微生物过滤法净化恶臭污染物

分析了处理恶臭污染物的吸附法、化学吸收法、催化燃烧法、生物处理法等优缺点 ,并介绍了微生物过滤器法净化恶臭物质的过程及工艺实例。     

中国医科大学附属第一医院综合废水处理及回用工程实践

中国医科大学附属第一医院 (简称中国医大一院 )建设综合污水处理及中水回用工程 ,提高了水的重复使用率 ,并将生产的中水回用至新病房大楼作为冲厕用水及院区景观绿化用水 ,在减少污水排放量的同时 ,取得了显著的环境效益和经济效益。     

高效沉淀装置处理后期雨水的试验研究

以悬浮物浓度、浊度、化学需氧量COD作为测试指标,通过小试对新型高效沉淀装置用于后期雨水的处理进行了研究。结果表明,混凝剂(PAC)和助凝剂(PAM)投加量分别为30 mg/L和1 mg/L时,对悬浮物SS、浊度和CODCr的平均去除效率分别达到了83.2%、76%和64.1%,出水水质达到了排放标准要求。     

固定化微生物-曝气生物滤池（IBAF）技术用于微污染水处理的实验研究

以温榆河微污染水为研究对象,采用人工草生物载体固定微生物,并在曝气生物滤池反应系统中对其进行处理。河流微污染水中N、P营养缺乏,有机物浓度较低,而且水质变化较大。在水力停留时间为10 h、8h、6.3 h、4.7 h时,此工艺对此河水的处理效果有较大的差异,说明水力停留时间的不同对污染物去除率的影响较大。     

Optimization of ecosystem model parameters using spatio-temporal soil moisture information

Parameters in process-based terrestrial ecosystem models are often nonlinearly related to the water flux to the atmosphere, and they also change temporally and spatially. Therefore, for estimating soil moisture, process-based terrestrial ecosystem models inevitably need to specify spatially and temporally variant model parameters. This study presents a two-stage data assimilation scheme (TSDA) to spatially and temporally optimize some key parameters of an ecosystem model which are closely related to soil moisture. At the first stage, a simplified ecosystem model, namely the Boreal Ecosystem Productivity Simulator (BEPS), is used to obtain the prior estimation of daily soil moisture. After the spatial distribution of 0–10 cm surface soil moisture is derived from remote sensing, an Ensemble Kalman Filter is used to minimize the difference between the remote sensing model results, through optimizing some model parameters spatially. At the second stage, BEPS is reinitialized using the optimized parameters to provide the updated model predictions of daily soil moisture. TSDA has been applied to an arid and semi-arid area of northwest China, and the performance of the model for estimating daily 0–10 cm soil moisture after parameter optimization was validated using field measurements. Results indicate that the TSDA developed in this study is robust and efficient in both temporal and spatial model parameter optimization. After performing the optimization, the correlation (r²) between model-predicted 0–10 cm soil moisture and field measurement increased from 0.66 to 0.75. It is demonstrated that spatial and temporal optimization of ecosystem model parameters can not only improve the model prediction of daily soil moisture but also help to understand the spatial and temporal variation of some key parameters in an ecosystem model and the corresponding ecological mechanisms controlling the variation.     

Assessment of the seismic effect of insulation on extra-large cryogenic liquid natural gas storage tanks

Insulation is typically used in extra-large double-walled cryogenic storage tanks that are used to store liquid natural gas (LNG). These vessels have been designed with the assumption that the insulation offers negligible structural resistance that might cause structural damage. Observation of the deformation of the insulation in such tanks leads to concern that the insulation may become sufficiently compacted to cause significant load transfer between the inner and outer tank. The inner tank, though protected from most external events by the outer tank, is only designed to contain the liquid gas. It is therefore much more sensitive to seismic effects. In this investigation, simplified and 3D finite element models are used to simulate the interaction effects of the fluid, inner tank, insulation and outer tank. This paper presents an initial analysis of the potential effects of LNG tank insulation under earthquake conditions and assesses the potential for structural damage by comparison of models that do or do not consider the insulation layer. The data reported and statistically sorted include the overturning moment, the base shear, the tank wall stress, and the wave height in the tank. The results show that the insulation layer has certain influence on seismic design of LNG tanks.     

大型常压储罐在用检验技术与策略

介绍了钢制立式焊接常压储罐主要的损伤机理、主要检测标准和各种无损检测方法在储罐检验中的应用特点以及基于风险检验的理念,提出了储罐在用检验的技术方法和策略。     

黄河微污染原水预处理新方法的实验研究

利用沸石—活性碳组合填料生物滤池对黄河兰州段微污染原水预处理效果进行了实验研究,结果表明:在水力停留时间为40min,气水比为1∶1,水温为25~30℃的实验条件下,对NH4-N、CODMn、UV254、浊度、锰的平均去除率分别为95.0%、32.68%、9.42%、70.1%、91.3%,预处理效果明显,且具有较强的抗冲击负荷能力。     

Filter badge SO_2捕集-离子色谱法测定空气中二氧化硫

用Filter badge SO2捕集空气中SO2。用双氧水将捕集到的SO2氧化成SO42-,再用离子色谱法测定SO42-的浓度,按公式f SO2=2082×103×(T/τ)X计算,即可得到捕集时间内的平均SO2浓度f SO2(ppb)。     

油田水处理系统过滤器性能分析

核桃壳过滤器是渤海曹妃甸油田生产水处理系统的关键设备,本文对其运行现状进行了全面分析,针对目前滤料再生困难和除油效率偏低等问题,采取了相应的改造措施,并对滤器的安装调试和日常维修保养给出了具体建议。可供石油石化行业类似设备操作与维修提供借鉴。