自备发电站噪声综合控制

本文对自备发电站噪声污染综合控制进行了论述，拟出了有效控制措施。通过工程实例证明，自备发电站噪声污染扰民问题，能够得到有效的控制和解决。     

Isolation, identification and arsenic-resistance of Acidithiobacillus ferrooxidans HX3 producing schwertmannite

Schwertmannite, a ubiquitous mineral present in iron oxyhydroxides formed in iron- and sulfate-rich acid media, favors incorporation of some toxic anions in its structure. We reported an iron-oxidizing bacterial strain HX3 from a municipal sludge that facilitates the formation of pure schwertmannite in cultures. Ferrous iron oxidation by the isolated strain HX3 was optimum at an initial pH of 2.0-3.3 and temperature of 28-35°C. Pure schwertmannite was found through bacterial oxidation of ferrous iron at an initial pH 2.8and temperature 28°C. Following 16 S rDNA gene sequence analysis the bacterial strain HX3 was identified as Acidithiobacillus ferrooxidans. The arsenic-resistance A. ferrooxidans HX3 showed the potential of environmental application in arsenic removal from the As（Ⅲ）- and iron-rich acid sulfate waters directly by As（Ⅲ） adsorption or the formation of schwertmannite in the environment.     

建筑结构减震控制新体系——减轻城市地震灾害的有效途径

本文提出一种崭新的,更加安全、有效、简单、经济,且能适用于不同地震烈度区的结构减震控制体系,包括结构隔震体系,结构消能减震体系,被动和主动减震控制体系,并介绍这种新体系的减震机理、构造方案、试验成果、减震动力理论分析,以及在国内外的最新研究发展和应用情况,包括作者在该领域所取得的最新试验研究、理论和工程应用成果,并以减轻城市地震灾害为目标,探讨了抗震结构今后的发展方向。     

氧化亚铁硫杆菌的分离及生长特性研究

从酸性矿坑水中分离得到3株细菌S1、S2和S3,经16S rRNA序列分析,S3为氧化亚铁硫杆菌(Thiobacillusferrooxidans)。对S3菌,选取初始Fe2+浓度和初始pH值为影响因子,设计正交试验,通过测定培养过程中pH值、氧化还原电位Eh、Fe2+浓度和总Fe浓度的变化,并计算Fe2+氧化速率,研究初始Fe2+浓度和初始pH值对细菌生长的影响。     

Emergency evacuation model assuming leakage of toxic substances in a chemical plant

Preparedness of emergency evacuation for the leakage of toxic substances in chemical plants is very important in order to reduce damage. In order to implement an emergency evacuation properly, it is necessary to comprehensively and concretely determine the conditions of the leakage and atmospheric conditions and predict the consequences of the dispersed gases. Repeated training for emergencies is also essential. In order to realize effective evacuation, a prediction model of the evacuation area that anyone can use to obtain the same results both accurately and promptly is developed in the present study. The prediction model is designed such that the wind speed and atmospheric conditions are automatically set, and the leakage rate is the only input parameter, so that anyone can use the model easily. In addition, the model can also predict the atmospheric parameters for up to 3 h and can calculate the evacuation distance so that smooth evacuation can be achieved for changing atmospheric conditions. Finally, the evacuation area is defined by statistically analysed wind fluctuations, and a series of emergency evacuation measures is implemented.     

亚硝酸盐降解菌的分离鉴定及其降解特性

从活性污泥中分离得到一株能以亚硝酸盐为唯一氮源生长的异养硝化细菌53,根据其形态、生理生化特性以及16S rRNA基因序列相似性分析结果,将其初步鉴定为假单胞菌属(Pseudomonas sp.)。研究了亚硝酸盐的初始浓度、pH、温度、接种量4个影响因素对菌株53降解亚硝酸盐效果的影响,确定了最适降解条件。结果表明,该菌株在亚硝酸盐浓度10 mg/L、培养温度30℃、pH为8.0、接种量5%条件下,接种24 h后对亚硝酸盐的降解率达到94.8%以上。在亚硝酸盐质量浓度为5mg/L的10L污染水体模拟实验中,按1%的接种量接入53发酵菌液(A600nm≈0.4),在30℃的水温条件下经4 d,53菌株对亚硝酸的降解率可达96.52%,处理后水体中亚硝酸盐的含量能达到养殖水体标准。表明该菌株对污染水体中的亚硝酸盐具有较强的降解效果。     

生物转鼓过滤器中一株好氧反硝化菌的分离鉴定与降解特性研究

从稳定运行处理NO废气的生物转鼓过滤器中筛选分离到1株好氧反硝化细菌DN3,发现该菌在好氧条件下能有效去除培养液中的硝酸根,培养28h后的反硝化率大于80%.扫描电镜结果显示,菌株DN3为短杆菌,带有鞭毛,大小为(0.4～0.8)μm ×(2.0～2.5)μm,菌落表面呈现乳白色.通过生理生化特性及16S rRNA基因...     

Dynamic response characteristics and structural optimization of isolation seal under the impact of gas explosion

Either in the chemical process plants or in the underground infrastructures, the isolation seal is regularly used to separate the working sections and inactive sections, or to isolate the possible explosion sites in order to avoid any domino effects. Due to differences in accumulation space or ignition point locations, pressure on the seal can vary when an explosion occurs. Thus, the safety and reliability of seals are crucial to maintaining safety in process industry. This paper focuses on seals constructed with concrete and loess materials, and examines the dynamic response characteristics of the gas explosion wave on the seal through sample experiments and numerical simulation metods. The study proposes an optimized design for the explosion-proof structure of the wedge-shaped and spherical seal, which can provide a technical basis for the explosion-proof and anti-explosion measures of various sealed walls. These research findings can also serve as a basis for improving the construction quality of seals.     

微生物絮凝剂产絮菌的分离与筛选

根据北方气温的变化特点,用活性污泥生物膜分离、筛选出DG1、DN1、H8、H13菌株,在低温条件下培养絮凝率分别达到87.35%、81.33%、83.79%、78.44%,为今后开展低温污水处理及絮凝机理的研究打下了基础。