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详细介绍了污水处理厂的设计规模、SDAO污水处理工艺、各个单体构筑物的主要设计参数,SDAO工艺采用圆形曝气池,在工艺和结构设计上有所创新。污泥采用消化处理,污泥加热方式比较科学。 相似文献
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分别利用Langmuir、Freundlich和Fritz-Schlunder三种等温吸附平衡关系,对粒内表面扩散控制时的搅拌槽液相吸附动力学过程进行数学模拟研究,同时指出日本《化学工学便览》第四版和第五版中关于求取粒内表面扩散系数部分内容所存在的问题。若按上述《便览》中的公式或图去求粒内有效表面扩散系数Ds,则其平均误差将可能达到340%左右,这是因为铃木基之和河添帮太朗等人在利用“单点拟合法”确定有效表面扩散系数Ds时,错误地将无因次吸附时间等于1.0视为吸附平衡时间所致。文中还对《便览》中存在的上述问题提出了相应的修正意见 相似文献
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Fire accidents of chemical installations may cause domino effects in atmospheric tank farms, where a large amount of hazardous substances are stored or processed. Pool fire is a major form of fire accidents, and the thermal radiation from pool fire is the primary hazard of domino accidents. The coupling of multiple pool fires is a realistic and important accident phenomenon that enhances the propagation of domino accidents. However, previous research has mostly focused on the escalation of domino accidents induced by a single pool fire. To overcome the drawback, in this study, the failure of a storage tank under the coupling effect of multiple pool fires was studied in view of spatial and temporal synergistic process. The historical accident statistics indicated that the accident scenario of two-pool fires accounted for 30.6% in pool fires. The domino accident scenario involving three tanks is analyzed, and the typical layout of tanks is isosceles right triangle based on Chinese standard “GB50341-2014”. The thermal response and damage of a target tank heated by pool fires were numerically investigated. The volume of 500 m3, 3000 m3, 5000 m3 and 10000 m3 were selected. Flame temperature was obtained by FDS, and then was input onto the finite element model. The temperature field and stress field of target tanks were simulated by ABAQUS. The results showed that the temperature rise rate of the target tanks under multiple pool fires was higher than that under a single pool fire. The failure time of the tank under the coupling effect of multiple fires was lower than that under the superposition of multiple fires without the first stage. The stress and yield strength were compared to judge the failure of the target tank. The model of failure time for the tank under the coupling effect of pool fires was established. Through the verification, the deviation of this model is 4.02%, which is better than the deviation of 15.76% with Cozzani's model. 相似文献
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This study presents a quantitative analysis and interpretation of the variation in oil tank fire flame lengths for different oil tank sizes, top cover widths, and horizontal air flow velocities. The experimental results show that, at first, the flame length rises slowly with an increase in air flow speed. Then, once over a critical speed (0.6 m/s), the flame length decreases significantly with a further increase in air flow speed. Based on the characteristic length, a new dimensionless heat release rate is obtained, allowing the correlation between flame length, air flow speed, and dimensionless heat release rate to be calculated, which can be used to predict the flame length of an oil tank fire under different air flow speeds, lip heights, and cover widths. 相似文献
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SBR法处理化粪池出水的工艺研究 总被引:3,自引:1,他引:3
采用经实验运行得到SBR工艺处理化粪池出水的合理的操作模式,能获得90%以上稳定的COD_(cr)去除率及更好的BOD_5去除效果,NH_3-N去除率大于75%,TN去除率大于45%.并考察了污泥浓度、泥龄、污泥负荷与处理效果的关系,以及闲置期对反应周期的影响.实验结果表明,SBR工艺对处理水质、水量负荷变化很大的化粪池出水,是一种理想的工艺选择. 相似文献
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徐文缠 《安全.健康和环境》2006,6(1):18-20
利用故障树分析(FTA)对汽车槽车装车过程中引起的闪燃着火事件进行了分析,针对中转油站存在的安全隐患提出整改措施. 相似文献