Science and Technology Development of Jilin Province, and the Foundation for Doctor Research in Northeast Dianli University of Jilin Province (No. BSJXM-200710), China     

单流环密封瓦磨损产生的影响及修复

2009年1月,惠来靖海电厂#1发电机是东方汽轮机有限公司制造的QFSN-655-2-22A型,氢气纯度越来越难以维持,排补氢量较大;密封油主油泵压力低,联起直流备用油泵,无法单泵运行。分析认为是密封瓦间隙过大所引起的,最后决定利用检修的时机,采用机加工的方法修复密封瓦。检修工作取得了预期的效果,机组启动后密封瓦工作正常。     

Monitoring oxidative stress in patients with non-alcoholic and alcoholic liver diseases

Ethanol-induced liver injury may be linked, at least partly, to an oxidative stress resulting from increased free radical production and/or decreased antioxidant defence. Distinguishing alcoholic and non-alcoholic liver disease has important implications. This study looked at the possible changes between alcoholic and non-alcoholic liver diseases by examining the presence of oxidative damage, as monitored by several parameters relating to oxidative stress. Lipid peroxides concentration, superoxide dismutase activity and glutathione S-transferase activity increased, where as glutathione content, glutathione peroxidase activity and glutathione reductase activity decreased among the tested subjects in comparison to normal healthy group. Determination of these parameters may be valuable in the evaluation of liver disease. However, oxidative stress related enzymes and non-enzymes can not be utilized as a marker for alcoholic liver diseases, as these parameters responded in the same way after liver is damaged irrespective of their cause. Their level may help in determining the degree of liver damage. Degree of oxidative injury was similar in patients with non-alcoholic liver disease and in moderate drinkers; while significantly higher in heavy drinkers. The differences between the groups might be based on the type of liver pathological condition rather than its etiology (i.e. alcohol and non alcohol related causes).     

Oxidants and antioxidants in hypoxic ischaemic encephalopathy

In the present study, the role of serum lipid peroxide and serum nitric oxide as oxidants and erythrocytic superoxide dismutase & serum vitamin E as antioxidants were determined in the 50 neonates with hypoxic ischaemic encephalopathy. (HIE) as against 25 healthy neonates as controls 50 patients of HIE were further divided into two groups i. e. mild and moderate HIE patients. All subjects were in the age group of 37–41 weeks of gestation. The levels of serum lipid peroxide, serum nitric oxide and erythrocytic superoxide dismutase were significantly elevated in both groups of neonates with HIE than those of controls (P<0.001), whereas serum vitamin E levels were significantly decreased in both groups of HIE patients than those of controls (P<0.001). A positive correlation was obtained between serum lipid peroxide and erythrocytic superoxide dismutase (r=+0.86). Alterations in the status of oxidants and antioxidants indicate role of free radicals in the development of HIE.     

拟康氏木霉胞外多糖的分离纯化及其对黄瓜幼苗活性氧的诱导

拟康氏木霉胞外粗多糖经纯化得两个单一组分TPeps-1和TPeps-2．用0．25mg／mLTPeps-2处理黄瓜幼苗,处理叶在第一天就产生活性氧爆发,of含量是对照的117．5％;第二天处理中SOD活性达到峰值,为对照的135．5％;用黄瓜灰霉病菌接种黄瓜幼苗也产生了较强的诱导效应,处理叶第一天O2^-含量是对照的139．7％,第二天SOD活性为对照的141．9％;而且两组试验中未处理的系统叶中也存在较弱的诱导反应．结果说明TPeps-2能模拟病原入侵激发黄瓜叶片活性氧代谢途径．     

Biosensor sensitive to hydrogen peroxide via methylene blue incorporated into nafion film as an electron transfer mediator

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｄｅｔｅｃｔｉｏｎａｎｄｑｕａｎｔｉｔａｔｉｖｅｄｅｔｅｒｍｉｎａｔｉｏｎｏｆｈｙｄｒｏｇｅｎｐｅｒｏｘｉｄｅｐｌａｙｓａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｓｅｖｅｒａｌｆｉｅｌｄｓｉｎｃｌｕｄｉｎｇｉｎｄｕｓｔｒｙ,ｂ...     

碳纳米管储氢前后的势场分布研究

研究碳纳米管储氢前后的势场分布及其变化,揭示GCMC方法模拟碳纳米管储氢所得氢气分子形成一定分布的内在原因和碳纳米管吸附储氢过程.     

Hydrogen agronomy: research progress and prospects

Journal of Zhejiang University-SCIENCE B - Agriculture is the foundation of social development. Under the pressure of population growth, natural disasters, environmental pollution, climate change,...     

锂键与氢键的比较

根据实验，对锂键的存在进行了论证，对锂键化合物进行了分类，比较了锂键和氢键的异同。     

异丙醇常压氧化制备过氧化氢反应研究

异丙醇常压氧化制备过氧化氢,操作方便、反应条件温和耳安全可靠.用空气作氧化剂成本低廉.开发出一条新的过氧化氢合成路线,副产重要化工产品丙酮,同时为异丙醇的开发利用找到了新的途径.